摘要
非隔离光伏并网系统中共模电流高频分量的存在会使系统稳定性下降,在低功率运行时,对发电质量影响较大。单共模内回路法对高频分量抑制效果不理想。在构建共模电路等效模型,分析共模电流产生原因的基础上,提出了一种构建双共模内回路抑制共模电流高频分量方法。该方法在保证共模电流满足并网要求的前提下克服了单共模内回路发生高频谐振的缺点,很好地抑制了外部寄生回路共模电流中的高频分量。最后通过仿真和实验证明了所提方法的有效性。
The existence of high-frequency components in common-mode （CM） current wouldreduce the stability of non-isolated PV grid-connected system. In low power operation, it has greatimpacts on the output power quality. The single CM inner loop method in suppressing thehigh-frequency components was not ideal. Based on the CM equivalent circuit model and the causes ofthe CM current, a novel double CM inner loops method was proposed to restrain the high-frequencycomponents in CM current. This method not only meets the grid connection demand of CM current, butalso overcomes the high frequency resonant problem. Furthermore, the high-frequency components inCM current are substantially reduced. The simulating and experimental results have verified theproposed method.
作者
赵瑞广
刘栋良
崔丽丽
魏红梅
Zhao Ruiguang Liu Dongliang Cui Lili Wei Hongmei(College of Automation Hangzhou Dianzi University Hangzhou 310018 China Wolong Electric Co. Ltd Shangyu 312300 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2016年第22期186-193,共8页
Transactions of China Electrotechnical Society
基金
浙江省自然科学基金资助项目(LY15E070006)
关键词
非隔离
光伏并网系统
共模电流
内回路
高频分量
Non-isolated, PV grid-connected system, common-mode current, inner loop, highfrequencycomponent
