Low Frequency Ripple Mitigation of the Fuel Cell Inverter System using a Controlled Buck Current Source - Part I: Hysteretic Control

This paper analyzes the possibility of using a nonlinear controller to mitigate the current ripple of an inverter system powered by a Polymer Electrolyte Membrane Fuel Cell (PEMFC) stack. Hybrid and fuel cell technologies need to be merged in Hybrid Power Sources (HPS) to assure high performance regarding the PEMFC energy efficiency and PEMFC life cycle. The nonlinear controller is designed based on inverse gain that gives a constant answer for all levels of current ripple. Its advantages will be showed in comparison with hysteretic current control technique (that was shown in part I). Finally, a fuzzy logic controller is proposed to design the nonlinear control law.