基于新型改进谐振控制器的APF无谐波电流提取 控制策略  

APF Control Strategy Without Harmonic Current Extraction Based on Novel Improved Resonance Controller

作　　者：刘可 王轩 车克衫 赵金朝 LIU Ke;WANG Xuan;CHE Keshan;ZHAO Jinzhao(State Grid Qinghai Electric Power Research Institute,Xining 810000,China)

机构地区：[1]国网青海省电力公司电力科学研究院,西宁810000

出　　处：《电力电容器与无功补偿》2021年第4期147-153,共7页Power Capacitor & Reactive Power Compensation

摘　　要：为了消除传统谐波电流提取环节对APF动稳态性能的影响,本文提出一种dq坐标系下基波电流与谐波电流分环解耦的新型控制结构。通过分环解耦,基波电流控制环只跟踪控制直流量,以实现直流侧电压稳定。谐波电流控制环利用改进谐振控制的选频特性,将负载电流直接送入谐波电流环,无需进行谐波分量提取,从而消除谐波提取环节带来的指令信号误差和延时。为提高系统相位裕度,本文提出一种新型改进谐振控制器,在余弦内模谐振控制器基础上引入一个实轴右半侧的零点,并在离散域下展开频率特性对比和参数影响分析。最后,通过实验验证了所提方法的有效性。In order to eliminate the influence of traditional harmonic current extraction chain on the dynamic and steady performance of APF,a kind of novel control structure for the split loop decoupling of fundamental current and harmonic current in dq coordinates is proposed in this paper.Through the split loop decoupling,the fundamental current control loop only tracks and controls the DC component to achieve the voltage stability at DC side.The harmonic current control loop feeds the load current directly into the harmonic current loop by taking the frequency selection characteristics of resonance control without the harmonic component extraction,thus eliminating the command signal error and time delay due to harmonic extraction.For improving the phase margin,a kind of novel improved resonance controller is proposed,in which a zero point on the half right side of the real axis is introduced into the cosine internal mode resonance controller.Then,the frequency characteristic comparison and parameter influence analysis are performed in discrete domain.Finally,the effectiveness of the proposed method is verified by the experiment.

关 键 词：有源电力滤波器 谐振控制 谐波提取 dq坐标系 相位裕度 

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