Modified Deadbeat Predictive Current Control Method for Single-Phase AC–DC PFC Converter in EV Charging System

In a single-phase charging system of electric vehicles, the current control performance of the single phase ac–dc factor correction (PFC) converter with a deadbeat predictive current control (DPCC) method is affected by the distorted grid voltage, parameter dependence, and control delay. To tackle these problems, a modified DPCC method is proposed in this article. By introducing a phase adjustment parameter θc, which can be directly calculated according to the required power factor, into the grid voltage feedforward of the current loop, an improved input current control performance with lower harmonic components and higher power factor can be achieved when the converter operates at unity power factor. At the same time, compared with the traditional method, a reactive power compensation function is added in the modified DPCC and a dead-time compensation method is adopted in the modulation. Finally, a 7.8-kW single-phase PFC converter is built to verify the feasibility and effectiveness of the proposed control method. The performance of the proposed system can be evaluated by using matlab/Simulink.

Keywords: Grid voltage compensation, predictive current control (PCC), reactive power, single-phase ac–dc PFC converter, total harmonic distortion.