Abstract
In medium voltage high power (>1 MW) application, the parallel-connected current source converters (CSCs) are normally applied to increase the power region. By interleaving the paralleled CSCs, multilevel (five level) output current can be generated, and thus improving the harmonic performance. However, the common-mode voltage (CMV), common-mode current (CMC), and circulating current in the parallel CSC-fed motor drive system pose serious challenges to the system's operation, which should be addressed carefully. Moreover, for transformerless drives, the common-mode resonance under varying motor speeds is a potential problem due to the series connection of common-mode inductor and filter capacitor in the common-mode loop. This paper thoroughly investigates the common-mode resonance in transformerless parallel CSC system. A multilevel space-vector-modulation based method for the parallel CSC system is proposed to suppress the CMV and common-mode resonance. As a result, the circulating current and CMC excited by the CMV can be reduced correspondingly. The effectiveness of the proposed method is verified on a transformerless parallel-connected CSC system by both simulation and experiment.
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