MAXIMUM POWER POINT TRACKING OF PROTON EXCHANGE MEMBRANE FUEL CELL WITH FRACTIONAL ORDER FILTER AND EXTREMUM SEEKING CONTROL

摘要

Proton Exchange Membrane FC (PEMFC) is widely recognized as a potentially renewable and green energy source based on hydrogen. Maximum power point tracking (MPPT) is one of the most important working conditions to be considered. In order to improve the searching performance such as convergence and robustness under disturbance and uncertainty, a kind of fractional order low pass filter(FOLPF) is applied for the MPPT controller design based on general Extremum Seeking Control(ESC). The controller is designed with FOLPF and high pass filter(HPF) substituting the normal LPF and HPF in the original ESC design. With this FOLPF ESC, better convergence and smooth performance is gained while maintaining the robust specifications. Simulation results are included to validate the proposed new FOLPF ESC scheme under disturbance and comparisons between FOLPF ESC and general ESC method are also provided.