JP2015126675A - Power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system capable of suppressing the occurrence of heat surplus in which heat at the power generation of a fuel cell is surplus.SOLUTION: A control device 50 predicts, through a learning function, a peak time zone in which power consumption in a load becomes roughly larger than maximum generation power of a fuel cell 20, and also predicts the power consumption of the load in a peak time zone A in a specific period. The fuel cell 20 is operated by a load follow-up function before the peak time zone A. A power storage device 30 charges, before the peak time zone A, charge target power based on the predicted power consumption of the load in the peak time zone A, using power from a commercial power supply 90.

Description

  The present invention relates to a technology of a power supply system that supplies power from a fuel cell and a power storage device to a load.

  Conventionally, a fuel cell capable of generating power, a power storage device capable of charging / discharging the power generated by the fuel cell, and a control device for controlling charge / discharge of the power storage device, the fuel cell and the power storage device The technology of the power supply system for supplying the power from the power source to the load is known. For example, as described in Patent Document 1.

  A power supply system (energy management system) described in Patent Document 1 includes a fuel cell capable of generating power, a power storage device (storage battery) capable of charging / discharging the power generated by the fuel cell, and charging / discharging of the power storage device. And a control device (energy management device) for controlling, and supplies electric power from the fuel cell and the power storage device to a load.

  In the power supply system described in Patent Document 1, the power generation of the fuel cell and the charge / discharge of the power storage device are controlled so that the power charged in the power storage device approaches 0 at a predetermined time. Thus, in the power supply system, the power charged in the power storage device can be used until a predetermined time and can be used up as much as possible.

  However, in such control of power generation of the fuel cell and charge / discharge of the power storage device, it is inconvenient in that it is not considered to suppress the generation of excess heat during the power generation of the fuel cell.

JP2013-74689A

  The present invention has been made in view of the situation as described above, and a problem to be solved is to provide a power supply system capable of suppressing the generation of surplus heat that is generated when the fuel cell generates power. It is.

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

  That is, in claim 1, a fuel cell having a load following function, a power generation device capable of generating power, a power storage device capable of charging / discharging the power generated by the fuel cell, and a learning function for learning information on power consumption of the load And a control device that controls charging / discharging of the power storage device, and has at least one operation mode for supplying power from the fuel cell and the power storage device to the load. In the first operation mode included in the operation mode, the control device has a peak in which the power consumption of the load is substantially larger than the maximum generated power of the fuel cell in a specific period by the learning function. Predicting the time zone, and predicting the power consumption of the load in the first peak time zone of the specific period, the fuel cell The power storage device performs an operation by the load following function, and the power storage device converts a predetermined amount of power based on the power consumption of the load in the predicted first peak time zone to the first peak time zone. Before, charging is performed using power from a commercial power source.

  According to a second aspect of the present invention, the power storage device uses midnight power in the midnight time zone as power to be charged before the first peak time zone.

  According to a third aspect of the present invention, the predetermined amount is larger than a difference between the power consumption of the load and the generated power of the fuel cell in the predicted first peak time zone.

  According to a fourth aspect of the present invention, the power storage device discharges power when the power consumption of the load becomes equal to or greater than the maximum generated power of the fuel cell after charging the predetermined amount of power.

  According to a fifth aspect of the present invention, when the power storage device discharges electric power, the fuel cell stops operation by the load following function and enters a maximum power generation state in which maximum power generation is generated. When the power consumption of the load becomes smaller than the maximum power generation of the fuel cell after reaching the maximum power generation state, the fuel cell generates power and charges surplus power.

  According to a sixth aspect of the present invention, in the second operation mode that is included in the operation mode and can be arbitrarily selected from the first operation mode, the fuel cell is in a state before the first peak time period elapses. Is the maximum power generation state, and after the first peak time period has elapsed, the power generation is stopped.

  As effects of the present invention, the following effects can be obtained.

  In Claim 1, generation | occurrence | production of the heat surplus which the heat at the time of the power generation of a fuel cell surplus can be suppressed.

  According to the second aspect of the present invention, since the power storage device is charged with power using midnight power in the midnight time zone, it is possible to suppress the electricity bill.

  In claim 3, even if the actual power consumption of the load in the first peak time zone is larger than predicted, the power consumption of the load can be covered using the power charged in the power storage device. .

  According to the fourth aspect of the present invention, the power consumption of the load can be covered using the power charged in the power storage device.

  According to the fifth aspect, since the power storage device is charged / discharged a plurality of times (a plurality of cycles) in a specific period, the power storage device having a small power storage capacity can be used, and the initial cost can be reduced.

  In the sixth aspect, an appropriate operation mode can be selected according to a predetermined condition (for example, a season).

The block diagram which showed the structure of the electric power supply system which concerns on one Embodiment of this invention. Similarly, the flowchart which showed the process of the control apparatus in a 1st supply aspect. Similarly, the flowchart which showed the process of the control apparatus in a 2nd supply aspect. Similarly, the graph which showed an example of the learning result by the learning function of a control apparatus, and the electric power generation of the fuel cell in a 2nd supply mode. Similarly, the flowchart which showed the process of the control apparatus in a 3rd supply aspect. Similarly, the graph which showed the power consumption of the fuel cell in the power consumption of load, and a 3rd supply aspect. Similarly, the table | surface which compared each numerical value of the purchased electric power, gas usage-amount, CO2 discharge | emission amount, and a heat surplus in a 3rd supply aspect and a normal supply aspect. Similarly, the graph which showed the power consumption of the fuel cell in the power consumption of load and a normal supply mode.

  Below, the structure of the electric power supply system 1 which is one Embodiment of the "electric power supply system" concerning this invention is demonstrated using FIG.

  The power supply system 1 is provided in a house or the like, and supplies power from a commercial power supply 90 or a fuel cell 20 described later to a load (not shown). The power supply system 1 mainly includes a solar power generation unit 10, a fuel cell 20, a power storage device 30, a distribution board 40, and a control device 50.

  The solar power generation unit 10 is a device that generates power using sunlight (natural energy). The solar power generation unit 10 is configured by a solar panel (PV) or the like. The solar power generation unit 10 is installed in a sunny place such as on the roof of a house. The solar power generation unit 10 is configured to be able to output the generated power.

  The fuel cell 20 is an embodiment of a “fuel cell” according to the present invention. The fuel cell 20 is a device that generates power using city gas as fuel. The fuel cell 20 includes a control unit, a hot water storage unit, and the like. The fuel cell 20 has a load following function that can generate electric power that follows the power consumption of the load. In the present embodiment, the maximum generated power of the fuel cell 20 is set to 700W.

  When the fuel cell 20 generates power, carbon dioxide and heat are generated along with the power generation. The fuel cell 20 can boil hot water in the hot water storage unit using the heat generated during power generation. However, when the fuel cell 20 cannot use the heat generated during power generation, that is, when the heat is surplus (when the surplus heat is generated), the surplus heat is discharged to the outside as exhaust heat. That is, from the viewpoint of energy saving, it is desirable to suppress the generation of excess heat in order to improve energy efficiency.

  The fuel cell 20 has a lower power generation efficiency as the generated power is smaller. That is, from the viewpoint of improving the power generation efficiency, it is desirable that the fuel cell 20 generate power with a large amount of power (for example, maximum generated power).

  The fuel used by the fuel cell 20 may be not only city gas but also natural gas, alcohol, gasoline, or the like.

  The power storage device 30 is an embodiment of a “power storage device” according to the present invention. The power storage device 30 is a device that can charge power from the fuel cell 20 and the like and can discharge the charged power. The power storage device 30 includes a lithium ion battery that can charge and discharge power, a charger that rectifies supplied AC power and charges the storage battery, and an inverter that converts DC power from the storage battery into AC power and outputs the AC power And a control unit.

  The distribution board 40 distributes the power supplied from the power supply source to the load according to the power consumption of the load. The distribution board 40 includes an earth leakage breaker (not shown), a wiring breaker, a control unit, and the like. The distribution board 40 is connected to the commercial power source 90 that is a power supply source, the solar power generation unit 10, the fuel cell 20, and the power storage device 30, and the power from these is appropriately supplied.

  In addition, in this embodiment, a load is a circuit connected to the electrical appliance etc. in which electric power is consumed in a house. The load is provided for each room or for each outlet dedicated to a device that consumes a large amount of power such as an air conditioner, and is connected to the distribution board 40 (not shown).

  The control device 50 is an embodiment of a “control device” according to the present embodiment. The control device 50 manages information in the power supply system 1 and controls the power supply mode (for example, power generation of the fuel cell 20 and charge / discharge of the power storage device 30) in the power supply system 1. . The control device 50 includes a storage unit such as a RAM and a ROM, an arithmetic processing unit such as a CPU, and the like. In the storage unit of the control device 50, information related to the power supply mode in the power supply system 1 is stored in advance. Further, the control device 50 is provided with a timer counter (not shown) used for predetermined time measurement. Further, the control device 50 stores in advance various programs for first, second and third operation modes which will be described later.

  In addition, the control device 50 has a learning function for learning information related to load power consumption. In the present embodiment, the learning function refers to a load for a predetermined time period in a specific period (for example, every week from 00:00 to 24:00) by continuously acquiring (learning) information related to power consumption of the load. It is a function which predicts the information (for example, the peak time slot | zone etc. which are mentioned later) regarding power consumption.

Note that the control device 50 is electrically connected to the distribution board 40. The control device 50 can acquire information regarding the power consumption of the load from the distribution board 40.
The control device 50 is electrically connected to the fuel cell 20. The control device 50 can acquire information related to the power generated by the fuel cell 20. Further, the control device 50 can control the operation (power generation) of the fuel cell 20.
Control device 50 is electrically connected to power storage device 30. Control device 50 can acquire information related to the power charged / discharged by power storage device 30. Control device 50 can control operation of power storage device 30 (charging and discharging of power).

Note that the configuration of the “control device” according to the present invention is not limited to the configuration of the control device 50. For example, the “control device” according to the present invention may be configured by a control unit of the power storage device 30 or a control unit of the fuel cell 20.
Moreover, although the control apparatus 50 which concerns on this embodiment shall have a learning function, it is not limited to this. For example, the learning function may be configured in the fuel cell 20 or the power storage device 30.

  Below, the supply mode of the electric power in the electric power supply system 1 is demonstrated easily.

  In the present embodiment, the change in the direction of power distribution in the following description is controlled by the control device 50. However, it can be configured to be controlled by a control means such as a home server (not shown), or can be controlled by a control unit included in a switch unit or a power conditioner (not shown). Does not limit this.

  The electric power from the commercial power source 90, the electric power generated by the solar power generation unit 10, and the electric power generated by the fuel cell 20 are respectively supplied to the distribution board 40 and distributed to the load by the distribution board 40. Thus, the resident of the house can turn on the lighting or use the electric appliance by the electric power generated by the solar power generation unit 10 and the fuel cell 20 as well as the commercial power source 90. In the present embodiment, the power generated by the fuel cell 20 is set to be supplied to the distribution board 40 with priority over other power.

  In addition, when the power consumption of the load can be covered only with the power generated by the fuel cell 20, it is possible not to use the power from the commercial power source 90 or the solar power generation unit 10. As a result, it is possible to reduce power purchase from the commercial power source 90 and save power charges (utility costs). Moreover, the electric power generated by the solar power generation unit 10 can be reversely flowed to the commercial power source 90 and sold to obtain an economic profit.

  Moreover, the electric power from the commercial power supply 90 and the electric power generated by the solar power generation unit 10 are charged into the power storage device 30 in an appropriate time zone. In addition, the time slot | zone to charge can be set arbitrarily of a resident.

  For example, if the power from the commercial power supply 90 is set to be charged at midnight, the power storage device 30 can be charged with midnight power at a low charge. Moreover, if it sets so that the electric power generated in the solar power generation part 10 may be charged in the daytime time zone when sunlight is sufficiently irradiated, the electric power generated using natural energy (sunlight) is stored. The device 30 can be charged.

  In addition to the power from the commercial power supply 90 and the power generated by the solar power generation unit 10, the power charged in the power storage device 30 can be supplied to the distribution board 40. That is, when the power charged by the power storage device 30 is discharged, the discharged power is supplied to the distribution board 40. In addition, the timing which supplies electric power from the electrical storage apparatus 30 to the distribution board 40 can be set arbitrarily.

  For example, the electric power from the commercial power source 90 is charged at midnight, and the electric power generated by the solar power generation unit 10 is stored in the daytime when there is no resident in the house and the power consumption of the load is relatively low. The device 30 is set to be charged. And it sets so that the electric power charged in the electrical storage apparatus 30 may be supplied to the distribution board 40 in the night time zone after a resident returns home to go to bed. As a result, low-cost late-night power can be used in the night time zone, and power purchase from the commercial power source 90 can be reduced, and in turn, power costs can be saved.

  Thus, the power supply system 1 has various power supply modes.

  Note that the power supply system 1 is a power supply mode for supplying power from the fuel cell 20 and the power storage device 30 to the load, and suppresses generation of excess heat when the fuel cell generates power. At the same time, a power supply mode is set to suppress the generation of carbon dioxide by suppressing the amount of fuel used in the fuel cell and to reduce the utility cost.

  In the power supply mode, the power generation state of the fuel cell 20 according to charging / discharging of the power storage device 30 is a state in which the maximum generated power (700 W) is generated (hereinafter referred to as “maximum power generation state”). And a state where power generation is stopped (hereinafter referred to as “power generation stop state”).

  The power supply mode can be divided into two types according to whether or not the learning function of the control device 50 is used. Below, the aspect which does not use the learning function which the control apparatus 50 has among the supply aspects of the said electric power is called a "first supply aspect", and the aspect which utilizes the learning function which the control apparatus 50 has is called "the second supply." This is referred to as “aspect”.

  Below, the process of the control apparatus 50 in a 1st supply aspect is demonstrated using the flowchart of FIG.

In step S101, the control device 50 charges the power storage device 30 with power, causes the fuel cell 20 to generate maximum generated power (700 W), and maintains the power generation. That is, the fuel cell 20 is in the maximum power generation state and maintains this state.
After performing the process of step S101, the control device 50 proceeds to step S102.

In step S <b> 102, the control device 50 determines whether the current power consumption of the load is equal to or less than the maximum generated power (700 W) of the fuel cell 20.
If the control device 50 determines that the current power consumption of the load is less than or equal to the maximum generated power of the fuel cell 20, the control device 50 again proceeds to step S101.
On the other hand, if the control device 50 determines that the current power consumption of the load is not less than or equal to the maximum generated power of the fuel cell 20, the control device 50 proceeds to step S103.

In step S <b> 103, control device 50 discharges power from power storage device 30. As a result, the power consumption (insufficient power) of the load that is insufficient only by the power generated by the fuel cell 20 can be covered by the power discharged from the power storage device 30. In step S103, the fuel cell 20 maintains the maximum power generation state.
After performing the process of step S103, the control device 50 proceeds to step S104.

In step S <b> 104, the control device 50 determines whether the current power consumption of the load is equal to or less than the maximum generated power (700 W) of the fuel cell 20.
When the control device 50 determines that the current power consumption of the load is equal to or less than the maximum generated power of the fuel cell 20, the control device 50 proceeds to step S105. Note that the control device 50 starts time measurement by the timer counter from the time of the determination.
On the other hand, if the control device 50 determines that the current power consumption of the load is not less than or equal to the maximum generated power of the fuel cell 20, the control device 50 again proceeds to step S103.

In step S <b> 105, the control device 50 determines whether or not the state in which the power consumption of the load is equal to or less than the maximum generated power (700 W) of the fuel cell 20 has continued for 30 minutes from the result of the time measurement by the timer counter.
When the control device 50 determines that the state where the power consumption of the load is equal to or less than the maximum generated power of the fuel cell 20 continues for 30 minutes, that is, when the state determined in step S104 continues for 30 minutes, The process proceeds to step S107.
On the other hand, when it is determined that the state in which the power consumption of the load is equal to or less than the maximum generated power of the fuel cell 20 has not been continued for 30 minutes, that is, the state determined in step S104 has not been continued for 30 minutes. In step S106, the process proceeds to step S106.

  It should be noted that an arbitrary value can be set for “30 minutes” as a determination criterion in step S105.

In step S106, the control device 50 resets the result (count) of time measurement by the timer counter.
The control apparatus 50 performed the process of step S106, and again moves to step S104.

In step S <b> 107, the control device 50 stops the power generation of the fuel cell 20 by discharging the power storage device 30. Specifically, the control device 50 discharges the power corresponding to the power consumption from the power storage device 30 in order to cover the power consumption of the load only with the power discharged from the power storage device 30. Thereby, the power generation state of the fuel cell 20 changes from the maximum power generation state to the power generation stop state.
After performing the process of step S107, the control device 50 proceeds to step S108.

In step S <b> 108, control device 50 determines whether there is a remaining amount of power charged in power storage device 30.
If control device 50 determines that there is a remaining amount of power charged in power storage device 30, the control device 50 proceeds to step S109.
On the other hand, when control device 50 determines that there is no remaining amount of power charged in power storage device 30, the control device 50 proceeds to step S110.

  In step S108, it is determined whether or not the remaining amount of power charged in power storage device 30 is equal to or less than a predetermined ratio, not whether or not there is a remaining amount of power charged in power storage device 30. be able to. The predetermined ratio can be set to any value.

In step S109, the control device 50 determines whether the current power consumption of the load is 80% (560W) or more of the maximum generated power (700W) of the fuel cell 20.
When the control device 50 determines that the current power consumption of the load is 80% or more of the maximum generated power of the fuel cell 20, the control device 50 proceeds to step S101 again. That is, the power storage device 30 is charged with power, and the fuel cell 20 is caused to generate maximum generated power. Thereby, the power generation state of the fuel cell 20 changes from the maximum power generation state to the power generation stop state.
On the other hand, if the control device 50 determines that the current power consumption of the load is not 80% or more of the maximum generated power of the fuel cell 20, the control device 50 proceeds to step S107 again.

  It should be noted that an arbitrary value can be set for “80%” as a criterion for determination in step S109.

In step S <b> 110, control device 50 stops the operation of power storage device 30. Accordingly, the control device 50 causes the fuel cell 20 to perform a load following operation in which power generation is performed according to the power consumption of the load. That is, the fuel cell 20 is in a power generation state different from the maximum power generation state and the power generation stop state.
After performing the process of step S110, the control device 50 proceeds to step S111.

In step S <b> 111, the control device 50 determines whether or not the current load power consumption is equal to or less than the maximum generated power (700 W) of the fuel cell 20.
If the control device 50 determines that the current power consumption of the load is less than or equal to the maximum generated power of the fuel cell 20, the control device 50 again proceeds to step S101.
On the other hand, if the control device 50 determines that the power consumption of the current load is not less than or equal to the maximum generated power of the fuel cell 20, the control device 50 again proceeds to step S111.

  Thus, in the first supply mode, the fuel cell 20 changes its power generation state between the maximum power generation state and the power generation stop state in accordance with charging / discharging of the power storage device 30.

  In the first supply mode, when the fuel cell 20 is in the maximum power generation state (step S101), the state where the power consumption of the load is equal to or less than the maximum power generation power of the fuel cell 20 continues for 30 minutes (step S105). YES), the fuel cell 20 is brought into a power generation stop state (step S107).

  With such a configuration, when the power consumption of the load becomes equal to or less than the maximum power generation power of the fuel cell 20 while the fuel cell 20 is in the maximum power generation state, surplus power that is not supplied to the load among the power generated by the fuel cell 20 Can be charged in the power storage device 30. Then, when the state where the power consumption of the load is equal to or less than the maximum generated power of the fuel cell 20 continues for 30 minutes, the power discharged from the power storage device 30 is supplied to the load, and the fuel cell 20 is brought into a power generation stopped state. Can do.

  That is, if the power storage device 30 is charged, and the power consumption of the load is equal to or lower than the maximum generated power of the fuel cell 20 and the fuel cell 20 does not need to be in the maximum power generation state, By setting the fuel cell 20 to the power generation stop state, it is possible to suppress the generation of excess heat that is generated when the fuel cell 20 generates heat. Further, by setting the fuel cell 20 to the power generation stop state, it is possible to suppress the generation of carbon dioxide by reducing the amount of city gas used as fuel, and to reduce the utility cost.

  In the first supply mode, when the fuel cell 20 is in the power generation stop state (step S107), when the power consumption of the load becomes 80% or more with respect to the maximum generated power of the fuel cell 20 (step S109; YES), the power storage device 30 is charged with electric power to bring the fuel cell 20 into the maximum power generation state (step S101).

  With such a configuration, when the power consumption of the load approaches the maximum generated power of the fuel cell 20, that is, when the power consumption of the load becomes relatively large, the fuel cell 20 is set to the maximum power generation state and the fuel cell. The electric power generated at 20 can be supplied to the load. That is, when the power consumption of the load does not approach the maximum generated power of the fuel cell 20, that is, when the power consumption of the load is relatively small, the fuel cell 20 maintains the power generation stop state. It is possible to suppress the generation of excess heat due to excess heat. Further, by setting the fuel cell 20 to the power generation stop state, it is possible to suppress the generation of carbon dioxide by reducing the amount of city gas used as fuel, and to reduce the utility cost.

  Further, in the first supply mode, when the fuel cell 20 is in a power generation stop state (step S107), if there is no remaining amount of power charged in the power storage device 30 (step S108; NO), the power storage device 30. Charging / discharging is stopped, and the fuel cell 20 is generated according to the power consumption of the load (step S110).

  With such a configuration, it is possible to prevent the electric power charged in the power storage device 30 from being lost while the fuel cell 20 maintains the power generation stop state. That is, it is possible to prevent the power purchased from the commercial power supply 90 from being supplied to the load while the fuel cell 20 maintains the power generation stop state.

  In the first supply mode, when power is discharged from the power storage device 30 and the fuel cell 20 is changed from the maximum power generation state to the power generation stop state (step S107), the power consumption of the load is the maximum of the fuel cell 20. When the generated power becomes 80% or more (step S109; YES), the power storage device 30 charges the power and changes the fuel cell 20 from the power generation stop state to the maximum power generation state (step S101). Thus, when the fuel cell 20 changes from the maximum power generation state to the power generation stop state, the condition that the power consumption of the load is equal to or lower than the maximum power generation power of the fuel cell 20 is continued for 30 minutes.

  With such a configuration, the period that becomes the condition is set to, for example, 30 minutes that is a relatively long period instead of 5 minutes that is a relatively short period, thereby preventing the power storage device 30 from repeatedly charging and discharging. doing.

  Below, the process of the control apparatus 50 in a 2nd supply aspect is demonstrated using the flowchart of FIG. 3, and FIG.

  Here, the solid line in FIG. 4 is a graph showing an example of a learning result (predicted transition of load power consumption) by the learning function of the control device 50. Specifically, the learning result shown in FIG. 4 indicates that the control device 50 continuously acquires information on the power consumption of the load on the same day of the week (for example, Wednesday) for the next one month. (Hereinafter, referred to as a “specific period”) is a prediction of the transition of power consumption of the load from 0 o'clock to 24 o'clock.

  As shown in FIG. 4, in the predicted transition of the power consumption of the load, the time period in which the power consumption of the load is substantially larger than the maximum generated power (700 W) of the fuel cell 20 (hereinafter referred to as “peak time period”). Are generated once in the morning and in the afternoon (two times in total). Hereinafter, the peak time zone that occurs in the morning (the first peak time zone after the start of a specific period) is referred to as “peak time zone A”. A peak time zone that occurs in the afternoon (second peak time zone after the start of a specific period) is referred to as “peak time zone B”.

  In the following description, it is assumed that the control of the control device 50 starts at 0 o'clock in a specific period and ends (resets) at 24 o'clock. The control device 50 acquires information on the current time from the result of time measurement by the timer counter.

In step S201, the control device 50 determines whether or not the current time has passed the first peak time zone from the result of the time measurement by the timer counter, that is, the current time is within the peak time zone A shown in FIG. It is determined whether or not it has elapsed.
Then, when it is determined that the current time has passed the peak time zone A, that is, when 9:40 shown in FIG. 4 has elapsed, the control device 50 proceeds to step S203.
On the other hand, when it is determined that the current time has not passed the peak time zone A, that is, when 9:40 shown in FIG. 4 has not passed, the control device 50 proceeds to step S202.

In step S202, when the power consumption of the load is smaller than the maximum generated power (700W) of the fuel cell 20, the control device 50 causes the power storage device 30 to charge the power and causes the fuel cell 20 to generate the maximum generated power (700W). Power generation and maintain the power generation. That is, the fuel cell 20 is in the maximum power generation state and maintains this state.
Control device 50 discharges power from power storage device 30 when the power consumption of the load is equal to or greater than the maximum generated power (700 W) of fuel cell 20. In this case, the fuel cell 20 maintains the maximum power generation state.
Thus, in step S202, the fuel cell 20 enters the maximum power generation state and maintains the state.
The control device 50 proceeds to step S201 again after performing the process of step S202.

In step S <b> 203, the control device 50 determines whether the current power consumption of the load is equal to or less than the maximum generated power (700 W) of the fuel cell 20.
When the control device 50 determines that the current power consumption of the load is equal to or less than the maximum generated power of the fuel cell 20, the control device 50 proceeds to step S204. Note that the control device 50 starts time measurement by the timer counter from the time of the determination.
On the other hand, if the control device 50 determines that the current power consumption of the load is not less than or equal to the maximum generated power of the fuel cell 20, the control device 50 proceeds to step S203 again.

In step S204, the control device 50 determines whether or not the state in which the power consumption of the load is equal to or less than the maximum generated power (700 W) of the fuel cell 20 has continued for 5 minutes from the result of the time measurement by the timer counter.
When the controller 50 determines that the state where the power consumption of the load is equal to or less than the maximum generated power of the fuel cell 20 has continued for 5 minutes, that is, when the state determined in step S203 continues for 5 minutes, The process proceeds to step S206.
On the other hand, when it is determined that the state in which the power consumption of the load is equal to or less than the maximum generated power of the fuel cell 20 has not continued for 5 minutes, that is, the state determined in step S203 does not continue for 5 minutes. In step S205, the process proceeds to step S205.

  It should be noted that an arbitrary value can be set for “5 minutes” as a criterion for determination in step S204.

In step S205, the control device 50 resets the result (count) of time measurement by the timer counter.
The control apparatus 50 performed the process of step S205, and again moves to step S203.

In step S <b> 206, the control device 50 stops the power generation of the fuel cell 20 due to the discharge of the power storage device 30. Specifically, the control device 50 discharges the power corresponding to the power consumption from the power storage device 30 in order to cover the power consumption of the load only with the power discharged from the power storage device 30. Thereby, the power generation state of the fuel cell 20 changes from the maximum power generation state to the power generation stop state.
After performing the process of step S206, the control device 50 proceeds to step S207.

In step S207, control device 50 determines whether or not there is a remaining amount of power charged in power storage device 30.
If control device 50 determines that there is a remaining amount of power charged in power storage device 30, control device 50 proceeds to step S209.
On the other hand, if control device 50 determines that there is no remaining amount of power charged in power storage device 30, the control device 50 proceeds to step S208.

  In step S207, it is determined whether or not the remaining amount of power charged in power storage device 30 is equal to or less than a predetermined ratio, not whether or not there is a remaining amount of power charged in power storage device 30. be able to. The predetermined ratio can be set to any value.

In step S <b> 208, control device 50 stops the operation of power storage device 30. Accordingly, the control device 50 causes the fuel cell 20 to perform a load following operation in which power generation is performed according to the power consumption of the load. That is, the fuel cell 20 is in a power generation state different from the maximum power generation state and the power generation stop state.
After performing the process in step S208, the control device 50 proceeds to step S209.

In step S209, the control device 50 determines whether or not the current power consumption of the load is 80% (560W) or more of the maximum generated power (700W) of the fuel cell 20.
When the control device 50 determines that the current power consumption of the load is 80% or more of the maximum generated power of the fuel cell 20, the process proceeds to step S210.
On the other hand, if the control device 50 determines that the current power consumption of the load is not 80% or more of the maximum generated power of the fuel cell 20, the control device 50 proceeds to step S207 again.

  It should be noted that an arbitrary value can be set for “80% or more” which is a criterion for determination in step S209.

In step S210, the control device 50 determines whether or not the current time has passed 24:00 from the result of time measurement by the timer counter.
If the control device 50 determines that the current time has passed 24:00, the control device 50 proceeds to step S212.
On the other hand, if it is determined that the current time has not passed 24:00, the control device 50 proceeds to step S211.

In step S211, when the power consumption of the load is smaller than the maximum generated power (700W) of the fuel cell 20, the control device 50 charges the power storage device 30 with the power and causes the fuel cell 20 to generate the maximum generated power (700W). Power generation and maintain the power generation. That is, the fuel cell 20 is in the maximum power generation state and maintains this state.
Control device 50 discharges power from power storage device 30 when the power consumption of the load is equal to or greater than the maximum generated power (700 W) of fuel cell 20. In this case, the fuel cell 20 maintains the maximum power generation state.
Thus, in step S211, the fuel cell 20 enters the maximum power generation state and maintains the state.
After performing the process in step S211, the control device 50 proceeds to step S210 again.

In step S212, the control device 50 resets the peak time zone count (time measurement by the timer counter).
The control apparatus 50 complete | finishes the process in a 2nd supply aspect, after performing the process of step S212.

  Thus, in the second supply mode, the fuel cell 20 changes its power generation state between the maximum power generation state and the power generation stop state in accordance with charging / discharging of the power storage device 30.

  In the present embodiment, that is, in a specific period predicted to have two peak time periods by the learning function, the power generation state (generated power) of the fuel cell 20 is as shown by the dashed line in FIG. . Specifically, as shown in FIG. 4, the fuel cell 20 is in the maximum power generation state until the first peak time zone (peak time zone A) has elapsed. Then, after the peak time zone A has elapsed, if the state where the power consumption of the load is equal to or less than the maximum generated power of the fuel cell 20 continues for 5 minutes (9:40 shown in FIG. 4), the fuel cell 20 From the state, the power generation is stopped. When the power consumption of the load becomes 80% or more of the maximum generated power of the fuel cell 20 (shown in FIG. 4, 15:45), the second peak time zone (peak time zone B) is generated. The fuel cell 20 changes from the power generation stop state to the maximum power generation state. The maximum power generation state of the fuel cell 20 continues until 24:00, that is, until the control of the control device 50 in a specific period ends.

  As described above, in the second supply mode, before the first peak time period (peak time period A) elapses after the specific period is started (step S201; NO), the fuel cell 20 is configured to generate maximum power. After the peak time zone A has elapsed (step S201; YES), the fuel cell 20 is brought into a power generation stop state (step S206).

  With such a configuration, when the power consumption of the load becomes equal to or less than the maximum power generation power of the fuel cell 20 while the fuel cell 20 is in the maximum power generation state, surplus power that is not supplied to the load among the power generated by the fuel cell 20 Can be charged in the power storage device 30. Then, when the power consumption of the load is equal to or less than the maximum generated power of the fuel cell 20, the power discharged from the power storage device 30 can be supplied to the load, and the fuel cell 20 can be brought into a power generation stopped state.

  That is, if the power storage device 30 is charged, and the power consumption of the load is equal to or lower than the maximum generated power of the fuel cell 20 and the fuel cell 20 does not need to be in the maximum power generation state, By setting the fuel cell 20 to the power generation stop state, it is possible to suppress the generation of excess heat that is generated when the fuel cell 20 generates heat. Further, by setting the fuel cell 20 to the power generation stop state, it is possible to suppress the generation of carbon dioxide by reducing the amount of city gas used as fuel, and to reduce the utility cost.

  In the second supply mode, after the first peak time zone (peak time zone A) has elapsed (step S201; YES), the power consumption of the load is less than or equal to the maximum generated power of the fuel cell 20. Is not continued for 5 minutes (step S204; NO), the fuel cell 20 is not stopped and the maximum power generation state is continued.

  With such a configuration, when the fuel cell 20 changes from the maximum power generation state to the power generation stop state, the predetermined state can be a condition that continues for 5 minutes, and the power storage device 30 can repeatedly charge and discharge. Can be prevented.

  In the second supply mode, since the peak time zone is predicted by the learning function, it is a relatively short period (unlike the first supply mode that is conditional on a continuation of 30 minutes, which is a relatively long period). The continuation for 5 minutes is a condition. In other words, the fuel cell 20 can be changed from the maximum power generation state to the power generation stop state on condition that the fuel cell 20 is continued for 5 minutes, which is a relatively short period. can do. Further, by setting the fuel cell 20 to the power generation stop state, it is possible to suppress the generation of carbon dioxide by reducing the amount of city gas used as fuel, and to reduce the utility cost.

  In the second supply mode, when the fuel cell 20 is in a power generation stop state (step S206), when the power consumption of the load becomes 80% or more with respect to the maximum generated power of the fuel cell 20 (step S209; YES), the power storage device 30 is charged with electric power to bring the fuel cell 20 into the maximum power generation state (step S211).

  With such a configuration, when the power consumption of the load approaches the maximum generated power of the fuel cell 20, that is, when the power consumption of the load becomes relatively large, the fuel cell 20 is set to the maximum power generation state and the fuel cell. The electric power generated at 20 can be supplied to the load. That is, when the power consumption of the load does not approach the maximum generated power of the fuel cell 20, that is, when the power consumption of the load is relatively small, the fuel cell 20 maintains the power generation stop state. It is possible to suppress the generation of excess heat due to excess heat. Further, by setting the fuel cell 20 to the power generation stop state, it is possible to suppress the generation of carbon dioxide by reducing the amount of city gas used as fuel, and to reduce the utility cost.

  In the second supply mode, when the fuel cell 20 is in the power generation stop state (step S206), the power storage device 30 indicates that there is no remaining power charged in the power storage device 30 (step S207; NO). Charging / discharging is stopped and the fuel cell 20 is caused to generate power according to the power consumption of the load (step S208).

  With such a configuration, it is possible to prevent the electric power charged in the power storage device 30 from being lost while the fuel cell 20 maintains the power generation stop state. That is, it is possible to prevent the power purchased from the commercial power supply 90 from being supplied to the load while the fuel cell 20 maintains the power generation stop state.

  In the second supply mode, since the peak time zone is predicted by the learning function (the first supply mode that sets the fuel cell 20 to the maximum power generation state when the power stored in the power storage device 30 is exhausted) The load follow-up operation is performed by the fuel cell 20 until the next peak time period occurs. That is, it is possible to prevent the fuel cell 20 from entering the maximum power generation state when the power consumption of the load temporarily increases (that is, when the fuel cell 20 does not need to be in the maximum power generation state). it can. In this way, it is possible to suppress the generation of excess heat when the fuel cell 20 generates heat. Further, by setting the fuel cell 20 to the power generation stop state, it is possible to suppress the generation of carbon dioxide by reducing the amount of city gas used as fuel, and to reduce the utility cost.

  Further, in the power supply system 1, in addition to the above-described power supply modes (first supply mode and second supply mode), the generation of excess heat due to heat generated during power generation of the fuel cell 20 is suppressed. The power supply mode is set. Hereinafter, the power supply mode is referred to as a “third supply mode”.

  Below, the process of the control apparatus 50 in a 3rd supply aspect is demonstrated using the flowchart of FIG. 5, and FIG.

  Here, FIG. 6 is a graph showing actual load power consumption (see solid line) and power generated by the fuel cell 20 (see alternate long and short dash line) in the third supply mode. In FIG. 6 (and FIG. 8 described later), it is assumed that the power from the commercial power supply 90 charged in the power storage device 30 is included in the power consumption of the load.

  In the following description, it is assumed that the control of the control device 50 starts at 0 o'clock in a specific period and ends (resets) at 24 o'clock. The control device 50 acquires information on the current time from the result of time measurement by the timer counter. In addition, the control device 50 causes the fuel cell 20 to perform a load following operation (operation using a load following function) at 0 o'clock in a specific period (that is, at the time when the specific period starts).

In step S301, the control device 50 determines whether or not the current time is in the late-night charging time zone from the result of time measurement by the timer counter.
Note that the “midnight charging time zone” means that the power storage device 30 is charged with a predetermined amount of power in a time zone (midnight time zone) in which the power from the commercial power supply 90 becomes relatively inexpensive midnight power. Is a predetermined time zone set in advance. In the present embodiment, a fixed period from 5:00 am is set as the late-night charging time zone (see FIG. 6).
If the control device 50 determines that the current time is in the late-night charging time zone, the control device 50 proceeds to step S302.
On the other hand, if the control device 50 determines that the current time is not the midnight charging time zone, the control device 50 proceeds to step S304.

  In step S <b> 302, the control device 50 uses, as the predetermined amount of power, power to cover the power consumption of the load in the first peak time zone (in this embodiment, the peak time zone A) as the power storage device 30. To charge. In such a case, the control device 50 uses an inexpensive midnight power in the midnight time zone and suppresses the excess heat of the fuel cell 20 at 5:00 am in FIG. 6 (5 hours after the start of a specific period). The power from the commercial power supply 90 is charged in the power storage device 30 in a relatively short period of time as indicated by the arrows).

  The specific amount of power charged in power storage device 30 is calculated by control device 50 using a predetermined mathematical formula (Formula 1 described later). Hereinafter, the power for covering the power consumption of the load in the peak time zone A is referred to as “charging target power”.

The charging target power is calculated by the following formula 1.
Charge target power = Power consumption of the load in the predicted first peak time zone (in the present embodiment, the peak time zone A) −Power generation power of the fuel cell 20 (in the peak time zone A) + α (Expression) 1)
In Equation 1, “power” refers to the amount of power in a certain period.

  The “predicted power consumption of the load during the first peak time period” is calculated by the control device 50 as a learning result by the learning function.

  Further, the “α” is a value (power) for giving a margin to the remaining amount of power charged in the power storage device 30 as the charge target power. That is, the charging target power is larger by “α” (50 W in the present embodiment) than the difference between the predicted power consumption of the load in the peak time zone A and the generated power of the fuel cell 20.

  Thus, even when the actual load power consumption in the peak time zone A is slightly larger than predicted (more specifically, when the power consumption is larger in the range up to 50 W than predicted), the power storage device 30 is used as the charging target power. It is possible to cover the power consumption of the load by using the power charged in the battery. In this embodiment, “α” is 50 W, but can be changed as appropriate.

  In the present embodiment, midnight power in the midnight time zone is used as the power to be charged in the power storage device 30 as the charge target power. That is, since inexpensive midnight power is used as power to cover the power consumption of the load in the peak time zone A, the power charge can be suppressed.

  Note that the midnight charging time zone (the time zone in which the power storage device 30 is charged with power as the charging target power) is desirably a time zone close to the time (for example, 7:00 am) when the midnight time zone ends. Thereby, the power storage device 30 can reduce the standby power up to the peak time zone A after charging the power as the charging target power.

  After performing the process of step S302, the control device 50 proceeds to step S303.

In step S303, control device 50 determines whether or not charging of power storage device 30 with electric power as charging target electric power has been completed.
If control device 50 determines that charging of power storage device 30 with power as the charging target power has been completed, control device 50 proceeds to step S304.
On the other hand, if control device 50 determines that charging of power storage device 30 with electric power as charging target electric power has not been completed, control device 50 proceeds to step S303 again.

In step S <b> 304, the control device 50 determines whether the current power consumption of the load is smaller than the maximum generated power (700 W) of the fuel cell 20.
If the control device 50 determines that the current power consumption of the load is smaller than the maximum generated power (700 W) of the fuel cell 20, the process proceeds to step S308.
On the other hand, if the control device 50 determines that the current power consumption of the load is greater than or equal to the maximum generated power (700 W) of the fuel cell 20, the process proceeds to step S305.

  When the power consumption of the load becomes equal to or higher than the maximum generated power (700 W) of the fuel cell 20 for the first time after the charging of the power as the charging target power to the power storage device 30 is completed, the fuel cell 20 Generates maximum generated power (700 W) by operation (maximum power generation state). Then, once the fuel cell 20 reaches the maximum power generation state, the load following operation is stopped, and the maximum power generation state is maintained until the last peak time zone of the specific period (in this embodiment, the peak time zone B) ends. To do. Then, when the peak time period B ends, the fuel cell 20 performs a load following operation (operation by the load following function).

  When the power consumption of the load becomes equal to or higher than the maximum generated power (700 W) of the fuel cell 20 for the first time after the charging of the power storage device 30 with the power as the charging target power is completed, the current time is the peak time zone. A (first peak time zone) is assumed.

In step S <b> 305, control device 50 determines whether there is a remaining amount of power charged in power storage device 30.
If control device 50 determines that there is a remaining amount of power charged in power storage device 30, control device 50 proceeds to step S306.
On the other hand, if control device 50 determines that there is no remaining amount of power charged in power storage device 30, the control device 50 proceeds to step S307.

  In step S305, it is determined whether or not the remaining amount of power charged in power storage device 30 is equal to or less than a predetermined ratio, not whether or not there is a remaining amount of power charged in power storage device 30. be able to. The predetermined ratio can be set to any value.

In step S <b> 306, control device 50 discharges power from power storage device 30.
More specifically, control device 50 causes power storage device 30 to discharge the difference between the current power consumption of the load and the maximum generated power (700 W) of fuel cell 20. In this way, the power consumption (insufficient power) of the load that is insufficient with only the power generated by the fuel cell 20 can be covered using the power discharged from the power storage device 30.

  In step S306, when the current time is peak time zone A, the power discharged from power storage device 30 is the power charged in power storage device 30 as the charge target power in the late-night charging time zone. That is, the power consumption in the load in the peak time zone A can be covered by using inexpensive late-night power charged in the power storage device 30.

  After performing the process of step S306, the control device 50 proceeds to step S301 again.

In step S307, when power is discharged from power storage device 30, control device 50 stops the discharge.
After performing the process of step S307 (or when electric power is not discharged from power storage device 30), control device 50 proceeds to step S301 again.

In step S308 transferred from step S304, control device 50 determines whether or not power storage device 30 is fully charged.
If control device 50 determines that power storage device 30 is fully charged, control device 50 proceeds to step S304 again.
On the other hand, if control device 50 determines that power storage device 30 is not fully charged, the control device 50 proceeds to step S309.

In step S309, control device 50 causes power storage device 30 to charge power.
More specifically, the control device 50 causes the power storage device 30 to charge the amount of power between the maximum generated power (700 W) of the fuel cell 20 and the current power consumption of the load. Thus, in step S309, the power storage device 30 is charged using only the power generated by the fuel cell 20 without using the power from the commercial power supply 90 (that is, the power in the daytime period different from the inexpensive midnight power). Let

  Thus, in step S309, the electric power charged in the power storage device 30 is used for the second and subsequent peak time periods (in this embodiment, the peak time period B) (step S301; NO to step S304). Step S305, Step S306). That is, the power consumption of the load in the peak time zone B is covered by the power charged in the power storage device 30 using the power generated by the fuel cell 20.

  After performing the process of step S309, the control device 50 proceeds to step S301 again.

  As described above, in the process of the control device 50 in the third supply mode, the fuel cell 20 performs the load following operation (operation by the load following function) before the peak time zone A. In addition, the power storage device 30 is charged with power (charge target power) for covering the power consumption of the load in the peak time zone A using the power from the commercial power supply 90.

  Thereby, before the peak time zone A, since the fuel cell 20 performs the load following operation (not in the maximum power generation state), for example, the fuel cell 20 is continuously in the maximum power generation state during a specific period. Compared to the case (see FIG. 8 described later), it is possible to suppress the generation of excess heat when the fuel cell 20 generates heat during power generation.

  7 shows the third supply mode in the above-described specific period of “electric power purchased from commercial power supply 90 (purchased electric power)”, “city gas usage (gas usage)”, “carbon dioxide Each numerical value of “emission amount (CO2 emission amount)” and “heat surplus” is shown. In FIG. 7, in order to clarify the magnitude of each numerical value in the third supply mode, the fuel cell 20 is left in the maximum power generation state during the specific period described above (hereinafter, “normal supply mode”). 8), “electric power purchased from commercial power supply 90 (purchased electric power)”, “city gas consumption (gas consumption)”, “carbon dioxide emission (CO2 emission)”, and Each value of “heat residue” is shown.

  As a result, as shown in FIG. 7, in the third supply mode, the value of purchased power is slightly larger than that in the normal supply mode, but the value of the surplus heat is zero. Thus, when the process of the control apparatus 50 in a 3rd supply aspect is performed, generation | occurrence | production of the heat surplus which the heat at the time of the electric power generation of the fuel cell 20 surplus can be suppressed.

  In the present embodiment, as described above, the power supply system 1 is configured with three supply modes, ie, the first, second, and third supply modes, as the power supply modes. And these supply aspects are implement | achieved by selecting the operation mode which can be selected arbitrarily.

  More specifically, in the power supply system 1, a plurality of (three) operation modes are provided. The three operation modes are a first operation mode for realizing the third supply mode, a second operation mode for realizing the second supply mode, and a first supply mode. And a third operation mode.

  When a desired operation mode is selected from the first, second and third operation modes, a specific supply mode corresponding to the selection is realized. For example, if the current season is a period in which air conditioning equipment is not used compared to summer or winter, such as spring or autumn (that is, a period in which the power consumption of the load is relatively small and excess heat is likely to occur), the first The operation mode is selected to realize the third supply mode, and the generation of excess heat can be suppressed (compared to the first and second supply modes). The operation mode is appropriately selected by a resident of the house.

As described above, in the power supply system 1,
A fuel cell 20 having a load following function and capable of generating electricity;
A power storage device 30 capable of charging and discharging the power generated by the fuel cell 20, and
A control device 50 having a learning function for learning information on power consumption of a load, and controlling charging / discharging of the power storage device 30;
Comprising
An electric power supply system having at least one operation mode for supplying electric power from the fuel cell 20 and the power storage device 30 to the load,
In the first operation mode included in the operation mode,
The control device 50 predicts a peak time period in which the power consumption of the load is substantially larger than the maximum generated power of the fuel cell 20 in a specific period by the learning function, and the first peak in the specific period. Predict the power consumption of the load in the time zone (peak time zone A),
The fuel cell 20 is operated by the load following function before the first peak time period,
The power storage device 30 supplies a predetermined amount of power (charge target power) based on the power consumption of the load in the predicted first peak time zone before the first peak time zone, using a commercial power supply. The battery is charged using the power from 90.

  With such a configuration, in the power supply system 1, it is possible to suppress the generation of excess heat due to excess heat during power generation of the fuel cell 20.

In the power supply system 1,
The power storage device 30 uses midnight power in the midnight time zone as power to be charged before the first peak time zone (charge target power).

  With such a configuration, in the power supply system 1, since the power storage device 30 is charged with power using midnight power in the midnight time zone, the electricity bill can be suppressed.

In the power supply system 1,
The predetermined amount is larger than a difference between the power consumption of the load and the generated power of the fuel cell 20 in the predicted first peak time zone.

  With such a configuration, in the power supply system 1, even when the actual load power consumption in the first peak time period is larger than predicted, the load using the power charged in the power storage device 30 is used. It can cover the power consumption.

In the power supply system 1,
The power storage device discharges power when the power consumption of the load becomes equal to or greater than the maximum generated power of the fuel cell after charging the predetermined amount of power.

  With such a configuration, the power supply system 1 can cover the power consumption of the load by using the power charged in the power storage device 30.

In the power supply system 1,
When the power storage device 30 discharges electric power, the fuel cell 20 stops operation by the load following function and enters a maximum power generation state for generating maximum generated power,
When the power consumption of the load becomes smaller than the maximum power generation of the fuel cell 20 after the fuel cell 20 reaches the maximum power generation state, the power storage device 30 generates the power generated by the fuel cell 20 and charges the surplus power. To do.

  With such a configuration, in the power supply system 1, the power storage device 30 can be charged / discharged a plurality of times (a plurality of cycles) in a specific period. Specifically, the power storage device 30 (1) charges in the late-night charging time zone before the peak time zone A and discharges in the peak time zone A, and (2) daytime time before the peak time zone B. The band is charged and discharged in the peak time zone B (charging and discharging for two cycles). Thereby, since a power storage device having a small storage capacity can be used as the power storage device 30 (for example, as compared with the case of charging and discharging for one cycle), the initial cost can be reduced.

In the power supply system 1,
In the second operation mode included in the operation mode and arbitrarily selectable with the first operation mode,
The fuel cell 20 is in the maximum power generation state before the first peak time period elapses, and is in the power generation stop state in which power generation is stopped after the first peak time period elapses. .

  With such a configuration, it is possible to select an appropriate operation mode according to a predetermined condition (for example, a season or the like).

  In addition, in this embodiment, although it was set as the structure in which three operation modes are provided, what is necessary is just the structure in which at least 1 or more operation mode is provided.

In the present embodiment, two peak time zones are provided in a specific period, but the number of peak time zones is not limited.
In the present embodiment, the specific period starts from 0 o'clock and ends (reset) at 24 o'clock, but is not limited thereto.

In addition, it is good also as a structure which calculates charge target electric energy with Formula (Formula 2) different from Formula 1 in this embodiment.
Specifically, Formula 2 is as follows.
Charging target power amount = (average power consumption in the first peak time zone (peak time zone A) −average power generation power of the fuel cell 20 in the first peak time zone (peak time zone A) + α) × first peak Time zone (peak time zone A) time (Formula 2)

  The “average power consumption in the first peak time zone (peak time zone A)” and the “time in the first peak time zone (peak time zone A)” are learned by the control device 50 using the learning function. Calculated as a result.

  In the present embodiment, “the average generated power of the fuel cell 20 in the first peak time zone (peak time zone A)” means that the power consumption of the load is equal to or higher than the maximum generated power (700 W) of the fuel cell 20 for the first time. In this case, since the fuel cell 20 is in the maximum power generation state, it becomes 700 W.

  With such a configuration, the charge target power amount can be calculated using the average power consumption in the peak time zone A and the average generated power of the fuel cell 20, so that the charge target power amount can be derived more accurately. .

DESCRIPTION OF SYMBOLS 1 Electric power supply system 20 Fuel cell 30 Power storage device 40 Distribution board 50 Control apparatus

Claims (6)

A fuel cell capable of generating electricity with a load following function;
A power storage device capable of charging and discharging the power generated by the fuel cell;
A control device having a learning function for learning information on power consumption of a load, and controlling charging and discharging of the power storage device;
Comprising
A power supply system having at least one operation mode for supplying power from the fuel cell and the power storage device to the load,
In the first operation mode included in the operation mode,
The control device predicts a peak time period in which the power consumption of the load is substantially larger than the maximum generated power of the fuel cell in a specific period by the learning function, and the first peak time period of the specific period Predict the power consumption of the load at
The fuel cell is operated by the load following function before the first peak time period,
The power storage device uses a predetermined amount of power based on the power consumption of the load in the predicted first peak time zone, using power from a commercial power source before the first peak time zone. To charge,
A power supply system characterized by that. The power storage device uses midnight power in the midnight time zone as power to be charged before the first peak time zone,
The power supply system according to claim 1, wherein The predetermined amount is larger than the difference between the power consumption of the load and the generated power of the fuel cell in the predicted first peak time period,
The power supply system according to claim 1, wherein the power supply system is a power supply system. The power storage device discharges power when the power consumption of the load becomes equal to or greater than the maximum generated power of the fuel cell after charging the predetermined amount of power.
The power supply system according to any one of claims 1 to 3, wherein When the power storage device discharges power, the fuel cell is in a maximum power generation state in which the operation by the load following function is stopped and maximum generated power is generated,
The power storage device, when the power consumption of the load becomes smaller than the maximum power generation power of the fuel cell after the fuel cell is in a maximum power generation state, the fuel cell generates power and charges surplus power,
The power supply system according to claim 4. In the second operation mode included in the operation mode and arbitrarily selectable with the first operation mode,
The fuel cell is in the maximum power generation state before the first peak time zone, and is in a power generation stop state in which power generation is stopped after the first peak time zone.
The power supply system according to any one of claims 1 to 5, wherein:

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