A Grid-Friendly Bidirectional Electric Vehicle Charger Based on CLC Resonant Converter

With the increasing frequency of interaction between electric vehicles and the power grid, the key to the development of electric vehicles lies in improving the friendly interaction between electric vehicles and the power grid, and the bidirectional charging and discharging efficiency of electric vehicles. In this paper, a CLC bidirectional isolated resonant converter based on virtual synchronous machine control technology is proposed. On the one hand, the charging and discharging stability of the electric vehicle is enhanced by the converter, which facilitates the friendly interaction of the high-power interface converter with the power grid. On the other hand, the efficiency of the converter is improved by the zero-voltage turn-on and zero-current turn-off characteristics of the rectifier. Simultaneously, a single high/low level switch can be used to control the power flow of the interface converter, which simplifies the mode conversion operation of EVs and enhances the operability of the charge-discharge mode conversion. The effectiveness and accuracy of the proposed control strategy are verified by simulation.