电力系统保护与控制2017，Vol.45Issue(21)：74-81,8.DOI:10.7667/PSPC161727
并联三相逆变器环流的双变零矢量控制研究
Research on circulation current control of double changed zero vector for parallel three-phase inverters
摘要
Abstract
Parameters of parallel three-phase inverters are inevitably different, which causes circulation current among inverters. Circulation current will increase energy loss, distortion of output voltage and current waveform, etc. In order to solve these problems, this paper proposes a control strategy that depresses circulation current by controlling zero sequence duty ratio. In SVPWM-based algorithm of traditional zero-sequence circulation control strategy, it only regulates the operating time once in a carrier cycle, resulting in poor circulation suppressing results. To solve the problem and on the basis of establishing zero-sequence circulated mathematical model, this paper proposes to carry out zero vector operating time twice in a carrier cycle to improve zero-sequence circulation suppressing real-timely, and realize the control scheme of shunt inverter load power adaptive sharing based on the instantaneous power feedback output by each inverter. The method can not only suppress circulation current, realize load sharing, but also can significantly improve output voltage and current waveform of three-phase inverters. The validity of the proposed method is verified by simulation and the semi-physical simulation experiment platform.关键词
三相逆变器/零序环流/SVPWM/负载均分Key words
three-phase inverter/zero sequence circulation current/SVPWM/load sharing引用本文复制引用
马璐,刘莉,雷蕾,陈启宏..并联三相逆变器环流的双变零矢量控制研究[J].电力系统保护与控制,2017,45(21):74-81,8.基金项目
This work is supported by National Natural Science Foundation of China (No.61374050). 国家自然科学基金资助项目(61374050) （No.61374050）
