JPH11283633A - Hydrogen fuel power generating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate an electric power demand during a midnight time period when the electric power demand is little while to suppress the electric power demand in the daytime when the electric power demand is much. SOLUTION: Midnight power is supplied from a distribution panel 12 for midnight power during only a predetermined midnight time period. A controller 66 converts the midnight power into a DC to supply it to an electrolytic cell 18 when a pressure sensor 38 detects a hydrogen pressure lower than a target value during the midnight time period. The electrolytic cell 18 supplies the DC between electrodes 22, 24, to electrolyze water into hydrogen. The hydrogen discharged to a negative electrode side air chamber 20A inside the electrolytic cell 18 is compressed by a compressor 30, to be filled in a hydrogen storing tank 36. In a fuel cell device 42, the hydrogen supplied from the hydrogen storing tank 36 is reacted with oxygen in the air, thereby generating electric energy corresponding to an outside load.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydrogen fuel power generation system that stores hydrogen obtained by electrolyzing water and uses the hydrogen as fuel to generate electric energy according to an external load.

[0002]

2. Description of the Related Art FIG. 6 is a load curve graph showing an example of a relationship between a power load and time. The wide-area power load is shown in FIG.
As shown in (1), the power varies greatly depending on the time of day, but the electric power company must prepare facilities capable of coping with the peak load of electric power. As a result, the operation rate of the power generation equipment such as the thermal power generation equipment is significantly reduced in the nighttime period when the demand for electricity is small, particularly in the late night hours after 23:00. Under such circumstances, capital investment for coping with the peak load becomes excessive and the power generation equipment cannot be operated with high efficiency throughout the day, so it is difficult to reduce the power cost. CO that causes global warming
₍₂ ) To reduce the amount of generated gas, it is necessary to reduce the power generation ratio by thermal power generation, but in nuclear power generation to compensate for this, power generation cannot be stopped according to the power load.

In recent years, in order to solve the above-mentioned problem caused by the difference in electricity demand between day and night, there is a social demand for shifting electricity demand to a late-night time zone. As an apparatus developed in response to such a request, for example, there is an electric water heater using midnight power. This electric water heater heats water with inexpensive midnight power supplied during the late night hours (for example, from 23:00 to 7:00 the next day) and stores it in the tank as hot water. It uses hot water or the heat energy of the hot water during other times.

[0004]

However, since electric water heaters that use midnight electric power are limited to use of hot water itself, cooling and heating, etc., it is difficult to equalize the power demand in one day. It contributes only very limitedly.

SUMMARY OF THE INVENTION In view of the above facts, an object of the present invention is to stimulate a large power demand in an energy storage time zone where the power demand is small, such as a late night time zone, and to suppress the power demand in a time zone other than the energy storage time zone. It is an object of the present invention to provide a power generation system using hydrogen fuel.

[0006]

According to a first aspect of the present invention, there is provided a hydrogen fuel power generation system, comprising: a hydrogen generation unit configured to generate hydrogen by electrolyzing water using electric energy; and a hydrogen storage unit configured to store the hydrogen generated by the hydrogen generation unit. Means, power generation means for generating electric energy by using hydrogen supplied from the hydrogen storage means as fuel, and enabling the hydrogen generation means to operate only during a predetermined energy storage time zone. Control means for controlling the operation of the hydrogen generation means so that a fixed amount of hydrogen is stored.

[0007] According to the hydrogen fuel power generation system having the above configuration, a predetermined amount of hydrogen is stored in the hydrogen storage means during the energy storage time zone in one day, and the power generation means is switched from the hydrogen storage means during the time period other than the energy storage time zone. Since the hydrogen can generate electric energy according to the external load, the power demand in the energy storage time zone can be increased and the power demand in the time zone other than the energy storage time zone can be reduced. Therefore, if the energy storage time zone is set within a time zone where the power demand is low, such as a late night time zone, the difference in power demand between day and night can be reduced.

Here, the control means controls the operation of the water generating means in accordance with the capacity of the hydrogen storage means, the prediction of the amount of hydrogen (electric energy) consumed per day, and the like. For example, when the capacity of the hydrogen storage means is smaller than the capacity of the hydrogen generation means, the control means stops the operation of the hydrogen generation means when the hydrogen storage means is full, and the capacity of the hydrogen storage means is reduced. When the capacity of the hydrogen generating means is sufficiently large, the operation of the hydrogen generating means is stopped at the time when the hydrogen consumed per day is stored. When hydrogen is consumed after storing a predetermined amount of hydrogen in the hydrogen storage means in the energy storage time zone, the control means operates the hydrogen generation means so that the consumed hydrogen is replenished to the hydrogen storage means. You may do so.

The hydrogen fuel power generation system according to claim 2 is
2. The hydrogen fuel power generation system according to claim 1, wherein the energy storage time zone is set in a midnight time zone in which a wide-area power load is maintained near a base level.

[0010] According to the hydrogen fuel power generation system having the above configuration, the energy demand is set outside the energy storage time zone by setting the energy storage time zone to the midnight time zone in which the wide-area power load is maintained near the base level. Can be shifted from the time zone to the energy storage time zone, so that the power demand in one day can be leveled. Here, at midnight,
Since it is expected that inexpensive midnight power will be supplied compared to other time zones, it is possible to generate hydrogen at low cost by using this midnight power, and the user The total cost to be paid can be reduced.

A hydrogen fuel power generation system according to claim 3 is
The hydrogen fuel power generation system according to claim 1 or 2,
The power generation means has a fuel cell that generates electric energy by reacting hydrogen supplied from the hydrogen storage means with oxygen in the air.

According to the hydrogen fuel power generation system having the above configuration, the fuel cell reacts hydrogen with oxygen in the air to generate electric energy, so that the user can use the electric energy generated by the fuel cell. Here, since the fuel cell uses hydrogen as fuel, electric energy can be generated without generating harmful substances such as CO ₂ and NO _X. Further, as compared with the case where power is generated using an internal combustion engine and a generator, when the amount of generated electric energy is increased or decreased in response to a load change, it is possible to maintain a high power generation efficiency and to reduce the noise level.

[0013] The hydrogen fuel power generation system according to claim 4 is
The hydrogen fuel power generation system according to claim 1 or 2,
The power generation means includes a power generator and an internal combustion engine that drives the power generator by explosively burning hydrogen supplied from the hydrogen storage means.

According to the hydrogen fuel power generation system having the above configuration, the user can use the electric energy generated by the generator when the internal combustion engine drives the generator using hydrogen as fuel. Here, since the internal combustion engine uses hydrogen as fuel, electric energy can be generated without generating harmful substances such as CO ₂ and NO _X.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

(Configuration of First Embodiment) FIG. 1 shows a hydrogen fuel power generation system according to a first embodiment of the present invention. The hydrogen fuel power generation system 10 includes a hydrogen generator 14 that is supplied with AC 200 V from a switchboard 12 for midnight power.
It has. This hydrogen generator 14 includes an AC / DC converter 16 and an electrolytic cell 18. The electrolytic cell 18 includes a water storage section 20 for storing water serving as a hydrogen source, and a pair of electrodes 22 and 24 are immersed in the water in the water storage section 20. Further, a water level sensor 25 is installed in the water storage unit 20 at a position corresponding to a predetermined lower limit water level. When the water level is equal to or higher than the lower limit water level, the electrodes 22 and 24 are surely immersed in water for a certain length or more.
Here, the water level sensor 25 outputs a water replenishment signal when the water level in the water storage unit 20 falls below the lower limit position.

A water supply pipe 28 in which an electromagnetic on-off valve 26 is disposed and a compressor 30 and a hydrogen supply pipe 32 are connected in the middle of the pipe to the electrolytic cell 18. The water supply pipe 28 connects a water supply tank 34 arranged above the electrolytic cell 18 to the water storage section 20 of the electrolytic cell 18, and the hydrogen supply pipe 32 is connected to the negative air chamber 20 </ b> A provided on the water surface in the water storage section 20. Are connected to the hydrogen storage tank 36. This hydrogen storage tank 3
6 is provided with a pressure sensor 38 for detecting the hydrogen pressure in the tank.

The hydrogen storage tank 36 is connected to a fuel cell device 42 by a hydrogen supply pipe 40 in which an electromagnetic switching valve 39 is disposed. The fuel cell device 42 includes a pressure reducing valve 4 that reduces the pressure of hydrogen supplied from the fuel cell 44 and the hydrogen storage tank 36.
5, fan 46 for supplying air to fuel cell 44, DC /
A DC converter 48 and a DC / AC converter 50 are provided. The water supply tank 34 includes an electromagnetic on-off valve 52,
A water supply pipe 56 in which a pump 54 and a water treatment device 55 are arranged
Is connected to the fuel cell 44. Therefore, when the electromagnetic switching valve 39 is opened, the hydrogen charged in the hydrogen storage tank 36 is reduced to a predetermined pressure by the pressure reducing valve 45 and supplied to the fuel cell 44. When the pump 54 is driven at the same time when the electromagnetic opening / closing valve 52 is opened, the water stored in the water supply tank 34 is supplied to the fuel cell 44 through the water treatment device 55. The water treatment device 55 is filled with an ion exchange resin, and removes metal ions from water sent from the pump 54 and supplies the water to the fuel cell 44.

The power conditioner 58 includes a power supply line 60.
Is connected to the DC / AC converter 48 of the fuel cell device 42, and is connected to the distribution panel 64 for general power by the power supply line 62. Power conditioner 58
Supplies electric power according to an external load by an electric device or the like connected to the control device 66 for controlling the entire system and the hydrogen fuel power generation system 10. Here, the power conditioner 58 replenishes the shortage with the power from the switchboard 64 and supplies power when the power is insufficient with the hydrogen fuel power generation system 10 alone.

Here, the switchboard 12 for late-night power has a built-in circuit breaker (not shown), and the circuit breaker is opened during a time period other than the midnight time period determined by a contract between the power company and the user. The power supply is cut off at midnight, and the circuit breaker is closed at midnight to supply power according to the load of the hydrogen fuel power generation system. On the other hand, the power distribution board 64 for general power can supply power in all time periods of the day. Therefore, even if the fuel cell device 42 becomes unable to generate power for some reason or its capacity is reduced, the hydrogen fuel power generation system 10 maintains the power supply according to the external load. In the following description according to the present embodiment, the midnight time zone is from 23:00 to 7:00 the following day.

(Operation of First Embodiment) The operation and operation of the hydrogen fuel power generation system 10 of the present embodiment configured as described above will be described.

First, a control routine relating to hydrogen generation and hydrogen storage by the control device 66 in the midnight time zone will be described with reference to FIG. When the midnight power supply from the switchboard 12 is started in step 102, it is determined in step 104 whether the hydrogen pressure detected by the pressure sensor 38 is lower than the target pressure. At this time, if the hydrogen pressure is lower than the target pressure, it is determined in step 106 whether the water supply signal from the water level sensor 25 is on or off. If the hydrogen pressure is higher than the target pressure, the process proceeds to step 116. Move on to processing.

If the water replenishment signal is on at step 106, the electromagnetic on / off valve 26 is opened at step 108 to supply water from the water supply tank 34 to the water storage section 20 of the electrolytic cell 18, and a predetermined amount of water is supplied to the water storage section 20. At the timing when water is supplied, the electromagnetic on-off valve 26 is returned to the closed state. At this time, the completion of water supply is determined even if a certain time has elapsed since the water level sensor 25 was turned off after the start of water supply, or a water level sensor is provided at a position corresponding to the upper limit water level separately from the water level sensor 25, The determination may be made based on a signal from the water level sensor.

If the water supply signal is off at step 106 and if the water supply is completed at step 108, the AC / DC converter 16 of the hydrogen generator 14 is turned on at step 110, and the compressor is synchronized with this. 3
Drive 0. When the AC / DC converter 16 is turned on, a direct current flows between the pair of electrodes 22 and 24.
As a result, the water in the water storage unit 20 is electrolyzed, and hydrogen is released to the negative-side gas chamber 20A and oxygen is released to the positive-side gas chamber 20B. The hydrogen released into the gas chamber 20A is compressed by the compressor 30 through the hydrogen supply pipe 32 and charged into the hydrogen storage tank 36.

In step 112, it is determined from the signal from the pressure sensor 38 whether or not the hydrogen pressure in the hydrogen storage tank 36 has reached the target pressure. At this time, if the hydrogen pressure is equal to or higher than the target pressure, the AC / DC converter 16 is turned off in step 114, the compressor is stopped in synchronism therewith, and the process proceeds to step 116, where the hydrogen pressure is lower than the target pressure. In this case, while the AC / DC converter 16 is turned on and the compressor is driven, step 11 is performed.
Move to 6.

In step 116, it is determined whether or not the midnight power supply from the switchboard 12 has been stopped. If the midnight power supply has been stopped, the control routine relating to hydrogen generation and hydrogen storage is terminated. Is continued, the routine returns to step 104.

In the control routine described above, the hydrogen storage tank 3 is controlled by the hydrogen pressure detected by the pressure sensor 38.
6 is calculated. The target value of the hydrogen pressure is determined by the allowable pressure of the target hydrogen storage tank 36 of the hydrogen pressure charged to the hydrogen storage tank 36 and the compressor 3
The capacity may be set according to the apparatus capacity such as the compression capacity of 0, or if the capacity of the hydrogen storage tank 36 has a sufficient margin with respect to the hydrogen consumption by the fuel cell apparatus 44, the time other than the midnight hours It may be set in correspondence with the predicted value of the hydrogen consumption in the time zone. In the control routine shown in FIG. 2, the control device 66 determines the time zone in which the hydrogen generator 14 can be operated by turning on / off the midnight power, but sets the timer to the midnight time zone in advance. The time zone in which the hydrogen generator 14 can be operated may be determined based on a signal from the timer.

On the other hand, the fuel cell device 42 generates electric energy using the hydrogen supplied from the hydrogen storage tank 36 as a fuel during operation. The control device 66 controls the fuel cell device 42
During the operation of, the electromagnetic on-off valves 39 and 52 are opened and the pump 54 and the fan 46 are driven. As a result, water from which metal ions have been removed and hydrogen reduced to a predetermined pressure are supplied to the anode-side air chamber in the fuel cell 44, and air is supplied to the cathode-side air chamber by the fan 46. Thus, the fuel cell 44 generates DC electric energy by reacting hydrogen with oxygen in the air based on the interposition of water. The DC electric energy is converted to a predetermined voltage by the DC / DC converter 48, then converted to 100 V AC by the DC / AC converter 50, and supplied to the power conditioner 58. At this time, the fuel cell 44 consumes hydrogen that is substantially proportional to the generated current. When the fuel cell 44 is driven, it is necessary to supply water from which metal ions have been removed. In order to suppress the amount of water supplied from the water supply tank 34, a certain amount of water supplied from the water supply tank 34 to the fuel cell device 42 is stored. Alternatively, a water circulation mechanism for circulating this to the fuel cell 44 may be provided.

The controller 66 stops the operation of the fuel cell device 42 when there is no need to generate electric energy from the fuel cell 44, and closes the solenoid valves 39 and 52 when the operation is stopped. Then, the drive of the fan 46 is stopped.

FIG. 3 shows the relationship between hydrogen generation and hydrogen consumption when the fuel cell device 42 is operated continuously. In this case, as shown in FIG. 3, the hydrogen generator 14 generates substantially constant hydrogen per hour during the midnight hours from 23:00 to 7:00 the next day, and stores the hydrogen in the hydrogen storage tank 36. However, even during the midnight hours, when the hydrogen pressure in the hydrogen storage tank 36 becomes higher than the target pressure, the operation of the hydrogen generator 14 is stopped.

On the other hand, the fuel cell device 42 is operated continuously throughout the day, and the fuel cell 44 consumes hydrogen substantially proportional to the generated current. Although the hydrogen consumption of the fuel cell 44 decreases during the midnight hours as shown in FIG. 3, it is necessary to supply control power to the control device 66 when the hydrogen fuel power generation system 10 is operating. It does not become 0 even when power is not supplied to the.

FIG. 4 shows the relationship between hydrogen generation and hydrogen consumption when the fuel cell device 42 is operated intermittently. Also in this case, as shown in FIG. 4, the hydrogen generator 14 continuously generates substantially constant hydrogen per hour during the midnight hours from 23:00 to 7:00 on the following day, and stores the hydrogen in the hydrogen storage tank 36. To store. However, the hydrogen storage tank 36
When the hydrogen pressure in the chamber becomes equal to or higher than the target pressure, the operation of the hydrogen generator 14 is stopped until midnight on the following day.

On the other hand, the fuel cell device 42 is continuously operated during a time period other than the midnight time period, and the fuel cell 44 consumes hydrogen substantially proportional to the generated current. Therefore, the fuel cell 4
No. 4 consumes hydrogen only in a time zone other than the midnight time zone as shown in FIG. Further, the control power required also in the late night time zone is supplied from the switchboard 64 to the control device 66 through the power conditioner 58. However, when it is recognized that the midnight power is used as the control power, 200 V AC from the switchboard 12 may be transformed and supplied to the control device 66.

According to the hydrogen fuel power generation system 10 according to the present embodiment described above, a predetermined amount of hydrogen is stored in the hydrogen storage tank 36 during the midnight hours of a day, and the fuel cell is stored at times other than the midnight hours. The device 42 is a hydrogen storage tank 36
Generates electric energy according to the external load using hydrogen supplied from the power supply, thereby increasing the power demand in the late night hours when the power demand is low and reducing the power demand in the daytime hours when the power demand is high (power peak cut )
Since the power demand can be shifted from a time zone other than the midnight time zone to the midnight time zone, the power demand in one day can be leveled. Here, it is predicted that a contract with the power company will make it possible to supply inexpensive late-night power in the late-night hours, so that using this late-night power will lower the cost of hydrogen. Can be generated, and the total cost to be paid by the user for the electric energy can be reduced.

In this embodiment, only the case where a polymer electrolyte fuel cell is used as the fuel cell 44 has been described.
As long as it generates power using hydrogen as a fuel, for example, a fuel cell of a phosphoric acid type, a molten carbonate type, a solid electrolyte type, an alkaline type or the like can also be applied as a power generating element in the system.

(Configuration of the Second Embodiment) FIG. 5 shows a hydrogen fuel power generation system according to a second embodiment of the present invention. In the hydrogen fuel power generation system 70 according to the second embodiment, the same members as those of the hydrogen fuel power generation system 10 according to the first embodiment described with reference to FIG. Is omitted.

The hydrogen fuel power generation system 70 of the present embodiment differs from the hydrogen fuel power generation system 10 of the first embodiment in that a power generator 72 is provided instead of the fuel cell device 42, and the power generator 72 converts hydrogen. Generating electric energy as fuel. The power generation device 72 includes an internal combustion engine 74, a DC generator 76, a DC / DC converter 78, and a DC / AC converter 80. The hydrogen storage tank 36 is connected to the internal combustion engine 74 by a hydrogen supply pipe 40 in which a flow control valve 82 is disposed.

(Operation of the Second Embodiment) The operation and operation of the hydrogen fuel power generation system 70 of the present embodiment configured as described above will be described. The control routine for hydrogen generation and hydrogen storage by the control device 66 in the late night time zone is the same as that of the hydrogen fuel power generation system 10 of the first embodiment, and thus the description is omitted.

The power generator 72 operates during the operation of the hydrogen storage tank 3.
The electric energy is generated using the hydrogen supplied from 6 as a fuel. The control device 66 supplies a predetermined amount of hydrogen to the internal combustion engine 74 by adjusting the opening of the flow control valve 82 during operation of the power generation device 72. The internal combustion engine 74 explosively combusts the hydrogen to convert the pressure energy into rotational motion of the drive shaft and rotates a DC generator 76 connected to the drive shaft. The DC generator 76 generates DC electric energy substantially proportional to the rotation speed. This electric energy is converted to a predetermined voltage by the DC / DC converter 78, and then converted to DC / DC.
The power is converted into 100 V AC by the AC converter 80 and supplied to the power conditioner 58. At this time, the DC generator 76 changes the rotation speed according to the amount of hydrogen supplied from the hydrogen storage tank 36. The control device 66 detects the rotation speed of the internal combustion engine 74 based on a pulse signal proportional to the rotation speed output from the DC generator 76, and feeds back the opening of the flow control valve 80 so that the rotation speed becomes a target value. Control.

However, since the rotational band in which the internal combustion engine 74 can efficiently convert hydrogen to kinetic energy is limited to a narrow range, when the external load fluctuates greatly, the internal combustion engine 74 is driven at a rotational speed corresponding to the external load. May not be controlled. Therefore, when the fluctuation of the external load is large,
For example, if a secondary battery is installed between the DC / DC converter 78 and the DC / AC converter 80, the internal combustion engine 74 can always be rotated within a high-efficiency rotation band.

According to the hydrogen fuel power generation system 70 according to the present embodiment described above, a predetermined amount of hydrogen is stored in the hydrogen storage tank 36 during the midnight hours of a day, and power is generated at times other than the midnight hours. The device 72 generates electric energy according to the external load by the hydrogen supplied from the hydrogen storage tank 36, thereby increasing the power demand in the late night hours when the power demand is small, and also increasing the power demand in the hours other than the late night hours. Therefore, the power demand can be shifted from a time zone other than the late night time zone to the late night time zone, and the power demand in one day can be leveled. Here, during the late night hours, a contract with a power company makes it possible to supply inexpensive midnight power compared to other time zones, so if this midnight power is used, hydrogen can be generated at low cost. Becomes possible,
It is possible to reduce the total cost of the user for the electric energy.

In the hydrogen fuel power generation systems 10 and 70 of the present embodiment described above, the hydrogen generated by the hydrogen generator 14 is compressed by the pump 30 and the hydrogen storage tank 36 is compressed.
Although the storage is performed in a pressurized state, it is also possible to install a hydrogen storage alloy in the hydrogen storage tank and absorb hydrogen with the hydrogen storage alloy. As the hydrogen storage alloy, for example, a known LaNi ₅ alloy, FeTi alloy, magnesium alloy or the like can be applied. These hydrogen storage alloys take in a large amount of hydrogen as hydride under appropriate temperature and pressure conditions, and release hydrogen to the outside by reducing the pressure or heating. If this hydrogen storage alloy is used, the size of the hydrogen storage tank can be reduced even when storing the same amount of hydrogen as the hydrogen storage tank 36.

[0043]

As described above, according to the hydrogen fuel power generation system of the present invention, a large power demand is evident during an energy storage time zone where the power demand is small, such as a late-night time zone (power peak shift), and energy storage is performed. The power demand in a time zone other than the time zone, particularly in the daytime, can be suppressed (power peak cut). Further, it is effective in reducing the cooling demand at the peak of the summer season, and is effective as a power load leveling measure.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a hydrogen fuel power generation system according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a control routine relating to hydrogen generation and hydrogen storage by the control device according to the first embodiment of the present invention.

FIG. 3 is a graph showing a relationship between hydrogen generation and hydrogen consumption when the fuel cell device is continuously operated in the hydrogen fuel power generation system according to the first embodiment of the present invention.

FIG. 4 is a graph showing a relationship between hydrogen generation and hydrogen consumption when the fuel cell device operates intermittently in the hydrogen fuel power generation system according to the first embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a hydrogen fuel power generation system according to a second embodiment of the present invention.

FIG. 6 is a load curve graph showing an example of a relationship between a change in power load and time in one day.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Hydrogen fuel power generation system 14 Hydrogen generator (hydrogen generation means) 18 Electrolyzer 30 Compressor (hydrogen storage means) 32 Hydrogen supply pipe (hydrogen storage means) 36 Hydrogen storage tank (hydrogen storage means) 42 Fuel cell device (electric power generation) Means) 44 Fuel cell (polymer electrolyte fuel cell) 66 Control device (control means) 70 Hydrogen fuel power generation system 72 Power generation device (power generation means) 74 Internal combustion engine 76 DC generator

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Nobuyoshi Nishizawa, 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. No.5-5 Sanyo Electric Co., Ltd. (72) Inventor Osamu Tajima 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (4)

[Claims] 1. A hydrogen generating means for electrolyzing water with electric energy to generate hydrogen, a hydrogen storing means for storing hydrogen generated by the hydrogen generating means, and using hydrogen supplied from the hydrogen storing means as fuel. An electric power generating means for generating electric energy; and controlling the operation of the hydrogen generating means so that the hydrogen generating means can be operated only during a predetermined energy storage time zone, and a predetermined amount of hydrogen is stored in the hydrogen storage means. A hydrogen fuel power generation system comprising: 2. The hydrogen fuel power generation system according to claim 1, wherein the energy storage time zone is set within a midnight time zone in which a wide-area power load is maintained near a base level. 3. The fuel cell according to claim 1, wherein the power generation unit includes a fuel cell that generates electric energy by reacting hydrogen supplied from the hydrogen storage unit with oxygen in air. Hydrogen fuel power generation system. 4. The power generation means includes: a power generator; and an internal combustion engine for driving the power generator by explosively burning hydrogen supplied from the hydrogen storage means. 3. The hydrogen fuel power generation system according to 1 or 2.