Power supply system, server, and operation method

Abstract

According to the present invention, a first power supply is performed when an environmental index is equal to or less than a target value. A second power supply is performed when the environmental index is greater than the target value. In the first power supply, power is supplied from a fuel cell facility (20) to a power load (5) without supplying power from a commercial power supply (2) to the power load (5). In the second power supply, power is supplied from the commercial power supply (2) to the power load (5) without supplying power from the fuel cell facility (20) to the power load (5). Said environmental index is a renewable energy ratio in the power consumption of the power load (5) or a carbon dioxide reduction rate of a power supply system (1a).

Description

Power supply system, server and operation method

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

[0002] Patent Document 1 discloses a stand-alone distributed power source that includes a solar power generation system, a fuel cell system, and a storage battery. Patent Document 1 also describes that it provides a method for operating the fuel cell system with high power generation efficiency.

[0003] JP 2015-164380 A

[0004] The present disclosure provides a technology suitable for achieving economic efficiency while achieving the target environmental friendliness.

[0005] The present disclosure provides an operation method for a power supply system that includes a fuel cell equipment and is interconnected with a commercial power source to supply power to a power load, the operation method including: performing a first power supply when an environmental index is equal to or less than a target value; and performing a second power supply when the environmental index is greater than the target value; in the first power supply, power is supplied from the fuel cell equipment to the power load without being supplied from the commercial power source to the power load; and in the second power supply, power is supplied from the commercial power source to the power load without being supplied from the fuel cell equipment to the power load; and the environmental index is the renewable energy ratio in the power consumption of the power load or the carbon dioxide reduction rate by the power supply system.

[0006] In another aspect, the present disclosure provides a power supply system including a fuel cell equipment and capable of supplying power to a power load by connecting to a commercial power source, wherein a first power supply is performed when an environmental index is equal to or less than a target value, and a second power supply is performed when the environmental index is greater than the target value, wherein in the first power supply, power is supplied from the fuel cell equipment to the power load without being supplied from the commercial power source to the power load, and in the second power supply, power is supplied from the commercial power source to the power load without being supplied from the fuel cell equipment to the power load, and the environmental index is a renewable energy ratio in the power consumption of the power load or a carbon dioxide reduction rate by the power supply system.

[0007] In another aspect, the present disclosure provides a server that includes a fuel cell equipment and communicates with a power supply system that is connected to a commercial power source and can supply power to a power load, wherein the server determines a power supply source to supply power to the power load, and when an environmental index is equal to or less than a target value, the power supply source does not include the commercial power source but includes the fuel cell equipment, and when the environmental index is greater than the target value, the power supply source does not include the fuel cell equipment but includes the commercial power source, and the environmental index is the renewable energy ratio in the power consumption of the power load or the carbon dioxide reduction rate by the power supply system.

[0008] In another aspect, the present disclosure provides a server that includes a fuel cell facility and communicates with a power supply system that is connected to a commercial power source and can supply power to a power load, wherein the server transmits a signal to a terminal to cause the terminal to display a change over time in a representative value of an environmental index, the environmental index being the renewable energy ratio in the power consumption of the power load or the carbon dioxide reduction rate achieved by the power supply system, and the representative value being in accordance with a plurality of calculated values ​​of the environmental index.

[0009] The technology disclosed herein is suitable for achieving economic efficiency while achieving the desired environmental friendliness.

[0010] FIG. 1 is a configuration diagram of a power supply system in embodiment 1. FIG. 2 is a flowchart for explaining the operation of an EMS server in embodiment 1. FIG. 3 is a graph for explaining a representative value of a renewable energy ratio in embodiment 1. FIG. 4 is an explanatory diagram of first data displayed on a terminal in embodiment 1. FIG. 5 is an explanatory diagram of second data displayed on a terminal in embodiment 1. FIG. 6 is a flowchart for explaining the operation of an EMS server in embodiment 2. FIG. 7 is a graph for explaining a representative value of a carbon dioxide reduction rate in embodiment 2. FIG. 8 is an explanatory diagram of third data displayed on a terminal in embodiment 2. FIG. 9 is an explanatory diagram of fourth data displayed on a terminal in embodiment 2. FIG. 10 is a flowchart for explaining the operation of an EMS server in embodiment 3. FIG. 11 is a flowchart for explaining the operation of an EMS server in embodiment 4.

[0011] (Findings and the like that form the basis of the present disclosure) Consider a power supply system that includes a fuel cell facility and is capable of supplying power to a power load by connecting to a commercial power source. When this power supply system is used to supply power to the power load, there are two power supply sources: the fuel cell facility and the commercial power source.

[0012] The power supply source used to supply power to the power load can affect economic and environmental friendliness. If an electric power supply system is operated with emphasis on economic friendliness, environmental friendliness may be insufficient. If an electric power supply system is operated with emphasis on environmental friendliness, economic friendliness may be insufficient. In this way, economic friendliness and environmental friendliness can be in a trade-off relationship. Technology that enables users, managers, etc. of the electric power supply system to obtain desired environmental friendliness while also obtaining economic friendliness by operating the electric power supply system to obtain an appropriate level of environmental friendliness is worth adopting.

[0013] 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.

[0014] 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.

[0015] First Embodiment Hereinafter, a first embodiment will be described with reference to FIGS. 1 to 5. FIG.

[0016] 1 is a configuration diagram of a power supply system 1a in embodiment 1. 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, an EMS (Energy Management System) server 52, and a terminal 55 are connected to each other via a network 60.

[0017] The power supply system 1a is a distributed power supply system. The power supply system 1a includes a solar power generation system 10, a fuel cell system 20, a storage battery system 30, a control device 50a, an electrical circuit 70, a distribution board 4, current sensors 3a, 3b, 7b, 7c, 7d1, 7d2, and 7d3. In the first embodiment, the power supply system 1a is installed in a facility. Specifically, the facility is a factory. The current sensors 3a, 3b, 7b, 7c, 7d1, 7d2, and 7d3 are, for example, current transformers.

[0018] 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.

[0019] The fuel cell equipment 20 includes a fuel cell system 20a, a fuel cell system 20b, and a fuel cell system 20c. Each of the fuel cell system 20a, the fuel cell system 20b, and the fuel cell system 20c is, for example, a polymer electrolyte fuel cell (PEFC) system, a solid oxide fuel cell (SOFC) system, or the like.

[0020] The fuel cell system 20a includes a fuel cell stack 21a, a DCDC converter 22a, and a DC / AC inverter 23a. DC power generated by the fuel cell stack 21a is converted into DC power of a different voltage by the DCDC converter 22a. The converted DC power is then converted into AC power by the DC / AC inverter 23a. The AC power is supplied to an electric circuit 70.

[0021] The fuel cell system 20b includes a fuel cell stack 21b, a DCDC converter 22b, and a DC / AC inverter 23b. DC power generated by the fuel cell stack 21b is converted into DC power of a different voltage by the DCDC converter 22b. The converted DC power is then converted into AC power by the DC / AC inverter 23b. The AC power is supplied to an electric circuit 70.

[0022] The fuel cell system 20c includes a fuel cell stack 21c, a DCDC converter 22c, and a DC / AC inverter 23c. The DC power generated by the fuel cell stack 21c is converted into DC power of a different voltage by the DCDC converter 22c. The converted DC power is then converted into AC power by the DC / AC inverter 23c. The AC power is supplied to an electric circuit 70.

[0023] The battery equipment 30 includes a battery module 31a, a battery module 31b, a battery module 31c, a bidirectional DC-DC converter 32a, a bidirectional DC-DC converter 32b, a bidirectional DC-DC converter 32c, and a DC-AC inverter 33. The battery module 31a, the battery module 31b, and the battery module 31c are, for example, a lithium-ion battery module, a nickel-metal hydride battery module, a lead-acid battery module, or the like.

[0024] The power discharged from the storage battery module 31a is converted into DC power having a different voltage by the bidirectional DC-DC converter 32a. 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.

[0025] The AC power supplied from the electric circuit 70 to the DC-AC 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 32a. The converted DC power is used to charge the storage battery module 31a.

[0026] The power discharged from the storage battery module 31b is converted into DC power having a different voltage by the bidirectional DC-DC converter 32b. 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.

[0027] The AC power supplied from the electric circuit 70 to the DC-AC 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 32b. The converted DC power is used to charge the storage battery module 31b.

[0028] The power discharged from the storage battery module 31c is converted into DC power having a different voltage by the bidirectional DC-DC converter 32c. 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.

[0029] The AC power supplied from the electric circuit 70 to the DC-AC 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 32c. The converted DC power is used to charge the storage battery module 31c.

[0030] 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 detected value of the current sensor 3a is transmitted from the current sensor 3a to the control device 50a. By monitoring the current detected value of the current sensor 3a, the control device 50a can cause 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).

[0031] 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. The detected value of the current sensor 3b is transmitted from the current sensor 3b to the control device 50a.

[0032] In the first embodiment, the power load 5 is a power load in a facility. Specifically, the facility is a factory.

[0033] In the first embodiment, the control period of the storage battery equipment 30 is shorter than the control period of the fuel cell equipment 20. Therefore, the charge / discharge power P SB is the power generation P of the fuel cell equipment 20 FC Compared to the power consumption of power load 5, L Specifically, the control period of the storage battery equipment 30 is shorter than that of the fuel cell system 20a, shorter than that of the fuel cell system 20b, and shorter than that of the fuel cell system 20c. For example, the control period of the storage battery equipment 30 is 1 / 50 to 1 / 5 of the control period of the fuel cell equipment 20, the fuel cell system 20a, the fuel cell system 20b, and / or the fuel cell system 20c. Note that the charge / discharge power is either 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.

[0034] The current sensor 7b detects the current flowing between the storage battery equipment 30 and the electrical circuit 70. Specifically, the current sensor 7b detects the charge / discharge current of the storage battery equipment 30. The detected value of the current sensor 7b is transmitted from the current sensor 7b to the control device 50a. The charge / discharge current is a charge current or a discharge current. A positive charge / discharge current indicates a discharge current, and a negative absolute value of the charge / discharge current indicates a charge current.

[0035] The current sensor 7c detects a current flowing between the photovoltaic power generation facility 10 and the electric circuit 70. Specifically, the current sensor 7c detects a current generated by the photovoltaic power generation facility 10. The detected value of the current sensor 7c is transmitted from the current sensor 7c to the control device 50a.

[0036] The current sensor 7d1 detects the current flowing between the fuel cell system 20a and the electrical path 70. Specifically, the current sensor 7d1 detects the current generated by the fuel cell system 20a. The detected value of the current sensor 7d1 is transmitted from the current sensor 7d1 to the control device 50a.

[0037] The current sensor 7d2 detects the current flowing between the fuel cell system 20b and the electrical path 70. Specifically, the current sensor 7d2 detects the current generated by the fuel cell system 20b. The detected value of the current sensor 7d2 is transmitted from the current sensor 7d2 to the control device 50a.

[0038] The current sensor 7d3 detects the current flowing between the fuel cell system 20c and the electric circuit 70. Specifically, the current sensor 7d3 detects the current generated by the fuel cell system 20c. The detected value of the current sensor 7d3 is transmitted from the current sensor 7d3 to the control device 50a.

[0039] The voltage of the current path between the commercial power supply 2 and the electric circuit 70 takes a first value and can be considered to be known. The first value is, for example, 100 V or 200 V in effective value. The control device 50a calculates the power flowing from the commercial power supply 2 to the electric circuit 70, i.e., the purchased power P BUY can be calculated.

[0040] The voltage of the power load 5 takes a second value and can be considered to be known. The second value is, for example, 100 V or 200 V in effective value. The control device 50a calculates the power flowing from the electric path 70 to the power load 5, i.e., the power consumption P of the power load 5, from the second value and the detection value of the current sensor 3b. L can be calculated.

[0041] The voltage of the current path between the battery equipment 30 and the electric circuit 70 takes a third value and can be considered to be known. The third value is, for example, 100 V or 200 V in effective value. The control device 50a calculates the charge / discharge power P of the battery equipment 30 from the third value and the detection value of the current sensor 7b. SB can be calculated.

[0042] The voltage of the current path between the photovoltaic power generation facility 10 and the electric circuit 70 takes a fourth value and can be considered to be known. The fourth value is, for example, 100 V or 200 V in effective value. The control device 50a calculates the power generation power P of the photovoltaic power generation facility 10 from the fourth value and the detection value of the current sensor 7c. PV can be calculated.

[0043] The voltage of the current path between fuel cell system 20a and electrical circuit 70 can be considered to be known as a fifth value. The fifth value is, for example, 100 V or 200 V in effective value. The control device 50a can calculate the power generated by fuel cell system 20a from the fifth value and the detection value of current sensor 7d1. The voltage of the current path between fuel cell system 20b and electrical circuit 70 can be considered to be known as a sixth value. The sixth value is, for example, 100 V or 200 V in effective value. The control device 50a can calculate the power generated by fuel cell system 20b from the sixth value and the detection value of current sensor 7d2. The voltage of the current path between fuel cell system 20c and electrical circuit 70 can be considered to be known as a seventh value. The seventh value is, for example, 100 V or 200 V in effective value. The control device 50a can calculate the power generated by fuel cell system 20c from the seventh value and the detection value of current sensor 7d3. The control device 50a calculates the generated power P of the fuel cell equipment 20 by adding up these generated powers. FC can be calculated.

[0044] In the first embodiment, the control device 50a is an edge computer. The control device 50a has a gateway function. The EMS server 52 is a cloud server. The network 60 is a wireless network, specifically the Internet. The terminal 55 is used by a user, administrator, or the like of the power supply system 1a. The terminal 55 is, for example, a smartphone, a personal computer, a tablet, a mobile phone, a personal digital assistant (PDA), or the like.

[0045] The storage battery equipment 30 includes a control device 50b. The solar power generation equipment 10 includes a control device 50c. The fuel cell system 20a includes a control device 50d1. The fuel cell system 20b includes a control device 50d2. The fuel cell system 20c includes a control device 50d3.

[0046] The control device 50a communicates with the current sensor 3a, the current sensor 3b, the control device 50b, the control device 50c, the control device 50d1, the control device 50d2, and the control device 50d3. 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, the control device 50c, the control device 50d1, the control device 50d2, and the control device 50d3.

[0047] The control device 50b receives a control signal from the control device 50a. The control device 50b controls the bidirectional DC-DC converter 32a, the bidirectional DC-DC converter 32b, the bidirectional DC-DC converter 32c, and the DC-AC inverter 33 based on the control signal. By controlling the bidirectional DC-DC converter 32a, it is possible to control whether the storage battery module 31a is charged, in standby mode, or discharged. By controlling the bidirectional DC-DC converter 32b, it is possible to control whether the storage battery module 31b is charged, in standby mode, or discharged. By controlling the bidirectional DC-DC converter 32c, it is possible to control whether the storage battery module 31c is charged, in standby mode, or discharged. 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 electrical circuit 70 is controlled.

[0048] Specifically, the bidirectional DC-DC converter 32a is controlled to control the charge / discharge power of the storage battery module 31a, the bidirectional DC-DC converter 32b is controlled to control the charge / discharge power of the storage battery module 31b, and the bidirectional DC-DC converter 32c is controlled to control the charge / discharge power of the storage battery module 31c.

[0049] In the illustrated example, charging and discharging of the storage battery module 31a is controlled by controlling the inter-terminal voltage V1 of the bidirectional DC-DC converter 32a relative to the inter-terminal voltage V2 of the DC-AC inverter 33. Charging and discharging of the storage battery module 31b is controlled by controlling the inter-terminal voltage V1 of the bidirectional DC-DC converter 32b relative to the inter-terminal voltage V2 of the DC-AC inverter 33. Charging and discharging of the storage battery module 31c is controlled by controlling the inter-terminal voltage V1 of the bidirectional DC-DC converter 32c relative to the inter-terminal voltage V2 of the DC-AC inverter 33.

[0050] 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.

[0051] The control device 50d1 receives a control signal from the control device 50a. The control device 50d1 controls the DCDC converter 22a and the DC-AC inverter 23a based on the control signal. By controlling the DCDC converter 22a, the output voltage of the fuel cell stack 21a is adjusted. By controlling the DC-AC inverter 23a, power conversion between direct current and alternating current is performed. Through these controls, power is extracted from the fuel cell system 20a to the electrical circuit 70.

[0052] The control device 50d2 receives a control signal from the control device 50a. The control device 50d2 controls the DCDC converter 22b and the DC-AC inverter 23b based on the control signal. By controlling the DCDC converter 22b, the output voltage of the fuel cell stack 21b is adjusted. By controlling the DC-AC inverter 23b, power conversion between DC and AC is performed. Through these controls, power is extracted from the fuel cell system 20b to the electrical circuit 70.

[0053] The control device 50d3 receives a control signal from the control device 50a. The control device 50d3 controls the DCDC converter 22c and the DC-AC inverter 23c based on the control signal. By controlling the DCDC converter 22c, the output voltage of the fuel cell stack 21c is adjusted. By controlling the DC-AC inverter 23c, power conversion between DC and AC is performed. Through these controls, power is extracted from the fuel cell system 20c to the electrical circuit 70.

[0054] In the first embodiment, green hydrogen is used as fuel in the fuel cell equipment 20. Green hydrogen is hydrogen produced by electrolyzing water using renewable energy. Therefore, using the fuel cell equipment 20 to supply power to the power load 5 reduces the power consumption P L This can increase the proportion of electricity derived from renewable energy in the total electricity generated, which can also reduce carbon dioxide emissions resulting from power supply to the power load 5. Renewable energy is, for example, energy derived from solar, wind, geothermal, hydroelectric, biomass, etc.

[0055] In contrast, in the first embodiment, the commercial power source 2 includes a thermal power plant that generates electricity using fossil fuels such as oil and coal. The cost of generating electricity using fossil fuels is low. Therefore, using the commercial power source 2 to supply power to the power load 5 can reduce the cost required to supply power to the power load 5. However, when generating electricity using fossil fuels, carbon dioxide emissions cannot be avoided.

[0056] For these reasons, in the first embodiment, supplying power from the fuel cell equipment 20 to the power load 5 is more advantageous from the standpoint of improving environmental friendliness than supplying power from the commercial power source 2 to the power load 5. In contrast, supplying power from the commercial power source 2 to the power load 5 is more advantageous from the standpoint of improving economic efficiency than supplying power from the fuel cell equipment 20 to the power load 5.

[0057] [1-2. Operation] FIG. 2 is a flowchart for explaining the operation of the EMS server 52 in the first embodiment.

[0058] In step S101, the EMS server 52 initializes a counter value C to 0 (zero). As will be understood from the description below, the counter value C in step S113 is the renewable energy ratio RER recorded in the memory of the EMS server 52 in step S113. RE is the number of renewable energy ratios RER calculated in one control cycle in the flowchart of FIG. 2 RE Indicates whether it is.

[0059] Next, in step S102, the EMS server 52 increments the counter value C by one.

[0060] Next, in step S103, the EMS server 52 calculates the current power generation power P PV Specifically, the EMS server 52 acquires the generated power P PV is received from the control device 50a via the network 60.

[0061] Next, in step S104, the EMS server 52 calculates the current charge / discharge power P SB Specifically, the EMS server 52 acquires the charge / discharge power P SB is received from the control device 50a via the network 60.

[0062] Next, in step S105, the EMS server 52 calculates the current power consumption P L Specifically, the EMS server 52 acquires the power consumption P L is received from the control device 50a via the network 60.

[0063] Next, in step S106, the EMS server 52 calculates the current purchased power P from the commercial power source 2 to the power supply system 1a. BUY Specifically, the EMS server 52 acquires the purchased power P BUY is received from the control device 50a via the network 60.

[0064] Next, in step S107, the EMS server 52 calculates the power consumption P L From the above, the generated power P PV and charging / discharging power P SBThe power shortage ΔP is calculated by subtracting the total of X That is, the power shortage ΔP X is calculated by the following formula 1: Formula 1: ΔP X =P L -P PV -P SB

[0065] Next, in step S108, the EMS server 52 calculates the current renewable energy ratio RER RE Specifically, the renewable energy ratio RER is calculated as follows: RE is calculated by the following formula 2: RE = (P L -P BUY ) / P L

[0066] Next, in step S109, the EMS server 52 reads the target value RER from the memory of the EMS server 52. TA Read out the target value RER. TA is the renewable energy ratio (RER) RE is the target value to be followed. Specifically, the target value RER TA is transmitted from the terminal 55 to the EMS server 52 via the network 60.

[0067] Next, in step S110, the EMS server 52 calculates the renewable energy ratio RER RE is the target value RER TA Determine whether the renewable energy ratio (RER) is greater than the RE is the target value RER TA If the renewable energy ratio RER is greater than 0.001, the process proceeds to step S111. RE is the target value RER TA If it is equal to or less than this, the process proceeds to step S112.

[0068] In step S111, the EMS server 52 transmits a power purchase command to the control device 50a via the network 60. The power purchase command is a command to purchase power P from the commercial power source 2 to the power supply system 1a. BUY The power shortage ΔP X , while the generated power P of the fuel cell equipment 20 is FCThis is a command to set the value to 0. After step S111, the process proceeds to step S113.

[0069] When the control device 50a receives the power purchase command, the control device 50a controls the power supply system 1a in accordance with the power purchase command. Specifically, the control device 50a controls the power purchase P BUY is the power shortage ΔP X and the power generation power P of the fuel cell equipment 20 FC The power supply system 1a is controlled so that

[0070] In step S112, the EMS server 52 transmits an FC output command to the control device 50a via the network 60. The FC output command is FC The power shortage ΔP X While following the BUY This is a command to set the value to 0. After step S112, the process proceeds to step S113.

[0071] When the control device 50a receives the FC output command, it controls the power supply system 1a in accordance with the FC output command. FC is the power shortage ΔP X and the purchased power P BUY The power supply system 1a is controlled so that

[0072] In step S113, the EMS server 52 calculates the renewable energy ratio RER RE [C] is recorded in the memory of the EMS server 52. Renewable energy ratio RER RE [C] is the renewable energy ratio RER at the counter value C RE is.

[0073] Next, in step S114, the EMS server 52 determines whether the counter value C is equal to or greater than the reference value N. If the counter value C is equal to or greater than the reference value N, the process proceeds to step S115. If the counter value C is smaller than the reference value N, the process returns to step S102. The reference value N is a natural number equal to or greater than 2. The reference value N may also be a natural number equal to or greater than 5. In the first embodiment, the reference value N is 10.

[0074] When proceeding to step S115, the memory of the EMS server 52 stores the RER RE [1], R.E.R. RE [2],...RER RE [N-1] and RER RE [N] is recorded.

[0075] In step S115, the renewable energy ratio RER RE Representative value of RER TYP Obtain the representative value RER TYP The acquisition of will be described later with reference to FIG.

[0076] In the first embodiment, a control cycle including steps S101 to S115 shown in Fig. 2 is repeated. The control cycle is repeated at a predetermined control period. This control period is, for example, one month or less, and is one day in the first embodiment. In one control period, steps S102 to S113 are performed N times.

[0077] In the first embodiment, the greater the amount of solar radiation on the solar power generation facility 10, the greater the power generation power P PV Specifically, the control device 50a performs maximum power point tracking (MPPT) control of the photovoltaic power generation module 11 using the DC-DC converter 12. The control device 50a also controls the power consumption P L The charging and discharging power P of the battery equipment 30 is controlled to follow the fluctuation component of SB Control.

[0078] FIG. 3 shows the renewable energy ratio RER in the first embodiment. RE Representative value of RER TYP 3 is a graph for explaining the renewable energy ratio RER. In FIG. 3, the horizontal axis represents time, and the vertical axis represents the renewable energy ratio RER. RE is.

[0079] In Fig. 3, a double-headed arrow 75 representing a predetermined control period is drawn along the horizontal axis. N plots are plotted within the double-headed arrow 75 along the horizontal axis. The N plots are RER RE [1], R.E.R.RE [2],...RER RE [N-1] and RER RE In the example of FIG. 3, the control period is 1 day, and N=10.

[0080] In the first embodiment, the representative value RER TYP is RER RE [1], R.E.R. RE [2],...RER RE [N-1] and RER RE [N]. That is, the representative value RER TYP is calculated by the following formula 3: RER TYP = (RER RE [1] + RER RE [2]+...+RER RE [N-1] + RER RE [N]) / N

[0081] By accessing the EMS server 52 from the terminal 55 via the network 60, it is possible to display operational data related to the power supply system 1a on the terminal 55. Specifically, the EMS server 52 transmits a signal including the operational data and for displaying the operational data to the terminal 55 via the network 60. This enables the terminal 55 to display the operational data. In the first embodiment, the operational data includes first data and second data.

[0082] 4 is an explanatory diagram of the first data displayed on the terminal 55 in the first embodiment. In the example of FIG. 4, the first data includes: RE Representative value of RER TYP Changes over time in renewable energy ratio (RER) RE Target value RER TA In FIG. 4, the representative value RER TYP The change over time of RER is displayed in a graph format. In Fig. 4, the horizontal axis represents time, and the vertical axis represents the representative value RER. TYP In the graph of FIG. TYP The time-dependent change in RER includes multiple plots. Each plot represents the representative value RER obtained in step S115. TYPThe interval between multiple plots is equal to a predetermined control period, specifically, one day. In FIG. 4, the representative value RER from August 11 to August 20 is TYP In the example of FIG. 4, the target value RER TA is 80%.

[0083] 5 is an explanatory diagram of the second data displayed on the terminal 55 in the first embodiment. In the example of FIG. 5, the second data includes the generated power P of the photovoltaic power generation facility 10. PV Change over time in the charge / discharge power P of the battery equipment 30 SB The change over time in the power generated by the fuel cell equipment 20 P FC Change over time in power consumption P of power load 5 L Changes over time in renewable energy ratio (RER) RE Changes over time in renewable energy ratio (RER) RE Target value RER TA In FIG. 5, the changes over time are displayed in a graph format. In FIG. 5, the horizontal axis represents time, and the vertical axis represents electricity or renewable energy ratio RER. RE In the example of FIG. TA is 80%.

[0084] As can be seen from FIG. 4, the representative value RER TYP Since the average value RER is TYP The renewable energy ratio RER changes over time. RE This means that the variation in the calculated value of the renewable energy ratio RER can be reduced. RE is the target value RER TA This makes it easier to confirm that the system is following the

[0085] In the example of FIG. 5, the generated power P PV , charging / discharging power P SB , generated power P FC and power consumption P L The renewable energy ratio RER changes over time. RE Through such a display, a person who checks the display, such as a user or a manager of the power supply system 1a, can easily check the renewable energy ratio RER RE is the target value RERTA It can be conveyed that the power supply system 1a is controlled to follow the

[0086] Several other embodiments will be described below. In the following, elements common to the embodiments already described and the embodiments to be described thereafter will be given the same reference numerals, and their description may be omitted. The descriptions of the respective embodiments may be mutually applicable unless technically inconsistent. The respective embodiments may be combined with each other unless technically inconsistent.

[0087] Second Embodiment Hereinafter, a second embodiment will be described with reference to FIGS.

[0088] FIG. 6 is a flowchart for explaining the operation of the EMS server 52 in the second embodiment.

[0089] After step S103, in step S200, the EMS server 52 calculates the current power generation P FC Specifically, the EMS server 52 acquires the generated power P FC is received from the control device 50a via the network 60. After step S200, the process proceeds to step S104.

[0090] After step S107, in step S208, the EMS server 52 calculates the current carbon dioxide reduction rate COR RE Specifically, the EMS server 52 has a memory, and the memory has a database. In the database, the generated power P of the photovoltaic power generation facility 10 is calculated. PV and the carbon dioxide emissions CDE of the solar power generation facility 10 PV The power generation P of the fuel cell equipment 20 FC and the carbon dioxide emissions CDE of the fuel cell equipment 20 FC The charge / discharge power P of the battery equipment 30 SB and the carbon dioxide emissions CDE of the battery storage facility 30 SB The corresponding relationship between the power purchase power P from the commercial power source 2 to the power supply system 1a and the power supply system 1b. BUY and the carbon dioxide emissions CDE of commercial power source 2 BUYThe EMS server 52 records the correspondence between the generated power P PV , generated power P FC , charging / discharging power P SB and purchased power P BUY Based on the above database, the current carbon dioxide emissions COE RE In addition, the EMS server 52 calculates the power consumption P L Based on the database, the power consumption P L All of the above is purchased as electricity P BUY Temporary carbon dioxide emissions COE if covered by HYP Then, the EMS server 52 calculates the carbon dioxide emission COE RE and carbon dioxide emissions COE HYP Based on carbon dioxide emissions COE RE Specifically, the carbon dioxide reduction rate COR is calculated. RE is calculated by the following Equation 4 or Equation 5. Equation 4: COR RE = (COE HYP -COE RE ) / COE RE Formula 5: COR RE = (COE HYP -COE RE ) / COE HYP

[0091] Next, in step S209, the EMS server 52 reads the target value COR from the memory of the EMS server 52. TA Read out the target value COR TA is the carbon dioxide reduction rate (COR) RE is the target value to be followed. Specifically, the target value COR TA is transmitted from the terminal 55 to the EMS server 52 via the network 60.

[0092] Next, in step S210, the EMS server 52 calculates the carbon dioxide reduction rate COR RE is the target value COR TA Determine whether the carbon dioxide reduction rate (COR) is greater than RE is the target value COR TAIf the carbon dioxide reduction rate COR is greater than 0.001, the process proceeds to step S111. RE is the target value COR TA If it is equal to or less than this, the process proceeds to step S112.

[0093] After step S111 or step S112, the process proceeds to step S213.

[0094] In step S213, the EMS server 52 calculates the carbon dioxide reduction rate COR RE [C] is recorded in the memory of the EMS server 52. Carbon dioxide reduction rate COR RE [C] is the carbon dioxide reduction rate COR at the counter value C RE is.

[0095] Next, in step S214, the EMS server 52 determines whether the counter value C is equal to or greater than the reference value N. If the counter value C is equal to or greater than the reference value N, the process proceeds to step S215. If the counter value C is smaller than the reference value N, the process returns to step S102. The reference value N is a natural number equal to or greater than 2. The reference value N may also be a natural number equal to or greater than 5. In the second embodiment, the reference value N is 10.

[0096] When proceeding to step S215, the EMS server 52 stores the COR RE [1], COR RE [2],...COR RE [N-1] and COR RE [N] is recorded.

[0097] In step S215, the carbon dioxide reduction rate COR RE Representative value of COR TYP Obtain the representative value COR TYP The acquisition of will be described later with reference to FIG.

[0098] In the second embodiment, a control cycle including steps S101 to S215 shown in Fig. 7 is repeated. The control cycle is repeated at a predetermined control period. This control period is, for example, one month or less, and is one day in the first embodiment. In one control period, steps S102 to S213 are performed N times.

[0099] FIG. 7 shows the carbon dioxide reduction rate COR in the second embodiment. RE Representative value of COR TYP 7 is a graph for explaining the above. In FIG. 7, the horizontal axis represents time, and the vertical axis represents the carbon dioxide reduction rate (COR). RE is.

[0100] In Fig. 7, a double-headed arrow 75 representing a predetermined control period is drawn along the horizontal axis. N plots are plotted within the double-headed arrow 75 along the horizontal axis. The N plots are COR RE [1], COR RE [2],...COR RE [N-1] and COR RE Represents [N].

[0101] In the second embodiment, the representative value COR TYP is COR RE [1], COR RE [2],...COR RE [N-1] and COR RE [N]. That is, the representative value COR TYP is calculated by the following formula 6: COR TYP = (COR RE [1] + COR RE [2]+...+COR RE [N-1] + COR RE [N]) / N

[0102] By accessing the EMS server 52 from the terminal 55 via the network 60, it is possible to display operational data related to the power supply system 1a on the terminal 55. Specifically, the EMS server 52 transmits a signal including the operational data and for displaying the operational data to the terminal 55 via the network 60. This enables the terminal 55 to display the operational data. In the second embodiment, the operational data includes third data and fourth data.

[0103] 8 is an explanatory diagram of the third data displayed on the terminal 55 in the second embodiment. In the example of FIG. 8, the third data includes: RE Representative value of COR TYPChanges over time, and carbon dioxide reduction rate COR RE Target value COR TA In FIG. 8, the representative value COR TYP The change over time of the COR is displayed in a graph format. In FIG. 8, the horizontal axis represents time, and the vertical axis represents the representative value COR. TYP In the graph of FIG. TYP The time-dependent change in COR includes multiple plots. Each plot represents the representative value COR obtained in step S215. TYP The interval between the plots is equal to a predetermined control period, specifically, one day. In FIG. 8, the representative value COR from August 11 to August 20 is TYP In the example of FIG. 8, the target value COR TA is 80%.

[0104] 9 is an explanatory diagram of the fourth data displayed on the terminal 55 in the second embodiment. In the example of FIG. 9, the fourth data includes: the power generation power P of the photovoltaic power generation facility 10; PV Change over time in the charge / discharge power P of the battery equipment 30 SB The change over time in the power generated by the fuel cell equipment 20 P FC Change over time in power consumption P of power load 5 L Change over time in carbon dioxide reduction rate (COR) RE Changes over time, and the carbon dioxide reduction rate (COR) RE Target value COR TA In FIG. 9, the change over time is displayed in a graph format. In FIG. 9, the horizontal axis represents time, and the vertical axis represents the power or carbon dioxide reduction rate COR. RE In the example of FIG. TA is 80%.

[0105] As can be seen from FIG. 8, the representative value COR TYP Since it has been subjected to averaging processing, the representative value COR TYP The change over time in the carbon dioxide reduction rate COR RE This means that the variation in the calculated carbon dioxide reduction rate COR RE is the target value COR TA This makes it easier to confirm that the system is following the

[0106] In the example of FIG. 9, the generated power P PV , charging / discharging power P SB , generated power P FC and power consumption P L The carbon dioxide reduction rate COR RE Through such a display, a person who checks the display, such as a user of the power supply system 1a, can see the change in the carbon dioxide reduction rate COR RE is the target value COR TA It can be conveyed that the power supply system 1a is controlled to follow the

[0107] Third Embodiment In a third embodiment, the EMS server 52 controls the power supply system 1a through a forecast based on the weather at the location of the power supply system 1a. RE The power supply system 1a is controlled based on the above.

[0108] The memory of the EMS server 52 has a database. The database stores past information (hereinafter referred to as past information). The past information is information from a past period (hereinafter referred to as past period). The past information includes: a change over time in the amount of solar radiation at the location of the power supply system 1a; and the power generation power P of the photovoltaic power generation facility 10. PV Change over time in power consumption P of power load 5 L Specifically, the past information in the database includes the amount of solar radiation, the amount of generated power P PV and power consumption P L are linked to each other at each point in time. The past period is, for example, one year. The amount of solar radiation can be measured, for example, by a pyranometer.

[0109] FIG. 10 is a flowchart for explaining the operation of the EMS server 52 in the third embodiment.

[0110] After step S102, in step S301, the EMS server 52 obtains the following information: - a time-dependent change in the amount of solar radiation at the position of the power supply system 1a in the past information; - a time-dependent change in the amount of solar radiation at the position of the power supply system 1a in the past information; PVand the current amount of solar radiation at the position of the power supply system 1a. PV Specifically, the EMS server 52 compares the amount of solar radiation at each point in time in the time-dependent change in the amount of solar radiation in the past information with the current amount of solar radiation. In this way, the EMS server 52 identifies which amount of solar radiation at a point in time in the past corresponds to the current amount of solar radiation. Then, the EMS server 52 predicts the generated power P at that point in time in the past information. PV current power generation P PV Predict as follows.

[0111] Next, in step S302, the EMS server 52 calculates the power consumption P of the power load 5 in the past information. L Based on the time course of the current day, the current power consumption P L Specifically, the power consumption P L On days when the power consumption P L In the case where the facility is a factory, for example, the power consumption P L On weekdays, the power consumption P L In this way, the power consumption P L The EMS server 52 calculates the power consumption P L The EMS server 52 then determines which day in the pattern the current day corresponds to based on the change over time of the power consumption P L current power consumption P L Predict as follows.

[0112] Next, in step S303, the EMS server 52 calculates the predicted generated power P PV , and the predicted power consumption P L , based on which the specific power ΔP SP Specifically, the specific power ΔP SP is the power consumption P L Generated power P PV That is, the specific power ΔPSP is calculated by the following formula 7: Formula 7: ΔP SP =P L -P PV

[0113] Next, in step S304, the EMS server 52 calculates the specific power ΔP SP Based on this, the charge and discharge power P SB and power shortage ΔP X Specifically, this prediction is calculated so that the following formula 8 holds: Formula 8: ΔP SP =P SB +ΔP X In the third embodiment, the specific power ΔP SP Of these, the stable component is the power shortage ΔP X The fluctuation component is the charge / discharge power P SB The power supply system 1a is configured so that the specific power ΔP is supplied according to a predetermined algorithm configured to supply the stable component and the fluctuating component in this way. SP From charging and discharging power P SB and power shortage ΔP X is predicted.

[0114] Next, in step S305, the EMS server 52 calculates the generated power P FC and purchased power P BUY As in the first and second embodiments, in the third embodiment, the power shortage ΔP X is the power generation P of the fuel cell equipment 20 FC , and the purchased power P from the commercial power source 2 to the power supply system 1a BUY In the third embodiment, the EMS server 52 is provided with either the power shortage ΔP X is the generated power P FC Is it covered by the purchased power P BUY This determination is made based on the previous step S110. Specifically, in the previous step S110, it is determined whether the renewable energy ratio RER RE is the target value RER TA If it is determined that the power shortage ΔP X is the purchased power P BUYIt is judged that the purchased power P BUY is the power shortage ΔP X Equal to the generated power P FC is predicted to be zero. On the other hand, in the previous step S110, the renewable energy ratio RER RE is the target value RER TA If it is determined that the power shortage ΔP X is the generated power P FC It is judged that the generated power P FC is the power shortage ΔP X Equal to the purchased power P BUY is predicted to be zero.

[0115] In the above context, "the previous step S110" is an expression intended to include the most recent step S110 in which the counter value C is 1 less than the current value when the current counter value C is 2 or greater. Also, "the previous step S110" is an expression intended to include the most recent step S110 in which the counter value C is N when the current counter value C is 1.

[0116] In step S305 during the first execution of the control cycle of FIG. 10, the power shortage ΔP X is the generated power P FC Is it covered by the purchased power P BUY For example, when the control cycle of FIG. 10 is executed for the first time, the purchased power P BUY is set to zero, and the generated power P FC is set to a non-zero value, and the power shortage ΔP is set to a non-zero value in step S305 during the first execution. X is the generated power P FC Furthermore, for example, when the control cycle of FIG. 10 is executed for the first time, the purchased power P BUY is set to a non-zero value, and the generated power P FCis set to zero, and the power shortage ΔP X is the purchased power P BUY The same applies to step S405 in FIG.

[0117] After step S305, the process proceeds to step S108.

[0118] In the fourth embodiment, the EMS server 52 controls the power supply system 1a through a forecast based on the weather at the location of the power supply system 1a. RE The power supply system 1a is controlled based on the above.

[0119] FIG. 11 is a flowchart for explaining the operation of the EMS server 52 in the fourth embodiment.

[0120] After step S304, in step S405, the EMS server 52 FC and purchased power P BUY As in the first to third embodiments, in the fourth embodiment, the power shortage ΔP X is the power generation P of the fuel cell equipment 20 FC , and the purchased power P from the commercial power source 2 to the power supply system 1a BUY In the fourth embodiment, the EMS server 52 is configured to X is the generated power P FC Is it covered by the purchased power P BUY This determination is made based on the previous step S210. Specifically, in the previous step S210, it is determined whether the carbon dioxide reduction rate COR RE is the target value COR TA If it is determined that the power shortage ΔP X is the purchased power P BUY It is judged that the purchased power P BUY is the power shortage ΔP X Equal to the generated power P FCis predicted to be zero. On the other hand, in the previous step S210, the carbon dioxide reduction rate COR RE is the target value COR TA If it is determined that the power shortage ΔP X is the generated power P FC It is judged that the generated power P FC is the power shortage ΔP X Equal to the purchased power P BUY is predicted to be zero.

[0121] In the above context, "the previous step S210" is an expression intended to include the most recent step S210 in which the counter value C is 1 less than the current value when the current counter value C is 2 or greater. Also, "the previous step S210" is an expression intended to include the most recent step S210 in which the counter value C is N when the current counter value C is 1.

[0122] After step S305, the process proceeds to step S208.

[0123] Various modifications can be applied to the above-described embodiment.

[0124] In the above-described embodiment, the charge / discharge power P of the battery equipment 30 is calculated from the detected value of the current sensor 7b. SB In another example, the battery storage equipment 30 is provided with a power controller including a DC-AC inverter 33. The power controller is provided with a logger. The logger calculates the charge / discharge power P SB and transmits the detected value to the control device 50a.

[0125] In the above-described embodiment, the power generation power P of the photovoltaic power generation facility 10 is calculated from the detection value of the current sensor 7c. PV In another example, the solar power generation facility 10 is provided with a power controller including a DC-AC inverter 13. The power controller is provided with a logger. The logger calculates the generated power P PV and transmits the detected value to the control device 50a.

[0126] In the above-described embodiment, the generated power P of the fuel cell equipment 20 is calculated from the detected values ​​of the current sensors 7d1 to 7d3. FC In another example, a fuel cell system 20a is provided with a power controller including a DCAC inverter 23a. A logger is provided in the power controller. The logger detects the power generated by the fuel cell system 20a and transmits the detected value to the control device 50a. A fuel cell system 20b is provided with a power controller including a DCAC inverter 23b. A logger is provided in the power controller. The logger detects the power generated by the fuel cell system 20b and transmits the detected value to the control device 50a. A fuel cell system 20c is provided with a power controller including a DCAC inverter 23c. A logger is provided in the power controller. The logger detects the power generated by the fuel cell system 20c and transmits the detected value to the control device 50a. The control device 50a calculates the generated power P by adding up these detected values. FC Calculate.

[0127] In the above-described embodiment, as an example, the generated power P FC In this example, the generated power P FC However, this is advantageous in terms of improving the response of the control of the power generated by the fuel cell equipment 20. FC may be controlled by controlling the magnitude of the power generated by the fuel cell system during operation.

[0128] In the above-described embodiment, the representative value RER TYP is RER RE [1], R.E.R. RE [2],...RER RE [N-1] and RER RE [N] is the arithmetic mean of RER. RE [1], R.E.R. RE [2],...RER RE [N-1] and RER RE Based on [N], the representative value RER TYP There is no particular limitation on the method for determining the representative value RER.TYP is RER RE [1], R.E.R. RE [2],...RER RE [N-1] and RER RE It may be the geometric mean, median, or mode of [N].

[0129] In the above-described embodiment, the representative value COR TYP is COR RE [1], COR RE [2],...COR RE [N-1] and COR RE [N] is the arithmetic mean of RE [1], COR RE [2],...COR RE [N-1] and COR RE Based on [N], the representative value COR TYP There is no particular limitation on the method for determining the representative value COR. TYP is COR RE [1], COR RE [2],...COR RE [N-1] and COR RE It may be the geometric mean, median, or mode of [N].

[0130] In the above-described embodiment, the database is included in the memory of the EMS server 52. However, the database may be located outside the EMS server 52. For example, a configuration may be adopted in which the EMS server 52 accesses an external database via the network 60 and acquires information from the database.

[0131] In the above-described embodiment, the information shown in Figures 4, 5, 8 and 9 is displayed on the terminal 55. However, the information displayed on the terminal 55 is not particularly limited. For example, RE The change over time may be displayed.

[0132] In the above-described first and third embodiments, the first data and the second data are displayed on the terminal 55. In the above-described second and fourth embodiments, the third data and the fourth data are displayed on the terminal 55. The first data, the second data, the third data, and the fourth data may be displayed on the terminal 55.

[0133] In the above-described embodiment, the EMS server 52 is a cloud server. The network 60 is a wireless network, specifically the Internet. However, the EMS server 52 may be an on-premise server. The network 60 may also be a wired network.

[0134] In the embodiment described above, the control shown in the flowchart of Fig. 2 is performed by the EMS server 52. However, the control shown in the flowchart of Fig. 2 may also be performed by the control device 50a.

[0135] The order of the steps in the flowcharts of Figures 2, 6, 10 and 11 can be changed as appropriate. For example, the order of steps S103, S200, S104, S105 and S106 can be set arbitrarily.

[0136] In the above-described embodiment, the number of photovoltaic power generation modules in the photovoltaic power generation facility 10 is one. However, the number of photovoltaic power generation modules may be two, three, four or more.

[0137] In the above-described embodiment, the number of fuel cell systems in the fuel cell equipment 20 is three. However, the number of fuel cell systems may be one, two, four or more. The number of fuel cell systems may be ten or more, or even fifty or more.

[0138] In the above-described embodiment, the number of storage battery modules in the storage battery equipment 30 is three. However, the number of storage battery modules may be one, two, four or more.

[0139] 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.

[0140] [1-3. Effects, etc.] A power supply system 1a according to an example of the present disclosure includes a solar power generation facility 10, a storage battery facility 30, a fuel cell facility 20, and a control device 50a. The control device 50a controls the solar power generation facility 10, the storage battery facility 30, and the fuel cell facility 20. The power supply system 1a is interconnected with a commercial power source 2 and is capable of supplying power to a power load 5. The power supply system 1a communicates with a server. The server is, for example, an EMS server 52.

[0141] In one example of the present disclosure, the control device 50a realizes the first power supply when the environmental index is equal to or less than the environmental target value. The control device 50a realizes the second power supply when the environmental index is greater than the environmental target value. In the first power supply, power is supplied from the fuel cell equipment 20 to the power load 5 without being supplied from the commercial power source 2 to the power load 5. In the second power supply, power is supplied from the commercial power source 2 to the power load 5 without being supplied from the fuel cell equipment 20 to the power load 5. The environmental index is calculated based on the power consumption P L Renewable energy ratio (RER) RE or the carbon dioxide reduction rate COR by the power supply system 1a RE This configuration is suitable for achieving the target environmental friendliness while also achieving economic efficiency.

[0142] In the above configuration, the environmental indicator is the renewable energy ratio RER. RE In this case, the environmental target value is, for example, the target value RER TA Renewable energy ratio (RER) RE and target value RER TA The environmental index may be the one shown in FIG. 2 for the first embodiment, or may be the one shown in FIG. 10 for the third embodiment. RE In this case, the environmental target value is, for example, the target value COR TA Carbon dioxide reduction rate (COR) RE and target value COR TAmay be as shown in FIG. 6 for the second embodiment, or as shown in FIG. 11 for the fourth embodiment.

[0143] In one example of the present disclosure, the first power supply has a power consumption P L is the power generation power P of the solar power generation facility 10 PV and the charge / discharge power P of the battery equipment 30 SB The second power supply is performed when the power consumption P L is the power generation power P of the solar power generation facility 10 PV and the charge / discharge power P of the battery equipment 30 SB is greater than the sum of

[0144] In one example of the present disclosure, the first power supply has a power consumption P L is the power generation power P of the solar power generation facility 10 PV This is executed when the power consumption P L The second power supply is the power generation power P of the solar power generation facility 10. PV is executed if it is greater than

[0145] In one example of the present disclosure, the period during which the first power supply is performed is equal to or longer than the power consumption P L and the power generation power P of the solar power generation facility 10 PV The period during which the second power supply is performed includes a period during which the fuel cell equipment 20 supplies power according to the power consumption P L and the power generation power P of the solar power generation facility 10 PV According to this configuration, the generated power P PV and the power consumption P according to the usage status of the power load 5 L Power can be supplied to the power load 5 from the fuel cell equipment 20 or the commercial power source 2 according to the fluctuations in the power consumption.

[0146] In one example of the present disclosure, the period during which the first power supply is performed is equal to or longer than the power consumption P L and the power generation power P of the solar power generation facility 10 PV and the charge / discharge power P of the battery equipment 30 SB The period during which the second power supply is performed includes a period during which the fuel cell equipment 20 supplies power according to the power consumption P L and the power generation power P of the solar power generation facility 10PV and the charge / discharge power P of the battery equipment 30 SB The period includes a period during which power according to the above is supplied from the commercial power source 2 to the power load 5.

[0147] In one example of the present disclosure, the period during which the first power supply is performed is equal to or longer than the power consumption P L and the power generation power P of the solar power generation facility 10 PV The fuel cell equipment 20 supplies power to the power load 5 according to the power consumption P L and the power generation power P of the solar power generation facility 10 PV The period during which the second power supply is performed includes a period during which the storage battery equipment 30 supplies power according to the power consumption P L and the power generation power P of the solar power generation facility 10 PV The power corresponding to the power consumption P is supplied from the commercial power source 2 to the power load 5. L and the power generation power P of the solar power generation facility 10 PV The period includes a period during which the storage battery equipment 30 supplies power according to the above to the power load 5.

[0148] In an example of the present disclosure, the control period of the storage battery equipment 30 is shorter than the control period of the fuel cell equipment 20. The period during which the first power supply is performed is determined by the power generation power P PV and the charge / discharge power P of the storage battery equipment 30 SB and the power generation P of the fuel cell equipment 20 FC The period during which the second power supply is performed includes a period during which the power according to the amount of solar radiation is supplied to the power load 5. PV and the charge / discharge power P of the storage battery equipment 30 SB and the purchased power P from the commercial power source 2 to the power supply system 1a. BUY According to this configuration, the power consumption P L The battery equipment 30 supplies a part or all of the relatively high frequency components in the power consumption P L The relatively low frequency components in the frequency band can be partially or entirely covered by the fuel cell equipment 20 or the commercial power supply 2. Specifically, during the period in which the first power supply is performed, the power generation power P PV and the charge / discharge power P of the storage battery equipment 30 SBand the power generation P of the fuel cell equipment 20 FC The period during which the second power supply is performed includes a period during which the total power of the above-mentioned two power supplies is supplied to the power load 5. ... PV and the charge / discharge power P of the storage battery equipment 30 SB and the purchased power P from the commercial power source 2 to the power supply system 1a. BUY and the total power of the power load 5 is supplied to the power load 5.

[0149] The high and low frequency components in the above configuration are exemplified in Figures 5 and 9. Specifically, in Figures 5 and 9, the power consumption P L The charge / discharge power P SB There is a period when the power consumption P L The generated power P FC There are periods when this fluctuates.

[0150] In one example of the present disclosure, the server determines the power supply source to supply power to the power load 5. When the environmental index is equal to or less than the environmental target value, the power supply source does not include the commercial power source 2 but includes the fuel cell equipment 20. When the environmental index is greater than the environmental target value, the power supply source does not include the fuel cell equipment 20 but includes the commercial power source 2. This configuration makes it possible to realize the first power supply and the second power supply described above.

[0151] In one example of the present disclosure, the server repeats a control cycle. The control cycle includes a first process and a second process. The first process is a process for obtaining a plurality of calculated values ​​by performing calculation of an environmental index a plurality of times. The second process is a process for calculating an environmental representative value according to the plurality of calculated values. With this configuration, an environmental representative value can be obtained in which the variation in the plurality of calculated values ​​of the environmental index is reduced. Such an environmental representative value is useful when evaluating environmental friendliness. When the environmental index is a renewable energy ratio RER, RE , the environmental representative value is, for example, the representative value RER TYP The environmental indicator is the carbon dioxide reduction rate (COR). RE In this case, the environmental representative value is, for example, the representative value COR TYP is.

[0152] In one example of the present disclosure, the server transmits a signal to the terminal 55 to cause the terminal 55 to display the change in the environmental representative value over time (hereinafter, referred to as the first display). The signal includes information representing the change in the environmental representative value over time. This configuration allows the change in the environmental representative value over time to be displayed on the terminal 55, allowing the user of the terminal 55 to check the change in the environmental representative value over time. This configuration is suitable for achieving economic efficiency while achieving the target environmental performance. This is because, if the environmental representative value deviates from an appropriate value, the user, manager, etc. of the power supply system 1a can be prompted to adjust the settings of the power supply system 1a. Specifically, the change in the environmental representative value over time is based on multiple environmental representative values ​​obtained by repeating the above-mentioned control cycle.

[0153] In one example of the present disclosure, the change over time of the environmental representative value is a graph in which the environmental representative value is arranged at intervals of one month or less. With this configuration, it is possible to check the environmental characteristics with a certain degree of frequency. The change over time of the environmental representative value may be a graph in which the environmental representative value is arranged at intervals of three days or less.

[0154] In one example of the present disclosure, the server transmits to the terminal 55 the generated power P of the solar power generation facility 10. PV and the charge / discharge power P of the battery equipment 30. SB and the power generation P of the fuel cell equipment 20. FC Changes over time and power consumption P L The power supply system 1a transmits a signal for displaying the time-dependent change in the power supply system 1a, the time-dependent change in the environmental index, and the time-dependent change in the power supply system 1a on the terminal 55 (hereinafter referred to as the second display). This configuration is suitable for achieving the target environmental performance while also achieving economic efficiency. This is because, if the environmental index deviates from the appropriate value, the user, manager, etc. of the power supply system 1a can be prompted to adjust the settings of the power supply system 1a. PV The change over time of the charging and discharging power P may be shown as a graph. SB The change over time of the generated power P may be shown as a graph. FC The change over time of the power consumption P may be shown as a graph. L The change over time of the environmental indicator may be shown in a graph. The change over time of the environmental indicator may be shown in a graph.

[0155] In one example of the present disclosure, the server receives an environmental target value from the terminal 55. With this configuration, the environmental target value can be set arbitrarily from the terminal 55. For example, a user of the terminal 55, such as a user or administrator of the power supply system 1a, sets the environmental target value from the terminal 55. This allows the power supply system 1a to be controlled so as to follow the environmental target value desired by the user or administrator. A configuration can be employed in which the user interface of the terminal 55 accepts input of the environmental target value when the first display described above is displayed on the terminal 55. A configuration can be employed in which the user interface of the terminal 55 accepts input of the environmental target value when the second display described above is displayed on the terminal 55. The user interface is, for example, a touch panel.

[0156] The present disclosure relates to an operation method of a power supply system 1 a, a control method of the power supply system 1 a, and a management method of the power supply system 1 a. The operation method according to an example of the present disclosure includes performing a first power supply when an environmental index is equal to or less than a target value, and performing a second power supply when the environmental index is greater than the target value.

[0157] A control method according to an example of the present disclosure includes: performing a first power supply when an environmental index is equal to or less than a target value; and performing a second power supply when the environmental index is greater than the target value. A 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. Examples of magnetic recording media include hard disk drives (HDDs) and flexible disks. Examples of magneto-optical recording media include magneto-optical disks (MOs). Examples of optical recording media include compact discs (CDs) and digital versatile discs (DVDs).

[0158] A management method according to an example of the present disclosure includes determining a power supply source to supply power to the power load 5. When the environmental index is equal to or less than the environmental target value, the power supply source does not include the commercial power source 2 but includes the fuel cell equipment 20. When the environmental index is greater than the environmental target value, the power supply source does not include the fuel cell equipment 20 but includes the commercial power source 2. A program according to an example of the present disclosure includes instructions that, when executed by a processor, cause the processor to execute the management 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 management method is executed by a server. In another example, the management method is executed by a control device 50a. In one example, the program is implemented in a server. In another example, the program is implemented in the control device 50a. 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.

[0159] Unless there is a particular contradiction, the configurations relating to the power supply system 1a, the server, the operation method, the control method, and the management method are mutually applicable unless there is a particular contradiction.

[0160] The technology disclosed herein can be applied to factories and the like.

Claims

1. An operation method for a power supply system equipped with a fuel cell equipment and capable of supplying power to a power load by connecting to a commercial power source, the operation method including performing a first power supply when an environmental index is equal to or lower than a target value, and performing a second power supply when the environmental index is greater than the target value, wherein in the first power supply, power is supplied from the fuel cell equipment to the power load without being supplied from the commercial power source to the power load, and in the second power supply, power is supplied from the commercial power source to the power load without being supplied from the fuel cell equipment to the power load, and the environmental index is the renewable energy ratio in the power consumption of the power load or the carbon dioxide reduction rate by the power supply system.

2. The operation method according to claim 1, wherein the power supply system includes a solar power generation equipment, the period during which the first power supply is performed includes a period during which power corresponding to the power consumption and the power generated by the solar power generation equipment is supplied from the fuel cell equipment to the power load, and the period during which the second power supply is performed includes a period during which power corresponding to the power consumption and the power generated by the solar power generation equipment is supplied from the commercial power source to the power load.

3. The operation method according to claim 1 or 2, wherein the power supply system comprises a solar power generation equipment and a storage battery equipment, a control cycle of the storage battery equipment is shorter than a control cycle of the fuel cell equipment, the period during which the first power supply is performed includes a period during which the power generated by the solar power generation equipment, the charging / discharging power of the storage battery equipment, and power corresponding to the power generated by the fuel cell equipment are supplied to the power load, and the period during which the second power supply is performed includes a period during which the power generated by the solar power generation equipment, the charging / discharging power of the storage battery equipment, and power purchased from the commercial power source to the power supply system are supplied to the power load.

4. An operating method according to any one of claims 1 to 3, comprising repeating a control cycle including: obtaining a plurality of calculated values ​​by performing calculation of the environmental index a plurality of times; and calculating a representative value according to the plurality of calculated values.

5. The method of claim 4, further comprising transmitting a signal to a terminal to cause the terminal to display the change over time of the representative value.

6. The operating method according to claim 5, wherein the change over time of the representative value is a graph in which the representative values ​​are arranged at intervals of one month or less.

7. An operating method as claimed in any one of claims 1 to 6, comprising transmitting a signal to a terminal to cause the terminal to display the change over time in the power generation of the fuel cell equipment, the change over time in the power consumption, and the change over time in the environmental index.

8. A power supply system equipped with a fuel cell equipment and capable of supplying power to a power load by connecting to a commercial power source, wherein a first power supply is performed when an environmental index is equal to or lower than a target value, and a second power supply is performed when the environmental index is greater than the target value, wherein in the first power supply, power is supplied from the fuel cell equipment to the power load without being supplied from the commercial power source to the power load, and in the second power supply, power is supplied from the commercial power source to the power load without being supplied from the fuel cell equipment to the power load, and the environmental index is the renewable energy ratio in the power consumption of the power load or the carbon dioxide reduction rate by the power supply system.

9. A server equipped with a fuel cell equipment and communicating with a power supply system capable of supplying power to a power load by connecting to a commercial power source, wherein the server determines a power supply source to supply power to the power load, and when an environmental index is equal to or less than a target value, the power supply source does not include the commercial power source but includes the fuel cell equipment, and when the environmental index is greater than the target value, the power supply source does not include the fuel cell equipment but includes the commercial power source, and the environmental index is the renewable energy ratio in the power consumption of the power load or the carbon dioxide reduction rate by the power supply system.

10. A server equipped with a fuel cell equipment and communicating with a power supply system capable of supplying power to a power load by connecting to a commercial power source, wherein the server transmits a signal to a terminal to cause the terminal to display a change over time in a representative value of an environmental index, the environmental index being the renewable energy ratio in the power consumption of the power load or the carbon dioxide reduction rate by the power supply system, and the representative value being in accordance with a plurality of calculated values ​​of the environmental index.

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