Sliding mode control of a cascade boost converter for fuel cell energy generation system

Abstract

This paper deals with the problem of controlling a DC-DC cascade boost converter associated to the fuel cell (FC) for electric vehicle (EV) applications. The control objective is mainly to regulate the dc output voltage to its desired constant value and to ensure asymptotic stability of the closed loop system. Based on the nonlinear model of the whole system (taking into account the nonlinear V-I characteristic of the FC and the nonlinear model of the cascade boost converter), a sliding mode controller is elaborated. It is shown using theoretical formalism and simulations that the proposed nonlinear controller achieves all the objectives.