现代电力2024，Vol.41Issue(5)：971-983,13.DOI:10.19725/j.cnki.1007-2322.2022.0389
弱电网下并网变换器的高鲁棒性控制及稳定性分析
Strong Robustness Control and Stability Analysis of Grid-connected Converter in Weak Grids
孙姗姗 1吕志鹏 2李月恒3
作者信息
- 1. 上海电力大学电子与信息工程学院,上海市浦东新区 201306
- 2. 上海电力大学电子与信息工程学院,上海市浦东新区 201306||国网上海能源互联网研究院有限公司,上海市浦东新区 201210
- 3. 南京则鸣新能源技术有限公司,江苏省南京市 211500
- 折叠
摘要
Abstract
In practical terms,a large number of distributed power sources are connected to the grid,so that the variations in weak grid impedance can no longer be ignored.To enhance the robustness of grid connected converter against the vari-ations in grid impedance,an improved active damping control strategy is proposed to increase the positive and negative damp-ing boundary frequencies.A analysis was conducted on the in-fluence mechanism of the digital control delay on the system stability.In order to eliminate the negative influence of the delay on the active damping effect,a phase compensator was introduced into the damping control link to optimize the strategy,thus increasing the boundary frequencies of positive and negative damping to get closer to Nyquist frequency.The feedback coefficient for a wide variation range in grid imped-ance was designed to address the issue of resonant frequency shift caused by minor changes in grid impedance.The strong robustness of grid connected converter to grid impedance in weak grids was realized simultaneously.The analysis on the performance of the system reveals that when the LCL resonant frequency varies within Nyquist frequency,the system can maintain stability with this method.The research results demonstrate that the proposed active damping control strategy can significantly improve the adaptability to the impedance changes in the weak grid.The effectiveness of the proposed strategy and parameter design in achieving high robustness of weak grids is finally verified through simulation and experi-mental results.关键词
弱电网/高鲁棒性/数字控制延时/有源阻尼/谐波稳定性/相位补偿Key words
weak grid/high robustness/digital control delay/active damping/harmonic stability/phase compensa-tion分类
信息技术与安全科学引用本文复制引用
孙姗姗,吕志鹏,李月恒..弱电网下并网变换器的高鲁棒性控制及稳定性分析[J].现代电力,2024,41(5):971-983,13.
