JP2014180125A - Photovoltaic power generation system and auxiliary electrical power system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify connection with a commercial power supply network compared with the traditional system by effectively avoiding an inverse load flow to the commercial power supply network at the time of a power failure, etc.SOLUTION: The photovoltaic power generation system includes: a solar panel 15 for outputting electric power from sunlight; a change-over switch 13 for selectively outputting electric power from a commercial power source (3) or the electric power from the solar panel 15; an auxiliary power unit 14 which recharges a battery with electric power output by the change-over switch 13 and outputs the electric power stored in the battery; control relays 11C, 11D on a load side which selectively output the electric power from the auxiliary power unit 14 or electric power from the commercial power source (3) to loads 9C, 9D; a control relay 12 on a change-over switch side which blocks input of the electric power from the commercial power source (3) to the change-over switch 13; and a controller 17 for controlling an overall operation. At the time of failure of the commercial power source (3), through control of the controller 17, the battery is recharged with the electric power from the solar panel 15 and the loads 9C, 9D are driven with the electric power stored in the battery with connection between a power supply network of the commercial power source (3) and the change-over switch 13 being blocked by the control relay 12 on the change-over switch side.

Description

  The present invention relates to a solar power generation system and an auxiliary power supply system, for example, a solar power generation system using an auxiliary power supply device using a battery in an ordinary house, an auxiliary power supply system applicable to solar power generation, and the like.

  2. Description of the Related Art Conventionally, a solar power generation system used in general homes and the like is configured to be able to use a commercial power source in combination, and thereby configured to compensate for power shortage by solar power generation with the commercial power source. Japanese Patent Application Laid-Open No. 2011-130655 proposes a method of effectively using a battery by charging electric power generated by solar power generation with an auxiliary power system. Further, in this type of solar power generation system, various ideas for sending surplus power to a power network of a commercial power source by so-called grid cooperation have been proposed.

  In addition, in a power generation facility (called a local power generation facility) installed in a house, such as a solar panel, there are various types of facilities that generate power using fossil fuels such as gas and oil, and facilities that generate power using wind power. Even in such a local power generation facility, combined use with a commercial power supply and use of an auxiliary power supply system are attempted.

JP 2011-130655 A

  By the way, in a photovoltaic power generation system in which a commercial power source can be used in combination and the battery can be charged by an auxiliary power system, the power of the battery of the auxiliary power system can be used instead of the commercial power source. Electricity such as lighting can be ensured even during a power failure, and convenience can be improved. However, when the battery power is used in place of the commercial power supply, it is necessary to provide a configuration that prevents reverse power flow to the commercial power supply network and further links the power supply in the auxiliary power supply system.

  For these reasons, conventionally, in this type of solar power generation system, and also in an auxiliary power supply system used for a solar power generation system or the like, there is a problem that the configuration of the auxiliary power supply system becomes complicated with respect to connection with a commercial power supply network.

  The present invention has been made in consideration of such problems, and effectively avoids a reverse power flow to the commercial power network during a power outage or the like, thereby simplifying the connection with the commercial power network compared to the prior art. The purpose is to propose a photovoltaic power generation system and an auxiliary power supply system that can be converted into a power generation system.

  In order to achieve the above object, the present invention comprises the following configuration.

(1) a solar panel that outputs solar power,
A selector switch for selectively outputting the power of a commercial power source or the power of the solar panel;
An auxiliary power supply device that charges the battery with the power output from the changeover switch and outputs the power charged in the battery;
A load-side control relay that selectively outputs power from the auxiliary power supply or commercial power to a load;
A control relay on the changeover switch side that cuts off the input of electric power of the commercial power supply to the changeover switch;
And a controller that controls the overall operation,
During a power failure of the commercial power supply,
Under the control of the controller, the battery is charged by the power of the solar panel while the connection between the commercial power supply network and the changeover switch is cut off by the control relay on the changeover switch side, and the battery is charged. The load is driven by the generated electric power.

  According to (1), the control relay on the load side and the control relay on the changeover switch side separate from the commercial power supply network at the time of a power failure of the commercial power supply, so that no system linkage configuration is required, and the solar panel power And the load can be driven by this electric power, and the reverse power flow can be prevented with a simple configuration.

(2) In (1), when the commercial power supply is not interrupted,
With a commercial power source at night, a control relay on the side of the selector switch, the commercial power source is supplied to the auxiliary power device via the selector switch, and the battery is charged by the commercial power source,
At least in the daytime, the load is driven by the power charged in the battery, and the power of the solar panel is cut off in a state where the connection between the power supply network of the commercial power source and the changeover switch is cut off by the control relay on the changeover switch side. Is output to the power network of the commercial power source.

  According to (2), the battery is charged with the nighttime power of the commercial power source, and the load is driven by the charged power so that the load is driven effectively by using the charged power. In this case, it is possible to effectively avoid the reverse power flow to the commercial power network, and further eliminate the need for a configuration of awareness and linkage.

(3) a changeover switch for selectively outputting the power of commercial power or the power of local power supply equipment;
An auxiliary power supply device that charges the battery with the power output from the changeover switch and outputs the power charged in the battery;
A load-side control relay that selectively outputs power from the auxiliary power supply or commercial power to a load;
A control relay on the changeover switch side that cuts off the input of electric power of the commercial power supply to the changeover switch;
And a controller that controls the overall operation,
During a power failure of the commercial power supply,
Under the control of the controller, the battery is charged by the power of the local power supply facility in a state where the connection between the power supply network of the commercial power supply and the changeover switch is cut off by the control relay on the changeover switch side, and the battery is charged. The load is driven by the generated electric power.

  According to (3), the control relay on the load side and the control relay on the changeover switch side separate from the commercial power supply network at the time of a power failure of the commercial power supply and eliminate the need for a system linkage configuration. And the load can be driven by this electric power, and the reverse power flow can be prevented with a simple configuration.

(4) In (3),
When the commercial power supply is not interrupted,
With a commercial power source at night, a control relay on the side of the selector switch, the commercial power source is supplied to the auxiliary power device via the selector switch, and the battery is charged by the commercial power source,
At least during the daytime, the load is driven by the electric power charged in the battery, and the electric power of the local power supply equipment is in a state where the connection between the power supply network of the commercial power supply and the changeover switch is cut off by the control relay on the changeover switch side. Is output to the power network of the commercial power source.

  According to (4), the battery is charged with the nighttime power of the commercial power supply, and the load is driven by the charged power so that the load is driven effectively by using the charged power. In this case, it is possible to effectively avoid the reverse power flow to the commercial power network, and further eliminate the need for a configuration of awareness and linkage.

  ADVANTAGE OF THE INVENTION According to this invention, the reverse power flow to the commercial power network at the time of a power failure can be avoided effectively, and the connection with a commercial power network can be simplified compared with the past.

It is a perspective view which shows the solar energy power generation system in one Embodiment of this invention. It is a figure which shows the connection in the case of using the commercial power source of the solar energy power generation system of FIG. It is a figure which shows the connection in the case of charging a battery with a commercial power source in the photovoltaic power generation system of FIG. It is a figure which shows the connection in the case of selling electricity in the solar energy power generation system of FIG. It is a figure which shows the case where a load is driven with the electric power of a battery in the photovoltaic power generation system of FIG. It is a figure where it uses for description of the switching of the connection of FIGS. It is a figure which shows the connection at the time of a power failure of a commercial power source in the photovoltaic power generation system of FIG. It is a figure with which it uses for description of the continuation of FIG.

[First Embodiment]
〔overall structure〕
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a photovoltaic power generation system according to the first embodiment of the present invention. This solar power generation system 1 is installed in a general house or the like, and is connected to a commercial power supply network 3 via a power meter 2 for selling and buying power. The solar power generation system 1 is provided with an auxiliary power supply system H using an auxiliary power supply device 14 using a battery. The auxiliary power supply system H includes an auxiliary power supply device 14, a control distribution board 10, and the control distribution board. 10 (control relays 11C, 11D, safety breakers 18C, 18D, leakage breaker 19, controller 17), control relay 12 and / or changeover switch 13, outlet 20, plug 21, and the like.

  The house according to the solar power generation system 1 is provided with a home distribution board 4 which is a general home distribution board. The home distribution board 4 is provided with a contract breaker 5, an earth leakage breaker 6, and safety breakers 7A to 7E, similar to the distribution board provided when not selling power. The contract breaker 5 is a breaker that cuts off the connection with the commercial power supply network when a current greater than or equal to the contracted current flows in and out, and is connected to the commercial power supply network 3 via the power meter 2.

  The earth leakage breaker 6 is connected to the contract breaker 5 and the interconnection breaker 8 and cuts off the connection between the agreement breaker 5 and the interconnection breaker 8 due to an excessive current due to electric leakage or the like. The safety breakers 7A to 7E are connected to the earth leakage breaker 6, respectively, and are disconnected from the earth leakage breaker 6 due to an excessive current exceeding the set current. In the photovoltaic power generation system 1, safety breakers 7A, 7B, 7C, and 7D are connected to loads 9A, 9B, 9C, and 9D such as various home appliances provided in the home.

  As a result, the photovoltaic power generation system 1 uses the power meter 2, the contract breaker 5, the earth leakage breaker 6, the safety breakers 7A, 7B, 7C, and 7D in sequence to load the power 9A, 9B, 9C, Supply to 9D. Of the loads 9A to 9D, the loads 9C and 9D are indoor lighting or the like that is remarkably inconvenient when the commercial power supply fails, and is via control relays 11C and 11D provided on the control distribution board 10 described later. It is connected to the safety breakers 7C and 7D, and thereby configured to be able to separately control connection with the commercial power supply network under the control of the control relays 11C and 11D.

  On the other hand, the safety breaker 7E is connected to the auxiliary power supply device 14 via the control relay 12 and the changeover switch 13, so that the solar power generation system 1 can supply commercial power to the auxiliary power supply device 14. Is done. Here, the auxiliary power supply device 14 is a power supply device whose operation is switched under the control of the controller 17 provided in the control distribution board 10, and accumulates electric power by charging a built-in battery and accumulates by discharging the battery. Output power. Thereby, this solar power generation system 1 is configured to be able to charge the auxiliary power supply device 14 with the power of the commercial power source and to send out the charged power.

  In this solar power generation system 1, the solar panel 15 is installed on, for example, a roof and outputs electric power from sunlight. The power conditioner 16 switches the operation under the control of the controller 17, and when the auxiliary power supply 14 is charged by the power of the solar panel 15, the power output from the solar panel 15 is transferred to the auxiliary power supply 14 via the changeover switch 13. Output. In addition, at the time of power sale, the power conditioner 16 outputs the power output from the solar panel to the contract breaker 5 via the interconnection breaker 8 by system linkage. Therefore, the interconnection breaker 8 is a breaker that cuts off the connection due to an excessive outflow of current from the power conditioner 16. Note that the power conditioner 16 stops operation of the grid connection in the self-sustaining power generation mode by operating a switch provided in the casing of the power conditioner 16 and controlling the controller 17 and supplies power at a voltage and frequency equivalent to the commercial power supply. Output to the changeover switch 13.

  The changeover switch 13 switches contacts under the control of the controller 17, and outputs power output from the control relay 12 to the auxiliary power supply device 14 when charging with the commercial power supply of the auxiliary power supply device 14. When charging with the power of the panel 15, the power output from the power conditioner 16 is output to the auxiliary power supply device 14.

  The control relay 12 normally connects the safety breaker 7E and the changeover switch 13, but cuts off this connection under the control of the controller 17 when the commercial power supply is interrupted.

  The distribution board 10 for control is a distribution board installed when installing the solar power generation system 1 in this house, and the control relays 11C and 11D, the safety breakers 18C and 18D, the leakage breaker 19 and the controller 17 are provided. Provided. Here, power is supplied to the leakage breaker 19 from the auxiliary power supply device 14, and the connection is cut off when a current related to the power becomes excessive. The safety breakers 18C and 18D connect the earth leakage breaker 19 to the control relays 11C and 11D, respectively, and cut off the connection due to an excessive current exceeding the preset power. The control relays 11C and 11D switch their operations under the control of the controller 17, respectively, and selectively load the power from the commercial power source output from the safety breakers 7C and 7D and the power from the battery output from the auxiliary power unit 14 to the loads 9C and 9D. Output to.

  In this embodiment, an outlet 20 that outputs power from the changeover switch 13 is provided on the input side of the auxiliary power supply 14, and the auxiliary power supply 14 is connected to the control distribution board 10 via a plug 21. It is comprised so that the electric power from may be input. Thereby, the solar power generation system 1 is configured to replace the plug 21 with the outlet 20 and output the electric power from the power conditioner 16 to the loads 9C and 9D.

  Further, the auxiliary power supply device 14 is provided with a structure for preventing backflow by a diode or the like in the charge / discharge circuit of each battery cell. For example, when charging with the commercial power source, the commercial power source temporarily drops in voltage. The reverse power flow is prevented, and further, when an abnormality occurs in the auxiliary power supply device 14 or the like, this abnormality is expanded, and further, a failure occurs so as not to expand.

[Connection type]
The controller 17 is a computer that controls the operation of the solar power generation system 1. The entire operation is switched according to the user setting related to the photovoltaic power generation system 1.

  FIG. 2 is a diagram showing connections when the loads 9 </ b> A to 9 </ b> D are driven only by a commercial power source under the control of the controller 17. In FIG. 2 and the following, the supply of electric power is indicated by a very thick line. When power is supplied from the commercial power supply network 3 and the controller 17 is set so as to cover household power only by the commercial power supply according to the prior setting, the contacts of the control relays 11C and 11D Is held on the home distribution panel 4 side. Thereby, this solar power generation system 1 supplies electric power from the commercial power supply network 3 to the loads 9A to 9D via the contract breaker 5, the earth leakage breaker 6, the safety breakers 7A to 7D, and the control relays 11C and 11D.

  Further, when the load is driven only by the commercial power source and the battery of the auxiliary power source device 14 is not charged by the commercial power source, the commercial power to the auxiliary power source device 14 is controlled by the control relay 12 and / or the changeover switch 13. In contrast to the power supply stop control, when the battery of the auxiliary power supply 14 is charged by the commercial power supply, the commercial power supplied via the safety breaker 7E is used as shown in FIG. The power is supplied to the auxiliary power supply 14 via the control relay 12 and the changeover switch 13, and the battery of the auxiliary power supply 14 is charged by this power.

  Further, as shown in FIG. 4 in comparison with FIG. 2, when the loads 9 </ b> A to 9 </ b> D are driven by the power of the solar panel 15, the power conditioner 16 is set to operate by system linkage, Electric power is output via the power conditioner 16 and the interconnection breaker 8, and this electric power is supplied to the loads 9A to 9D via the electric leakage breaker 6, the safety breakers 7A to 7D, and the control relays 11C and 11D. Further, when the loads 9 </ b> A to 9 </ b> D are further driven by the power of the solar panel 15 as described above, surplus power is output to the commercial power supply network 3 via the contract breaker 5 and the power meter 2.

  Further, as shown in FIG. 5, when some loads 9C and 9D are driven by electric power charged in the auxiliary power supply device 14 in advance, the control relays 11C and 11D are switched to the auxiliary power supply device 14 side and the auxiliary power supply device 14 is turned on. The operation of the power supply device 14 is switched to send the accumulated power. At this time, the other loads 9 </ b> A and 9 </ b> B are driven by the commercial power supply and the power of the solar panel 15. At this time, the control breaker 12 controls the connection between the safety breaker 7E and the changeover switch 13 to prevent the reverse power flow from the auxiliary power supply 14 to the changeover switch 13 to the trademark power supply. As a result, the auxiliary power supply device 14 can be simplified in configuration because there is no need for system linkage during discharging.

  FIG. 6 is a diagram showing this series of connection switching. In FIG. 6, symbol L1 indicates the amount of power generated by the solar panel 15, and symbol L2 indicates the power consumption in this home. The solar power generation system 1 charges the auxiliary power supply device 14 with nighttime electric power with a low power charge, and in the daytime, morning, and evening when the power charge is high, the power charged in the auxiliary power supply device 14 and sunlight The load is driven by the power of the panel 15, thereby achieving uniform power consumption. In addition, when surplus power is generated in the solar panel 15 during the daytime, the surplus power is sold.

  When a power failure occurs by partially using the power of the commercial power supply in this way, the solar power generation system 1 drives the loads 9C and 9D only by the power of the solar panel 15. 7 and 8 are diagrams showing connections at the time of this power failure. The solar power generation system 1 is configured to detect a power failure of a commercial power source by voltage detection, current detection, or the like in the home distribution board 4, and the controller 17 operates the control relay 12 by detecting the power failure. And the connection between the safety breaker 7E and the changeover switch 13 is cut off. In addition, when the load is set to be driven by the power of the solar panel 15 in advance, or when the power of the solar panel 15 is sufficient, the power conditioner 16 is operated by the independent operation as shown in FIG. The power of the solar panel 15 is output to the auxiliary power supply 14 via the changeover switch 13 to charge the battery, and this power is loaded via the earth leakage breaker 19, safety breakers 18C and 18D, and control relays 11C and 11D. Output to 9C and 9D.

  On the other hand, when the loads 9C and 9D are driven by the power of the solar panel 15 in this way and the power of the solar panel 15 is insufficient, the charging of the battery in the auxiliary power supply device 14 is stopped and controlled. The electric power of the solar panel 15 is used only for driving the loads 9C and 9D.

  On the other hand, when the power of the solar panel 15 is insufficient for driving the loads 9C and 9D, the connection of the changeover switch 13 is switched to connect the power conditioner 16 and the auxiliary power supply device 14 as shown in FIG. Cut off. In this state, the operation of the auxiliary power supply 14 is switched, and the electric power charged in the battery is output to the loads 9C and 9D via the leakage breaker 19, the safety breakers 18C and 18D, and the control relays 11C and 11D. Thereby, the battery of the auxiliary power supply device 14 is charged with the surplus power of the solar panel 15, and the charged power is used for night lighting or the like. In this embodiment, the load at the time of power failure is driven by the power of the solar panel 15 in this way, and in this embodiment, the system that charges the battery of the auxiliary power supply device 14 by the commercial power supply is disconnected by the control of the control relay 12. Thus, reverse power flow to the commercial power supply network can be reliably prevented. Thereby, the reverse power flow to the commercial power supply network at the time of power failure can be effectively avoided, and the connection with the commercial power supply network can be simplified as compared with the conventional case.

  Although the auxiliary power supply 14 is not connected to the commercial power supply except during charging (FIG. 3), the commercial power supply voltage drops, the auxiliary power supply 14 fails, and the commercial power supply is not charged. A reverse power flow to the power supply is also expected to occur. Therefore, in this embodiment, the controller 17 monitors abnormalities in the voltage of the commercial power supply, the terminal voltage of each battery cell in the auxiliary power supply device 14, the charging voltage, and the temperature. When the abnormality is detected, the control relay 12 cuts off the connection to the commercial power source, thereby preventing the occurrence and expansion of the abnormality in each part. When the loads 9C and 9D are being driven, the control relays 11C and 11D cut off the connection with the loads 9C and 9D by detecting abnormalities, thereby protecting the loads 9C and 9D and expanding abnormalities. To prevent.

[Connection Settings]
The controller 17 displays various types of information on the mobile terminal by wireless communication with the mobile terminal provided with the touch panel, thereby notifying the user of the current state of the photovoltaic power generation system 1, the amount of power sold, and the like. Further, the controller 17 displays a setting screen by operating the touch panel in the portable terminal, and accepts various settings through the setting screen.

  More specifically, the time zone (FIG. 2) for driving the loads 9A to 9D with only the commercial power source (FIG. 2), the time zone for charging the battery of the auxiliary power supply device 14 with the commercial power source (FIG. 3), and the power of the solar panel 15 The setting of the time slot | zone (FIG. 5) driven by the electric power of the auxiliary | assistant power supply apparatus 14 is received about the time slot | zone (FIG. 4) and the load 9C of the loads 9A-9D. When the load is driven by the power of the auxiliary power supply device, the time zone and the presence / absence of driving are received for each of the loads 9C and 9D. When the battery is charged and used in this way, a charge amount setting based on the full charge amount is accepted.

  Furthermore, the controller 17 similarly receives a selection setting of a load (9C or 9D) driven by the solar panel 15 and the auxiliary power supply device 14 at the time of a power failure. The controller 17 controls the operation of each part in accordance with the conditions set in this way, and switches the entire connection as described above with reference to FIGS.

  According to the above configuration, in the configuration in which the load is driven by directly charging the battery of the auxiliary power supply device with the commercial power source, the load-side control relays 11C and 11D and the changeover switch 13 side are provided at the time of the commercial power failure. By cutting off the connection between the commercial power supply network and the auxiliary power supply device by the control relay 12, the reverse power flow to the commercial power supply network at the time of power failure can be effectively avoided, and the connection with the commercial power supply network can be made as compared with the conventional case. It can be simplified.

  Further, when the commercial power supply is not interrupted, the battery of the auxiliary power supply device is charged by the commercial power supply at night, and the load is driven by the electric power charged in the battery during the daytime. By cutting off the connection between the commercial power supply network and the changeover switch 13, reverse power flow can be effectively avoided even when the auxiliary power supply device is charged and used by nighttime power. In addition, the auxiliary power supply device 14 is cut off from the commercial power grid when the battery is discharged, both during a power failure and when there is no power failure, so that the auxiliary power supply device 14 is not provided with a configuration relating to grid connection. The configuration can be simplified accordingly. More specifically, in the auxiliary power supply device 14, it is not necessary to provide a system linkage configuration that is a configuration related to connection with a commercial power supply, and thus the configuration can be simplified.

  In addition, by preventing reverse power flow at the time of a power failure in this way, it is possible to prevent an accident related to each device connected to the commercial power supply network at the time of a power failure, etc. It can contribute to the stabilization of the electric power supply of the area concerning the solar power generation system 1.

Other Embodiment
The specific configuration suitable for the implementation of the present invention has been described in detail above. However, the present invention can be variously modified from the configuration of the above-described embodiment without departing from the spirit of the present invention, and further the conventional configuration. Can be combined.

  That is, in the above-described embodiment, the case where only a part of the load is driven by the power charged in the battery has been described. However, the present invention is not limited to this and can be widely applied to the case where all the loads are driven. .

  In the above-described embodiment, the case where the present invention is applied to a solar power generation system that uses power from a solar panel and a commercial power source has been described. However, the present invention is not limited to this, and a power generation mechanism using gas, wind power, or the like. It can apply widely also to the photovoltaic power generation system further equipped with.

  The present invention is not limited to this, and can be widely applied to an auxiliary power system related to a local power generation facility that generates power using fossil fuels such as gas and oil, and a local power generation facility that generates power using wind power, instead of a solar panel.

DESCRIPTION OF SYMBOLS 1 Photovoltaic power generation system 2 Electric power meter 3 Commercial power network 4 Household distribution board 5 Contract breaker 6, 19 Earth leakage breaker 7A-7E, 18C, 18D Safety breaker 8 Interconnection breaker 9A-9D Load 10 Control distribution board 11C, 11D, 12 Control relay 13 Changeover switch 14 Auxiliary power unit 15 Solar panel 16 Power conditioner 17 Controller 20 Outlet 21 Plug

Claims (4)

A solar panel that outputs solar power,
A selector switch for selectively outputting the power of a commercial power source or the power of the solar panel;
An auxiliary power supply device that charges the battery with the power output from the changeover switch and outputs the power charged in the battery;
A load-side control relay that selectively outputs power from the auxiliary power supply or commercial power to a load;
A control relay on the changeover switch side that cuts off the input of electric power of the commercial power supply to the changeover switch;
And a controller that controls the overall operation,
During a power failure of the commercial power supply,
Under the control of the controller, the battery is charged by the power of the solar panel while the connection between the commercial power supply network and the changeover switch is cut off by the control relay on the changeover switch side, and the battery is charged. A photovoltaic power generation system that drives the load with the generated power. When the commercial power supply is not interrupted,
With a commercial power source at night, a control relay on the side of the selector switch, the commercial power source is supplied to the auxiliary power device via the selector switch, and the battery is charged by the commercial power source,
At least in the daytime, the load is driven by the power charged in the battery, and the power of the solar panel is cut off in a state where the connection between the power supply network of the commercial power source and the changeover switch is cut off by the control relay on the changeover switch side. The solar power generation system according to claim 1, wherein the power is output to a power network of the commercial power source. A selector switch for selectively outputting the power of commercial power or the power of local power supply equipment;
An auxiliary power supply device that charges the battery with the power output from the changeover switch and outputs the power charged in the battery;
A load-side control relay that selectively outputs power from the auxiliary power supply or commercial power to a load;
A control relay on the changeover switch side that cuts off the input of electric power of the commercial power supply to the changeover switch;
And a controller that controls the overall operation,
During a power failure of the commercial power supply,
Under the control of the controller, the battery is charged by the power of the local power supply facility in a state where the connection between the power supply network of the commercial power supply and the changeover switch is cut off by the control relay on the changeover switch side, and the battery is charged. Auxiliary power supply system that drives the load with the generated power. When the commercial power supply is not interrupted,
With a commercial power source at night, a control relay on the side of the selector switch, the commercial power source is supplied to the auxiliary power device via the selector switch, and the battery is charged by the commercial power source,
At least during the daytime, the load is driven by the electric power charged in the battery, and the electric power of the local power supply equipment is in a state where the connection between the power supply network of the commercial power supply and the changeover switch is cut off by the control relay on the changeover switch side. The auxiliary power supply system according to claim 3, wherein the power is output to a power network of the commercial power supply.

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