JP6666175B2 - Power supply system - Google Patents

Description

  The present invention relates to a technology of a power supply system including a plurality of units including a power storage device and a transformer capable of boosting a voltage of power from the power storage device.

  2. Description of the Related Art Conventionally, a technology of a power supply system including a plurality of units including a power storage device and a transformer capable of boosting a voltage of power from the power storage device is known. For example, as described in Patent Document 1.

  The power supply system (photovoltaic power generation system) described in Patent Literature 1 includes a plurality of units including a photovoltaic power generation facility, a power storage device, and a transformer (distribution transformer). The photovoltaic power generation equipment and the power storage device are connected to a middle part of the distribution line via a transformer. The distribution line connects the power system and the load. In such a power supply system, power can be supplied to a load at the time of a power outage by circulating power from the photovoltaic power generation facilities and the power storage device to the distribution line via a transformer during a power outage.

JP 2012-10536 A

  However, if electric power is circulated to the distribution line via a transformer during a power outage, the electric power may be charged by the power storage device of the downstream unit (load side). In such a case, for example, inconvenience such as the system going down occurs.

  The present invention has been made in view of the above situation, and the problem to be solved is that the electric power circulated through the transformer at the time of a power outage is charged by the power storage device of the downstream (load side) unit. It is an object of the present invention to provide a power supply system capable of preventing the power supply from being lost.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, a distribution board capable of supplying power from a commercial power supply to a load, a first power generation device capable of generating power using natural energy, and charging and discharging of power from the first power generation device and the commercial power supply A first power storage device, and a first power conditioner for controlling the charging and discharging of the first power storage device, interconnection operation to supply power to the distribution board in connection with the commercial power supply, A first unit capable of performing an independent operation of supplying power to the distribution board independently of the commercial power supply, and a supply source of power supplied to the load, the commercial power supply or the A first switching panel that switches to one unit, a transformer that boosts the voltage of the power supplied from the first unit to the distribution board during the self-sustaining operation, and that can charge and discharge power from the commercial power supply A second power storage device, and the second power storage device; A second unit that includes a second power conditioner that controls charging and discharging of the power storage device, is disposed closer to the load side than the first switching panel, and supplies power to the distribution board, and a power supply for the commercial power supply. A power failure detection unit capable of detecting a power failure, and disposed between the first switching panel and the second unit, permitting the flow of power between the first switching panel and the second unit. And a first opening / closing unit that switches between an open state that prohibits the flow of electric power between the first switching panel and the second unit, and a power failure is detected by the power failure detection unit. A control unit that switches the first opening / closing unit to an open state when a predetermined condition is satisfied.

The second power storage device of the second unit is set so as to be able to perform charging within a predetermined charging period, and the control unit is configured to detect a power failure by the power failure detection unit and to execute the predetermined condition. The first opening / closing unit may be switched to an open state when the predetermined charging period is satisfied as a case where the condition is satisfied.
With such a configuration, it is possible to prevent the power storage device of the downstream unit (load side) from charging the electric power circulated through the transformer at the time of a power outage with simple control according to the period.

The control unit is configured to detect a power outage by the power outage detection unit and supply power from the first unit to the distribution board via the transformer during the self-sustaining operation when the predetermined condition is satisfied. Is stopped, the first opening / closing section may be switched to an open state, and the open state may be maintained until the power failure is resolved.
With such a configuration, it is possible to prevent the electric power circulated through the transformer at the time of the power outage from being charged by the power storage device of the downstream (load) unit, and to perform the complicated operation of the second unit. Can be prevented.

The load includes a plurality of specific loads set according to the magnitude of the need to maintain power supply, and further includes a second switchboard that switches a power supply destination to any of the plurality of specific loads. The second unit is connected to the commercial power supply or the first unit to supply power to the distribution board, and independently of the commercial power supply and the first unit. And an independent operation for supplying electric power to the distribution board, wherein the control unit determines a supply destination of the electric power from the second unit according to an operation state of the second unit. The switching to any one of the plurality of specific loads may be performed by the second switching panel.
With such a configuration, any load (specific load) set according to the magnitude of the necessity to maintain the power supply is selected as the power supply destination in accordance with the operation status of the second unit. be able to.

The second unit is a second power generation device capable of generating power using natural energy, an open state in which output of power generated by the second power generation device is prohibited, and power generation is performed by the second power generation device. And a second opening / closing unit that switches between a closed state that permits output of the power that has been applied and the control unit that switches the second opening / closing unit to an open state when a power failure is detected by the power failure detection unit. It may be that.
With such a configuration, it is possible to prevent the power generated by the second solar power generation device from flowing backward to the commercial power supply during a power outage.

The device further includes a resistive load connected between the first opening and closing unit and the second unit via a third opening and closing unit, wherein the third opening and closing unit is configured to receive the resistance load from the second unit. The control unit is configured to be able to switch between a closed state in which the flow of power to the load is permitted and an open state in which the flow of power from the second unit to the resistive load is prohibited. Is detected, the third opening / closing unit may be switched to the closed state.
With this configuration, even when the power output from the second unit flows backward to the commercial power supply during a power outage, the power that flows backward is prevented from being supplied to the first unit. can do.

  The present invention has the following effects.

  It is possible to prevent the electric power circulated through the transformer at the time of power failure from being charged by the power storage device of the downstream (load) unit.

FIG. 1 is a block diagram showing a configuration of a power supply system according to a first embodiment. Similarly, the block diagram which showed the structure of the electrical connection of each unit and another apparatus. FIG. 3 is a block diagram illustrating a power supply mode before the first unit starts an independent operation during a power outage. FIG. 3 is a block diagram illustrating a power supply mode immediately after the first unit starts an independent operation during a power outage. Similarly, FIG. 4 is a block diagram illustrating a power supply mode after a predetermined period has elapsed after the first unit started an independent operation during a power outage. Similarly, the block diagram which showed the electric power supply aspect after the output by the independent operation of the 1st unit was stopped at the time of a power failure. FIG. 3 is a block diagram showing a power supply mode when a power failure occurs during a predetermined charging time period. The block diagram showing the composition of the 2nd change board and the load in the power supply system concerning a second embodiment. (A) Similarly, the block diagram which showed the electric power supply mode at the time of normal. (B) Similarly, the block diagram which showed the electric power supply mode when a predetermined period has not passed after the power failure occurred. (C) Similarly, a block diagram showing a power supply mode when a predetermined period has elapsed after the occurrence of a power failure. FIG. 7 is a block diagram showing a configuration of a power supply system according to a third embodiment. Similarly, the block diagram which showed the structure of the solar power generation device of 2nd, 3rd, and 4th unit and a switchboard. (A) Similarly, the block diagram which showed the electric power supply mode at the time of normal. (B) Similarly, the block diagram which showed the electric power supply aspect when the electric power is output from the 1st unit at the time of a blackout at the time of self-sustaining operation. FIG. 10 is a block diagram showing a configuration of a power supply system according to a fourth embodiment. FIG. 3 is a block diagram illustrating a power supply mode in a normal state. FIG. 3 is a block diagram showing a power supply mode during a power outage. Similarly, the block diagram which showed the electric power supply aspect after the output by the independent operation of the 1st unit was stopped at the time of a power failure. Similarly, FIG. 9 is a block diagram showing a power supply mode when power from the second, third, and fourth units flows backward due to the pseudo interconnection operation during a power outage.

  Hereinafter, the power supply system 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  The power supply system 1 shown in FIG. 1 is provided in a factory and supplies power to a load 2 in the factory. The power supply system 1 includes a distribution board 10, a sensor unit 20, a first unit 30, a transformer 40, a first switching board 50 (a first switch 51 and a second switch 52), a third switch 60, It includes a fourth switch 70, a second unit 80, a third unit 90, a fourth unit 100, a second switchboard 110, and the like.

  The distribution board 10 shown in FIG. 1 distributes electric power supplied from a power supply source to the load 2. The distribution board 10 is supplied with power according to the power consumption of the load 2 from a power supply source (such as the commercial power supply 3 or a first unit 30 described later). The distribution board 10 is arranged in the middle of the distribution line L1 that connects the commercial power supply 3 and the load 2. The load 2 includes a load 121, a load 122, and a load 123. The load 121, the load 122, and the load 123 are connected to the downstream end of the distribution line L1. More specifically, the downstream end of the distribution line L1 is branched, and the loads 121, 122, and 123 are respectively connected to the branched ends.

  The sensor unit 20 shown in FIGS. 1 and 2 detects power flowing through the distribution line L1 in the distribution board 10. The sensor unit 20 includes a first sensor 21, a second sensor 22, a third sensor 23, a fourth sensor 24, and the like.

  Each of the sensors 21 to 24 detects the electric power at the location where it is arranged. Each of the sensors 21 to 24 is disposed in the middle of the distribution line L1 (in the distribution board 10). Each of the sensors 21 to 24 includes a first sensor 21, a second sensor 22, a third sensor 23, and a fourth sensor 21 in the distribution board 10 from the commercial power supply 3 side to the load 2 side (downstream side). Are arranged in this order. Each of the sensors 21 to 24 is configured to be able to output a signal relating to a detection result.

  The first unit 30 shown in FIGS. 1 and 2 is one of the power supply sources for the load 2. The first unit 30 includes a first solar power generator 31, a first power storage device 32, a first inverter 33, and the like.

  The first solar power generation device 31 is a device that generates power using sunlight. The first solar power generation device 31 includes a solar cell panel and the like.

  The first power storage device 32 is a device capable of charging and discharging power. The first power storage device 32 includes a storage battery capable of charging and discharging power, a charger for rectifying supplied AC power to charge the storage battery, and the like. The first power storage device 32 is configured to be able to charge and discharge power from the first solar power generation device 31 and the commercial power supply 3.

  The first power conditioner 33 is a hybrid power conditioner that controls input and output of electric power. The first inverter 33 includes a converter for converting DC power to a predetermined voltage, an inverter for converting DC power to AC power, a control unit for controlling operation, and the like. The first inverter 33 is connected to the first solar power generation device 31 and the first power storage device 32 via two different distribution lines. The first inverter 33 can perform an interconnection operation and an independent operation.

  The interconnection operation of the first power conditioner 33 is an operation in which the first power conditioner 33 is connected to the commercial power supply 3 at a normal time (when there is no power failure). Thus, the first inverter 33 outputs power generated by the first solar power generation device 31 or power discharged from the first power storage device 32 in a state of being normally connected to the commercial power supply 3. In addition, the power generated by the first solar power generation device 31 or the power from the commercial power supply 3 can be input (charged) to the first power storage device 32.

  The independent operation of the first inverter 33 is to operate independently of the commercial power supply 3 at the time of a power failure. In this way, the first inverter 33 outputs power generated by the first solar power generation device 31 or power discharged from the first power storage device 32 in a state independent of the commercial power supply 3 in an emergency, The power generated by the first solar power generation device 31 can be input (charged) to the first power storage device 32. In addition, when the first power conditioner 33 performs the self-sustaining operation, it can simultaneously output and input (charge) the power generated by the first solar power generation device 31.

  Further, as shown in FIG. 2, the first inverter 33 is electrically connected to the first sensor 21. The first inverter 33 is configured to receive a signal output from the first sensor 21 and acquire a detection result of the first sensor 21 based on the input signal. The first inverter 33 can perform a load following operation that adjusts the amount of electric power to be output based on the acquired detection result of the first sensor 21. Further, the first inverter 33 can acquire information on the occurrence of a power failure based on the acquired detection result of the first sensor 21.

  As shown in FIG. 2, the first inverter 33 is electrically connected to a first switching panel 50, a third switch 60, and a fourth switch 70, which will be described later. The first inverter 33 can control the first switchboard 50, the third switch 60, and the fourth switch 70, respectively, based on its own operation status and the acquired information about the occurrence of a power failure.

  The first unit 30 configured as described above is connected to the distribution board 10 via the distribution lines L2 and L3.

  More specifically, in the first unit 30, the first inverter 33 is connected to the distribution line L1 (the first sensor 21 and the first switching panel 50 to be described later) in the distribution panel 10 via the distribution line L2. Between). Thus, the first inverter 33 is connected to the commercial power supply 3 and the load 2 via the distribution lines L2 and L1. Note that the distribution line L2 is a distribution line that is used during normal times (that is, during the interconnection operation of the first inverter 33).

  In the first unit 30, the first inverter 33 is connected to a later-described first switchboard 50 (midway of the distribution line L1) via the distribution line L3. Thus, the first inverter 33 is connected to the load 2 via the distribution lines L3 and L1. Note that the distribution line L3 is a distribution line used at the time of a power failure (that is, at the time of the independent operation of the first inverter 33).

  Note that a first breaker 11 is provided in the distribution board 10 on the distribution line L3. The first breaker 11 inhibits the flow (cuts off the circuit) when power (current) exceeding a specified value flows.

  The transformer 40 shown in FIG. 1 boosts power. The transformer 40 is provided in the middle of the distribution line L3. As a result, the power output from the first unit 30 during the self-sustaining operation can be boosted from 100 V to 200 V, for example, and consumed by the load 2.

  The first switchboard 50 shown in FIGS. 1 and 2 switches the supply source of the power flowing to the load 2 via the first switchboard 50 as appropriate. The first switching panel 50 is provided in the middle of the distribution line L1 (between the connection between the distribution lines L1 and L2 and a third switch 60 described later). The first switching panel 50 includes a first switch 51, a second switch 52, and the like.

  The first switch 51 and the second switch 52 are for turning on / off (permitting or prohibiting) the flow of electric power at the respective locations. The first switch 51 is arranged on the distribution line L3 in the first switchboard 50. The second switch 52 is disposed on the distribution line L1 in the first switching panel 50 (more specifically, on the commercial power supply 3 side from the connection between the distribution lines L1 and L3).

  The ON / OFF of the first switch 51 and the second switch 52 are set so as to be mutually exclusive. Specifically, when the first switch 51 is turned on, the second switch 52 is turned off. When the first switch 51 is turned off, the second switch 52 is turned on.

  In this manner, the first switchboard 50 causes the first switch 51 and the second switch 52 to be turned on and off to cause the downstream side of the first switchboard 50 of the distribution line L1 to move toward the first side of the distribution line L1. Is connected to either the upstream side of the switchboard 50 or the distribution line L3.

  Specifically, in the normal state, the first switchboard 50 is located upstream of the first switchboard 50 of the distribution line L1 when the first switch 51 is turned off and the second switch 52 is turned on. And the downstream side are connected. As described above, when the upstream side and the downstream side of the first switching panel 50 of the distribution line L1 are connected, the load 2 is connected to the commercial power supply 3 via the distribution line L1, and the distribution line L1. It is connected to the first unit 30 via L2. As a result, the first switching panel 50 switches the supply source of the power flowing to the load 2 via the first switching panel 50 to the commercial power source 3 or the first unit 30 (more specifically, the interconnection). It is possible to switch to the first unit 30) during operation.

Also, at the time of a power failure, the first switchboard 50 is connected to the downstream side of the first switchboard 50 of the distribution line L1 by turning on the first switch 51 and turning off the second switch 52. Connect the wire L3. As described above, when the downstream side of the first switchboard 50 of the distribution line L1 is connected to the distribution line L3, the load 2 is connected to the first unit 30 via the distribution lines L1 and L3. Thus, the first switching panel 50 switches the supply source of the electric power flowing to the load 2 via the first switching panel 50 to the first unit 30 (more specifically, the first unit 30 in the self-sustaining operation). Unit 30).

  The switching control of the first switching panel 50 (on / off control of the first switch 51 and the second switch 52) is performed by the first inverter 33 of the first unit 30.

  The third switch 60 shown in FIG. 1 and FIG. 2 turns on / off (permits or prohibits) the flow of power at the location where the switch is placed. The third switch 60 is disposed between the first switchboard 50 and a fourth switch 70 described later in the distribution line L1 in the distribution board 10. The third switch 60 is turned on when a predetermined on condition is satisfied, and permits the flow of electric power at the location where the switch is arranged. Further, the third switch 60 is turned off when a predetermined off condition is satisfied, and prohibits the flow of electric power at the location where the third switch 60 is arranged.

  The ON condition of the third switch 60 is that it is a normal time, or that the power from the first inverter 33 (the power from the first unit 30) is output by the self-sustaining operation at the time of a power failure. Either. Further, the off condition of the third switch 60 is that power from the first inverter 33 (power from the first unit 30) is not output by the independent operation at the time of power failure. The third switch 60, which is normally on, is turned off once when a power failure occurs, and turned on when the output of the power from the first inverter 33 in the self-sustaining operation is started. Further, in the present embodiment, the third switch 60 satisfies the on condition when the power is once turned off for some reason when the power output from the first inverter 33 is started by the self-sustaining operation and turned on for some reason. Even if it is determined that the power failure has occurred, control is performed so that the power is not turned on again until the power failure is resolved. The on / off control of the third switch 60 (determination whether the third switch 60 satisfies the on condition or the off condition) is performed by the first unit 30 as shown in FIG. This is performed by the inverter 33.

  The fourth switch 70 shown in FIG. 1 and FIG. 2 turns on / off (permits or prohibits) the flow of power at the location where the switch is placed. The fourth switch 70 is disposed between the third switch 60 and the second sensor 22 on the distribution line L1 in the distribution board 10. The fourth switch 70 is turned on when a predetermined on condition is satisfied, and permits the flow of electric power at the location. The fourth switch 70 is turned off when a predetermined off condition is satisfied, and prohibits the flow of electric power at the location where the fourth switch 70 is arranged.

  The ON condition of the fourth switch 70 is either a normal time or a time of a power failure and not in a predetermined charging time zone. In addition, the off condition of the fourth switch 70 is that a power failure occurs and a predetermined charging time zone is set. The on / off control of the fourth switch 70 (determination of whether the fourth switch 70 satisfies the on condition or the off condition) is performed by the first unit 30 as shown in FIG. This is performed by the inverter 33. The predetermined charging time period is, for example, a time period from 23:00 to 7:00, as described later.

  The second unit 80 shown in FIGS. 1 and 2 is one of the sources of supplying power to the load 2. The second unit 80 includes a second power storage device 82, a second inverter 83, and the like.

  The configuration of the second power storage device 82 and the second power conditioner 83 (specifically, their own configurations and the configuration relating to each other) are the same as those of the first power storage device 32 and the first power conditioner 33. Since the configuration is substantially the same, the description will be made focusing on the different points.

  The second inverter 83 is connected to the second power storage device 82 via a predetermined distribution line. The second inverter 83 is electrically connected to the second sensor 22. The second inverter 83 is configured to receive a signal output from the second sensor 22 and acquire a detection result of the second sensor 22 based on the input signal. The second inverter 83 can perform a load following operation that adjusts the amount of electric power to be output based on the obtained detection result of the second sensor 22. In addition, the second inverter 83 can acquire information on occurrence of a power failure based on the acquired detection result of the second sensor 22. The second inverter 83 can perform an interconnection operation and an independent operation.

  In addition, the interconnection operation of the second power conditioner 83 includes a normal interconnection operation performed in a state of being normally connected to the commercial power supply 3 and a pseudo interconnection performed in a state of being simulatedly connected to the commercial power supply 3 during a power failure. Interconnection operation. In the present embodiment, the state of being pseudo-interconnected with the commercial power supply 3 means that the power output from the first unit 30 is regarded as the power from the commercial power supply 3, and the first power supply is not actually the commercial power supply 3 but the first power supply 3. The operation is performed in connection with the unit 30.

  In this way, the second inverter 83 performs the normal interconnection operation, so that the electric power discharged from the second power storage device 82 via the distribution line L4 described below is connected to the commercial power supply 3 in the normal state. It can output or input (charge) electric power from the commercial power supply 3 and the first unit 30 to the second power storage device 82.

  In addition, by performing the pseudo-interconnection operation, the second power conditioner 83 is connected to the commercial power supply 3 in an emergency, so that the power discharged from the second power storage device 82 via the distribution line L4 in an emergency state. And the power from the first unit 30 can be input (charged) to the second power storage device 82.

  In addition, the second power conditioner 83 outputs the electric power discharged from the second power storage device 82 via the distribution line L7 described below in a state independent of the commercial power supply 3 in an emergency by performing the independent operation. Can be.

  The second unit 80 configured as described above is connected to the distribution board 10 via the distribution line L4.

  More specifically, in the second unit 80, the second inverter 83 is connected to the distribution line L1 (between the second sensor 22 and the third sensor 23) in the distribution board 10 via the distribution line L4. Connected to Thus, the second inverter 83 is connected to the commercial power supply 3 and the load 2 via the distribution lines L4 and L1. The second inverter 83 is connected to the first unit 30 via the distribution lines L4, L1, and L2 (or the distribution lines L4, L1, and L3). Thereby, the second inverter 83 can charge the second power storage device 82 with the electric power from the commercial power supply 3 when a predetermined charging time period described later is reached. The distribution line L4 is a distribution line used during the interconnection operation of the second power conditioner 83 (normal interconnection operation and pseudo interconnection operation). Further, a second breaker 12 is provided on the distribution line L4. The second breaker 12 prohibits the flow (interrupts the circuit) when power (current) exceeding a specified value flows.

  In addition, the second unit 80 includes a second switching panel 110 (more specifically, a second switching panel connected to an intermediate part of the distribution line L1), which will be described later, outside the distribution panel 10 via the distribution line L7. 111). The second switching board 111 is connected to the load 121 of the loads 2. Thus, in the second unit 80, the second inverter 83 is connected to the load 121 of the loads 2 via the distribution line L7. Note that the distribution line L7 is a distribution line used when the second power conditioner 83 operates independently.

  The third unit 90 shown in FIGS. 1 and 2 is one of the sources of supplying power to the load 2. The third unit 90 includes a third power storage device 92, a third inverter 93, and the like.

  The configuration of the third power storage device 92 and the third power conditioner 93 (specifically, their own configurations and the configuration relating to each other) are the same as those of the first power storage device 32 and the first power conditioner 33. Since the configuration is substantially the same, the description will be made focusing on the different points.

  The third inverter 93 is connected to the third power storage device 92 via a predetermined distribution line. The third inverter 93 is electrically connected to the third sensor 23. The third inverter 53 is configured to receive a signal output from the third sensor 23 and acquire a detection result of the third sensor 23 based on the input signal. The third inverter 93 can perform a load following operation that adjusts the amount of electric power to be output based on the acquired detection result of the third sensor 23. In addition, the third inverter 93 can acquire information on the occurrence of a power failure based on the acquired detection result of the third sensor 23. The third inverter 93 can perform the interconnection operation and the independent operation.

  The interconnection operation of the third power conditioner 93 includes a normal interconnection operation performed in a state of being normally connected to the commercial power supply 3 and a pseudo interconnection performed in a state of being simulatedly connected to the commercial power supply 3 during a power failure. Interconnection operation.

  In this way, the third inverter 93 performs the normal interconnection operation, so that the electric power discharged from the third power storage device 92 via the later-described distribution line L5 in a state of being normally connected to the commercial power supply 3 is performed. The power can be output or the power from the commercial power supply 3 or the first unit 30 can be input (charged) to the third power storage device 92.

  In addition, by performing the pseudo interconnection operation, the third power conditioner 93 is connected to the commercial power supply 3 in an emergency, so that the power discharged from the third power storage device 92 via the distribution line L5 in an emergency state. And the power from the first unit 30 can be input (charged) to the third power storage device 92.

  In addition, the third power conditioner 93 outputs the power discharged from the third power storage device 92 via the distribution line L8 described later in a state independent of the commercial power supply 3 in an emergency by performing the self-sustaining operation. Can be.

  The third unit 90 configured as described above is connected to the distribution board 10 via the distribution line L5.

  More specifically, in the third unit 90, the third inverter 93 is connected to the distribution line L1 (between the third sensor 23 and the fourth sensor 24) in the distribution board 10 via the distribution line L5. Connected to Thus, the third inverter 93 is connected to the commercial power supply 3 and the load 2 via the distribution lines L5 and L1. The third inverter 93 is connected to the first unit 30 via the distribution lines L5, L1, and L2 (or the distribution lines L5, L1, and L3). Accordingly, the third power conditioner 93 can charge the third power storage device 92 with the electric power from the commercial power supply 3 when a predetermined charging time period described later is reached. Note that the distribution line L5 is a distribution line used during the interconnection operation of the third inverter 93 (normal interconnection operation and pseudo interconnection operation). A third breaker 13 is provided on the distribution line L5. The third breaker 13 prohibits the flow (interrupts the circuit) when the power (current) exceeding the specified value flows.

  In addition, the third unit 90 includes a second switching panel 110 (described in more detail below) outside the distribution board 10 via the distribution line L8 (more specifically, a second switching panel connected to an intermediate portion of the distribution line L1). 112). In this way, in the third unit 90, the third inverter 93 is connected to the load 122 of the loads 2 via the distribution line L8. Note that the distribution line L8 is a distribution line used when the third inverter 93 operates independently.

  The fourth unit 100 shown in FIGS. 1 and 2 is one of the sources of supplying power to the load 2. The fourth unit 100 includes a fourth power storage device 102, a fourth inverter 103, and the like.

  Note that the configurations of the fourth power storage device 102 and the fourth power conditioner 103 (specifically, their own configurations and configurations relating to each other) are the same as those of the first power storage device 32 and the first power conditioner 33. Since the configuration is substantially the same, the description will be made focusing on the different points.

  Fourth inverter 103 is connected to fourth power storage device 102 via a predetermined distribution line. The fourth inverter 103 is electrically connected to the fourth sensor 24. The fourth power conditioner 103 is configured to receive a signal output from the fourth sensor 24 and acquire a detection result of the fourth sensor 24 based on the input signal. The fourth inverter 103 can perform a load following operation that adjusts the amount of electric power to be output based on the acquired detection result of the fourth sensor 24. In addition, the fourth inverter 103 can acquire information about the occurrence of a power failure based on the acquired detection result of the fourth sensor 24. The fourth inverter 103 can perform an interconnection operation and an independent operation.

  The interconnection operation of the fourth power conditioner 103 includes a normal interconnection operation performed in a state of being normally connected to the commercial power supply 3 and a pseudo interconnection performed in a state of being simulatedly connected to the commercial power supply 3 during a power failure. Interconnection operation.

  In this way, the fourth power conditioner 103 performs the normal interconnection operation, so that the power discharged from the fourth power storage device 102 via the later-described distribution line L6 in a state of being normally connected to the commercial power supply 3 is provided. It can output or input (charge) electric power from the commercial power supply 3 or the first unit 30 to the fourth power storage device 102.

  In addition, by performing the pseudo interconnection operation, the fourth power conditioner 103 is connected to the commercial power supply 3 in an emergency, so that the electric power discharged from the fourth power storage device 102 via the distribution line L6 in an emergency state. And the power from the first unit 30 can be input (charged) to the fourth power storage device 102.

  In addition, the fourth power conditioner 103 outputs the power discharged from the fourth power storage device 102 via the distribution line L9 described below, in a state independent of the commercial power supply 3 in an emergency, by performing the self-sustaining operation. Can be.

  The fourth unit 100 configured as described above is connected to the distribution board 10 via the distribution line L6.

  More specifically, in the fourth unit 100, the fourth inverter 103 is connected to the distribution line L1 (the load 2 side of the fourth sensor 24) in the distribution board 10 via the distribution line L6. . Thus, the fourth inverter 103 is connected to the commercial power supply 3 and the load 2 via the distribution lines L6 and L1. The fourth inverter 103 is connected to the first unit 30 via the distribution lines L6, L1, and L2 (or the distribution lines L6, L1, and L3). Thus, the fourth power conditioner 103 can charge the fourth power storage device 102 with the electric power from the commercial power supply 3 when a predetermined charging time period described later is reached. The distribution line L6 is a distribution line used for the interconnection operation of the fourth power conditioner 103 (normal interconnection operation and pseudo interconnection operation). Further, a fourth breaker 14 is provided on the distribution line L6. The fourth breaker 14 inhibits the flow (interrupts the circuit) when power (current) exceeding a specified value flows.

  In addition, the fourth unit 100 includes a second switching panel 110 (described in more detail below) outside the distribution board 10 via the distribution line L9 (more specifically, a second switching panel connected to an intermediate portion of the distribution line L1). 113). Thus, in the fourth unit 100, the fourth inverter 103 is connected to the load 123 of the loads 2 via the distribution line L9. The distribution line L9 is a distribution line used when the fourth power conditioner 103 operates independently.

  As described above, in the power supply system 1, the first unit 30, the second unit 80, the third unit 90, and the fourth unit 100 configured to be able to input and output electric power are connected to the commercial power 3 are connected in order from the load 2 side (downstream side).

  The second switchboard 110 shown in FIGS. 1 and 2 switches the supply source of the power flowing to the load 2 via the second switchboard 110 as appropriate. More specifically, the second switching panel 110 includes a second switching panel 111, a second switching panel 112, and a second switching panel 113. The second switching panel 110 appropriately controls the supply sources of power flowing to the loads 121, 122 and 123 via the second switching panel 111, the second switching panel 112, and the second switching panel 113, respectively. Switch. The second switchboard 111, the second switchboard 112, and the second switchboard 113 are provided in the middle of the distribution line L1 (between the distribution board 10 and the load 121, the load 122, and the load 123). Can be The second switchboard 111 is connected to the downstream side (load 121 side) of the second switchboard 111 with either the upstream side of the second switchboard 111 of the distribution line L1 or one of the distribution lines L7. Connecting. In addition, the second switchboard 112 is located downstream of the second switchboard 112 (on the load 122 side), upstream of the second switchboard 112 of the distribution line L1, or one of the distribution lines L8. Connect with one. In addition, the second switching panel 113 is located downstream of the second switching panel 113 (on the load 123 side), upstream of the second switching panel 113 of the distribution line L1, or one of the distribution lines L9. Connect with one. The switching control of the second switching panel 110 (the second switching panel 111, the second switching panel 112, and the second switching panel 113) is performed by the first inverter 33 of the first unit 30.

  Hereinafter, a power supply mode of the power supply system 1 in a normal state will be described.

  As shown in FIG. 1, in a normal state, in the first switching panel 50, the first switch 51 is turned off and the second switch 52 is turned on, so that the upstream side of the distribution line L1 is turned on. And the downstream side are connected. Further, the third switch 60 is turned on when the ON condition is satisfied, and the flow of electric power is permitted. Further, the fourth switch 70 is turned on when the ON condition is satisfied, and the flow of power is permitted.

  In a normal time, the electric power from the commercial power supply 3 is supplied to the distribution board 10 via the distribution line L1, and then to the load 2. In this case, in the fourth unit 100 disposed on the most downstream side (the load 2 side), the fourth power conditioner 103 performs a load following operation based on the detection result of the fourth sensor 24 and performs a predetermined operation. Outputs the amount of power. Thus, the electric power output from the fourth unit 100 (the fourth inverter 103) is supplied to the load 2 via the distribution lines L6 and L1. When power is supplied from the fourth unit 100 to the load 2, the amount of power supplied from the commercial power supply 3 to the load 2 decreases.

  Further, when the power consumption of the load 2 cannot be covered only by the power from the fourth unit 100, the insufficient power is supplied from the commercial power supply 3 to the load 2. That is, the electric power from the commercial power supply 3 (insufficient electric power) is supplied to the distribution board 10 via the distribution line L1 and then to the load 2. In this case, in the third unit 90 that is secondly arranged on the downstream side (load 2 side), the third inverter 93 performs a load following operation based on the detection result of the third sensor 23, A predetermined amount of power is output. Thus, the electric power output from the third unit 90 (the third inverter 93) is supplied to the load 2 via the distribution lines L5 and L1. When power is supplied from the third unit 90 to the load 2, the amount of power supplied from the commercial power supply 3 to the load 2 further decreases.

  Further, when the power consumption of the load 2 cannot be covered only by the power from the third unit 90 and the fourth unit 100, the insufficient power is supplied from the commercial power supply 3 to the load 2. That is, the electric power from the commercial power supply 3 (insufficient electric power) is supplied to the distribution board 10 via the distribution line L1 and then to the load 2. In this case, in the second unit 80 that is thirdly arranged on the downstream side (load 2 side), the second inverter 83 performs the load following operation based on the detection result of the second sensor 22, A predetermined amount of power is output. Thus, the electric power output from the second unit 80 (the second inverter 83) is supplied to the load 2 via the distribution lines L4 and L1. When power is supplied from the second unit 80 to the load 2, the amount of power supplied from the commercial power supply 3 to the load 2 further decreases.

  Further, when the power consumption of the load 2 cannot be covered only by the power from the second unit 80, the third unit 90, and the fourth unit 100, the insufficient power is supplied from the commercial power supply 3 to the load 2. Supplied. That is, the electric power from the commercial power supply 3 (insufficient electric power) is supplied to the distribution board 10 via the distribution line L1 and then to the load 2. In this case, in the first unit 30 arranged at the most upstream side (commercial power supply 3 side), the first inverter 33 performs a load following operation based on the detection result of the first sensor 21 and performs a predetermined operation. The power of the power amount is output. Thus, the electric power output from the first unit 30 (the first inverter 33) is supplied to the load 2 via the distribution lines L2 and L1. When power is supplied from the first unit 30 to the load 2, the amount of power supplied from the commercial power supply 3 to the load 2 further decreases.

  As described above, in the normal time (when the normal interconnection operation of the second inverter 83, the third inverter 93, and the fourth inverter 103 is performed), the power consumption of the load 2 The power from the fourth unit 100, the third unit 90, the second unit 80, and the first unit 30 can be sequentially output, and the amount of power supplied from the commercial power supply 3 to the load 2 (commercial power supply 3 The amount of power purchased from the company).

  Further, for example, with respect to the power consumption of the load 2, the first unit 30 outputs the first sunlight in a state where the power from the fourth unit 100, the third unit 90, and the second unit 80 is sequentially output. When a surplus occurs in the power generated by the power generation device 31, the first power storage device 32 can be charged with the surplus power. Further, the power consumption of the load 2 is covered only by the power from the unit such as the fourth unit 100 and the power is generated by the first solar power generation device 31 of the first unit 30. When the surplus power is generated, the surplus power can be charged to the second power storage device 82 and the like of the second unit 80 (that is, a power storage device that is not outputting).

  As described above, when it is normal time, the first solar power generation device 31 generates power as power output from the first unit 30, the second unit 80, the third unit 90, and the fourth unit 100. The stored power can be charged in the first power storage device 32, the second power storage device 82, the third power storage device 92, and the fourth power storage device 102, and supplied from the commercial power source 3 to the load 2. (The amount of power purchased from the commercial power supply 3) can be reduced.

  Also, in the case of normal time, a relatively late night charge is applied in a predetermined charging time period (for example, a time period of late night when power consumption of the factory is small, for example, a time period from 23:00 to 7:00). The power from the inexpensive commercial power supply 3 is used as the power output from the first unit 30, the second unit 80, the third unit 90, and the fourth unit 100, and the first power storage device 32, The power storage device 82, the third power storage device 92, and the fourth power storage device 102 can be charged. In this way, by discharging the charged electric power during the daytime (to which no midnight rates are applied), it is possible to reduce the amount of relatively expensive electric power purchased.

  Hereinafter, a power supply mode of the power supply system 1 during a power outage will be described with reference to FIGS. 3 to 6.

  In the following, it is assumed that a power failure occurs during a time period other than the predetermined charging time period (for example, at 12:00). When a power failure occurs, the supply of power from the commercial power supply 3 is stopped as shown in FIG. In this case, the first inverter 33 of the first unit 30 acquires information on the occurrence of a power failure based on the detection result of the first sensor 21. In this way, when a power failure occurs, the first inverter 33 ends the interconnection operation.

  In addition, when a power failure occurs, the first inverter 33 controls switching of the second switching panel 110. Specifically, the second switching board 111 connects the downstream side (load 121 side) of the second switching board 111 to the distribution line L7. The second switching panel 112 connects the downstream side (load 122 side) of the second switching panel 112 to the distribution line L8. The second switching panel 113 connects the downstream side (load 123 side) of the second switching panel 113 to the distribution line L9. In this way, the supply source of the power flowing to the load 2 via the second switching panel 110 is switched to the second unit 80, the third unit 90, and the fourth unit 100 during the self-sustaining operation.

  When a power failure occurs, the second inverter 83 of the second unit 80, the third inverter 93 of the third unit 90, and the fourth inverter 103 of the fourth unit 100 are connected to the second sensor, respectively. 22, information about the occurrence of a power failure is obtained based on the detection results of the third sensor 23 and the fourth sensor 24. Thus, the second inverter 83, the third inverter 93, and the fourth inverter 103 terminate the interconnection operation (normal interconnection operation) and start the independent operation. In this manner, when the independent operation of the second inverter 83, the third inverter 93, and the fourth inverter 103 is started, as shown in FIG. 3, the second inverter 83, the third inverter 93, and the fourth inverter The power output from the power conditioner 103 is supplied to the load 121, the load 122, and the load 123 via the distribution lines L7, L8, and L9, respectively.

  In addition, the first inverter 33 controls switching of the first switching panel 50 when a power failure occurs. More specifically, as shown in FIG. 3, the first inverter 33 turns on the first switch 51 and turns off the second switch 52 in the first switchboard 50, thereby distributing the distribution line L <b> 1. Is connected to the downstream side of the first switchboard 50 and the distribution line L3. Thus, the supply source of the electric power flowing to the load 2 via the first switching panel 50 is switched to the first unit 30 during the self-sustaining operation.

  In addition, the first power conditioner 33 starts the self-sustaining operation after a lapse of a predetermined period (after the switching control of the first switching panel 50 is performed) after the end of the interconnection operation. When the self-sustaining operation of the first inverter 33 is started in this way, as shown in FIG. 4, the electric power output from the first inverter 33 flows through the distribution line L3 and is boosted by the transformer 40.

  When a power failure occurs, the first inverter 33 performs on / off control of the third switch 60 and the fourth switch 70.

  Specifically, as shown in FIG. 3, the first inverter 33 determines that the ON condition of the fourth switch 70 (that is, at the time of a power failure and not in a predetermined charging time zone) is satisfied. Then, the fourth switch 70 is turned on to permit the flow of electric power.

  Also, as shown in FIG. 3, the first power conditioner 33 turns off the third switch 60 (the first operation by the independent operation at the time of the power failure) until the independent operation is started after the interconnection operation is completed. It is determined that the power from the power conditioner 33 (power from the first unit 30 is not output) is satisfied, and the third switch 60 is turned off to prohibit the flow of power. Then, as shown in FIG. 4, the first power conditioner 33 starts the self-sustaining operation and outputs power so as to flow through the distribution line L3. It is determined that the power from one power conditioner 33 (power from the first unit 30 is being output) is satisfied, and the third switch 60 is turned on to permit the flow of power.

  When the independent operation of the first inverter 33 is started in this way, as shown in FIG. 4, the electric power output from the first inverter 33 is supplied to the load 2 via the distribution lines L3 and L1.

  When the power output from the first inverter 33 by the self-sustaining operation is supplied to the load 2 via the distribution lines L3 and L1, the second inverter 83 of the second unit 80 and the third unit 90 The third power conditioner 93 and the fourth power conditioner 103 of the fourth unit 100 actually cause a power failure based on the detection results of the second sensor 22, the third sensor 23, and the fourth sensor 24, respectively. Even though the power failure has not been resolved, information as if the power failure had been resolved (hereinafter, referred to as “pseudo blackout electrolysis deactivation information”) is acquired.

  In this way, when the second power conditioner 83, the third power conditioner 93, and the fourth power conditioner 103 acquire the pseudo power cut-off information in the event of a power failure, the self-sustaining operation is terminated and the interconnection operation is started. In this case, the interconnection operation is performed by assuming the electric power output from the first unit 30 as the electric power from the commercial power supply 3 and actually interconnecting with the first unit 30 instead of the commercial power supply 3. (Pseudo interconnection operation).

  As a result, as shown in FIG. 5, the power consumption of the load 2 is reduced by the fourth unit 100 and the third unit 90 in the same manner as during normal operation (that is, when the normal interconnection operation is performed). , The second unit 80 and the power from the first unit 30 can be sequentially output. That is, when the simulated interconnection operation of the second inverter 83, the third inverter 93, and the fourth inverter 103 is started, the power consumption of the load 2 is reduced from the downstream unit (for example, the fourth unit 100). When the power cannot be supplied only by the power of the first unit 30, the power control of the upstream unit (for example, the third power control 93 of the third unit 90) is performed based on the power from the first unit 30 (power that is insufficient). Performs a load following operation and outputs a predetermined amount of power.

  In addition, after the output of the electric power from the first inverter 33 by the self-sustaining operation is started, when the electric power that can be output in the first inverter 33 is exhausted, the second inverter 83, the third inverter 93, and The fourth inverter 103 ends the pseudo-interconnection operation, and starts an independent operation.

  As described above, after the output of the power from the first inverter 33 by the self-sustaining operation is started, the output of the electric power from the first inverter 33 may be stopped for some reason.

  In the following, referring to FIG. 6, the power supply system in the case where the output of the power from the first inverter 33 is stopped for some reason after the output of the electric power from the first inverter 33 by the self-sustaining operation is started. One power supply mode will be described.

  In such a case, the first inverter 33 performs on / off control of the third switch 60. Specifically, as shown in FIG. 6, the first power conditioner 33 performs an autonomous operation when the third switch 60 is turned off (during a power outage and in the first unit 30). Therefore, the third switch 60 is turned off to prohibit the flow of power.

  In this manner, when the power output from the first inverter 33 stops flowing through the third switch 60 (distribution line L1) by the self-sustaining operation, the second inverter 83 of the second unit 80 and the third unit 90 The third power control 93 and the fourth power control 103 of the fourth unit 100 output information on the occurrence of a power failure based on the detection results of the second sensor 22, the third sensor 23, and the fourth sensor 24, respectively. get. Thus, the second inverter 83, the third inverter 93, and the fourth inverter 103 terminate the interconnection operation (pseudo interconnection operation) and start the independent operation. When the independent operation of the second inverter 83, the third inverter 93 and the fourth inverter 103 is started, as shown in FIG. 6, the second inverter 83, the third inverter 93 and the fourth inverter 103 are turned on. Are supplied to the load 121, the load 122, and the load 123 via the distribution lines L7, L8, and L9, respectively.

  As described above, in the present embodiment, the third switch 60 is turned on when the output of the power from the first inverter 33 in the self-sustaining operation is started, and is turned off once for some reason. Even if it is determined that the ON condition is satisfied, the control is performed so that the power is not turned ON again until the power failure is resolved. As a result, even if the cause is eliminated and the power output from the first inverter 33 is started again by the self-sustaining operation, the electric power output from the first inverter 33 is maintained at the third switch 60. (Distribution line L1) will not flow.

  With such a configuration, even if the stop and start of the output of the electric power by the independent operation are repeated by the first inverter 33 for some reason, the output electric power flows through the distribution line L1. Therefore, the second inverter 83 of the second unit 80, the third inverter 93 of the third unit 90, and the fourth inverter 103 of the fourth unit 100 are connected to the second sensor 22 and the third sensor 22, respectively. No false stoppage information is obtained based on the detection results of the sensor 23 and the fourth sensor 24. That is, the second power conditioner 83, the third power conditioner 93, and the fourth power conditioner 103 end the self-sustaining operation and start the pseudo interconnected operation, or end the pseudo interconnected operation and start the independent operation. And complicated operation can be prevented.

  In the present embodiment, when the third switch 60 is turned on after the output of the power from the first inverter 33 in the self-sustaining operation is started, if the power is once turned off for some reason, the power failure is resolved thereafter. Until the power is turned off, the power is controlled so that the power may not be turned on again. However, the power may be turned on again by a manual operation even if the power failure has not been resolved.

  Hereinafter, a power supply mode of the power supply system 1 when a power failure occurs in a predetermined charging time zone will be described with reference to FIG.

  In the power supply mode of the power supply system 1 when a power failure occurs during a predetermined charging time period, the power failure occurs during a time period other than the predetermined charging time period (for example, 12:00). The ON / OFF control of the fourth switch 70 is different from the case.

  Specifically, as shown in FIG. 7, the first inverter 33 determines that the fourth switch 70 satisfies the OFF condition (at the time of a power failure and in a predetermined charging time zone). Then, the fourth switch 70 is turned off to prohibit the flow of electric power.

  In this way, if the power output from the first inverter 33 by the self-sustaining operation does not flow through the fourth switch 70 (distribution line L1), the second inverter 83 of the second unit 80 and the third inverter 90 of the third unit 90 The third power conditioner 93 and the fourth power conditioner 103 of the fourth unit 100 obtain information on the occurrence of a power failure based on the detection results of the second sensor 22, the third sensor 23, and the fourth sensor 24, respectively. I do. Thus, the second inverter 83, the third inverter 93, and the fourth inverter 103 end the interconnection operation (normal interconnection operation) and start the self-sustaining operation. When the independent operation of the second inverter 83, the third inverter 93, and the fourth inverter 103 starts, as shown in FIG. 7, the second inverter 83, the third inverter 93, and the fourth inverter 103 Are supplied to the load 121, the load 122, and the load 123 via the distribution lines L7, L8, and L9, respectively.

  As described above, in the power supply system 1, by performing simple control according to the time zone, when a power failure occurs in a predetermined charging time zone, the second power conditioner 83, the third power conditioner 93, and the third power conditioner The fourth inverter 103 is set so as not to start the interconnection operation (pseudo interconnection operation). Thus, the power output from the first unit 30 (not the power from the commercial power supply 3) is charged to the second power storage device 82, the third power storage device 92, and the fourth power storage device 102. Can be prevented. In this way, when a power failure occurs, it is possible to prevent a limited amount of power from being charged from the first unit 30 to the plurality of power storage devices, and to prevent the system from going down. .

  Hereinafter, a power supply system 200 according to the second embodiment will be described with reference to FIG.

  FIG. 8 is a block diagram showing a configuration of the second switching panel 110 (second switching panel 111) and the load 2 (load 121) in the power supply system 200 according to the second embodiment. Further, the power supply system 200 according to the second embodiment differs from the power supply system 1 according to the first embodiment in the setting of the load 121 and the configuration of the second switching panel 111. In the following, for convenience, the description will be made assuming that the distribution line connecting the second switchboard 111 and the load 121 is different from the power supply system 1 according to the first embodiment.

  As shown in FIG. 8, the load 121 includes three types of loads that are set in advance according to the necessity of supplying power during a power outage. Specifically, the load 121 includes a general load 121a, a first important load 121b, and a second important load 121c. The general load 121a is a load having a relatively small necessity to continue supplying power during a power outage. The second important load 121c is a load for which it is relatively necessary to continue supplying power even during a power outage. The first important load 121b is a load for which the necessity of continuing to supply power even during a power outage is relatively large (greater than the second important load 121c).

  The general load 121a is arranged at the downstream end of the distribution line L1. The second important load 121c is arranged at a downstream end of the distribution line L7. The first important load 121b is connected to a downstream end of a distribution line L7a described later. The distribution line L7a is a distribution line connected such that the downstream side of the distribution line L7 branches. The upstream end of the distribution line L7a is connected to a middle part (contact point 221) of the distribution line L7 in the second switchboard 111.

  The second switchboard 111 shown in FIG. 8 switches the supply source of the electric power flowing to the load 2 via the second switchboard 111 as appropriate. The second switchboard 111 includes a first switchboard switch 211, a second switchboard switch 212, a third switchboard switch 213, a fourth switchboard switch 214, and the like.

  The first switchboard switch 211 is disposed in the second switchboard 111 at an intermediate portion of the distribution line L1. In addition, the third switchboard switch 213 is arranged in the second switchboard 111 in the middle of the distribution line L7. The second switchboard switch 212 is arranged in the second switchboard 111 at an intermediate portion of the distribution line L1a described later. The distribution line L1a is a distribution line that connects the distribution line L1 and the distribution line L7. The upstream end of the distribution line L1a is connected to a middle part (contact point 222) of the distribution line L1. The contact 222 is arranged on the distribution line L1 on the upstream side of the first switchboard switch 211. The downstream end of the distribution line L1a is connected to a middle part (contact point 223) of the distribution line L7. The contact 223 is disposed between the third switchboard switch 213 and the contact 221 on the distribution line L7. The fourth switchboard switch 214 is disposed in the middle of the distribution line L7 (downstream from the contact 221) in the second switchboard 111.

  The first switchboard switch 211, the second switchboard switch 212, the third switchboard switch 213, and the fourth switchboard switch 214 turn on / off (permit or prohibit) the flow of electric power at the location. It is. The first switchboard switch 211, the second switchboard switch 212, the third switchboard switch 213, and the fourth switchboard switch 214 are turned on when a predetermined on condition is satisfied, and the flow of power at the location where the switch is arranged is established. Allow Also, the first switchboard switch 211, the second switchboard switch 212, the third switchboard switch 213, and the fourth switchboard switch 214 are turned off when a predetermined off condition is satisfied, and the Prohibit the distribution of

  The ON condition of the first switchboard switch 211 is that it is normal time. In addition, the off condition of the first switchboard switch 211 is that a power failure occurs.

  The ON condition of the second switchboard switch 212 is that the normal condition or that the second power conditioner 83, the third power conditioner 93, and the fourth power conditioner 103 are not operating independently during a power failure. Either. In addition, the off condition of the second switchboard switch 212 is that the second inverter 83, the third inverter 93, and the fourth inverter 103 are operating independently during a power failure.

  The ON condition of the third switchboard switch 213 is that the second inverter 83, the third inverter 93, and the fourth inverter 103 are operating independently during a power failure. Further, the off condition of the third switchboard switch 213 is that the normal condition, or that the second power conditioner 83, the third power conditioner 93, and the fourth power conditioner 103 are not operating independently during a power failure. , Or

  In this way, the ON / OFF of the second switchboard switch 212 and the third switchboard switch 213 are set so as to be mutually exclusive. Specifically, when the second switchboard switch 212 is turned on, the third switchboard switch 213 is turned off. When the second switchboard switch 212 is turned off, the third switchboard switch 213 is turned on.

  The ON condition of the fourth switchboard switch 214 is either a normal state or a predetermined period after the occurrence of a power failure. The off condition of the fourth switchboard switch 214 is that a predetermined period has not elapsed after the occurrence of the power failure. Note that the predetermined period is defined as a period after the second inverter 83, the third inverter 93, and the fourth inverter 103 have acquired the information regarding the occurrence of the power failure, after the second sensor 22, the third sensor 23, and the third sensor 23, respectively. And a period until the pseudo-interconnection operation is started based on the detection result of the fourth sensor 24 (that is, a period during which the self-sustaining operation is performed), for example, 5 minutes.

  On / off control of the first switchboard switch 211, the second switchboard switch 212, the third switchboard switch 213, and the fourth switchboard switch 214 (each switch satisfies the on condition or the off condition) Is determined by the first inverter 33 of the first unit 30.

  Hereinafter, a power supply mode of the power supply system 200 according to the second embodiment in a normal state will be described with reference to FIG.

  As shown in FIG. 9A, in the normal state, the second switchboard switch 212 of the second switchboard 111 is turned on and the third switchboard switch 213 is turned off. The power distribution of the third switchboard switch 213 is prohibited, and the power distribution of the second switchboard switch 212 (between the distribution line L1 and the distribution line L7) is permitted. Also, the first switchboard switch 211 satisfies the ON condition and is turned ON, and the flow of power is permitted. Further, the fourth switchboard switch 214 satisfies the on condition and is turned on, and the flow of electric power is permitted.

  Thus, in the normal state, the power supplied to the second switching board 111 via the distribution line L1 is applied to all the loads (the general load 121a, the first important load 121b, and the second important load 121c). Supplied.

  Hereinafter, a power supply mode of the power supply system 200 according to the second embodiment during a power outage will be described with reference to FIGS. 9B and 9C.

  FIG. 9B is a block diagram illustrating a power supply mode when a predetermined period has not elapsed after the occurrence of a power failure. More specifically, FIG. 9B shows a state in which less than 5 minutes have passed since the occurrence of the power failure, that is, the second power control 83, the third power control 93, and the fourth power control 103 provide information on the occurrence of the power failure. This shows a state in which self-sustaining operation is performed after the acquisition.

  In this way, as shown in FIG. 9B, when less than 5 minutes have passed since the occurrence of the power failure, in the second switching board 111, the second switching board switch 212 is turned off. When the switch 213 is turned on, the power distribution of the second switchboard switch 212 (between the distribution line L1 and the distribution line L7) is prohibited, and the power distribution of the third switchboard switch 213 is permitted. Have been. Further, the first switchboard switch 211 satisfies the off condition and is turned off, and the flow of power is prohibited. Further, the fourth switchboard switch 214 satisfies the off condition and is turned off, and the flow of power is prohibited.

  In this way, when less than 5 minutes have passed since the occurrence of the power failure, the power supplied to the second switching board 111 via the distribution line L7 is applied to all the loads (the general load 121a, the first important load 121b, and the The second important load 121c) is supplied to the first important load 121b.

  FIG. 9C is a block diagram illustrating a power supply mode when a predetermined period has elapsed after the occurrence of a power failure. More specifically, FIG. 9C shows a state in which five minutes have passed since the occurrence of the power failure, that is, the second power control 83, the third power control 93, and the fourth power control 103 provide information on the occurrence of the power failure. This shows a state in which the pseudo-interconnection operation has been started based on the detection results of the second sensor 22, the third sensor 23, and the fourth sensor 24 after the acquisition and the self-sustaining operation are performed.

  In this way, as shown in FIG. 9C, when five minutes have elapsed since the occurrence of the power failure, the second switchboard switch 212 of the second switchboard 111 is turned on and the third switchboard switch 213 is turned on. Is turned off, the power distribution of the third switchboard switch 213 is prohibited, and the power distribution of the second switchboard switch 212 (between the distribution line L1 and the distribution line L7) is permitted. ing. Further, the first switchboard switch 211 satisfies the off condition and is turned off, and the flow of power is prohibited. Further, the fourth switchboard switch 214 satisfies the on condition and is turned on, and the flow of electric power is permitted.

  In this way, when 5 minutes have elapsed since the occurrence of the power failure, the power supplied to the second switching board 111 via the distribution line L1 is equal to all loads (the general load 121a, the first important load 121b, and the second Are supplied to the first important load 121b and the second important load 121c.

  As described above, in the power supply system 200 according to the second embodiment, the power supplied to the second switching panel 111 via the distribution line L1 during all times is normal (normal load 121a). , A first important load 121b and a second important load 121c). However, in the case of a power failure, the power supplied to the second switching panel 111 is supplied to only the first important load 121b or the first power to the first important load 121b depending on the period after the power failure occurs. It is supplied to the important load 121b and the second important load 121c.

  Thereby, when less than 5 minutes have elapsed since the occurrence of the power failure, that is, when the power from the second inverter 83 during the self-sustaining operation is supplied to the second switching panel 111 via the distribution line L7, Electric power from the distribution line L7 can be supplied only to the first important load 121b. That is, even when the amount of power supplied to the second switching panel 111 is relatively small, or even during a power outage, there is a relatively large need to continue supplying power (the second important load 121c). It is possible to avoid the inconvenience that power is not supplied to the first important load 121b.

  When five minutes have elapsed since the occurrence of the power failure, that is, the power from the second power converter 83, the third power controller 93, and the fourth power controller 103 during the pseudo interconnection operation via the distribution line L1 is reduced to the second power. Is supplied to the switching board 111, the power from the distribution line L1 can be supplied to the first important load 121b and the second important load 121c. That is, if the amount of power supplied to the second switching board 111 is relatively large even during a power failure, the power supply is continued not only during the first power failure but also during the power failure. It is also possible to supply electric power to the second important load 121c, which needs to be relatively large.

  As described above, in the description of the power supply system 200 according to the second embodiment with reference to FIGS. 8 and 9, the configurations of the second switching panel 111 and the load 121 have been adopted. The same configuration as the second switching board 111 and the load 121 can be adopted also in the 112 and the load 122 and the second switching board 113 and the load 123.

  Hereinafter, a power supply system 300 according to the third embodiment will be described with reference to FIGS. 10 and 11.

  In the power supply system 300 according to the third embodiment, the configurations of the second unit 80, the third unit 90, and the fourth unit 100 are different from those of the power supply system 1 according to the first embodiment. ing.

  Specifically, in the power supply system 300 according to the third embodiment, the second unit 80 includes the second power storage device 82 and the second power conditioner 83 similar to the power supply system 1 and a second A photovoltaic power generation device 81 and a second unit switching panel 84 are provided. The second unit switching panel 84 includes a second unit switch 85 (see FIG. 11).

  Further, the third unit 90 includes a third solar power generation device 91 and a third unit switching panel 94 in addition to the third power storage device 92 and the third power conditioner 93 similar to the power supply system 1. . The third unit switching panel 94 includes a third unit switch 95 (see FIG. 11).

  Further, the fourth unit 100 includes a fourth solar power generation device 101 and a fourth unit switching panel 104 in addition to the fourth power storage device 102 and the fourth power conditioner 103 similar to the power supply system 1. . The fourth unit switching panel 104 includes a fourth unit switch 105 (see FIG. 11).

  The second solar power generation device 81 and the second unit switching panel 84, the third solar power generation device 91 and the third unit switching panel 94, the fourth solar power generation device 101 and the fourth The unit switching panel 104 has substantially the same configuration as each other. Accordingly, hereinafter, the second solar power generation device 81 and the second unit switching panel 84 will be described, and the third solar power generation device 91 and the third unit switching panel 94 will be described. 11 and the fourth unit switching panel 104 are denoted by reference numerals in FIG. 11 and the description thereof is omitted.

  The second solar power generation device 81 is a device that generates power using sunlight. The second solar power generation device 81 includes a solar cell panel and the like. The second solar power generation device 81 is connected to the second inverter 83 in the second unit 80 via the distribution line L4a.

  The second unit switching panel 84 controls the input of the power (DC power) generated by the second solar power generation device 81 to the second power conditioner 83. The second unit switch 85 of the second unit switching panel 84 can turn on / off (permit or prohibit) the flow of electric power at the location where it is arranged. The second unit switch 85 is disposed in the second unit switching panel 84 at a midpoint of the distribution line L4a. The second unit switch 85 is turned on when a predetermined on condition is satisfied, and permits the flow of electric power at the location. The second unit switch 85 is turned off when a predetermined off condition is satisfied, and prohibits the flow of electric power at the location where the second unit switch 85 is arranged.

  The ON condition of the second unit switch 85 is that the normal condition, or that the power (the power from the first unit 30) by the independent operation of the first inverter 33 is not output at the time of the power failure. Either. Further, the off condition of the second unit switch 85 is that the power (the power from the first unit 30) by the independent operation of the first inverter 33 is output at the time of the power failure. The ON / OFF control of the second unit switch 85 (determination of whether the second unit switch 85 satisfies the ON condition or the OFF condition) is performed by the first inverter 33 of the first unit 30. .

  Hereinafter, a power supply mode of the power supply system 300 according to the third embodiment in a normal state will be described with reference to FIG.

  In the normal state, the second unit switch 85 is turned on when the ON condition is satisfied, and the flow of power is permitted. In such a case, as shown in FIG. 12A, the electric power generated by the second solar power generation device 81 is input to the second inverter 83 via the distribution line L4a. The electric power input to the second inverter 83 is input (charged) to the second power storage device 82 by the second inverter 83 or output via the distribution line L4. If the power output by the second inverter 83 via the distribution line L4 has a surplus with respect to the power consumption of the load, the surplus power is transferred to the commercial power source 3 via the distribution line L1. Power can be sold with reverse power flow. In this way, when the power output from the second unit 80 is sold, economic benefits can be obtained.

  Hereinafter, the power supply mode of the power supply system 300 according to the third embodiment when the power is output from the first unit in the self-sustaining operation at the time of a power outage will be described with reference to FIG. explain.

  In such a case, the second unit switch 85 satisfies the off condition and is turned off, and the flow of power is prohibited. Thus, as shown in FIG. 12B, even when power is being generated by the second solar power generation device 81, the generated power is supplied to the second power conditioner via the distribution line L4a. 83 is not input.

  Here, when power is being output from the first unit in the self-sustaining operation during a power outage, the power generated by the second solar power generation device 81 is output, and the commercial power is supplied via the distribution line L1. 3, there is a possibility that the power flowing backward may be supplied to the transformer 40 via the distribution lines L1 and L3. As described above, when the reverse flow power is supplied to the transformer 40, a problem may occur in the transformer 40.

  However, in the power supply system 300, when power is being output from the first unit in the self-sustaining operation during a power outage, the second unit switch 85 satisfies the off condition and is turned off. The power generated by the second solar power generation device 81 does not flow backward to the commercial power supply 3 via the distribution line L1. That is, since the reverse flow power is not supplied to the transformer 40 via the distribution lines L1 and L3, it is possible to prevent the transformer 40 from causing a problem.

  Hereinafter, a power supply system 400 according to the fourth embodiment will be described with reference to FIG.

  Note that, in the power supply system 400 according to the fourth embodiment, compared to the power supply system 1 according to the first embodiment, loads other than the load 2 (the load 121, the load 122, and the load 123) (more specifically, The configuration is different in that the resistance loads 411 and 412, the shared load 431, and the shared important load 432) are provided.

  The resistance loads 411 and 412 shown in FIG. 13 correspond to a case where the pseudo interconnection operation of the second inverter 83, the third inverter 93, and the fourth inverter 103 is started at the time of a power failure, and the second inverter 83 When the power output from the third inverter 93 and the fourth inverter 103 flows backward for some reason, it is a load for consuming the reversely flowing power. The resistance loads 411 and 412 are connected to the distribution board 10 via the distribution line L10. More specifically, the resistance loads 411 and 412 are connected to an intermediate part of the distribution line L1 (between the fourth switch 70 and the second sensor 22) in the distribution board 10. The fifth switch 421 is disposed on the distribution line L10.

  The fifth switch 421 is for turning on / off (permitting or prohibiting) the flow of electric power at the location. The fifth switch 421 is turned on when a predetermined on condition is satisfied, and permits the flow of electric power at the location where the fifth switch 421 is arranged. Further, the fifth switch 421 is turned off when a predetermined off condition is satisfied, and prohibits the flow of electric power at the location where the fifth switch 421 is disposed.

  The ON condition of the fifth switch 421 is that a power failure occurs. Further, the off condition of the fifth switch 421 is that it is a normal time. The ON / OFF control of the fifth switch 421 (determination of whether the fifth switch 421 satisfies the ON condition or the OFF condition) is performed by the first inverter 33 of the first unit 30.

  A shared load 431 and a shared important load 432 shown in FIG. 13 are loads provided in a common part of a factory. In addition, the shared load 431 is a load provided in the shared part of the factory, which has a relatively small necessity to continue supplying power during a power outage. The shared important load 432 is a load among the loads provided in the common part of the factory, in which it is relatively necessary to continuously supply power even during a power outage.

  The shared load 431 is arranged in the middle of the distribution line L11. The distribution line L11 is a distribution line connected to the distribution line L1 so as to bypass the first switching panel 50 and the first unit 30. One end of the distribution line L11 is connected to an upstream side of the distribution line L1 in the distribution board 10 from a connection portion of the distribution lines L2 and L1. The other end of the distribution line L11 is connected between the first switchboard 50 and the third switch 60 of the distribution line L1 in the distribution board 10. In the distribution line L11, a sixth switch 422, a seventh switch 423, and an eighth switch 424 are arranged.

  The sixth switch 422 is disposed in the distribution board 10 in the middle of the distribution line L11. The sixth switch 422 is for turning on / off (permitting or prohibiting) the flow of electric power at the location. The sixth switch 422 is turned on when a predetermined on condition is satisfied, and permits the flow of electric power at the location where the sixth switch 422 is arranged. The sixth switch 422 is turned off when a predetermined off condition is satisfied, and prohibits the flow of electric power at the location where the sixth switch 422 is arranged.

  The ON condition of the sixth switch 422 is that a power failure occurs. The off condition of the sixth switch 422 is that it is in a normal state. The ON / OFF control of the sixth switch 422 (determination whether the sixth switch 422 satisfies the ON condition or the OFF condition) is performed by the first inverter 33 of the first unit 30.

  The seventh switch 423 is arranged between the shared load 431 and the sixth switch 422 on the distribution line L11. The seventh switch 423 is for turning on / off (permitting or prohibiting) the flow of electric power at the location. The seventh switch 423 is turned on when a predetermined on condition is satisfied, and permits the flow of electric power at the location where the switch is arranged. Further, the seventh switch 423 is turned off when a predetermined off condition is satisfied, and prohibits the flow of power at the location where the seventh switch 423 is disposed.

  The ON condition of the seventh switch 423 is that it is normal. In addition, the off condition of the seventh switch 423 is that a power failure occurs.

  The eighth switch 424 is arranged between the seventh switch 423 and the sixth switch 422 on the distribution line L11. The eighth switch 424 is for turning on / off (permitting or prohibiting) the flow of electric power at the location. The eighth switch 424 is turned on when a predetermined on condition is satisfied, and permits the flow of power at the location where the switch is arranged. Further, the eighth switch 424 is turned off when a predetermined off condition is satisfied, and prohibits the flow of electric power at the location where the switch is arranged.

  The ON condition of the eighth switch 424 is that a power failure occurs. In addition, the off condition of the eighth switch 424 is that it is a normal time.

  As described above, the ON / OFF states of the seventh switch 423 and the eighth switch 424 are set so as to be mutually exclusive. Specifically, when the seventh switch 423 is turned on, the eighth switch 424 is turned off. When the seventh switch 423 is turned off, the eighth switch 424 is turned on. The on / off control of the seventh switch 423 and the eighth switch 424 (determination of whether the seventh switch 423 and the eighth switch 424 satisfy the on condition or the off condition) is performed by the first unit. The operation is performed by the first power conditioner 33.

  The shared important load 432 is connected to the downstream end of the distribution line L12. The upstream end of the distribution line L12 is connected to a middle part of the distribution line L11 (between the seventh switch 423 and the eighth switch 424).

  Hereinafter, the power supply mode of the power supply system 400 according to the fourth embodiment in a normal state will be described with reference to FIG.

  In a normal state, the fifth switch 421 satisfies the off condition and is turned off, and the flow of power is prohibited. Further, the sixth switch 422 satisfies the off condition and is turned off, and the flow of power is prohibited. When the seventh switch 423 is turned on and the eighth switch 424 is turned off, the power distribution of the seventh switch 423 is permitted and the power distribution of the eighth switch 424 is prohibited. I have.

  In such a case, the electric power from the commercial power supply 3 flowing through the distribution line L1 (or the electric power output from the first unit 30) flows to the distribution line L11 and is transmitted to the shared load 431 and the shared important load 432. Supplied.

  Hereinafter, a power supply mode of the power supply system 400 according to the fourth embodiment during a power outage will be described with reference to FIGS. 15 to 17.

  In the case of a power outage, the fifth switch 421 satisfies the on condition and is turned on, and the flow of power is permitted. Further, the sixth switch 422 satisfies the ON condition and is turned ON, and the flow of power is permitted. Further, when the seventh switch 423 is turned off and the eighth switch 424 is turned on, the power distribution of the seventh switch 423 is prohibited and the power distribution of the eighth switch 424 is permitted. I have.

  In such a case, the electric power from the first unit 30 in the self-sustaining operation flowing through the distribution line L1 flows to the distribution line L11 and is supplied to the shared important load 432.

  As described above, in the power supply system 400 according to the fourth embodiment, during normal times, power is supplied to all loads (the shared load 431 and the shared important load 432) provided in the common part of the factory. . However, in the case of a power outage, power is supplied only to the shared important load 432 among all loads provided in the common part of the factory. In other words, by limiting the load that supplies power at the time of a power failure, it is possible to avoid as much as possible the inconvenience that power is not supplied to the shared important load 432 that has a relatively large need to continue supplying power even during a power failure. can do.

  In addition, after the output of the power from the first inverter 33 by the self-sustaining operation is started, if the output of the electric power from the first inverter 33 stops for some reason, the first operation by the independent operation as described above. Even when the output of the power from the power controller 33 is started again, the power output from the first power controller 33 does not flow through the third switch 60 (the distribution line L1) (the first embodiment). FIG. 6 of the power supply system 1 according to the embodiment).

  In such a case, as shown in FIG. 16, the power output from the first inverter 33 by the self-sustaining operation does not flow through the third switch 60 (distribution line L1), but flows to the distribution line L11. The shared important load 432 is supplied. That is, by continuing to turn off the third switch 60, the second inverter 83, the third inverter 93, and the fourth inverter 103 are prevented from becoming complicated operations, and even when a power failure occurs, Power can be supplied to the shared important load 432 where the necessity of continuing the supply of power is relatively high.

  In addition, at the time of a power failure, for example, when the power consumption of the load 2 becomes momentarily small after the pseudo interconnection operation of the second inverter 83, the third inverter 93, and the fourth inverter 103 is started. In addition, the power output from the second inverter 83, the third inverter 93, and the fourth inverter 103 due to the pseudo interconnection operation may flow backward in the distribution line L1 toward the commercial power supply 3 ( See FIG. 17). As described above, when the power output from the second inverter 83, the third inverter 93, and the fourth inverter 103 flows in the reverse flow due to the pseudo interconnection operation, the output from the first inverter 33 in the self-sustaining operation may stop. In some cases, a malfunction may occur in the transformer 40.

  However, as shown in FIG. 17, in the case of a power outage, the fifth switch 421 satisfies the on condition and is turned on, and the flow of power is permitted. Therefore, the power flowing backward is transmitted via the distribution line L10. Therefore, it is supplied to the resistance loads 411 and 412. That is, even when the power output from the second inverter 83, the third inverter 93, and the fourth inverter 103 flows in reverse flow, the output from the first inverter 33 in the independent operation is stopped, For example, it is possible to prevent a problem from occurring in the forty.

As described above, the power supply system 1 according to the first embodiment includes:
A distribution board 10 capable of supplying electric power from the commercial power supply 3 to the load 2,
A first solar power generation device 31 capable of generating power using natural energy, a first power storage device 32 capable of charging and discharging power from the first solar power generation device 31 and the commercial power source 3, and A first inverter 33 for controlling the charging and discharging of one power storage device 32; an interconnection operation for supplying electric power to the distribution board 10 in connection with the commercial power supply 3; A first unit 30 capable of performing a self-sustaining operation of supplying power to the distribution board 10 by
A first switching panel 50 that switches a supply source of the power supplied to the load 2 to the commercial power supply 3 or the first unit 30;
A transformer 40 that boosts a voltage of electric power supplied from the first unit 30 to the distribution board 10 during the self-sustaining operation;
Second, third, and fourth power storage devices 82, 92, 102 capable of charging and discharging power from the commercial power source 3, and charging and discharging of the second, third, and fourth power storage devices 82, 92, 102 And second and third / fourth inverters 83, 93 and 103 for controlling the power supply, and are arranged closer to the load 2 than the first switchboard 50 and supply the power to the distribution board 10 A third / fourth unit 80/90/100;
A first power conditioner 33 (power failure detection unit) capable of detecting a power failure of the commercial power supply 3,
The first switchboard 50 and the second, third, and fourth units are disposed between the first switchboard 50 and the second, third, and fourth units 80, 90, and 100. A closed state permitting the flow of power between the first, second, third, and fourth units 80, 90, and 100; A third / fourth switch 60/70 (first opening / closing unit) for switching between an open state and a forbidden state,
When a power failure is detected by the first power conditioner 33 (power failure detection unit) and a predetermined condition is satisfied, the third and fourth switches 60 and 70 (first opening / closing unit) are opened. A first inverter 33 (control unit) for switching;
Is provided.

  With such a configuration, the electric power circulated through the transformer 40 at the time of the power outage is transferred to the second, third, and fourth units 80, 90, 100 on the downstream side (load 2 side). Of the power storage devices 82, 92, and 102 can be prevented from being charged.

In the power supply system 1 according to the first embodiment,
The second, third, and fourth power storage devices 82, 92, and 102 of the second, third, and fourth units 80, 90, and 100 perform charging in a predetermined charging time zone (within a charging period). Set to get
The first inverter 33 (control unit)
When a power failure is detected by the first power conditioner 33 (power failure detection unit) and the predetermined charging condition is satisfied and the predetermined charging time period (within the charging period) is satisfied, the third and fourth power conditioners are detected. The fourth switch 70 (first opening / closing unit) of the switches 60 and 70 is switched to the open state.

  With such a configuration, the electric power circulated through the transformer 40 at the time of a power failure can be transferred to the second, third, and fourth units 80, 90, and 100 on the downstream side (load 2 side) by simple control according to the period. The second, third, and fourth power storage devices 82, 92, and 102 can be prevented from being charged.

In the power supply system 1 according to the first embodiment,
The first inverter 33 (control unit)
A power outage is detected by the first power conditioner 33 (power outage detection unit), and the power distribution panel 10 via the transformer 40 from the first unit 30 during the self-sustaining operation as a case where the predetermined condition is satisfied. When the supply of power to the power supply is stopped, the third switch 60 (first opening / closing unit) of the third and fourth switches 60 and 70 is switched to the open state, and the open state is stopped. It will be maintained until it is resolved.

  With such a configuration, the electric power circulated through the transformer 40 at the time of the power outage is transferred to the second, third, and fourth units 80, 90, 100 on the downstream side (load 2 side). Power storage devices 82, 92, and 102 can be prevented from being charged, and the second, third, and fourth units 80, 90, and 100 can be prevented from performing complicated operations.

In the power supply system 200 according to the second embodiment,
The load 2 (load 121) includes a general load 121a, a first important load 121b, and a second important load 121c (a plurality of specific loads) which are set according to the magnitude of the need to maintain power supply. ,
A second switching panel 111 that switches a power supply destination to one of the general load 121a, the first important load 121b, and the second important load 121c (a plurality of specific loads);
The second unit 80 is connected to the commercial power supply 3 or the first unit 30 to supply power to the distribution board 10 (normal connection operation and pseudo connection operation); Independent operation of supplying power to the distribution board 10 independently of the commercial power supply 3 and the first unit 30;
The first inverter 33 (control unit)
According to the operation state of the second unit 80, the destination of the power supply from the second unit 80 is changed by the second switching panel 111 to the general load 121a, the first important load 121b, and the second important load 121b. The load is switched to one of the loads 121c (a plurality of specific loads).

  With such a configuration, depending on the operation state of the second unit 80, any one of the general load 121a and the first general load 121a set as a power supply destination according to the magnitude of the need to maintain the power supply is set. The important load 121b and the second important load 121c can be selected.

In the power supply system 300 according to the third embodiment,
The second, third, and fourth units 80, 90, and 100 include second, third, and fourth solar power generation devices 81, 91, and 101 that can generate power using natural energy. The open state in which the output of the electric power generated by the third and fourth solar power generation devices 81, 91 and 101 is prohibited, and the power is generated by the second, third and fourth solar power generation devices 81, 91 and 101. Further comprising second, third, and fourth unit switching panels 84, 94, and 104 for switching between a closed state and an output state of the output power.
The first inverter 33 (control unit)
When a power failure is detected by the first power conditioner 33 (power failure detection unit), the second, third, and fourth unit switching boards 84, 94, and 104 are switched to an open state.

  With such a configuration, it is possible to prevent the power generated by the second, third, and fourth photovoltaic power generators 81, 91, 101 from flowing backward to the commercial power supply 3 during a power outage.

In the power supply system 400 according to the fourth embodiment,
A fifth switch 421 is connected between the third / fourth switch 60/70 (first opening / closing unit) and the second / third / fourth unit 80/90/100. Further comprising resistance loads 411 and 412,
The fifth switch 421 is in a closed state that permits the flow of power from the second, third, and fourth units 80, 90, 100 to the resistive loads 411, 412, and the second, third, and fourth units. An open state in which the flow of power from the fourth unit 80, 90, 100 to the resistance load 411, 412 is prohibited,
The first inverter 33 (control unit)
When a power failure is detected by the first power conditioner 33 (power failure detection unit), the fifth switch 421 is switched to a closed state.

  With such a configuration, even when the power output from the second, third, and fourth units 80, 90, and 100 flows backward to the commercial power supply 3 during a power outage, the power that has flowed backward is Supply to the first unit 30 can be prevented.

Note that the first unit 30 according to the present embodiment is an embodiment of the first unit according to the present invention.
The second, third, and fourth units 80, 90, and 100 according to the present embodiment are one embodiment of the second unit according to the present invention.
The second, third, and fourth power storage devices 82, 92, and 102 according to the present embodiment are one embodiment of the second power storage device according to the present invention.
The second, third, and fourth solar power generation devices 81, 91, and 101 according to the present embodiment are one embodiment of the second power generation device according to the present invention.
The third and fourth switches 60 and 70 according to the present embodiment are one embodiment of the first opening / closing unit according to the present invention.
The second, third, and fourth unit switching boards 84, 94, and 104 according to the present embodiment are one embodiment of the second opening and closing unit according to the present invention.
The fifth switch 421 according to the present embodiment is an embodiment of the third opening / closing unit according to the present invention.

  Although the first embodiment of the present invention has been described above, the present invention is not limited to the above configuration, and various modifications can be made within the scope of the invention described in the claims.

  For example, the application targets of the power supply systems 1, 200, 300, and 400 are not limited to factories as in the present embodiment. That is, the power supply systems 1, 200, 300, and 400 can be applied to places other than the factory. Specifically, the present invention can be applied to business establishments, apartment houses, and the like.

  The first, second, third, and fourth solar power generation devices 31, 81, 91, and 101 according to the present embodiment use sunlight as natural energy. Force or the like may be used.

  In addition, the first switching panel 50 and the second switching panel 110 according to the present embodiment are controlled by the first power control 33 of the first unit 30, but are controlled by other control units (devices). You may.

  The second, third, and fourth units 80, 90, and 100 according to the present embodiment (that is, units other than the first unit 30 disposed on the most upstream side (the side of the commercial power supply 3)) are 3 units. There is no need to use one, and two or four or more may be used.

DESCRIPTION OF SYMBOLS 1 Power supply system 2 Load 3 Commercial power supply 10 Distribution board 30 First unit 31 First solar power generation device 32 First power storage device 33 First power conditioner 40 Transformer 50 First switching panel 60 Third switch Reference Signs List 70 fourth switch 80 second unit 82 second power storage device 83 second power control 90 third unit 92 third power storage device 93 third power control 100 fourth unit 102 fourth power storage device 103 Four power controllers

Claims (6)

A distribution board capable of supplying power from a commercial power supply to the load,
A first power generation device capable of generating power using natural energy, a first power storage device capable of charging and discharging power from the first power generation device and the commercial power supply, and charging and discharging the first power storage device. An interconnection operation including a first power conditioner to be controlled and interconnecting with the commercial power supply to supply power to the distribution board, and an independent operation supplying power to the distribution board independently of the commercial power supply And a first unit capable of performing
A first switching panel that switches a supply source of the power supplied to the load to the commercial power supply or the first unit,
A transformer that boosts the voltage of power supplied to the distribution board from the first unit during the self-sustaining operation,
A second power storage device capable of charging and discharging power from the commercial power supply, and including a second power conditioner for controlling the charging and discharging of the second power storage device, closer to the load side than the first switching panel A second unit arranged to supply power to the distribution board;
A power failure detection unit capable of detecting a power failure of the commercial power supply,
A closed state that is disposed between the first switching panel and the second unit and that allows power to flow between the first switching panel and the second unit; A first opening / closing unit that switches between an open state that prohibits the flow of power between the panel and the second unit,
A power failure is detected by the power failure detection unit, and a control unit that switches the first opening / closing unit to an open state when a predetermined condition is satisfied,
A power supply system comprising: The second power storage device of the second unit is set to be able to charge within a predetermined charging period,
The control unit includes:
A power failure is detected by the power failure detection unit, and when the predetermined condition is satisfied and within the predetermined charging period, the first switching unit is switched to an open state.
The power supply system according to claim 1. The control unit includes:
When the power failure is detected by the power failure detection unit, and when the predetermined condition is satisfied, the power supply from the first unit to the distribution board via the transformer is stopped during the self-sustaining operation. Switching the first opening and closing unit to an open state, and maintaining the open state until the power outage is resolved;
The power supply system according to claim 1. The load includes a plurality of specific loads set according to the magnitude of the need to maintain power supply,
Further comprising a second switching panel for switching the power supply destination to any of the plurality of specific loads,
The second unit is connected to the commercial power supply or the first unit to supply power to the distribution board, and the second unit is independent of the commercial power supply and the first unit. And independent operation of supplying power to the power board.
The control unit includes:
According to the operation state of the second unit, the power supply destination from the second unit is switched to any one of the plurality of specific loads by the second switching panel,
The power supply system according to claim 1. The second unit is a second power generation device capable of generating power using natural energy, an open state in which output of power generated by the second power generation device is prohibited, and power generation is performed by the second power generation device. Further comprising a second opening and closing unit for switching between a closed state to allow the output of the power,
The control unit includes:
When a power failure is detected by the power failure detection unit, the second switching unit is switched to an open state,
The power supply system according to claim 1. Further comprising a resistive load connected via a third switching unit between the first switching unit and the second unit,
The third opening / closing unit switches between a closed state in which the flow of power from the second unit to the resistance load is permitted and an open state in which the flow of power from the second unit to the resistance load is prohibited. Is configured to
The control unit includes:
When a power failure is detected by the power failure detection unit, the third switching unit is switched to a closed state,
The power supply system according to claim 1.

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