电力系统及其自动化学报2017，Vol.29Issue(1)：90-96,7.DOI:10.3969/j.issn.1003-8930.2017.01.015
电网不平衡条件下LCL滤波并网变换器控制
Control of LCL Filter Based Grid-connected Converter under Unbalanced Grid Voltage Conditions
摘要
Abstract
LCL filter has been widely used in grid-connected converter for its good filtering performance and small size. However,capacitor branch may cause resonance,thus the active damping based on capacitor current feedback is an ef⁃fective way to damp resonance peaks. Moreover,a proportional regulator is used in feedback loop,which can control the feedback strength and make the design of tuning process relatively independent. Under the unbalanced grid voltage , LCL filter based grid-connected converter is built,in which a proportional-resonant(PR)regulator is adopted in the sta⁃tionary αβ reference frame. According to the theory of root locus,the relationships among PR regulator,proportional regulator and LCL filter are analyzed,and appropriate parameters are selected to guarantee the stability of system. Fi⁃nally,the reasonability and feasibility of the control strategy and design method are verified by the simulation results of a 3.5 kV·A grid-connected converter.关键词
不平衡电网/LCL滤波器/比例谐振调节器/谐振尖峰/根轨迹Key words
unbalanced grid voltage/LCL filter/proportional-resonant(PR)regulator/resonant peak/root-locus分类
信息技术与安全科学引用本文复制引用
师晓樑,林文茂,万健如..电网不平衡条件下LCL滤波并网变换器控制[J].电力系统及其自动化学报,2017,29(1):90-96,7.基金项目
国家质检总局公益性行业科研专项经费项目 （）
