Electric power plant with adjustable array of fuel cell systems
First Claim
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1. An electric power plant comprising:
- a power supply system, the power supply system comprising;
a power bus,a first and second fuel cell system, each fuel cell system comprising a fuel cell stack, an electrical power storage device electrically coupled in parallel with the fuel cell stack, and means for controlling a flow of current from the fuel cell stack to the electrical power storage device and the power bus,a first switch selectively operable to electrically couple the first fuel cell system in series in the power bus, anda second switch selectively operable to electrically couple the second fuel cell system in series in the power bus;
an oxidant supply system for supplying an oxidant gas to at least one of the fuel cell stacks; and
a fuel supply system for supplying a fuel gas to at least one of the fuel cell stacks,wherein the first switch is selectively operable according to an operating condition of the first fuel cell system, and wherein the power supply system further comprises a first redundancy switch electrically coupled in series with the first switch and selectively operable therewith to electrically couple the first fuel cell system in series to the power bus, the first redundancy switch being selectively operable according to at least one of the operating condition of at least the second fuel cell system, a voltage across the power bus, a desired output of the power supply system and a desired nominal current output of the power supply system.
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Abstract
An electric power plant includes an array of fuel cell systems. The fuel cell systems are electrically couplable in series and/or parallel combinations to provide a variety of output powers, output current and/or output voltages. The fuel cell systems are “hot swappable” and redundant fuel cell systems may automatically replace faulty fuel cell systems to maintain output power, current and/or voltage.
114 Citations
23 Claims
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1. An electric power plant comprising:
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a power supply system, the power supply system comprising; a power bus, a first and second fuel cell system, each fuel cell system comprising a fuel cell stack, an electrical power storage device electrically coupled in parallel with the fuel cell stack, and means for controlling a flow of current from the fuel cell stack to the electrical power storage device and the power bus, a first switch selectively operable to electrically couple the first fuel cell system in series in the power bus, and a second switch selectively operable to electrically couple the second fuel cell system in series in the power bus; an oxidant supply system for supplying an oxidant gas to at least one of the fuel cell stacks; and a fuel supply system for supplying a fuel gas to at least one of the fuel cell stacks, wherein the first switch is selectively operable according to an operating condition of the first fuel cell system, and wherein the power supply system further comprises a first redundancy switch electrically coupled in series with the first switch and selectively operable therewith to electrically couple the first fuel cell system in series to the power bus, the first redundancy switch being selectively operable according to at least one of the operating condition of at least the second fuel cell system, a voltage across the power bus, a desired output of the power supply system and a desired nominal current output of the power supply system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for operating an electric power plant having at least a first fuel cell system comprising a first fuel cell stack, an electrical power storage device electrically coupled in parallel with the first fuel cell stack, and a first switch to couple the first fuel cell system to a power bus;
- a second fuel cell system comprising a second fuel cell stack, another electrical power storage device electrically coupled in parallel with the second fuel cell stack, and a second switch to couple the second fuel cell system to the power bus;
wherein the first fuel cell system further comprises a redundancy switch in series with the first switch and the power bus, the method comprising;closing the first switch and the redundancy switch of the first fuel cell system to electrically couple the first fuel cell system to the power bus, wherein the redundancy switch is selectively operable according to at least one of an operating condition of at least the second fuel cell system, a voltage across the power bus, a desired output of a power supply system and a desired nominal current output of the power supply system. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
- a second fuel cell system comprising a second fuel cell stack, another electrical power storage device electrically coupled in parallel with the second fuel cell stack, and a second switch to couple the second fuel cell system to the power bus;
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21. A system for operating an electric power plant having at least a first fuel cell system comprising a first fuel cell stack, an electrical power storage device electrically coupled in parallel with the first fuel cell stack, and a first switch to couple the first fuel cell system to a power bus;
- a second fuel cell system comprising a second fuel cell stack, another electrical power storage device electrically coupled in parallel with the second fuel cell stack, and a second switch to couple the second fuel cell system to the power bus;
wherein the first fuel cell system further comprises a redundancy switch in series with the first switch and the power bus, comprising;means for closing the first switch and the redundancy switch of the first fuel cell system to electrically couple the first fuel cell system to the power bus, wherein the redundancy switch is selectively operable according to at least one of an operating condition of at least the second fuel cell system, a voltage across the power bus, a desired output of a power supply system and a desired nominal current output of the power supply system. - View Dependent Claims (22, 23)
- a second fuel cell system comprising a second fuel cell stack, another electrical power storage device electrically coupled in parallel with the second fuel cell stack, and a second switch to couple the second fuel cell system to the power bus;
Specification