JPH08162136A - Fuel cell generating device - Google Patents

Abstract

PURPOSE: To perform a starting operation even when no power is supplied from an external power supply equipment, and stably control the operation. CONSTITUTION: This device is provided with a storage battery 16, a DC-AC converting device 17 for converting the DC output, and a battery charger 15 for charging the storage battery 16. A switch 11 and a switch 13 are laid in the opened state, a switch 14 is laid in the closed state to supply the AC output of the DC-AC converting device 17 to a control equipment system 10 such as a control equipment 5, motor-operated valves 6, and pumps 7, and the DC output of the storage battery 16 is further supplied to a part of the control equipment 5 to start a fuel cell body 1. The switch 11 and the switch 13 are switched to the closed state according to the starting end, the switch 14 is switched to the opened state, and the output of a DC-AC converting device 2 is partially supplied to the control equipment system 10 to control the operation. The output is also partially supplied to the battery charger 15, and the storage battery 16 is charged to fill up the consumed power.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cell power generator which introduces a reaction gas to obtain electric power by an electrochemical reaction, and more particularly to a fuel cell power generator equipped with a control power supply device for starting and stopping the fuel gas.

[0002]

2. Description of the Related Art FIG. 2 is a single line connection diagram of a main part of a conventional fuel cell power generator. To a line for supplying alternating current power obtained by converting the direct current power generated in the fuel cell main body 1 by the orthogonal converter 2 to the load system 3, to equipment related to the operation control of the fuel cell main body 1, for example, the fuel cell main body 1. A control device 5 used for controlling a gas supply / exhaust device for supplying a reaction gas, a cooling water supply / exhaust device for supplying cooling water, etc., or a motor-operated valve 6, a pump 7, a start-up boiler 8, a cooling tower, etc. A line for supplying electric power to the control device system 10 including the external auxiliary device 9 and the like is connected via the switch 11. A control power supply system 4 is connected to the control device system 10 via a switch 12. The control power supply system 4 is usually a commercial power system,
Or private power generation equipment is used.

In this fuel cell power generator, when the fuel cell main body 1 is started, the switch 11 is held in the open state, the switch 12 is closed, and power is supplied from the control power supply system 4 to the control device system 10. The method of supply is adopted. When the start-up is completed and the fuel cell body 1 enters the steady operation, the DC power generated in the fuel cell body 1 is converted into AC power by the orthogonal converter 2 and is constantly supplied to the load system 3. It will be. At this time, by closing the switch 11 and supplying a part of the output to the control device system 10, the operation of the fuel cell main body 1 is controlled by the electric power generated by itself.

Further, in the stop operation for ending and stopping the power generation of the fuel cell main body 1, it becomes impossible to rely on the electric power generated by itself, so that the switch 12 is closed for control as in the start operation. A method of connecting to the power supply system 4 and supplying electric power to the control device system 10 is adopted.

[0005]

In the conventional fuel cell power generator, as described above, the control power supply system 4 is used at the start operation and the stop operation when the fuel cell body 1 is not generating power, and at the time of power generation. Since the method of controlling the operation of the control equipment system 10 by the generated electric power is used,
Under normal operating conditions, stable operation control is performed during the entire period from start to stop.

However, for example, in a remote island or a low-developed area, there are many cases where there is no commercial power system, it is extremely unstable, and there is no private power generation facility. Therefore, when the fuel cell power generator is installed in such an area, the fuel cell power generator using the conventional operation control method has a problem that the starting operation cannot be performed.

An object of the present invention is to solve the above problems and to reliably perform start-up operation and stop operation even if power is not supplied from an external power supply facility such as a commercial power system or a private power generation facility. And a stable operation control of the fuel cell power generator.

[0008]

In order to achieve the above object, in the present invention, a fuel cell body in which an electrolyte body is sandwiched between a fuel electrode and an air electrode and a cooling plate is incorporated,
A gas supply and discharge device that supplies and discharges fuel gas and air to the fuel electrode and the air electrode, a cooling water supply and discharge device that supplies and discharges cooling water to the cooling plate, and a direct current generated by an electrochemical reaction in the fuel cell body. An electric power conversion device for converting electric power into direct current or alternating current power and supplying it to the load system, and electric power obtained from the first orthogonal conversion device for the gas supply / exhaust device, the cooling water supply / exhaust device, and the control device system of the auxiliary machine. In a fuel cell power generator that supplies and controls a part of the power through a first switch, a storage battery, an orthogonal converter that converts the DC output power of the storage battery to AC, and an AC output power of the orthogonal converter The power supply device for start-up, which is connected to a second switch for supplying or shutting off the power supply, is provided.

Further, the storage battery of the above-mentioned power source for start-up is connected to the charger connected to the output of the power converter via the third switch. Furthermore, the direct-current output power of the storage battery of the starting power supply device is connected to the control equipment system.

[0010]

As described above, in the fuel cell power generator, the storage battery, the orthogonal converter for converting its DC output power to AC, and the second switch for supplying or shutting off the AC output power to the control equipment system. If a starting power supply device is connected, the second switch is closed so that the AC power obtained by converting the DC output power of the storage battery by the orthogonal converter is supplied to the control equipment system. Since the power can be supplied, it is possible to control the operation of the control device system without separately supplying power from an external power source, and it is possible to smoothly perform the starting operation and further the stopping operation of the fuel cell power generator.

Further, if the storage battery of the starting power supply device is connected to the charger connected to the output of the power conversion device through the third switch, the fuel cell power generation device completes the starting operation. Then, enter the steady operation state, convert the generated power with the power converter, supply a part of it to the control equipment system, and when the operation is controlled by the power generated by itself, close the third switch. By setting the state, the storage battery can be recharged by the charger. Therefore, even if the fuel cell power generator is not equipped with a large-capacity storage battery, the starting operation and the stopping operation of the fuel cell power generator can be stably performed for a long time.

Furthermore, if the DC output power of the storage battery of the above-mentioned power source for starting is supplied to the control equipment system, even if the control equipment is operated and controlled by the DC power, the AC / DC conversion is separately performed. The operation can be controlled without using the device.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a single-line connection diagram of a main part of an embodiment of a fuel cell power generator according to the present invention. Constituent devices having the same functions as those of the conventional example shown in FIG. 2 are designated by the same reference numerals and description thereof will be omitted. The difference between the present embodiment and the conventional example is the configuration of the control power supply of the control device system 10 such as the control device 5 related to the operation control of the fuel cell main body 1, the motor-operated valves 6 and the pumps 7. Instead of the external control power supply system 4 used in the conventional example, in the present embodiment, the storage battery 16 and the orthogonal conversion device 17 are replaced by the switch 14.
Is connected to the control device system 10 via the switch, and the storage battery 16 is connected to the charger 15 connected to the output end of the orthogonal converter 2 via the switch 11 and the switch 13. Further, it is connected so as to supply the DC output power of the storage battery 16 to the control device 5, and is connected to a device whose operation is controlled by the DC power.

In the fuel cell power generator of this embodiment,
At the time of start-up operation for starting the fuel cell main body 1 to be in a steady operation state, the switch 11 and the switch 13 are opened,
The control device 5, the motor-operated valves 6 and the pumps 7 are supplied by supplying the AC power obtained by converting the DC output power of the storage battery 16 by the orthogonal converter 17 to the control device system 10 with the switch 14 closed. Etc. are controlled.

When the start of the fuel cell main body 1 is completed and the output of the orthogonal transformation device 2 reaches a level connectable to the load of the load system 3, the switches 11 and 13 are closed and the switch 14 is opened. To supply a part of the output power of the orthogonal transformation device 2 to the control device system 10,
The fuel cell power generator obtains a steady state in which the operation is controlled by the power generated by itself. At this time, since the switch 13 is also switched to the closed state, a part of the output power of the orthogonal transformation device 2 is sent to the charger 15 via the switch 11 and the switch 13 to charge the storage battery 16 and start the operation. The power consumed in step 1 is complemented and the voltage is maintained at a predetermined voltage.

At the time of a stop operation for ending and stopping the power generation of the fuel cell power generator, the switch 1
1 and the switch 13 are switched to the open state and the switch 14 is switched to the closed state, and the AC output power obtained by converting the DC output power of the storage battery 16 by the orthogonal converter 17 is supplied to the control equipment system 10 to control the operation. Take the method to do. Although the switch 13 connected to the charger 15 is incorporated in series with the switch 11 in the present embodiment, the same effect can be obtained by directly connecting the switch 13 to the output terminal of the orthogonal transformation device 2. It is obvious that

In the present embodiment, the DC power generated by the fuel cell body 1 is converted into AC power by the orthogonal converter 2 and supplied to the load system 3. Corresponding to the required conditions of, even when using a power converter for converting to DC power, if a part of the output is converted to AC power and used, the same effect as the above embodiment can be obtained. Become.

[0018]

According to the present invention, as described above, a fuel cell main body in which an electrolyte body is sandwiched between a fuel electrode and an air electrode and a cooling plate is incorporated, and fuel gas and air are supplied to the fuel electrode and the air electrode, respectively. The gas supply and discharge device that supplies and discharges the cooling water, the cooling water supply and discharge device that supplies and discharges the cooling water to the cooling plate, and the load system that converts the DC power generated by the electrochemical reaction in the fuel cell body into DC or AC power. And a part of electric power obtained from the power conversion device is supplied to the gas supply and discharge device, the cooling water supply and discharge device, and the control equipment system of the auxiliary device through the first switch. In a fuel cell power generator for control, a storage battery, an orthogonal converter for converting its DC output power to AC, and a second switch for supplying or shutting off AC output power of the orthogonal converter to a control equipment system. Since the starting power supply device is connected, the second switch is closed so that the AC output power obtained by converting the DC output power of the storage battery by the orthogonal conversion device is controlled by the control device system. Since it can be supplied to and controlled for operation, start-up operation and even stop operation can be performed smoothly and stably even without supply of power from an external power source such as a commercial power system or private power generation equipment. It is now possible to obtain a fuel cell power generator that can be operated and controlled.

Further, if the storage battery of the starting power supply device is connected to the charger connected to the output of the power conversion device through the third switch, the fuel cell power generation device completes the starting operation. Then, in the steady operation state, the third
The storage battery can be recharged by the charger by closing the switch. Therefore, it is possible to obtain a fuel cell power generation device capable of stably performing a starting operation and a stopping operation for a long period of time without providing a large-capacity storage battery.

Furthermore, if the DC output power of the storage battery of the starting power supply device is connected so as to be supplied to the control device system, even if the control device is operated and controlled by the DC power, the AC / DC conversion is separately performed. It is possible to obtain a fuel cell power generation device that can be operated and controlled without using the device.

[Brief description of drawings]

FIG. 1 is a single-line connection diagram of a main part of an embodiment of a fuel cell power generator according to the present invention.

FIG. 2 is a single line connection diagram of a main part of a conventional fuel cell power generator.

[Explanation of symbols]

 1 Fuel Cell Main Body 2 Orthogonal Converter 3 Load System 5 Control Equipment 6 Motorized Valves 7 Pumps 8 Startup Boiler 9 External Auxiliary Machine 10 Control Equipment System 11 Switch 13 Switch 14 Switch 15 Charger 16 Storage Battery 17 Orthogonal Converter

Claims (3)

[Claims] 1. A fuel cell body in which an electrolyte body is sandwiched between a fuel electrode and an air electrode and a cooling plate is incorporated, and a gas supply and discharge device for supplying and discharging fuel gas and air to the fuel electrode and the air electrode, respectively. And a cooling water supply and discharge device that supplies and discharges cooling water to the cooling plate, and a power conversion device that converts direct-current power generated by an electrochemical reaction in the fuel cell body into direct-current or alternating-current power and supplies the load system. And a part of the electric power obtained from the first orthogonal conversion device is supplied to the control device system of the gas supply / exhaust device, the cooling water supply / exhaust device, and the auxiliary device through the first switch to control the operation. In a fuel cell power generator, a storage battery, an orthogonal converter for converting its DC output power to AC, and a second switch for supplying or shutting off the AC output power of the orthogonal converter to the control system. Fuel cell power generation apparatus characterized by comprising an activation power source apparatus formed by connecting. 2. The fuel cell power generator according to claim 1, wherein the storage battery of the starting power supply device is connected to a charger connected to an output of the power conversion device via a third switch. A fuel cell power generator characterized by the above. 3. The fuel cell power generator according to claim 1, wherein the DC power output from the storage battery of the starting power supply device is connected so as to be supplied to the control equipment system. Battery generator.