电气传动2016，Vol.46Issue(11)：24-28,5.DOI:10.19457/j.1001-2095.20161106
并联无隔离光伏并网逆变器漏电流和环流抑制研究
Leakage Current and Circulating Current Reduction for Parallel Non-isolated Grid-connected Inverters
摘要
Abstract
The parallel non-isolated photovoltaic grid connected inverter can generate leakage current and circulating current. Analyzed the equivalent model of three-level inverter and usesd improved LCL filter whose capacitor common connection point connectes DC-side capacitor neutral point to filter out high frequency component of the parasitic capacitance voltage,and to reduce common mode leakage currents. Non-isolated photovoltaic grid connected inverter could increase system capacity and scalability in parallel,but the zero sequence circulating current could reduce the system efficiency,and then the traditional method is difficult to achieve the circulation suppression. A novel SVM modulation method was proposed. This method could realize the precise control by changing the function time of zero vector in real time and could achieve circulating current restrain of more than one inverters in the unequal current situation. Finally,the experimental results show that the proposed topology and algorithm are effective.关键词
逆变器并联/漏电流/环流Key words
parallel inverters/learage current/circulating current分类
信息技术与安全科学引用本文复制引用
张贞艳,高磊,张锦..并联无隔离光伏并网逆变器漏电流和环流抑制研究[J].电气传动,2016,46(11):24-28,5.基金项目
宿迁市工业科技支撑计划项目(Z201542) （Z201542）
江苏省自然科学基金青年基金项目(BK20140586) （BK20140586）
江苏省高校品牌专业建设项目(PPZY2015C252) （PPZY2015C252）
