Shengqing Li
ABSTRACT
Aiming at the problem of large total harmonic distortion for output voltage and current of a three-phase high-frequency chain matrix converter, a decoupling vector modulation strategy suitable for a two-stage transformation is performed. Firstly, the α-β coordinate plane is divided into 12 sectors to obtain space vector modulation signals. Secondly, a converter composed of bidirectional controllable switchs is decomposed into two single-phase controllable switching converters by using the polarity selection signal. Finally, the space vector modulation signal and polarity selection are logically combined to obtain power tube drive signals, which provide a freewheeling path during commutation, reducing commutation dead time. Simulation results show that, compared with the total harmonic distortion for voltage and current of conventional modulation strategy, those of the proposed stategy are respectively reduced by 1.84% and 0.7%when the output frequency is 50Hz, and1.79% and 1.5%, When 30Hz.
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