LCL滤波并网逆变器多速率重复控制策略  

Multirate Repetitive Control Strategy for Grid-connected Inverter with LCL Filter

作　　者：杨兴武[1] 陈磊[1] 牛梦娇 YANG Xingwu;CHEN Lei;NIU Mengjiao(Shanghai Engineering Research Center of Green Energy Grid-connected Technology,Shanghai University of Electric Power,Shanghai 200090,China)

机构地区：[1]上海电力学院绿色能源并网工程技术研究中心

出　　处：《高电压技术》2018年第10期3231-3240,共10页High Voltage Engineering

基　　金：国家自然科学基金(51207086);上海市教育委员会科研创新项目(14YZ126);上海绿色能源并网工程技术研究中心资助项目(13DZ2251900)~~

摘　　要：为减少逆变器输出的谐波和降低数字控制器的计算负担及内存消耗,提出一种应用于LCL滤波并网逆变器的多速率重复控制（MRC）策略,包含高采样速率的并网电流反馈控制和低采样速率的重复控制两个环节。通过对系统的稳定性分析,动态、稳态性能分析,与传统单采样速率重复控制（SRC）相比,MRC系统可保持良好的动态、稳态性能,且稳定裕度得到提高。仿真和实验结果显示,当电网电压畸变率4.6%,将采样因子设为2,MRC控制器的运算效率提高,系统动态性能良好,逆变器输出电流的畸变率保持在1.5%以内,从而验证了理论分析的正确性、所提控制策略的有效性和可行性。In order to decrease the harmonics caused by inverter and reduce the computational burden and memory consumption of digital controller, we proposed a multispeed repetitive control（MRC） strategy for grid-connected inverter with LCL filter, which consists of grid current feedback control with a high sampling rate and repetitive control with reduced sampling rate. Through analyzing the stability of system as well as the dynamic and steady-state performances, we conclude that MRC system can maintain good dynamic and steady-state performances while the stability margin is enhanced, compared with conventional single sampling-rate repetitive control（SRC）. Simulation and experimental results show that the operation efficiency of MRC controller is improved, the system has good dynamic performance, and the distortion of output current can be kept within 1.5%. The results are obtained under the condition that the distortion of grid voltage is 4.6% and sampling factor is set to 2, which verify the correctness of theoretical analysis, effectiveness and feasibility of the proposed control strategy.

关 键 词：并网逆变器 多速率重复控制 稳定裕度 计算负担 电流质量 

分 类 号：TM464[电气工程—电器]