A novel robust method for three - phase high power rectifier system with high quality

Abstract

This paper proposes a novel robust method for three-phase rectifier system with high quality for higher power applications. The system consists of two stages: The front stage combines the unique features of a low-kilovoltampere 12-pulse rectifier scheme along with a single-phase pwm rectifier scheme to shape the input current to a sinusoidal waveshape. The single-phase pwm rectifier stage is rated at 0.02 pu and assists in shaping the input current under varying load conditions, which concentrate extract specific harmonic energy and feeds it back to the 12-pulse rectifier system output side to reuse harmonic energy. Which is suitable for the clean-power utility interface of power electronic system. The post-stage is buffered soft-switching dc converter, the output voltage is adjustable continuously in a wide range. The proposed system is rugged and, in the event the active control were to fail, the system reverts to 12-pulse operation with fifth and seventh harmonic cancellation. Analysis and design of the system is examined in detail, and simulation and experimental results on a 60-kW prototype are shown. Results of the proposed system verify the validity and feasibility of the proposed method.