单相LCL型并网逆变器的延时减小与补偿方法  

Delay Reduction and Compensation Method of Single Phase LCL Grid Connected Inverter

作　　者：邓淞元 赵霞[1] DENG Song-yuan;ZHAO Xia(School of Automation and Electrical Engineering,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

出　　处：《兰州交通大学学报》2022年第1期83-89,共7页Journal of Lanzhou Jiaotong University

基　　金：国家自然科学基金(51767015);甘肃省自然科学基金(2016GS07210)。

摘　　要：数字控制的LCL单相并网逆变器会产生控制延时,这会严重影响系统环路特性.为了解决此问题,提出了一种基于双电流闭环即时采样与零极点补偿结合的控制策略.首先,分析了传统电容电流反馈控制的LCL并网逆变器产生的延时对系统有源阻尼特性的影响;其次,分析了并网电流环的延时对系统幅频特性的影响;之后,对电容电流环和并网电流环采用即时采样并在前向通路中加入零极点补偿,并对改善后的系统鲁棒性和稳定性进行分析.Matlab/Simulink仿真结果表明:系统的动态性能和鲁棒性得到了提高,所提出的改进措施能较好的减小延时.The digitally controlled LCL single-phase grid-connected inverter will produce control delay.This will seriously affect the system′s loop characteristics.In order to solve this problem,This paper proposed a control strategy based on the combination of double current closed-loop instant sampling and zero-pole compensation.First,the influence of the delay caused by the traditional capacitive current feedback control LCL grid-connected inverter on the active damping characteristics of the system was analyzed.Second,the influence of the grid-connected current loop delay was analyzed on the system amplitude-frequency characteristics.After that,real-time sampling was used for the capacitive current loop and the grid-connected current loop,and pole-zero compensation was added to the forward path.The robustness and stability of the improved system was analyzed.the Matlab/Simulink simulation results show that the dynamic performance and robustness of the system have been improved,so the improvement measures proposed in this paper can better reduce the delay.

关 键 词：LCL并网逆变器 数字控制 即时采样 零极点 鲁棒性 动态性能 

分 类 号：TM464[电气工程—电器]