LCL光伏并网逆变器的反步法稳定控制器研究  

Research on Backstepping Stability Controller of LCL Type Grid-connected Photovoltaic Inverters

作　　者：丁欣[1] 罗昕[1] 郑春强 DING Xin;LUO Xin;ZHENG Chunqiang(Guangxi Vocational College of Water Resources and Electric Power,Guangxi Nanning 530023,China)

机构地区：[1]广西水利电力职业技术学院,广西南宁530023

出　　处：《广西电力》2022年第1期14-19,47,共7页Guangxi Electric Power

基　　金：广西高等学校高水平创新团队及卓越学者计划资助项目(桂教人才[2020]6号);2021年度广西职业教育教学改革研究项目(GXGZJG2021B102);2021年度广西高校中青年教师科研基础能力提升项目(2021KY1091)。

摘　　要：针对单相光伏并网逆变器的稳定性问题,以LCL型逆变器为研究对象,采用反步法控制器,通过逐步引入系统状态误差变量,构建李雅普诺夫函数,利用递归修正算法得到控制律,从而实现系统的镇定和跟踪调节,保证了LCL型并网逆变器系统的全局稳定。实验室搭建了2 kW的单相逆变器样机,通过MATLAB/simulink仿真和样机实验可知,本文所提方法实现了入网电流零误差跟踪,总电流谐波含量少,有快速动态性能和强鲁棒性。Aiming at solving the stability problem of single-phase grid-connected photovoltaic inverters, the LCL type inverter is taken as the research object. By using the backstepping controller which gradually introduces the system state error variable, the Lyapunov function is constructed. The control law is obtained by using the recursive correction algorithm, so as to realize the stabilization and tracking regulation of the system, which ensure the global stability of the LCL grid-connected inverter system. A 2 kW singlephase inverter prototype was built in the laboratory. Through MATLAB/simulink simulation and prototype experiments, it can be seen that the method proposed in this paper realizes zero-error tracking of grid current, reduced total current harmonic content, fast dynamic performance and strong robustness.

关 键 词：并网逆变器 反步法 小信号模型 李雅普诺夫函数 

分 类 号：TM464[电气工程—电器]