摘要
针对五电平有源中点钳位型逆变器的母线中点电压平衡、开关频率优化以及共模电压抑制等多目标优化问题展开研究,本文提出了一种基于零序电压注入的方法控制母线中点电压平衡,通过计算所有关键零序电压对应的中点电流,并从中选择最优的关键零序电压来产生所需的目标中点电流,从而使母线中点电压波动最小。在此基础上进一步限制注入的零序电压的取值范围,可使得串联双管工作在基频,同时限制共模电压的幅值不超过母线电压的1/4。实验结果表明了该控制策略的有效性。
A multi-purpose optimal control strategy of a five-level active neutral-point clamped(ANPC) inverter was studied in this paper, including the neutral-point(NP) potential balancing control, switching frequency optimization and common-mode voltage reduction. A NP potential balancing algorithm based on zero-sequence voltage injection was presented. By calculating the NP currents of all key zero-sequence voltages, the most appropriated zero-sequence voltage was selected to generate the demanded NP current, which can make the NP voltage ripple lowest. In addition, by further limiting the region of injected key zero-sequence voltages, the series connected IGBTs can operate at fundamental frequency and the amplitude of common-mode voltage can be reduced to a quarter of the DC-link voltage. Experimental results are presented to verify the validity of this control strategy.
出处
《电工技术学报》
EI
CSCD
北大核心
2014年第6期129-135,共7页
Transactions of China Electrotechnical Society
关键词
五电平有源中点钳位
多电平变换器
零序电压
中点电压平衡
共模电压
Five-level neutral-point clamped
multilevel converter
zero-sequence voltage
neutral-point potential balancing
common-mode voltage