电源学报2024，Vol.22Issue(2)：158-166,9.DOI:10.13234/j.issn.2095-2805.2024.2.158
一种提高变流器弱电网适应能力的虚拟阻抗控制策略
Virtual Impedance Control Strategy for Improving the Adaptability of Converter to Weak Grid
摘要
Abstract
The large grid inductance in weak grid may cause a grid-connected converter to be unstable.Therefore,an impedance model of grid-connected converter is built at first,and the influence of grid inductance on the stability of grid-connected converter is analyzed according to the impedance ratio criterion.Then,aimed at the problem of low adaptability of the grid-connected converter to inductive grid impedance,a virtual impedance control strategy based on band-pass filter is proposed,and the influence of virtual resistance value on the adaptability of grid-connected converter to weak grid is studied.Furthermore,a selection principle for the virtual resistance value is also given.Finally,a system simulation model is built,and simulation results verify the correctness of theoretical analysis and the effectiveness of the proposed control strategy.关键词
弱电网/并网变流器/虚拟阻抗/带通滤波/稳定性Key words
Weak grid/grid-connected converter/virtual impedance/band-pass filter/stability分类
信息技术与安全科学引用本文复制引用
杨树德,李旺,张新闻,蔡长虹,高雄鹰,周鑫..一种提高变流器弱电网适应能力的虚拟阻抗控制策略[J].电源学报,2024,22(2):158-166,9.基金项目
江苏省高等学校自然科学研究资助项目(19KJB470038) （19KJB470038）
宁夏自然科学基金资助项目(2020AAC03210) （2020AAC03210）
国家自然科学基金资助项目(51867001)This work is supported by Natural Science Foundation of the Jiangsu Higher Education Institutions under the grant 19KJB 470038 （51867001）
Ningxia Natural Science Foundation under the grant 2020AAC03210 （）
National Natural Science Foundation of China under the grant 51867001 （）
