基于重复控制的有源电力滤波器6k±1次谐波补偿  

Repetitive Control Based Compensation for 6k±1 Harmonics of Active Power Filter

作　　者：郑远辉[1] 杨苹[1,2] 王月武[1] 唐铖[3] 

机构地区：[1]华南理工大学电力学院,广东省广州市510640 [2]广东省绿色能源技术重点实验室华南理工大学,广东省广州市511458 [3]风电控制与并网技术国家地方联合工程实验室华南理工大学,广东省广州市511458

出　　处：《电力系统自动化》2016年第16期125-131,共7页Automation of Electric Power Systems

基　　金：国家高技术研究发展计划(863计划)资助项目(2014AA052001)~~

摘　　要：采用重复控制(RC)有利于提高有源电力滤波器(APF)的补偿性能。针对三相整流电路产生的6k+1次谐波为正序量,6k-1次谐波为负序量的特点,提出了dq旋转坐标系下的选择性RC内核,用于补偿6k±1次谐波。为消除该RC内核存在的N/6拍延时不为整数的影响,引入基于Thiran近似法的无限脉冲响应(IIR)滤波器来逼近所需的分数延时特性,提高系统补偿性能。采用重复控制器串联比例—积分(PI)控制器的复合控制结构,并对该复合控制系统进行了理论推导及稳定性分析,进而给出了控制器的详细设计方法。最后通过仿真验证了所提方法的有效性和优越性。The compensation performance of active power filter （ APF） is improved by using repetitive control （ RC） . For the harmonic characteristic of a three‐phase rectifier , as 6k ＋ 1 order harmonics are positive sequence component , while 6k - 1 order harmonics are negative sequence component , a selective repetitive controller is proposed . This controller is designed to compensate for the 6k ± 1 order harmonics in the dq reference frame . In addition , the delay time of the proposed repetitive controller may not be an integer and will reduce the compensation performance . In order to eliminate the N /6 beat delay effect , an IIR filter based on Thiran approximation is introduced to approximate the desired fractional delay . In this paper , the composite control structure of PI controller in series with the proposed repetitive controller is used , and the theoretical derivation and stability analysis of the composite control system are carried out , till the detailed design method of the controller is provided . Finally , the effectiveness and superiority of the proposed method are verified by simulation .

关 键 词：有源电力滤波器 重复控制 分数延时 稳定性 

分 类 号：TM761[电气工程—电力系统及自动化] TN713.8[电子电信—电路与系统]