JP2005135738A - Control device for fuel cell system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device for a fuel cell system effectively and efficiently using surplus power to prevent reverse-power-flow to a network power source and to prevent stop of the fuel cell system. <P>SOLUTION: This control device has a hydrogen generator 1, a fuel cell 4 generating power by reacting the generated gas obtained by the hydrogen generator 1 and an oxidant gas, a DC/AC converter 5 converting DC power generated by the fuel cell 4 to AC power, a load power detection means 6, a controller 9 controlling a series of operation from startup to generation, a surplus power detection means 10 detecting that the load power actually consumed is smaller than the power outputted by the DC/AC converter 5 and a power storage means 11. The controller 9 can prevent the reverse power flow to a network power source by storing the power by the power storage means 11 to generate power stably and continuously when the surplus power detection means 10 detects that power exceeding the load power is generated and outputted even instantly. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a control device for a fuel cell system that performs power generation and exhaust heat recovery using a fuel cell.

As a conventional fuel cell system control device, there is a fuel cell power generation system that efficiently uses both electric power and heat (see, for example, Patent Document 1). FIG. 19 shows a conventional control apparatus for a fuel cell system described in Patent Document 1. In FIG.

In FIG. 19, a hydrogen generator 1 for generating a gas rich in hydrogen from a raw material fuel such as city gas and methanol and raw water necessary for a steam reforming reaction, and a blower fan for supplying air as an oxidant gas An air humidifier 3 for humidifying the supply air, a fuel cell 4 for generating electricity by reacting the product gas obtained in the hydrogen generator 1 and the oxidant gas from the air blower 2; The DC / AC converter 5 that converts the DC power generated by the fuel cell 4 into AC 200V, the load power detection means 6 that detects the load power actually consumed by the power load in the home, and the hydrogen generator 1 The exhaust heat recovery means 7 for recovering the respective exhaust heat from the generated gas obtained in the above, the oxidant gas from the blower 2 and the fuel cell 4, and the heat output amount actually output from the exhaust heat recovery means 7 Thermal load detection means 8 to detect , And a control unit 9 for controlling the series of operations from power generation startup.

Here, the controller 9 generates the generated gas from the blower 2 in accordance with the electric power load actually consumed in the home by the load electric power detection means 6 and in the exhaust heat recovery means 7 in the hydrogen generator 1. Respective exhaust heat is recovered from the oxidant gas and the fuel cell 4, and the product gas and oxidant gas rich in hydrogen according to the heat output amount actually output from the exhaust heat recovery means 7 by the thermal load detection means 8. The fuel cell 4 generates electric power and outputs electric power and heat.
Japanese Patent Laid-Open No. 2002-373687

  However, in the conventional configuration, the load power detection means detects the power load actually consumed in the home and performs load power follow-up operation to always generate power smaller than the load power amount. Since the actual amount of load power consumed is constantly changing and cannot follow the speed of the change, there is a problem that it may flow backward to the system power supply. Further, exhaust heat is recovered and hot water is heated with the heat, but there is a problem that the fuel cell system stops when the hot water temperature in the hot water storage tank reaches the upper limit.

  An object of the present invention is to solve the above-described conventional problems, and to prevent a reverse power flow to a system power source and to prevent a fuel cell system from stopping when a hot water temperature in a hot water storage tank reaches an upper limit. .

  In order to solve the above-described conventional problems, the control device for a fuel cell system according to the present invention has a power surplus detection means to detect a reverse power flow, and when detected, stores the power by the power storage means.

  As a result, reverse power flow can be prevented and the fuel cell system can be prevented from stopping.

  According to the control device for a fuel cell system of the present invention, even when the power load actually consumed in the home is smaller than the generated power, the surplus power is stored in the power storage means, and the reverse power flow to the system power supply is prevented. Power generation can be performed stably and continuously.

  The first invention is a hydrogen generator, a fuel cell that generates power by reacting a product gas obtained by the hydrogen generator and an oxidant gas, and direct current power generated by the fuel cell is converted into alternating current power. DC / AC converter, load power detection means for detecting load power at the actually consumed power load, controller for controlling a series of operations from the start of operation to power generation, and the actual amount of load power consumed The surplus power detection means for detecting when the power becomes smaller than the power output by the DC / AC converter and the power storage means, and the controller generates power exceeding the load power even instantaneously by the surplus power detection means. When it is detected that the output has been made, the power is stored by the power storage means, so that a reverse power flow to the system power supply can be prevented and power generation can be performed stably and continuously.

  The second invention is a hydrogen generator, a fuel cell that generates electricity by reacting a product gas obtained by the hydrogen generator and an oxidant gas, and direct current power generated by the fuel cell is converted into alternating current power. DC / AC converter, load power detection means for detecting load power at the actually consumed power load, controller for controlling a series of operations from the start of operation to power generation, and the actual amount of load power consumed Using surplus power detection means that detects when the power becomes smaller than the power output by the DC / AC converter, and the generated gas or oxidant gas obtained by the hydrogen generator and the exhaust heat from the fuel cell. A hot water storage tank for storing the obtained hot water, and a heating means connected to the hot water storage tank, and when the controller detects that the electric power exceeding the load power is generated and output instantaneously by the surplus power detection means, Heat is turned into heat by heating means For example, by heating the hot water of the hot water storage tank, it is possible to prevent the reverse power flow to the system power supply, it is possible to perform stable continuous power.

A third invention is a hydrogen generator, a fuel cell that generates electricity by reacting a product gas obtained by the hydrogen generator and an oxidant gas, and a product gas, an oxidant gas, and a fuel obtained by the hydrogen generator. The hot water storage tank that stores the hot water obtained using the exhaust heat from the battery, the controller that controls a series of operations from the start of operation to power generation, and the temperature of the hot water in the hot water storage tank has reached the upper limit. And a surplus heat detecting means for detecting hot water and a home appliance hot water supply means for supplying hot water to home appliances such as a dishwasher and a washing machine, and the controller limits the temperature of hot water in the hot water storage tank by the heat surplus detecting means. When it is detected that it has reached the vicinity, the hot water temperature can be lowered by supplying hot water to the home appliance by the home appliance hot water supply means, the stop of the fuel cell system can be prevented, and it has been restarted. To prevent energy loss in case Can.

A fourth invention is a hydrogen generator, a fuel cell that generates electricity by reacting a product gas obtained by the hydrogen generator and an oxidant gas, and a product gas, an oxidant gas, and a fuel obtained by the hydrogen generator. The hot water storage tank that stores the hot water obtained using the exhaust heat from the battery, the controller that controls a series of operations from the start of operation to power generation, and the temperature of the hot water in the hot water storage tank has reached the upper limit. The surplus heat detecting means for detecting the hot water and the domestic hot water supplying means for supplying hot water to each room in the home, and the controller detects that the temperature of the hot water in the hot water storage tank has reached the upper limit by the heat surplus detecting means. If detected, hot water is supplied to each room in the home by the hot water supply means in the home, so that the heat is released, so that the hot water temperature can be lowered, the fuel cell system can be prevented from being stopped, and restarted. Energy loss can be prevented .

  The fifth invention is a hydrogen generator, a fuel cell that generates electricity by reacting a product gas obtained by the hydrogen generator and an oxidant gas, and a product gas, an oxidant gas, and a fuel obtained by the hydrogen generator. The hot water storage tank that stores the hot water obtained using the exhaust heat from the battery, the controller that controls a series of operations from the start of operation to power generation, and the temperature of the hot water in the hot water storage tank has reached the upper limit. The heat surplus detection means for detecting the hot water and the hot water power conversion means for generating electric power using high temperature hot water, the controller detects that the temperature of the hot water in the hot water storage tank has reached the upper limit by the heat surplus detection means. If detected, hot water in the hot water tank can be lowered by converting hot water into electric power using hot water power conversion means so that it can be used as electric power, and preventing the fuel cell system from stopping Can do. Moreover, the energy loss at the time of restarting can be prevented. It can be used as electric power especially in summer when demand for hot water is low.

According to a sixth aspect of the invention, in particular, the fifth aspect of the invention further includes the second power storage means, and stores the power converted by the hot water power conversion means in the second power storage means, so that it can be used whenever necessary, particularly in summer. It can be used as electricity during periods of high demand.

  In the seventh invention, in particular, when the power storage means of the first, fifth, and sixth inventions generates and outputs power exceeding the load power amount and when high-temperature hot water is converted into power, the power is stored, By sharing power storage means into one, efficiency can be improved and cost reduction can be promoted.

An eighth invention is a hydrogen generator, a fuel cell that generates electricity by reacting a product gas obtained by the hydrogen generator and an oxidant gas, and a product gas, an oxidant gas, and a fuel obtained by the hydrogen generator. The hot water storage tank that stores the hot water obtained using the exhaust heat from the battery, the controller that controls a series of operations from the start of operation to power generation, and the temperature of the hot water in the hot water storage tank has reached the upper limit. The heat surplus detection means for detecting the heat and the heat storage means for storing the hot water as heat, and the controller uses the heat from the heat storage means as the heat energy at the next start-up, so that the next time of the fuel cell system Since it can be used effectively as thermal energy at the time of start-up, the start-up time can be greatly shortened.

  In particular, the ninth aspect of the invention includes an outside air temperature detecting means in addition to the control device for the fuel cell system of the eighth invention, and the controller is lowered to a temperature at which the system path is at risk of freezing by the outside air temperature detecting means. Is detected, the system path is preheated by releasing the heat stored in the heat storage means, so that troubles at the time of starting the fuel cell system due to freezing can be prevented.

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

(Embodiment 1)
FIG. 1 is a configuration diagram of a control device for a fuel cell system according to Embodiment 1 of the present invention. In FIG. 1, the same components as those in FIG.

  In FIG. 1, surplus power detection means 10 detects surplus power when the amount of load power actually consumed in the home becomes smaller than the power generated and output, and power storage means 11 is the surplus power detection means. 10 is used to store surplus power detected by the secondary battery 10 or a secondary battery or a storage battery. FIG. 2 is a diagram showing the driving operation, that is, the generated electric energy with respect to the transition of the daily load electric energy. The operation is controlled so that the generated electric energy always takes a small value with respect to the load electric energy. When the surplus power detection means 10 detects that the power exceeding the load power is generated and output instantaneously, the power storage means 11 subtracts the load power from the generated power. The excess power is stored.

  Here, the control operation will be described with reference to the flowchart of FIG. In step 1, the fuel cell system is activated, and a hydrogen-rich gas is generated in the hydrogen generator 1. If the temperature of each part reaches a preset temperature, power generation starts in step 2. In step 3, the load power detection means 6 performs the power load following operation according to the power load actually consumed in the home. If it is detected in step 4 that the power load consumed in the home is smaller than the generated power, the value obtained by subtracting the load power from the generated power in the calculation in step 5 is set as surplus power. In step 6, the surplus power is stored in the power storage means 11.

  According to such a configuration, even when the power load becomes smaller than the generated power, the surplus power is stored in the power storage means 11, so that a reverse power flow to the system power source can be prevented and power generation can be performed stably and continuously. It can be performed.

(Embodiment 2)
FIG. 4 is a configuration diagram of a control device for a fuel cell system according to Embodiment 2 of the present invention. 4, the same components as those in FIGS. 1 and 19 are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 4, the hot water storage tank 12 is the heat obtained from the exhaust heat recovery means 7 for recovering the exhaust heat from the product gas obtained by the hydrogen generator 1, the oxidant gas from the blower 2, and the fuel cell 4. The hot water obtained by using is stored. The heating means 13 is connected to the hot water storage tank 12 and changes electric power to heat to heat the water in the hot water storage tank 12 into hot water, for example, a heater. As described above, the operation is controlled so that the generated power amount always takes a small value with respect to the load power amount. However, the load power amount always fluctuates instantaneously, and the surplus power detection means 10 instantaneously loads the load power. When it is detected that electric power exceeding the amount is generated and output, the surplus power obtained by subtracting the load power amount from the generated power by the heating means 13 is converted into heat by the heating means 13 and consumed.

  Here, the control operation will be described with reference to the flowchart of FIG. In step 11, the fuel cell system is activated, and a hydrogen-rich gas is generated in the hydrogen generator 1. When the temperature of each part reaches a preset temperature, power generation is started in step 12. In step 13, the load power detecting means 6 performs the power load following operation according to the power load actually consumed in the home. If it is detected in step 14 that the power load consumed in the home is smaller than the generated power, a value obtained by subtracting the load power from the generated power by calculation in step 15 is set as surplus power. In step 16, the surplus power is supplied to the heating means 13, and the water in the hot water storage tank 12 is changed to hot water.

  According to such a configuration, even when the power load is smaller than the generated power, the surplus power is consumed by changing the power into heat by the heating means 13, so that a reverse power flow to the system power supply can be prevented and stable. Can generate electricity continuously.

(Embodiment 3)
FIG. 6 is a block diagram of a control device for a fuel cell system according to Embodiment 3 of the present invention. In FIG. 6, the same components as those in FIGS. 1, 4, and 19 are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 6, the heat surplus detection means 14 detects that the temperature of the hot water in the hot water storage tank 12 has reached the vicinity of the upper limit. The home appliance hot water supply means 15 supplies hot water to home appliances such as a dishwasher and a washing machine. When it is detected by the heat surplus detection means 14 that the temperature of the hot water in the hot water storage tank 12 has reached the upper limit, the home appliance hot water supply means 15 is used for home appliances that require hot water, such as dishwashers and washing machines. Hot water is supplied and the hot water in the hot water storage tank 12 is consumed.

  Here, the control operation will be described with reference to the flowchart of FIG. In step 21, the fuel cell system is started, and in step 22, the generated gas obtained in the hydrogen generator 1, the oxidant gas from the blower 2, and the exhaust heat are recovered from the fuel cell 4 during the power generation. To do. The water in the hot water storage tank 12 is heated to hot water by the exhaust heat recovered in step 23. If it is detected that the temperature of the hot water heated in step 24 has reached the upper limit, in step 25 hot water is supplied to home appliances that require hot water and the hot water in the hot water storage tank 12 is consumed.

  According to such a configuration, even when the hot water temperature in the hot water storage tank reaches near the upper limit due to exhaust heat recovery, the hot water temperature can be lowered by supplying hot water to the home appliance, thereby preventing the fuel cell system from stopping. And can prevent energy loss when restarting.

(Embodiment 4)
FIG. 8 is a block diagram of a control device for a fuel cell system according to Embodiment 4 of the present invention. 8, the same components as those in FIGS. 1, 4, 6, and 19 are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 8, domestic hot water supply means 16 supplies hot water to each room in the home, and releases heat as so-called hot water heating. When the surplus heat detecting means 14 detects that the temperature of the hot water in the hot water storage tank 12 has reached the upper limit, the hot water is supplied to each room in the home by the domestic hot water supply means 16 to release the heat. The hot water in 12 is consumed.

  Here, the control operation will be described with reference to the flowchart of FIG. In step 31, the fuel cell system is started, and in step 32, the generated gas obtained by the hydrogen generator 1 during startup and during power generation, the oxidant gas from the blower 2, and the exhaust heat from the fuel cell 4 are recovered. To do. Then, the water in the hot water storage tank 12 is heated to hot water by the exhaust heat recovered in step 33. If it is detected that the temperature of the hot water heated in step 34 has reached the upper limit, in step 35 hot water is supplied to each room in the home to release the heat, and the hot water temperature in the hot water storage tank 12 is increased. Lower.

  According to such a configuration, even when the hot water temperature in the hot water storage tank reaches near the upper limit due to exhaust heat recovery, the hot water temperature can be lowered by releasing heat and the fuel cell system is stopped. Can be prevented, and energy loss when restarting can be prevented.

(Embodiment 5)
FIG. 10 is a configuration diagram of a control device for a fuel cell system according to Embodiment 5 of the present invention. 10, the same components as those in FIGS. 1, 4, 6, 8, and 19 are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 10, the hot water power conversion means 17 generates power using the heat of hot water in the hot water storage tank 12. When it is detected by the heat surplus detection means 14 that the temperature of the hot water in the hot water storage tank 12 has reached the upper limit, the hot water power conversion means 17 converts the hot water into electric power so that it can be used as household electric power. To do.

  Here, the control operation will be described with reference to the flowchart of FIG. In step 41, the fuel cell system is started, and in step 42, the generated gas obtained in the hydrogen generator 1, the oxidant gas from the blower 2, and the exhaust heat from the fuel cell 4 are recovered during the start-up and power generation. To do. Then, the water in the hot water storage tank 12 is heated to hot water by the exhaust heat recovered in step 43. If it is detected in step 44 that the temperature of the heated hot water has reached the upper limit, in step 45 the hot water power conversion means 17 converts the hot water into electric power so that it can be used as household electric power. To.

  According to this configuration, even when the hot water temperature in the hot water storage tank reaches the upper limit due to exhaust heat recovery, the hot water temperature in the hot water storage tank can be lowered by converting the heat of the hot water into electric power, and the fuel cell system Can be prevented. Moreover, the energy loss at the time of restarting can be prevented. It can be used as electric power especially in the summer when there is little demand for hot water.

(Embodiment 6)
FIG. 12 is a block diagram of a control device for a fuel cell system according to Embodiment 6 of the present invention. 12, the same components as those in FIGS. 1, 4, 6, 8, 10, and 19 are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 12, the 2nd electrical storage means 18 stores the electric power converted by the warm water electric power conversion means 17, and is a secondary battery, a storage battery, etc. In FIG. When it is detected by the heat surplus detection means 14 that the temperature of the hot water in the hot water storage tank 12 has reached the upper limit, the hot water power conversion means 17 converts the hot water into electric power, and further the second power storage means 18 supplies power. Is to be stored.

  Here, the control operation will be described using the flowchart of FIG. In step 51, the fuel cell system is activated, and in step 52, the generated gas obtained by the hydrogen generator 1, the oxidant gas from the blower 2, and the exhaust heat from the fuel cell 4 are recovered during the activation and power generation. To do. Then, the water in the hot water storage tank 12 is heated to hot water by the exhaust heat recovered in step 53. If it is detected in step 54 that the temperature of the heated hot water has reached the upper limit, the hot water power conversion means 17 converts the hot water into electric power in step 55. In step 56, the electric power is stored in the second power storage unit 18.

  According to such a configuration, even when the hot water temperature in the hot water storage tank reaches near the upper limit due to exhaust heat recovery, the heat of hot water is converted into electric power, and the electric power is stored whenever necessary, especially in the summer. It can be used as electric power during the demand period.

(Embodiment 7)
FIG. 14 is a configuration diagram of a control device for a fuel cell system according to Embodiment 7 of the present invention. 14, the same components as those in FIGS. 1, 4, 6, 8, 10, 12, and 19 are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 14, the third power storage means 19 is a combination of the function of the power storage means 11 and the function of the second power storage means 18, and is a secondary battery or a storage battery. The power storage unit 11 that stores surplus power when power exceeding the load power is generated and output and the second power storage unit 18 that stores power converted from hot water by the hot water power conversion unit 17 are functionally provided. Combined or shared.

  According to such a configuration, it is possible to improve efficiency and promote cost reduction by sharing the power storage means.

(Embodiment 8)
FIG. 15 is a block diagram of a control device for a fuel cell system according to Embodiment 8 of the present invention. In FIG. 15, the same components as those in FIGS. 1, 4, 6, 8, 10, 12, 14, and 19 are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 15, the heat storage means 20 uses hot water in the hot water storage tank 12 to convert it into heat and store the heat. When it is detected by the heat surplus detection means 14 that the temperature of the hot water in the hot water storage tank 12 has reached the upper limit, the hot water in the hot water storage tank 12 is converted into heat and stored in the heat storage means 20 as heat. Heat is also used as the next startup energy.

  Here, the control operation will be described with reference to the flowchart of FIG. In step 61, the fuel cell system is started, and in step 62, the generated gas obtained by the hydrogen generator 1, the oxidant gas from the blower 2, and the exhaust heat from the fuel cell 4 are recovered during the start-up and power generation. To do. Then, the water in the hot water storage tank 12 is heated to hot water by the exhaust heat recovered in step 63. If it is detected in step 64 that the temperature of the heated hot water has reached the upper limit, heat is recovered from the hot water in the hot water storage tank 12 in step 65 and stored in the heat storage means 20. In step 66, it is used as thermal energy at the next startup of the fuel cell system.

According to such a configuration, even when the hot water temperature in the hot water storage tank reaches the upper limit due to exhaust heat recovery, heat is recovered from the hot water and stored in the heat storage means, so that the thermal energy at the next start-up of the fuel cell system Since it can be used effectively, the startup time can be greatly reduced.

(Embodiment 9)
FIG. 17 is a configuration diagram of a control device for a fuel cell system according to Embodiment 9 of the present invention. In FIG. 17, the same components as those in FIGS. 1, 4, 6, 8, 10, 12, 14, 15, and 19 are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 17, the outside air temperature detecting means 21 detects the temperature of the outside air and detects that the outside air temperature has dropped to a temperature at which there is a risk of freezing. When it is detected by the heat surplus detection means 14 that the temperature of the hot water in the hot water storage tank 12 has reached the upper limit, the hot water in the hot water storage tank 12 is converted into heat and stored in the heat storage means 20 as heat. If the outside air temperature detecting means 21 detects that the outside air temperature has dropped to a temperature at which there is a risk of freezing, the heat stored in the heat storage means 20 is released, and the fuel cell system has a risk of freezing. Preheat.

  Here, the control operation will be described with reference to the flowchart of FIG. In step 71, the fuel cell system is activated, and in step 72, the generated gas obtained by the hydrogen generator 1, the oxidant gas from the blower 2, and the exhaust heat from the fuel cell 4 are recovered during activation and during power generation. To do. Then, the water in the hot water storage tank 12 is heated to hot water by the exhaust heat recovered in step 73. If it is detected in step 74 that the temperature of the heated hot water has reached the upper limit, heat is recovered from the hot water in the hot water storage tank 12 in step 75 and stored in the heat storage means 20. In step 76, if the outside air temperature detecting means 21 detects that the temperature of the outside air has fallen below a certain temperature, the heat stored in the heat storage means 20 is released to the fuel cell system in step 77, and there is a risk of freezing. A path is preheated.

According to such a configuration, even when the hot water temperature in the hot water storage tank reaches the upper limit due to exhaust heat recovery, if the heat is recovered from the hot water and stored in the heat storage means, the temperature of the outside air drops below a certain temperature. However, if the path that may cause the system to freeze is heated in advance, it is possible to prevent trouble at the time of starting the fuel cell system due to freezing.

  The fuel cell system control device of the present invention prevents the reverse power flow to the system power source and stably generates power even when the power load actually consumed in the home is smaller than the generated power. Can do. Even when the hot water temperature in the hot water storage tank reaches the upper limit due to exhaust heat recovery, the fuel cell system does not stop and can be used effectively by active consumption of hot water, conversion to electric power and heat, and storage. Since power generation can be continued, it is useful for generating power using a fuel cell. It can also be applied to cogeneration systems using other batteries and power sources.

1 is a configuration diagram of a control device for a fuel cell system according to Embodiment 1 of the present invention. Time chart showing the daily operation of the device Flow chart showing control operation of the apparatus The block diagram of the control apparatus of the fuel cell system in Embodiment 2 of this invention Flow chart showing control operation of the apparatus The block diagram of the control apparatus of the fuel cell system in Embodiment 3 of this invention Flow chart showing control operation of the apparatus The block diagram of the control apparatus of the fuel cell system in Embodiment 4 of this invention Flow chart showing control operation of the apparatus The block diagram of the control apparatus of the fuel cell system in Embodiment 5 of this invention Flow chart showing control operation of the apparatus The block diagram of the control apparatus of the fuel cell system in Embodiment 6 of this invention Flow chart showing control operation of the apparatus The block diagram of the control apparatus of the fuel cell system in Embodiment 7 of this invention The block diagram of the control apparatus of the fuel cell system in Embodiment 8 of this invention Flow chart showing control operation of the apparatus The block diagram of the control apparatus of the fuel cell system in Embodiment 9 of this invention Flow chart showing control operation of the apparatus Configuration diagram of conventional fuel cell system control device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydrogen generator 4 Fuel cell 5 DC-AC converter 6 Load electric power detection means 9 Controller 10 Surplus power detection means 11 Power storage means 12 Hot water storage tank 13 Heating means 14 Heat surplus detection means 15 Home appliance hot water supply means 16 Domestic hot water supply means 17 Hot water power conversion means 18 Second power storage means 19 Third power storage means (power storage means)
20 Thermal storage means 21 Outside air temperature detection means

Claims (9)

A hydrogen generator, a fuel cell that generates electricity by reacting the product gas obtained by the hydrogen generator and an oxidant gas, and direct-current AC conversion that converts direct-current power generated by the fuel cell into alternating-current power A load power detection means for detecting the load power at the actually consumed power load, a controller for controlling a series of operations from the start of operation to power generation, and the load power amount actually consumed is the direct current Surplus power detection means for detecting when the power is smaller than the power output from the AC converter, and storage means, and the controller generates power exceeding the load power even instantaneously by the surplus power detection means. When it is detected that the output has been made, electric power is stored by the power storage means. A hydrogen generator, a fuel cell that generates electricity by reacting the product gas obtained by the hydrogen generator and an oxidant gas, and direct-current AC conversion that converts direct-current power generated by the fuel cell into alternating-current power A load power detection means for detecting the load power at the actually consumed power load, a controller for controlling a series of operations from the start of operation to power generation, and the load power amount actually consumed is the direct current Utilizing surplus power detection means for detecting when the power is smaller than the power output by the AC converter, the generated gas or oxidant gas obtained by the hydrogen generator, and the exhaust heat from the fuel cell A hot water storage tank for storing the obtained hot water, and a heating means connected to the hot water storage tank, the controller was detected by the surplus power detection means to generate and output electric power exceeding the load power even instantaneously. If the above Changing the power to heat by thermal means, the control device of the fuel cell system, which comprises heating the hot water of the hot water storage tank. From a hydrogen generator, a fuel cell that generates electricity by reacting a product gas obtained by the hydrogen generator and an oxidant gas, a product gas and an oxidant gas obtained by the hydrogen generator, and the fuel cell A hot water storage tank for storing the hot water obtained by using the exhaust heat of the water, a controller for controlling a series of operations from the start of operation to power generation, and that the temperature of the hot water in the hot water storage tank has reached the upper limit. A heat surplus detection means for detecting; and a home appliance hot water supply means for supplying hot water to home appliances such as a dishwasher and a washing machine, wherein the controller detects the temperature of hot water in the hot water storage tank by the heat surplus detection means. The fuel cell system control device is characterized in that hot water is supplied to the home appliance by the home appliance hot water supply means when it is detected that has reached the upper limit. From a hydrogen generator, a fuel cell that generates electricity by reacting a product gas obtained by the hydrogen generator and an oxidant gas, a product gas and an oxidant gas obtained by the hydrogen generator, and the fuel cell A hot water storage tank for storing the hot water obtained by using the exhaust heat of the water, a controller for controlling a series of operations from the start of operation to power generation, and that the temperature of the hot water in the hot water storage tank has reached the upper limit. The heat surplus detection means for detecting and the domestic hot water supply means for supplying hot water to each room in the home, the controller has reached the upper limit of the temperature of the hot water in the hot water storage tank by the heat surplus detection means When this is detected, hot water is supplied to each room in the home by the domestic hot water supply means. From a hydrogen generator, a fuel cell that generates electricity by reacting a product gas obtained by the hydrogen generator and an oxidant gas, a product gas and an oxidant gas obtained by the hydrogen generator, and the fuel cell A hot water storage tank for storing the hot water obtained by using the exhaust heat of the water, a controller for controlling a series of operations from the start of operation to power generation, and that the temperature of the hot water in the hot water storage tank has reached the upper limit. A heat surplus detection means for detecting and a hot water power conversion means for generating electric power using high-temperature hot water, the controller has reached the upper limit temperature of the hot water in the hot water storage tank by the heat surplus detection means When this is detected, the hot water power conversion means converts high temperature hot water into electric power so that it can be used as electric power. 6. The control device for a fuel cell system according to claim 5, further comprising a second power storage unit, wherein the electric power converted by the hot water power conversion unit is stored in the second power storage unit. 7. The storage device according to claim 1, wherein the storage means stores electric power when generating and outputting electric power exceeding the load electric energy and when high-temperature hot water is converted into electric power. Control device for fuel cell system. From a hydrogen generator, a fuel cell that generates electricity by reacting a product gas obtained by the hydrogen generator and an oxidant gas, a product gas and an oxidant gas obtained by the hydrogen generator, and the fuel cell A hot water storage tank for storing the hot water obtained by using the exhaust heat of the water, a controller for controlling a series of operations from the start of operation to power generation, and that the temperature of the hot water in the hot water storage tank has reached the upper limit. A fuel cell system comprising: a heat surplus detection means for detecting; and a heat storage means for storing high-temperature hot water as heat, wherein the controller uses heat from the heat storage means as heat energy at the next start-up. Control device. In addition, when the controller detects that the system path has been lowered to a temperature at which there is a risk of freezing, the controller releases the heat stored in the heat storage unit in advance. 9. The fuel cell system control device according to claim 8, wherein the control device is heated.

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