Robust controller using LMI framework for PEM fuel cell system

Abstract

In this work, an H infinity controller has been designed for regulation of output voltage of polymer electrolyte membrane (PEM) fuel cell system using Linear Matrix Inequality (LMI) framework. Load variations affect the output voltage of the system and degradation in the output voltage appears which results in the variable voltage. Variable voltage cannot be considered appropriate for almost all electrical devices. Therefore a steady voltage is necessary and in this communication, the output voltage of the system has been maintained by manipulating the reactant feed of oxidizer for small load variations. The available different linear models of the system were treated as vertices of the polytope. These linear models were identified under different loads. The LMI's have been generated from a convex region of desired pole placement. The simulation results show that the controller synthesized using the LMI framework is deemed more effective.