Power supply system

Abstract

The present invention provides a power supply system that can increase the remaining energy storage capacity of a power storage device when a power generation device stops generating power. [Solution] A power supply system is provided at facility 3, and a power line 2 connected to a power grid 1 is connected to a power generator 9, a power storage device 14, and a power load 8. The power generator 9 and the power storage device 14 can communicate with each other directly or indirectly via a communication device 7. The power generator 9 transmits information about the planned shutdown of power generation or information indicating that power generation has been stopped to the power storage device 14 or the communication device 7. When the power storage device 14 receives the information about the planned shutdown of power generation or the information indicating that power generation has been stopped from the power generator 9 or the communication device 7, it starts a remaining charge increase process to increase the remaining charge.

Description

Technical Field

[0001] The present invention relates to a power supply system provided in a facility, in which a power generation device, a power storage device, and a power load are connected to a power line connected to a power grid.

Background Art

[0002] Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2016-73073) describes a power supply system provided with a power generation device and a power storage device. When a power generation device and a power storage device are provided, there is an advantage that power can be supplied from the power generation device and the power storage device to the power load even if a power outage occurs in the power grid. Further, even if one of the power generation device and the power storage device stops operating while a power outage is occurring in the power grid, if the other is operating, the supply of power to the power load can be continued.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a power supply system provided with a power generation device and a power storage device, even if a power outage occurs in the power grid while the power generation device has stopped operating, power can be supplied from the power storage device to the power load up to the remaining stored power (charge rate (SOC: State Of Charge)). Therefore, it is preferable for the power storage device to increase the remaining stored power in advance while the power grid is not experiencing a power outage if it is known that the power generation device has stopped operating or if it is known that the power generation device is scheduled to stop operating.

[0005] However, conventional power supply systems are not configured to transmit information from the power generation device to the energy storage device when the power generation device has stopped operating or is scheduled to stop operating. Therefore, even if the power generation device stops operating or is scheduled to stop operating, the energy storage device cannot know this and cannot perform any processing to increase the remaining energy storage capacity in advance.

[0006] The present invention has been made in view of the above-mentioned problems, and its objective is to provide a power supply system that can increase the remaining amount of energy stored in an energy storage device when a power generation device stops generating power. [Means for solving the problem]

[0007] A characteristic configuration of the power supply system according to the present invention for achieving the above objective is a power supply system in which a power generation device, a power storage device, and a power load are connected to a power line installed in a facility and connected to a power grid, The power generation device and the energy storage device are capable of communicating information with each other directly or indirectly via a communication device. The power generation device transmits information regarding the planned cessation of power generation or information indicating that power generation has been stopped to the energy storage device or the communication device. The aforementioned energy storage device starts a remaining charge increase process to increase the remaining energy storage capacity when it receives the scheduled power generation stop information or the power generation stop information from the power generation device or the communication device.

[0008] According to the above configuration, the energy storage device can receive information from the power generation device or communication device indicating either a planned power generation shutdown or a power generation shutdown. When the energy storage device receives the planned power generation shutdown information or the power generation shutdown information from the power generation device or communication device, it can start a remaining charge increase process to increase the remaining charge. As a result, even if a power outage occurs in the power grid while the power generation device is shut down, the energy storage device, with its increased remaining charge due to the remaining charge increase process, can supply sufficient power to the power load. Therefore, it is possible to provide a power supply system that can increase the remaining charge of the energy storage device when the power generation device stops generating power.

[0009] Another characteristic configuration of the power supply system according to the present invention is that, when the energy storage device receives the scheduled power generation stop information from the power generation device or the communication device, it performs the remaining charge increase process so that the remaining energy storage device reaches a predetermined target value by the scheduled time when the power generation device stops generating power.

[0010] According to the above characteristic configuration, it is expected that the remaining charge in the energy storage device will reach a predetermined target value by the scheduled shutdown time when the power generation device stops generating power. As a result, even if a power outage occurs in the power grid after the scheduled shutdown time, sufficient power can be supplied to the power load from the energy storage device, whose remaining charge has increased to the target value through the charge increase process.

[0011] Another characteristic configuration of the power supply system according to the present invention is that when the energy storage device receives the power generation stop information from the power generation device or the communication device, it performs the remaining charge increase process so that the remaining energy storage amount reaches a predetermined target value.

[0012] According to the above characteristic configuration, it is expected that the remaining charge in the energy storage device will reach a predetermined target value after the power generation device stops generating power. As a result, even if a power outage occurs in the power grid after the power generation device stops generating power, sufficient power can be supplied to the power load from the energy storage device, whose remaining charge has increased to the target value through the charge increase process.

[0013] Another characteristic configuration of the power supply system according to the present invention is that the energy storage device includes an input receiving unit that receives the target value.

[0014] According to the above feature configuration, when increasing the remaining energy capacity during the remaining energy capacity increase process, the target value of the remaining energy capacity can be freely set according to the information received by the input receiving unit.

[0015] Another characteristic configuration of the power supply system according to the present invention is that the power storage device does not discharge while performing the remaining amount increase process.

[0016] According to the above characteristic configuration, it is possible to prevent the remaining power storage amount from decreasing while performing the remaining amount increase process.

[0017] Another characteristic configuration of the power supply system according to the present invention is that the power generation device transmits power generation start information indicating that power generation has started to the power storage device or the communication device, and when the power storage device receives the power generation start information from the power generation device or the communication device while performing the remaining amount increase process, the power storage device ends the remaining amount increase process.

[0018] According to the above characteristic configuration, the power storage device can receive power generation start information indicating that power generation has started from the power generation device or the communication device. And when the power storage device receives the power generation start information from the power generation device or the communication device while performing the remaining amount increase process, the power storage device ends the remaining amount increase process. As a result, power can be supplied from the power generation device and the power storage device to the power load.

Brief Description of Drawings

[0019] [Figure 1] It is a diagram showing the configuration of the power supply system. [Figure 2] It is a diagram showing an example of the transition of the generated power of the power generation device and the remaining power storage amount of the power storage device. [Figure 3] It is a diagram showing a comparative example of the transition of the generated power of the power generation device and the remaining power storage amount of the power storage device. [Figure 4] It is a diagram showing another configuration of the power supply system.

Modes for Carrying Out the Invention

[0020] The power supply system according to an embodiment of the present invention will be described below. FIG. 1 is a diagram showing the configuration of a power supply system. As shown in the figure, the power supply system is provided in a facility 3 such as a residential house or a business office, and a power generation device 9, a power storage device 14, and a power load 8 are connected to a power line 2 connected to a power grid 1. The power generation device 9 is connected to a first connection point P1 of the power line 2, and the power storage device 14 and the power load 8 are connected to a second connection point P2 of the power line 2. The first connection point P1 is located on the upstream side (i.e., the side closer to the power grid 1) than the second connection point P2.

[0021] The power generation device 9 includes a power generation unit 10 that generates power by consuming fuel gas, a power generation control unit 11 that controls the operation of the power generation unit 10, and a power generation side communication unit 12. The power generation device 9 is a fuel cell power generation device, an engine-driven power generation device, or the like. When the power generation device 9 is a fuel cell power generation device, the fuel gas supplied to the power generation unit 10 is supply gas supplied via a gas meter 13, or gas obtained by reforming the supply gas supplied via the gas meter 13. In the example shown in FIG. 1, a raw fuel gas containing hydrocarbons such as city gas is supplied to the power generation device 9 as supply gas. Then, in the power generation unit 10, power generation is performed by consuming a fuel gas containing hydrogen obtained by reforming the supply gas (raw fuel gas). The power generation device 9 can perform information communication with other devices connected to an information communication line 4 via the power generation side communication unit 12. For example, the power generation device 9 can perform information communication with a power generation management server 5. The operations of the power generation unit 10 and the power generation side communication unit 12 are controlled by the power generation control unit 11.

[0022] In the middle of the power line 2, on the upstream side (power grid 1 side) from the first connection point P1, a current measuring device 19 that measures the current value flowing from the power grid 1 side toward the first connection point P1 is provided. The current measuring device 19 is configured using, for example, a current transformer (instrument current transformer) used to detect the current value of power in the power line 2. The measurement result of the current measuring device 19 is transmitted to the power generation device 9, and the power generation control unit 11 derives the power value in the power line 2 from the product of the current value measured by the current measuring device 19 and a predetermined voltage value (for example, 100V, 200V, etc.).

[0023] The energy storage device 14 comprises an energy storage unit 15, an energy storage control unit 16, an energy storage-side communication unit 17, and an input receiving unit 18. The energy storage unit 15 can be configured using, for example, a secondary battery such as a lithium-ion battery. The energy storage control unit 16 of the energy storage device 14 controls the operation of the energy storage unit 15 to control the output power (discharge power) from the energy storage unit 15 to the power line 2 and the input power (charging power) from the power line 2 to the energy storage unit 15. The energy storage device 14 can communicate information with other devices connected to the information communication line 4 via the energy storage-side communication unit 17. The energy storage device 14 can communicate information with the energy storage management server 6. The operation of the energy storage unit 15 and the energy storage side communication unit 17 is controlled by the energy storage control unit 16.

[0024] A current measuring device 20 is installed between the first connection point P1 and the second connection point P2 in the power line 2 to measure the current value flowing from the first connection point P1 to the second connection point P2. The current measuring device 20 is constructed using, for example, a current transformer (instrument current transformer) used to detect the current value of power in the power line 2. The measurement result of the current measuring device 20 is transmitted to the energy storage device 14, and the energy storage control unit 16 derives the power value in the power line 2 from the product of the current value measured by the current measuring device 20 and a predetermined voltage value (for example, 100V, 200V, etc.).

[0025] The input receiving unit 18 of the energy storage device 14 can accept information input. For example, the input receiving unit 18 can accept input from the user for a target value of the remaining energy storage capacity (state of charge (SOC)) as described later.

[0026] The power generation device 9 and the energy storage device 14 can communicate with each other directly or indirectly via the communication device 7. In the example shown in Figure 1, the power generation management server 5 and the energy storage management server 6 can communicate with each other. Furthermore, the power generation device 9 and the energy storage device 14 can communicate with the power generation management server 5 and the energy storage management server 6, which are external communication devices 7 of the facility 3.

[0027] The gas meter 13 is configured to activate an alarm or shut off the supply of gas if the state in which the flow rate of supplied gas is less than or equal to the first set determination amount continues for a set determination period or longer, or if the state in which the non-leakage condition is met, such as the cumulative flow rate of supplied gas during the set determination period being less than or equal to the second set determination amount, does not occur a set number of times during the leak determination period.

[0028] Therefore, the power generation control unit 11 of the power generation device 9 performs a set timing to set the amount of raw fuel gas supplied for power generation in the power generation unit 10 to an amount that the gas meter 13 determines to satisfy the non-leakage condition, so that the gas meter 13 determines that the non-leakage condition has been met a set number of times during the leakage determination period. Specifically, the power generation control unit 11 performs a leakage determination avoidance process by transitioning to a standby state within a predetermined processing period (e.g., 27 days) that is the same length as or shorter than the leakage determination period (e.g., 30 days), and setting the amount of raw fuel gas supplied for power generation in the power generation unit 10 to an amount that the gas meter 13 determines to satisfy the non-leakage condition, and continuing this standby state for a predetermined period. For example, in the leakage determination avoidance process, the power generation control unit 11 transitions to a standby state (i.e., power generation stopped state) where the amount of raw fuel gas supplied for power generation in the power generation unit 10 is set to zero, and continues this standby state for a predetermined period (e.g., 24 hours).

[0029] The power generation control unit 11 has predetermined a schedule for performing leakage detection avoidance processing. In other words, the power generation control unit 11 stores power generation stop schedule information in a storage unit (not shown) regarding the schedule for stopping power generation at the power generation unit 10. For example, the power generation stop schedule information includes information about the scheduled time (including information about the scheduled date) when the power generation device 9 will stop generating power. The power generation control unit 11 then transmits the power generation stop schedule information to the energy storage device 14 or the communication device 7 (i.e., the power generation management server 5). The power generation stop schedule information also includes information that can identify the power generation device 9. In other words, the power generation management server 5, upon receiving the power generation stop schedule information, can identify which of the multiple power generation devices 9 connected to the information communication line 4 transmitted the information.

[0030] The power generation control unit 11 may also stop power generation in the power generation unit 10 for reasons other than the leakage detection avoidance process. For example, the power generation control unit 11 may stop power generation in the power generation unit 10 in response to an error occurring in the power generation device 9.

[0031] The power generation control unit 11 transmits power generation stop information to the energy storage device 14 or the communication device 7 in all cases where power generation at the power generation unit 10 is stopped, i.e., when power generation at the power generation unit 10 is actually stopped as planned after transmitting the power generation stop information, when power generation at the power generation unit 10 is stopped without transmitting the power generation stop information, and when power generation at the power generation unit 10 is stopped for reasons other than those planned after transmitting the power generation stop information. The power generation stop information also includes information that allows the power generation unit 9 to be identified. In other words, the power generation management server 5 that receives the power generation stop information can identify which of the multiple power generation units 9 connected to the information communication line 4 transmitted the power generation stop information.

[0032] When the power generation management server 5, acting as a communication device 7, receives information about a planned power shutdown or power shutdown from a power generation device 9, it transmits that information to the energy storage management server 6. The energy storage management server 6, acting as a communication device 7, then uses information to identify which power generation device 9 transmitted the information and transmits it to the energy storage device 14, which is installed in the same facility 3 as the power generation device 9. In other words, the energy storage device 14 can receive information about a planned power shutdown or power shutdown from either the power generation device 9 or the communication device 7.

[0033] When a power generator 9 starts generating power after being stopped, it transmits power generation start information to the energy storage device 14 or the communication device 7 to indicate that power generation has started. The power generation start information also includes information that identifies the power generator 9. In other words, the power generation management server 5, upon receiving the power generation start information, can identify which of the multiple power generators 9 connected to the information communication line 4 transmitted the information.

[0034] When the power generation management server 5, acting as a communication device 7, receives power generation start information from the power generation device 9, it transmits that power generation start information to the energy storage management server 6. The energy storage management server 6, acting as a communication device 7, then uses information to identify which power generation device 9 transmitted the power generation start information to transmit it to the energy storage device 14, which is installed in the same facility 3 as the power generation device 9. In other words, the energy storage device 14 can receive power generation start information from either the power generation device 9 or the communication device 7.

[0035] When the energy storage device 14 receives information about a planned power shutdown or information about a power shutdown from the power generation device 9 or the communication device 7, it starts a process to increase the remaining energy storage capacity. In other words, when the energy storage device 14 receives information about a planned power shutdown from the power generation device 9 or the communication device 7, it starts the process to increase the remaining energy storage capacity, and it also starts the process to increase the remaining energy storage capacity when it subsequently receives information about a power shutdown from the power generation device 9 or the communication device 7. In this embodiment, the process to increase the remaining energy storage capacity performed after receiving information about a planned power shutdown is the same as the process to increase the remaining energy storage capacity performed after receiving information about a power shutdown. Therefore, it can be assumed that the process to increase the remaining energy storage capacity continues after receiving information about a power shutdown while the process is being performed after receiving information about a planned power shutdown.

[0036] In addition, if the energy storage device 14 receives power generation start information from the power generation device 9 or the communication device 7 while it is performing the remaining charge increase process in response to receiving power generation stop scheduled information or power generation stop information, it terminates the remaining charge increase process. In other words, after receiving power generation stop scheduled information or power generation stop information, the energy storage device 14 will not terminate the remaining charge increase process unless it receives power generation start information. Details of this remaining charge increase process will be described later.

[0037] The following describes the changes in the power generated by the power generation device 9 and the remaining energy stored in the energy storage device 14. Figure 2 shows the changes in power generation from the power generation device 9 and the remaining charge in the energy storage device 14 in the example. Figure 3 shows the changes in power generation from the power generation device 9 and the remaining charge in the energy storage device 14 in the comparative example.

[0038] The power generation control unit 11 of the power generation device 9 adjusts the power generated by the power generation unit 10 so that the power measured by the current meter 19, i.e., the power supplied from the power system 1 to the first connection point P1, becomes, for example, zero. The energy storage control unit 16 of the energy storage device 14 adjusts the charging and discharging power of the storage battery so that the power measured by the current meter 20, i.e., the power supplied from the first connection point P1 to the second connection point P2, follows the rated power generation power of EF. In other words, the energy storage control unit 16 adjusts the charging and discharging power of the storage battery so that the power generation device 9 operates at its rated power generation power. For example, if the rated power generation power of the power generation device 9 is 700W, the energy storage control unit 16 discharges from the storage unit 15 if the load power of the power load 8 is greater than 700W, and charges the storage battery if the load power is less than 700W.

[0039] In the example shown in Figure 2, the power generation device 9 transmits information indicating a planned power generation stop time of 10:00 to the energy storage device 14 or the communication device 7 at 8:00. As a result, the energy storage control unit 16 receives this power generation stop information at 8:00.

[0040] Then, at 8:00, the energy storage control unit 16 starts a remaining charge increase process to increase the remaining charge of the storage battery. In this embodiment, when the energy storage device 14 receives information about the planned power generation stop from the power generation device 9 or the communication device 7, it performs a remaining charge increase process to charge the battery so that the remaining charge reaches a predetermined target value by the scheduled time when the power generation device 9 stops power generation. Furthermore, the energy storage device 14 does not discharge while performing the remaining charge increase process. In other words, a decrease in the remaining charge is prevented while the remaining charge increase process is being performed. As a result, in the example shown in Figure 2, at 10:00, the remaining charge of the energy storage unit 15 is at the target value of SOC: 100%. The target value of the remaining charge can be received from the user by the input reception unit 18 of the energy storage device 14. In other words, the target value of the remaining charge when increasing the remaining charge in the remaining charge increase process can be freely set by the input reception unit 18 according to the information received.

[0041] Furthermore, if the remaining charge in the power storage unit 15 has not reached the target value of SOC:100% by the scheduled shutdown time when the power generator 9 stops generating power, the power storage control unit 16 will charge the unit so that the remaining charge reaches the target value while the remaining charge increase process is being performed. Even if the remaining charge in the power storage unit 15 reaches the target value of SOC:100% while the remaining charge increase process is being performed, the power storage control unit 16 will not terminate the remaining charge increase process until it receives information that power generation has started. In other words, the power storage unit 14 will not discharge until it receives information that power generation has started, and will maintain the remaining charge at the target value.

[0042] In the example shown in Figure 2, the power generation device 9 stops generating power in the power generation unit 10 at 10:00. Although not shown in the illustration, the power generation device 9 transmits power generation stop information to the energy storage device 14 or the communication device 7 at 10:00, and continues to stop generating power from 10:00 to 19:00. Then, the energy storage device 14 starts (continues) the remaining charge increase process in response to the power generation stop information.

[0043] Subsequently, if the power generation device 9 starts power generation from a stopped state, it transmits power generation start information to the energy storage device 14 or the communication device 7 to indicate that power generation has started. If the energy storage device 14 receives the power generation start information from the power generation device 9 or the communication device 7 while performing the remaining charge increase process, it terminates the remaining charge increase process. In the example shown in Figure 2, the power generation control unit 11 starts power generation at the power generation unit 10 at 19:00 and transmits the power generation start information to the energy storage device 14 or the communication device 7. As a result, the energy storage control unit 16 receives the power generation start information at 19:00 and terminates the remaining charge increase process accordingly. The energy storage control unit 16 then performs discharge from 19:00 onward.

[0044] Although not shown in the diagram, even if the energy storage device 14 receives information about the planned power generation shutdown without receiving a transmission of that information, it will perform a remaining charge increase process to charge the device so that the remaining charge reaches a predetermined target value. As a result, it is expected that the remaining charge of the energy storage device 14 will reach the predetermined target value after the power generation device 9 stops generating power. Therefore, even if a power outage occurs in the power system 1 after the power generation device 9 stops generating power, sufficient power can be supplied to the power load 8 from the energy storage device 14, whose remaining charge has been increased to the target value through the remaining charge increase process.

[0045] Furthermore, if a power outage occurs in the power system 1 while the energy storage device 14 is performing the remaining charge increase process, the energy storage device 14 can terminate the remaining charge increase process and discharge from the energy storage unit 15 to the power line 2.

[0046] Thus, in the power supply system of this embodiment, the remaining charge in the energy storage device 14 is maintained at a high level while the power generator 9 is stopped. Therefore, even if a power outage occurs in the power grid 1 while the power generator 9 is stopped, power can be supplied to the power load 8 of the facility 3 from the energy storage device 14.

[0047] Figure 3 shows an example where the process of increasing the remaining charge of the energy storage device 14 as described above is not performed. In this case, the energy storage device 14 cannot know that the power generator 9 has stopped generating power, and therefore, even while the power generator 9 is stopped generating power, it continues to charge and discharge according to the load of the house during the charging and discharging time periods set by the users of facility 3. As a result, even while the power generator 9 is stopped generating power, the remaining charge of the energy storage device 14 increases or decreases significantly. Consequently, if a power outage occurs in the power grid 1 while the power generator 9 is stopped, there is a possibility that the energy storage device 14 will not be able to supply power to the power load 8 of facility 3.

[0048] As described above, in this embodiment, the energy storage device 14 can receive information indicating a planned power generation shutdown or power generation shutdown information indicating that power generation has been stopped from the power generation device 9 or the communication device 7. When the energy storage device 14 receives the planned power generation shutdown information or power generation shutdown information from the power generation device 9 or the communication device 7, it can start a remaining charge increase process to increase the remaining energy storage capacity. As a result, even if a power outage occurs in the power system 1 while the power generation device 9 is shut down, sufficient power can be supplied to the power load 8 from the energy storage device 14, whose remaining energy storage capacity has been increased by the remaining charge increase process.

[0049] <Another Embodiment> In the above embodiment, the configuration of the power supply system was described in detail, but the configuration can be changed as appropriate. Figure 4 shows another configuration of the power supply system. In this power supply system, the energy storage device 14 is connected to the first connection point P1 of the power line 2, and the power generator 9 and power load 8 are connected to the second connection point P2 of the power line 2. The first connection point P1 is located upstream of the second connection point P2 (i.e., closer to the power system 1). In this case, the power generator 9 operates at a constant power generation power, such as the rated power generation power. The energy storage device 14 also adjusts the charging and discharging power of the storage unit 15 so that the power measured by the current meter 20, i.e., the power supplied from the power system 1 to the first connection point P1, becomes, for example, zero. Therefore, if the load power of the power load 8 is greater than the power generated by the power generator 9, i.e., if a power deficit occurs, the energy storage device 14 discharges to cover the power deficit. Conversely, if the load power of the power load 8 is less than the power generated by the power generator 9, i.e., if a power surplus occurs, the energy storage device 14 charges the surplus power.

[0050] In the above embodiment, an example was described in which the communication device 7 is composed of a power generation management server 5 and a power storage management server 6, but the communication device 7 may also be composed of a single server.

[0051] In the above embodiment, an example was described in which the power generation device 9 and the energy storage device 14 communicate information via the communication device 7. However, the power generation device 9 and the energy storage device 14 may communicate information directly within the facility 3 without going through the communication device 7.

[0052] In the embodiments described above, the present invention has been explained with reference to several numerical examples, but these numerical values ​​are provided for illustrative purposes only and can be changed as appropriate.

[0053] The configurations disclosed in the above embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with configurations disclosed in other embodiments, as long as no inconsistencies arise. Furthermore, the embodiments disclosed herein are illustrative, and the embodiments of the present invention are not limited thereto and can be modified as appropriate without departing from the purpose of the present invention. [Industrial applicability]

[0054] The present invention can be used in a power supply system that can increase the remaining energy storage capacity of a power storage device when a power generation device stops generating power. [Explanation of Symbols]

[0055] 1: Power system 2: Power lines 3: Facilities 5: Power generation management server (communication device 7) 6: Energy storage management server (communication device 7) 7: Communication equipment 8: Power load 9: Power generation equipment 14: Energy storage device 18: Input Reception Section

Claims

1. A power supply system installed in a facility, in which a power generation device, a power storage device, and a power load are connected to a power line connected to the power grid, The power generation device and the energy storage device are capable of communicating information with each other directly or indirectly via a communication device. The power generation device transmits information regarding the planned cessation of power generation or information indicating that power generation has been stopped to the energy storage device or the communication device. The power supply system, which includes the energy storage device, is configured to start a remaining charge increase process to increase the remaining energy storage capacity when it receives the scheduled power generation stop information or the power generation stop information from the power generation device or the communication device.

2. The power supply system according to claim 1, in which the energy storage device, upon receiving the scheduled power generation stop information from the power generation device or the communication device, performs the remaining charge increase process, which involves charging the energy storage device so that the remaining energy storage amount reaches a predetermined target value by the scheduled time when the power generation device stops generating power.

3. The power supply system according to claim 1, wherein when the power storage device receives the power generation stop information from the power generation device or the communication device, it performs the remaining charge increase process by charging the power storage device so that the remaining charge reaches a predetermined target value.

4. The power supply system according to claim 2 or 3, further comprising an input receiving unit for receiving the target value as the energy storage device.

5. The power supply system according to any one of claims 1 to 3, wherein the energy storage device does not discharge while the remaining charge increase process is being performed.

6. The power generation device transmits power generation start information indicating that power generation has started to the energy storage device or the communication device. The power supply system according to any one of claims 1 to 3, wherein the energy storage device terminates the energy storage device's

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