JP6373016B2 - DC power supply system, power supply device, power supply control method and program in DC power supply system - Google Patents

Description

  The present invention relates to a DC power supply system that supplies power to a load device connected to a DC voltage power supply path, a power supply device, a power supply control method in the DC power supply system, and a program.

  In recent years, in data centers, communication stations, and the like, construction of a DC power supply system that supplies DC power to various load devices such as routers and servers has been promoted. This DC power supply system converts a commercial AC power into a DC power having a predetermined voltage by a DC power supply device having an AC power system (commercial power system) as an input, and a plurality of loads via a power supply path (power supply line). Supply to the device.

  In this DC power supply system, an AC power system is used as a power source. In the event that an abnormality such as a system fault occurs in the AC power system and a DC voltage cannot be normally output from the DC power supply device to the load device, a fuel cell, an engine generator, or the like may be provided as a power backup. . The above fuel cell, engine generator, and the like require fuel for power generation.

  On the other hand, the solar power generation device can generate power without the need for fuel and can be used as a backup power source. Such a solar power generation device is used in combination with a power conditioner (Power Conditioning Subsystem) that converts electric power generated by itself. This power conditioner (sometimes simply referred to as “PCS” in the following description) boosts (or steps down) the output voltage of the photovoltaic power generator and supplies it to the power feeding path of the power feeding system. A control function is provided for controlling the output power in accordance with the amount of power generated by the power generation device or the like. It has also been proposed to use the solar power generation device and the power storage device to supply power to the load device.

  For example, there is a power control device disclosed in Patent Document 1. In the power control device described in Patent Document 1, a consumer includes a solar power generation device including a solar battery and a power storage device including a storage battery. Electric power is selectively supplied from the power supply system, the solar power generation device, and the power storage device to the electric load of the consumer.

JP 2012-152093 A

  By the way, when the PCS described above is connected to a power supply path (power supply line) from the DC power supply device and connected to the output of the DC power supply device, the PCS detects the voltage of the power supply path. For this reason, when power is not supplied to the power supply path due to a power failure of the commercial power system that hits the power source of the DC power supply device or a failure of the DC power supply device, the PCS cannot detect a voltage for operating itself. In that case, the PCS continues the operation by switching the operation state linked to the output of the DC power supply device to the independent operation. The PCS can supply power to the power feeding path within the range of the current capacity that can be supplied in this self-sustaining operation state. However, if the current capacity flowing through the load device is greater than the current capacity that can be supplied from the PCS, or if the solar power generation device cannot obtain a predetermined amount of sunshine, the output power of the solar power generation device decreases from the PCS. When the current capacity that can be supplied decreases, the PCS cannot continue to operate. Once the output of the PCS has been stopped, there is a problem that even if the above case is resolved, the voltage cannot be output to the power feeding path until the operating voltage for starting the PCS is supplied.

  The present invention has been made in view of such circumstances, and in a power failure state in which an operating voltage that enables operation from the interconnected power supply system to the power conditioner of the photovoltaic power generation apparatus is not supplied, the photovoltaic power generation apparatus In a DC power supply system, a power supply device, and a DC power supply system that can supply power to a power supply path by activating the power conditioner while the power conditioner is stopped and outputting power to the power supply path A power supply control method and program are provided.

The present invention has been made to solve the above-described problem, and a DC power supply system according to the present invention includes a load device connected to a power supply path of a DC power supply device that outputs a DC voltage from the DC power supply device to the load device. A DC power supply system that supplies power through a power supply path, and a solar power generation device is connected to the power supply path via a power conditioner, and supplies power from the solar power generation device to the power supply path, from said photovoltaic device to the power conditioner in a stopped state, which stops the supply of power to the power supply path, a power supply device for supplying a reference voltage of a voltage to force the power conditioner is out, the power supply unit, the commercial electric power system is a power failure will have the stopped state the power conditioner, and, from said photovoltaic device to said electric power supply path Even if capable of supplying power, when said reference voltage is not supplied to the power conditioner from the DC power supply, and supplies the reference voltage to the power conditioner without passing through the feed path the It is characterized by starting the inverter.

  In the DC power supply system, the power supply path includes a switch unit disposed at a location that divides a power supply range that supplies power from the photovoltaic power generation apparatus and a non-power supply range that does not supply power. The power supply device is characterized in that a power supply range in the power supply path is set by transmitting a switch control signal to the switch unit and controlling an open / closed state of the switch unit by the switch control signal.

Furthermore, activation in the DC power supply system, the power supply device, when the reference voltage is not supplied to the power conditioner, the power conditioner by supplying the reference voltage to the power conditioner of the photovoltaic device A power conditioner starting unit, a switch control signal that transmits a switch control signal to the switch unit, and controls an open / closed state of the switch unit by the switch control signal, and a setting that sets an open / closed state of the switch unit An input unit, wherein the switch control unit controls the open / close state of the switch unit based on setting information of the open / close state of the switch unit set in the setting input unit.

  In the DC power supply system, the switch unit may be configured to open and close a switch based on a switch control signal receiving unit that receives the switch control signal from the power supply device and a switch control signal received by the switch control signal receiving unit. And a switch opening / closing section for performing the above.

  In the DC power supply system, the switch unit may include a semiconductor switching element for connecting and disconnecting the power supply path.

The power supply device of the present invention supplies power from the DC power supply device to the load device connected to the power supply path of the DC power supply device that outputs a DC voltage via the power supply route, and the photovoltaic power generation device A power supply device in a DC power supply system that is connected to the power supply path via a power conditioner and supplies power to the power supply path from the solar power generation apparatus, the power from the solar power generation apparatus to the power supply path supplied to the power conditioner stop state is stopped, and the power conditioner supplies a reference voltage of the voltage to be force out, the power conditioner the commercial electric power system is a power failure becomes the stopped state and, wherein the photovoltaic device in a case that electric power can be supplied to the power supply path, the said reference voltage from said DC power supply apparatus Pawako If not supplied in conditioners, and wherein the activating the power conditioner by supplying the reference voltage to the power conditioner without passing through the feed path.

Further, the power supply control method in the DC power supply system of the present invention supplies power from the DC power supply device to the load device connected to the power supply route of the DC power supply device that outputs a DC voltage via the power supply route. A power supply control method in a DC power supply system in which a photovoltaic power generation apparatus is connected to the power supply path via a power conditioner and supplies electric power from the solar power generation apparatus to the power supply path. the supply of power to the path to the power conditioner stop state is stopped, includes a power supply step of supplying a reference voltage of a voltage to force the power conditioner is out, further, the power supply step, the power conditioner the commercial electric power system is a power failure becomes the stopped state, and the power feeding path from the photovoltaic device A if the power supply is capable of, when said reference voltage is not supplied to the power conditioner from the DC power supply, and supplies the reference voltage to the power conditioner without passing through the feed path The method includes a step of starting the inverter.

In addition, the program of the present invention supplies power from the DC power supply device to the load device connected to the power supply path of the DC power supply device that outputs a DC voltage via the power supply route, and the photovoltaic power generator is in power condition. A DC power supply system that is connected to the power supply path via a power source and supplies power from the solar power generation apparatus to the power supply path, and stops supplying power from the solar power generation apparatus to the power supply path. the power conditioner stop state are, to a computer in the power supply device in the DC power supply system including a power supply device for supplying a reference voltage of a voltage to force the power conditioner is out, is the commercial electric power system outage When the power conditioner is in the stopped state and power can be supplied from the photovoltaic power generation device to the power supply path. A is, if the reference voltage is not supplied to the power conditioner from the DC power supply device, the step of activating the power conditioner by supplying the reference voltage to the power conditioner without passing through the feed path Is a program for executing

  According to the power supply control method and program in the DC power supply system and DC power supply system of the present invention, in a power failure state in which the operating voltage that enables operation from the interconnected power supply system to the power conditioner of the photovoltaic power generator is not supplied, After the power conditioner of the solar power generation apparatus stops outputting, the power conditioner can be activated while being in the power outage state to supply power to the power feeding path.

It is a lineblock diagram showing a schematic structure of direct-current power feeding system 1 concerning an embodiment of the present invention. It is a block diagram which shows the structure of a switch part. It is a block diagram which shows the structural example of PCS5 and the power supply device 6. FIG. It is explanatory drawing which shows the example of the switch control signal CNT. It is a flowchart which shows the procedure of the starting process of PCS5. It is a flowchart which shows the 1st modification of the procedure of the starting process of PCS5. It is a flowchart which shows the 2nd modification of the procedure of the starting process of PCS5. 6 is an explanatory diagram illustrating an example of a control panel 63. FIG. It is a block diagram which shows the structural example of the control circuit of a switch part. It is a flowchart which shows the procedure of the electric power supply process in a DC power supply system. FIG. 3 is a configuration diagram showing a schematic configuration of a modification of the DC power supply system 1. It is a flowchart which shows the procedure of the starting process of PCS5 in DC power supply system 1A.

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

(Schematic configuration of DC power supply system 1)
FIG. 1 shows a schematic configuration of a DC power supply system 1 according to an embodiment of the present invention. The DC power supply system 1 is an example of a DC power supply system installed in a building such as a data center or a communication station.

A DC power supply system 1 shown in FIG. 1 includes a power receiving facility 2, a DC power supply (REC) 3, a power supply path to a load device, switch units 101 to 116, a photovoltaic power generation device (PV) 4, and a power conditioner (PCS). 5, a power storage device (BATT) 7, a PCS 8, and a power supply device 6.
The power receiving facility 2 includes a circuit breaker (CB) 2A, a transformer 2C, and a protective relay 2D. The protective relay 2D includes, for example, an overcurrent relay, a ground fault relay, an undervoltage relay (all not shown) and the like, and when these relays detect an abnormal state according to each detection condition, The signal is sent to the circuit breaker 2A to open the circuit breaker 2A.
For example, the overcurrent relay opens the circuit breaker 2A when it detects that an overcurrent has flowed through the circuit, and the ground fault relay breaks down when it detects that a ground fault has occurred in the circuit or equipment. When the undervoltage relay detects that the commercial power cannot be received from the commercial power system PS due to a power failure or an accident, the undervoltage relay opens the breaker 2A.

The circuit breaker 2A is provided with an auxiliary contact 2B mechanically interlocked with the main contact, and the open / closed state of the auxiliary contact 2B will be described later as a contact signal Aux indicating the open / closed state of the circuit breaker 2A. It is output to the power supply device 6. That is, the DC power supply system 1 can detect from the contact signal Aux that the commercial power cannot be received from the commercial power system PS due to a power failure or an accident.
In addition, as a method for detecting that the commercial power system PS has a power failure, for example, a voltage sensor (voltage detection relay) is provided on the secondary side of the transformer 2C, and the commercial power system PS has a power failure due to this voltage sensor. May be detected.
In addition, a voltage sensor and a voltage detection circuit for detecting that the commercial power system PS has failed are provided in the DC power supply device 3 to detect that the commercial power system PS has been interrupted by this voltage sensor and voltage detection circuit. Also good.

  The transformer 2C steps down a high-voltage AC voltage (for example, three-phase AC 6600V) supplied from the commercial power system PS to a predetermined low-voltage AC voltage (for example, three-phase AC 400V), and converts the low-voltage AC voltage to a DC power supply (REC). ) 3 is supplied. The DC power supply device 3 is a rectifier that converts commercial AC power into DC power, and converts the low-voltage AC voltage input from the transformer 2C into a DC voltage of a predetermined voltage. For example, the DC power supply device 3 is an AC / DC converter, and outputs a DC voltage of 380 V to power supply paths P11 and N11 that are main power supply lines.

A solar power generation device 4 is connected to the power feeding paths P11 and N11 via a power conditioner (PCS) 5 and a switch unit 101. The switch unit 101 includes a switch for connecting / opening between the PCS 5 of the photovoltaic power generation device 4 and the power feeding paths P11 and N11. When the switch unit 101 is in the connected state, the PCS 5 is connected to the DC power supply device 3. Enables linkage to the output of.
A power storage device (BATT) 7 including a storage battery is connected to the power supply paths P11 and N11 via the PCS 8 and the switch unit 102. The switch unit 102 includes a switch for connecting / opening between the PCS 8 of the power storage device 7 and the power feeding paths P11 and N11. When the switch unit 102 is in a connected state, the switch 8 is connected to the output of the DC power supply device 3. Enable to connect to
Moreover, the switch part 111 to the switch part 116 includes a switch for opening and closing the electric circuit in the power supply paths P28 and N28 from the power supply paths P21 and N21. Further, the power supply paths P11 and P21 to the power supply path P28 indicate positive-side power supply lines, and the power supply paths N11 and N21 to the power supply path N28 indicate negative-electrode-side power supply lines.
In the following description, the switch units 101 and 102 and the switch units 111 to 116 are collectively referred to as “switch unit 100”.

  In addition, the power storage device 7 is charged by the power from the DC power supply device 3 via the PCS 8 at normal times when the output of the DC power supply device 3 is not in a power failure state in which the output is stopped. When the power storage device 7 is in a power failure state in which the output of the DC power supply device 3 is stopped (hereinafter referred to as “at the time of a power failure of the DC power supply device 3”), the stored power is supplied via the PCS 8 to the power supply path P11. And N11. Note that the PCS 8 can also perform charge / discharge control of the power storage device 7 for the purpose of peak cut of electric power used in normal times.

  The solar power generation device (PV) 4 includes a solar cell array (solar cell) 4a. The solar cell array 4a converts solar energy into electricity and outputs the electricity to the PCS 5. The PCS 5 supplies the power generated by the solar power generation device 4 to the power supply paths P11 and N11 and supplies the power from the DC power supply apparatus 3 to the power supply paths P11 and N11 at the normal time when the DC power supply 3 supplies DC power. Reduce the amount of power used. Further, when a power failure occurs in the DC power supply device 3, the PCS 5 receives a signal indicating that this power failure has occurred from the DC power supply device 3 and the like, and temporarily stops its operation. Thereafter, power supply is started from the PCS 8 of the backup power storage device 7 to the power supply paths P11 and N11. Eventually, the charge accumulated in the power storage device 7 is insufficient or exhausted, and the power supply path P11 When power cannot be supplied to N11, the PCS 5 starts again.

That is, the PCS 5 is activated when power cannot be supplied from the power storage device 7 to the power supply paths P11 and N11 during a power failure of the DC power supply device 3, and the power generated by the solar power generation device 4 is supplied to the power supply paths P11 and N11. Supply.
In this way, the solar power generation device 4 supplies power to a load device that needs to be supplied in a state where power cannot be supplied from both the DC power supply device 3 and the power storage device 7. For example, power is supplied to a lighting device or the like. Details of the PCS 5 will be described later.

In the above-described example of starting the PCS 5, when a power failure occurs in which power cannot be supplied from the commercial power system PS to the DC power supply device 3, the PCS 5 temporarily stops operating, and the charge of the power storage device 7 is insufficient or depleted. Although an example in which the PCS 5 is restarted when the state is reached is shown, other startup methods can be used. For example, after a power failure occurs in which power cannot be supplied from the commercial power system PS to the DC power supply device 3 and the PCS 5 is temporarily stopped, the power supply device 6 detects the bus voltage (voltages of the power supply paths P11 and N11). If the bus voltage is within the operating voltage range, for example, within ± 10% of the rated voltage, the PCS 5 may be restarted. Details of this activation method will be described later.
Furthermore, in the DC power supply system 1, when it is detected that the power supply paths P11 and N11 serving as power supply buses are below a predetermined voltage value, for example, zero voltage, without receiving a signal indicating a power failure of the commercial power system PS. In addition, the operation of the PCS 5 may be stopped. Details of this activation method will be described later.

The switch unit 101 connected to the PCS 5 is in an open (off) state when a failure (for example, a short circuit between lines) occurs in the system of the power supply paths P11 and N11, and the solar power generation device 4 is disconnected from the system. Separate. In addition, the switch unit 101 is assumed to be in an open (off) state even during a power failure of the DC power supply device 3.
In addition, the switch unit 102 connected to the PCS 8 is opened (off) when a failure occurs in the power supply paths P11 and N11, and separates the power storage device 7 from the system. The switch unit 102 is in a closed (on) state in a normal case where no failure has occurred in the power supply paths P11 and N11.
When the PCS 5 of the solar power generation device 4 and the PCS 8 of the power storage device 7 have a protection function that cuts off the output current when a failure occurs in the power supply paths P11 and N11, the switch units 101 and 102 are omitted. It is also possible to do.

  The power supply paths P11 and N11 are connected to the input side of the distribution board (PDF) 11, and the DC power supply 3 is connected to the power supply paths P21 and N21 via the distribution board 11 from the power supply paths P28 and N28. Electric power is supplied from each load device L11 arranged in the system to the load device L16. Each of the load devices L11 to L16 is a device that operates with DC power supplied from the DC power supply device 3. For example, the load devices L11 to L16 are DC appliances, LED lighting, information devices such as personal computers and servers, and the like. In addition, a switch unit 116 to a switch unit 116 for setting a power supply range for supplying power from the load device L11 to the load device L16 are arranged at predetermined positions in the power supply routes P21 and N21 to the power supply routes P28 and N28. Yes. That is, the switch unit 111 to the switch unit 116 are arranged in the power supply path at a location that divides the power supply range for supplying power from the solar power generation device 4 and the non-power supply range for not supplying power.

  The power supply path will be described in more detail. The power supply paths P11 and N11 are connected to the input side of the distribution board (PDF) 11, and an overcurrent breaker (not shown) in the distribution board 11 is used. The branch circuit branches into power supply paths P21 and N21 and power supply paths P24 and N24. The power feeding paths P21 and N21 are connected to the power feeding paths P22 and N22 via the switch unit 111, and the load device L11 is connected to the power feeding paths P22 and N22. Further, the power feeding paths P23 and N23 are branched from the power feeding paths P22 and N22 via the switch unit 112, and the load device L12 is connected to the power feeding paths P23 and N23.

On the other hand, the power feeding paths P24 and N24 branched from the distribution board 11 are branched to the power feeding paths P25 and N25 via the switch unit 113, and the load device L13 is connected to the power feeding paths P25 and N25. The power feeding paths P24 and N24 are branched to the power feeding paths P26 and N26 via the switch unit 114, and the load device L14 is connected to the power feeding paths P26 and N26. The power feeding paths P26 and N26 are branched to the power feeding paths P27 and N27 via the switch unit 115, and the load device L15 is connected to the power feeding paths P27 and N27. The power feeding paths P26 and N26 are branched to the power feeding paths P28 and N28 via the switch unit 116, and the load device L16 is connected to the power feeding paths P28 and N28.
Note that the switch unit 111 to the switch unit 116 are necessary for the entire system from the power storage device 7 when a power failure occurs in the DC power supply device 3 and thereafter the charge stored in the backup power storage device 7 is insufficient or depleted. When it becomes impossible to supply a sufficient power, it is assumed to be in an open (off) state. And after starting PCS5 of the solar power generation device 4, the open / close state of the switch unit 116 is controlled from the switch unit 111, so that the power supply range can be expanded sequentially.

  FIG. 2 is a configuration diagram illustrating the configuration of the switch unit. The switch unit 100 uses a double-throw contact (two contacts) like the switch SW shown in FIG. 2A to connect or open each of the positive-side feed line P and the negative-side feed line N. It is configured. Note that the switch unit 100 connects or connects only the positive-side power supply line P (or the negative-electrode side power supply line N) using a single throw contact (one contact), like the switch SW shown in FIG. You may make it open. Further, as shown in FIG. 2C, the switch unit 100 includes a first direction switch SWa, a second direction switch SWb, and a contact point of the third direction switch SWc, which are connected to each other in any of the three directions. It may be a T-type switch that can output a voltage input from the other direction in the other two directions or one direction.

  1 and 2 show an example of a switch using a mechanical contact as the switch unit 100. In practice, the switch SW is a semiconductor switching element such as an IGBT (Insulated Gate Bipolar Transistor). It is comprised by the used semiconductor switch. This semiconductor switch is configured to connect and shut off the power supply path, supply DC current to the power supply path and load device of the supply destination when connected, and have the ability to cut off the load current flowing to the load device when cut off Has been. The configuration of the switch unit 100 will be described later.

Returning to FIG. 1, the power supply device 6 cannot supply power to both the power supply paths P <b> 11 and N <b> 11 from both the DC power supply device 3 and the power storage device 7 during the power failure of the DC power supply device 3. When the voltage on the output side) disappears, the PCS 5 is supplied with an operating voltage serving as a reference for starting the PCS 5, and the PCS 5 is started independently. That is, the power supply device 6 supplies the operation voltage to be output from the PCS 5 to the PCS 5 in the stopped state in which the output is stopped, and starts the PCS 5 independently.
The state in which power is not supplied from the DC power supply device 3 to the power supply paths P11 and N11 is when the commercial power system PS fails, when the DC power supply device 3 fails, or when the power supply paths P11 and N11 are in an accident. Occurs when shut off due to the above.
In addition, the state where power is not supplied from the power storage device 7 to the power feeding path occurs when the amount of power stored in the power storage device 7 decreases or when the PCS 8 of the power storage device 7 stops supplying power. Note that when the PCS 8 of the power storage device 7 stops supplying power, the PCS 8 is intentionally set even when the power storage amount of the power storage device 7 is not depleted for the purpose of holding the power storage amount of the power storage device 7 or the like. It may be stopped.

In addition, after the PCS 5 is activated, the power supply device 6 transmits a switch control signal CNT to the switch unit 100 that is once opened, and controls the open / close state of the switch unit 100. Thereby, the power supply device 6 supplies power from the solar power generation device 4 to the power feeding paths P11 and N11, and controls the power feeding ranges in the power feeding paths P28 and N28 from the power feeding paths P21 and N21.
That is, the power supply device 6 adjusts the power supply range from the power supply paths P21 and N21 to the power supply paths P28 and N28 by controlling the open / close state of the switch section 116 from the switch section 111. Thereby, when the power supply device 6 cannot supply power from both the DC power supply device 3 and the power storage device 7, the load device used during a power failure (for example, a lighting device) supplies power from the solar power generation device 4. And a load device (for example, an air conditioner) that does not supply power can be selected.

  In this way, the power supply device 6 supplies the operating voltage to the PCS 5 when the operating voltage that enables the PCS 5 to stop and output power from the PCS 5 is not supplied from the DC power supply device 3 to the PCS 5. Then, the PCS 5 is activated. Furthermore, the power supply device 6 transmits a switch control signal to the switch unit 100, and controls the open / closed state of the switch unit 100 by the switch control signal. Thereby, the power supply device 6 sets the power supply range in the power supply path.

(Configuration of PCS 5 of solar power generation device 4 and power supply device 6)
FIG. 3 is a configuration diagram illustrating a configuration example of the PCS 5 and the power supply device 6 of the solar power generation device 4. As shown in FIG. 3, the PCS 5 includes a power generation amount control unit 51, a grid interconnection control unit 52, and a DC / DC converter 53.

In order to extract the maximum power from the solar power generation device 4, the power generation amount control unit 51 has an operating point (maximum) that maximizes the output of the solar cell array 4a in the IV (current-voltage) characteristics of the solar cell array 4a. Power point). In the solar cell array 4a, the maximum power point is shifted depending on the voltage actually required by the connected load. Since the IV characteristic changes depending on the solar radiation intensity, the module temperature, the state, etc., in order to obtain the maximum power, the optimum voltage or current must be automatically followed. In addition, the power generation amount control unit 51 notifies the power supply device 6 that the power that can be output from the solar power generation device 4 is “information on whether or not the power is greater than or equal to a predetermined value”. This “information on whether or not the power that can be output from the solar power generation device 4 is equal to or greater than a predetermined value” is used as a start condition when the power supply device 6 restarts the PCS 5 that has once stopped operating. It is done.
Further, the grid interconnection control unit 52 detects the voltages of the power feeding paths P11 and N11 serving as power feeding buses, and adjusts the output voltage of the DC / DC converter 53, thereby connecting to the power feeding paths P12 and N12. And control so that the power output from the PCS 5 can be fed. The DC / DC converter 53 is a converter for boosting (or stepping down) the output voltage of the solar power generation device 4 and supplying power to the power feeding paths P11 and N11.

The power supply device 6 includes a PCS activation unit 61, a bus voltage detection unit 61 </ b> A, a switch control unit 62, a control panel 63, and a storage battery 64.
The bus voltage detector 61A detects the DC voltage of the power supply paths P11 and N11 that are power supply buses.
When the bus voltage detection unit 61A detects that the PCS activation unit 61 cannot supply power to the power supply paths P11 and N11 from both the DC power supply device 3 and the power storage device 7, and no operating voltage is supplied to the PCS 5. In addition, an operating voltage is supplied to the PCS 5 of the photovoltaic power generation device 4 by the built-in storage battery 64 to activate the PCS 5 independently. Further, the PCS activation unit 61 controls the activation operation and the stop operation of the PCS 5 and also controls the activation operation and the stop operation of the PCS 8.

The switch control unit 62 controls the switch unit 100 according to control from the control panel 63. The switch control unit 62 transmits the switch control signal CNT to the switch unit 101 and closes the switch unit 101 (on state), thereby connecting the photovoltaic power generation apparatus 4 to the power feeding paths P11 and N11 and connecting them. Let In addition, the switch control unit 62 transmits a switch control signal CNT to the switch unit 102 and closes the switch unit 102 (on state), thereby connecting the power storage device 7 to the power feeding paths P11 and N11 and interconnecting them. Let
Further, the switch control unit 62 transmits a switch control signal CNT from the switch unit 111 to the switch unit 116, and controls the open / close state of the switch unit 116 from the switch unit 111.
That is, the switch control unit 62 controls the power supply range in the power supply paths P28 and N28 from the power supply paths P21 and N21 by controlling the open / close state of the switch section 116 from the switch section 111.
For example, when the power storage device 7 cannot supply power to the load devices L11 to L16 at the time of a power failure of the DC power supply device 3, the switch control unit 62 is used at the time of power failure to supply power by the solar power generation device 4. As a load device, a power supply range in the power supply paths P28 and N28 is set from the power supply paths P21 and N21 so that a lighting device or the like is selected and power is supplied.

  FIG. 4 is a diagram illustrating an example of the switch control signal CNT. In the example of the switch control signal CNT shown in FIG. 4, the switch control signal CNT includes “switch identification information” and “on / off (open / close) information” of the switch. By transmitting the switch control signal CNT toward the switch unit 100, the switch unit 100 corresponding to the “switch identification information” turns on / off the switch based on the “on / off (open / close) information”. Open / close operation.

Returning to FIG. 3, a dedicated signal line may be provided as a signal path for transmitting the switch control signal CNT to the switch unit 100, and at least one of the power supply paths P11 and N11, P21 and N21 to P28 and N28. You may make it utilize the electric power feeding path | route of a part as a signal wire | line. When a dedicated signal line is provided, power for operating the switch unit 100 can also be supplied from the power supply device 6 via this signal line.
In addition, when using at least a part of the power supply paths P11 and N11, P21 and N21 to P28 and N28 as signal lines, for example, only when the switch unit 111 is in the ON state, The transmission of the switch control signal CNT to the far side from the switch unit 100 in the off state is restricted according to the open / close (on / off) state of the switch unit 116 from the switch unit 111, such as being able to transmit the switch control signal CNT. Further, when the power feeding path is used as a signal line, the power for operating the switch unit 100 can be supplied from the solar power generation device 4 or the power storage device 7 through the power feeding path.

  In addition, the storage battery 64 in the power supply device 6 is always charged from, for example, power supply paths P11 and N11 in a normal state in which power is supplied from the DC power supply device 3. Then, when the DC power supply 3 is out of power, the power storage device 7 is in a state where it cannot output the electric energy, and when starting up the PCS 5, the storage battery 64 has an operating voltage that causes the power supply device 6 to output power to the PCS 5. The power is supplied to the power supply device 6 to start the operation of the power supply device 6, and the operating voltage is supplied from the power supply device 6 to the PCS 5 to activate the PCS 5 independently. Instead of the storage battery 64, the PCS 5 may be activated independently using a fuel cell or an engine generator.

(PCS5 startup process procedure)
FIG. 5 is a flowchart showing the procedure of the startup process of the PCS 5 at the time of a power failure of the DC power supply system 1.
Hereinafter, with reference to the flowchart shown in FIG. 5, the procedure of the startup process of the PCS 5 in the DC power supply system 1 will be described.
First, it is assumed that a power outage state in which power cannot be supplied from the commercial power system PS to the DC power supply device 3 occurs.
When a power failure occurs in the commercial power system PS, the circuit breaker 2A in the power receiving facility 2 is opened by the operation of an undervoltage relay (not shown) in the protective relay 13, and the auxiliary contact 2B of the circuit breaker 2A is opened. The power supply device 6 detects from the contact signal Aux that the auxiliary contact 2B of the circuit breaker 2A has been opened, and detects that a power failure has occurred in the commercial power system PS (step S100).

  Subsequently, the power supply device 6 controls the PCS 8 of the power storage device 7 to start discharging from the power storage device 7 toward the power feeding paths P11 and N11 (step S105), and temporarily stops the operation of the PCS 5 (step S105). Step S110). Further, the power supply device 6 opens the switch unit 101 (step S115). Thus, when the power supply device 6 detects that a power failure has occurred in the commercial power system PS, the power supply device 6 temporarily stops the operation of the PCS 5 and supplies power from the power storage device 7 to the power supply paths P11 and N11. Can do.

Subsequently, the power supply device 6 determines whether or not the voltage of the power supply paths P11 and N11, which are power supply buses, is reduced to a predetermined voltage value or less (for example, a value near zero voltage) by the bus voltage detection unit 61A. It detects (step S120). That is, after the power storage device 7 starts discharging, has the DC voltage supplied from the power storage device 7 to the power supply paths P11 and N11 decreased to a predetermined voltage value or less due to insufficient or depleted charge of the power storage device 7? The power supply device 6 detects whether or not.
And when it determines with the voltage of the electric power feeding path | routes P11 and N11 having fallen below the predetermined voltage value in the process of step S120 (step S120: Yes), the power supply device 6 will perform the process step of step S130. It shifts and it is determined whether the electric power which can be output from the solar power generation device 4 is electric power more than predetermined value (step S130). That is, it is determined whether or not the solar power generation device 4 is in a state where it can obtain a sunshine amount equal to or greater than a predetermined value and can supply power equal to or greater than the predetermined value from the PCS 5 to the power feeding path. This predetermined value can be set to an arbitrary value, for example, with the amount of power that can supply power to at least one load device as a lower limit value.

Subsequently, in the process of step S130, when it is determined that the photovoltaic power generation apparatus 4 is in a state in which power can be output to the power feeding path (step S130: Yes), the power supply apparatus 6 proceeds to the process step of step S140. Then, the PCS activation unit 61 supplies the PCS 5 with an operating voltage that enables power to be output from the PCS 5 to activate the PCS 5 (step S140).
Subsequently, the power supply device 6 causes the switch control unit 62 to turn on the switch unit 101 to output DC power from the PCS 5 to the power feeding paths P11 and N11 (step S145). And after performing the process of this step S145, the power supply device 6 complete | finishes the starting process of this PCS5.

On the other hand, in the process of step S120, when it is determined that the voltages of the power supply paths P11 and N11 have not decreased below the predetermined voltage value (step S120: No), the power supply device 6 proceeds to the process step of step S110. Returning, the operation stop state of the PCS 5 and the open state of the switch unit 101 are continued.
Moreover, in the process of step S130, when it determines with the solar power generation device 4 not being in the state which can output electric power to an electric power feeding path (step S130: No), the power supply apparatus 6 returns to the process step of step S110, The operation stop state of the PCS 5 and the open state of the switch unit 101 are continued.

  As a result, in the DC power supply system 1, when a power failure state occurs in which power cannot be supplied from the commercial power system PS to the DC power supply device 3, the operation of the PCS 5 is temporarily stopped and the power storage device 7 is connected to the power supply paths P11 and N11. Electric power can be supplied. Thereafter, when the charge accumulated in the power storage device 7 is insufficient or depleted, the power supply device 6 can activate the PCS 5 to supply power from the solar power generation device 4 to the power feeding path.

In addition, after starting PCS5 by step S140, when the switch part 101 is turned on in step S145, if there is a possibility that excessively large current flows from the PCS5 toward the power supply paths P11 and N11, The switch unit 101 may be turned on, and then the output voltage of the PCS 5 may be raised. For example, after the switch unit 101 is turned on, the output voltage of the PCS 5 may be gradually raised to prevent a transient excessive current from flowing.
Furthermore, when the DC power supply 3 is out of power, the switch unit 101 is closed without being opened, so that the opening process of the switch unit 101 in step S115 and the turning-on process of the switch unit 101 in step S145 are performed. Can be omitted (the same applies to FIGS. 6, 7, and 12 described later).

(First Modification of Procedure of PCS 5 Startup Process)
FIG. 6 is a flowchart showing a first modified example of the procedure of the PCS 5 activation process. 6 is replaced with the process of step S120A shown in FIG. 6 in comparison with the procedure of the PCS5 start process shown in FIG. Only the points differ, and the other processing steps are the same as the processing procedure shown in FIG. For this reason, the same code | symbol is attached | subjected to the step of the same processing content, and the overlapping description is abbreviate | omitted.

In the procedure of the start-up process shown in FIG. 6, when the protective relay 2D detects that a power failure state has occurred in the DC power supply system 1 in which power cannot be supplied from the commercial power system PS to the DC power supply device 3 (step) S100), the power storage device 7 starts discharging, and DC power is supplied from the power storage device 7 to the power feeding paths P11 and N11 (step S105). At the same time, the power supply device 6 temporarily stops the operation of the PCS 5 (step S110).
Subsequently, the power supply device 6 determines whether the DC voltage of the power supply paths P11 and N11 is within a predetermined reference voltage range (for example, within ± 10% of the rated voltage) by the bus voltage detector 61A. (Step S120A).

When it is determined in step S120A that the DC voltages of the power supply paths P11 and N11 are within the predetermined reference voltage range (step S120A: Yes), the power supply device 6 proceeds to step S130. To do. And in the process of step S130, when it determines with it being in the state which can supply the electric power more than a predetermined value to the electric power feeding path from the solar power generation device 4 (step S130: Yes), the power supply device 6 will perform step S140. Shifting to processing, the PCS 5 is activated.
On the other hand, in the process of step S120A, when it is determined that the DC voltage of the power feeding paths P11 and N11 is not within the predetermined reference voltage range (step S120A: No), the power supply device 6 returns to the process of step S110, The operation stop state of the PCS 5 is continued.

That is, in the procedure of the startup process illustrated in FIG. 6, the PCS 5 is started in a state where a DC voltage is output from the power storage device 7 to the power feeding paths P11 and N11. When the PCS 5 detects and connects the DC voltage output from the power storage device 7 to the power supply paths P11 and N11, the PCS 5 converts the DC voltage output to the power supply paths P11 and N11 to the PCS8 of the power storage device 7. By making the voltage higher than the direct-current voltage output by a predetermined amount (for example, a voltage 1% to several% higher), the PCS 5 can be naturally linked to the power feeding paths P11 and N11.
Thereby, at the time of a power failure of DC power supply device 3, electric power can be supplied from power storage device 7 and solar power generation device 4 to power supply paths P11 and N11 in parallel.

(Second modified example of procedure of activation process of PCS 5)
5 and 6, the power supply device 6 detects a signal (for example, a contact signal Aux) indicating a power failure state in which power cannot be supplied from the commercial power system PS to the DC power supply device 3. In this case, the example in which the operation of the PCS 5 is stopped has been described. However, the power supply device 6 detects that the voltages of the power supply paths P11 and N11 serving as power supply buses have decreased to a predetermined voltage value or less, for example, power supply The operation of the PCS 5 may be stopped by detecting that the DC voltage of the paths P11 and N11 has become zero voltage.

FIG. 7 is a flowchart showing a second modification of the procedure of the PCS 5 activation process.
Compared with the procedure of the PCS 5 activation process shown in FIG. 6, the procedure of the PCS 5 activation process shown in FIG. 7 omits the process of the step S105 from the procedure shown in FIG. 6, and the process of the step S105A and the step S115A. The other processing is the same as the processing procedure shown in FIG. For this reason, the same code | symbol is attached | subjected to the step of the same processing content, and the overlapping description is abbreviate | omitted.

In the procedure of the start-up process shown in FIG. 7, when the protective relay 2D detects that a power failure state has occurred in the DC power supply system 1 in which power cannot be supplied from the commercial power system PS to the DC power supply device 3 (step S100), the circuit breaker 2A is opened, but at this time, DC power is not supplied from the power storage device 7 to the power feeding paths P11 and N11.
Subsequently, the power supply device 6 determines whether or not the DC voltage of the power supply paths P11 and N11 serving as the power supply bus lines has dropped below a predetermined voltage value due to a power failure of the DC power supply device 3 (step S105A). When it is determined that the DC voltage of the power supply paths P11 and N11 has decreased to a predetermined voltage value or less (step S105A: Yes), the power supply device 6 temporarily stops the operation of the PCS 5 (step S110). ), The switch unit 101 is opened (step S115).
Subsequently, the power supply device 6 controls the PCS 8 to start supplying power from the power storage device 7 to the power feeding paths P11 and N11 (step S115A).

The subsequent processing procedure is the same as the processing procedure from step S120A to step S145 shown in FIG.
Thereby, at the time of a power failure of the DC power supply device 3, the power supply device 6 can detect the DC voltage of the power supply paths P <b> 11 and N <b> 11 serving as power supply buses and can stop the operation of the PCS 5.

(Description of control panel 63)
Next, the control panel 63 will be described. The control panel 63 (setting input unit) detects an operation for setting the open / close state (on / off state) of the switch unit 100, controls the switch control unit 62 according to the detected operation, and controls the switch unit 100. Open / close status is displayed. The control panel 63 can be configured to include, for example, a touch panel display device.
FIG. 8 is an explanatory diagram showing an example of the control panel 63. In the example shown in FIG. 8, a “single-line diagram display screen 63a of the DC power supply system 1” on the touch-panel display screen, a “switch selection button 63b” indicating the position where the operation is detected, and an “on” button 63c. ”And“ open button 63d ”are shown.

  In addition, in the “display screen 63a of the single-line connection diagram of the DC power supply system 1” shown in FIG. 8, all the load devices L11 to L16 in the DC power supply system 1 are displayed. You may make it select and display only the load apparatus which needs to supply electric power from the solar power generation device 4 at the time of the power failure of the power supply device 3. FIG.

For example, on the display screen 63a of this single-line diagram, the state of the switch unit 100 is indicated by the color of the area surrounding the switch unit with a broken line. For example, “green” is displayed when the switch unit 100 is in the open state, and “red” is displayed when the switch unit 100 is in the closed state.
When the switch unit 111 in the open state indicated by “SW111” is turned on, the user operates the switch selection button 63b, and thereafter, the area surrounded by the broken line of the switch unit 111 on the display screen 63a of the single-line connection diagram is displayed. Manipulate. By operating the area indicating the switch unit 111, the control panel 63 starts blinking display of the area indicating the switch unit 111. By operating the input button 63c in a state where the area indicating the switch unit 111 is blinking, the control panel 63 switches on the switch unit 111 via the switch control unit 62 in accordance with the series of operations described above. To close. Further, the control panel 63 changes the display color of the switch unit 111 from “green” to “red”.

  When the switch unit 111 in the closed state is opened, the switch selection button 63b is operated, and thereafter, the region surrounded by the broken line of the switch unit 111 is operated on the display screen 63a of the single-line connection diagram. By operating the area indicating the switch unit 111, the control panel 63 starts blinking display of the switch unit 111. By operating the release button 63d while the area indicating the switch unit 111 is blinking, the control panel 63 opens the switch unit 111 via the switch control unit 62 in accordance with the series of operations described above. Let Further, the control panel 63 changes the display color of the switch unit 111 from “red” to “green”. The same applies to other switch units 100.

  When the switch unit 100 is designated by operating the switch selection button 63b, a plurality of switch units 100 can be designated at the same time, for example, the switch unit 111 and the switch unit 112 are designated at the same time.

(Configuration of control circuit of switch part)
FIG. 9 is a configuration diagram illustrating a configuration example of the control circuit of the switch unit. As shown in FIG. 9, the switch unit 100 includes a switch control signal receiving unit 71, a switch opening / closing unit 72, an opening / closing result notifying unit 73, a switch 74, and a power supply unit 75.

The switch control signal receiving unit 71 receives the switch control signal CNT from the switch control unit 62 in the power supply device 6.
Based on the switch control signal CNT received by the switch control signal receiving unit 71, the switch opening / closing unit 72 determines whether or not the switch opening / closing unit 72 is a switch designated by “switch identification information”. When the switch opening / closing unit 72 determines that the switch is the switch designated by the “switch identification information”, the switch opening / closing unit 72 turns on / off the switch 74 based on the “switch on / off information”. ) That is, the switch opening / closing unit 72 performs an opening / closing operation of the switch 74.

  When the switch 74 is turned on / off, the opening / closing result notifying unit 73 transmits information on the operation result of turning on / off the switch 74 to the switch control unit 62 of the power supply device 6. The switch control unit 62 that has received the operation result information displays the open / close state of the switch 74 on the control panel 63 based on the on / off operation result information of the switch 74 received from the open / close result notification unit 73. Let

The power supply unit 75 supplies power to each of the switch control signal receiving unit 71, the switch opening / closing unit 72, and the opening / closing result notification unit 73. The power supply unit 75 may store electric power that causes the switch control signal receiving unit 71, the switch opening / closing unit 72, and the opening / closing result notification unit 73 to function.
As a result, the user can instruct the control panel 63 to open and close the switch 74 on the power supply path, and can display and check the open / close result on the control panel 63.

Next, power supply processing in the DC power supply system will be described with reference to FIG.
FIG. 10 is a flowchart illustrating a procedure of power supply processing in the DC power supply system. FIG. 10 shows processing from a state in which the DC power supply device 3 is in a power failure state and power cannot be supplied from the power storage device 7.

  First, the control panel 63 detects an instruction from the user, and detects that there is a load device that requires power supply in accordance with the detected instruction (step S210). Subsequently, the PCS activation unit 61 activates the PCS 5 (step S220).

  Subsequently, the control panel 63 controls the switch control unit 62 to turn on the switch unit 101 (step S230).

Subsequently, the control panel 63 detects a user operation for designating a power supply range. For example, the control panel 63 detects that the switch unit 111 and the switch unit 112 are designated (step S240).
Subsequently, the control panel 63 controls the switch control unit 62 so that the switch unit 100 (more precisely, the switch 74 in the switch unit 100) corresponding to the detected operation is sequentially turned on. For example, the switch control unit 62 sequentially sends a switch control signal CNT to the switch unit 111 and the switch unit 112 so that the switch unit 111 and the switch unit 112 are turned on in order. These are sequentially input (step S250).

Subsequently, the switch unit 100 that has determined that the switch control signal CNT targets itself switches on its own switch 74 and notifies the switch control unit 62 of the result (step S260).
Subsequently, in response to the notification received from the switch unit 100, the switch control unit 62 causes the control panel 63 to display the state of the switch unit 100 included in the notification. The control panel 63 displays the state of the switch unit 100 on the display screen 63a of the control panel 63 (step S270).
With the above power supply process, it is possible to supply power by setting a power supply range to which the load device L11 and the load device L12 are connected.

  As a modification of the above, in the state where the switch unit 111 and the switch unit 112 are open, the switch control in the power supply device 6 is performed by the user directly specifying the switch unit 112 and instructing the switch-on. The unit 62 may automatically execute turning on of the switch unit 111 and turning on of the switch unit 112 in order.

Similarly, when power is supplied to the load device L14 and the load device L15 in the power failure state of the DC power supply device 3, the user turns on the switch unit 114 and the switch unit 115 in turn, thereby the load device Power can be supplied by setting a power supply range to which L14 and the load device L15 are connected.
As a further different modification, the switch control unit 62 in the power supply device 6 may collectively perform the setting of each switch unit 100 first and supply power after all the settings are completed.

As described above, the user instructs the switch unit 116 to open and close the switch unit 116 from the power supply paths P11 and N11 to the power supply paths P28 and N28 on the control panel 63. It is possible to set the range of the power supply path to be supplied.
As a result, when the user cannot supply power to the load device from both the DC power supply device 3 and the power storage device 7 at the time of a power failure of the DC power supply device 3, By instructing the switch unit 111 to open and close the switch unit 116 on the panel 63, a load device that can supply power from the solar power generation device 4 can be selected. Moreover, the range of the load apparatus which supplies electric power can be expanded sequentially according to the electric power feeding capability of the solar power generation device 4.

  In the DC power supply system 1 described above, an example in which the power storage device 7 is installed as a backup power supply device is shown, but the present invention can be suitably applied even when the power storage device 7 is not installed. When the power storage device 7 is not provided, when the DC power supply device 3 is in a power failure state and power is not supplied to the power supply paths P11 and N11, the power supply device 6 immediately starts the PCS 5 or a user instruction It will be activated by.

(Modification of DC power supply system 1)
FIG. 11 is a configuration diagram showing a schematic configuration of the DC power supply system 1A. 11 is different from the DC power supply system 1 shown in FIG. 3 only in that the power storage device 7, the power conditioner (PCS) 8, and the switch unit 102 shown in FIG. 3 are omitted. The other configuration is the same as that of the DC power feeding system 1 shown in FIG. For this reason, the same code | symbol is attached | subjected to the same component and the overlapping description is abbreviate | omitted.

  FIG. 12 is a flowchart showing the procedure of the PCS 5 activation process in the DC power supply system 1A. The PCS 5 start-up process procedure shown in FIG. 12 differs from the PCS 5 start-up process procedure in the DC power supply system 1 shown in FIG. 5 only in that the process step of Step S105 shown in FIG. These processing steps are the same as the processing procedure shown in FIG. For this reason, the same code | symbol is attached | subjected to the step of the same processing content, and the overlapping description is abbreviate | omitted.

  That is, in the DC power supply system 1A, when the protective relay 2D detects that a power failure state has occurred in which power cannot be supplied from the commercial power system PS to the DC power supply device 3 (step S100), power is supplied from the power storage device 7. The operation of the PCS 5 is temporarily stopped without supplying DC power to the paths P11 and N11 (step S110). The subsequent processing procedure is the same as the processing procedure from step S115 to step S145 shown in FIG.

  As described above, in the DC power feeding system 1A shown in FIG. 11, when the protective relay 13 detects that a power failure state has occurred in which power cannot be supplied from the commercial power system PS to the DC power supply device 3, the circuit breaker 2A is opened. At the same time, the PCS 5 temporarily stops its operation. Then, the power supply device 6 detects that the voltage of the power feeding paths P11 and N11 has decreased to a predetermined voltage value or less by the bus voltage detection unit 61A, and restarts the PCS 5 after this detection, and the solar power generation device Power is supplied from 4 to the power supply paths P11 and N11 via the PCS5.

The embodiment of the present invention has been described above. In the above embodiment, the function of each processing unit in the power supply device 6 may be realized by dedicated hardware. A program for realizing the function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by a computer system and executed to realize the function.
That is, the power supply device 6 has a computer system inside. A series of processes related to the above-described process is stored in a computer-readable recording medium in the form of a program, and the above-described process is performed by the computer reading and executing this program. Here, the computer-readable recording medium refers to a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, and the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program. The “computer system” here includes an OS and hardware such as peripheral devices.

  As described above, the DC power supply system 1 according to the embodiment of the present invention is connected from the DC power supply device 3 to the load devices L11 to L16 connected to the power supply path of the DC power supply device 3 that outputs a DC voltage (DC380V). While supplying electric power via the power feeding paths P11 and N11, the solar power generation device 4 is connected to the power feeding paths P11 and N11 via the power conditioner (PCS) 5, and from the solar power generation device 4 to the power feeding paths P11 and P11. A DC power supply system 1 that supplies power to N11, and supplies power to supply an operating voltage that enables the power conditioner (PCS) 5 that has stopped output to output power from the power conditioner 5 The power supply device 6 includes the device 6, and the power conditioner 5 is stopped and the power supply device 6 receives power from the power conditioner 5. If the operating voltage makes it possible to force is not supplied from the DC power supply device 3 to the power conditioner 5, by supplying the operating voltage to the power conditioner 5 to start the power conditioner 5.

  As described above, in the DC power supply system 1 according to the present embodiment, the operating voltage for starting the power conditioner (PCS) 5 of the photovoltaic power generation apparatus 4 that has been temporarily stopped at the time of a power failure of the DC power supply apparatus 3 is used. When the power cannot be supplied to the power source 5, the power supply device 6 supplies an operating voltage to the power conditioner 5 to start the power conditioner 5 independently. In addition, the power supply device 6 controls the open / close state of the switch unit 100 after the power conditioner 5 is activated, thereby providing a power supply path for supplying power from the solar power generation device 4 to the load devices L11 to L16. Set the range.

  As a result, in the DC power supply system 1, the power conditioner 5 of the solar power generation device is in a power outage state in which the operating voltage enabling operation from the interconnected power supply system to the power conditioner 5 of the solar power generation device is not supplied. After the output is stopped, the power conditioner 5 can be activated while being in the power outage state to supply power to the power supply path.

Further, in the DC power supply system 1 of the above-described embodiment, in the power supply paths P28 and N28 from the power supply paths P21 and N21, the power supply range that supplies power from the solar power generation device 4 and the non-power supply range that does not supply power are divided. The power supply device 6 includes a switch unit 100 disposed at a location, and the power supply device 6 transmits a switch control signal CNT to the switch unit 100 and controls the open / closed state of the switch unit 100 by the switch control signal CNT, thereby supplying power. Set the power supply range in the route.
As described above, in the DC power supply system 1 of this embodiment, after the power conditioner 5 is activated, the power supply device 6 transmits the switch control signal CNT to the switch unit 100 to control the open / close state of the switch unit 100. Thereby, the range of the electric power feeding path which supplies electric power from the solar power generation device 4 to the load devices L11 to L16 is set.
Thereby, in the DC power supply system 1, after starting the power conditioner 5 of the solar power generation device 4, a desired load device can be selected and power can be supplied. In other words, when power is supplied from the solar power generation device 4 to the load devices L11 to L16 at the time of a power failure of the DC power supply device 3, a load device that supplies power according to the power supply capability of the solar power generation device 4 is provided. You can choose. For example, at the time of a power failure of the DC power supply device 3, it is possible to supply power by selecting a lighting device or the like.

  In the above embodiment, when the operating voltage is not supplied to the power conditioner (PCS) 5, the power supply device 6 supplies the operating voltage to the power conditioner 5 of the photovoltaic power generator 4 to supply the power conditioner. And a switch control unit 62 that transmits a switch control signal CNT to the switch unit 100 and controls an open / closed state of the switch unit 100 by the switch control signal CNT. And a setting input unit (control panel 63) for setting the open / close state of the switch unit 100. The switch control unit 62 is based on the setting information of the open / close state of the switch unit 100 set in the setting input unit. The open / close state of the switch unit 100 is controlled.

  As described above, the power supply device 6 supplies the power conditioner 5 with an operating voltage for starting the power conditioner (PCS) 5 of the photovoltaic power generation device 4 that has been temporarily stopped at the time of a power failure of the DC power supply device 3. When it is not possible, a power conditioner starting part (PCS starting part 61) supplies an operating voltage to the power conditioner (PCS) 5 of the solar power generation device 4 to start the power conditioner 5 independently. The setting input unit is a control panel 63 for setting the open / close state of the switch unit 100 and displaying the open / closed state of the switch unit 100. The user controls the power supply path (P11 and P11) with the control panel 63. N11, P21 and N21 to P28 and N28) are instructed to open and close the switch unit 100. The switch control unit 62 controls the open / close state of the switch unit 100 based on the setting information of the open / close state of the switch unit 100 set in the control panel 63.

  Thereby, the user can arbitrarily select a load device that supplies power from the solar power generation device 4 by instructing the setting input unit (control panel 63) to open and close the switch unit 100. In addition, the range of load devices that supply power can be sequentially expanded in accordance with the power supply capability of the solar power generation device 4.

  Although the embodiments of the present invention have been described above, the DC power feeding system of the present invention is not limited to the above illustrated examples, and various modifications can be made without departing from the scope of the present invention. Of course.

  For example, the DC power supply system shown in FIG. 1 has been described with respect to an example in which DC power is supplied to a load device connected to a power supply path. However, even if an AC power supply system supplies AC (for example, AC 400V) to the load device. Good. In the case of an AC power supply system, the PCS 5 of the photovoltaic power generation device 4 and the PCS 8 of the power storage device 7 are DC / AC converters (inverters) and electric power such as a PCS transformer that boosts (or steps down) alternating current to a predetermined voltage. A conversion device may be provided.

Further, in the DC power supply system 1 shown in FIG. 1, an example in which the solar power generation device 4 and the power storage device 7 are installed as the power supply device for backup is shown, but a fuel cell and an engine are further used as the power supply for backup. The present invention can be suitably applied even when a generator or the like is installed.
Further, the example of opening and closing the switch unit 100 using the control panel 63 shown in FIG. 8 is an example, and other control methods for specifying and opening the switch unit 100 on the power supply path are shown. May be used.

1, 1A ... DC power supply system, 2 ... Power receiving equipment, 2A ... Circuit breaker,
2B ... auxiliary contact, 2C ... transformer, 2D ... protective relay,
3 ... DC power supply (REC),
4 ... Solar power generation device (PV), 5, 8 ... Power conditioner (PCS),
6 ... Power supply device, 7 ... Power storage device (BATT),
DESCRIPTION OF SYMBOLS 11 ... Distribution board (PDF), 51 ... Power generation amount control part, 52 ... Grid connection control part,
53... DC / DC converter, 61.
61A ... bus voltage detector,
62 ... Switch control unit, 63 ... Control panel (setting input unit),
63a: Single-line diagram display screen, 63b: Switch selection button,
63c ... Input button, 63d ... Release button,
64... Storage battery, 71... Switch control signal receiver, 72.
73... Open / close result notification unit, switch 74, power supply unit 75,
100, 101-116 ... switch part,
L11 to L16 ... load device, Aux ... contact signal,
P11, P21 to P28, N11, N21 to N28 ... Feeding path

Claims (8)

Power is supplied from the DC power supply device to the load device connected to the power supply path of the DC power supply device that outputs a DC voltage via the power supply route, and the photovoltaic power generation device is supplied to the power supply route via the power conditioner. A DC power supply system connected to supply power from the solar power generation device to the power supply path,
From said photovoltaic device to the power conditioner in a stopped state, which stops the supply of power to the power supply path, a power supply device for supplying a reference voltage of a voltage to force the power conditioner is out,
The power supply device
The commercial electric power system is a power failure becomes the power conditioner is the stop state, and, in the case of the photovoltaic device capable power supply to the power supply path, wherein the reference voltage is the DC power supply A DC power supply system, wherein when the power conditioner is not supplied from a device, the power conditioner is started by supplying the reference voltage to the power conditioner without passing through the power supply path. The power supply path includes a switch unit disposed at a location that divides a power supply range that supplies power from the solar power generation device and a non-power supply range that does not supply power.
The power supply device
The power supply range in the power supply path is set by transmitting a switch control signal to the switch unit and controlling the open / close state of the switch unit by the switch control signal. DC power supply system. The power supply device
When the reference voltage is not supplied to the power conditioner, a power conditioner starting unit that starts the power conditioner by supplying the reference voltage to the power conditioner of the photovoltaic power generation device;
A switch control unit that transmits a switch control signal to the switch unit and controls an open / closed state of the switch unit by the switch control signal;
A setting input unit for setting an open / close state of the switch unit;
With
The switch control unit
Based on the setting information of the open / close state of the switch unit set in the setting input unit,
The DC power supply system according to claim 2, wherein an open / close state of the switch unit is controlled. The switch part is
A switch control signal receiver that receives the switch control signal from the power supply device;
Based on the switch control signal received by the switch control signal receiving unit, a switch opening and closing unit for opening and closing the switch,
The DC power supply system according to claim 2, further comprising: The switch part is
The DC power supply system according to any one of claims 2 to 4, comprising a semiconductor switching element for connecting and disconnecting the power supply path. Power is supplied from the DC power supply device to the load device connected to the power supply path of the DC power supply device that outputs a DC voltage via the power supply route, and the photovoltaic power generation device is supplied to the power supply route via the power conditioner. A power supply device in a direct current power supply system that is connected and supplies power to the power supply path from the solar power generation device,
From said photovoltaic device to the power conditioner in a stopped state, which stops the supply of power to the power supply path to supply the reference voltage of the voltage force the power conditioner is out,
The commercial electric power system is a power failure becomes the power conditioner is the stop state, and, in the case of the photovoltaic device capable power supply to the power supply path, wherein the reference voltage is the DC power supply A power supply device, wherein, when not supplied from the device to the power conditioner, the power conditioner is started by supplying the reference voltage to the power conditioner without passing through the power supply path. Power is supplied from the DC power supply device to the load device connected to the power supply path of the DC power supply device that outputs a DC voltage via the power supply route, and the photovoltaic power generation device is supplied to the power supply route via the power conditioner. A power supply control method in a DC power supply system that is connected and supplies power to the power supply path from the solar power generation device,
The power conditioner in a stopped state, which stops the supply of power to the power supply path from said photovoltaic device includes a power supply step of supplying a reference voltage of the voltage force out the power conditioner,
Further, the power supply step is to power failure the commercial power system becomes the power conditioner is the stop state, and there in case of the photovoltaic device capable power supply to the power supply path When the reference voltage is not supplied from the DC power supply device to the power conditioner, the step of supplying the reference voltage to the power conditioner without passing through the power supply path and starting the power conditioner is included. A power supply control method in a direct current power supply system. Power is supplied from the DC power supply device to the load device connected to the power supply path of the DC power supply device that outputs a DC voltage via the power supply route, and the photovoltaic power generation device is supplied to the power supply route via the power conditioner. A DC power supply system connected to supply power from the solar power generation device to the power supply path,
The power conditioner in a stopped state, which stops the supply of power to the power supply path from the photovoltaic device, a DC power supply having a power supply device for supplying a reference voltage of a voltage to force the power conditioner is out A computer in the power supply device in the system;
The commercial electric power system is a power failure becomes the power conditioner is the stop state, and, in the case of the photovoltaic device capable power supply to the power supply path, wherein the reference voltage is the DC power supply A program for executing a step of starting the power conditioner by supplying the reference voltage to the power conditioner without passing through the power supply path when the device is not supplied to the power conditioner.

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