KR100919550B1 - Power storage system - Google Patents

Abstract

The present invention provides a power storage system that can reliably perform start-up, operation, and stop, which are important and indispensable in practical use, and can appropriately cope with various abnormalities.

A power storage system for adjusting a DC power from a DC power supply to a predetermined voltage and current by a DCDC converter, and storing the same in a power storage, comprising: a primary current detection unit on a DC power supply source side (primary side) of the DCDC converter; The primary side voltage detector, the primary side switch unit, and the primary side filter unit are arranged, and the secondary side filter unit, the secondary side switch unit, the secondary side voltage detector, and the secondary side current detector on the power storage side (secondary side) of the DCDC converter unit. At least the primary side switch unit, the DCDC converter unit and the secondary side switch unit are turned on by the system control unit to which the operation command from the outside and the signals obtained from the respective units such as the primary side current detector and the primary side voltage detector are input. , Off control was performed.

Description

Power Storage System {POWER STORAGE SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power storage system that stores and charges and discharges DC power, and is applicable to, for example, an electric vehicle.

In recent years, when a vehicle is braked by combining an electric power storage system such as a secondary battery or an electric double layer capacitor with a drive control inverter installed in an electric vehicle, a power supply installed in a substation on the ground, or the like. It is known that the kinetic energy possessed by the vehicle can be effectively used by storing the surplus regenerative power to be stored in the electric power storage device and using the stored power when the vehicle is accelerated or the line voltage is lowered (for example, a patent Document 1, Patent Document 2).

Patent Document 1: Japanese Patent Laid-Open No. 2003-199354

Patent Document 2: Japanese Patent Laid-Open No. 2005-206111

In the practical use of the electric power storage system, how to configure each part constituting the electric power storage system including an arrangement position, how to operate the respective parts under what conditions and how to operate the system, and how to detect them when an abnormality occurs in the system, As a result of detection, how to operate each unit is an important and indispensable technique for using the power storage system stably and safely.

However, the application development of the power storage system has only recently been started in recent years, and Patent Document 1 and Patent Document 2 describe the structure and operation of the power storage system. The specific operation method, the abnormality detection method, and the operating method in the case of detecting an abnormality are not shown.

BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the structural example of the electric power storage system in Embodiment 1 of this invention.

FIG. 2 is a diagram showing an example of the configuration of a DC power supply 1 (1) in the first embodiment of the present invention.

FIG. 3 is a diagram showing an example of the configuration of a blocking unit 8 according to the first embodiment. FIG.

FIG. 4 is a diagram showing a configuration example of the primary side current detection unit 10 according to the first embodiment.

FIG. 5 is a diagram showing a configuration example of the primary side voltage detection unit 20 according to the first embodiment.

FIG. 6 is a diagram showing a configuration example of the primary side switch unit 30 (1) in the first embodiment. FIG.

7 is a diagram illustrating a configuration example of a switch in Embodiments 1 to 7;

FIG. 8 is a diagram showing an example of the configuration of a primary filter portion 40 (1) according to the first embodiment.

FIG. 9 is a diagram showing a configuration example of the DCDC converter 50 (1) in the first embodiment.

10 is a diagram showing a configuration example of a converter circuit 51a according to the first embodiment.

FIG. 11 is a diagram showing an example of the configuration of the discharge circuit portion 45 (1) according to the first embodiment.

FIG. 12 is a diagram showing an example of the configuration of a secondary filter unit 60 (1) in Embodiment 1. FIG.

Fig. 13 is a diagram showing an example of the configuration of the secondary side switch section 70 (1) in the first embodiment.

FIG. 14 is a diagram showing an example of the configuration of a secondary voltage detection unit 80 according to the first embodiment.

FIG. 15 is a diagram showing a configuration example of the secondary side current detection unit 90 according to the first embodiment.

16 is a diagram showing an example of the configuration of the protection device 100 according to the first embodiment.

17 is a diagram showing a configuration example of the power storage unit 110 according to the first embodiment.

FIG. 18 is a diagram showing a configuration example of an electric power storage system according to the second embodiment; FIG.

19 is a diagram showing an example of the configuration of a DC power supply 1 (2) according to the second embodiment.

20 is a diagram showing an example of the configuration of a primary filter portion 40 (2) according to the second embodiment.

21 is a diagram showing a configuration example of an electric power storage system according to the third embodiment;

FIG. 22 is a diagram showing an example of the configuration of a discharge circuit portion 45 (2) in Embodiment 3. FIG.

FIG. 23 is a diagram showing an example of the configuration of an electric power storage system according to the fourth embodiment; FIG.

FIG. 24 is a diagram showing an example of the configuration of the primary side switch unit 30 (2) according to the fourth embodiment.

25 is a diagram showing a configuration example of an electric power storage system according to the fifth embodiment;

FIG. 26 is a diagram showing an example of the configuration of the secondary switch unit 70 (2) according to the fifth embodiment.

27 is a diagram showing a configuration example of an electric power storage system according to the sixth embodiment;

FIG. 28 is a diagram showing a configuration example of a DCDC converter 50 (2) according to the sixth embodiment.

29 is a diagram showing a configuration example of a converter circuit 51b according to the sixth embodiment.

30 is a diagram illustrating an example of the configuration of the discharge circuit portion 45 (3) in the sixth embodiment.

FIG. 31 is a diagram showing an example of the configuration of a secondary filter unit 60 (2) in Embodiment 6. FIG.

32 is a diagram showing an example of the configuration of an electric power storage system according to the seventh embodiment;

<Code description>

1: DC power

1a: DC voltage source

1b: line

1c: current collector

1d: switch

1e: reactor

1f: condenser

1g: Inverter

1h: electric motor or load

1i: rail

8: blocking part

8a: switch

10: primary current detector

11: current detector

12: current detector

20: primary voltage detection unit

21: voltage detector

30 (1) ~ 30 (2): Primary side switch

31a to 31b: switch

32: charge resistance

31a1: main contact

31a2: auxiliary contact

31a3: Input coil

40 (1) ~ 40 (2): Primary filter part

41: reactor

42: voltage detector

43: primary capacitor

44: noise filter

45 (1) to 45 (3): discharge circuit

46a: primary side diode

46b: secondary diode

46c, 46c1, 46c2: element for discharge

46d, 46d1, 46d2: element driving circuit for discharge

46e, 46e1, 46e2: discharge resistance

50 (1) ~ 50 (2): DCDC Converter

51a, 51b: converter circuit

52a, 52b: converter control unit

51a1 to 51a4: switching element

51b1 to 51b2: switching element

51a5: Combined Reactor

60 (1), 60 (2): Secondary filter part

61: reactor

62: voltage detector

63: secondary capacitor

64: noise filter

70 (1) ~ 70 (2): secondary side switch

71a to 71c: switch

72: charge resistance

80: secondary voltage detector

81: voltage detector

90: secondary current detector

91 ~ 93: current detector

100: protection device

101a, 101b: fuse

102a, 102b: auxiliary contacts

110: power storage unit

111: cell

112; Power storage monitor

200 (1) ~ 200 (7): power storage system

SUMMARY OF THE INVENTION In view of the above situation, the present invention provides a system capable of reliably starting, operating and stopping important and indispensable in the practical use of an electric power storage system, and capable of appropriately responding to various abnormalities. It is an object to provide a power storage system that is optimal for the application.

The present invention provides a power storage system in which a direct current power from a direct current power source is adjusted to a predetermined voltage and current by a DCDC converter unit and stored in a power storage unit, wherein the DC power supply side (primary side) Primary side current detection unit for detecting current in the circuit, primary side voltage detection unit for detecting the voltage of the main circuit, primary side switch unit for opening and closing the main circuit, and primary side filter unit for suppressing the high frequency of the main circuit At the same time, the secondary filter unit for suppressing the high frequency of the main circuit, the secondary switch unit for opening and closing the main circuit, the secondary side voltage for detecting the voltage of the main circuit to the power storage unit side (secondary side) of the DCDC converter unit. A detection unit and a secondary side current detection unit for detecting the current of the main circuit are disposed, the operation command from the outside, the primary current detection unit, the primary side voltage detection unit, the primary side switch unit, 1 At least the primary side switch unit, the DCDC, by a system controller to which signals obtained from the side filter unit, the DCDC converter unit, the secondary side filter unit, the secondary side switch unit, the secondary side voltage detector, the secondary side current detector, and the power storage unit are input. The on and off control of the converter section and the secondary switch section is performed.

Embodiment 1.

1 is a diagram showing a configuration example of a power storage system according to the first embodiment of the present invention.

As shown in FIG. 1, the power storage system 200 (1) is connected to a DC power supply 1 (1), and the power storage system 200 (1) includes a blocking unit having a current interrupting means ( 8) located at the rear end of the breaker 8 to detect the current of the primary side main circuit, and located at the rear end of the primary side current detector 10 and the primary side current detection unit 10 to detect the voltage of the primary side main circuit. Of the primary side switch unit 30 (1) and the primary side switch unit 30 (1), which are located at the rear end of the primary side voltage detector 20, the primary side voltage detector 20, Primary filter unit 40 (1) located at the rear end and suppressing high frequency of the primary circuit, DCDC converter unit 50 (1) located at the rear end of primary filter unit 40 (1), DCDC The positive side of the secondary side filter unit 60 (1) and the primary side filter unit 40 (1), which are located on the secondary side of the converter unit 50 (1) and suppress high frequencies of the secondary side main circuit. On the positive side of the negative and secondary filter 60 (1), Secondary side switch part 70 (1) and secondary side switch part 70 (1) which are located at the rear end of the discharge circuit part 45 (1) to be connected, the secondary side filter part 60 (1), and open / close the secondary side main circuit. 1)), the secondary side voltage detector 80 for detecting the voltage of the secondary main circuit and the secondary side current detector for detecting the current of the secondary main circuit located at the rear end of the secondary voltage detector 80. 90), the protection device unit 100 located at the rear end of the secondary current detection unit 90, the power storage unit 110 located at the rear end of the protection device unit 100, and the system control unit 120 (1) controlling them. It consists of)).

The system control unit 120 (1) outputs the input command S0 to the breaker 8, outputs the input commands S1 to S2 to the primary side switch unit 30 (1), and the DCDC converter unit 50 (1). ), The operation command S3 is output, the discharge command S4 is output to the discharge circuit part 45 (1), and the input commands S5 to S7 are output to the secondary side switch part 70 (1).

In addition, the system controller 120 (1) receives the auxiliary contact signal F0 from the breaker 8, receives the primary side current I1 and the primary side current I2 from the primary side current detector 10, and the primary side voltage. The primary side voltage V1 is input from the detector 20, the auxiliary contact signals F1 and F2 are inputted from the primary side switch unit 30 (1), and the primary capacitor voltage V2 is received from the primary side filter unit 40 (1). , The state signal F3 is input from the DCDC converter unit 50 (1), the state signal F4 is input from the discharge circuit unit 45 (1), and the secondary side is received from the secondary filter unit 60 (1). The capacitor voltage V3 is input, the auxiliary contact signals F5 to F7 are input from the secondary side switch unit 70 (1), the secondary side voltage V4 is input from the secondary side voltage detector 80, and the secondary side current detector 90 ), The secondary side current I3, the secondary side current I4, the secondary side current I5 are inputted, and the auxiliary contact signals F8 and F9 are inputted from the protection device 100. The state signal F10 is input from the power storage unit 110.

The operation command C1 is input to the system control unit 120 (1) from the outside.

Each of the above parts drives a switch built in the primary side switch unit or the secondary side switch unit from the outside, operates the DCDC converter, the discharge circuit, or is a computer incorporated in the system control unit or the converter control unit described below. It is a configuration that is supplied with a control power (not shown) for operating the.

Fig. 2 is a diagram showing a configuration example of the DC power supply 1 (1) of Embodiment 1 of the present invention.

As shown in FIG. 2, the DC power supply 1 (1) includes a current collector 1c and a rail 1i of a circuit including a DC voltage source 1a, a wire 1b, a current collector 1c, and a rail 1i. Is the voltage between

3 is a diagram showing an example of the configuration of the blocking unit 8 according to the first embodiment of the present invention.

As shown in FIG. 3, it consists of a switch 8a.

This switch 8a is a switch (so-called breaker) having a function of automatically cutting off a circuit even when no current is supplied from the outside when an overcurrent flows.

4 is a diagram showing an example of the configuration of the primary side current detection unit 10 according to the first embodiment of the present invention. It consists of the current detector 11 which detects primary side current I1, and the current detector 12 which detects the difference current I2 of a positive side and a negative side.

In both current detectors, for example, the configuration of detecting current by converting the magnetic flux generated by the current passing through the current detector into a current value is not limited thereto.

The positive side wiring and the negative side wiring penetrate the current detector 12 in a direction in which the current directions of each other are reversed. In the normal state of the circuit, since the positive side current and the negative side current have the same magnitude and different directions, the sum of the magnetic fluxes generated by the positive side current and the negative side current becomes zero, and the current detected by the current detector 12 becomes zero. . However, when a leakage current occurs due to insulation deterioration of the wiring or the like, part of the current flows through a device case made of metal other than the wiring, for example, so that the magnitudes of the positive side current and the negative side current are different, and the current detector 12 Since the sum of the magnetic flux generated by the positive side current and the negative side current passing through is not zero, the output I2 of the current detector 12 is not zero.

By monitoring the primary side difference current I2 in the system control unit 120 (1), the leakage current can be detected.

The leakage current is caused by the insulation deterioration of the wiring, so if it is not restored quickly, it may generate a short circuit or ground fault, but at a stage where a very small leakage current is generated, By detecting and inputting to the system control part 120 (1), and taking appropriate measures demonstrated below, short circuit and a ground fault can be avoided beforehand.

The primary side current I1 and primary side difference current I2 detected by the current detectors 11 and 12 are output to the system control unit 120 (1).

In addition, the primary side current detector 10 is disposed immediately after the breaker 8 (the front end of the primary side voltage detector 20), so that the differential current in the upstream of the circuit seen from the direct current source 1 (1) can be obtained. It becomes possible to detect, and can maximize the range of the circuit which can detect the leakage current which arises from the voltage of the DC power supply 1 (1).

5 is a diagram showing an example of the configuration of the primary side voltage detector 20 according to the first embodiment of the present invention. As shown in FIG. 5, the primary side voltage detector 20 includes a voltage detector 21 that detects a voltage between the positive side and the negative side. The detected primary side voltage V1 is output to the system control unit 120 (1).

FIG. 6 is a diagram showing a configuration example of the primary side switch unit 30 (1) of Embodiment 1 of the present invention.

As shown in FIG. 6, the primary side switch unit 30 (1) includes a switch 31 a disposed in series on the positive side, a switch 31 b disposed in parallel to the switch 31 a, and a charging resistor 32. It consists of a series circuit. Input signals S1 and S2 are input to the switches 31a and 31b, respectively, and auxiliary contact signals F1 and F2 (described below) are input to the system control unit 120 (1) from the switches 31a and 31b.

FIG. 7 is a diagram showing a configuration example of the switches 8a, 31a, 31b, 71a to 71c of the first embodiment of the present invention. In addition, the switches 71a to 71c will be described later.

As shown in FIG. 7, the main contact 31a1 which opens and closes a main circuit, the injection coil 31a3 which drives the main contact 31a1, and the main contact 31a1 are mechanically connected, and the main contact 31a1 is inputted. When the interlock is closed, and when opened, the auxiliary contact 31a2 opens in interlocking fashion.

The input coil 31a3 is an electromagnetic coil which is turned on and off according to the input instructions S0 to S2 and S5 to 57 input from the system control unit 120 (1), and the main contact 31a1 is inputted with or without the driving force of the coil. Open,

The auxiliary contacts, signals F0 to F2, F5 to F7, which illustrate the operation of the main contact 31a1, detected by the auxiliary contact 31a2, are output to the system control unit 120 (1).

In the above description, the switches 8a, 31a, 31b, 71a to 71c are mechanical switches. However, the switches 8a, 31a, 31b, 71a to 71c are mechanical switches, but are not limited thereto. It may be a contactless switch.

In addition, the auxiliary contact 31a2 is configured to be closed by interlocking when the main contact 31a1 is input, and is opened in interlocking manner when the main contact 31a1 is opened. You may make it.

By inputting the signal of the auxiliary contact which interlocks with the main contact in this way to the system control part 120 (1), it becomes possible to grasp | ascertain the operation | movement of a switch in a system control part reliably, as demonstrated below, and to start and operate reliably. In addition, a stop step can be established, and an abnormality in the switch can be detected.

FIG. 8 is a diagram showing a configuration example of the primary filter portion 40 (1) of Embodiment 1 of the present invention. As shown in FIG. 8, a voltage detector 42 is connected to the rear end of the reactor 41. The primary capacitor voltage V2 detected by the voltage detector 42 is output to the system control unit 120 (1).

The noise filter 44 is connected to the rear end of the voltage detector 42, and the primary capacitor 43 is connected to the rear end of the noise filter 44.

The noise filter 44 suppresses the outflow of noise to the outside by generating an impedance to noise components (common mode noise) flowing in the same direction through the wiring on the positive side and the wiring on the negative side, for example. The center of a ring-shaped core material made of ferrite or amorphous material can be realized by collectively penetrating the wiring on the positive side and the wiring on the negative side in a direction in which the current direction of each other is reversed.

In order to increase the impedance, it is preferable that the core material has a structure in which the positive wiring and the negative wiring are turned a plurality of times in the same direction.

This noise filter 44 is preferably provided at the front end of the primary capacitor 43 and near the primary capacitor 43.

By providing the noise filter 44 in this way, it becomes possible to obtain an electric power storage system with little noise leakage to the outside.

In addition, common mode noise is also obtained by connecting a circuit (not shown) formed by connecting two capacitors having high frequency characteristics in series to the primary capacitor 43 in parallel, and grounding the intermediate point of the series connection to the case. It is possible to suppress the outflow of oil. By using this together with the noise filter 44, it becomes possible to increase the effect which suppresses the outflow of common mode noise further.

In addition, when the voltage detector 42 is connected to the rear end of the noise filter 44, the noise filter 44 is connected to the rear end of the primary capacitor 43 in parallel, which will be described later. Since it acts as an impedance with respect to the common mode noise current generated from C, the common mode noise current flows into the system control unit 120 (1) through the voltage detector 42, the impedance of which is relatively small, and the system control unit 120 It may cause malfunction of (1)). By connecting the voltage detector 42 to the front of the noise filter 44, the common mode noise current generated from the DCDC converter 50 (1) flows into the system control unit 120 (1) through the voltage detector 42. It is possible to avoid causing a malfunction.

FIG. 9 is a diagram showing a configuration example of the DCDC converter section 50 (1) of Embodiment 1 of the present invention.

As shown in Fig. 9, the DCDC converter unit 50 (1) is composed of a converter circuit 51a and a converter control unit 52a, and an operation command S3 is transmitted from the system control unit 120 (1) to the converter control unit 51a. It inputs, and the state signal F3 is output from the converter control part 52a to the system control part 120 (1).

10 is a diagram illustrating an example of the configuration of the converter circuit 51a.

As shown in FIG. 10, it consists of the bidirectional buck-boost type DCDC converter circuit which consists of four switching elements 51a1-51a4 and the coupling reactor 51a5. This circuit is a circuit capable of bidirectional power flow control regardless of the magnitude of the primary side voltage (left terminal in the drawing) and the secondary side voltage (right terminal in the drawing) of the converter circuit.

This makes it possible to set the voltage of the power storage unit 110 higher than the voltage of the DC power supply 1a, and to reduce the current of the circuit after the DCDC converter unit 50 (1), As a result, the component can be miniaturized, whereby a compact and lightweight power storage system can be obtained.

As shown in Figs. 9 and 10, the converter controller 52a includes the operation, stop, control mode, power flowing between the primary side and the secondary side of the DCDC converter from the system control unit 120 (1), and the combined reactor current ILP ( Or ILN), the operation command S3 including the command value (target value) of the converter primary side current I1P (or I1N), the converter secondary side current I2P (or I2N), the primary capacitor voltage V2, and the secondary capacitor voltage V3 is input. The state signal F3 of the DCDC converter 50 (1) is input from the converter controller 52a to the system controller 120 (1).

The status signal F3 is a status signal including the respective negative voltages, currents, temperatures, switching elements on and off states, and fault conditions of the DCDC converter 50 (1). Based on the operation command S3, the converter control unit 52a PWM-controls the switching elements 51a1 to 51a4 of the converter circuit 51a.

FIG. 11 is a diagram showing a configuration example of the discharge circuit portion 45 (1) of Embodiment 1 of the present invention.

As shown in Fig. 11, the primary diode 46a is connected to the wiring drawn from the positive side of the rear end of the primary filter portion 40 (1), and the positive side of the front end of the secondary filter portion 60 (1). The secondary side diode 46b is connected to the wiring drawn from the side, and the cathodes of both diodes are collided, and the positive side of the circuit connecting the discharge element 46c and the discharge resistor 46e in series at the collision point is connected. This configuration is for connecting the negative side to the negative side wiring.

The discharge element 46c is controlled on and off by the discharge element drive circuit 46d. The discharge command S4 including the on / off command of the discharge element 46c is input from the system control unit 120 (1) to the discharge element drive circuit 46d, and the system control unit is received from the discharge element drive circuit 46d. The state signal F4 including the operation state of the discharging element 46c is input to the 120 (1).

Thus, by discharging the primary side diode 46a and the secondary side diode 46b, it is possible to discharge the charges of the primary side capacitor 43 and the secondary side capacitor 63 to one discharge element 46c. Since it becomes possible, a small and lightweight discharge circuit part is obtained.

Fig. 12 is a diagram showing an example of the configuration of the secondary filter 60 (1) of Embodiment 1 of the present invention.

As shown in FIG. 12, the noise filter 64 is connected to the rear end of the secondary side capacitor 63, and the voltage detector 62 which detects the secondary side capacitor voltage V3 is connected to the rear end. The signal V3 detected by the voltage detector 62 is output to the system controller 120. The reactor 61 is connected to the rear end of the voltage detector 62.

Since the structure of the noise filter 64 is the same as the said noise filter 44, it abbreviate | omits. This noise filter 64 is preferably provided at the rear end of the secondary capacitor 63 and near the secondary capacitor 63.

In addition, common mode noise can also be obtained by connecting a circuit (not shown) formed by connecting two capacitors having high frequency characteristics in series to the secondary capacitor 63 in parallel, and grounding the intermediate point of the series connection to the case. It is possible to suppress the outflow of oil. By using this together with the noise filter 64, it becomes possible to increase the effect which suppresses the outflow of common mode noise further.

The reactor 61 is provided to reduce ripple current generated in the DCDC converter unit 50 (1).

Further, when the voltage detector 62 is connected to the front end of the noise filter 64, the noise filter 64 is common mode noise generated from the DCDC converter 50 (1) connected in parallel to the capacitor 63. Since it acts as an impedance to the current, the common mode noise current flows into the system control unit 120 (1) through the voltage detector 62, which has a relatively small impedance, thereby preventing malfunction of the system control unit 120 (1). It may be caused. By connecting the voltage detector 62 to the rear end of the noise filter 64, the common mode noise current generated from the DCDC converter 50 (1) flows into the system control unit 120 (1) through the voltage detector 62. Thus, it is possible to avoid causing a malfunction.

Fig. 13 is a diagram showing an example of the configuration of the secondary side switch section 70 (1) of Embodiment 1 of the present invention.

As shown in Fig. 13, the primary side switch unit 70 (1) is composed of a switch 71a arranged in series on the positive side, a switch 71b connected in parallel thereto, and a charge resistor 72. And a switch 71c arranged in series on the negative side.

Input signals S5 to S7 are input to the switches 71a to 71c from the system control unit 120 (1), respectively, and auxiliary contact signals F5 to F7 showing the operation from the switches 71a to 71c are supplied to the system control unit 120 ( It is configured as input to 1)).

Since the internal structure of the switches 71a-71c is the same as that shown in FIG. 7, description is abbreviate | omitted.

In addition, although the switches 71a-71c are shown as a mechanical switch, if the structure which can open and close a circuit and check the operation | movement is not limited to this, it may be a semiconductor type contactless switch, for example.

FIG. 14 is a diagram showing an example of the configuration of the secondary side voltage detector 80 of Embodiment 1 of the present invention. As shown in Fig. 14, the secondary side voltage detector 80 is constituted by a voltage detector 81 for detecting the secondary side voltage V4. The detected signal V4 is configured to be output to the system control unit 120 (1).

FIG. 15 is a diagram showing an example of the configuration of the secondary side current detection unit 90 according to the first embodiment of the present invention. As shown in Fig. 15, the current detector 91 for detecting the secondary side current I3 on the positive side, the current detector 92 for detecting the differential current I4 on the positive side and negative side, and the current detector for detecting the secondary side current I5 on the negative side ( 93).

It operates by converting the magnetic flux generated by the current passing through all current detectors, for example, the current detector, into a current value.

The current detector 92 is for detecting leakage current due to insulation degradation of a circuit, and the details thereof are the same as those of the current detector 12, and thus description thereof is omitted.

Further, the secondary side current detection unit 90 is disposed immediately before the protection device unit 100 (the rear end of the secondary side voltage detection unit 80) to detect the difference current near the power storage unit 110. It becomes possible to detect the difference current upstream of the circuit from the power storage unit 110, the range of the circuit that can detect the leakage current generated by the voltage of the power storage unit 110 You can do it at maximum.

The secondary side positive side current I3, the secondary side differential current I4, and the secondary side negative side current I5 detected by the current detectors 91 to 93 are configured to be output to the system control unit 120 (1).

The same effect can also be obtained by omitting the current detector 92 and inputting only the signals I3 and I5 of the current detectors 91 and 92 to the system control unit 120 (1) to calculate the difference between the two signals and evaluate it. Can be obtained.

16 is a diagram showing an example of the configuration of the protection device 100 according to the first embodiment of the present invention.

As shown in Fig. 16, the positive fuse 101a and the negative fuse 101b have a function of melting and opening a circuit when an overcurrent flows. Each has the auxiliary contact 102a, 102b which detects melt | fusing by closing a contact when a fuse blows.

The auxiliary contact signals F8 and F9 showing the states of the auxiliary contacts 102a and 102b are configured to be output to the system control unit 120 (1).

In addition, when the fuses 101a and 101b are blown, the blowdown may be detected by opening the contact, and the auxiliary contact may be replaced by a detection circuit composed of an electronic circuit even if it is not a mechanical contact.

Instead of the fuse, a switch (so-called breaker) having a function of automatically interrupting the circuit even when there is no command from the outside when an overcurrent flows may be used.

By installing a fuse on the negative side as well as on the positive side, the circuit can be interrupted even when the connection point between the negative side wiring at the front end of the fuse 101b and the cells 111 in the power storage unit 110 is shorted. As a result, it is possible to obtain a power storage system with more protection.

FIG. 17 is a diagram showing a configuration example of the power storage unit 110 according to the first embodiment of the present invention.

As shown in Fig. 17, a plurality of cells 111 composed of an electric double layer capacitor or a secondary battery are arranged in series and in parallel so as to obtain necessary voltages and capacitances between terminals of the power storage unit.

Information such as each sub-voltage, current, accumulated power amount, temperature, pressure, etc. of the cell 111 or the power storage unit 110 is collected by the power storage unit monitor 112, and the system control unit 120 ( 1)) is configured to be output.

Next, the operation steps from the start of the electric power storage system 200 (1) in the configuration shown in the first embodiment to the stop through normal operation will be described.

In addition, as a startup method of this electric power storage system, when the primary side capacitor 43 or the secondary side capacitor 63 is charged from the DC power supply 1a, and started and operated (hereinafter, this starting method is called primary side startup). And the primary side capacitor 43 or the secondary side capacitor 63 by using the energy stored in the electric power storage unit 110, and starting and operating (hereinafter, the starting method is 2). Car side maneuver).

In the following, first, an operation step in the case of the primary side startup, and then an operation step in the case of the secondary side startup will be described.

For primary side start:

(Steps 1A-1)

When the control power supply of the system control unit 120 (1) is turned on, and the operation command C1 including the start command is input from the outside, the input command S0 of the switch 8a is outputted to close the coil 31a3 of the switch 8a. Exciting, and the main contact 31a1 is inserted.

In the stage where the input instruction S0 is on and the state where the auxiliary contact signal F0 of the switch 8a is securely closed and the auxiliary contact signal F0 is turned on at any time, the system control unit 120 (1) normally operates. It is recognized that the switch 8a could be turned on.

(Steps 2A-1)

The system control unit 120 (1) recognizes the normal closing of the switch 8a, and when the state where the primary side voltage V1 detected by the voltage detector 21 becomes higher than or equal to the set value continues for a certain period of time, the closing instruction S2 is output, the coil 31a3 of the switch 31b is excited, and the main contact 31a1 is put in. As a result, the primary capacitor 43 is charged via the charging resistor 32.

The system control unit 120 (1) switches the input command S2 on, and the auxiliary contact 31a2 of the switch 31b is reliably closed so that the auxiliary contact signal F2 is turned on for a certain period of time. Recognizing that 31b can be normally input, after a certain time has elapsed or the difference between the primary side voltage V1 and the primary capacitor voltage V2 becomes less than or equal to the set value, and after the predetermined time has elapsed, the primary capacitor 43 It is determined that the charging is completed, and the injection command S1 is output. Thereby, the coil 31a3 of the switch 31a is excited, and the main contact 31a1 is thrown in.

The system control part 120 (1) can normally input the switch 31a in the stage in which the auxiliary contact signal 21 of the switch 31a was surely closed, and the auxiliary contact signal F1 was turned on at any time. Recognize that it was.

(Steps 3A-1)

When the system controller 120 (1) confirms that the switch 31a is normally input, the system controller 120 (1) outputs an operation command S3 to the converter controller 52a. At this time, S3 is a command for operating the DCDC converter 50 (1) in the initial charging mode to charge the secondary capacitor 63, and a signal including the secondary capacitor voltage V3 and the secondary voltage V4. The converter control section 52a, upon receiving this operation command S3, controls the converter circuit 51a so that the secondary capacitor voltage V3 is equal to the secondary voltage V4, and passes the necessary power from the primary side of the converter to the secondary side. To charge the secondary capacitor (63).

At this time, in order not to damage the secondary capacitor 63 or the like due to rapid charging, the converter controller 52a controls the current of the converter circuit 51a so as to limit the current flowing from the primary side to the secondary value to a set value. The vehicle side capacitor 63 is configured to be charged.

The system control unit 120 (1) determines that the difference between the secondary capacitor voltage V3 and the secondary voltage V4 is within the set value, and after the set time has elapsed, the charging of the secondary capacitor 63 is completed.

(Steps 4A-1)

When the system control unit 120 (1) determines that the charging of the secondary capacitor 63 has been completed, the system control unit 120 (1) turns on the input instructions S5 and S7 for inputting the switches 71a and 71c. Thereby, the input coil 31a3 of each of the switches 71a and 71c is driven, and the main contact 31a1 is input. As a result, the auxiliary contact 31a2 interlocked with the main contact 31a1 is closed, and the auxiliary contact signals F5 and F7 indicating the state of each auxiliary contact 31a2 are output to the system control unit 120 (1).

The system control part 120 (1) has input instruction S5, S7 turned on, and the auxiliary contact signal 31a2 of switch 71a, 71c is reliably closed, and the state which the auxiliary contact signal F5, F7 turned on for arbitrary time turns on. In the subsequent step, it is recognized that the input of the switches 71a and 71c has been completed normally.

In addition, the switches 71a and 71c may be thrown in simultaneously, or may be put in order. By sequentially feeding in, the peak power required for feeding can be reduced, and only the switch to be put in last can be used as a switch capable of opening and closing the current. In general, a switch capable of opening and closing a current becomes large, but since the number of uses can be reduced, a small, lightweight power storage system can be obtained.

(Steps 5A-1)

When the system controller 120 (1) determines that the inputs of the switches 71a and 71c are completed normally, the converter controller 52a maintains the current ILP (or ILN on the negative side) of the coupling reactor 51a5 at zero. The operation command S3 is outputted so as to operate the controller.

As a result, the converter control section 52a controls the converter circuit 51a so that the current ILP (or ILN on the negative side) of the coupling reactor 51a5 becomes zero.

Further, the control primary current I1P (or I1N) may be controlled to be zero, or the control secondary current I2P (or I2N) may be controlled to be zero, and the primary side current I1 and current detected by the current detector 11 may be controlled. You may control so that the secondary side positive current I3 detected by the detector 91 may become zero. In addition, you may drive so that the secondary side side current I5 which is a detection value of the current detector 93 may become zero instead of the current detector 91.

The system controller 120 (1) determines that the converter controller 52a is normal when the state in which the detected value of the current to be controlled is equal to or lower than the set value continues for a predetermined time.

(Steps 6A-1)

The system control unit 120 (1) determines that the converter control unit 52a is normal, and then inputs the operation command S3 including the current command I * or the power command P * to the converter control unit 52a.

As a result, the converter control section 52a controls the current or the electric power between the primary side and the secondary side to match the command.

The current to be controlled is any one of the current ILP (or negative ILN) of the coupling reactor 51a5, the converter primary side current I1P (or I1N), and the converter secondary side current I2P (or I2N).

In addition, the operation command S3 including the voltage command V * may be input from the system control unit 120 (1) to the converter control unit 52a. In this case, the converter control unit 52a uses the primary side capacitor voltage V2 or the secondary side capacitor. The converter circuit 51a is controlled so that the voltage on the side indicated by any of the voltages V3 matches the voltage command V *.

(Steps 7A-1)

When the operation command C1 including the stop command is input from the outside, the system control unit 120 (1) inputs the operation command S3 to the converter control unit 52a to reduce the current of the converter to zero.

The converter control section 52a controls the converter circuit 51a so as to gradually reduce the current to finally become zero.

The time until the current is reduced to zero shall be arbitrarily set.

If the state where the current has fallen below the set value continues for a certain time, the system control unit 120 (1) inputs the operation command S3 to stop the DCDC converter 50 (1), and the converter control unit 52a switches. The elements 51a1 to 51a4 are turned off, and this is output to the state signal F3. The system control unit 120 (1) checks the state signal F3 and confirms that the DCDC converter 50 (1) has normally stopped.

The current to be controlled is any one of the current ILP (or negative ILN) of the coupling reactor 51a5, the converter primary side current I1P (or I1N), and the converter secondary side current I2P (or I2N).

By reducing the current to zero in this manner and then turning off the switching elements 51a1 to 51a4, it is possible to prevent the primary side capacitor voltage V2 or the secondary side capacitor voltage V3 from suddenly changing to become an overvoltage or the like.

(Steps 8A-1)

When the system control unit 120 (1) confirms that the DCDC converter 50 (1) has stopped normally, the input commands S0, S1, S2, S5 to open the switches 8a, 31a, 31b, 71a to 71c. Turn off S7.

The system control unit 120 (1) checks the auxiliary contact signals F0 to F2, F5 to F7 showing the states of the respective auxiliary contacts 31a2 of the switches 8a, 31a, 31b, 71a to 71c, and reliably. If it is confirmed that it is off, it is determined that the switches 8a, 31a, 31b, 71a to 71c are normally opened.

In this way, by confirming the stop of the DCDC converter 50 (1) and opening the switches 8a, 31a, 31b, 71a to 71c, opening the switches 8a, 31a, 31b, 71a to 71c without current. This makes it possible to avoid electrical wear of the main contacts of the switches 8a, 31a, 31b, 71a to 71c.

For secondary side start:

(Step 1B-1)

When the control power of the system control unit 120 (1) is turned on and the command C1 including the start command is input from the outside, the system control unit 120 (1) monitors the power storage unit 112 of the power storage unit 110. Checks the state signal F10 from), and when no abnormality has occurred and the state where the secondary voltage V4 detected by the voltage detector 81 is equal to or greater than the set value continues for a certain time, the switches 71b and 71c are turned on. Turn on commands S6 and S7. Thereby, the input coil 31a3 of each of the switches 71b and 71c is driven, and the main contact 31a1 is input. As a result, the auxiliary contact 31a2 interlocked with the main contact 31a1 is closed, and the auxiliary contact signals F6 and F7 indicating the state of each auxiliary contact 31a2 are output to the system control unit 120 (1).

The system control part 120 (1) has input instruction S6 and S7 turned on, and the auxiliary contact signal 31a2 of switch 71b and 71c is reliably closed, and the state which the auxiliary contact signal F6 and F7 turned on for arbitrary time is carried out. In the subsequent step, it is recognized that the input of the switches 71b and 71c has been completed normally.

In addition, the switches 71b and 71c may be thrown in simultaneously, or may be put in order. By sequentially feeding in, the peak power required for feeding can be reduced, and since a control power supply having a small peak content is sufficient, it is possible to obtain a compact and lightweight power storage system.

When the switches 71b and 71c are input, the secondary capacitor 63 is charged through the charging resistor 72.

After the system control unit 120 (1) recognizes that the inputs of the switches 71b and 71c have been completed normally, the state continues for an arbitrary time, or the difference between the secondary voltage V4 and the secondary capacitor voltage V3 is set. It becomes less than a value, and after a fixed time elapses, it is determined that charging of the secondary side capacitor 63 is completed, and outputs | insertion instruction S5. Thereby, the coil 31a3 of the switch 71a is excited, and the main contact 31a1 is thrown in.

The system control part 120 (1) can normally input the switch 71a in the stage in which the auxiliary contact signal 31 of the switch 71a was surely closed, and the auxiliary contact signal F5 was turned on for an arbitrary time. Recognize that it was.

(Step 2B-1)

When the system controller 120 (1) confirms that the switch 71a is normally input, the system controller 120 (1) outputs an operation command S3 to the converter controller 52a. At this time, S3 is a command for operating the DCDC converter 50 (1) in the initial charging mode to charge the primary capacitor 43, and a signal including the primary capacitor voltage V2 and the primary voltage V1. When the converter control unit 52a receives this operation command S3, the converter circuit 51a is operated to charge the primary capacitor 43 by passing the necessary power from the secondary side to the primary side.

At this time, in order not to damage the primary capacitor 43 or the like due to rapid charging, the converter controller 52a controls the current of the converter circuit 51a to limit the current flowing from the secondary side to the set value, The primary side capacitor 43 is charged.

The converter control section 52a controls the converter circuit 51a so that the primary capacitor voltage V2 is equal to the primary voltage V1 or that the primary capacitor voltage V2 is equal to a predetermined set value.

When the difference between the primary capacitor voltage V2 and the primary voltage V1 is within the set value, the system controller 120 (1) has a predetermined time, or when the primary capacitor voltage V2 reaches a predetermined set value, It is determined that charging of the primary capacitor 43 is completed.

(Step 3B-1)

When the system control unit 120 (1) determines that the charging of the primary capacitor 43 has been completed, the system control unit 120 (1) turns on the injection instruction S1 for inputting the switch 31a. Thereby, the injection coil 31a3 of the switch 31a is driven, and the main contact 31a1 is thrown in. As a result, the auxiliary contact 31a2 interlocked with the main contact 31a1 is closed, and the auxiliary contact signal F1 indicating the state of each auxiliary contact 31a2 is output to the system control unit 120 (1).

The system control unit 120 (1) switches the input command S1 on, and at the stage where the auxiliary contact signal F1 is turned on reliably and the auxiliary contact signal F1 is turned on for an arbitrary time, the switch It is recognized that the input of 31a is completed normally.

(Step 4B-1)

After recognizing the normal closing of the switch 31a, the system control unit 120 (1) outputs the closing command S0 of the switch 8a to excite the coil 31a3 of the switch 8a, and the main contact 31a1. ). In the stage where the input instruction S0 is on, and the condition that the auxiliary contact signal 31 is turned on securely by the closing of the auxiliary contact 31a2 of the switch 8a is continued for an arbitrary time, the system control unit 120 (1) normally operates. It is recognized that the switch 8a could be turned on.

(Step 5B-1)

When the system controller 120 (1) determines that the input of the switch 8a has been normally completed, the system controller 120 (1) causes the converter controller 52a to operate with the current ILP (or ILN on the negative side) of the coupling reactor 51a5 set to zero. Outputs the run command S3.

As a result, the converter control section 52a controls the converter circuit 51a so that the current ILP (or ILN on the negative side) of the coupling reactor 51a5 becomes zero.

Further, the control primary current I1P (or I1N) may be controlled to be zero, or the control secondary current I2P (or I2N) may be controlled to be zero, and the primary side current I1 and current detected by the current detector 11 may be controlled. You may control so that the secondary side positive current I3 detected by the detector 91 may become zero.

In addition, you may drive so that the secondary side side current I5 which is a detection value of the current detector 93 may become zero instead of the secondary side positive side current I3.

The system controller 120 (1) determines that the converter controller 52a is normal when the state in which the detected value of the current to be controlled is equal to or lower than the set value continues for a predetermined time.

(Step 6B-1)

The system control unit 120 (1) determines that the converter control unit 52a is normal, and then inputs the operation command S3 including the current command I * or the power command P * to the converter control unit 52a.

As a result, the converter control section 52a controls the current or the electric power between the primary side and the secondary side to match the command.

The current to be controlled is any one of the current ILP (or negative ILN) of the coupling reactor 51a5, the converter primary side current I1P (or I1N), and the converter secondary side current I2P (or I2N).

In addition, the operation command S3 including the voltage command V * may be input from the system control unit 120 (1) to the converter control unit 52a. In this case, the converter control unit 52a uses the primary side capacitor voltage V2 or the secondary side capacitor. The converter circuit 51a is controlled so that the voltage of the side indicated by any one of the voltages V3 equals to the voltage command V *.

(Step 7B-1)

When the operation command C1 including the stop command is input from the outside, the system control unit 120 (1) inputs the operation command S3 to the converter control unit 52a to gradually reduce the current of the converter to zero.

The converter control section 52a controls the converter circuit 51a to gradually reduce the current to finally zero. The time until the current is reduced to zero shall be arbitrarily set. If the state where the current has fallen below the set value continues for a certain time, the system control unit 120 (1) inputs the operation command S3 to stop the DCDC converter 50 (1), and the converter control unit 52a switches. The elements 51a1 to 51a4 are turned off, and this is output to the state signal F3. The system control unit 120 (1) checks the state signal F3 and confirms that the DCDC converter 50 (1) has normally stopped.

The current to be controlled is any one of the current ILP (or negative ILN) of the coupling reactor 51a5, the converter primary side current I1P (or I1N), and the converter secondary side current I2P (or I2N).

By reducing the current to zero in this manner, the switching elements 51a1 to 51a4 are turned off, whereby the primary side capacitor voltage V2 or the secondary side capacitor V3 suddenly changes to prevent overvoltage or the like.

(Step 8B-1)

When the system control unit 120 (1) confirms that the DCDC converter 50 (1) has stopped normally, the input commands S0 to S2, S5 to S7 to open the switches 8a, 31a, 31b, 71a to 71c. Off.

The system control unit 120 (1) checks the auxiliary contact signals F0 to F2, F5 to F7 indicating the state of each of the auxiliary contacts 31a2 of the switches 8a, 31a, 31b, 71a to 71c, and reliably turns it off. If it is confirmed that it is, it is determined that the switches 8a, 31a, 31b, 71a to 71c are normally opened.

In this way, by confirming the stop of the DCDC converter 50 (1) and opening the switches 8a, 31a, 31b, 71a to 71c, opening the switches 8a, 31a, 31b, 71a to 71c without current. This makes it possible to avoid electrical wear of the main contacts of the switches 8a, 31a, 31b, 71a to 71c.

By the operation steps from the above start to the stop through the normal operation, it is possible to obtain a power storage system with reliable operation.

In addition, when only the operation by primary side starting is performed, the switch 71b and the charging resistor 72 of the secondary side switch part 70 (1) are unnecessary and may be deleted.

When only the operation by the secondary side startup is performed, the switch 31b and the charging resistor 32 of the primary side switch unit 30 (1) are unnecessary and may be deleted.

Next, a detailed method of detecting abnormality of the power storage system shown in Embodiment 1 and an operation when an abnormality is detected will be described.

In order to operate the electric power storage system stably and safely, it is necessary to take appropriate measures promptly according to the kind of anomalies when an error occurs in each part of the electric power storage system. Therefore, since it becomes important to determine what kind of measures are taken in accordance with the above-described detection method and the above-mentioned kinds, it will be described below.

(Fault detection 1-1) Differential current error detection

The system control unit 120 (1) is any of the circuits in the case where the state of the primary side difference current I2 and the secondary side current I4, which are outputs of the current detectors 12 and 92, is not lower than or equal to a set value for a certain period of time. It is determined that an increase in leakage current due to insulation degradation or the like occurs at one place, and the input signals S0 to S2 and S5 to S7 of the switches 8a, 31a, 31b, 71a to 71c are turned off, and the DCDC converter 50 (1 The switching elements 51a1 to 51a4 are turned off, and the discharge command S4 is input to the discharge circuit portion 45 (1) to discharge the charges of the primary capacitor 43 and the secondary capacitor 63.

By operating as described above, the increase in the leakage current can be detected, the power storage system can be stopped quickly, and the expansion of the damage can be avoided.

In addition, when the set value is configured in a plurality of stages and the current difference is sufficiently small, the power storage system does not stop, and a recording device (not shown) or an indicator light (not shown) installed in the system control unit or the device, the driver's seat, or the like is shown. May be configured to prompt inspection.

(Fault detection 2-1) Switch error detection

Although the system control unit 120 (1) turns on the input command S0 of the switch 8a, the main contact 31a1 is not inputted due to a failure of the input coil 31a3 of the switch 8a, and the auxiliary contact ( If the state in which 31a2) is not closed and the auxiliary contact signal F0 is not turned on for a certain time continues, the auxiliary contact 31a2 is turned on while the input command S0 is turned off, and the auxiliary contact signal F0 is turned on. When the state which has been made continues for a certain time, the system control unit 120 (1) considers the abnormality of the switch 8a.

In addition, abnormality detection is performed also about switches 31a, 31b, 71a-71c. When an abnormality is detected in any of the switches 8a, 31a, 31b, 71a to 71c, the system control unit 120 (1) inputs S0 to S2 of all the switches 8a, 31a, 31b, 71a to 71c. , S5 to S7 are turned off, the switching elements 51a1 to 51a4 of the DCDC converter 50 (1) are turned off, the open command S4 is input to the discharge circuit portion 45 (1), and the primary capacitor 43 The electric charges of the secondary capacitor 63 are discharged.

By operating as described above, the failure of the switch can be detected, the power saving system can be stopped quickly, and the expansion of damage can be avoided.

(Fault detection 3-1) Detection of abnormal charging of the primary side capacitor (when starting the primary side)

The system control unit 120 (1) recognizes that the switch 31b is normally input in the above-mentioned (steps 2A-1) at the time of the primary side startup, and then even after a certain time has elapsed, the primary side voltage V1 and the primary side capacitor. When the difference from the voltage V2 is equal to or greater than the set value, or when the primary current I1 flows by the set value or more, it is determined that charging cannot be completed due to an abnormality such as a ground fault of the primary capacitor 43, and the switch 8a inserted until then. , The input commands S0 to S2 of 31a and 31b are turned off, and the discharge command S4 is input to the discharge circuit portion 45 (1) to discharge the electric charges of the primary capacitor 43.

By operating as mentioned above, abnormality of the charging circuit of the primary side capacitor 43 can be detected, a power storage system can be stopped quickly, and escalation of damage can be avoided.

(Fault detection 4-1) Detection of secondary capacitor charging failure (when starting the primary side)

The system control unit 120 (1), in the above-mentioned (steps 3A-1) at the time of primary side startup, does not complete the charging of the secondary side capacitor 63 within the set time, or from the converter control unit 52a. When a status signal F3 indicating a failure of the signal has been received, it is regarded as an abnormality around the DCDC converter 50 (1) or the secondary capacitor 63, and the input command S0 of the switches 8a, 31a, and 31b that have been inserted up to that time is received. ˜S2 is turned off, the switching elements 51a1 to 51a4 of the DCDC converter 50 (1) are stopped, the discharge command S4 is input to the discharge circuit portion 45 (1), and the primary capacitor 43, 2 The electric charge of the secondary side capacitor 63 is discharged.

By operating as mentioned above, abnormality of the charging circuit of the secondary side capacitor 63 can be detected, a power storage system can be stopped quickly, and escalation of damage can be avoided.

(Fault detection 5-1) Detection of secondary capacitor charging failure (at secondary side start)

The system control unit 120 (1) recognizes that the switches 71b and 71c are normally turned on in the above-mentioned (step 1B-1) at the time of the secondary side startup, and then the secondary voltage V4 and When the difference from the secondary capacitor voltage V3 is equal to or higher than the set value, or when the secondary positive side current I3 and the secondary side current I4 flow more than the set value, the secondary capacitor 63 may fail to complete charging. Judgment is made, and the input commands S6 and S7 of the switches 71b and 71c which have been put so far are turned off, the discharge command S4 is input to the discharge circuit section 45 (1), and the electric charges of the secondary capacitor 63 are discharged. .

By operating as mentioned above, abnormality of the charging circuit of the secondary side capacitor 63 can be detected, a power storage system can be stopped quickly, and escalation of damage can be avoided.

(Fault detection 6-1) Detection of primary capacitor charging failure (at secondary side startup)

The system control part 120 (1) is a converter from the converter control part 52a, when the charging of the primary side capacitor 43 is not completed within the set time in the above-mentioned (step 2B-1) at the time of secondary side start-up. When the status signal F3 indicating a failure of the signal has been received, it is regarded as an abnormality around the DCDC converter 50 (1) or the primary capacitor 43, and the instruction S6 and S7 for the switches 71b and 71c supplied until then are considered. OFF, the switching elements 51a1 to 51a4 of the DCDC converter 50 (1) are stopped, the discharge command S4 is input to the discharge circuit portion 45 (1), and the primary side capacitor 43 and the secondary side capacitor are The electric charge of 63 is discharged.

By operating as mentioned above, abnormality of the charging circuit of the primary side capacitor 43 can be detected, a power storage system can be stopped quickly, and escalation of damage can be avoided.

(Fault detection 7-1) Primary capacitor overvoltage detection

The system controller 120 (1) stops the switching elements 51a1 to 51a4 of the DCDC converter 50 (1) when the primary capacitor voltage V2 detected by the voltage detector 42 exceeds a predetermined value. , The input commands S1, S2, S5 and S7 of the switches 31a, 31b, 71a to 71c are turned off, and the discharge command S4 is input to the discharge circuit portion 45 (1), and the primary side capacitor 43 and the secondary side are The electric charge of the capacitor 63 is discharged.

By operating as described above, the overvoltage of the primary capacitor voltage V2 can be detected, the power storage system can be stopped quickly, and the damage can be avoided.

(Fault detection 8-1) Secondary capacitor overvoltage detection

The system controller 120 (1) stops the switching elements 51a1 to 51a4 of the DCDC converter 50 (1) when the secondary side capacitor voltage V3 detected by the voltage detector 62 exceeds an arbitrary setting value. To turn off the input commands S1, S2, S5 to S7 of the switches 31a, 31b, 71a to 71c, input the discharge command S4 to the discharge circuit section 45 (1), and input the primary capacitors 43 and 2 The electric charge of the secondary side capacitor 63 is discharged.

By operating as mentioned above, the overvoltage of the secondary side capacitor voltage V3 can be detected, a power storage system can be stopped quickly, and escalation of damage can be avoided.

(Fault detection 9-1) DCDC converter overcurrent detection

The system control unit 120 (1) turns off the switching elements 51a1 to 51a4 of the DCDC converter 50 (1) when the current of the switching elements 51a1 to 51a4 of the converter circuit 51a is greater than or equal to a predetermined set value. Let's do it.

The switching elements 51a1 to 51a4 may be turned off when the current ILP of the coupling reactor 51a5 or the current ILN on the negative side is greater than or equal to a predetermined value instead of the currents of the switching elements 51a1 to 51a4.

In addition, the input instructions S1, S2, S5 and S7 of the switches 31a, 31b, 71a to 71c are not turned off, and the discharge command S4 is not input to the discharge circuit section 45 (1), and the primary capacitor 43 is supplied. The charge of the secondary side capacitor 63 does not discharge.

The reason for only turning off the switching elements 51a1 to 51a4 without discharging the charge of the capacitor is that the overcurrent of the DCDC converter is temporarily disturbed due to a sudden change in the primary capacitor voltage V2 or the secondary capacitor voltage V3. This is a possible phenomenon, which is not an abnormality of the DCDC converter itself, and it is less likely to damage the DCDC converter.

By operating as mentioned above, the overcurrent of a DCDC converter can be detected, a power storage system can be stopped quickly, and escalation of damage can be avoided.

In addition, it is possible to shorten the time required for restarting by charging the capacitor again.

(Fault detection 10-1) DCDC converter temperature error detection

The system controller 120 (1) has a surface temperature of the switching elements 51a1 to 51a4 of the converter circuit 51a or a temperature of a cooling fin (not shown) to which the switching elements 51a1 to 51a4 are mounted. When it is more than the set value, the switching elements 51a1 to 51a4 are turned off.

In addition, the input instructions S1, S2, S5 and S7 of the switches 31a, 31b, 71a to 71c are not turned off, and the discharge command S4 is not input to the discharge circuit section 45 (1), and the primary capacitor 43 is supplied. The charge of the secondary side capacitor 63 does not discharge.

The reason for only turning off the switching elements 51a1 to 51a4 without discharging the charge of the capacitor is a phenomenon in which the rise of the temperature of the DCDC converter may be caused by a temporary overload, and it cannot be said that it is an abnormality of the DCDC converter itself immediately. It is also less likely to damage the DCDC converter.

Further, another setting value lower than the setting value is set, and at the time when the other setting value is exceeded, first, the control is performed to suppress the temperature rise by reducing the current of the DCDC converter, and switching when the setting value is exceeded. When the elements 51a1 to 51a4 are configured to be turned off, the driving can be continued with force, which is preferable.

By operating as described above, the abnormality in the temperature of the DCDC converter can be detected, the power storage system can be stopped quickly, and the damage can be avoided.

In addition, it is possible to shorten the time required for restarting by charging the capacitor again.

(Fault Detection 11-1) Switching Device Error Detection

The system control unit 120 (1) includes a detection circuit (not shown) in which an abnormality (described above is described below) of the switching elements 51a1 to 51a4 of the converter circuit 51a is incorporated in the switching elements 51a1 to 51a4. ) Or when it is detected by the drive circuit (not shown) of the switching elements 51a1 to 51a4 or the converter control unit 52a, after recognizing it by the status signal F3, switching of the DCDC converter 50 (1). The elements 51a1 to 51a4 are stopped, the input commands S0, S1, S2, S5 to S7 of the switches 8a, 31a, 31b, 71a to 71c are turned off, and the discharge command S4 to the discharge circuit section 45 (1). To discharge the electric charges of the primary capacitor 43 and the secondary capacitor 63.

In addition, when the built-in detection circuit (not shown) detects an abnormality, the switching elements 51a1 to 51a4 independently do not depend on the off command from the system control unit 120 (1) or the converter control unit 52a. You may turn off switching. A switching element having such a function has been put to practical use by calling an intelligent power module. In this way, it is possible to turn off the switching quickly without delaying the detection of the abnormality, thereby improving the protection performance.

In addition, the above abnormality is excessive when the current flowing through the switching elements 51a1 to 51a4 is excessively increased, and when the temperature inside the switching elements 51a1 to 51a4 is greater than or equal to a predetermined set value, the switching element 51a1. It is a case where the voltage of the on-off signal of 51a4) may become unstable. These phenomena are phenomena that may lead to breakage of the switching elements 51a1 to 51a4.

By operating as mentioned above, abnormality of a switching element can be detected, a power storage system can be stopped quickly, and escalation of damage can be avoided.

(Fault detection 12-1) Primary overcurrent detection

The system control unit 120 (1) is operated after the switch (8a) of the breaker (8) (step 1A-1), or (step 4B-1), the switch (8a) by the overcurrent When self-releasing, the auxiliary contact signal S0 turns off even though the input command S0 is turned on, so that it detects this, stops the switching elements 51a1 to 51a4 of the DCDC converter 50 (1), and switches 8a. , Input instructions S0, S1, S2, S5 to 57 of 31a, 31b, 71a to 71c are turned off, and the discharge instruction S4 is input to the discharge circuit section 45 (1), and the primary side capacitor 43 and the secondary side The electric charge of the capacitor 63 is discharged.

When the switch 8a self-releases due to overcurrent, it is possible to consider the possibility that the overcurrent has flown due to a short circuit or a ground fault. Therefore, the above operation can be stopped quickly and the damage can be increased. Can be avoided.

(Fault Detection 13-1) Secondary Overcurrent Detection

When the fuse 101a or 101b is blown, the system control unit 120 (1) detects this because the auxiliary contact signals F8 and F9 are turned on and detects the switching elements 51a1 to 51a4 of the DCDC converter 50 (1). Is stopped, the input commands S0, S1, S2 and 55 to 57 of the switches 8a, 31a, 31b, 71a to 71c are turned off, and the discharge command S4 is input to the discharge circuit section 45 (1), and the primary side The electric charges of the capacitor 43 and the secondary side capacitor 63 are discharged.

Since the blowdown of the fuses 101a and 101b may be considered to be caused by an overcurrent caused by a short circuit or a ground fault, the above-described operation can quickly stop the power storage system and avoid damage. .

(Error Detection 14-1) Error in Power Storage Unit

The system controller 120 (1) turns off the switching elements 51a1 to 51a4 when a state signal F10 indicating the temperature abnormality, overcharge, or overdischarge from the power storage unit monitor 112 is input.

Subsequently, in the case where the temperature is abnormal, when the F10 is no longer abnormal, the operation of the switching elements 51a1 to 51a4 is started.

In the case of indicating overcharge, the DCDC converter 50 (1) is allowed to operate only with the flow of power from the secondary side to the primary side in order to discharge from the power storage unit 110.

On the contrary, in the case of overdischarge, the DCDC converter 50 (1) is allowed to operate only with the flow of power from the primary side to the secondary side in order to charge the power storage unit 110.

In addition, when the state signal F10 continues to indicate temperature abnormality, overcharge, or overdischarge even after a certain time has elapsed, the system control unit 120 (1) is concerned that an irreparable abnormality has occurred in the power storage unit 110. ) Stops the switching elements 51a1 to 51a4 of the DCDC converter 50 (1), turns off the input instructions S0, S1, S2, S5 to S7 of the switches 8a, 31a, 31b, 71a to 71c, The discharge command S4 is input to the discharge circuit portion 45 (1), and the electric charges of the primary capacitor 43 and the secondary capacitor 63 are discharged.

By operating as described above, the concept of the power storage unit can be detected, the power storage system can be stopped quickly, and the expansion of damage can be avoided.

In detecting the abnormality, it is preferable that the occurrence of the abnormality is recorded or displayed on an indicator (not shown) or a display monitor (not shown) provided in the system control unit or the apparatus, the driver's seat, or the like.

Moreover, in the abnormality detection item,

(Fault detection 1-1) Differential current error detection,

(Fault detection 2-1) Switch error detection,

(Fault Detection 3-1) Detection of primary capacitor charging failure (when starting the primary side),

(Fault detection 4-1) Detection of secondary capacitor charging failure (when starting the primary side)

(Fault detection 5-1) Detection of secondary capacitor charging failure (at secondary side start),

(Fault detection 6-1) Detection of primary capacitor charging failure (at secondary side start),

(Fault detection 11-1) Switching element error detection,

(Fault detection 12-1) Primary overcurrent detection,

(Fault Detection 13-1) Secondary Overcurrent Detection,

(Error Detection 14-1) Error in Power Storage Unit

In this regard, since restarting is highly likely to cause damage, the system control unit 120 (1) prohibits the start of the power storage system at the same time as the abnormality detection. Prohibition of starting is not canceled unless an artificial operation such as pressing a reset button provided on a steering wheel or a system control unit is performed.

By configuring in this way, it is possible to avoid expanding the damage of the abnormal point by the easy restart.

In the above abnormality detection,

(Fault detection 7-1) Primary capacitor overvoltage detection,

(Fault detection 8-1) Secondary capacitor overvoltage detection,

(Fault detection 9-1) DCDC converter overcurrent detection,

(Fault detection 10-1) DCDC converter temperature error detection

Since the possibility of a temporary phenomenon caused by disturbance or the like can be considered, the system control unit 120 (1) automatically restarts after a predetermined time after the stopping action. At this time, the presence or absence of abnormal occurrence is monitored again, and if the same kind of abnormality is not detected within a certain time, the operation is continued as it is. If the same kind of abnormality is detected again within a certain time, the abnormality detection and At the same time prohibit starting the power storage system. The prohibition of starting is not canceled unless an artificial manipulation such as pressing a reset button installed on a steering wheel or a system control unit is performed.

In this way, it is possible to avoid expanding the damage of the abnormal point by easy restart while preventing the stop of the excessive power storage system of the system due to the temporary abnormality caused by the disturbance.

In addition, when the voltage of the control power supply of the system control part 120 (1) is less than predetermined value, the following operation | movement is performed.

When the voltage of the control power supply of the system control part 120 (1) is less than the predetermined value, or it turns off, the discharge command S4 is input to the discharge circuit part 45 (1), and the primary capacitor 43 The electric charges of the secondary capacitor 63 are discharged.

At the same time, in order to open the switches 8a, 31a, 31b, 71a to 71c, the input commands S0 to S2 and S5 to S7 are turned off.

The meaning of the above operation is demonstrated.

The switching elements 51a1 to 51a4 may be damaged when the voltage of the gate signal controlling the on / off decreases. To avoid this, the system control unit 120 (1) switches quickly when the control power is turned off. Then, the electric charges of the primary capacitor 43 and the secondary capacitor 63 are discharged again so that no voltage is applied to the switching element.

In addition, since a certain discharge operation is required when the control power is turned off, the system controller 120 (1) and the discharge element driving circuit 46d maintain the control power supply voltage even after the control power is turned off. Until the discharge is completed (usually about 3 seconds), a power supply backup circuit (not shown) using a power storage element such as an electrolytic capacitor is provided to keep the discharge element 46c in an on state.

With the above configuration, even when the power supply system suddenly loses control while the power storage system is in operation, it is possible to reliably discharge the charges of the primary capacitor 43 and the secondary capacitor 63, and to open the switch. Therefore, it is possible to avoid damaging the power storage system, including the switching element.

With the configuration of Embodiment 1 described above, application to a train system having an optimal start, operation, stop, abnormality detection method and operation method at the time of abnormality detection, which are important and indispensable in practical use of the power storage system. It is possible to obtain an optimal power storage system.

In addition, although description of the DC power supply of FIG. 2 is made into the structure which acquires a DC power supply to the vehicle side through a current collector, and mounts a power storage system in a vehicle, it is a matter of course that a power storage system is ground-based. It may be installed between stations or at substations (not shown).

Embodiment 2.

18 is a diagram showing an example of the configuration of a power storage system according to a second embodiment of the present invention. Since Embodiment 2 is a modification of the structural example of Embodiment 1 as a base, below, the part of the same structure as Embodiment 1 attaches | subjects the same code | symbol, abbreviate | omits the description, and demonstrates only another part.

As shown in FIG. 18, the DC power supply 1 (2) is disposed in place of the DC power supply 1 (1), and is configured to be input to the power storage system 200 (2).

The power storage system 200 (2) has a configuration in which the primary filter unit 40 (2) is disposed in place of the primary filter unit 40 (1).

19 is a diagram showing a configuration example of the DC power supply 1 (2) according to the second embodiment of the present invention. As illustrated in FIG. 19, the DC power supply 1 (2) includes a substation 1a, a wire 1b, a current collector 1c, a rail 1i, a switch 1d having a current interrupting function, and a reactor ( It is the voltage of the both ends of the capacitor 1f of the circuit comprised by the drive control apparatus 1j which consists of 1e), the capacitor 1f, the electric motor, or the inverter 1g which drives the load 1h.

FIG. 20 is a diagram showing a configuration example of the primary filter 40 (2) of Embodiment 2 of the present invention. The reactor 41 is removed, the noise filter 44 is connected to the rear end of the voltage detector 42 which detects the primary capacitor voltage V2, and the primary capacitor 43 is arranged at the rear end of the noise filter 44. .

In addition, the operation steps from the start of the power storage system 200 (2) in the configuration shown in the second embodiment to the stop via normal operation, the method of detecting abnormality, and the operation in the case of detecting an abnormality Since the description is made with the contents shown in the first embodiment, the description thereof will be omitted.

By setting it as the structure of Embodiment 2 shown above, when using a power storage system in combination with the drive control apparatus 1j, it becomes possible to share the reactor 1e of the drive control apparatus 1j, and embodiment It becomes possible to omit the reactor 41 which existed at 1, and it becomes possible to obtain a compact, lightweight electric power storage system.

Moreover, if the interruption | blocking part 8 is abbreviate | omitted and it is set as the structure shared with the switch 1d of the drive control apparatus 1j, it becomes possible to obtain a more compact and lightweight electric power storage system.

Embodiment 3.

21 is a diagram showing a configuration example of the power storage system according to the third embodiment of the present invention. Since Embodiment 3 is modified based on the structural example of Embodiment 1, below, the part of the same structure as Embodiment 1 attaches | subjects the same code | symbol, abbreviate | omits the description, and demonstrates only another part.

As shown in FIG. 21, in the power storage system 200 (3), a discharge circuit 45 (2) is disposed in place of the discharge circuit unit 45 (1), and the system is replaced with the system control unit 120 (1). The control part 120 (3) is arrange | positioned.

The system control unit 120 (3) outputs the primary side discharge command S41 and the secondary side discharge command S42 to the discharge circuit unit 45 (2), and state signals F41 and F42 are inputted from the discharge circuit unit 45 (2). I am made to become the composition.

Fig. 22 is a diagram showing a configuration example of the discharge circuit portion 45 (2) of Embodiment 3 of the present invention. As shown in FIG. 22, the positive side of the circuit which connected the discharge element 46c1 and the discharge resistor 46e1 in series was connected to the wiring drawn from the positive side of the rear end of the primary side filter part 40 (1), It is a structure which connects a negative side to negative side wiring.

Moreover, the positive side of the circuit which connected the discharge element 46c2 and the discharge resistor 46e2 in series was connected to the wiring drawn from the front side of the front end of the secondary side filter part 60 (1), and the negative side is connected to the negative side wiring. It is a structure to connect.

The discharge element 46c1 or 46c2 is controlled on and off by the discharge element drive circuit 46d1 or 46d2. The primary side discharge command S41 and the secondary side discharge command S42 including on / off commands of the discharge element 46c1 or 46c2 are input from the system control unit 120 (3) to the discharge element drive circuit 46d1 or 46d2, respectively. From the discharge element drive circuit 46d1 or 46d2, the state signal F41 or F42 including the operation state of the discharge element 46c1 or 46c2 is input to the system control part 120 (3).

In addition, in the operation step from the start of the electric power storage system 200 (3) in the configuration shown in the third embodiment to the stop after the normal operation, the system control unit 120 (1) is used. 3)) and the description thereof will be made as described in the first embodiment. Therefore, the description thereof will be omitted.

In addition, about the method of abnormality detection and the operation | movement at the time of detecting an abnormality, (abnormality detection 7-1) and (abnormality detection 8-1) are different from what was shown in Embodiment 1, respectively (explained abnormality 7) -3) and (error detection 8-3).

(Fault detection 7-3) Primary capacitor overvoltage detection

The system control unit 120 (3), when the primary capacitor voltage V2 detected by the voltage detector 42 exceeds an arbitrary setting value,

To stop the switching elements 51a1 to 51a4 of the DCDC converter 50 (1),

The input commands S1, S2, S5 to S7 of the switches 31a, 31b, 71a to 71c are turned off,

The primary side discharge command S41 is input to the discharge circuit portion 45 (2), and the electric charge of the primary side capacitor 43 is discharged.

By operating as described above, the overvoltage of the primary capacitor voltage V2 can be detected, the power storage system can be stopped quickly, and the damage can be avoided.

In the third embodiment, since the electric discharge of the secondary capacitor 63 is not discharged, it is possible to prevent unnecessary discharge operation.

(Fault detection 8-3) Secondary capacitor overvoltage detection

The system controller 120 (1), when the secondary side capacitor voltage V3 detected by the voltage detector 62 exceeds an arbitrary setting value,

To stop the switching elements 51a1 to 51a4 of the DCDC converter 50 (3),

The input commands S1, S2, S5 to S7 of the switches 31a, 31b, 71a to 71c are turned off,

The secondary side discharge command S42 is input to the discharge circuit portion 45 (2), and the electric charge of the secondary side capacitor 63 is discharged.

By operating as mentioned above, the overvoltage of the secondary side capacitor voltage V3 can be detected, a power storage system can be stopped quickly, and escalation of damage can be avoided.

In the third embodiment, since the electric discharge of the primary capacitor 43 is not discharged, unnecessary discharge operation can be prevented.

For other abnormality detection items, the discharge circuit section 45 (1) is connected to the discharge circuit section 45 (2), and the discharge command S4 is used as the primary side discharge command S41 and the secondary side discharge command S42. The present invention will be described with reference to the first embodiment by reading the discharge elements 46c1 and 46c2, respectively.

In the configuration of Embodiment 3 described above, the primary capacitor 43 and the secondary capacitor 63 can be discharged separately as needed, and unnecessary discharge operation is eliminated, so that efficient power storage can be achieved. It is possible to obtain a system.

Embodiment 4.

FIG. 23 is a diagram showing the configuration of the power storage system according to the fourth embodiment of the present invention. FIG.

Since Embodiment 4 is a modification of the structural example of Embodiment 1 as a base, below, the part of the same structure as Embodiment 1 attaches | subjects the same code | symbol, the description is abbreviate | omitted, and only another part is demonstrated.

As shown in FIG. 23, in the power storage system 200 (4), the primary side switch unit 30 (2) is disposed in place of the primary side switch unit 30 (1), and the system control unit 120 (1). Instead, the system control unit 120 (4) is arranged.

24 is a diagram illustrating a configuration example of the primary side switch unit 30 (2) of Embodiment 4 of the present invention.

As shown in Fig. 24, the primary side switch unit 30 (2) includes a switch 31a and a switch 31b arranged in series on the positive side, and a charging resistor 32 connected in parallel to the switch 31b. It is composed. Input signals S1 and S2 are input to the switches 31a and 31b, respectively, and auxiliary contact signals F1 and F2 are input to the system control unit 120 (4) from the switches 31a and 31b.

Next, the operation steps from the start of the power storage system 200 (4) in the configuration shown in the fourth embodiment to the stop through normal operation will be described.

For primary side start:

(Steps 1A-4)

Since the system control unit 120 (1) is replaced with the system control unit 120 (4) and read, the same as in the first embodiment (steps 1A-1) is omitted.

(Steps 2A-4)

The system control unit 120 (4) recognizes the normal closing of the switch 8a, and then, if the state where the primary voltage V1 detected by the voltage detector 21 is equal to or higher than the set value continues for a certain period of time, the input command S1 is output, the coil 31a3 of the switch 31a is excited, and the main contact 31a1 is put in. As a result, the primary capacitor 43 is charged via the charging resistor 32.

The system control unit 120 (4) switches the input command S1 on, and at the stage where the auxiliary contact signal F1 is turned on reliably and the auxiliary contact signal F1 is turned on for an arbitrary time, the switch It is recognized that 31a is normally turned on, and after a certain time has elapsed or the difference between the primary side voltage V1 and the primary capacitor voltage V2 becomes less than or equal to the set value, and after the predetermined time has elapsed, the primary capacitor 43 It is judged that the charging is completed, and the input instruction S2 is output. Thereby, the coil 31a3 of the switch 31b is excited, and the main contact 31a1 is thrown in.

The system controller 120 (3) indicates that the switch 31b is normally turned on at a stage where the auxiliary contact signal 21 of the switch 31b is securely closed and the auxiliary contact signal F2 is turned on for an arbitrary time. Recognize.

(Steps 3A-4)

When the system control unit 120 (4) confirms that the switch 31b is normally input, the system control unit 120 (4) outputs an operation command S3 to the converter control unit 52a. At this time, S3 is a command for operating the DCDC converter 50 (1) in the initial charging mode to charge the secondary capacitor 63, and a signal including the secondary capacitor voltage V3 and the secondary voltage V4. The converter control section 52a, upon receiving this operation command S3, controls the converter circuit 51a so that the secondary capacitor voltage V3 is equal to the tertiary side voltage V4, allowing the necessary power to flow from the primary side to the secondary side. The vehicle side capacitor 63 is charged. At this time, in order not to damage the secondary capacitor 63 due to rapid charging, the converter controller 52a controls the current of the converter circuit 51a so as to limit the current flowing from the primary side to the secondary side to a set value. It has a function of charging the capacitor 63.

The system controller 120 (4) determines that the difference between the secondary capacitor voltage V3 and the secondary voltage V4 is within a set value, and after the set time has elapsed, the charging of the secondary capacitor 63 is completed.

(Step 4A-4) to (Step 8A-4)

By replacing the system control unit 120 (1) with the system control unit 120 (4), the description is the same as that shown in the first embodiment (steps 4A-1) to (steps 8A-1).

For secondary side start:

(Step 1B-4) to (Step 2B-4)

Since the system control unit 120 (1) is replaced with the system control unit 120 (4) and read, it becomes the same as that shown in the first embodiment (steps 1B-1) to (step 2B-1), and thus description thereof is omitted.

(Steps 3B-4)

When the system control unit 120 (4) determines that the charging of the primary capacitor 43 is completed, the system control unit 120 (4) turns on the input instructions S1 and S2 for inputting the switches 31a and 31b. Thereby, the input coil 31a3 of each of the switches 31a and 31b is driven, and the main contact 31a1 is input. As a result, the auxiliary contact 31a2 interlocked with the main contact 31a1 is closed, and the auxiliary contact signals F1 and F2 indicating the state of each auxiliary contact 31a2 are output to the system control unit 120 (4).

The system control part 120 (4) has input instructions S1 and S2 turned on, and the auxiliary contact signal 31a2 of the switch 31a is securely closed so that the auxiliary contact signals F1 and F2 are turned on for an arbitrary time. In the step, it is recognized that the input of the switches 31a and 31c has been completed normally.

(Steps 4B-4)

After recognizing the normal closing of the switches 31a and 31b, the system control unit 120 (4) outputs the closing command S0 of the switch 8a to excite the coil 31a3 of the switch 8a, and the main contact point. Input 31a1.

In the stage where the input instruction S0 is on and the state in which the auxiliary contact signal F0 of the switch 8a is securely closed and the auxiliary contact signal F0 is turned on for a certain period of time continues, the system control unit 120 (4) normally operates. It is recognized that the switch 8a is turned on.

(Step 5B-4) to (Step 8B-4)

Since the system control unit 120 (1) is replaced with the system control unit 120 (4) and read, the system control unit 120 (1) becomes the same as that shown in the first embodiment (steps 5B-1) to (step 8B-1). In addition, since the method of abnormality detection and the operation | movement in case an abnormality is detected are demonstrated with the content shown in Embodiment 1 by reading the system control part 120 (1) into the system control part 120 (4), it demonstrates here. Omit.

Since the switch 31a and 31b are arrange | positioned in series by setting it as the structure of Embodiment 4 shown above, even if the switch 31b cannot be opened by failure, for example, it is not possible to open a circuit by the switch 31a. Therefore, it becomes possible to obtain an electric power storage system which can more reliably open the primary side circuit.

Embodiment 5.

FIG. 25 is a diagram showing a configuration example of a power storage system according to a fifth embodiment of the present invention. FIG.

Since Embodiment 5 is a modification of the structural example of Embodiment 1 as a base, below, the part of the same structure as Embodiment 1 attaches | subjects the same code | symbol, abbreviate | omits the description, and demonstrates only another part.

As shown in FIG. 25, the secondary side switch unit 70 (2) is disposed in the power storage system 200 (5) instead of the secondary side switch unit 70 (1), and the system control unit 120 (1). Instead of)), the system control unit 120 (5) is arranged.

Fig. 26 is a diagram showing an example of the configuration of the secondary side switch section 70 (2) according to the fifth embodiment of the present invention.

As shown in Fig. 26, the secondary switch unit 70 (2) includes switches 71a and 71b arranged in series on the positive side, charging resistors 72 connected in parallel to the switch 71b, and the negative side. It consists of switches 71c arranged in series.

Input signals S5 to S7 are input to the switches 71a to 7lc from the system controller 120 (5), respectively, and auxiliary contact signals F5 to F7 are input to the system controller 120 (5) from the switches 71a to 71c. It becomes the structure that becomes.

Since the internal structure of the switches 71a-71c is the same as that shown in FIG. 7, description is abbreviate | omitted.

In addition, although 71a-71c is shown as a mechanical switch, if it can open and close a circuit and check the operation | movement, it is not limited to this, For example, a semiconductor type non-contact switch may be sufficient.

Next, the operation steps from the start of the electric power storage system 200 (5) in the configuration shown in the fifth embodiment to the stop through normal operation will be described.

For primary side start:

(Step 1A-5) to (Step 3A-5)

Since the system control unit 120 (1) is replaced with the system control unit 120 (5) and read, it becomes the same as that shown in the first embodiment (steps 1A-1) to (steps 3A-1), and thus description thereof is omitted.

(Steps 4A-5)

When the system control unit 120 (5) determines that the charging of the secondary capacitor 63 has been completed, the system control unit 120 (5) turns on the input instructions S5 to S7 for inserting the switches 71a to 71c. Thereby, the input coil 31a3 of each of the switches 71a-71c is driven, and the main contact 31a1 is input. As a result, the auxiliary contact 31a2 interlocked with the main contact 31a1 is closed, and the auxiliary contact signals F5 to F7 indicating the state of each auxiliary contact 31a2 are output to the system controller 120 (5).

The system control part 120 (5) has input instruction S5-S7 on, and the auxiliary contact signal 31a2 of switch 71a-71c is reliably closed, and the state which the auxiliary contact signal F5-F7 turned on for the arbitrary time is carried out. In the subsequent step, it is recognized that the input of the switches 71a to 71c is normally completed.

In addition, the switches 71a-71c may be thrown in simultaneously, and may be thrown in order. By sequentially feeding in, the peak power required for the feeding can be reduced, and only the switch put in the last can be used as a switch capable of opening and closing the current. In general, since a switch capable of opening and closing a current becomes large, the number of uses thereof can be reduced, so that a compact and lightweight device can be configured.

(Steps 5A-5)

When the system controller 120 (5) determines that the inputs of the switches 71a to 71c are completed normally, the system controller 120 (5) maintains the current ILP (or ILN on the negative side) of the coupling reactor 51a5 with respect to the converter controller 52a. The operation command S3 is outputted to drive.

As a result, the converter control section 52a controls the converter circuit 51a so that the current ILP (or ILN on the negative side) of the coupling reactor 51a5 becomes zero.

Further, the control primary current I1P (or I1N) may be controlled to be zero, or the control secondary current I2P (or I2N) may be controlled to be zero, and the primary side current I1 and current detected by the current detector 11 may be controlled. You may control so that the secondary side positive current I3 detected by the detector 91 may become zero. In addition, you may drive so that the secondary side side current I5 which is a detection value of the current detector 93 may become zero instead of the secondary side positive side current I3.

The system control unit 20 (5) determines that the converter control unit 52a is normal when the state in which the detected value of the current to be controlled is equal to or lower than the set value continues for a predetermined time.

(Steps 6A-5)

Since the system control unit 120 (1) is replaced with the system control unit 120 (5) and read, the same as in the first embodiment (steps 6A-1) is omitted.

(Steps 7A-5)

Since the system control unit 120 (1) is replaced with the system control unit 120 (5) and read, the same as in the first embodiment (steps 7A-1) is omitted.

(Steps 8A-5)

Since the system control unit 120 (1) is replaced with the system control unit 120 (5) and read, the same as in the first embodiment (steps 8A-1) is omitted.

For secondary side start:

(Steps 1B-5)

When the control power of the system control unit 120 (5) is turned on and the command C1 including the start command is input from the outside, the system control unit 120 (5) monitors the power storage unit 112 of the power storage unit 110. Of the switches 71a and 71c when the state signal F10 is confirmed and no abnormality has occurred and the state in which the secondary voltage V4 detected by the voltage detector 81 is equal to or higher than the set value is continued for an arbitrary time. Turn on the input instructions S5 and S7. Thereby, the input coil 31a3 of each of the switches 71a and 71c is driven, and the main contact 31a1 is input. As a result, the auxiliary contact 31a2 interlocked with the main contact 31a1 is closed, and the auxiliary contact signals F5 and F7 indicating the state of each auxiliary contact 31a2 are output to the system control unit 120 (5).

The system control part 120 (5) has input instruction S5, S7 turned on, and the auxiliary contact signal 31a2 of switch 71a, 71c is reliably closed, and the state which the auxiliary contact signal F5, F7 turned on for arbitrary time turns on. In the subsequent step, it is recognized that the input of the switches 71a and 71c has been completed normally.

In addition, the switches 71a and 71c may be thrown in simultaneously, or may be put in order. It is possible to reduce the peak power required for the sequential input by sequential charging, and since a control power supply having a small peak content is sufficient, it is possible to obtain a compact and lightweight electric power storage system.

By inputting the switches 71a and 71c, the secondary capacitor 63 is charged via the charging resistor 72.

The system controller 120 (5) recognizes that the inputs of the switches 71a and 71c have been completed normally, and then the state continues for an arbitrary time, or the difference between the secondary voltage V4 and the secondary capacitor voltage V3 is set. It becomes less than the value and, after a fixed time elapses, it is determined that charging of the secondary capacitor 63 has been completed, and an injection command S6 is output. Thereby, the coil 31a3 of the switch 71b is excited, and the main contact 31a1 is thrown in.

The system controller 120 (5) indicates that the switch 71b is normally turned on at a stage where the auxiliary contact 31a2 of the switch 71b is reliably closed so that the auxiliary contact signal F6 is turned on at any time. Recognize.

(Steps 2B-5)

The system controller 120 (1) is read as the system controller 120 (5), and the switch 71a is read as the switch 71b to read the same as in the first embodiment (steps 2B-1). The description is omitted.

(Step 3B-5) to (Step 8B-5)

Since the system control unit 120 (1) is replaced with the system control unit 120 (5) and read, it becomes the same as that shown in the first embodiment (steps 3B-1) to (step 8B-1), and the description thereof is omitted.

In addition, about the abnormality detection method, since it describes as what was shown in Embodiment 1 by changing the system control part 120 (1) into the system control part 120 (5), it abbreviate | omits description.

Since the switch 71a and 71b are arrange | positioned in series by setting it as the structure of Embodiment 5 shown above, even if the switch 71b cannot be opened by failure, for example, a circuit can be opened with the switch 71a. Therefore, it becomes possible to obtain an electric power storage system which can open the secondary side circuit more reliably.

Embodiment 6.

27 is a diagram showing an example of the configuration of a power storage system according to a sixth embodiment of the present invention.

Since Embodiment 6 is a modification of the configuration example of Embodiment 1 as a base, hereinafter, parts having the same configuration as Embodiment 1 are denoted by the same reference numerals, and the description thereof is omitted, and only different parts will be described.

As shown in FIG. 27, the DCDC converter 50 (2) is disposed in the power storage system 200 (6) instead of the DCDC converter portion 50 (1), and instead of the discharge circuit portion 45 (1). The discharge circuit portion 43 (3) is arranged, and the secondary filter portion 60 (2) is disposed in place of the secondary filter portion 60 (1), and the system control portion instead of the system control portion 120 (1). 120 (6) is disposed.

The discharge circuit part 45 (3) is connected to the positive side and the negative side of the rear end of the primary side filter part 40 (1), and the secondary side filter part 60 (2) is connected to the system control part 120 (6). It does not have a signal to input.

FIG. 28 is a diagram showing a configuration example of the DCDC converter 50 (2) of Embodiment 6 of the present invention.

As shown in Fig. 28, the DCDC converter 50 (2) is composed of a converter circuit 51b and a converter controller 52b, and an operation command S3 is transmitted from the system controller 120 (6) to the converter controller 52b. It inputs, and the state signal F3 is output from the converter control part 52b to the system control part 120 (6).

29 is a diagram illustrating a configuration example of the converter circuit 51b.

As shown in Fig. 29, a bidirectional step-down DCDC converter circuit composed of two switching elements 51b1 to 51b2 is constructed. This circuit is a circuit capable of bi-directional power flow control only when the primary side voltage (left terminal in the drawing) of the converter circuit is always greater than the secondary side voltage (right terminal in the drawing).

Since the number of switching elements required by this circuit is half that of the converter circuit 51a shown in Embodiment 1, the compact weight of a DCDC converter part is attained, and it is possible to obtain a compact lightweight storage system.

As shown in FIG. 28 and FIG. 29, the converter control unit 52b includes the operation, stop, control mode, power flowing between the primary side and the secondary side of the DCDC converter than the system control unit 120 (6), and the converter primary side current I1P. (Or I1N), the operation command S3 including the command value (target value) of the converter secondary side current I2P (or I2N) and the primary capacitor voltage V2 is input, and the system control unit 120 (6) is input from the converter control unit 52b. ), The state signal F3 of the DCDC converter 50 (2) is input.

The status signal F3 is a status signal including each negative voltage, current, temperature, switching, on / off state of the device, and fault condition of the DCDC converter 50 (2). Based on the operation command S3, the converter control unit 52b PWM-controls the switching elements 51b1 to 51b2 of the converter circuit 51b.

30 is a diagram showing a configuration example of the discharge circuit portion 45 (3) of the sixth embodiment of the present invention.

As shown in FIG. 30, the positive side of the circuit which connected the discharge element 46c and the discharge resistor 46e in parallel to the wiring drawn from the positive side of the rear end of the primary side filter part 40 (1), The negative side is connected to the negative side wiring.

The discharge element 46c is controlled on and off by the discharge element drive circuit 46d. The discharge command S4 including the on-off command of the discharge element 46c is input to the discharge element drive circuit 46d from the system control unit 120 (6), and the system control unit (46d) is input from the discharge element drive circuit 46d. The state signal F4 including the operation state of the discharge element 46c is input to 120 (6).

Fig. 31 is a diagram showing an example of the configuration of the secondary filter 60 (2) of Embodiment 6 of the present invention.

As shown in FIG. 31, the noise filter 64 is connected, and the reactor 61 is connected to the rear end of the noise filter 64.

The reactor 61 is for smoothing so that a large ripple component is not included in the current of the power storage unit 110.

Since the structure of the noise filter 64 is the same as that of the description shown in Embodiment 1, it abbreviate | omits.

The noise filter 64 is preferably the rear end of the secondary capacitor 63 and is provided near the secondary capacitor 63.

Next, a description will be given of the parts different from the first embodiment with respect to the operation steps from the start of the electric power storage system 200 (6) in the configuration shown in the sixth embodiment to the stop through the normal operation.

For primary side start:

(Steps 1A-6), (steps 2A-6)

The system control unit 120 (1) is replaced with the system control unit 120 (6) and the DCDC converter unit 50 (1) is read into the DCDC converter unit 50 (2), thereby reading the first embodiment (step 1A). -1) and (step 2A-1), so description is omitted.

(Steps 3A-6)

This step does not exist.

(Steps 4A-6)

When the system control unit 120 (6) determines that the input of the switch 31a is normally completed, the system control unit 120 (6) turns on the input instructions S5 and S7 for inputting the switches 71a and 71c. Thereby, the input coil 31a3 of each of the switches 71a and 71c is driven, and the main contact 31a1 is input. As a result, the auxiliary contact 31a2 interlocked with the main contact 31a1 is closed, and the auxiliary contact signals F5 and F7 indicating the state of each auxiliary contact 31a2 are output to the system control unit 120 (6).

The system control part 120 (6) has input instruction S5, S7 turned on, and the auxiliary contact signal 31a2 of switch 71a, 71c is reliably closed, and the state which the auxiliary contact signal F5, F7 turned on for arbitrary time is carried out. In the subsequent step, it is recognized that the input of the switches 71a and 71c has been completed normally.

In addition, the switches 71a and 71c may be thrown in simultaneously, or may be put in order. By sequentially sequencing, the peak power required for the squeezing can be reduced, and only the switch to be put last can be used as a switch capable of opening and closing the current. In general, a switch capable of opening and closing a current becomes large, but since the number of uses thereof can be reduced, a small and light power storage system can be obtained.

(Steps 5A-6)

When the system control unit 120 (6) determines that the input of the switches 71a and 71c has been completed normally, the converter control unit 52b causes the converter primary side current I1P (or I1N) to become zero or the converter secondary side. The operation command S3 is outputted to operate by keeping the current 12P (or I2N) at zero.

Moreover, you may control so that the primary side current I1 detected by the current detector 11 and the secondary side positive current I3 detected by the current detector 91 may become zero.

In addition, the secondary side side current I5, which is a detection value of the current detector 93, may be zero instead of the secondary side positive side current I3.

The system controller 120 (6) determines that the converter controller 52b is normal when the state in which the detected value of the current to be controlled is equal to or lower than the set value continues for a predetermined time.

(Steps 6A-6)

The system control unit 120 (6) determines that the converter control unit 52b is normal, and then inputs the operation command S3 including the current command I * or the power command P * to the converter control unit 52b.

As a result, the converter control section 52b controls the current or the current between the primary side and the secondary side to match the command.

The current to be controlled is any one of the converter primary side current I1P (or I1N) and the converter secondary side current I2P (or I2N).

In addition, the operation command S3 including the voltage command V * may be input from the system control unit 120 (6) to the converter control unit 52b. In this case, the converter control unit 52b receives the voltage V2 of the primary capacitor 43. The converter circuit 51b is controlled to match the voltage command V *.

(Steps 7A-6)

When the operation command C1 including the stop command is input from the outside, the system control unit 120 (6) inputs the operation command S3 to the converter control unit 52b to gradually reduce the current of the converter to zero.

The converter control section 52b controls the converter circuit 51b to gradually reduce the current to finally zero. The time until the current is narrowed to zero shall be set arbitrarily. If the state in which the current has fallen below the set value continues for a certain time, the system control unit 120 (6) inputs the operation command S3 to stop the DCDC converter 50 (2), and the converter control unit 52b switches. The elements 51b1 to 51b2 are turned off, and this is output to the status signal F3. The system control unit 120 (6) checks the state signal F3 and confirms that the DCDC converter 50 (2) has normally stopped.

The current to be controlled is any one of the converter primary side current I1P (or I1N) and the converter secondary side current I2P (or I2N).

In addition, by turning off the switching elements 51b1 to 51b2 after reducing the current to zero, it is possible to prevent the primary side capacitor voltage V2 from suddenly changing to become an overvoltage or the like.

(Steps 8A-6)

The system control unit 120 (1) is replaced with the system control unit 120 (6), and the DCDC converter unit 50 (1) is replaced with the DCDC converter unit 50 (2), respectively. Since the process is the same as in steps 8A-1), the description is omitted.

For secondary side start:

(Steps 1B-6)

When the control power of the system control unit 120 (6) is turned on and the command C1 including the start command is input from the outside, the system control unit 120 (6) monitors the power storage unit 112 of the power storage unit 110. Of the switches 71b and 71c, when the state signal F10 is confirmed and no abnormality has occurred and the state where the secondary voltage V4 detected by the voltage detector 81 Turn on the input instructions S6 and S7. Thereby, the input coil 31a3 of each of the switches 71b and 71c is driven, and the main contact 31a1 is input. As a result, the auxiliary contact 31a2 interlocked with the main contact 31a1 is closed, and the auxiliary contact signals F6 and F7 indicating the state of each auxiliary contact 31a2 are output to the system control unit 120 (6).

The system control part 120 (6) has input instruction S6, S7 turned on, and the auxiliary contact signals 31 and 2 of switch 71b, 71c are reliably closed, and the state which the auxiliary contact signal F6, F7 turned on for arbitrary time turns on. In the subsequent step, it is recognized that the input of the switches 71b and 71c has been completed normally.

In addition, the switches 71b and 71c may be thrown in simultaneously or sequentially. It is possible to reduce the peak power required for the sequential input by sequential charging and to provide a control power supply having a small peak content, thereby making it possible to obtain a compact and lightweight electric power storage system.

When the switches 71b and 71c are input, the primary capacitor 43 is charged through the charging resistor 72 and the diode portions of the switching elements 51b1 to 51b2 of the DC DC converter 50 (2).

After the system controller 120 (6) recognizes that the inputs of the switches 71b and 71c have been completed normally, the state continues for an arbitrary time, or the difference between the secondary voltage V4 and the primary capacitor voltage V2 is a set value. In addition, after a predetermined time has elapsed, it is determined that the initial charging of the primary capacitor 43 has been completed, and the injection command S5 is output. Thereby, the coil 31a3 of the switch 71a is excited, and the main contact 31a1 is thrown in.

The system control part 120 (6) can normally input the switch 71a in the stage in which the auxiliary contact signal 31 of the switch 71a was surely closed, and the auxiliary contact signal F5 was turned on for an arbitrary time. Recognize that it was.

(Steps 2B-6)

When the system control unit 120 (6) confirms that the switch 71a is normally input, the system control unit 120 (6) outputs an operation command S3 to the converter control unit 52a. At this time, S3 is a command for driving the DCDC converter 50 (2) in the boost charging mode to further charge the primary capacitor 43, and a signal including the primary capacitor voltage V2 and the primary voltage V1. When the converter control section 52b receives this operation command S3, the converter circuit 51b is operated to further charge the primary capacitor 43 by flowing necessary power from the secondary side to the primary side. At this time, the primary capacitor 43 is charged while controlling the current to the converter circuit 51b so as to limit the current flowing from the primary side to the secondary side to a set value so as not to damage the primary capacitor 43 by rapid charging. I am in a constitution.

The converter controller 52b reduces the current flowing from the secondary side to the primary side when the difference between the primary side capacitor voltage V2 is within a set value or when the primary side capacitor voltage V2 reaches a predetermined value. The control is performed so that the abnormal primary capacitor voltage V2 does not rise.

The system controller 120 (6) determines that the difference between the primary capacitor voltage V2 and the primary voltage V1 is within a set value, and after a reset time has elapsed or when the primary capacitor voltage V2 reaches a predetermined set value, It is determined that charging of the primary capacitor 43 is completed.

(Steps 3B-6), (steps 4B-6)

The system control unit 120 (1) is replaced with the system control unit 120 (6), and the DCDC converter unit 50 (1) is replaced with the DCDC converter unit 50 (2), respectively. Since steps 3B-1) and (step 4B-1) are the same, the description is omitted.

(Step 5B-1)

When the system controller 120 (6) determines that the input of the switch 8a is normally completed, the system controller 120 (6) issues the operation command S3 to the converter controller 52b to operate by keeping the converter tertiary side current I2P (or I2N) at zero. Output

As a result, the converter control section 52b controls the converter circuit 51b so that the converter secondary side current I2P (or I2N) becomes zero.

In addition, you may control so that converter primary side current I1P (or I1N) may become zero, the primary side current I1 detected by the current detector 11, the secondary side positive side current I3 detected by the current detector 91, and the current detector 93 may be carried out. You may control so that the secondary side side current I5 which is a detection value of) may become zero.

The system controller 120 (6) determines that the converter controller 52b is normal when the state in which the detected value of the current to be controlled is equal to or lower than the set value continues for a predetermined time.

(Steps 6B-6)

The system control unit 120 (6) determines that the converter control unit 52b is normal, and then inputs the operation command S3 including the current command I * or the power command P * to the converter control unit 52b.

As a result, the converter control section 52b controls the current or the electric power between the primary side and the secondary side to match the command.

The current to be controlled is any one of the converter primary side current I1P (or I1N) and the converter secondary side current I2P (or I2N).

In addition, the operation command S3 including the voltage command V * may be input from the system control unit 120 (6) to the converter control unit 52b. In this case, the converter control unit 52b converts the primary side capacitor voltage V2 into the voltage command V *. The converter circuit 51b is controlled to coincide with.

(Steps 7B-6)

When the operation command C1 including the stop command is input from the outside, the system control unit 120 (6) inputs the operation command S3 to the converter control unit 52b to gradually reduce the current of the converter to zero.

The converter control section 52b controls the converter circuit 51b to gradually reduce the current to finally zero. The time until the current is reduced to zero shall be arbitrarily set. If the state in which the current has fallen below the set value continues for a certain time, the system control unit 120 (6) inputs the operation command S3 to stop the DCDC converter 50 (2), and the converter control unit 52b switches. The elements 51b1 to 51b2 are turned off, and this is output to the status signal F3. The system control unit 120 (6) checks the state signal F3 and confirms that the DCDC converter 50 (2) has normally stopped.

The current to be controlled is any one of the converter primary side current I1P (or I1N) and the converter secondary side current I2P (or I2N).

In addition, by turning off the switching elements 51b1 to 51b2 after reducing the current to zero, it is possible to prevent the primary side capacitor voltage V2 from suddenly changing to become an overvoltage or the like.

(Steps 8B-6)

As shown in the first embodiment, the system control unit 120 (1) is read as the system control unit 120 (6) and the DCDC converter unit 50 (1) is replaced with the DCDC converter unit 50 (2). Since it becomes the same as (step 8B-1), description is abbreviate | omitted.

By the operation steps from the above start to normal operation through the stop, it is possible to obtain a power storage system with reliable operation.

In addition, when only the operation by primary side starting is performed, the switch 71b and the charging resistor 72 of the secondary side switch part 70 (1) are unnecessary and may be deleted.

In addition, when only the operation by the secondary side start is performed, the switch 31b and the charging resistor 32 of the primary side switch unit 30 (1) are unnecessary and may be deleted.

Next, the detailed abnormality detection method and operation | movement at the time of detecting a design of the electric power storage system shown in Embodiment 6 are demonstrated.

In order to operate the electric power storage system stably and safely, it is necessary to take appropriate measures promptly according to the kind of anomalies when an abnormality occurs in each part of the electric power storage system. Therefore, since it becomes important to determine what kind of measures are taken in accordance with the above-described detection method and the above-mentioned kinds, it will be described below.

(Error detection 1-6) When detecting differential current error

The system control unit 120 (6) performs any one of the circuits when the state in which the primary side difference current I2 and the secondary side difference current I4, which are outputs of the current detectors 12 and 92, is not less than or equal to a set value for a predetermined time period. It is determined that an increase in leakage current due to insulation deterioration or the like occurs at a location, and the input signals S0 to S2 and S5 to S7 of the switches 8a, 31a, 31b, 71a to 71c are turned off, and the DCDC converter 50 (2) is turned off. ) Switching elements 51b1 to 51b2 are turned off, and the discharge command S4 is input to the discharge circuit portion 45 (3) to discharge the electric charges of the primary capacitor 43.

By operating as described above, the increase in the leakage current can be detected, the power storage system can be stopped quickly, and the damage can be avoided.

In addition, when the set value is configured in a plurality of stages and the current difference is sufficiently small, the power storage system does not stop, and a recording device (not shown) or an indicator light (not shown) installed in the system control unit or the device, the driver's seat, or the like is shown. May be configured to prompt inspection.

(Fault detection 2-6) Switch error detection

Although the system control unit 120 (6) turns on the input command S0 of the switch 8a, the main contact 31a1 is not inputted due to a failure of the input coil 31a3 of the switch 8a, and the auxiliary contact ( If the state in which 31a2) is not closed and the auxiliary contact signal F0 is not turned on for a certain time continues, the auxiliary contact 31a2 is turned on while the input command S0 is turned off, and the auxiliary contact signal F0 is turned on. If the status continues for a random time,

The system control unit 120 (6) regards the abnormality of the switch 8a.

In addition, abnormality detection is performed also about switches 31a, 31b, 71a-71c.

When an abnormality is detected in either of the switches 8a, 31a, 31b, 71a to 71c, the system control unit 120 (1) inputs S0 to S2 of all the switches 8a, 31a, 31b, 71a to 71c. , S5 to S7 are turned off, the switching elements 51b1 to 51b2 of the DCDC converter 50 (2) are turned off, the discharge command S4 is input to the discharge circuit portion 45 (3), and the primary-side capacitor 43 Discharge the charge.

By operating as described above, the failure of the switch can be detected, the power storage system can be stopped quickly, and the expansion of the damage can be avoided.

(Fault detection 3-6) Detection of primary capacitor charging fault (when starting primary)

The system control unit 120 (6) recognizes that the switch 31b is normally input in the above steps 2A-6 at the time of primary side startup, and then even after a certain time has elapsed, the primary side voltage V1 and the primary side capacitor voltage. When the difference with V2 is greater than or equal to the set value, or when the primary current I1 flows more than the set value, it is determined that charging cannot be completed due to an abnormality such as a ground fault of the primary capacitor 43, and the switch 8a, The input commands S0 to S2 of 31a and 31b are turned off, the discharge command S4 is input to the discharge circuit section 45 (3), and the electric charge of the primary capacitor 43 is discharged.

By operating as mentioned above, abnormality of the charging circuit of the primary side capacitor 43 can be detected, a power storage system can be stopped quickly, and escalation of damage can be avoided.

(Fault detection 6-6) Detection of primary capacitor charging failure (when starting the secondary side)

The system control unit 120 (6) does not complete initial charging of the primary capacitor 43 within the set time in the above-mentioned (steps 2B-5) and (steps 2B-6) at the time of secondary side startup. If not, or when the status signal F3 indicating the failure of the converter is received from the converter control section 52b, the switch is regarded as an abnormality around the DCDC converter 50 (2) or the primary capacitor 43, and the switch has been inserted until then. The input commands S6 and S7 of the 71b and 71c are turned off, the switching elements 51b1 to 51b2 of the DCDC converter 50 (2) are stopped, and the discharge command 54 is sent to the discharge circuit portion 45 (3). And discharge the primary capacitor 43 charge.

By operating as mentioned above, abnormality of the charging circuit of the primary side capacitor 43 can be detected, a power storage system can be stopped quickly, and escalation of damage can be avoided.

(Fault detection 7-6) Primary capacitor overvoltage detection

The system controller 120 (6) stops the switching elements 51b1 to 51b2 of the DCDC converter 50 (2) when the primary capacitor voltage V2 detected by the voltage detector 42 exceeds an arbitrary set value. To turn off the input commands S1, S2, S5 to S7 of the switches 31a, 31b, 71a to 71c, input the discharge command S4 to the discharge circuit section 45 (3), and charge the primary capacitor 43 charge. Discharge.

By operating as described above, the overvoltage of the primary capacitor voltage V2 can be detected, the power storage system can be stopped quickly, and the damage can be avoided.

(Fault detection 9-6) DCDC converter overcurrent detection

The system control unit 120 (6) turns off the switching elements 51b1 to 51b2 of the DCDC converter 50 (2) when the current of the switching elements 51b1 to 51b2 of the converter circuit 51b is greater than or equal to a predetermined set value. Let's do it.

In addition, instead of the current of the switching elements 51b1 to 51b2, the switching elements 51b1 to 51b2 may be turned off when the converter secondary side current ILP (or I2N) is equal to or larger than a set value.

In addition, the input instructions S1, S2, S5 and S7 of the switches 31a, 31b, 71a to 71c are not turned off, and the discharge command S4 is not input to the discharge circuit portion 45 (3), and the primary capacitor 43 Does not discharge.

The reason for only turning off the switching elements 51b1 to 51b2 without discharging the charge of the capacitor 43 is a phenomenon in which an overcurrent of the DCDC converter may be temporarily generated due to a disturbance caused by a sudden change in the primary capacitor voltage V2. This is not an abnormality of the DCDC converter itself, and it is less likely to damage the DCDC converter.

By operating as described above, the overcurrent of the DCDC converter can be detected to quickly stop the power storage system, and escalation of damage can be avoided.

In addition, it is possible to shorten the time required for restarting by charging the capacitor again.

(Error detection 10-6) DCDC converter temperature error detection

The system control unit 120 (6) has an arbitrary surface temperature of the switching elements 51b1 to 51b2 of the converter circuit 51b or a temperature of a cooling fin (not shown) on which the switching elements 51b1 to 51b2 are mounted. When the setting value is equal to or greater than, the switching elements 51b1 to 51b2 are turned off.

In addition, the input instructions S1, S2, S5 and S7 of the switches 31a, 31b, 71a to 71c are not turned off, and the discharge command S4 is not input to the discharge circuit portion 45 (3), and the primary capacitor 43 Does not discharge.

The reason for only turning off the switching elements 51b1 to 51b2 without discharging the charge of the capacitor is that a rise in the temperature of the DCDC converter may occur due to temporary overload, and it cannot be said that it is an abnormality of the DCDC converter itself. It is also less likely to damage the DCDC converter.

Further, another setting value lower than the setting value is set, and at the time when the other setting value is exceeded, first, the control is performed to suppress the temperature rise by reducing the current of the DCDC converter, and switching when the setting value is exceeded. When the elements 51b1 to 51b2 are configured to be turned off, it is preferable because the driving can be continued with force.

By operating as described above, the abnormality in the temperature of the DCDC converter can be detected, the power storage system can be stopped quickly, and the damage can be avoided.

In addition, it is possible to shorten the time required for restarting by charging the capacitor again.

(Fault Detection 11-6) Switching Device Error Detection

The system control part 120 (6) is a detection circuit (not shown) in which the abnormality (the above content is demonstrated below) of the switching elements 51b1 to 51b2 of the converter circuit 51b is built in the switching elements 51b1 to 51b2. ) Or when it is detected by the drive circuit (not shown) of the switching elements 51b1 to 51b2 or the converter controller 52b, after recognizing it by the status signal F3, switching of the DCDC converter 50 (2). The elements 51b1 to 51b2 are stopped, the input commands S0, S1, S2, S5 to S7 of the switches 8a, 31a, 31b, 71a to 71c are turned off, and the discharge command S4 to the discharge circuit section 45 (3). To discharge the electric charge of the primary capacitor 43.

In addition, when the built-in detection circuit (not shown) detects an abnormality, the switching elements 51b1 to 51b2 independently do not depend on the off command from the system control unit 120 (6) or the converter control unit 52b. You may turn off switching. A switching element having such a function has been put to practical use by being called an intelligent power module. In this way, there is no delay from the detection of the abnormality, and the switching can be turned off sooner, thereby improving the protection performance.

The above abnormality is excessive when the current flowing through the switching elements 51b1 to 51b2 is excessively increased, and when the temperature inside the switching elements 51b1 to 51b2 is greater than or equal to a predetermined set value, the switching elements 51b1 to 51b2. This is a case where the voltage of the on-off signal of 51b2) may become unstable. These phenomena are phenomena that may lead to breakage of the switching elements 51b1 to 51b2.

By operating as mentioned above, abnormality of a switching element can be detected, a power storage system can be stopped quickly, and escalation of damage can be avoided.

(Fault Detection 12-6) Primary Overcurrent Detection

When the switch 8a self-releases due to overcurrent, the system control unit 120 (6) detects this because the auxiliary contact signal S0 turns off even though the input command S0 is turned on, and the DCDC converter 50 (2) detects this. Of the switching elements 51b1 to 51b2, the input commands S0, S1, S2, S5 to S7 of the switches 8a, 31a, 31b, 71a to 71c are turned off, and the discharge circuit section 45 (3) is turned off. The discharge command S4 is input, and the electric charge of the primary capacitor 43 is discharged.

When the switch 8a self-releases due to overcurrent, the possibility of the overcurrent flowing due to a short circuit or a ground fault can be considered. Thus, by operating as described above, the power storage system can be stopped quickly and the damage is increased. Can be avoided.

(Fault Detection 13-6) Secondary Overcurrent Detection

When the fuse 101a or 101b is blown, the system control unit 120 (6) detects this because the auxiliary contact signals F8 and F9 are turned on and detects the switching elements 51b1 to 51b2 of the DCDC converter 50 (2). Stop, the input commands S0, S1, S2, S5 to S7 of the switches 8a, 31a, 31b, 71a to 71c are turned off, and the discharge command S4 is input to the discharge circuit section 45 (3), and the primary side The electric charge of the capacitor 43 is discharged.

Since the blowdown of the fuses 101a and 101b may be considered to have caused an overcurrent due to a short circuit or a ground fault, the above-described operation can quickly stop the power storage system and prevent damage from escalating. Can be.

(Error Detection 14-6) Error in Power Storage Unit

The system controller 120 (6) turns off the switching elements 51b1 to 51b2 when a state signal F10 indicating the temperature abnormality, overcharge, or overdischarge from the power storage unit monitor 112 is input.

Subsequently, when F10 does not indicate the temperature abnormality, the operation of the switching elements 51b1 to 51b2 is started.

In the case of indicating overcharge, the DCDC converter 50 (2) is allowed to operate only with the flow of power from the secondary side to the primary side in order to discharge from the power storage unit 110.

On the contrary, in the case of overdischarge, the DCDC converter 50 (2) is allowed to operate by only allowing the power flow from the primary side to the secondary side in order to charge the power storage unit 110.

In addition, when the state signal F10 continues to indicate temperature abnormality, overcharge, or overdischarge even after a predetermined time has elapsed, the system controller 120 (6) may be concerned that an irreparable abnormality is occurring in the power storage unit 110. ) Stops the switching elements 51b1 to 51b2 of the DCDC converter 50 (2), turns off the input instructions S0, S1, S2, S5 to S7 of the switches 8a, 31a, 31b, 71a to 71c, The discharge command S4 is input to the discharge circuit portion 45 (3), and the electric charge of the primary capacitor 43 is discharged.

By operating as described above, an abnormality at the time of power storage can be detected, the power storage system can be stopped quickly, and expansion of damage can be avoided.

In detecting the abnormality, it is preferable that the occurrence of the abnormality is recorded or displayed on an indicator (not shown) or a display monitor (not shown) provided in the system control unit or the apparatus, the driver's seat, or the like.

Moreover, in the abnormality detection item,

(Fault detection 1-6) Differential current error detection,

(Fault detection 2-6) Switch error detection,

(Fault detection 3-6) Primary capacitor charging fault detection (at primary side start),

(Fault detection 6-6) Detection of primary capacitor charging failure (at secondary side start),

(Fault detection 11-6) Switching device error detection,

(Fault detection 12-6) Primary overcurrent detection,

(Fault detection 13-6) Secondary overcurrent detection,

(Error detection 14-6) Error in the power storage unit,

In this regard, since restarting is highly likely to cause damage, the system control unit 120 (6) prohibits the start of the power storage system at the same time as the abnormality detection. Prohibition of starting is not canceled unless an artificial operation such as pressing a reset button provided on a steering wheel or a system control unit is performed.

By configuring in this way, it is possible to avoid expanding the damage of the abnormal point by easy restart.

In the above abnormality detection,

(Fault detection 7-6) Primary capacitor overvoltage detection,

(Detection detection 9-6) DCDC capacitor overcurrent detection,

(Fault detection 10-6) DCDC converter temperature error detection,

Since the possibility of a temporary phenomenon caused by disturbance or the like can be considered, the system control unit 120 (6) automatically restarts after a predetermined time after the stopping action. At this time, the presence or absence of abnormal occurrence is monitored again, and if the same kind of abnormality is not detected within a certain time, the operation is continued as it is. At the same time prohibit starting the power storage system. Prohibition of starting is not canceled unless an artificial operation such as pressing a reset button provided on a steering wheel or a system control unit is performed.

In this way, it is possible to avoid expanding the damage of the abnormal point by easy restart while preventing the excessive power storage system of the system from being stopped due to a temporary abnormality caused by disturbance.

In addition, when the voltage of the control power supply of the system control part 120 (6) is less than predetermined value, the following operation | movement is performed.

When the voltage of the control power supply of the system control part 120 (6) is less than predetermined value, or it turns off, the system control part 120 (6) is carried out in order to avoid the damage of the switching elements 51b1-51b2. The discharge command S4 is input to the discharge circuit portion 45 (3), and the electric charge of the primary capacitor 43 is discharged.

In addition, in order to open the switches 8a, 31a, 31b, 71a to 71c at the same time, the input commands S0, S1, S2, and S5 to S7 are turned off.

The meaning of the above operation is the same as that shown in the first embodiment, and description thereof is omitted.

In the structure of Embodiment 6 shown above, since there are two switching elements used for the DCDC converter part 50 (2), it becomes possible to reduce the DCDC converter part 50 (2) to small size and light weight, It is possible to obtain a power storage system.

Embodiment 7.

32 is a diagram showing a configuration example of a power storage system according to a seventh embodiment of the present invention. Since Embodiment 7 is a modification of the configuration example of Embodiment 6 as a base, hereinafter, parts having the same configuration as Embodiment 6 are denoted by the same reference numerals, and the description thereof is omitted, and only different parts will be described.

As shown in FIG. 32, the DC power supply 1 (2) is disposed instead of the DC power supply 1 (1), and is configured to be input to the electric power storage system 200 (7).

The power storage system 200 (7) has a configuration in which the primary filter unit 40 (2) is disposed in place of the primary filter unit 40 (1).

In addition, since the structure of the DC power supply 1 (2) and the primary side filter part 40 (2) is the same as FIG.19, FIG.20 demonstrated in Embodiment 2, description is abbreviate | omitted.

In addition, the operation steps from the start of the electric power storage system 200 (7) to the stop through the normal operation and the abnormality detection method in the configuration shown in the seventh embodiment are described in the contents shown in the sixth embodiment. The description is omitted.

With the configuration of the seventh embodiment described above, when the power storage system is used in combination with the drive control device 1j, it is possible to share the reactor 1e of the drive control device 1j. It is possible to omit the existing reactor 41 and to obtain a compact and lightweight electric power storage system.

Moreover, if the interruption | blocking part 8 is abbreviate | omitted and it is set as the structure shared with the switch 1d of the drive control apparatus 1j, it becomes possible to obtain a more compact and lightweight electric power storage system.

In addition, in the structure of Embodiment 1-7 shown above, although the switch 71c is provided in order to open the negative side of the electric power storage part 110, what is necessary is just to be able to open the positive side at least, and in this case, the switch 71c ) May be omitted.

In addition, in the structure of Embodiments 1-7 shown above, it may be comprised as a system control part and a converter control unit, and may be comprised as one, and may divide and configure a control part for arbitrary functions on the contrary.

In addition, in the structure of Embodiments 1-7 shown above, although it is set as the structure at the time of connecting a power storage system to a DC power supply, it goes without saying that you may connect to the output of the converter circuit which rectifies an AC power supply.

In addition, the structure shown to the above Embodiment 1-7 is an example of the content of this invention, It is also possible to comprise each embodiment in combination, It is also possible to combine with another well-known technique, and do not deviate from the summary of this invention. Needless to say, the present invention can be changed and configured, for example, by omitting a part thereof.

In addition, the present invention is not limited to electric power storage systems for electric vehicles and the like, and it goes without saying that the present invention can be applied to various related fields such as automobiles, elevators, and electric power systems.

According to the present invention, it is possible to realize an electric power storage system having an optimal system configuration for a train system and the like, reliably starting, operating, and stopping the vehicle, and coping appropriately with various abnormalities.

Claims (41)

In a power storage system for adjusting the DC power from the DC power supply to a predetermined voltage, current by the DCDC converter section and stored in the power storage unit, A primary side current detector for detecting a current of a main circuit, a primary side voltage detector for detecting a voltage of a main circuit, and a primary side switch for opening and closing the main circuit on the DC power supply side (primary side) of the DCDC converter; And a primary filter unit for suppressing the high frequency of the main circuit, and a secondary filter unit for suppressing the high frequency of the main circuit and opening / closing of the main circuit on the power storage unit side (secondary side) of the DCDC converter unit. A secondary side switch unit, a secondary side voltage detector for detecting the voltage of the main circuit, a secondary side current detector for detecting the current of the main circuit, The primary side current detector, the primary side voltage detector, the primary side switch unit, the primary side filter unit, the DCDC converter unit, the secondary side filter unit, the secondary side switch unit, the secondary side voltage detector, the secondary side A current controller, and a system controller to which a state signal obtained from the electric power storage unit is input, The system control unit detects an abnormality based on the input state signal and controls to stop at least one of the primary side switch unit, the DCDC converter unit, and the secondary side switch unit individually according to the above contents. Power storage system. The method of claim 1, The primary side filter part is composed of a primary side capacitor connected between a reactor connected in series to the main circuit and a stationary part of the main circuit, The secondary side filter unit is composed of a secondary side capacitor connected between a reactor connected in series to the main circuit and the main circuit, and according to a command from the system control unit, the primary side capacitor and the secondary side capacitor are separately provided. Or a discharge circuit portion configured to discharge both at the same time. The method of claim 2, The primary side current detector, the primary side voltage detector, the primary side switch unit, and the primary side filter unit are arranged in sequence, and a blocking unit having current blocking means is provided between the DC power supply source and the primary side current detecting unit, A protection device having the secondary filter part, the secondary switch part, the secondary voltage detector, the secondary current detector and the power storage part sequentially arranged and having a current interruption means between the secondary current detector and the power store; Electric power storage system characterized in that the installation. The method of claim 2, When the power storage system is activated, the DCDC converter is operated to initially charge a secondary capacitor built into the secondary filter by its output, or 1 built in the primary filter by power of the power storage unit. An electric power storage system characterized by initially charging the vehicle side capacitor. The method of claim 3, wherein The interruption unit is a power storage system, characterized in that consisting of a switch having an auxiliary contact mechanically coupled to the main contact. The method of claim 1, And said primary switch portion has means for opening and closing the positive side of the main circuit. The method of claim 6, And the primary switch unit is configured as a switch having an auxiliary contact mechanically coupled to a main contact. The method of claim 7, wherein And said primary side switch portion has a circuit connecting said switch and a charging resistor. The method of claim 1, And the primary current detector has means for detecting a difference between currents flowing in the positive wiring and the negative wiring. The method according to claim 1 or 2, And the primary filter unit and the secondary filter unit each have a noise filter. The method of claim 1, The DCDC converter unit is a power storage system, characterized in that consisting of a bi-directional buck-boost converter circuit. The method of claim 1, The DCDC converter is a power storage system, characterized in that consisting of a bidirectional step-down converter circuit. The method of claim 1, The secondary storage unit is configured to have a means for opening and closing only the positive side of the main circuit, or both the positive side and the negative side. The method of claim 13, The secondary switch unit, the power storage system, characterized in that consisting of a switch having a secondary contact mechanically coupled to the main contact. The method of claim 14, And said secondary side switch portion has a circuit connecting said switch and a charging resistor. The method of claim 1, And the secondary current detector has means for detecting a difference between currents flowing between the positive wiring and the negative wiring. The method of claim 3, wherein And the protection device has means for detecting a state of the current interrupting means. The method of claim 1, And the power storage unit is configured by connecting a plurality of cells in parallel and in parallel, and inputs a state signal from a monitor device for detecting a state of the cell to the system control unit. The method of claim 5, wherein And the system controller is configured to recognize a normal input of the breaker by checking an auxiliary contact signal from the breaker after outputting an input command to the breaker. The method of claim 7, wherein The system control unit is configured to recognize the normal input of the primary switch unit by checking the auxiliary contact signal from the primary switch unit after outputting the input command to the primary switch unit. system. The method of claim 2, The system control unit recognizes that the charging of the primary capacitor is completed after an arbitrary set time has elapsed since the difference between the detected value from the primary voltage detector and the voltage of the primary capacitor becomes equal to or less than an arbitrary set value. Power storage system, characterized in that. The method of claim 2, The system control unit recognizes that the charging of the secondary side capacitor is completed after an arbitrary set time has elapsed since the difference between the detected value from the secondary side voltage detector and the voltage of the secondary side capacitor is equal to or less than an arbitrary set value. Power storage system, characterized in that. The method of claim 14, And the system control unit outputs an instruction for input to the secondary switch unit, and then checks an auxiliary contact signal from the secondary switch unit to recognize normal input of the secondary switch unit. The method of claim 1, The system controller is configured to control the current of the DCDC converter unit to be zero after confirming normal input of the primary side switch unit and the secondary side switch unit, and when the current detection value is less than or equal to a set value, And a step of determining that the converter section is normal. The method of claim 1, When the power storage system is stopped, the system controller is configured to gradually reduce the current of the DCDC converter to a rate set to zero, and to turn off the switching element embedded in the DCDC converter after the current has fallen below a set value. Power storage system, characterized in that. The method of claim 1, And the system control unit turns off the primary side switch unit and the secondary side switch unit after the switching element built in the DCDC converter is turned off. The method of claim 3, wherein The system controller may include the blocking unit, the primary side current detector, the primary side voltage detector, the primary side switch unit, the primary side filter unit, the DCDC converter unit, the secondary side filter unit, and the discharge circuit unit. An abnormality is detected by the state signal obtained from the secondary side switch unit, the secondary side voltage detector, the secondary side current detector, the protection device unit, and the power storage unit, and the breaker and the primary side switch unit are And controlling at least one of the DCDC converter unit, the discharge circuit unit, and the secondary switch unit. The method of claim 27, The system control unit may be configured such that the above-mentioned content is the difference between the positive side wire detected by the primary side current detection unit and the current flowing through the negative side wire is greater than or equal to a set value, or the positive side wire and the secondary side wire detected by the secondary side current detection unit. When the difference in the current flowing is greater than or equal to a set value, at least the primary side switch unit, the secondary side switch unit, and the DCDC converter unit are turned off, and the discharge circuit unit connected to the primary side filter unit and the secondary side filter unit is turned on. Power storage system. The method of claim 27, The system control unit turns off at least the primary side switch unit, the secondary side switch unit, and the DCDC converter unit when the abnormality is an abnormality of any one of the cutoff unit, the primary side switch unit, and the secondary side switch unit. And turning on the discharge circuit portion. The method of claim 27, The system control unit turns off at least the primary side switch unit, the secondary side switch unit, and the DCDC converter unit when the above contents are equal to or higher than the charging of the primary capacitor or the secondary side capacitor, and turns on the discharge circuit unit. Power storage system, characterized in that. The method of claim 27, The system control unit turns off at least the primary side switch unit, the secondary side switch unit, and the DCDC converter unit when the above content is an overvoltage of the primary side capacitor or the secondary side capacitor and turns on the discharge circuit unit. Power storage system characterized in that the configuration. The method of claim 1, The system control unit turns off the DCDC converter unit when the above content is an overcurrent of the DCDC converter. The method of claim 1, The system control unit turns off the DCDC converter unit when the above content is equal to or higher than a temperature of the DCDC converter. The method of claim 27, The system control unit turns off the primary side switch unit, the secondary side switch unit, and the DCDC converter unit when the above content is an error of the switching element of the DCDC converter, and turns on the discharge circuit unit. Storage system. The method of claim 27, The above system control section is configured to turn off at least the primary side switch portion, the secondary side switch portion, and the DCDC converter portion when the breaker automatically cuts off the circuit without passing through the system control portion, and the discharge circuit portion Power storage system, characterized in that to turn on. The method of claim 27, The system control unit turns off at least the primary side switch unit, the secondary side switch unit, and the DCDC converter unit when the above contents automatically cut off the circuit without passing through the system control unit, and the discharge Power storage system, characterized in that the circuitry is turned on. The method of claim 27, The system control unit turns off at least the primary side switch unit, the secondary side switch unit, and the DCDC converter unit when the abnormality is an abnormality of the electric power storage unit, and turns on the discharge circuit unit. . The method of claim 1, And when the abnormality occurs, the system controller records the abnormality in the system controller and notifies the external device of the abnormality. The method of claim 1, The system control unit divides the abnormality into a plurality of categories according to the contents thereof, automatically classifies the system after restarting at least by the abnormality detection, and classifies restarting only when an artificial reset operation is performed. Power storage system. The method according to claim 1 or 2, The system control unit includes an operation command from the outside, the primary current detector, the primary voltage detector, the primary switch unit, the primary filter unit, the DCDC converter unit, the secondary filter unit, and the secondary side. And a control unit for inputting all the state signals obtained from the switch unit, the secondary side voltage detector, the secondary side current detector, and the power storage unit. delete