中国电机工程学报Issue(34)：34-41,8.
电网阻抗对大型并网光伏系统稳定性影响分析
Stability Analysis of Large-scale Photovoltaic Plants Due to Grid Impedances
摘要
Abstract
The grid-connected photovoltaic (PV) system will become unstable when the grid impedance is large, especially when the large-scale PV plant was connected to a weak grid. In this paper, a Norton equivalent model of the three-phase paralleled inverters was established to study the stability of the large-scale grid-connected PV system including the grid impedance. The expression of the grid-connected current, the point of the common coupling (PCC) voltage and the closed loop characteristic equation of the system were derived. Then the stability of the large-scale grid-connected PV system was analyzed by the root locus. Finally, the study was validated through simulations. Studies show that there is no inter-phase coupling effect in the Norton equivalent model of the three-phase paralleled inverters, and the three-phase paralleled inverters can be converted to the single-phase paralleled inverters in order to study the characteristics. The large-scale grid-connected PV system will be unstable in some parameter regions depending on the grid impedance.关键词
大型光伏电站/并联逆变器/电网阻抗/诺顿等效模型/稳定性Key words
large-scale photovoltaic (PV) plants/paralleled inverters/grid impedance/Norton equivalent model/stability分类
信息技术与安全科学引用本文复制引用
周林,张密,居秀丽,何国庆..电网阻抗对大型并网光伏系统稳定性影响分析[J].中国电机工程学报,2013,(34):34-41,8.基金项目
国家863高技术基金项目(2011AA05A301) （2011AA05A301）
The National High Technology Research and Development of China 863 Program (2011AA05A301) （2011AA05A301）
