弱电网下LCL型并网逆变器的改进稳定性控制方法  

Improved stability control method of LCL-type grid-connected inverter under weak grid

作　　者：石锋杰[1] 马雁[1] 许多 辛业春[2] Shi Fengjie;Ma Yan;Xu Duo;Xin Yechun(College of Electrical Engineering,Zhengzhou Electric Power College,Zhengzhou 450000,China;School of Electrical Engineering,Northeast Electric Power University,Jilin 132012,China)

机构地区：[1]郑州电力高等专科学校电力工程学院,河南郑州450000 [2]东北电力大学电力工程学院,吉林吉林132012

出　　处：《可再生能源》2023年第12期1700-1704,共5页Renewable Energy Resources

基　　金：河南省科技厅重点研发与推广专项(科技攻关)项目(212102210270)。

摘　　要：弱电网下并网点电压谐波和电网阻抗不可忽略。LCL型并网逆变器考虑电网阻抗后会发生谐振频率平移现象,同时并网点电压谐波会影响电压前馈控制效果。文章在并网电流结合电容电流反馈的基础上,通过修改电容电流反馈系数应对电网阻抗,提出了一种查表法的电容电流反馈系数选取方法。通过多谐振并网点电压前馈控制通道的控制器应对电压谐波。实验验证了文章所提改进稳定性控制方法的有效性。The voltage harmonics and grid impedance of the grid connection points under weak current networks cannot be ignored.The LCL type grid connected inverter will experience resonance frequency shift after considering the grid impedance,and the voltage harmonics at the grid connection point will affect the voltage feedforward control effect.Based on the combination of grid connected current and capacitor current feedback,this paper proposes a table lookup method for selecting the capacitor current feedback coefficient by modifying the capacitor current feedback coefficient to address the presence of grid impedance.By improving the controller of the multi-resonant voltage feedforward control channel at the grid connection point,voltage harmonics can be addressed.The effectiveness of the improved stability control method proposed in this article has been verified through experiments.

关 键 词：弱电网 电容电流反馈 电压前馈 改进稳定性控制 

分 类 号：TK01[动力工程及工程热物理] TM464[电气工程—电器]