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Three-phase high power factor AC/DC converter

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2 Author(s)
Lin, B.-R. ; Dept. of Electr. Eng., Nat. Yunlin Univ. of Sci. & Technol., Taiwan, Taiwan ; Yang, T.-Y.

A unidirectional three-phase AC/DC converter is proposed to obtain almost unity power factor, draw sinusoidal line currents and keep the DC-bus voltage constant. Two active switches and two power diodes are used in each converter leg to generate a three-level PWM waveform on the AC terminal voltages. The proposed converter has simpler circuit configuration compared with the conventional three-level PWM converters. The classical proportional-integral voltage controller and the hysteresis current controller are adopted in the control scheme to achieve DC-bus voltage regulation and line-current command tracking. A neutral-point voltage compensator is used to balance the neutral-point voltage due to load change. The validity and effectiveness of the proposed control algorithm is verified through simulations and experimental results.

Published in:

Electric Power Applications, IEE Proceedings -  (Volume:152 ,  Issue: 3 )