高电压技术2023，Vol.49Issue(12)：5196-5206,11.DOI:10.13336/j.1003-6520.hve.20230410
不平衡电网下并网逆变器阻抗建模及稳定性分析
Impedance Modeling and Stability Analysis of Grid-connected Inverter Under Unbalanced Grid
摘要
Abstract
In order to analyze the system stability of grid-connected inverter under unbalanced grid,this paper first es-tablishes an output sequence impedance model of grid-connected inverter based on the traditional synchronous reference frame phase locked loop(SRF-PLL).It is found that the negative sequence fundamental frequency voltage of the grid has a negligible influence on the output impedance of the inverter,while the unbalanced three-phase grid impedance will se-riously affect the stability of the system.Then,in order to improve the stability of the system under unbalanced grid,a small signal model of dual second order generalized integrator phase locked loop(DSOGI-PLL)is established,and the output sequence impedance model of inverter based on DSOGI-PLL is derived.It is found that DSOGI-PLL can signifi-cantaly improve the system stability under the condition of grid voltage imbalance and impedance imbalance.Finally,the corresponding simulation and experimental verification are carried out,and the theory in this paper is confirmed experi-mentally.关键词
不平衡电网/并网逆变器/阻抗建模/DSOGI-PLL/StarSimKey words
unbalanced grid/grid-connected inverter/impedance modeling/DSOGI-PLL/StarSim引用本文复制引用
解宝,李萍宇,苏建徽,郑伟珂,施永,刘甜甜..不平衡电网下并网逆变器阻抗建模及稳定性分析[J].高电压技术,2023,49(12):5196-5206,11.基金项目
安徽省自然科学基金青年项目(2208085QE165) （2208085QE165）
中央高校基本科研业务费专项资金(JZ2021HGQA0194) （JZ2021HGQA0194）
高等学校学科创新引智计划(BP0719039) （BP0719039）
台达电力电子科教发展计划(DREG2022010).Project supported by Youth Project of Anhui Natural Science Foundation(2208085QE165),Fundamental Research Funds for Central Universities(JZ2021HGQA0194),111 Project(BP0719039),Power Electronics Science and Education Development Program of Delt Group(DREG2022010). （DREG2022010）
