JP2019114404A - Power supply system and control method of power supply system - Google Patents

Abstract

To provide a power supply system capable of minimizing precooling, preheating heat quantities/time, while saving energy, and to provide a control method of power supply system.SOLUTION: A power supply system 100 includes a renewable energy power generation device 1 outputting surplus power out of the renewable energy, a hydrogen production device 2 producing hydrogen by using the surplus power, a hydrogen storage device 3 for making the hydrogen produced by the hydrogen production device occlude to a hydrogen-storing alloy and ejecting the occluded hydrogen, a fuel cell 4 for supplying the electric power, generated by using the hydrogen ejected from the hydrogen storage device, to the consumer load, a cool temperature source 6 for giving precooling temperature at the time when the hydrogen storage device makes the hydrogen-storing alloy occlude hydrogen, and giving preheating temperature at a prescribed time for ejecting hydrogen, and a control arrangement 8 for giving precooling temperature or preheating temperature to the cool temperature source on the basis of the operation plan of the hydrogen storage device.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply system and a control method of the power supply system.

  The introduction of the Renewable Energy Feed-In Tariff (FIT) system in July 2012 has significantly changed the non-residential photovoltaic market (public and industrial fields). According to JPEA PV OUTLOOK 2030, the non-residential share of gross domestic shipments was 50% in fiscal 2012 (compared to 3.8 GW in total domestic shipments) and 73 percent in fiscal 2013 (compared to 8.4 GW) In the first half of 2014 (compared to 4.3 GW in the first half of the domestic total shipment volume), it has grown significantly to 77%.

If there is a concern that the amount of power supplied by solar power generation will exceed the amount of power demand during the light load period when the demand for power is small when all of them are operated with the qualification of a large amount of facilities for solar power generation The system connection was to be conducted under the condition of “unlimited and uncompensated output suppression”.
From now on, with the increase of the amount of grid connection of photovoltaic power generation, the output control implementation as power supply and demand adjustment becomes a reality. When output control is carried out, the corresponding renewable energy is discarded, and from the viewpoint of efficient use of energy, the energy to be discarded using a storage battery or the like (hereinafter referred to as surplus power) It is desirable to store

Hydrogen has recently attracted attention as a means of storing surplus power. It has the disadvantage that the conversion from electricity to hydrogen and the reduction in efficiency due to the conversion from hydrogen to electricity are larger than storage by storage batteries, but it is suitable for large-capacity, long-term energy storage.
As a system which manufactures, stores, and uses (power generation) hydrogen using electric power, for example, there is a power supply system described in Patent Document 1. The power supply system described in Patent Document 1 is provided with a hydrogen production apparatus, a hydrogen storage apparatus, a fuel cell, a load monitor apparatus, a monitoring control apparatus to a customer linked to an electric power system, and hydrogen is predicted based on demand forecast and load fluctuation. Is a system that manufactures, stores and uses

Japanese Patent Application Laid-Open No. 2003-061251

  According to the power supply system described in Patent Document 1, the storage device can be provided with a mechanism using a hydrogen storage alloy. The amount of hydrogen dissolved in metal varies with the pressure and temperature of hydrogen. Here, FIGS. 4 and 5 show the relationship between the amount of dissolved hydrogen, the pressure, and the temperature of the hydrogen-storing alloy called a PCT curve. If the hydrogen pressure is higher than the absorption curve, hydrogen is stored in the alloy. Also, if the pressure is lower than the release curve, hydrogen is released in reverse. The PCT curve varies with the alloy composition. Since the pressure upon absorption and the pressure upon discharge are determined by the hydrogen production apparatus and the fuel cell, temperature control is required to maximize the amount of hydrogen absorbed and released depending on the alloy composition.

  However, PCT (Pressure-Composition-Temperature) of an alloy that absorbs and releases hydrogen has a wide plateau (flat) region as represented by LaNi5, for example, and has a small hysteresis of PCT at the time of absorption / release. Is suitable. This is because absorption pressure and release pressure can be easily set in a limited pressure range, and a large amount of hydrogen can be absorbed / released. However, such an alloy as described above has the property of being finely pulverized while repeating absorption and release of hydrogen, so there is a problem that the flammability is high. Therefore, although an alloy with low flammability is desirable from the viewpoint of safety, PCT of such an alloy has a narrow plateau region and a large hysteresis. Can not absorb or release a large amount of hydrogen.

  The present invention has been made in view of the above points, and even if a hydrogen storage alloy having a composition requiring temperature control is used, the amount of hydrogen can be stored / released at a predetermined time, thereby preheating and preheating heat amount It is an object of the present invention to provide a power supply system and a control method of the power supply system which can minimize time and save energy.

  In order to solve the above problems, a power supply system according to the present invention includes a renewable energy power supply that supplies renewable energy to a consumer load, and outputs renewable power among the renewable energy. A hydrogen storage alloy is made to store hydrogen by using a power generation device, a hydrogen production device that produces hydrogen using surplus power output from the renewable energy power generation device, and hydrogen produced by the hydrogen production device, A hydrogen storage device for releasing hydrogen stored in a hydrogen storage alloy, a fuel cell for generating power using hydrogen released by the hydrogen storage device, and supplying the generated power to the customer load, and the hydrogen storage device Provide a precooling temperature to the hydrogen storage device at a predetermined time at which hydrogen is absorbed into the hydrogen storage alloy, and the hydrogen storage device releases the hydrogen Create an operation plan of the hydrogen storage device that represents a hydrogen storage amount and a hydrogen release amount at a predetermined time of the hydrogen storage device, and a cold heat source that gives a preheating temperature to the hydrogen storage device every moment; And a controller configured to determine the pre-cooling temperature or the preheating temperature of the cold heat source based on an operation plan of the apparatus, and to apply the determined pre-cooling temperature or the preheating temperature to the cold heat source.

  Further, in the power supply system of the present invention, the control device estimates the surplus power from the power prediction value of the customer load and the prediction value of the renewable energy, and estimates the surplus power and the surplus power. The operation plan of the hydrogen production apparatus is prepared from the power prediction value of the customer load, and the hydrogen storage amount in the operation plan of the hydrogen storage apparatus is determined based on the prepared operation plan of the hydrogen production apparatus. In the operation plan of the hydrogen storage device, the operation plan of the fuel cell is created from the hydrogen storage amount of the hydrogen storage device and the actual power value of the load of the customer, and based on the created operation plan of the fuel cell Determine the amount of hydrogen released.

  In the power supply system according to the present invention, the controller determines the pre-cooling temperature and the preheating temperature based on a PCT curve showing the relationship between the hydrogen storage amount of the hydrogen storage alloy and the pressure and temperature.

  Further, in the power supply system according to the present invention, the control device determines the amount of heat input to the hydrogen storage device in the past by the cold heat source, the time during which the cold heat source provides the cold temperature or the preheating temperature to the cold heat source. It is determined by the alloy temperature indicating the pre-cooling temperature or the preheating temperature, the specific heat of the hydrogen storage alloy, and the outside air temperature.

  Further, in the power supply system according to the present invention, the cold heat source is divided into a cold heat source for giving the pre-cooling temperature to the hydrogen storage device and a heat source for giving the preheating temperature to the hydrogen storage device. The heat source includes: the fuel cell; and a hot water storage tank that provides the preheating temperature to the hydrogen storage device when the fuel cell is stopped.

  Further, according to the control method of the power supply system of the present invention, the renewable energy power generation apparatus has a renewable energy power supply that supplies renewable energy to a consumer load, and outputs surplus power of the renewable energy. A renewable energy generation process, a hydrogen production process in which a hydrogen production apparatus produces hydrogen using surplus power output from the renewable energy power generation apparatus, and a hydrogen storage apparatus produces hydrogen produced by the hydrogen production apparatus A hydrogen storage step of storing hydrogen by storing in hydrogen storage alloy and releasing hydrogen stored in the hydrogen storage alloy by the hydrogen storage alloy; and a fuel cell releases the hydrogen storage device A power supply step of generating power using hydrogen and supplying the generated power to the customer load, a cold heat source, and the hydrogen storage device hydrogen Applying a precooling temperature to the hydrogen storage device at a predetermined time to be stored in a stored alloy, and applying a preheating temperature to the hydrogen storage device at a predetermined time at which the hydrogen storage device releases hydrogen; The control device creates an operation plan of the hydrogen storage device representing a hydrogen storage amount and a hydrogen release amount at a predetermined time of the hydrogen storage device, and based on the operation plan of the hydrogen storage device, the precooling of the cold heat source Determining the temperature or the preheating temperature, and providing the determined pre-cooling temperature or the preheating temperature to the cold heat source.

  In the present invention, the control device creates an operation plan of the hydrogen storage device representing the hydrogen storage amount and the hydrogen release amount at a predetermined time of the hydrogen storage device. Further, the control device determines the precooling temperature or the preheating temperature of the cold heat source based on the operation plan of the hydrogen storage device, and performs control to give the determined precooling temperature or the preheating temperature to the cold heat source.

  As a result, even if a hydrogen storage alloy having a composition that requires temperature control can be stored / released at a predetermined time, a predetermined amount of hydrogen can be stored / released, whereby preheating and preheating heat / time can be minimized, thus saving energy Can be

It is a figure showing composition of an electric power supply system in this embodiment. It is a flowchart which shows the control method of a power supply system. It is a PCT curve which showed the relationship between the amount of hydrogen storage of a hydrogen storage alloy, pressure, and temperature. It is a figure for demonstrating the PCT curve of a hydrogen storage alloy. It is a figure for demonstrating the PCT curve of a hydrogen storage alloy. It is a heat system figure in this electric power supply system. It is a figure for demonstrating each operating condition and the switching state of a valve in this electric power supply system.

(Embodiment of the present invention)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Figure 1 is a diagram showing a configuration of a power supply system in the embodiment. The power supply system 100 includes a renewable energy power generation device 1, a hydrogen production device 2, a hydrogen storage device 3, a fuel cell 4, a customer load 5, a cold heat source 6, a measurement device 7, and a control device 8. .
The control device 8 creates various operation plans necessary to control the hydrogen production device 2, the hydrogen storage device 3, the fuel cell 4, and the cold heat source 6, and based on the created various operation plans, the hydrogen production device 2 , The hydrogen storage device 3, the fuel cell 4, and the cold heat source 6 are controlled.
The measuring device 7 includes various measurements necessary for the control device 8 to control the hydrogen producing device 2, the hydrogen storage device 3, the fuel cell 4, and the cold heat source 6 (renewable energy power producing device 1, hydrogen producing device 2, hydrogen The output results of the storage device 3, the fuel cell 4, the customer load 5, and the cold heat source 6 are measured.
The power supply system 100 and the control method thereof according to the present embodiment use the hydrogen storage alloy 3 that requires the temperature management as described above for the hydrogen storage device 3, and the renewable energy that is the output of the renewable energy power generation device 1 is It defines a system for hydrogen production / storage / utilization by surplus power, and its operation method. In particular, the power supply system 100 according to the present embodiment is characterized in that the cold storage 6 effectively pre-cools and preheats the hydrogen storage device 3 in preparation for generation of surplus power by the renewable energy power generation device 1.

The renewable energy power generation apparatus 1 has a renewable energy power supply (renewable energy power supply such as solar power generation and wind power generation) for supplying renewable energy to the customer load 5, and surplus power of the renewable energy is The hydrogen is output to the hydrogen production apparatus 2.
The renewable energy supplied to the customer load 5 and the surplus power supplied to the hydrogen producing device 2 are measured by the measuring device 7.
The amount of power generation of the renewable energy power supply supplied to the customer load 5 by the renewable energy power generation device 1 is measured by the measuring device 7 (indicated by M1 in FIG. 1), and can be regenerated as a measurement result for the control device 8 The amount of power generation (measured value) of the energy is transmitted (indicated by K in FIG. 1).
The surplus power supplied to the hydrogen production apparatus 2 by the renewable energy power generation apparatus 1 is measured by the measuring apparatus 7 (indicated by M2 in FIG. 1), and the surplus power (measured value) Transmitted (denoted K in FIG. 1).
The power used by the customer load 5 (demand power for the customer) is measured by the measuring device 7 (indicated by M8 in FIG. 1), and the load energy for the customer (actual value) is transmitted to the control device 8 as the measurement result. (Indicated by K in FIG. 1).

The control device 8 first predicts the customer load power and the amount of power generation of the renewable energy for a fixed period (for example, one day next day) after the current time at a certain timing (for example, the evening). From the difference between the predicted value and the power load predicted value of the customer load, the generation time zone and the amount of generation of surplus power are estimated. Next, an operation plan of the hydrogen production device 2 is created among the operation plans of the hydrogen production device 2, the hydrogen storage device 3, and the fuel cell 4 from the estimated value of the surplus power and the power prediction value of the customer load. In the hydrogen production apparatus 2, since hydrogen production is performed using the surplus power, the operation time of the hydrogen production apparatus 2 and the input power of the hydrogen production apparatus 2 coincide with the estimated value of the surplus power.
That is, the control device 8 estimates the surplus power from the predicted power value of the customer load and the predicted value of the renewable energy, and the hydrogen production device 2 from the estimated value of the surplus power and the predicted power value of the customer load Create an operation plan for
The control device 8 controls the hydrogen production device 2 based on the created operation plan of the hydrogen production device 2 (indicated by S1 in FIG. 1).

The hydrogen production apparatus 2 produces hydrogen using the surplus power output from the renewable energy power generation apparatus 1.
Further, since the hydrogen production amount which is the output of the hydrogen production apparatus 2 is proportional to the input power of the hydrogen production apparatus 2, when the operation plan of the hydrogen production apparatus 2 is determined, the hydrogen storage amount at each time is also planned.
The hydrogen production amount which is the output of the hydrogen production device 2 is measured by the measuring device 7 (indicated by M3 in FIG. 1), and the hydrogen storage amount is transmitted as the measurement result to the control device 8 (FIG. 1) In K)).
That is, the control device 8 determines the amount of stored hydrogen in the operation plan of the hydrogen storage device 3 based on the generated operation plan of the hydrogen production device 2.

The hydrogen storage device 3 uses a hydrogen storage alloy as a hydrogen storage medium, stores the hydrogen produced by the hydrogen production device 2 by causing the hydrogen storage alloy to store hydrogen, and releases the hydrogen stored in the hydrogen storage alloy. Do.
The hydrogen storage amount of the hydrogen storage device 3 is measured by the measuring device 7 (indicated by M4 in FIG. 1), and the hydrogen storage amount is transmitted as the measurement result to the control device 8 (K in FIG. 1) Show). In addition, the amount of released hydrogen, which is the output of the hydrogen storage device 3, is measured by the measuring device 7 (indicated by M6 in FIG. 1), and the amount of released hydrogen is transmitted as a measurement result to the control device 8 (FIG. 1) In K)).
The fuel cell 4 generates power using hydrogen released by the hydrogen storage device 3 and supplies the generated power to the customer load 5.
The amount of generated power which is the output of the fuel cell 4 is measured by the measuring device 7 (indicated by M7 in FIG. 1), and the amount of generated power is transmitted as the measurement result to the control device 8 (in FIG. 1) Shown by K).

The controller 8 creates an operation plan of the fuel cell 4 based on the hydrogen storage amount M4 and the actual power value M8 of the customer load 5. For example, for the purpose of reducing the contract power of the customer, an operation plan is prepared so as to operate in a time zone in which the peak power of the customer load 5 is predicted. Since a proportional relationship holds between the hydrogen release amount M6 from the alloy in the hydrogen storage device 3 and the power generation amount M7 of the fuel cell 4, the hydrogen release amount M6 is also planned when the operation plan of the fuel cell 4 is determined. Note that these proportional coefficients can be calculated by the least squares method from the past actual values (actual values M8 of the hydrogen storage amount M4 and the actual power value of the customer load 5) acquired by the measuring device 7.
That is, the control device 8 creates an operation plan of the fuel cell 4 from the hydrogen storage amount of the hydrogen storage device 3 and the actual power value of the customer load 5, and based on the created operation plan of the fuel cell 4, The amount of hydrogen release in the operation plan of the hydrogen storage device 3 is determined.
The control device 8 controls the fuel cell 4 based on the created operation plan of the fuel cell 4 (indicated by S3 in FIG. 1).
Further, the control device 8 controls the hydrogen storage device 3 based on the created operation plan of the hydrogen storage device 3 (indicated by S2 in FIG. 1).

The cold heat source 6 is a heat source for heating and cooling the hydrogen storage alloy possessed by the hydrogen storage device 3 with cold and hot water, and the hydrogen storage device 3 sends the hydrogen storage alloy 3 to the hydrogen storage device 3 at a predetermined time. A pre-cooling temperature is provided, and a preheating temperature is provided to the hydrogen storage device 3 at a predetermined time when the hydrogen storage device 3 releases hydrogen.
Since the hydrogen release amount and the hydrogen storage amount at a predetermined time of the operation plan of the hydrogen storage device 3 are determined by the operation plan of the hydrogen production device 2 and the operation plan of the fuel cell 4 as described above, the control device 8 An operation plan of the hydrogen storage device 3 representing the hydrogen storage amount and the hydrogen release amount at a predetermined time of the hydrogen storage device 3 is prepared, and the precooling temperature or the preheating temperature of the cold heat source 6 is calculated based on the operation plan of the hydrogen storage device 3 The determined and determined pre-cooling or preheating temperature is applied to the cold heat source 6 (indicated by S4 in FIG. 1).

Here, the time during which the cold heat source 6 gives the pre-cooling temperature / preheating temperature to the hydrogen storage device 3 is the heat input to the hydrogen storage device 3 in the past, the alloy temperature indicating the pre-cooling temperature or the preheating temperature, hydrogen storage It can be determined by the specific heat of the alloy and the ambient temperature.
That is, the amount of heat input to the hydrogen storage device 3 in the past by the cold heat source 6 is measured by the measuring device 7, and the amount of heat input (actually measured) is transmitted to the control device 8 as the measurement result (in FIG. Show).
Further, the precooling temperature / preheating temperature given by the cold / heat source 6 to the hydrogen storage device 3 is measured by the measuring device 7 (indicated by M5 in FIG. 1), and the precooling temperature / preheating is given to the control device 8 as a measurement result. temperature (measured value) is transmitted (indicated by K in FIG. 1).
The specific heat of the hydrogen storage alloy may be stored in advance in a memory of the control device 8. Further, the outside air temperature may be measured by the measuring device 7 by a temperature sensor (not shown in FIG. 1), and the outside air temperature may be transmitted to the control device 8 as a measurement result.

Hereinafter, the determination method of the operating method of each apparatus which the control apparatus 8 performs is demonstrated with reference to FIG. FIG. 2 is a flowchart showing a control method of the power supply system.
First, the control device 8 performs customer load prediction (step ST1). That is, the control device 8 predicts the customer load power for a fixed period after the current time at a certain timing.
Next, the control device 8 predicts a renewable energy generation amount (step ST2). That is, the control device 8 predicts the power generation amount of the renewable energy for a certain period after the current time.
Next, the control unit 8 performs the surplus power estimation (step ST3). That is, the control device 8 estimates the generation time zone and the generation amount of the surplus power from the difference between the prediction value of the renewable energy generation amount and the power prediction value of the customer load.

Next, the control device 8 creates a hydrogen production device / hydrogen storage device / fuel cell operation plan (step ST4). That is, from the estimated value of the surplus power and the estimated power value of the customer load 5, the control device 8 operates the hydrogen production device 2 among the operation plans of the hydrogen production device 2, the hydrogen storage device 3 and the fuel cell 4. Create In the hydrogen production apparatus 2, since hydrogen production is performed using the surplus power, the operation time of the hydrogen production apparatus 2 and the input power of the hydrogen production apparatus 2 coincide with the estimated value of the surplus power.
That is, the controller 8 estimates the surplus power from the power prediction value of the customer load 5 and the prediction value of the renewable energy, and produces hydrogen from the estimated value of the surplus power and the power prediction value of the customer load 5 Create an operation plan for device 2
Next, the controller 8 determines the amount of absorbed hydrogen in the operation plan of the hydrogen storage device 3 based on the operation plan of the hydrogen production device 2 created.
Next, the control device 8 creates the operation plan of the fuel cell 4 based on the hydrogen storage amount and the actual power value of the customer load 5. Further, the controller 8 determines the amount of hydrogen release in the operation plan of the hydrogen storage device 3 based on the operation plan of the fuel cell 4 created. Thus, the controller 8 creates the operation plan of the hydrogen storage device 3.

Next, the control device 8 performs precooling / preheating temperature / time setting (step ST5). That is, the controller 8 determines the hydrogen storage amount and the hydrogen release amount at each time by the operation plan creation, so that the precooling / preheating temperature and time of the cold heat source 6 can be performed so that predetermined hydrogen storage and release can be performed at a predetermined time. Decide.
FIG. 3 is a PCT curve showing the relationship between the hydrogen storage amount of the hydrogen storage alloy and the pressure and temperature.
For example, it is planned to operate the fuel cell 4 for three hours after six hours, and the hydrogen storage amount is to be used from 50% to 20% as shown in FIG.
As shown in FIG. 3, in this case, the alloy temperature can not be released at 50 ° C. or more and at 50%, and at 40 ° C. or more. Therefore, the preheating temperature is set to 30 ° C. by the start of operation of the fuel cell 4 and to 40 ° C. by the end of the operation. As described above, the time required for preheating can be determined by the heat input to the past hydrogen storage device 3 of the cold heat source 6, the alloy temperature indicating the preheating temperature, the specific heat of the hydrogen storage alloy, and the outside air temperature.

As described above, the power supply system 100 according to the present embodiment includes the renewable energy power generation device 1, the hydrogen production device 2, the hydrogen storage device 3, the fuel cell 4, the cold heat source 6, and the control device 8. And.
The renewable energy power generation apparatus 1 has a renewable energy power supply that supplies renewable energy to the customer load 5, and outputs surplus power of the renewable energy.
The hydrogen production apparatus 2 produces hydrogen using the surplus power output from the renewable energy power generation apparatus 1.
The hydrogen storage device 3 stores the hydrogen produced by the hydrogen production device 2 in a hydrogen storage alloy by storing the hydrogen, and releases the hydrogen stored in the hydrogen storage alloy.
The fuel cell 4 generates power using hydrogen released by the hydrogen storage device 3 and supplies the generated power to the customer load 5.
The cold heat source 6 gives a precooling temperature to the hydrogen storage device 3 at a predetermined time when the hydrogen storage device 3 occludes hydrogen in the hydrogen storage alloy, and the hydrogen storage device at a predetermined time when the hydrogen storage device 3 releases hydrogen. Give preheating temperature to 3.
The control unit 8 creates an operation plan of the hydrogen storage unit 3 representing the hydrogen storage amount and the hydrogen release amount at a predetermined time of the hydrogen storage unit 3, and based on the operation plan of the hydrogen storage unit 3, precooling the cold heat source 6. The temperature or preheating temperature is determined, and the determined precooling or preheating temperature is provided to the cold heat source 6.

In the present invention, the control device 8 creates an operation plan of the hydrogen storage device 3 representing the hydrogen storage amount and the hydrogen release amount at a predetermined time of the hydrogen storage device 3. Further, the control device 8 determines the pre-cooling temperature or the preheating temperature of the cold heat source 6 based on the operation plan of the hydrogen storage device 3 and performs control to give the determined pre-cooling temperature or the preheating temperature to the cold heat source 6.
Thus, according to the present invention, even if a hydrogen storage alloy having a composition that requires temperature control is used, the amount of hydrogen can be stored / released at a predetermined time, thereby minimizing precooling and preheating heat / time. keep it can, it is possible to achieve energy saving.

Hereinafter, another embodiment of the power supply system 100 of the present embodiment shown in FIG. 1 will be described with reference to FIGS. 6 and 7.
In the description of the embodiment of the power supply system 100 described above, precooling and preheating are performed with the cold heat source 6 for precooling and preheating. However, in the present embodiment, the power supply system 100 is an energy-saving power supply system. The power supply system is capable of performing precooling and preheating by using warm water (hot water) generated from the fuel cell 4 or heat exchange with a building.
FIG. 6 is a thermal system diagram in the present power supply system. 6, the same parts as in FIG. 1 are given the same reference numerals, and the description thereof will be omitted as appropriate.
As shown in FIG. 6, the power supply system includes a hydrogen storage device 3, a cold heat source 6 a for cooling the hydrogen storage device 3, a heat exchanger 11 for recovering the warm water of the fuel cell 4, and the fuel cell 4. , Heat exchanger 12 for exchanging heat with the cold water system of the building, the hot water storage tank 6 b, the heat exchanger 13 for exchanging heat with the hot water storage tank 6 b, the pumps 21 to 23, and the heat medium flow path And the valves 31 to 38.
Here, as shown in FIG. 6, heating and cooling are performed using the cold heat source 6 in the power supply system 100 shown in FIG. 1, but in the present power supply system, the cold heat source 6a is used as a cold heat source. and a fuel cell 4 and the hot water storage tank 6b as. That is, the present power supply system uses the discharged hot water of the fuel cell 4 as a heat source, and has a hot water storage tank 6b for hot water supply when the fuel cell 4 is stopped.

  Hereinafter, the operation method for each operation in the present power supply system will be described in detail with reference to FIG. FIG. 7 is a diagram for explaining each operating condition and the open / close state of the valve in the power supply system. FIG. 7 shows the valves 31 to under the respective conditions A to H of the presence or absence of building connection, the cooling / heating of the hydrogen storage device 3, the ON / OFF of the fuel cell 4 operation, and the residual heat storage state of the hot water storage tank 6b. 38 shows ON (open state) and OFF (closed state) of 38. Here, the presence or absence of the building connection indicates the condition whether heat exchange with the building is performed (present) or not performed (absent). Further, the cooling and heating of the hydrogen storage device 3 indicate the conditions under which the hydrogen storage device 3 is cooled (cooling) or heated (heating). Further, ON / OFF of the operation of the fuel cell 4 indicates the condition whether the fuel cell 4 is operated (ON) or not operated (OFF). Further, the residual heat storage state of the hot water storage tank 6b represents the condition of whether there is residual heat storage (-) or whether there is no residual heat storage and the state of full livestock (full).

  First, when the hydrogen storage device 3 is cooled, the cold heat source 6a is operated, and the cold water from the cold heat source 6a is supplied to the hydrogen storage device 3. This is performed under the condition shown in the operating condition A of FIG. That is, cold water from the cold heat source 6 a is supplied to the hydrogen storage device 3 through the valve 35 and the valve 37 which are on while the fuel cell 4 is in the OFF state.

  Next, when the hydrogen storage device 3 is heated, hot water is preferentially supplied to the hydrogen storage device 3 from the hot water storage tank 6 b. This is performed under the condition shown in the operating condition B of FIG. That is, when the fuel cell 4 is off, the valve 37 is turned off and the valve 38 is turned on, whereby hot water is supplied from the hot water storage tank 6 b to the hydrogen storage device 3.

  Subsequently, the hydrogen storage device 3 is heated, hydrogen release is started, and after the fuel cell 4 is operated, hot water is supplied to the hydrogen storage device 3 by the fuel cell 4. At this time, heat storage is simultaneously performed also in the hot water storage tank 6 b via the heat exchanger 11. This is performed under the condition shown in the operating condition C of FIG. That is, when the fuel cell 4 changes from the OFF state to the ON state of the condition shown in the operating condition B, the valve 35 is turned off and the valve 36 is turned on, whereby the hot water from the fuel cell 4 is turned on. While being supplied to the hydrogen storage device 3 through the valve 38, heat storage is simultaneously performed also in the hot water storage tank 6b through the heat exchanger 11.

Next, when the hot water storage tank 6b is fully stored and the heat exchanger inlet temperature of the fuel cell 4 exceeds a predetermined value, cooling by the cold heat source 6a is also performed. This is performed under the conditions shown in the operating condition D in FIG. That is, when the fuel cell 4 is ON, the valve 37 is turned ON and the valve 38 is turned OFF, whereby the cold water from the cold heat source 6a is supplied to the hydrogen storage device 3 via the ON valve 37. .
The above is the operation of the power supply system when the heat exchange with the building is not performed, and when the heat exchange with the building is possible, as shown in the operating conditions E to H in FIG. Heat exchange is performed via the heat exchanger 12, and the hydrogen storage alloy is cooled, heated, and stored in the hot water storage tank 6b.

As described above, according to the present power supply system, the cold heat source 6 supplies the hydrogen storage device 3 with the pre-cooling temperature, and the heat source providing the hydrogen storage device 3 with the preheating temperature. The heating and heat source includes a fuel cell 4 and a hot water storage tank 6b that provides a preheating temperature to the hydrogen storage device 3 when the fuel cell 4 is stopped.
Thus, according to the present invention, since preheating and precooling can be performed using waste water (hot water) generated by the fuel cell 4 and the hot water storage tank 6b or heat exchanged with a building, energy saving can be achieved.

  The control device 8 in the embodiment described above may be realized by a computer. In that case, a program for realizing this function may be recorded in a computer readable recording medium, and the program recorded in the recording medium may be read and executed by a computer system. Here, the “computer system” includes an OS and hardware such as peripheral devices. The term "computer-readable recording medium" refers to a storage medium such as a flexible disk, a magneto-optical disk, a ROM, a portable medium such as a ROM or a CD-ROM, or a hard disk built in a computer system. Furthermore, “computer-readable recording medium” dynamically holds a program for a short time, like a communication line in the case of transmitting a program via a network such as the Internet or a communication line such as a telephone line. It may also include one that holds a program for a certain period of time, such as volatile memory in a computer system that becomes a server or a client in that case. Further, the program may be for realizing a part of the functions described above, or may be realized in combination with the program already recorded in the computer system. It may be realized using a programmable logic device such as an FPGA (Field Programmable Gate Array).

  As mentioned above, although one embodiment of this invention was described in detail with reference to drawings, a specific structure is not restricted to the above-mentioned thing, Various design changes etc. in the range which does not deviate from the summary of this invention It is possible to

  DESCRIPTION OF SYMBOLS 1 ... Renewable energy power generation apparatus, 2 ... Hydrogen production apparatus, 3 ... Hydrogen storage apparatus, 4 ... Fuel cell, 5 ... Demand household load, 6 ... Cold heat source, 6a ... Cold heat source, 6b ... Hot water storage tank, 7 ... Measurement Device, 8 ... Control device, 100 ... Power supply system

Claims (6)

A renewable energy power generation apparatus having a renewable energy power supply that supplies renewable energy to a consumer load, and outputting surplus power of the renewable energy;
A hydrogen production apparatus for producing hydrogen using surplus power output from the renewable energy power generation apparatus;
A hydrogen storage device which stores hydrogen produced by the hydrogen production device by causing the hydrogen storage alloy to be stored, and releases the hydrogen stored in the hydrogen storage alloy;
A fuel cell that generates power using hydrogen released by the hydrogen storage device and supplies the generated power to the customer load;
The hydrogen storage device provides a precooling temperature to the hydrogen storage device at a predetermined time when the hydrogen storage device occludes hydrogen, and the hydrogen storage device preheats the hydrogen storage device at a predetermined time of releasing hydrogen. Cold heat source to give temperature,
An operation plan of the hydrogen storage device representing a hydrogen storage amount and a hydrogen release amount at a predetermined time of the hydrogen storage device is created, and the pre-cooling temperature or the preheating of the cold heat source based on the operation plan of the hydrogen storage device. A controller that determines a temperature and applies the determined pre-cooling temperature or the preheating temperature to the cold heat source;
Power supply system comprising: The controller is
The surplus power is estimated from the power prediction value of the customer load and the prediction value of the renewable energy, and the operation of the hydrogen production apparatus is performed from the estimated value of the surplus power and the power prediction value of the customer load Create a plan, and based on the prepared operation plan of the hydrogen production apparatus, determine the hydrogen storage capacity in the operation plan of the hydrogen storage apparatus,
An operation plan of the fuel cell is created from the hydrogen storage amount of the hydrogen storage device and the actual power value of the customer load, and the operation plan of the hydrogen storage device is created based on the created operation plan of the fuel cell Determine the amount of hydrogen released
The power supply system according to claim 1. The controller is
The pre-cooling temperature and the preheating temperature are determined based on a PCT curve showing the relationship between the hydrogen storage amount of the hydrogen storage alloy and the pressure and temperature.
The power supply system according to claim 1 or 2. The control device is configured to indicate a time during which the cold heat source gives the cold temperature or the preheating temperature to the cold heat source, an amount of heat input to the hydrogen storage device in the past by the cold heat source, an alloy temperature indicating the cold temperature or the preheating temperature is determined by the specific heat and the ambient air temperature of the hydrogen storage alloy,
Power supply system as claimed in any one claims 1 to 3. The cold heat source is
The heat source is divided into a cold heat source which gives the precooling temperature to the hydrogen storage device, and a heat source which gives the preheating temperature to the hydrogen storage device.
The heat source includes the fuel cell and a hot water storage tank that provides the preheating temperature to the hydrogen storage device when the fuel cell is stopped.
Power supply system as claimed in any one claims 1 to 4. A renewable energy power generation process comprising a renewable energy power supply for supplying renewable energy to a consumer load, and outputting surplus power of the renewable energy;
A hydrogen production process in which a hydrogen production apparatus produces hydrogen using surplus power output from the renewable energy power generation apparatus;
A hydrogen storage device stores hydrogen produced by the hydrogen production device by causing the hydrogen storage alloy to store hydrogen, and releases hydrogen stored in the hydrogen storage alloy and releases hydrogen stored in the hydrogen storage alloy. Storage process,
A power supply step of generating electric power using hydrogen released by the hydrogen storage device, and supplying the generated electric power to the customer load;
The hydrogen storage device provides a precooling temperature to the hydrogen storage device at a predetermined time when the hydrogen storage device stores hydrogen in the hydrogen storage alloy, and the hydrogen storage device at a predetermined time when the hydrogen storage device releases hydrogen. Heating and cooling steps to give a preheating temperature to the
The control device creates an operation plan of the hydrogen storage device representing a hydrogen storage amount and a hydrogen release amount at a predetermined time of the hydrogen storage device, and based on the operation plan of the hydrogen storage device, the precooling of the cold heat source A control step of determining the temperature or the preheating temperature and applying the determined precooling temperature or the preheating temperature to the cold heat source;
Method of controlling a power supply system comprising:

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