A Three-Vector Modulation Strategy for Indirect Matrix Converter Fed Open-End Load to Reduce Common-Mode Voltage With Improved Output Performance

This paper proposes a three-vector modulation (TVM) strategy for a five-leg indirect matrix converter (IMC) fed three-phase open-end load (OEL) drive to reduce common-mode voltage (CMV) with improved output performance. By utilizing three nearest active voltage vectors to generate desired output voltage, the proposed TVM strategy can eliminate the CMV across the load phase and reduce the peak value of CMV at the load terminal to 42%. Compared to other modulation strategies for the IMC fed OEL drives, the problems associated with simultaneous switching of two legs and zero-sequence current do not occur with the TVM strategy. Also, a constant average dc-link voltage is achieved by using three active current vectors to synthesize reference input current, so that the output performance of the five-leg IMC is improved regarding output current and output voltage harmonic distortions. Simulation and experimental results are provided to verify the performance of the TVM strategy.