Power Factor Control Algorithm for Matrix Rectifier for Battery Charging Systems of Electric Vehicles

Abstract

This paper proposes a novel input power factor control method, to provide unity input power factor for three-phase matrix rectifiers. The proposed algorithm introduces, at the input terminal of the matrix rectifier, an imaginary input capacitor generated by modifying a reference vector of the space vector modulation method. The proposed method yields a unity power factor operation despite the presence of the LC filter of the three-phase matrix rectifier. In addition, the proposed algorithm can be easily incorporated with conventional space vector modulation algorithms for the three-phase matrix rectifiers. Thus, the proposed method can control input power factor without employing proportional integral controllers used in conventional power factor control methods for the matrix rectifiers, leading to simple control structure and straightforward tuning process for power factor control.