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Pulse-width modulation of hydrogen delivery is proposed to improve PEM fuel cell performance by optimizing power consumption and fluid transient behavior.

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Abstract

Pulse-width modulation of hydrogen delivery is proposed to accomplish better performance of PEM fuel cells. By evaluating power consumption patterns and time delays associated with hydrogen and air consumption, optimal functional feedback controllers are developed. By matching the ON and OFF times for the hydrogen and oxygen supply valves, in conjunction with a system fuzzy controller (1), the power output is matched to specific load requirements. The fluid transient behavior is also monitored, to develop functional relationships between the power curve, and the fluid conditions, in order to optimize the system performance. These functions are then used to update and improve the performance of the controller.

Key findings

  • Optimal functional feedback controllers are developed to match power output to specific load requirements.
  • System fuzzy controller improves performance by matching ON and OFF times for hydrogen and oxygen supply valves.
  • Functional relationships between power curve and fluid conditions are established to optimize system performance.

Keywords

Pulse-width modulationController (irrigation)Control theory (sociology)Transient (computer programming)Power (physics)Hydrogen

Identifiers

DOI
10.1115/power2008-60161
Journal
ASME 2008 Power Conference
Year
2007