Sliding mode controller based quadratic boost converter for fuel cell system

Abstract

Electric vehicle provides better performance in comparison of an Internal Combustion engine based vehicle. Conventionally, application of FC is as primary source of energy in electric vehicle as it provides better efficient and pollution free source of energy, unfortunately FC has slow dynamics response. As FC continues supplies power to load so control technique for FC system is required. For boosting output voltage of FC a power converter should be designed to meet some requirements such as regulated DC bus voltage and asymptotic stability of system. Switching frequency of conventional boost converter is limited which results reduction in voltage profile of dc bus, so for eliminating problem of switching frequency components of two boost converters are combined using a single switch, new converter is termed as quadratic boost converter. This will improve switching frequency and output voltage of boost converter. This paper presents control technique for boosting output voltage of FC using a quadratic boost converter and for controlling DC bus voltage under load variation condition sliding mode controller is used.