Abstract

This paper focuses on the digital control technique and its industrialization of high-power three-phase three-level rectifier system. Firstly, the mathematical model of three-phase three-level VIENNA rectifier is established. The multiloop control method is realized based on the DQ coordinates, and a simplified three-level space vector pulse width modulation method which could simplify the calculation is proposed for the VIENNA rectifier. A composite control method of PI control and improved synchronous-frame repetitive control strategy is proposed to improve the quality of input current waveform. In order to improve the dynamic response of DC-bus, a power forward control strategy is proposed for the whole system. The whole system keeps unit power factor and pure sine input current. The modulation and control method of three-phase three-level rectifier is implemented in one DSP(digital signal processor). Experimental results of the 200kVA rectifier system show that the proposed modulation and control method is correct and effective.

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