Fuzzy/State-Feedback Control of a Non-Inverting Buck-Boost Converter for Fuel Cell Electric Vehicles

This paper presents an intelligent state feedback controller of a non-inverting buck-boost converter for fuel cell power sources. The proposed control strategy uses fuzzy logic control and state feedback control in order to combine advantages of both controllers. Fuel cell DC/DC converters often have to be able to both step-up and step-down the input voltage and provide a high efficiency in the whole range of output power. Non-inverting buck-boost converters provide both step-up and step-down characteristics. In this paper a state- space average model of converter is obtained and the effect of using a state feedback controller in order to stabilize and regulate the output voltage has been proposed. The use of intelligent state feedback controller allows choosing the proper pole placement of system and using inductor current as a feedback provides a fast dynamic response. Simulation results showed the capability of proposed control strategy during different conditions in fuel cell electric vehicles.