Suppression Method of Common-Mode Voltage for Three-Level Active Neutral-Point-Clamped Inverter Based on Selective Harmonics Elimination PWM
Hu Cungang1, 2, 3, Hu Jun1, Chen Quan1, 2, Wang Qunjing2, 3, Zheng Changbao1, 3
1. School of Electrical Engineering and Automation Anhui University Hefei 230601 China; 2. National Engineering Laboratory of Energy-Saving Motor & Control Technology Anhui University Hefei 230601 China; 3. Research Center for Power Quality Engineering of the Ministry of Education Anhui University Hefei 230601 China
Abstract：In the inverter system with motor load, the output common-mode voltage (CMV) of inverter can cause damage to motor stator insulation, reduce bearing life, and bring electromagnetic interference problem. Three-phase three-level active neutral-point-clamped (3L-ANPC) inverter is taken as the research object. The output waveforms of three-phase selective harmonics elimination PWM (SHEPWM) can be regarded as the switching-state vectors, which have different effects on the CMV and the neutral-point potential (NP). The characteristic of self-balancing for the NP under SHEPWM is studied. An improved SHEPWM for 3L-ANPC inverter is proposed in this paper. The control strategy can effectively reduce the output CMV of inverter while eliminating the line-to-line voltage harmonics and maintaining the NP self-balancing. Simulation and experimental platforms of 3L-ANPC inverter are constructed. Experimental results validate the proposed control strategy.
胡存刚, 胡军, 陈权, 王群京, 郑常宝. 基于特定谐波消除PWM的三电平有源中点钳位逆变器共模电压抑制方法[J]. 电工技术学报, 2016, 31(16): 93-102.
Hu Cungang, Hu Jun, Chen Quan, Wang Qunjing, Zheng Changbao. Suppression Method of Common-Mode Voltage for Three-Level Active Neutral-Point-Clamped Inverter Based on Selective Harmonics Elimination PWM. Transactions of China Electrotechnical Society, 2016, 31(16): 93-102.
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2016, Vol. 31 
