LCL型并网逆变器新型频率自适应重复控制方法  

A new frequency adaptive repetitive control approach for grid-connected inverter with LCL filter

作　　者：陈磊[1] 季亮[1] 杨兴武[1] 欧阳武 牛梦娇 

机构地区：[1]上海绿色能源并网工程技术研究中心(上海电力学院),上海200090 [2]国网南昌供电公司,江西南昌330000

出　　处：《电力系统保护与控制》2017年第23期57-64,共8页Power System Protection and Control

基　　金：国家自然科学基金项目(51207086);上海市青年科技英才扬帆计划(16YF1404800);上海绿色能源并网工程技术研究中心资助项目(13DZ2251900)~~

摘　　要：提出一种应用于LCL型并网逆变器的新型频率自适应重复控制(FARC)方法。该方法采用全通滤波器来替代重复控制器中频率比值小数部分构成的延时单元。当电网频率变化时,通过在线调整全通滤波器的系数,使重复控制器内模的谐振频率逼近电网基波及谐波频率的实际值,从而实现在电网频率变化情况下对电压谐波的有效抑制,进而控制逆变器输出高质量的并网电流。详细给出FARC的设计过程及系统的稳定性分析。仿真和实验结果验证了所提控制方法的有效性和可行性。This paper proposes a new Frequency Adaptive Repetitive Control （FARC） approach for grid-connected inverter with LCL filter, which utilizes all-pass filter to approximate the delay unit of the frequency ratio＇s fractional parts of the repetitive controller. When the frequency varies, it makes the resonant frequencies of the internal model of repetitive controller be close to the practical grid fundamental and harmonic frequencies by tuning the coefficients of all-pass filter on-line. The proposed approach can achieve the effective suppression of harmonic in grid and ensure that the inverter output high quality grid-connected current when frequency varies. The design processes of FARC and system stability analysis are given in detail. Simulation and experimental results verify the effectiveness and feasibility of the proposed control approach.

关 键 词：并网逆变器 频率变化 重复控制 全通滤波器 电流质量 

分 类 号：TM464[电气工程—电器]