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DYNAMIC LOW-POWER CONTROL OF CELL VOLTAGE IN A FUEL CELL STACK DURING LOW-POWER OPERATING MODES
DYNAMIC LOW-POWER CONTROL OF CELL VOLTAGE IN A FUEL CELL STACK DURING LOW-POWER OPERATING MODES
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机译:低功率运行模式下燃料电池堆中电池电压的动态低功率控制
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摘要
A fuel cell system includes a fuel cell stack and a controller. The fuel cell stack includes a catalyst and a stack voltage. The controller increases efficiency of the fuel cell stack by minimizing or removing an accumulation of oxides on the catalyst during a low-power operating mode of the fuel cell system. The controller executes a method for dynamically controlling the stack voltage during a detected low-power operating mode. The method includes commanding low-voltage/high-power pulses to the fuel cell stack via the controller at a magnitude and frequency sufficient for minimizing or removing the oxides. The system may include a direct current-direct current (DC-DC) boost converter, with the controller programmed to command the power pulses from the DC-DC boost converter. Or, the controller may be configured to command the power pulses by controlling a feed rate of the oxygen and/or the hydrogen.
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