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Abstract

Proton Exchange Membrane Fuel cell (PEMFC) generates electricity by electrochemical reaction of hydrogen gas and oxygen gas. Identification analysis is required to monitor the effect of fuel pressure towards the performance of PEMFC. Spectrogram capable to tracing changes in the phase behavior of electrical operations as external parameters is varied. Spectrogram is one of the time-frequency distribution (TFD) analysis techniques as it indicate a 3-Dimensional (3-D) graphic of the energy voltage with depend on frequency and time. The use of this technique is provided in this paper within the scope of monitoring the signal changes in the various load change of a 2000 Watt (W) PEM fuel cell stack. The 99.99% purity of hydrogen inlet pressure is varied from 0.1 bar to 0.5 bar using pressure regulator. GW-Instek GDS-3254 oscilloscope captured the waveform signal with various load demand between 0Amp until 36Amp (A) current. Thus, Spectrogram generated the monitoring of signal voltage and its parameter estimation of voltage direct current (VDC), voltage root means square (VRMS), and voltage alternating current (VAC) of every load changes on various pressure conditions. The voltage performance increases with rise in hydrogen inlet pressures and the spectrogram energy signal increases accordingly. The result shows that voltage performance of PEMFC increased as increased in hydrogen pressure. Therefore, the spectrogram technique has been proven useful and practical in identification parameter of various hydrogen inlet pressure of a PEM fuel cell stack.