单相LCL型并网逆变器准比例谐振控制  

Quasi-proportional Resonance Control of the Single Phase LCL Grid-connected Inverter

作　　者：张晓凤 张杰 杜伟 杨浩 蒋何 ZHANG Xiaofeng;ZHANG Jie;DU Wei;YANG Hao;JIANG He(College of electrical engineering,Southwest Minzu University,Chengdu,Sichuan 610041)

机构地区：[1]西南民族大学电气工程学院,四川成都610041

出　　处：《绵阳师范学院学报》2025年第2期42-49,共8页Journal of Mianyang Teachers' College

基　　金：西南民族大学研究生创新型科研项目(YCYB2024083)。

摘　　要：针对PI控制对逆变交流信号无法实现无静差控制的问题,提出一种准比例谐振(QPR)控制策略,以提高电网基波频率处的增益,进而实现对正弦交流信号更好地跟踪控制.同时,针对LCL型滤波器存在谐振尖峰的问题,提出基于电容电流比例反馈的有源阻尼策略,构建电容电流内环与并网电流外环的双电流环控制结构,实现谐振尖峰抑制.为验证所提控制策略与控制结构的有效性,利用QPR控制及电容电流比例反馈有源阻尼策略构建单相LCL型并网逆变器仿真模型进行仿真验证,仿真结果表明所提控制策略使并网电流幅值误差约为0.03%,并网电流总谐波失真率为1.47%,有效降低了逆变交流信号的跟踪控制误差,提高了并网电流的质量,且具备良好的动态性能,验证了所提QPR控制的适应性.A quasi-proportional resonance(QPR)control strategy was proposed for the problem that PI con-trol cannot achieve static-free control of inverted AC signals,in order to improve the gain at the fundamental fre-quency of the grid,and then achieve better tracking control of sinusoidal AC signals.Meanwhile,for the problem of resonance spikes in LCL filters,this paper proposes an active damping strategy based on capacitor current propor-tional feedback,and constructs a dual current loop control structure with capacitor current inner loop and grid-connected current outer loop to achieve resonance spike suppression.In order to verify the effectiveness of the pro-posed control strategy and control structure,a single-phase LCL grid-connected inverter simulation model was con-structed using the QPR control and capacitor current proportional feedback active damping strategy for simulation verification,and the simulation results showed that the proposed control strategy made the grid-connected current amplitude error about 0.03%and the total harmonic distortion of grid-connected current 1.47%,which effectively reduced the tracking and control error of the inverted AC signal.It effectively reduced the tracking control error of the inverter AC signal,improved the quality of the grid-connected current,and had good dynamic performance,which verified the adaptability of the proposed QPR control.

关 键 词：并网逆变器 LCL型滤波器 QPR控制 有源阻尼 双电流环控制 

分 类 号：TM464[电气工程—电器]