A hybrid multivectorbased predictive commonmode voltage reduction method for voltage source inverters
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1.College of Electric and Information Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China; 2.State Grid Henan Electric Power Company Xuchang Power Supply Company, Xuchang 461000, China; 3.State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems (China Electric Power Research Institute), Beijing 100192, China)

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TM464TH701

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    Abstract:

    In recent years, to reduce the influence of commonmode voltage on voltage source inverters, model predictive commonmode voltage reduction methods are widely studied. However, the conventional methods use only one nonzero voltage vector per control period, in which may bring large current harmonics. Therefore, a hybrid multivectorbased model predictive commonmode voltage reduction method is proposed. First, the principle of the proposed method is presented. Then, the influences of dead time and current ripples on the commonmode voltage are analyzed in detail, and the proposed multivectorbased model predictive control method is further improved. In the improved method, only one nonzero voltage vector is applied at current sector 7. While in other current sectors, multi nonzero voltage vectors are applied. In this way, not only can the commonmode voltage be restricted within ±Vdc/6, but also the current total harmonic distortion is reduced. Simulation and experimental results verify the effectiveness of the proposed method.

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  • Received:
  • Revised:
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  • Online: August 20,2020
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