考虑PQ环不对称效应的并网逆变器电网阻抗适应性提升方法  

A Method of Improving Grid Impedance Adaptability for Grid-Connected Inverters Considering Asymmetry Effect of PQ Power Loop

作　　者：王小源 宁志亳 卿梦琪 高家元 唐星祝 王慧娟 WANG Xiaoyuan;NING Zhihao;QING Mengqi;GAO Jiayuan;TANG Xingzhu;WANG Huijuan(State Grid Hunan Electric Power Company Limited Research Institute,Changsha 410208,China;School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,China;Hunan Xiangdian Test and Research Institute Co.,Ltd.,Changsha 410208,China)

机构地区：[1]国网湖南省电力有限公司电力科学研究院,湖南长沙410208 [2]长沙理工大学电气与信息工程学院,湖南长沙410114 [3]湖南省湘电试验研究院有限公司,湖南长沙410208

出　　处：《湖南电力》2025年第2期54-62,共9页Hunan Electric Power

基　　金：国网湖南省电力有限公司科技项目(5216A321N302)。

摘　　要：针对PQ(有功、无功)功率控制下并网逆变器难以适应较大电网阻抗的难题,提出一种考虑PQ功率环不对称效应的并网逆变器电网阻抗适应性提升方法。首先,构建PQ功率控制并网逆变器的小信号控制方框图,揭示有功、无功控制环的不对称效应。在此基础上,针对无功环控制器参数对并网逆变器稳定性影响较敏感的特性,提出一种基于相位补偿的有功、无功环控制器参数不对称设计方法,扩大并网逆变器对电网阻抗的适应范围,有助于新能源的高渗透率接入。最后,通过仿真与实验验证所提控制方法的正确性与有效性。Aiming at the difficulty of grid-connected inverters under PQ power control to adapt to large grid impedance,a method to enhance the grid impedance adaptability of grid-connected inverters considering the asymmetric effect of PQ power loops is proposed.First,by constructing the small-signal control block diagram of the PQ power-controlled grid-connected inverter,the asymmetric effects of the active and reactive power control loops are revealed.On this basis,considering the characteristic that the parameters of the reactive power loop controller are more sensitive to the stability of the grid-connected inverter,an asymmetric design method for the active and reactive power loop controller parameters based on phase compensation is proposed,which significantly expands the adaptability range of the grid-connected inverter to grid impedance and aids in the high penetration rate access of new energy.Finally,the correctness and effectiveness of the proposed control method are verified through simulation and experimentation.

关 键 词：并网逆变器 电网阻抗 PQ控制 不对称 相位补偿 稳定性 

分 类 号：TM464[电气工程—电器]