Performance improvement of dual-half-controlled-converter and its applications in utility rectifiers

This paper presents improved control techniques for the three-phase three-wire dual-half controller-converter (DHCC) using an interleaved pulse width-modulation (PWM) technique. Compared with the hysteresis controller presented in earlier literatures, the proposed PWM controllers require smaller filtering elements and/or a lower sampling frequency. While the same number of active switches are used compared to a conventional voltage-source-converter (VSC), the current rating for each device in DHCC is significantly lower. The proposed system is free of shoot through and it provides system redundancy. Both simulations and experimental results are presented.