检测电流包含电容电流的SAPF谐波抑制和谐振阻尼新方法  

An Improved Method of SAPF for Harmonic Compensation and Resonance Damping with Detected Current Including Power Capacitor and Load Current

作　　者：张雨潇[1] 戴珂[1] 陈新文[1] 张三洪[2] 康勇[1] Zhang Yuxiao;Dai Ke;Chen Xinwen;Zhang Sanhong;Kang Yong(State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan,430074,China;Central China Grid Company Limited,Wuhan,430077,China)

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学电气与电子工程学院),武汉430074 [2]国家电网公司华中分部,武汉430077

出　　处：《电工技术学报》2017年第A01期58-67,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51277086)

摘　　要：研究一个由并联型有源电力滤波器(SAPF)和并联电容器组成的混合补偿系统,其中并联电容器的容性阻抗会与配电网的感性阻抗发生并联谐振。当检测电流中不包含电容电流时,SAPF可以抑制谐波和阻尼谐振且系统稳定;当检测电流中包含电容电流时,SAPF采用传统方式补偿会使得系统谐振频率向高频漂移。针对SAPF检测电流包含电容电流情况,提出一种改进的控制方法。该方法基于谐波电流分频控制策略,将高于谐振频率的抑制电流指令取反,低于谐振频率的抑制电流指令保持不变,同时检测谐振频率附近的公共耦合点(PCC)电压构建虚拟阻尼电阻,并对虚拟电阻的电导值进行闭环调节。采用该方法补偿后的网侧电流和PCC电压均满足电能质量标准。最后进行了仿真和实验验证。Firstly,this paper presents a hybrid compensation system with shunt active powerfilter(SAPF)and power capacitors.However,parallel resonance between inductive grid impedance andcapacitive impedance will occur in this system.With traditional method,hybrid system is stable whencapacitor current is not included in the detected current.But,when capacitor current is included,thedetected current will be amplified and resonance frequency will be shifted to higher frequency.Then,an improved method that reversing part of SAPF compensation reference current whose spectra higherthan resonance frequency is proposed.Points of common coupling(PCC)voltage is also detected forresonance damping which is helpful to mitigate harmonic distortion.At last,simulation and experimentresults are presented to verify the proposed method.

关 键 词：并联型有源电力滤波器 谐波补偿 谐振阻尼 并联电容器 

分 类 号：TM726.2[电气工程—电力系统及自动化]