Power supply system, operation method, program, and recording medium

Abstract

A power supply system (1a) includes a storage battery device and a fuel cell device. In a method for operating the power supply system (1a), at least one device selected from the group consisting of the storage battery device and the fuel cell device is operated under a restriction corresponding to the timing at which to perform the next instance of maintenance of the power supply system (1a).

Description

Power supply system, operation method, program and recording medium

[0001] The present disclosure relates to a power supply system, an operation method, a program, and a recording medium.

[0002] Patent Document 1 describes identifying the timing of maintenance based on the amount of operation of a fuel cell power generation system.

[0003] JP 2012-212660 A

[0004] The present disclosure provides a technique suitable for ensuring the reliability of a power supply system while allowing the power supply system to demonstrate its capabilities in accordance with the timing of maintenance of the power supply system.

[0005] The present disclosure provides a method for operating a power supply system equipped with a storage battery device and a fuel cell device, the method including operating at least one device selected from the group consisting of the storage battery device and the fuel cell device under constraints according to the timing of the next maintenance of the power supply system.

[0006] In another aspect, the present disclosure provides a program comprising instructions that, when executed by a processor, cause the processor to execute a control method for a power supply system, wherein the power supply system comprises a storage battery device and a fuel cell device, and the control method includes operating at least one device selected from the group consisting of the storage battery device and the fuel cell device under constraints according to the timing of the next maintenance of the power supply system.

[0007] In another aspect, the present disclosure provides a computer-readable recording medium having the above program recorded thereon.

[0008] In another aspect, the present disclosure provides a power supply system including: a storage battery device; a fuel cell device; and a control device that controls the storage battery device and the fuel cell device, wherein the control device operates at least one device selected from the group consisting of the storage battery device and the fuel cell device under constraints according to the timing of the next maintenance of the power supply system.

[0009] The technology disclosed herein is suitable for ensuring the reliability of the power supply system while allowing the power supply system to demonstrate its capabilities in accordance with the timing of maintenance of the power supply system.

[0010] FIG. 1 is a configuration diagram of a power supply system according to an embodiment. FIG. 2 is a sequence diagram illustrating determination of timing for maintenance of the power supply system according to an embodiment. FIG. 3 is a sequence diagram illustrating control of the power supply system according to an embodiment. FIG. 4 is a table illustrating control of each device according to one specific example of an embodiment. FIG. 5 is a table illustrating first information displayed on a first terminal according to first to third specific examples of an embodiment.

[0011] (Knowledge, etc. that forms the basis of the present disclosure) Some users of power supply systems do not operate the power supply systems very often. Such users wish to reduce the frequency of power supply system maintenance and thereby reduce maintenance costs. The present disclosure provides a technology that is suitable for ensuring the reliability of the power supply system while enabling the power supply system to perform to its full potential, depending on the timing of power supply system maintenance.

[0012] Hereinafter, embodiments will be described in detail with reference to the drawings. However, unnecessary detailed description may be omitted. For example, detailed description of already well-known matters or redundant description of substantially the same configuration may be omitted.

[0013] The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter recited in the claims.

[0014] (Embodiment) Hereinafter, an embodiment will be described with reference to Figs.

[0015] 1 is a configuration diagram of a power supply system 1a according to an embodiment. The power supply system 1a is connected to a commercial power source 2. The power supply system 1a supplies power to a power load 5. The power supply system 1a is connected to an EMS (Energy Management System) server 52 via a network 60.

[0016] The power supply system 1a is a distributed power supply system and includes a solar power generation system 10, a fuel cell system 20, a storage battery system 30, a control device 50a, an electric circuit 70, a distribution board 4, a current sensor 3a, and a current sensor 3b.

[0017] The solar power generation facility 10 includes a solar power generation module 11, a DCDC converter 12, and a DC / AC inverter 13. DC power generated by the solar power generation module 11 is converted into DC power of a different voltage by the DCDC converter 12. The converted DC power is then converted into AC power by the DC / AC inverter 13. The AC power is supplied to an electric circuit 70.

[0018] The fuel cell equipment 20 includes a fuel cell stack 21, a DCDC converter 22, and a DCAC inverter 23. DC power generated by the fuel cell stack 21 is converted into DC power of a different voltage by the DCDC converter 22. The converted DC power is then converted into AC power by the DCAC inverter 23. The AC power is supplied to an electric circuit 70. The fuel cell equipment 20 is, for example, a polymer electrolyte fuel cell (PEFC) equipment, a solid oxide fuel cell (SOFC) equipment, or the like.

[0019] The battery equipment 30 includes a battery module 31, a bidirectional DC-DC converter 32, and a DC-AC inverter 33. The battery module 31 is, for example, a lithium-ion battery module, a nickel-metal hydride battery module, or a lead-acid battery module.

[0020] The power discharged from the storage battery module 31 is converted into DC power having a different voltage by the bidirectional DC-DC converter 32. The converted DC power is then converted into AC power by the DC-AC inverter 33. The AC power is supplied to the electric circuit 70.

[0021] The AC power supplied from the electric circuit 70 to the DCAC inverter 33 is converted into DC power. This DC power is then converted into DC power of a different voltage by the bidirectional DC-DC converter 32. The converted DC power is used to charge the storage battery module 31.

[0022] Power can flow from the electric circuit 70 to the commercial power supply 2. Power can flow from the commercial power supply 2 to the electric circuit 70. The current sensor 3a detects the current flowing between the electric circuit 70 and the commercial power supply 2. The control device 50a monitors the current detection value of the current sensor 3a, thereby allowing the power flowing from the commercial power supply 2 to the power supply system 1a or the power flowing from the power supply system 1a to the commercial power supply 2 to follow a target power (e.g., 0 W).

[0023] Electric power can flow from the electric circuit 70 to the electric load 5 via the distribution board 4. The current sensor 3b detects the current flowing through the electric load 5.

[0024] The storage battery facility 30 includes a control device 50b, the solar power generation facility 10 includes a control device 50c, and the fuel cell facility 20 includes a control device 50d.

[0025] The EMS server 52 may be a cloud server or an on-premise server. The network 60 may be a wired network or a wireless network. The network 60 is typically the Internet.

[0026] The control device 50a communicates with the current sensor 3a, the current sensor 3b, the control device 50b, the control device 50c, and the control device 50d. The control device 50a also communicates with the EMS server 52 via the network 60. Through these communications, the control device 50a generates control signals for controlling the control devices 50b, 50c, and 50d.

[0027] The control device 50b receives a control signal from the control device 50a. The control device 50b controls the bidirectional DC-DC converter 32 and the DC-AC inverter 33 based on the control signal. By controlling the bidirectional DC-DC converter 32, it is controlled whether the storage battery module 31 is charging, in standby mode, or discharging. By controlling the DC-AC inverter 33, power conversion between direct current and alternating current is performed. Through these controls, the power flowing between the storage battery equipment 30 and the electric circuit 70 is controlled.

[0028] Specifically, the charging and discharging power of the storage battery module 31a is controlled by controlling the bidirectional DC-DC converter 32. In the illustrated example, the charging and discharging of the storage battery module 31a is controlled by controlling the terminal voltage V1 of the bidirectional DC-DC converter 32 relative to the terminal voltage V2 of the DC-AC inverter 33.

[0029] The control device 50c receives a control signal from the control device 50a. The control device 50c controls the DCDC converter 12 and the DC-AC inverter 13 based on the control signal. By controlling the DCDC converter 12, the output voltage of the photovoltaic power generation module 11 is adjusted. By controlling the DC-AC inverter 13, power conversion between direct current and alternating current is performed. Through these controls, power is extracted from the photovoltaic power generation facility 10 to the electric circuit 70.

[0030] The control device 50d receives a control signal from the control device 50a. The control device 50d controls the DCDC converter 22 and the DC-AC inverter 23 based on the control signal. By controlling the DCDC converter 22, the output voltage of the fuel cell stack 21 is adjusted. By controlling the DC-AC inverter 23, power conversion between direct current and alternating current is performed. Through these controls, power is extracted from the fuel cell equipment 20 to the electrical circuit 70.

[0031] [1-2. Operation] FIG. 2 is a sequence diagram illustrating the determination of the timing of maintenance of the power supply system 1a in the embodiment. This determination is made using the EMS server 52, the first terminal 55, and the second terminal 57. The EMS server 52, the first terminal 55, and the second terminal 57 are connected to each other via a network 60. A management system 59 is configured including the EMS server 52, the first terminal 55, and the second terminal 57. In the embodiment, the maintenance of the power supply system 1a involves the replacement of at least one component of the power supply system 1a. In the embodiment, the at least one component includes at least one selected from the group consisting of the storage battery module 31 and the fuel cell stack 21. In the embodiment, steps S101 to S115 in the sequence diagram of FIG. 2 are performed based on the timing t of the previous maintenance of the power supply system 1a. PRE is executed immediately after

[0032] The first terminal 55 is used by a user 56 of the power supply system 1a. The second terminal 57 is used by a maintenance company 58 of the power supply system 1a. Each of the first terminal 55 and the second terminal 57 is, for example, a smartphone, a personal computer, a tablet, a mobile phone, a personal digital assistant (PDA), or the like.

[0033] 2, the first terminal 55 transmits schedule information for maintenance of the power supply system 1a to the EMS server 52. The schedule information includes the timing t NEXT In an embodiment, the timing t NEXT is what the user 56 wants as presented by the user 56. Typically, the schedule information is what the user 56 inputs into the first terminal 55.

[0034] In step S102, the EMS server 52 determines the maintenance interval p M Calculate the maintenance interval p M is the timing t of the previous maintenance of the power supply system 1aPRE Then, the next maintenance timing NEXT In the embodiment, the EMS server 52 stores the timing t PRE is read out and used for the calculation in step S102.

[0035] In step S103, the EMS server 52 determines the number of SB allowances N UNIT Calculate the number of SB allowances N UNIT is the unit time p UNIT This is the upper limit of the number of times the storage battery module 31 can be charged and discharged in a unit time p UNIT is, for example, one day. The number of charge / discharge cycles refers to the sum of the number of charge cycles and the number of discharge cycles. The number of charge cycles refers to the number of times the storage battery switches from a standby or discharging state to a charging state. The number of discharge cycles refers to the number of times the storage battery switches from a standby or charging state to a discharging state.

[0036] Specifically, the maintenance interval p M The upper limit of the number of times the storage battery module 31 can be charged and discharged (hereinafter referred to as the SB allowable number N TOTAL ) is determined in advance. TOTAL is based on the specifications of the storage battery module 31. The EMS server 52 determines the SB allowable number N TOTAL , maintenance interval p M and unit time p UNIT Based on this, the number of SB allowable times N UNIT More specifically, the allowable number of SBs N UNIT is the number of SB allowances N TOTAL , maintenance interval p M and unit time p UNIT Based on this, it is calculated by the following formula 1. Formula 1: N UNIT = N TOTAL ×p UNIT / p M

[0037] In the calculation using Equation 1, the value on the right side itself is N UNITAlternatively, the value obtained by rounding the value on the right side may be rounded up, down, or rounded off.

[0038] In step S104, the EMS server 52 determines the FC allowable time T UNIT Calculate the FC allowable time T UNIT is the unit time p UNIT This is the upper limit of the operating time of the fuel cell stack 21. The operating time of the fuel cell stack 21 is the count of the time that the fuel cell stack 21 is in the on state and generating power. Specifically, the operating time of the fuel cell stack 21 is the cumulative operating time of the fuel cell stack 21.

[0039] Specifically, the maintenance interval p M The upper limit of the operating time of the fuel cell stack 21 (hereinafter referred to as the FC allowable time T TOTAL ) is determined in advance. TOTAL is based on, for example, the specifications of the fuel cell stack 21. The EMS server 52 TOTAL , maintenance interval p M and unit time p UNIT Based on this, the FC allowable time T UNIT More specifically, the FC allowable time T UNIT is the FC allowable time T TOTAL , maintenance interval p M and unit time p UNIT Based on this, it is calculated by the following formula 2: Formula 2: T UNIT =T TOTAL ×p UNIT / p M

[0040] In the calculation using Equation 2, the value of the right side itself is T UNIT Alternatively, the value obtained by rounding the value on the right side may be rounded up, down, or rounded off.

[0041] In step S105, the EMS server 52 calculates the FC power generation amount E FCCalculate the amount of FC generated power E FC is the unit time p UNIT This is a predicted value of the amount of power generated by the fuel cell stack 21 at the time of the power generation. FC is the FC allowable time T UNIT It is calculated based on the following.

[0042] Specifically, the rated power generation P of the fuel cell stack 21 R is determined in advance. The EMS server 52 R and FC allowable time T UNIT Based on this, the amount of FC power generation E FC More specifically, the amount of FC generated power E FC is the rated power generation P R and FC allowable time T UNIT Based on this, it is calculated by the following Equation 3: E FC =P R ×T UNIT

[0043] In the calculation using Equation 3, the value on the right side itself is E FC Alternatively, the value obtained by rounding the value on the right side may be rounded up, down, or rounded off.

[0044] In step S106, the EMS server 52 calculates the purchased power amount E BUY Calculate the amount of purchased electricity E BUY is the unit time p UNIT The amount of purchased power E is a predicted value of the power flowing from the commercial power source 2 to the power supply system 1a. BUY is the amount of FC generated power E FC It is calculated based on the following.

[0045] In this embodiment, the memory of the EMS server 52 stores the time transition of the power consumption of the power load 5 over a predetermined time in the past and the time transition of the power generated by the photovoltaic power generation module 11 over a predetermined time in the past. The EMS server 52 reads out these time transitions from the memory. Then, the EMS server 52 calculates these time transitions and the FC power generation amount E FC Based on this, the amount of purchased electricity EBUY The predetermined time is, for example, one year.

[0046] Specifically, the EMS server 52 calculates the average power consumption of the power load 5 over a predetermined time period in the past by multiplying the average power consumption by the power load 5 over a unit time p UNIT By multiplying this, the average power consumption E of the power load 5 is L The EMS server 52 calculates the average power obtained by averaging the power generated by the photovoltaic power generation module 11 over a predetermined time period in the past. UNIT By multiplying by , the average power generation amount E of the photovoltaic power generation module 11 is obtained. PV Calculate the amount of purchased electricity E BUY is the average power consumption E L , average power generation amount E PV and FC power generation amount E FC Based on this, it is calculated by the following Equation 4: E BUY = E L -E PV -E FC

[0047] In the calculation using Equation 4, the value of the right side itself is E BUY Alternatively, the value obtained by rounding the value on the right side may be rounded up, down, or rounded off.

[0048] In step S107, the EMS server 52 transmits a first signal to the first terminal 55. The first signal includes first information. The first signal is a signal for displaying the first information on the first terminal 55. The first information is information related to the operation of the power supply system 1a. In this embodiment, the first information includes the allowable number of SBs N UNIT , FC allowable time T UNIT , FC power generation amount E FC and purchased electricity amount E BUY In the example of FIG. 2, the first information includes at least one selected from the group consisting of: UNIT , FC allowable time T UNIT , FC power generation amount E FC and purchased electricity amount E BUY Includes:

[0049] In step S108, the first terminal 55 displays the first information, and the user 56 can confirm the first information by looking at this display.

[0050] In step S109, the first terminal 55 transmits a first response to the EMS server 52. The first response is a response from the first terminal 55 to the EMS server 52 in response to the transmission of the first signal from the EMS server 52 to the first terminal 55. Specifically, the first response includes consent to the first information. The first response is also transmitted at timing t NEXT Typically, the consent and the request are input by the user 56 to the first terminal 55. The consent and the request may be in accordance with the will of the user 56.

[0051] In step S110, the EMS server 52 transmits a second signal to the second terminal 57. The second signal includes second information. The second signal is a signal for displaying the second information on the second terminal 57. The second information includes the next maintenance timing t NEXT Specifically, the second information includes the timing t NEXT The second information includes a request to perform maintenance at timing t NEXT The message includes information indicating that the message was submitted by the user 56 .

[0052] In step S111, the second terminal 57 displays the second information. The maintenance company 58 can confirm the second information by looking at this display.

[0053] In step S112, the second terminal 57 transmits a second response to the EMS server 52. The second response is a response from the second terminal 57 to the EMS server 52 in response to the transmission of the second signal from the EMS server 52 to the second terminal 57. The second response is transmitted at timing t NEXT The consent includes consent to perform maintenance at the second terminal 57. Typically, the consent is input by the maintenance company 58 into the second terminal 57. The consent may be in line with the intention of the maintenance company 58.

[0054] In step S113, the EMS server 52 sets the flag to ON. The flag being ON indicates that the next maintenance timing t NEXT This indicates that the decision has been made.

[0055] In step S114, the EMS server 52 transmits a third signal to the first terminal 55. The third signal includes third information. The third signal is a signal for displaying the third information on the first terminal 55. The third information is transmitted at timing t NEXT This includes consent to carry out maintenance in the

[0056] In step S115, the first terminal 55 displays the third information. The user 56 can check the third information by looking at this display. Specifically, the user 56 can check the third information by looking at this display at the timing t NEXT This confirms that approval has been given to carry out maintenance at

[0057] It is possible that the user 56 who viewed the first information in step S108 does not accept the first information. In this case, the first terminal 55 transmits a re-presentation signal to the EMS server 52. The re-presentation signal includes dissatisfaction with the first information. The re-presentation signal also includes schedule information different from that of the previous step S101. The different schedule information is presented at a different timing t from that of the previous step S101. NEXT Typically, the complaints and other schedule information are input by the user 56 to the first terminal 55. The complaints and other schedule information may be in accordance with the intention of the user 56. When the first terminal 55 sends a resubmission signal to the EMS server 52, steps S102 to S108 are performed again.

[0058] In the example of FIG. 2, steps S113 to S115 are executed on the assumption that the maintenance company 58 will perform the maintenance. However, if the maintenance company 58 who has viewed the second information in step S111 NEXTIn some cases, the maintenance company 58 may not agree to perform the maintenance at the designated location. In this case, the second terminal 57 transmits a refusal signal to the EMS server 52. The refusal signal includes a refusal of the maintenance. Typically, the refusal is input into the second terminal 57 by the maintenance company 58. The refusal may be in line with the intention of the maintenance company 58. When the EMS server 52 receives the refusal signal, it transmits second information to the terminal of the other maintenance company. When a second response is transmitted from the terminal of the other maintenance company to the EMS server 52, steps S113 to S115 are executed on the assumption that the other maintenance company will perform the maintenance.

[0059] 3 is a sequence diagram for explaining the control of the power supply system 1a in the embodiment. NEXT The control cycle including steps S202 to S213 is repeated until the time p UNIT is shorter than.

[0060] In step S201, the EMS server 52 transmits an operation instruction signal to the control device 50a. The operation instruction signal is transmitted in response to the SB allowable number N UNIT and FC allowable time T UNIT Includes:

[0061] In step S202, the control device 50a receives the current detection value of the current sensor 3b from the current sensor 3b. This current detection value represents the current currently flowing through the power load 5.

[0062] In step S203, the control device 50a receives the PV operation record from the control device 50c. The PV operation record includes the current power generation P of the photovoltaic power generation module 11. PV Contains information representing the

[0063] In step S204, the control device 50a calculates the SB target power and the FC target power based on the received current detection value and PV operation record. The SB target power is a target value for the charge / discharge power of the storage battery module 31. The charge / discharge power is charge power or discharge power. A positive charge / discharge power indicates discharge power, and a negative absolute value of the charge / discharge power indicates charge power. The FC target power is a target value for the power generated by the fuel cell stack 21.

[0064] In this embodiment, the voltage of the power load 5 is known. Therefore, the power P flowing from the electric path 70 to the power load 5 can be calculated based on the detected voltage and current values. L The generated power P PV , the sum of the SB target power and the FC target power is power P L The SB target power and the FC target power are calculated so that the ratio between the SB target power and the FC target power is equal to: The ratio between the SB target power and the FC target power is determined, for example, by a predetermined algorithm.

[0065] In the calculation of the SB target power and the FC target power in step S204, the unit time p UNIT The number of charge / discharge cycles (hereinafter referred to as the number of SB charge / discharge cycles) N COUNT and the unit time p of the fuel cell stack 21 UNIT The operating time (hereinafter referred to as FC operating time) T COUNT is taken into consideration. SB charge / discharge count N COUNT is the number of times SB is allowed N UNIT If the FC operation time T COUNT is the FC allowable time T UNIT If the SB charge / discharge count N is greater than or equal to the FC target power, the FC target power is set to zero. Therefore, the fuel cell stack 21 is not operated and is in a stopped state. COUNT is a time that reflects the SB operation results of step S211 in the past control cycle. COUNT is a value that reflects the FC operation results of step S213 in the past control cycle. COUNT Specifically, the unit time pUNIT The cumulative number of charge / discharge cycles is the FC operating time T COUNT Specifically, the unit time p UNIT is the cumulative operating time.

[0066] In step S205, the control device 50a transmits a charge / discharge instruction to the control device 50b. The charge / discharge instruction includes an instruction to cause the storage battery module 31 to be in a charging state, a discharging state, or a standby state. The charge / discharge instruction also includes the SB target power.

[0067] In step S206, the control device 50b controls the storage battery module 31 in accordance with the charge / discharge command. Specifically, the control device 50b controls the bidirectional DC-DC converter 32 in accordance with the charge / discharge command, thereby controlling the charging / discharging of the storage battery module 31. In this way, the storage battery module 31 is controlled to be in a charging state, a discharging state, or a standby state. Furthermore, the charging / discharging power of the storage battery module 31 tracks the SB target power.

[0068] In step S207, the control device 50a transmits a PV power generation instruction to the control device 50c. The PV power generation instruction includes control details of the DCDC converter 12 for extracting power from the photovoltaic power generation module 11.

[0069] In step S208, the control device 50c controls the photovoltaic power generation module 11 in accordance with the PV power generation instruction. Specifically, the control device 50c controls the DCDC converter 12 in accordance with the PV power generation instruction. In this way, the power generation of the photovoltaic power generation module 11 is controlled, and the power generation of the photovoltaic power generation module 11 (hereinafter, PV power generation) is controlled.

[0070] In step S209, the control device 50a transmits an FC power generation instruction to the control device 50d. The FC power generation instruction includes an instruction as to whether the fuel cell stack 21 should be in a power generating state or in a stopped state. The FC power generation instruction also includes an FC target power.

[0071] In step S210, the control device 50d controls the power generated by the fuel cell stack 21 in accordance with the FC power generation command. Specifically, the control device 50d controls the power generated by the fuel cell stack 21 in accordance with the FC power generation command. In this way, the power generation (hereinafter referred to as FC power generation) of the fuel cell stack 21 is controlled. Specifically, it controls whether the fuel cell stack 21 is in a power generation state or a stopped state. In addition, the power generated by the fuel cell stack 21 follows the FC target power.

[0072] In step S211, the control device 50b transmits the SB operation record to the control device 50a. The SB operation record includes the number of times the storage battery module 31 has been charged and discharged. The SB operation record also includes information indicating the current charge and discharge power of the storage battery module 31. The SB operation record is recorded in the memory of the control device 50a.

[0073] In step S212, the control device 50c transmits the PV operation record to the control device 50a. The PV operation record includes the current power generation P of the photovoltaic power generation module 11. PV The PV operation record is recorded in the memory of the control device 50a.

[0074] In step S213, the control device 50d transmits the FC operation record to the control device 50a. The FC operation record includes the operating time of the fuel cell stack 21. The FC operation record also includes information indicating the current power generation of the fuel cell stack 21. The FC operation record is recorded in the memory of the control device 50a.

[0075] 4 is a table for explaining the control of each device according to one specific example of the embodiment. This specific example will be explained below with reference to FIG. 4. Hereinafter, the maximum power that the fuel cell stack 21 can generate will be referred to as the maximum generated power P FCMAX As mentioned above, the power P L is the power flowing from the electric circuit 70 to the electric load 5. PV is the power generated by the photovoltaic power generation module 11. SB charge / discharge count N COUNT is the unit time p of the storage battery module 31 UNIT The number of charge / discharge cycles is the FC operating time TCOUNT is the unit time p UNIT This is the operating time.

[0076] In FIG. 4, conditions (1) to (10) are described. Conditions (1) to (10) are explained as follows. Note that the operation mode of the power supply system 1a when conditions (1) to (3) are satisfied can be called the normal mode. Condition (1) is that the number of SB charge / discharge cycles N COUNT is the number of times SB is allowed N UNIT is smaller than the FC operating time T COUNT is the FC allowable time T UNIT and the power P L is the generated power P PV The condition (2) is that the number of SB charge / discharge times N COUNT is the number of times SB is allowed N UNIT is smaller than the FC operating time T COUNT is the FC allowable time T UNIT is smaller than the power P L is the generated power P PV and the power P L is the generated power P PV and maximum power generation P FCMAX The condition (3) is that the number of SB charge / discharge times N COUNT is the number of times SB is allowed N UNIT is smaller than the FC operating time T COUNT is the FC allowable time T UNIT and the power P L is the generated power P PV and maximum power generation P FCMAX The condition (4) is that the number of SB charge / discharge times N COUNT is the number of times SB is allowed N UNIT is smaller than the FC operating time T COUNT is the FC allowable time T UNIT or more, and the power P L is the generated power P PV The condition (5) is that the number of SB charge / discharge times N COUNT is the number of times SB is allowed N UNIT is smaller than the FC operating time TCOUNT is the FC allowable time T UNIT or more, and the power P L is the generated power P PV The condition (6) is that the number of SB charge / discharge times N COUNT is the number of times SB is allowed N UNIT The above is the FC operating time T COUNT is the FC allowable time T UNIT and the power P L is the generated power P PV The condition (7) is that the number of SB charge / discharge times N COUNT is the number of times SB is allowed N UNIT The above is the FC operating time T COUNT is the FC allowable time T UNIT is smaller than the power P L is the generated power P PV and the power P L is the generated power P PV and maximum power generation P FCMAX The condition (8) is that the number of SB charge / discharge times N COUNT is the number of times SB is allowed N UNIT The above is the FC operating time T COUNT is the FC allowable time T UNIT and the power P L is the generated power P PV and maximum power generation P FCMAX The condition (9) is that the number of SB charge / discharge times N COUNT is the number of times SB is allowed N UNIT The above is the FC operating time T COUNT is the FC allowable time T UNIT or more, and the power P L is the generated power P PV The condition (10) is that the number of SB charge / discharge times N COUNT is the number of times SB is allowed N UNIT The above is the FC operating time T COUNT is the FC allowable time T UNIT or more, and the power P L is the generated power P PV The condition is that it is greater than .

[0077] Under condition (1), the storage battery module 31 is in a charging state, and power flows from the electrical circuit 70 to the storage battery module 31. The fuel cell stack 21 is in a stopped state, and no power flows between the fuel cell stack 21 and the electrical circuit 70. No power flows from the commercial power source 2 to the electrical circuit 70.

[0078] In addition, even under the condition (1), if the storage battery module 31 is fully charged, the storage battery module 31 is in a standby state, and no power flows between the storage battery module 31 and the electric circuit 70. L A part or all of the excess power may be supplied to the commercial power source 2.

[0079] Under condition (2), the storage battery module 31 is in a discharging state, and power flows from the storage battery module 31 to the electrical circuit 70. The fuel cell stack 21 is in a power generating state, and power flows from the fuel cell stack 21 to the electrical circuit 70. No power flows from the commercial power source 2 to the electrical circuit 70.

[0080] Specifically, under the condition (2), the power P L The stable component of the power shortage that cannot be met is mainly met by the fuel cell stack 21. The variable component of this power shortage is met by the storage battery module 31. Typically, most of the power shortage (e.g., 80% or more) is met by the fuel cell stack 21.

[0081] Under condition (3), the storage battery module 31 is in a discharging state, and power flows from the storage battery module 31 to the electrical circuit 70. The fuel cell stack 21 is in a power generating state, and power flows from the fuel cell stack 21 to the electrical circuit 70. No power flows from the commercial power source 2 to the electrical circuit 70.

[0082] Specifically, under condition (3), the fuel cell stack 21 is in a state where it is exerting its power generation capacity to the maximum, and power flows from the fuel cell stack 21 to the electric circuit 70. Nevertheless, under condition (3), the power P LThe shortage of power that cannot be covered is covered by the storage battery module 31. Note that, even under condition (3), when the charge amount of the storage battery module 31 is zero, power does not flow between the storage battery module 31 and the electric circuit 70, but power flows from the commercial power source 2 to the electric circuit 70. In other words, power is purchased from the commercial power source 2 to the power supply system 1a.

[0083] Under condition (4), the storage battery module 31 is in a charging state, and power flows from the electrical circuit 70 to the storage battery module 31. The fuel cell stack 21 is in a stopped state, and no power flows between the fuel cell stack 21 and the electrical circuit 70. No power flows from the commercial power source 2 to the electrical circuit 70.

[0084] In addition, even in the condition (4), if the storage battery module 31 is fully charged, the storage battery module 31 is in a standby state, and no power flows between the storage battery module 31 and the electric circuit 70. L A part or all of the excess power may be supplied to the commercial power source 2.

[0085] Under condition (5), the storage battery module 31 is in a discharging state, and power flows from the storage battery module 31 to the electrical circuit 70. The fuel cell stack 21 is in a stopped state, and no power flows between the fuel cell stack 21 and the electrical circuit 70. No power flows from the commercial power source 2 to the electrical circuit 70.

[0086] Note that, even under condition (5), when the charge amount of the storage battery module 31 is zero, power does not flow between the storage battery module 31 and the electric circuit 70, but power flows from the commercial power source 2 to the electric circuit 70. In other words, power is purchased from the commercial power source 2 to the power supply system 1a.

[0087] Under condition (6), the storage battery module 31 is in a standby state, and no power flows between the storage battery module 31 and the electrical circuit 70. The fuel cell stack 21 is in a stopped state, and no power flows between the fuel cell stack 21 and the electrical circuit 70. No power flows from the commercial power source 2 to the electrical circuit 70.

[0088] In the condition (6), the power PL A part or all of the excess power may be supplied to the commercial power source 2.

[0089] Under condition (7), the storage battery module 31 is in a standby state, and no power flows between the storage battery module 31 and the electrical circuit 70. The fuel cell stack 21 is in a power generating state, and power flows from the fuel cell stack 21 to the electrical circuit 70. Power flows from the commercial power source 2 to the electrical circuit 70. In other words, power is purchased from the commercial power source 2 to the power supply system 1a.

[0090] Specifically, under the condition (7), the power P L The stable component of the power shortage that cannot be met is mainly met by the fuel cell stack 21. The variable component of this power shortage is met by the commercial power source 2. Typically, most of the power shortage (e.g., 80% or more) is met by the fuel cell stack 21.

[0091] Under condition (8), the storage battery module 31 is in a standby state, and no power flows between the storage battery module 31 and the electrical circuit 70. The fuel cell stack 21 is in a power generating state, and power flows from the fuel cell stack 21 to the electrical circuit 70. Power flows from the commercial power source 2 to the electrical circuit 70. In other words, power is purchased from the commercial power source 2 to the power supply system 1a.

[0092] Specifically, under condition (8), the fuel cell stack 21 is in a state where it is exerting its power generation capacity to the maximum, and power flows from the fuel cell stack 21 to the electric circuit 70. Nevertheless, under condition (8), the power P L The shortage of power that cannot be covered is covered by commercial power supply 2.

[0093] Under condition (9), the storage battery module 31 is in a standby state, and no power flows between the storage battery module 31 and the electrical circuit 70. The fuel cell stack 21 is in a stopped state, and no power flows between the fuel cell stack 21 and the electrical circuit 70. No power flows from the commercial power source 2 to the electrical circuit 70.

[0094] In the condition (9), the power P L A part or all of the excess power may be supplied to the commercial power source 2.

[0095] Under condition (10), the storage battery module 31 is in a standby state, and power does not flow between the storage battery module 31 and the electrical circuit 70. The fuel cell stack 21 is in a stopped state, and power does not flow between the fuel cell stack 21 and the electrical circuit 70. Power flows from the commercial power source 2 to the electrical circuit 70. In other words, power is purchased from the commercial power source 2 to the power supply system 1a.

[0096] FIG. 5 is a table for explaining the first information displayed on the first terminal 55 according to the first to third specific examples of the embodiment.

[0097] In the first to third specific examples shown in FIG. 5, the first information displayed on the first terminal 55 is displayed at timing t NEXT , timing t PRE , maintenance interval p M , SB allowable number of times N TOTAL , SB allowable number of times N UNIT , FC allowable time T TOTAL , FC allowable time T UNIT , FC power generation amount E FC and purchased electricity amount E BUY As mentioned above, in the embodiment, the timing t NEXT is the timing of the next maintenance of the power supply system 1a, as presented by the user 56. Timing t PRE is the timing of the previous maintenance of the power supply system 1a. TOTAL is the maintenance interval p M The upper limit of the number of times that the storage battery module 31 can be charged and discharged in the above-mentioned period. UNIT is the unit time p UNIT The upper limit of the number of times the storage battery module 31 can be charged and discharged in the FC allowable time T TOTAL is the maintenance interval p M The upper limit of the operation time of the fuel cell stack 21 in the FC allowable time T UNIT is the unit time p UNITThe upper limit of the operation time of the fuel cell stack 21 in the above-mentioned period. FC is the unit time p UNIT is a predicted value of the amount of power generated by the fuel cell stack 21 during the FC allowable time T UNIT The amount of purchased power E is a predicted value calculated based on the BUY is the unit time p UNIT is a predicted value of the power flowing from the commercial power source 2 to the power supply system 1a, and is the FC generated power amount E FC This is a predicted value calculated based on

[0098] In the first to third specific examples shown in FIG. 5, the unit time p UNIT is one day. The rated power generation P of the fuel cell stack 21 R The timing of the last maintenance t PRE is June 1, 2023. SB allowable number of times N TOTAL is 500 times. TOTAL is 1100 hours.

[0099] In the first specific example, timing t NEXT is December 1, 2023. Maintenance interval p M is 6 months. UNIT The FC allowable time T UNIT is 6 hours / day. FC generated power amount E FC The amount of purchased electricity E is 600 kWh / day. BUY is 75 kWh / day.

[0100] In the second specific example, timing t NEXT is June 1, 2024. Maintenance interval p M is one year. UNIT The FC allowable time T UNIT is 3 hours / day. FC generated power amount E FC The amount of purchased electricity E is 300 kWh / day. BUY is 30 kWh / day.

[0101] In the third specific example, timing t NEXTis June 1, 2025. Maintenance interval p M is 2 years. UNIT is 0.7 times / day. UNIT is 1.5 hours / day. FC generated power amount E FC The amount of purchased electricity E is 150 kWh / day. BUY is 60 kWh / day.

[0102] As can be seen from the first to third specific examples, the timing t NEXT The slower the FC allowable time T UNIT The timing t NEXT The slower the number of SB allowances N UNIT There will be less.

[0103] The following describes techniques that can be applied to the above-described embodiments.

[0104] In the example according to the sequence diagram of FIG. 3 of the embodiment described above, as can be seen from step S204, the power supply system 1a is operated in a manner that the storage battery module 31 is operated in a unit time p UNIT SB charge / discharge count N COUNT , and the unit time p of the fuel cell stack 21 UNIT FC operating time T COUNT The same applies to the specific example of the embodiment shown in FIG.

[0105] However, the number of SB charge / discharge times N COUNT and FC operating time T COUNT Of these, the number of SB charge / discharge times N COUNT The power supply system 1a may be controlled based only on the number of SB charge / discharge times N COUNT and FC operating time T COUNT Of these, FC operation time T COUNT The power supply system 1a may be controlled based only on the above.

[0106] In addition, the power supply system 1a is configured to perform maintenance on the storage battery module 31 at intervals p M In this case, the control may be based on the number of times of charging and discharging in the unit time p UNIT "Number of charge / discharge cycles in" or "Number of charge / discharge cycles in SBCOUNT " to "maintenance interval p M "Number of charge / discharge cycles in" and "SB allowable cycles N UNIT " to "SB Allowable Number of Times N TOTAL " can be read as ".

[0107] Furthermore, the power supply system 1a is configured to perform maintenance on the fuel cell stack 21 at maintenance intervals p M In this case, the control may be performed based on the operation time of the fuel cell stack 21 in the unit time p UNIT "Operating time in" or "FC operating time T COUNT " to "the maintenance interval p M "Operating time in" and "FC allowable time T UNIT " to "FC Allowable Time T TOTAL " can be read as ".

[0108] In step S101 of FIG. 2 in the above embodiment, the schedule information is NEXT In another example, the schedule information includes a timing t NEXT The other information includes other information from which the maintenance interval p M In this configuration example, the EMS server 52 sets the maintenance interval p M and timing t PRE Based on this, timing t NEXT can be calculated.

[0109] Regarding step S101 in FIG. 2 of the above-described embodiment, typically, at timing t NEXT is input by the user 56 to the first terminal 55. In this input, an input range may be set in the first terminal 55. For example, at the timing t PRE The timing when it is too close or too far from the NEXT It is possible to employ a configuration in which inputting as

[0110] The order of the steps in the sequence diagrams of Figures 2 and 3 can be changed as appropriate. For example, the order of steps S103 and S104 can be set arbitrarily. For example, the order of steps S205, S207, and S209 can be set arbitrarily. Furthermore, the order of steps S211, S212, and S213 can be set arbitrarily.

[0111] In the above-described embodiment, the number of photovoltaic power generation facilities is one. However, the number of photovoltaic power generation facilities may be two or more.

[0112] In the above-described embodiment, the number of fuel cell facilities is one. However, the number of fuel cell facilities may be two or more.

[0113] In the above-described embodiment, the number of storage battery facilities is one. However, the number of storage battery facilities may be two or more.

[0114] In the above-described embodiment, the number of photovoltaic power generation modules in one photovoltaic power generation facility is 1. However, the number of photovoltaic power generation modules in one photovoltaic power generation facility may be two or more.

[0115] In the above-described embodiment, the number of fuel cell stacks in one fuel cell facility is 1. However, the number of fuel cell stacks in one fuel cell facility may be two or more.

[0116] In the above-described embodiment, the number of storage battery modules in one storage battery facility is 1. However, the number of storage battery modules in one storage battery facility may be two or more.

[0117] In the above description of the embodiment, power losses such as conversion losses in the DC-DC converter and DC-AC inverter are ignored. It is also possible to perform control taking power losses into consideration.

[0118] [1-3. Effects, etc.] A power supply system 1a according to an example of the present disclosure includes a solar power generation device, a storage battery device, a fuel cell device, and a control device 50a. The control device 50a controls the solar power generation device, the storage battery device, and the fuel cell device. The control device 50a controls at least one device selected from the group consisting of the storage battery device and the fuel cell device at the timing t of the next maintenance of the power supply system 1a. NEXT This configuration is performed under the constraints according to the next maintenance timing t NEXT The solar power generation system is, for example, a solar power generation module 11. The storage battery system is, for example, a storage battery module 31. The fuel cell system is, for example, a fuel cell stack 21.

[0119] "The next maintenance timing t of the power supply system 1a NEXT This expression is used when the schedule information is set to the timing t NEXT This expression is intended to include the case where the schedule information includes the maintenance interval p M maintenance interval p M Based on the timing t NEXT is calculated.

[0120] A server according to an example of the present disclosure communicates with the power supply system 1 a. The server determines the timing t of the next maintenance of the power supply system 1 a. NEXT The server determines a constraint to be imposed on the operation of at least one device selected from the group consisting of a storage battery device and a fuel cell device, depending on the constraint. The server is, for example, an EMS server 52.

[0121] A management system 59 according to an example of the present disclosure manages the power supply system 1a. The management system 59 includes a server, a first terminal 55, and a second terminal 57. The first terminal 55 transmits schedule information to the server. The server determines the timing t of the next maintenance of the power supply system 1a. NEXT and the timing t based on the schedule information NEXT The server determines a constraint to be imposed on the operation of at least one device selected from the group consisting of a storage battery device and a fuel cell device, depending on the constraint. After determining the constraint, the server transmits first information regarding the operation of the power supply system 1a to the first terminal 55. The first terminal 55 transmits a first response to the transmission of the first signal to the server. After receiving the first response from the first terminal 55, the server transmits a first response to the transmission of the first signal at timing t NEXT The second terminal 57 transmits second information including the second signal to the server. The second terminal 57 transmits a second response to the transmission of the second signal to the server. After receiving the second response, the server transmits an operation instruction signal to the power supply system 1a to operate at least one device under the constraint.

[0122] The method for operating the power supply system 1 a according to the example of the present disclosure is to determine the timing t of the next maintenance of the power supply system 1 a. NEXT The operation method includes operating at least one device selected from the group consisting of a storage battery device and a fuel cell device under the constraint.

[0123] In one example of the present disclosure, both the storage battery system and the fuel cell system are operated under constraints. This configuration allows the maintenance of the storage battery system and the fuel cell system to be synchronized, which can reduce the cost and labor required for maintenance.

[0124] In one example of the present disclosure, the at least one device includes a fuel cell device, and the constraint includes an upper limit on the operating time of the fuel cell device. This configuration is configured to determine the timing t of the next maintenance of the power supply system 1a. NEXT In accordance with the above, it is suitable for ensuring the reliability of the fuel cell device while allowing the fuel cell device to demonstrate its capabilities.

[0125] The expression "upper limit of the operation time of the fuel cell device" will be explained. This expression means the timing of the next maintenance t NEXT The upper limit of the operation time of the fuel cell device up to the unit time p UNIT This expression is intended to encompass both the upper limit of the operating time of the fuel cell device per unit time.

[0126] In one example of the present disclosure, the at least one device includes a storage battery device. The constraint includes an upper limit on the number of times the storage battery device can be charged and discharged. This configuration is also useful for determining the timing t of the next maintenance of the power supply system 1a. NEXT This is suitable for ensuring the reliability of the storage battery device while allowing the storage battery device to demonstrate its capabilities.

[0127] The expression "upper limit of the number of times of charging and discharging the battery device" will be explained. This expression means the timing of the next maintenance t NEXT The upper limit of the number of times the storage battery device is charged and discharged up to the unit time p UNIT This expression is intended to encompass both the upper limit of the number of times a storage battery device can be charged and discharged per unit time.

[0128] In one example of the present disclosure, the server NEXT Determine the constraints based on

[0129] In one example of the present disclosure, the at least one device includes a fuel cell device. UNIT The server includes an upper limit of the operation time of the fuel cell device per timing t NEXT The upper limit is determined so that the slower the

[0130] In one example of the present disclosure, the at least one device includes a battery device. UNIT The server includes an upper limit of the number of times the storage battery device is charged and discharged per timing t NEXT The upper limit is determined so that the slower the

[0131] In one example of the present disclosure, after determining the constraint, the server transmits a first signal to the first terminal 55 to cause the first terminal 55 to display first information related to the operation of the power supply system 1a. According to this configuration, the person checking the display on the first terminal 55 can determine whether the first information is appropriate. Therefore, if the checker cannot accept the first information, the server can check the first information at another timing t NEXT The person who checks the information may be the user 56, for example.

[0132] In one example of the present disclosure, at least one selected from the group consisting of the following configurations (a) and (b) is established. In configuration (a), the at least one device includes a fuel cell device, the constraints include an upper limit on the operating time of the fuel cell device, and the first information includes a calculated value of the amount of power generated by the fuel cell device. In configuration (b), the at least one device includes a fuel cell device, the constraints include an upper limit on the operating time of the fuel cell device, and the first information includes a calculated value of the amount of power purchased from the commercial power source 2 to the power supply system 1a.

[0133] In one example of the present disclosure, the server receives schedule information from the first terminal 55 before transmitting the first signal. NEXT is based on schedule information.

[0134] "Timing t NEXT The expression "is based on schedule information" is explained below. NEXT This expression is intended to encompass the case where the schedule information includes a maintenance interval p M maintenance interval p M Based on the timing t NEXT is calculated.

[0135] In an example of the present disclosure, the server transmits an operation instruction signal to the power supply system 1a after receiving a first response to the transmission of the first signal from the first terminal 55. The operation instruction signal is a signal for operating at least one device under a constraint.

[0136] In one example of the present disclosure, after receiving the first response from the first terminal 55, the server NEXT The server transmits a second signal to the second terminal 57 to display second information including the second information on the second terminal 57. After receiving a second response to the transmission of the second signal from the second terminal 57, the server transmits an operation instruction signal to the power supply system 1a.

[0137] In one example of the present disclosure, the server receives schedule information from the first terminal 55 before transmitting the first signal. NEXT is based on the schedule information. The second information is the timing t NEXT The information includes information indicating that the request has been submitted by a user of the power supply system 1a.

[0138] A control method for a power supply system 1 a according to an example of the present disclosure includes: controlling at least one device selected from a group consisting of a storage battery device and a fuel cell device at a timing t NEXTThe program according to an example of the present disclosure includes instructions that, when executed by a processor, cause the processor to execute the control method. A recording medium according to an example of the present disclosure is a computer-readable recording medium having the program recorded thereon. In one example, the control method is executed by the power supply system 1a, and in one specific example, by the control device 50a. In one example, the program is implemented in the power supply system 1a, and in one specific example, in the control device 50a. The processor is, for example, a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), etc. The recording medium is, for example, a semiconductor recording medium, a magnetic recording medium, a magneto-optical recording medium, an optical recording medium, etc. The semiconductor recording medium is, for example, a secure digital (SD) card, a universal serial bus (USB) memory, a solid state drive (SSD), etc. The magnetic recording medium is, for example, a hard disk drive (HDD), a flexible disk, etc. The magneto-optical recording medium is, for example, a magneto-optical disk (MO), etc. Examples of optical recording media include CDs (Compact Discs) and DVDs (Digital Versatile Discs).

[0139] The constraint determination method for the power supply system 1 a according to the example of the present disclosure is a method for determining the next maintenance timing t NEXTand determining a constraint to be imposed on the operation of at least one device selected from the group consisting of a storage battery device and a fuel cell device, in accordance with the constraint. A program according to an example of the present disclosure includes instructions that, when executed by a processor, cause the processor to execute the constraint determination method. A recording medium according to an example of the present disclosure is a computer-readable recording medium having the program recorded thereon. The constraint determination method is executed by, for example, a server. The program is implemented in, for example, the server. The processor is, for example, a CPU, an ASIC, an FPGA, etc. The recording medium is, for example, a semiconductor recording medium, a magnetic recording medium, a magneto-optical recording medium, an optical recording medium, etc. The semiconductor recording medium is, for example, an SD card, a USB memory, an SSD, etc. The magnetic recording medium is, for example, an HDD, a flexible disk, etc. The magneto-optical recording medium is, for example, an MO, etc. The optical recording medium is, for example, a CD, a DVD, etc.

[0140] Unless there is a particular contradiction, the configurations of the power supply system 1a, the server, the management system 59, the operation method, the control method, and the constraint determination method are mutually applicable unless there is a particular contradiction.

[0141] The control method according to the present disclosure can be executed in a factory, etc. The power supply system according to the present disclosure can be installed in a factory, etc.

Claims

1. A method for operating an electric power supply system equipped with a storage battery device and a fuel cell device, the method including operating at least one device selected from the group consisting of the storage battery device and the fuel cell device under constraints according to the timing of the next maintenance of the electric power supply system.

2. The operating method according to claim 1, wherein the at least one device includes the fuel cell device, and the constraint includes an upper limit on the operating time of the fuel cell device.

3. The operating method according to claim 1 or 2, wherein the at least one device includes the storage battery device, and the constraint includes an upper limit on the number of times the storage battery device can be charged and discharged.

4. The operating method according to claim 1, further comprising determining the constraint based on the timing.

5. The operation method according to claim 4, wherein the at least one device includes the fuel cell device, the constraint includes an upper limit on the operating time of the fuel cell device per unit time, and the operation method includes determining the upper limit on the operating time such that the later the timing is, the shorter the upper limit on the operating time is.

6. The operation method described in claim 4 or 5, wherein the at least one device includes the storage battery device, the constraint includes an upper limit on the number of times the storage battery device is charged and discharged per unit time, and the operation method includes determining the upper limit on the number of times the storage battery device is charged and discharged such that the later the timing is, the lower the upper limit on the number of times the storage battery device is charged and discharged.

7. An operation method according to any one of claims 1 to 6, comprising: a server determining the constraint; and, after determining the constraint, transmitting a first signal to the first terminal for causing the first terminal to display first information regarding the operation of the power supply system.

8. The operating method according to claim 7, wherein at least one selected from the group consisting of the following (a) and (b) is established: (a) the at least one device includes the fuel cell device, the constraints include an upper limit on the operation time of the fuel cell device, and the first information includes a calculated value of the amount of power generated by the fuel cell device; (b) the power supply system is equipped with a photovoltaic power generation device, the at least one device includes the fuel cell device, the constraints include an upper limit on the operation time of the fuel cell device, and the first information includes a calculated value of the amount of power purchased from a commercial power source to the power supply system.

9. The operation method according to claim 7 or 8, further comprising the server receiving schedule information from the first terminal before transmitting the first signal, and the timing is based on the schedule information.

10. The operation method according to any one of claims 7 to 9, further comprising the step of: after the server receives a first response from the first terminal to the transmission of the first signal, transmitting an operation instruction signal to the power supply system for operating the at least one device under the constraint.

11. The operating method according to claim 10, further comprising the steps of: after receiving the first response from the first terminal, the server transmitting a second signal for causing a second terminal to display second information including the timing; and after receiving a second response to the transmission of the second signal from the second terminal, the server transmitting the operation instruction signal to the power supply system.

12. The operation method described in claim 11, wherein the server receives schedule information from the first terminal before transmitting the first signal, the timing is based on the schedule information, and the second information includes information indicating that the timing has been presented by a user of the power supply system.

13. A program having instructions which, when executed by a processor, cause the processor to execute a control method for a power supply system, the power supply system comprising a storage battery device and a fuel cell device, the control method including operating at least one device selected from the group consisting of the storage battery device and the fuel cell device under constraints according to the timing of the next maintenance of the power supply system.

14. A computer-readable recording medium having recorded thereon a program having instructions which, when executed by a processor, cause the processor to execute a control method for a power supply system, wherein the power supply system comprises a storage battery device and a fuel cell device, and the control method includes operating at least one device selected from the group consisting of the storage battery device and the fuel cell device under constraints according to the timing of the next maintenance of the power supply system.

15. A power supply system comprising: a storage battery device; a fuel cell device; and a control device that controls the storage battery device and the fuel cell device, wherein the control device operates at least one device selected from the group consisting of the storage battery device and the fuel cell device under constraints according to the timing of the next maintenance of the power supply system.

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