Effect of Load Modeling on Low Frequency Current Ripple in Fuel Cell Generation Systems

Abstract

-In this work, an accurate analysis of low frequency current ripple in residential fuel cell power generation systems is performed based on the proposed residential load model and its unique operation algorithm. Rather than using a constant dc voltage source, a proton exchange membrane fuel cell (PEMFC) model is implemented in this research so that a system-level analysis considering the fuel cell stack, power conditioning system (PCS), and the actual load is possible. Using the attained results, a comparative study regarding the discrepancies of low frequency current ripple between a simple resistor load and a realistic residential load is performed. The data indicate that the low frequency current ripple of the proposed residential load model is increased by more than a factor of two when compared to the low frequency current ripple of a simple resistor load under identical conditions. Theoretical analysis, simulation data, and experimental results are provided, along with a model of the load usage pattern of low frequency current ripples.

Comprehensive influences measurement and analysis of power converter low frequency current ripple on PEM fuel cell

“…According to the electrochemical impedance spectroscopy analysis methods and equivalent circuit model of PEMFC stack, it is assumed that the PEMFC must meet the requirement of a linear system, and it is guaranteed by the amplitude of disturbance signals injected into the PEMFC. Then, the fluctuation signal can be conducted in either the galvanic-static mode or the potential-static mode [23].…”

Input current ripple reduction and high efficiency for PEM fuel cell power conditioning system

“…1, according to the operating principle of half-bridge DC/AC inverter, the final output voltage becomes a frequency of 50 Hz or 60 Hz sinusoidal waveform after filtering. The filtered output voltage and current of this inverter are expressed as follows [10].…”