并联三相逆变器环流的双变零矢量控制研究

马璐; 刘莉; 雷蕾; 陈启宏

引用本文:	马璐,刘莉,雷蕾,等.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.
	MA Lu,LIU Li,LEI Lei,et al.Research on circulation current control of double changed zero vector for parallel three-phase inverters[J].Power System Protection and Control,2017,45(21):74-81

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并联三相逆变器环流的双变零矢量控制研究
马璐¹,刘莉¹,雷蕾²,陈启宏¹
(1.武汉理工大学自动化学院，湖北武汉 430070;2.神龙汽车有限公司，湖北武汉 430056)

摘要:

并联三相逆变器的参数不可避免地存在差异，导致逆变器间会产生环流。环流会造成逆变器损耗增加、输出电压、电流波形畸变等危害。为了解决这个问题，提出通过零序占空比来抑制环流的控制策略。在建立零序环流数学模型的基础上，针对传统零序环流控制策略中基于空间矢量脉宽调制(SVPWM)算法中一个载波周期内仅单次调节零矢量的作用时间，导致环流抑制效果不佳的问题，提出在一个载波周期内进行两次零矢量作用时间调节，提高零序环流控制实时性；并基于各逆变器输出的瞬时功率反馈来实现并联逆变器负载功率自适应均分的控制方案。该方案不仅能够很好地抑制环流，实现负载均分，而且能显著地改善三相逆变器输出电压和电流波形。通过仿真和半实物仿真实验平台验证了该方案的有效性。

关键词: 三相逆变器零序环流 SVPWM 负载均分

DOI：10.7667/PSPC161727

分类号:

基金项目:国家自然科学基金资助项目(61374050)

Research on circulation current control of double changed zero vector for parallel three-phase inverters

MA Lu¹,LIU Li¹,LEI Lei²,CHEN Qihong¹

(1. School of Automation, Wuhan University of Technology, Wuhan 430070, China;2. Dongfeng Peugeot Citroen Automobile Company Ltd, Wuhan 430056, China)

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. This work is supported by National Natural Science Foundation of China (No. 61374050).

Key words: three-phase inverter zero sequence circulation current SVPWM load sharing

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