LCL滤波器稳定性分析  

Stability Analysis of LCL Filter

作　　者：郭宝甫[1] 王卫星[1] 邓超然 徐军[1] 孙芊 GUO Bao-fu;WANG Wei-xing;DENG Chao-ran;XU Jun;SUN Qian(State Grid XJ Group Corporation,Xuchang 461000,China;Electric Power Research Institute,State Grid Henan Electric Power Company,Zhengzhou 450000,China)

机构地区：[1]国家电网许继集团有限公司,河南许昌461000 [2]国网河南省电力公司电力科学研究院,河南郑州450000

出　　处：《通信电源技术》2018年第11期34-36,共3页Telecom Power Technology

基　　金：国家电网总部科技项目资助(SGHADK00PJJS1700210)

摘　　要：LCL滤波比L滤波具有更好的滤波特性,广泛应用在各种变流器中。但是LCL滤波器是三阶系统,存在谐振尖峰,系统稳定性差。为解决上述问题,文章提出从变流器侧进行电压电流取样的方法,并通过改变闭环控制方式,解决了变流器输出功率存在偏差的问题。仿真结果表明,文章提出的方法较好地解决了LCL滤波的谐振问题,具有一定的工程应用价值。LCL filter has better filtering characteristics than L filter and is widely used in various converters.However,LCL filter is a third-order system with resonance peaks and poor stability.In order to solve the above problems,this paper proposed a method of voltage and current sampling from the converter side,and solved the problem of output power deviation by changing the closed-loop control mode.The simulation results showed that the proposed method solved the resonance problem of LCL filter better and had certain engineering application value.

关 键 词：LCL滤波 变流器 虚拟阻抗 

分 类 号：TM46[电气工程—电器]