JP2017099183A - Switching unit, and charge discharge controller including it, and their switching control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switching unit capable of supplying a sufficient power to a power load even during operation stop of a system power supply, and to provide a charge discharge controller including the same, and a switching control system therefor.SOLUTION: A switching board 2 provided between a system power supply CS and a power load L includes a first current path 22a, a second current path 22b, a first switch 21a and a second switch 21b. The first current path is connected with the first I/O end A of a charge discharge controller 1 performing charge discharge control of a power storage device B, and the system power supply. A second current path is connected with the power load L. One end of the first switch is connected with the first current path, and the other end is connected with the second current path. One end of the second switch is connected with the second I/O end B of the charge discharge controller, and the other end is connected with the second current path. The second current path is further connected with the output end C of a power controller (PV-PCS)4 performing power control of a solar cell string PV.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a technique for supplying power to a power load.

  In recent years, electric power systems aiming at energy independence by using a power storage system using an electric vehicle in addition to a solar power generation system are spreading in ordinary homes and business establishments. Existing photovoltaic power generation systems are usually configured for the purpose of interconnecting operation with a commercial grid power supply. FIG. 6 is a block diagram illustrating an example of a power system that uses a solar power generation system and a power storage system in combination. In this power system, the power load L is connected to the system power supply CS via the switch SW. In addition, the power line P between the system power supply CS and the switch SW is connected to the power control device PV-PCS to which the solar power generation device PV is connected and the charge / discharge control device EV-PCS to which the electric vehicle EV is connected. ing. The power control device PV-PCS is also connected to an independent outlet O that can be used as an auxiliary power output (for example, about 1 [kW]) when the system power supply CS is stopped (for example, a power failure).

  In addition, there exists a grid connection system of patent document 1 as a prior art relevant to this invention. In this grid interconnection system, the power load is connected to the grid power supply via the first switching means. In addition, the power conversion unit to which the solar power generation device is connected and the charging unit connected to the electric vehicle are connected between the first opening / closing means and the power load via the second opening / closing means. When an abnormality occurs in the system power supply, the first switching means disconnects the grid-connected system from the system power supply, and the second switching means electrically disconnects the power load from the power converter.

JP 2014-27856 A

  Here, according to the statutory grid interconnection regulations, it is prohibited to output power while being electrically connected to the grid power supply CS at the time of a power failure or the like. Therefore, in the power system of FIG. 6, when the operation of the system power supply CS is stopped, the power control device PV-PCS and the charge / discharge control device EV-PCS operate independently and electrically disconnect the connection with the power line P. Therefore, only a relatively low power can be supplied to the power load L via the independent outlet O. Therefore, for example, even in the daytime in fine weather, it is not possible to supply sufficient power to the power load L by making full use of the abundant power generated by the solar power generation device PV during a power failure of the system power supply CS.

  Further, in Patent Document 1, when the system power supply fails, the power load is electrically disconnected from the power conversion unit by the second opening / closing means, and the output of the power conversion unit is supplied to the charging unit and charged. Therefore, even in Patent Document 1, sufficient power cannot be supplied to the power load L.

  In view of the above situation, the present invention provides an open / close switching unit capable of supplying sufficient power to a power load even when the system power supply is stopped, a charge / discharge control device including the same, and their An object is to provide a switching control system.

  In order to achieve the above object, an open / close switching unit according to one aspect of the present invention is an open / close switching unit provided between a system power supply and a power load, and is a charge / discharge control device that performs charge / discharge control of a power storage device. A first energizing path connected to the first input / output terminal and the system power supply; a second energizing path connected to the power load; one end connected to the first energizing path; A first switch connected to two current paths, a second switch having one end connected to the second input / output terminal of the charge / discharge control device and the other end connected to the second current path, An output terminal of a power control device that performs power control of the power generation device is further connected to the second energization path.

  In the open / close switching unit, when the system power supply is operating normally, the first switch is closed and the second switch is opened, and when the system power supply is stopped, The switch may be opened and the second switch may be closed.

  The open / close switching unit may further include a third switch having one end connected to the output end of the power control device and the other end connected to the second energization path.

  Further, in the open / close switching unit, the third switch may be closed if the charge amount of the power storage device is less than an upper limit threshold value, and may be opened when the charge amount reaches the upper limit threshold value. Good.

  Further, in the above open / close switching unit, the first switch is closed after a predetermined period has elapsed from the time when the system power supply returns to normal operation when the system power supply that has been stopped is operating normally. It may be said.

  Alternatively, in the above open / close switching unit, when the system power supply that has been stopped is operating normally, the third switch is closed after a predetermined period has elapsed since the system power supply returned to normal operation. It may be said.

  In the opening / closing switching unit, at least one opening / closing of the first switch, the second switch, and the third switch may be controlled based on a charge amount of the power storage device.

  In order to achieve the above object, a charge / discharge control device according to an aspect of the present invention includes an open / close switching unit provided between a system power supply and a power load, and a charge / discharge control unit that performs charge / discharge control of the power storage device. And a switching control unit that controls the open / close switching unit, wherein the open / close switching unit is connected to the system power supply via a power line to which a first input / output terminal of the charge / discharge control unit is connected. One energizing path, a second energizing path connected to the power load, one end connected to the first energizing path, the other end connected to the second energizing path, and one end connected to the second energizing path A second switch connected to the second input / output end of the charge / discharge control unit, the other end of which is connected to the second energization path, and the second energization path further includes power control of the power generator. The output terminal of the power control device that performs the operation is connected.

  In order to achieve the above object, a switching control system according to an aspect of the present invention includes a charge / discharge control device that performs charge / discharge control of a power storage device, a first switch, and a second switch. An open / close switching unit provided between the load and the load; a switching control unit that controls the open / close switching unit; and a power control device that performs power control of the power generation device. A first input / output terminal connected to a power line connected to the power supply, and a second input / output terminal connected to one end of the second switch, wherein one end of the first switch is connected to the power line. The other end of the first switch is connected to the other end of the second switch through an energization path, the power control device has an output end connected to the energization path, and the switching control unit When the grid power supply is operating normally The first to open the second switch while closing switches, when the system power supply is stopped operating, is configured to close the second switch while opening the first switch.

  According to the present invention, power can be supplied to the power load even when the system power supply is stopped.

It is a block diagram which shows the 1st structural example of a composite electric power system. An example of opening / closing control of a switch of a switching board is shown. It is a block diagram which shows the 2nd structural example of a composite electric power system. The other example of opening / closing control of the switch of a switchboard is shown. It is a block diagram which shows the 3rd structural example of a composite electric power system. It is a block diagram which shows an example of the electric power system which used the solar power generation system and the electrical storage system together.

  Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment>
FIG. 1 is a block diagram illustrating a first configuration example of the composite power system 100. The composite power system 100 is electrically connected to the system power supply CS via the AC power line P. The system power supply CS is, for example, a commercial power system. In this composite power system 100, supply of single-phase, three-wire AC power from the system power supply CS via the AC power line P, and the power can be purchased from an electric power company or the like. In addition, power can be transmitted to the system power supply CS via the AC power line P (ie, reverse power flow), and the power can be sold to an electric power company or the like. In the following, the power that reversely flows (sells power) to the system power supply CS is referred to as reverse power flow, and the power supplied from the system power supply CS to the energization path P is referred to as forward power.

  In addition, a power load L is connected to the composite power system 100. The power load L is composed of a single device or a plurality of devices such as household appliances and factory equipment, and consumes power WL supplied from at least one of the composite power system 100 and the system power supply CS. . Hereinafter, the power WL that is supplied to and consumed by the power load L is referred to as power consumption WL.

  The composite power system 100 includes an AC power line P, a solar cell string PV, an electric vehicle EV having a power storage device B, a power conditioner 1 for a V2H system, a switching board 2, a distribution board 3, and power generation. And a power conditioner 4 for the system. In the following, the power conditioner 1 for the V2H system is referred to as V2H-PCS (vehicle to home-power conditioning system) 1, and the power conditioner 4 for the power generation system is referred to as PV-PCS (Photovoltaics-power conditioning system) 4. Call it. At least a part of the composite power system 100 is installed in a house such as a house or an office, for example.

  AC power line P is, for example, a single-phase three-wire power line, and includes wirings P1 to P5. The wiring P1 connects the system power supply CS to the connection point a of the switching board 2. The wiring P <b> 2 connects the connection point B of the switching panel 2 to the power load L through the distribution board 3. The wiring P3 connects the input / output terminal A for grid interconnection operation of V2H-PCS1 to the wiring P1. The wiring P4 connects the input / output terminal B for independent operation of V2H-PCS1 to the connection point c of the switching panel 2. The wiring P5 connects the output terminal C of the PV-PCS 4 to the connection point d of the switching panel 2.

  The solar cell string PV is a power generation device including one or a plurality of solar cell modules connected in series. The solar cell module is composed of a crystalline solar cell, a polycrystalline solar cell, a thin film solar cell, or the like. The solar cell string PV is connected to the PV-PCS 4 and outputs DC power generated by receiving sunlight to the PV-PCS 4. The power generation device of the combined power system 100 is not limited to the example shown in FIG. It may be a device that combines these. Moreover, the number of the solar cell strings PV connected to PV-PCS4 is not limited to the illustration of FIG. 1, A plurality may be sufficient.

  The electric vehicle EV is equipped with one or a plurality of power storage devices B having a charge / discharge function capable of repeated charge / discharge. For example, power storage device B can charge DC power supplied from V2H-PCS1 and can discharge DC power corresponding to the amount of charge to V2H-PCS1. Note that the configuration of the power storage device B is not particularly limited. For example, the power storage device B may include secondary batteries such as a lithium secondary battery, a nickel hydrogen battery, a nickel cadmium battery, and a lead battery. Alternatively, the power storage device B may include an electric double layer capacitor.

  V2H-PCS1 is a charge / discharge control device that controls the electric vehicle EV and particularly performs charge / discharge control of the power storage device B. For example, the V2H-PCS1 converts AC power input from the wiring P3 or the wiring P4 into DC power and supplies it to the power storage device B for charging, or converts power discharged from the power storage device S into AC power. And output to the wiring P3 or the wiring P4. This V2H-PCS1 includes an interconnection relay 11a, a self-supporting relay 11b, a bidirectional inverter 12, a communication unit 13, a storage unit 14, and a CPU 15.

  The interconnection relay 11a is provided between the bidirectional inverter 12 and the input / output terminal A for grid interconnection operation. That is, one end is connected to the bidirectional inverter 12, and the other end is connected to the wiring P3 at the input / output terminal A.

  The self-supporting relay 11b is provided between the bidirectional inverter 12 and the input / output terminal B for self-supporting operation. That is, one end is connected to the bidirectional inverter 12 and the other end is connected to the wiring P4 at the input / output terminal B.

  When V2H-PCS1 is connected to the system power supply CS to supply AC power to the power load L (when connected operation), the connection relay 11a is closed (ON), and the self-supporting relay 11b is opened (OFF). Is done. Further, when V2H-PCS1 is independent from the system power supply CS and supplies AC power to the power load L (in the case of autonomous operation), the interconnection relay 11a is opened (OFF) and the independent relay 11b is closed (ON). Is done. The opening and closing operations of the interconnection relay 11a and the self-supporting relay 11b are controlled by the CPU 15.

  The bidirectional inverter 12 is a bidirectional power conversion unit controlled by the CPU 15 and also functions as a part of a charge / discharge control unit that performs charge / discharge control of the electric vehicle EV (particularly, the built-in power storage device B). The bidirectional inverter 12 is provided between the power storage device B, the interconnection relay 11a, and the self-supporting relay 11b. The bidirectional inverter 12 can perform bidirectional power conversion as shown in FIG. 1 by PWM (Pulse Width Modulation) control or PAM (Pulse Amplitude Modulation) control. For example, the bidirectional inverter 12 can AC / DC convert AC power input from the interconnection relay 11 a or the independent relay 11 b into DC power suitable for the power standard of the power storage device B and output the power to the power storage device B. Further, the bidirectional inverter 32 DC / AC converts the DC power discharged from the power storage device B into AC power according to the power standard of the system power supply CS and the power load L, and outputs it to the interconnection relay 11a or the independent relay 11b. it can. In the following, the power input to the bidirectional inverter 12 (or the input / output terminals A and B) is referred to as charging power. Further, the AC / DC conversion of the bidirectional inverter 12 is the power conversion or forward conversion in the forward conversion direction. This is called conversion. The DC / AC conversion of the bidirectional inverter 12 is referred to as power conversion or reverse conversion in the reverse conversion direction. Furthermore, the power that is reversely converted and output from the bidirectional inverter 12 (or the power output from the input / output terminals A and B) is referred to as discharge power.

  The storage unit 14 is a non-volatile storage medium that holds stored information in a non-temporary manner without supplying power. The storage unit 14 stores control information, programs, and the like used by each functional element (particularly the CPU 15) of the V2H-PCS1.

  The CPU 15 is a control unit that controls each component of the V2H-PCS 1 and the PV-PCS 4 using information and programs stored in the storage unit 14. The CPU 15 includes a power monitoring unit 151, a conversion control unit 152, a switching control unit 153, and a management unit 154 as functional components.

  The power monitoring unit 151 detects an abnormality (for example, a power failure) of the system power supply CS by monitoring the power flowing through the wiring P3 based on the detection result of the sensor or the like inside the V2H-PCS1.

  The conversion control unit 152 controls the bidirectional inverter 12, and particularly controls its power conversion. The conversion control unit 152 also functions as a part of the charge / discharge control unit, monitors the electric vehicle EV (particularly the built-in power storage device B), and causes the bidirectional inverter 12 to perform charge / discharge control. For example, conversion control unit 152 detects the state of power storage device B based on a signal output from electric vehicle EV, and performs charge / discharge control of power storage device B.

  The switching control unit 153 controls the opening / closing operation of the interconnection relay 11a and the independent relay 11b, and further controls the switching panel 2 (especially the switches 21a and 21b).

  The management unit 154 manages and controls the V2H-PCS1.

  Next, the switching board 2 is an open / close switching unit provided between the system power supply CS and the power load L together with the distribution board 3, and includes switches (switches) 21a and 21b and energization paths 22a to 22d. Composed. One end of the switch 21a is connected to the wiring P1 at the connection point a through the conduction path 22a, and the other end is connected to the wiring P2 at the connection point b through the conduction path 22b. One end of the switch 21b is connected to the wiring P4 at the connection point c through the energization path 22c, and the other end is connected to the wiring P2 at the connection point b through the energization path 22b. Further, the other end of the switch 21a is connected to the other end of the second switch 21b via the energization path 22b. The energization path 22a is further connected to the system power supply CS via the wiring P1. The energizing path 22b is connected to the wiring P5 at the connection point d via the energizing path 22d, and further connected to the output terminal C of the PV-PCS 4 via the wiring P5. Further, the energization path 22c is further connected to the input / output terminal B for self-sustaining operation of the EV-PCS1 via the wiring P4. The opening / closing operations of the switch 21a and the switch 21b are controlled by V2H-PCS1. The opening / closing control will be described in detail later.

  The distribution board 3 is a distribution unit including the main breaker 31 and the branch breaker 32, and is provided on the wiring P2. The main breaker 31 is a circuit breaker, and the branch breaker 32 is a distribution breaker provided in each branch energization path through which the electric power divided in the distribution board 3 flows. The main breaker 31 and the branch breaker 32 are opened (OFF) to disconnect the electrical connection when the current value of the power flowing through the main breaker 31 exceeds the threshold value.

  The PV-PCS 4 is a power control device that performs power control of the solar cell string PV, and converts the power generated by the solar cell string PV into power and outputs it from the output terminal C. The PV-PCS 4 normally controls the operating voltage (operating point) of the solar cell string PV so that the electric power generated by the solar cell string PV is maximized by, for example, MPPT (Maximum Power Point Tracking) control. However, when it is necessary to limit the power generation of the solar cell string PV, the PV-PCS 4 adjusts the power generation amount by setting the operating voltage of the solar cell string PV to a value that deviates from the maximum output operating voltage.

  Moreover, what satisfy | fills the standard defined by the grid connection rule is employ | adopted for PV-PCS4. For this reason, the PV-PCS 4 has a protection function against abnormality in the voltage value and frequency of the system voltage during the interconnection operation. Specifically, the PV-PCS 4 has a function of suppressing or temporarily stopping the output when an increase in the voltage value of the system voltage is detected. The PV-PCS 4 has a function of temporarily stopping output when an abnormality in the frequency or phase of the system voltage is detected.

  The PV-PCS 4 includes an inverter 41, a communication unit 42, a memory 43, and a CPU 44.

  The inverter 41 is a power converter controlled by the CPU 44, and converts DC power generated by the solar cell string PV into AC power corresponding to the power standards of the system power supply CS and the power load L by PWM control or PAM control. And output. The DC input of the inverter 41 is connected to the solar cell string PV, and the AC output of the inverter 41 is connected to the wiring P5 via the output terminal C. Hereinafter, the power that the inverter 41 converts the power generated by the solar cell string PV and outputs the power to the wiring P5 is referred to as generated power Wc. Further, the inverter 41 prevents a reverse current from flowing through the solar cell string PV.

  The communication unit 42 is a communication interface that performs wireless communication or wired communication with the V2H-PCS1. For example, the communication part 42 receives the control signal for controlling each component of PV-PCS4 from V2H-PCS1. Moreover, the communication part 41 transmits information, such as the operation state (especially power conversion amount) of the inverter 41, to V2H-PCS1.

  The memory 43 is a non-volatile storage medium that holds stored information non-temporarily without supplying power. The memory 43 stores control information and programs used by each functional element (particularly the CPU 44) of the PV-PCS 4.

  The CPU 44 is a control unit that controls each component of the PV-PCS 4 using information and programs stored in the memory 43. For example, the CPU 44 controls the inverter 41 based on a control signal output from the V2H-PCS1, and particularly controls its power conversion.

  Next, opening / closing control of the switch 21a and the switch 21b of the switching panel 2 will be described. FIG. 2 shows an example of opening / closing control of the switching panel 2. As shown in FIG. 2, the opening / closing of the switch 21a and the switch 21b of the switching panel 2 is controlled according to the operating state of the system power supply CS.

(When system power supply CS is operating normally)
First, a description will be given of a case where the normal power supply from the system power supply CS and the output of the reverse power supply to the system power supply CS can be performed normally. For example, this is a case where the system power supply CS has not failed. In this case, the switch 21a of the switching board 2 is closed (ON) and the switch 21b is opened (OFF). Further, the V2H-PCS1 closes (ON) the interconnection relay 11a and opens (OFF) the self-supporting relay 11b, and performs interconnection operation with the system power supply CS. Therefore, in the V2H-PCS1, the input / output terminal A for grid operation is electrically connected to the system power supply CS, PV-PCS4, and the power load L, but the input / output terminal B for independent operation is connected to the switch 21b. It is not connected to these by opening (OFF).

  At this time, if the generated power Wc is larger than the power consumption WL of the power load L, a part of the generated power Wc output from the PV-PCS 4 can be supplied to the power load L. Furthermore, the remaining part of the generated power Wc can be sold by flowing backward to the system power supply CS, or can be reversely converted by the V2H-PCS1 to charge the power storage device B. Further, V2H-PCS1 charges power storage device B as necessary.

  On the other hand, if the generated power Wc is less than or equal to the power consumption WL of the power load L, the PV-PCS 4 supplies the generated power Wc to the power load L. Moreover, V2H-PCS1 charges / discharges the electrical storage apparatus B as needed.

(When system power supply CS is not operating normally)
Next, a description will be given of a case where the normal power supply from the system power supply CS and the output of the reverse power supply to the system power supply CS cannot be performed normally. For example, this is a case where the system power supply CS is interrupted due to a lightning strike or equipment failure. In addition, as an exception, a case where the user intentionally shuts down (disconnects) the composite power system 100 from the system power supply CS even when the system power supply CS is operating normally is included. In these cases, the switch 21a of the switching board 2 is opened (OFF) and the switch 21b is closed (ON). Further, the V2H-PCS1 opens (OFF) the interconnection relay 11a and closes (ON) the self-supporting relay 11b, and operates independently. Therefore, in V2H-PCS1, the input / output terminal B for autonomous operation is electrically connected to the PV-PCS 4 and the power load L and connected to the PV-PCS 4, but is not connected to the system power supply CS. Further, the input / output terminal A for the grid operation is not connected to any of the system power supply CS, the PV-PCS 4, and the power load L.

  At this time, if the generated power Wc is larger than the power consumption WL of the power load L, a part of the generated power Wc can be supplied to the power load L. Further, the remaining part can be forward-converted by V2H-PCS1 to charge the power storage device B.

  On the other hand, if the generated power Wc is less than or equal to the power consumption WL of the power load L, the PV-PCS 4 supplies the generated power Wc to the power load L, and the PC1 is a discharge power corresponding to the shortage of the generated power Wc with respect to the power consumption WL. Is supplied to the power load L.

  In addition, when the normal operation of the system power supply CS becomes possible during the period when the V2H-PCS1 is operating independently (for example, when the power supply is restored from a power failure), the switch 21b is first opened (OFF) in the switching panel 2. The input / output terminal B for independent operation of V2H-PCS1 is disconnected from the system power supply CS. Then, the switch 21a is closed (ON) after a predetermined elapsed time from the time when the system power supply CS is restored. This is because the combined power generation system 100 (or PV-PCS 4) is interconnected with the system power supply CS within a certain period from the restoration of the system power supply CS because it is prohibited by the legal system connection regulations. The elapsed time is set to be equal to or longer than the time stipulated in the legal grid connection regulations. When the switch 21a is closed (ON), the PV-PCS 4 is electrically connected to the system power source CS, and automatically operates with the system power source CS if the sunlight incident on the solar cell string PV is sufficient. Resume.

  According to the present embodiment described above, the open / close switching unit 2 is an open / close switching unit 2 provided between the system power supply CS and the power load L, and performs charge / discharge control for performing charge / discharge control of the power storage device B. The first input / output terminal A of the device 1 and the first power supply path 22a connected to the system power supply CS, the second power supply path 22b connected to the power load L, and one end connected to the first power supply path 22a. The other end is connected to the second energizing path 22b, the other end is connected to the second energizing path 22b, and the other end is connected to the second energizing path 22b. A second switch 21b, and an output end of the power control device 4 that performs power control of the power generation device PV is further connected to the second energization path 22b.

  Furthermore, according to the present embodiment, when the system power supply CS is operating normally, the open / close switching unit 2 has the first switch 21a closed (ON) and the second switch 21b opened (OFF). When the system power supply CS is stopped, the first switch 21a is opened (OFF) and the second switch 21b is closed (ON).

  In addition, according to the present embodiment, the switching control system 100 includes the charge / discharge control device 1 that performs charge / discharge control of the power storage device B, the first switch 21a, and the second switch 21b, and includes the system power supply CS and the power load. L is provided with an open / close switching unit 2 provided between L, a switching control unit 153 that controls the open / close switching unit 2, and a power control device 4 that performs power control of the power generation device PV. The first switch 21a has a first input / output terminal A connected to the power line P1 electrically connected to the system power supply CS, and a second input / output terminal B connected to one end of the second switch 21a. Is connected to the power line P1, the other end of the first switch 21 is connected to the other end of the second switch 21b via the energizing path 22b, and the power control device 4 has an output end connected to the energizing path 22b. The switching control unit 153 When the system power supply CS is operating normally, the first switch 21a is closed (ON) and the second switch 2b is opened (OFF). When the system power supply CS is stopped, the first switch 21a is operated. Is opened (OFF) and the second switch 21b is closed (ON).

  According to these configurations, when there is a system input (when a normal power flow and a reverse power flow are possible in the system power supply CS that is operating normally), the first switch 21a is closed (ON) and the second switch 21b is turned on. Can be opened (OFF). By these opening / closing switching, the charge / discharge control device 1 and the power control device 4 can be connected to the system power supply CS. Then, at least one of the forward power flow of the system power supply CS, the discharge power output from the charge / discharge control device 1, and the generated power Wc output from the power control device 4 can be supplied to the power load L. In addition, when there is no system input due to a power failure or the like (that is, when the system power supply CS is not operating normally and power cannot be forward or reverse), the first switch 21a is opened (OFF) and the second switch 21b is opened. Can be closed (ON). With these opening / closing controls, the charge / discharge control device 1 can be electrically disconnected from the system power supply CS and operated independently, and the power control device 4 can be operated in an interconnected manner with the independent operation power. Then, at least one of the discharge power output from the charge / discharge control device 1 and the generated power Wc output from the power control device 4 can be supplied to the power load L. In particular, when there is no system input, a part of the generated power Wc can be supplied to the power load L and the other part of the power storage device B can be charged during a period in which the power generation device PV can generate power (daytime in good weather, etc.) During a period when the power generation device PV cannot generate power (at night, during bad weather, etc.), the power storage device B can be discharged and the discharge power can be supplied to the power load L. That is, it is possible to effectively use the electric energy charged during a period during which power generation can be performed during a period during which power generation cannot be performed. Therefore, power can be supplied to the power load L even when the operation of the system power supply CS is stopped.

  The open / close switching unit 2 configured as described above is useful because it can be easily added to an existing power system at low cost.

  According to this embodiment, when the system power supply CS that has been stopped is operating normally (that is, when the system power supply CS is restored) in the above open / close switching unit 2, the system power supply CS returns to the normal operation. The first switch 21a is closed (ON) after a predetermined period has elapsed. Further, the predetermined period is equal to or longer than the legal time.

  With respect to this configuration, the legal grid connection regulation prohibits the combined power generation system 100 from being linked to the grid power supply CS within a certain period from the restoration of the grid power supply CS. Therefore, according to the above configuration, by providing a time difference between the time when the system power supply CS is restored and the closing (ON) of the first switch 21a, the power control device 4 is connected with a predetermined time from that time. System operation can be started. Therefore, the power control device 4 can be used in accordance with the legal grid connection regulations.

Second Embodiment
Next, a second embodiment will be described. In the second embodiment, a switch 21c is provided between the energization path 22b and the connection point d in the switching panel 2. Hereinafter, a configuration different from the first embodiment will be described. Moreover, the same code | symbol is attached | subjected to the structure part similar to 1st Embodiment, and the description may be abbreviate | omitted.

  FIG. 3 is a block diagram illustrating a second configuration example of the composite power system 100. As shown in FIG. 3, the switching board 2 further includes a switch 21c. One end of the switch 21c is connected to the wiring P5 at the connection point d via the energization path 22e, and the other end is connected to the energization path 22b via the energization path 22f. The opening / closing operation of the switch 21c is controlled by the switching control unit 153 of V2H-PCS1.

  Next, opening / closing control of the switches 21a to 21c of the switching panel 2 will be described. FIG. 4 shows another example of opening / closing control of the switching panel 2. As shown in FIG. 4, the opening / closing of the switches 21 a to 21 c of the switching panel 2 is controlled according to whether or not the system power supply CS is operating normally and the SOC (state of charge) of the power storage device B.

(When system power supply CS is operating normally)
First, a description will be given of a case where the normal power supply from the system power supply CS and the output of the reverse power supply to the system power supply CS can be performed normally. For example, this is a case where the system power supply CS has not failed. In this case, as in the first embodiment (see FIG. 2), the switch 21a and the interconnection relay 11a of the switching panel 2 are closed (ON), and the switch 21b and the self-supporting relay 11b are opened (OFF). The switch 21c is normally closed (ON), and power control similar to that of the first embodiment can be performed.

(When system power supply CS is not operating normally)
Next, a description will be given of a case where the normal power supply from the system power supply CS and the output of the reverse power supply to the system power supply CS cannot be performed normally. For example, this is a case where the system power supply CS is interrupted due to a lightning strike or equipment failure. In addition, as an exception, a case where the user intentionally shuts down (disconnects) the composite power system 100 from the system power supply CS even when the system power supply CS is operating normally is included. In these cases, as in the first embodiment (see FIG. 2), the switch 21a of the switching board 2 is opened (OFF) and the switch 21b is closed (ON).

  At this time, if the amount of generated power Wc is larger than the consumed power WL of the power load L, a part of the generated power Wc output from the PV-PCS 4 is supplied to the power load L, but the remaining part is The power storage device B can be charged. However, if V2H-PCS1 continues the control of charging the generated power Wc to the power storage device B for a relatively long time, the charging is continued even if the SOC (state of charge) of the power storage device B reaches full charge. There is a risk of overcharging. In order to prevent this, for example, when the SOC (state of charge: charge rate) reaches a threshold value (for example, 90%), the switch 21c of the switching panel 2 is opened (OFF). By doing so, the operation of the PV-PCS 4 can be stopped and charging of the power storage device B can be temporarily stopped.

  Note that, when the system power supply CS that has been stopped is restored, the combined power generation system 100 (or PV-PCS4) is interconnected with the system power supply CS within a certain period from the time when the system power supply CS is restored. Prohibited by legal grid connection regulations. Therefore, as described above, if the opening / closing of the switches 21a to 21c of the switching panel 2 is set, normal operation of the system power supply CS is resumed during the period when the V2H-PCS1 is operating independently (for example, from a power failure) Even in the case of recovery), the PV-PCS 4 can be prevented from being immediately connected to the grid power supply CS by opening (OFF) the switch 21c. Therefore, it is possible to comply with legal grid connection regulations.

  As described above, according to the present embodiment, the open / close switching unit 2 further includes the third switch 21c having one end connected to the output end c of the power control device 4 and the other end connected to the second energization path 22b. Is done.

  According to this configuration, the electrical connection and disconnection of the power control device 4 with respect to the system power supply CS, the charge / discharge control device 1, and the power load L can be switched according to the opening and closing of the third switch 21c.

  Further, according to the present embodiment, in the open / close switching unit 2 described above, the third switch is closed (ON) if the charge amount of the power storage device B is less than the upper limit threshold value, and the charge amount reaches the upper limit threshold value. It is configured to be opened (OFF). Regarding the upper limit threshold, the upper limit threshold for opening (ON) and the threshold for closing (OFF) are not necessarily the same.

  According to this configuration, when the charge amount of the power storage device B reaches the upper limit threshold, the third switch 21c is opened (OFF), so that the generated power Wc is not supplied to the charge / discharge device 1. Therefore, when the generated power Wc is charged in the power storage device B, overcharging of the power storage device B due to excessive supply of the generated power Wc can be prevented.

  Further, according to the present embodiment, in the above open / close switching unit 2, when the system power supply CS that has been stopped operates normally (that is, when the system power supply CS is restored), the system power supply CS returns to the normal operation. The third switch 21c is closed (ON) after a predetermined period of time has elapsed.

  With respect to this configuration, the legal grid connection regulation prohibits the power generation system from being linked to the grid power supply CS within a certain period from the restoration of the grid power supply CS. Therefore, according to the above configuration, by providing a time difference between the time when the system power supply CS is restored and the closing (ON) of the third switch 21c, the power control device 4 is connected with a predetermined time from that time. System operation can be started. Therefore, the power control device 4 can be used in accordance with the legal grid connection regulations.

  Further, according to the present embodiment, in the above-described opening / closing switching unit 2, at least one opening / closing of the first switch 21a, the second switch 21b, and the third switch 21c is based on the charge amount (or SOC) of the power storage device B. It is set as the structure controlled.

<Third Embodiment>
Next, a third embodiment will be described. In 3rd Embodiment, V2H-PCS1 is comprised including the switch board 2. As shown in FIG. Hereinafter, a configuration different from the first and second embodiments will be described. Moreover, the same code | symbol is attached | subjected to the component similar to 1st and 2nd embodiment, and the description may be abbreviate | omitted.

  FIG. 5 is a block diagram illustrating a third configuration example of the composite power system 100. As shown in FIG. 5, the switching board 2 is incorporated in V2H-PCS1. The input / output terminal A connected to the bidirectional inverter 12 via the interconnection relay 11a is the input / output terminal A for system interconnection operation of the bidirectional inverter 12, and is connected to the wiring P1 via the wiring P3. It is connected. The input / output terminal B connected to the bidirectional inverter 12 via the self-supporting relay 11b is the input / output terminal B for self-sustaining operation of the bidirectional inverter 12, and the switch 21b is connected via the wiring P4 and the energizing path 22c. And connected.

  Since the switching board 2 is mounted on the V2H-PCS1 in FIG. 5, it is possible to easily add a power generation system using renewable energy such as the PV-PCS4 to which the solar cell string PV is connected and connect it to the V2H system. it can. Therefore, it is possible to effectively reduce the number of steps in the installation work when the power generation system is incorporated into a stationary power storage system such as the V2H system. By incorporating the switching board 2 in the same housing as the V2H-PCS1, it becomes possible to simplify the wiring around the connection points a to d of the switching board 2.

  As described above, according to the present embodiment, the charge / discharge control device 1 includes the open / close switching unit 2 provided between the system power supply CS and the power load L, and the charge / discharge control unit (12) that performs charge / discharge control of the power storage device B. , 152) and a switching control unit 153 for controlling the opening / closing switching unit 2, and the switching unit 2 connects the power line P1 to which the first input / output terminal A of the charge / discharge control unit (12, 152) is connected. A first energizing path 22a connected to the system power supply CS, a second energizing path 22b connected to the power load L, one end connected to the first energizing path 22a, and the other end to the second energizing path 22b. A first switch 21a connected to the second switch 21b, one end connected to the second input / output terminal B of the charge / discharge control unit (12, 152), and the other switch 21b connected to the second energizing path 22b. , And the second energization path 22b further includes a power generator P. It is configured to output terminal C of the power control device 4 for performing power control is connected.

  According to this configuration, when there is a system input (when a normal power flow and a reverse power flow are possible in the system power supply CS that is operating normally), charge / discharge control is performed by switching the first switch 21a and the second switch 21b. The device 1 can be interconnected with the power control device 4 and the system power supply CS. Then, at least one of the forward power flow of the system power supply CS, the discharge power output by the charge / discharge control unit (12, 152), and the generated power Wc output from the power control device 4 can be supplied to the power load L. . In addition, when there is no system input due to a power failure or the like, the charge / discharge control device 1 is electrically disconnected from the system power source CS and operated independently by switching the first switch 21a and the second switch 21b to open and close the power control device 4. It is possible to perform a linked operation with the autonomous power. Then, at least one of the discharge power output from the charge / discharge control unit (12, 152) and the generated power Wc output from the power control device 4 can be supplied to the power load L. In particular, when there is no system input, the charge / discharge control device 1 supplies a part of the generated power Wc to the power load L during a period during which the power generator PV can generate power (daytime in fine weather, etc.) and the other part. During a period when the power storage device B can be charged and the power generation device PV cannot generate power (at night, during bad weather, etc.), the power storage device B can be discharged and discharge power can be supplied to the power load L. That is, it is possible to effectively use the electric energy charged during the period during which power generation is possible during the period during which power generation cannot be performed. Therefore, the charge / discharge control device 1 can supply power to the power load L even when the operation of the system power supply CS is stopped.

  The embodiment of the present invention has been described above. The above-described embodiment is an exemplification, and various modifications can be made to the combination of each component and each process, and it will be understood by those skilled in the art that it is within the scope of the present invention.

  For example, in the above-described first to third embodiments, at least a part or all of the functional components of the CPU 15 may be components different from the CPU 15, and physical components (for example, (Electric circuit, element, device, etc.).

  Moreover, in the above-mentioned 1st-3rd embodiment, V2H-PCS1 is a charging / discharging control apparatus for V2H systems, but this invention is not limited to this illustration. V2H-PCS1 may be a charge / discharge control device for a charge / discharge system other than V2H. For example, V2H-PCS1 may be applied to a charge / discharge system including an EV charger, a PHEV charger, a quick charger, and the like, and a charge / discharge system including a stationary lithium ion power storage device.

100 Combined power system 1 Power conditioner for V2H system (V2H-PCS)
11a Linkage relay 11b Self-supporting relay 12 Bidirectional inverter 13 Communication unit 14 Storage unit 15 CPU
151 Power monitoring unit 152 Conversion control unit 153 Switching control unit 154 Management unit 2 Switching panel 21a to 21c Switch 22a to 22f Current path 3 Distribution panel 31 Main breaker 32 Branch breaker 4 Power conditioner (PV-PCS) for power generation system
41 Inverter 42 Communication unit 43 Memory 44 CPU
PV Solar cell string EV Electric vehicle B Power storage device L Electric power load CS System power supply

Claims (5)

An open / close switching unit provided between the system power supply and the power load,
A first input / output terminal of a charge / discharge control device that performs charge / discharge control of the power storage device, and a first current path connected to the system power supply;
A second energization path connected to the power load;
A first switch having one end connected to the first current path and the other end connected to the second current path;
A second switch having one end connected to the second input / output end of the charge / discharge control device and the other end connected to the second energization path;
An open / close switching unit to which the output terminal of a power control device that performs power control of the power generation device is further connected to the second energization path. When the system power supply is operating normally, the first switch is closed and the second switch is opened,
2. The open / close switching unit according to claim 1, wherein when the system power supply is stopped, the first switch is opened and the second switch is closed.   The open / close switching unit according to claim 1 or 2, further comprising a third switch having one end connected to the output end of the power control device and the other end connected to the second energization path. An open / close switching unit provided between the system power supply and the power load;
A charge / discharge control unit that performs charge / discharge control of the power storage device;
A switching control unit for controlling the open / close switching unit,
The opening / closing switching unit is
A first energization path connected to the system power supply via a power line to which a first input / output terminal of the charge / discharge control unit is connected
A second energization path connected to the power load;
A first switch having one end connected to the first current path and the other end connected to the second current path;
A second switch having one end connected to the second input / output end of the charge / discharge control unit and the other end connected to the second energization path;
The charging / discharging control apparatus to which the output terminal of the electric power control apparatus which performs electric power control of an electric power generating apparatus is further connected to the said 2nd electricity supply path. A charge / discharge control device that performs charge / discharge control of the power storage device; and
An open / close switching unit having a first switch and a second switch and provided between a system power supply and a power load;
A switching control unit for controlling the open / close switching unit;
A power control device that performs power control of the power generation device,
The charge / discharge control device has a first input / output terminal connected to a power line electrically connected to a system power supply, and a second input / output terminal connected to one end of the second switch,
One end of the first switch is connected to the power line,
The other end of the first switch is connected to the other end of the second switch via an energization path;
The power control device has an output end connected to the energization path;
The switching control unit
When the system power supply is operating normally, the first switch is closed and the second switch is opened,
A switching control system that opens the first switch and closes the second switch when the system power supply is stopped.

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