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Common-mode Voltage Reduction for Inverters Connected in Parallel Using an MPC Method with Subdivided Voltage Vectors
Joon Young Park*, Jiook Sin**, Yeongsu Bak*, Hae-Gwang Jeong***, Sung-Min Park and Kyo-Beum Lee
Abstract This paper presents a model predictive control (MPC) method to reduce the commonmode voltage (CMV) for inverters connected in parallel, which increase the capacity of energy storage systems (ESSs). The proposed method is based on subdivided voltage vectors, and the resulting algorithm can be applied to control the inverters. Furthermore, we use more voltage vectors than the conventional MPC algorithm; consequently, the quality of grid currents is improved. Several methods were proposed in order to reduce the CMV appearing during operation and its adverse effects. However, those methods have shown to increase the total harmonic distortion of the grid currents. Our method, however, aims to both avoid this drawback and effectively reduce the CMV. By employing phase difference in the carrier signals to control each inverter, we successfully reduced the CMV for inverters connected in parallel, thus outperforming similar methods. In fact, the validity of the proposed method was verified by simulations and experimental results.
Keyword Parallel-connected inverters, Grid-connected inverters, Common-mode voltage, Model predictive control, Phase-shifted carrier
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