Generator system utilizing a fuel cell

• US 4,839,246 A
• Filed: 05/19/1988
• Issued: 06/13/1989
• Est. Priority Date: 05/20/1987
• Status: Expired due to Term

• Current Assignee: Fuji Electric Company Limited (Fuji Electric Systems Company Limited)
• Original Assignee: Fuji Electric Company Limited (Fuji Electric Systems Company Limited)
• Inventors: Takabayashi, Yasuhiro
• Primary Examiner(s): Skapars, Anthony
• Application Number:
  US07/195,960
• Time in Patent Office: 390 Days
• Field of Search: 429/12, 429/13, 429/17, 429/22, 429/23, 429/9
• US Class Current: 429/430
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H01M 16/006 of fuel cells with rechargeable batteries
• CPC Class Codes: H01M 8/04589 of fuel cell stacks
• CPC Class Codes: H01M 8/04597 of auxiliary devices, e.g. batteries, capacitors
• CPC Class Codes: H01M 8/04649 of fuel cell stacks
• CPC Class Codes: H01M 8/04753 of fuel cell reactants
• CPC Class Codes: H01M 8/04776 at auxiliary devices, e.g. reformer, compressor, burner
• CPC Class Codes: H01M 8/04888 of auxiliary devices, e.g. batteries, capacitors
• CPC Class Codes: H01M 8/0612 from carbon-containing material
• CPC Class Codes: H02J 7/34 Parallel operation in networks using both storage and other dc sources, e.g. providing buffering H02J7/14 takes precedence
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/50 Fuel cells
• CPC Class Codes: Y10S 429/90 Fuel cell including means for power conditioning, e.g. Conversion to ac

Abstract

In a generator system having a fuel cell and a battery to which the output current from the fuel cell can be supplied, in the case of a sudden variation in load, a battery supplies the power to the load until the fuel cell responds to the sudden variation in load. After the output power derived from the fuel cell itself becomes sufficient to be supplied to the load, an excess of the power supplied to the load is charged into the battery.

Claims

1. A method for controlling a generator system having a fuel cell and a battery to which the output current from said fuel cell is supplied, said method comprising the steps of:

performing a first adjustment of adjusting the supply of the power to a load by said battery in response to the sudden variation in load until said fuel cell responds to said sudden variation in load; and

controlling the power supplied from said fuel cell while performing a second adjustment of adjusting the supply of the power to said load by said fuel cell after said fuel cell responds to the sudden variation in load.

2. A method as claimed in claim 1, wherein said step of performing said first adjustment includes a step of converting the DC power delivered from said battery into the AC power which is supplied to said load.

3. A method as claimed in claim 1, wherein the response of said fuel cell in the case of the sudden variation in load is delayed in time by an integrator.

4. A method as claimed in claim 1, wherein said step of performing said second adjustment includes a step of detecting the power to be supplied to said load.

5. A method as claimed in claim 4, wherein the power to be supplied to said load is detected by an AC transducer.

6. A method as claimed in claim 1, wherein said step of performing said second adjustment includes a step of setting the power to be charged into said battery.

7. A method as claimed in claim 1, wherein said step of performing said second adjustment includes a step of converting the DC power delivered from said battery into the AC power which in turn is supplied to said load.

8. A method as claimed in claim 1, wherein the control of the adjustment of the supply of the power to said load from said fuel cell is accomplished by a controller for auxiliary devices.

9. A method as claimed in claim 8, wherein said controller for auxiliary devices comprises an arithmetic unit, a pluse width modulator and power elements.

10. A method as claimed in claim 9, wherein said arithmetic unit comprises a function generator in the form of a CPU, an operational amplifier and one or more resistors.

11. A generator system having a fuel cell and a battery to which the output current from said fuel cell can be supplied, comprising:

a first adjustment means for adjusting the output current derived from said fuel cell;

a second adjustment means for adjusting the output current generated in said fuel cell;

a converter means for converting the DC power supplied from said first adjustment means and said battery into the AC power to be supplied to a load;

a first detector means for detecting the power supplied to said load from said converter means;

a second detector means for detecting the power supplied to said second adjustment means from the output side of said first adjustment means;

a setting means for setting a power to be charged to said battery;

an arithmetic means for calculating the detection signal representative of the power to be supplied to said load from said first detector means into the value prior to be supplied to said converter means;

an adder means for adding the output signal derived from said arithmetic means, the setting signal derived from said setting means and the detection signal derived from said second detector means;

a first controll means for controlling said first adjustment means in response to the output derived from said adder by delaying a time interval corresponding to the delay in response of said fuel cell; and

a second controll means for controlling said second adjustment means in response to the output from said adder means.

12. A generator system as claimed in claim 11, wherein said second adjustment means includes an air blower for supplying reaction air to said fuel cell.

13. A generator system as claimed in claim 11, wherein said converter means has an inverter.

14. A generator system as claimed in claim 11, wherein each of said first and second detector means has an AC transducer.

15. A generator system as claimd in claim 11, wherein said arithmetic means has a function generator in the form of a CPU and a divider.

16. A generator system as claimed in claim 11, wherein said first control means has a fuel-cell-current detector, an integrator and an adder.

17. A generator system as claimed in claim 16, wherein said fuel-cell-current detector has a Hall current transformer.

18. A generator system as claimed in claim 11, wherein said second control means comprises an arithmetic unit, a pluse-width modulator and power elements.

19. A generator system as claimed in claim 18, wherein said arithmetic unit has a function generator in the form of a CPU, an operational amplifier and one or more resistors.