A DC Ripple Voltage Suppression Scheme by Harmonic Injection in Three Phase Buck Diode Rectifiers with Unity Power Factor

단위 역률을 갖는 3상 강압형 다이오드 정류기에서 고조파 주입에 의한 DC 리플전압 저감 기법

A technique to suppress the low frequency ripple voltage of the DC output in three phase buck diode rectifiers is presented in this paper. The proposed pulse frequency modulation methods and duty ratio modulation methods are employed to regulate the output voltage of the buck diode rectifiers and guarantee zero-current -switching(ZCS) of the switch over the wide load range The proposed control methods used in this paper provide generally good performance such as low THD of the input line current and unity power factor. IN addition control methods can be effectively used to suppress the low frequency ripple voltage appeared in the dc output voltage. The harmonic injection technique illustrates its validity and effectiveness through the simulations.