Bidirectional interleaved DC/DC converter for electric vehicle application

This paper proposes a scheme for changing the operation modes of bidirectional interleaved DC/DC converter used in battery powered electric vehicles (EVs). The proposed pattern changes the converter operation from boost to buck according to the DC-link voltage value. This strategy is suggested to save power and increase efficiency of the EV energy storage system (ESS). A buck-boost DC/DC converter is adopted to boost the DC-link voltage in driving mode, and to charge the battery in braking mode. In boost mode, PI control of DC-link voltage is implemented to maintain constant DC-link voltage in driving operation. In buck mode, PI control of battery voltage is applied to reduce ripples of battery voltage. In both modes of operation, current control schemes are applied to keep equally sharing of battery current between converter modules. To validate the performance of the proposed scheme, a simulation is performed and verified with EV propulsion system.