基于状态反馈的LCL型逆变器解耦控制策略  

State Feedback Based Decoupling Control Strategy for Grid-Connected Inverter with LCL Filter

作　　者：屈克庆[1] 李文旗[1] 叶天凯 赵晋斌[1] 李芬[1] 

机构地区：[1]上海电力学院电气工程学院,上海200090

出　　处：《电工技术学报》2016年第20期130-138,共9页Transactions of China Electrotechnical Society

基　　金：上海绿色能源并网工程技术研究中心资助项目(13DZ2251900)

摘　　要：为实现带LCL滤波器的三相电压源型并网逆变器(VSI)的无静差控制,通常采用abc/dq变换将静止坐标系转换为同步坐标系,但这种变换存在dq分量间的耦合问题。因此提出了一种基于双电感电流和电容电压反馈的三闭环解耦控制策略,该策略采用状态反馈实现了多输入多输出(MIMO)线性时不变系统动态解耦,不仅有效解决了dq分量间的耦合问题,而且在保证较高的入网电流质量的条件下改善了系统动态性能。仿真和实验结果均验证了该控制策略的可行性和有效性。Abc to dq transformation, which converts stationary reference frame to synchronous reference frame, is adopted to realize no static error control for three-phase grid-connected voltage source inverter （VSI） with LCL filter. However, this kind of coordinate transformation induces coupling impacts between d-axis and q-axis. Therefore, a double-inductor current and capacitor voltage three-closed-loop decoupling control strategy based on feedback is proposed. The proposed strategy realizes dynamic decoupling process of multiple-input multiple-output （MIMO） time invariant system by state feedback. It can not only effectively eliminate the coupling impacts, but also improve the dynamic performance with the high quality of grid-connected current. Simulation and experimental results have verified the proposed control strategy.

关 键 词：同步坐标系 LCL滤波器 并网逆变器 状态反馈 解耦控制 

分 类 号：TM464[电气工程—电器]