Analysis and implementation of a bidirectional dc-dc converter with coupled inductor for an electric vehicle powertrain

Identifier:  TDX:2954

Handle: https://hdl.handle.net/20.500.11797/TDX2954

Authors:  González Castaño, Catalina

Abstract:
In this thesis a bidirectional noninverting buck-boost converter located between a battery pack and the inverter to regulate the dc bus in electric vehicle (EV) powertrain is proposed. The converter is based on the versatile buck-boost converter, which in low voltage and hard-switching applications has shown a great performance in different topologies of fuel cell systems. Therefore, extending the use of the converter to higher voltage applications such as the EV is a challenge that is addressed in this work. The use of a high-efficiency step-up/step-down converter, as in the case of the versatile converter, in an EV powertrain can improve the whole system efficiency for an extent range of electric motor speeds which comprises urban and highway driving cycles while allowing the operation under motoring and regeneration (regenerative brake) conditions. The proposed converter control corresponds to an outer voltage feedback loop and an inner current programmed controller using the digital signal controller (DSC) TMS320F28377S. The theoretical analyses have been validated by means of simulations and experimental tests performed on a 400-V 1.6-kW purpose built-prototype.