基于状态反馈精确线性化的LCL逆变器无源控制  

Passive Control of LCL Inverter Based on Precise Linearization of State Feedback

作　　者：丁欣[1] 吴慧芳[2] 覃贵芳 DING Xin;WU Huifang;QIN Guifang(Guangxi Vocational College of Water Resources and Electric Power,Nanning,Guangxi,530023;Guangxi Electrical Polytechnic Insitute,Nanning,Guangxi,530007)

机构地区：[1]广西水利电力职业技术学院,广西南宁530023 [2]广西电力职业技术学院,广西南宁530007

出　　处：《红水河》2020年第4期43-45,54,共4页Hongshui River

基　　金：2018年度广西高校中青年教师基础能力提升项目《光伏发电单相并网逆变器的设计与研究》(2018KY1122);2019年度广西高校中青年教师基础能力提升项目《模块化多电平柔性直流输电系统研究》(2019KY1332)。

摘　　要：为保证并网逆变器输出电流质量,抑制总谐波畸变率,笔者以LCL型并网逆变器作为研究对象,提出一种基于完全状态反馈精确线性化的无源控制策略。该控制方法针对LCL滤波器,以无源能量函数为目标,求取最优二次型理论的Q矩阵,从而得出最优状态反馈系数和原系统下的最优控制律,保证了并网逆变器大范围全局稳定。文中利用Matlab/Simulink仿真软件建立了仿射非线性模型,仿真结果表明:该方法实现了逆变器输出无稳态误差,保证了较好的稳态性能和动态性能。In order to ensure the output current quality of grid connected inverter and restrain the total harmonic distortion,taking LCL type grid-connected photovoltaic inverter as the research object,a passive control strategy based on complete state feedback precise linearization is proposed.Aiming at the LCL filter and taking the passive energy function as the objective,the Q matrix of the optimal quadratic theory is obtained,and the optimal state feedback coefficient and the optimal control law of the original system are obtained,which ensures the global stability of the grid connected inverter in a wide range.In this paper,the affine nonlinear model is established by using Matlab/Simulink simulation software.The simulation results show that this method can realize the inverter output without steady-state error and ensure good steady-state and dynamic performance.

关 键 词：并网逆变器 状态反馈 精确线性化 LCL逆变器 无源控制 

分 类 号：TM464[电气工程—电器]