Volume 40 Issue 9
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WANG Kezhi, ZHAO Wenhan, WANG Tao, YANG Gang, CHENG Guodong, GENG Yiwen. A strategy of neutral-point potential balance control and common-mode voltage suppressio[J]. Journal of Mine Automation, 2014, 40(9): 90-93. DOI: 10.13272/j.issn.1671-251x.2014.09.021
Citation: WANG Kezhi, ZHAO Wenhan, WANG Tao, YANG Gang, CHENG Guodong, GENG Yiwen. A strategy of neutral-point potential balance control and common-mode voltage suppressio[J]. Journal of Mine Automation, 2014, 40(9): 90-93. DOI: 10.13272/j.issn.1671-251x.2014.09.021
shu

A strategy of neutral-point potential balance control and common-mode voltage suppressio

  • 1.

    Shanxi Lu''an Environmental Energy Development Co., Ltd., Changzhi 046204, China

  • 2.

    School of Information and Electrical Engineering, China University of Mining and Technology, Xuzhou 221008, China

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  • For problems that there are common-mode voltage, over voltage and neutral-point potential imbalance simultaneously in power supply of inverter to motor through long cable, generation mechanisms of common-mode voltage and over voltage were analyzed as well as effect of neutral-point potential imbalance on common-mode voltage. A strategy of neutral-point potential balance control and common-mode voltage suppression was proposed, namely adding the fourth leg to traditional three-level inverter, controlling current of the fourth leg to realize neutral point potential balance and optimizing SVPWM modulation strategy of main circuit to restrain common-mode voltage. Effectiveness of the strategy is verified by Matlab simulation.
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