弱电网环境下基于Super-Twisting的单相并网逆变器电流控制策略  

Research on Current Control Strategy of Single-phase Grid-connected Inverter Based on Super Twisting in Weak Grid

作　　者：徐国荣 滕青芳[1,2] XU Guo-rong;TENG Qing fang(School of Automation and Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Rail Transit Electrical Automation Engineering Laboratory of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学自动化与电气工程学院,兰州730070 [2]兰州交通大学甘肃省轨道交通电气自动化工程实验室,兰州730070

出　　处：《兰州交通大学学报》2022年第5期61-71,共11页Journal of Lanzhou Jiaotong University

摘　　要：针对滤波参数摄动和电网阻抗变化会降低逆变器系统的稳定性,影响并网逆变器输出的并网电流质量等问题,设计了一种基于Super-Twisting的鲁棒电流控制器.首先,分析了电网阻抗对不同阻尼方法的影响;然后,在不考虑上述不确定因素的情况下,借助常规滑模控制方法简单、易于实现的优点,得到并网逆变器的等效控制律;最后,在考虑滤波参数摄动及电网阻抗变化的情况下重新建立单相并网逆变器系统的数学模型,并引入Super-Twisting消除不确定项所造成的影响.仿真和实验结果表明:所设计的控制器对滤波参数的摄动和电网阻抗的变化不敏感,并且表现出较强的鲁棒性,从而能够提高入网电流质量.Aiming at the problem that the perturbation of filter parameters and the change of grid impedance will reduce the stability of inverter system and affect the grid connected current quality of grid connected inverter output, a robust current controller based on Super Twisting is designed.Firstly, the influence of grid impedance on different damping methods is analyzed;Then, without considering the above uncertainties, the equivalent control law of grid connected inverter is obtained by using the advantages of simple and easy implementation of conventional sliding mode control method;Finally, considering the perturbation of filter parameters and the change of grid impedance, the mathematical model of single-phase grid connected inverter system is re-established, and Super Twisting is introduced to eliminate the influence caused by uncertainty.Simulation and experimental results show that the designed controller is insensitive to the perturbation of filter parameters and the change of grid impedance with strong robustness, which can improve the quality of grid current.

关 键 词：并网逆变器 混合阻尼 并网电流质量 Super-Twisting 

分 类 号：TM464[电气工程—电器]