电力系统自动化2017，Vol.41Issue(21)：127-132,6.DOI:10.7500/AEPS20170413004
针对电网阻抗的大型光伏并网系统稳定性分析与提高策略
Analysis and Improvement Strategy for Stability of Large-scale Grid-connected Photovoltaic System Considering Grid Impedance
摘要
Abstract
In the large-scale grid-connected photovoltaic(PV)system,the multi-inverter paralleled structure is used to improve the capacity of the system.According to this structure,as PV capacity is increased,the value of grid impedance can be equivalently enlarged with respect to a single PV power generation unit,which will directly result in failure of the control strategy for inverters,and finally a failure of connecting the PV system to grid.Based on the switch averaged model of the grid-connected PV system,this paper analyzes the influence of grid impedance on inverter output current and voltage.Then, by the output current feedback method,the automatic coordination between reference current and actual output current is realized to equivalently eliminate the influence of grid impedance on the stability of grid-connected voltage and the power quality,so as to guarantee the normal operation of system.Finally,the correctness of the theory is verified by the simulation analysis and experiment.关键词
大型光伏并网系统/电网阻抗/稳定性/电能质量/虚拟阻抗Key words
large-scale grid-connected photovoltaic system/grid impedance/stability/power quality/virtual impedance引用本文复制引用
张前进,周林,解宝..针对电网阻抗的大型光伏并网系统稳定性分析与提高策略[J].电力系统自动化,2017,41(21):127-132,6.基金项目
国家自然科学基金资助项目(51477021).This work is supported by National Natural Science Foundation of China(No.51477021). （51477021）
