电网技术2024，Vol.48Issue(4)：1672-1680,中插76,10.DOI:10.13335/j.1000-3673.pst.2023.0428
弱电网下LCL型并网逆变器高鲁棒性并网电流反馈有源阻尼策略
High Robustness Grid Current Feedback Active Damping Strategy for LCL-type Grid-connected Inverter in Weak Grid
摘要
Abstract
The grid-current-feedback-active-damping control strategy(GCFAD)has the function to effectively suppress the resonance peak of the LCL-type grid-connected inverter without requiring additional sensors.The GCFAD strategy is often used together with the grid voltage feedforward strategy to improve the quality of the grid current in a weak and disturbing grid.However,it is found that the positive resistance characteristics of the virtual impedance in the middle and low frequency bands under the traditional GCFAD strategy may cause a phase lag of the output impedance in the middle band,which reduces the robustness of the system when the grid voltage feedforward strategy is involved.In order to solve this problem,this paper proposes a high robustness grid-current-feedback-active-damping strategy(HR-GCFAD),which makes the virtual impedance exhibit positive resistance characteristics at high frequencies to suppress the LCL resonance peak and strengthen the stability of the system.It exhibits negative resistance characteristics in the middle and low frequency bands,which improves the robustness of the grid-connected inverter in a weak grid.Theoretical analysis and experimental results fully verify the effectiveness of the proposed strategy.关键词
LCL型并网逆变器/有源阻尼/鲁棒性/并网电流反馈Key words
LCL-type grid-connected inverter/active damping/robustness/grid current feedback分类
信息技术与安全科学引用本文复制引用
董光德,徐泽众,孙鹏菊,李强,陈咏涛..弱电网下LCL型并网逆变器高鲁棒性并网电流反馈有源阻尼策略[J].电网技术,2024,48(4):1672-1680,中插76,10.基金项目
国网重庆市电力公司科技项目(SGCQDK00DPJS2200300).Project Supported by Science and Technology Project of State Grid Chongqing Electric Power Company(SGCQDK00DPJS2200300). （SGCQDK00DPJS2200300）
