基于滑窗DFT的有源电力滤波器重复控制.doc

PAGE PAGE 3 滑窗迭代DFT法APF直流侧稳压控制研究* 李锦彬1,2，陈冲1 （1.福州大学 电气工程与自动化学院，福州 350108；2.福建工程学院 信息科学与工程学院，福州 350108） 摘要：有源电力滤波器（APF）是抑制电网谐波的新型方法，其补偿性能主要取决于谐波检测环节和控制环节，同时直流侧稳压控制是APF正常工作的前提。本文引入滑窗迭代DFT谐波电流检测方法；提出一种稳压电流各相均分的直流电压控制策略；从功率平衡的角度分析了电压环PI调节器参数设计方法。建立仿真模型及设计实验样机，仿真和实验均验证了滑窗迭代DFT法谐波检测的快速性和精确性，以及所提直流侧稳压控制策略的正确性。 关键词：有源电力滤波器；滑窗迭代算法；稳压控制 中图分类号：TM993 文献标识码：A 文章编号：1001-1390（2015）00-0000-00 Research on DC side voltage control strategy of apf APF based on sliding-window iterative algorithm of DFT of DFT Li Jinbin1,2, Chen Chong1 (1. College of Electrical Engineering and Automation, Fuzhou University, Fuzhou350108,, Fujian 350108, China. 2. College of Information Science and Engineering, Fujian University of Technology, Fuzhou 350108, China.) Abstract: The active power filter(filter (APF) is a novel method of dynamic harmonic suppression.Thesuppression. The compensation performance of APF is determined by the link of detection and control.Atcontrol. At the same time,thetime, the DC voltage balance control is the prerequisite for APF to work normally.Thenormally. The detection method of harmonic current based on sliding-window iterative algorithm of DFT is described.Andintroduced in this paper. And a DC side capacitor voltage control strategy is proposed based on each phase split current.Thecurrent. The design method of PI parameter for voltage loop from the perspective of power balance.Thebalance, therefore, the simulation model is set up and the experimental prototype is designed. The correctness of sliding-window iterative algorithm of DFT and proposed DC side voltage control strategy is verified by simulation and experiment. Keywords: active power filter, sliding-window iterative algorithm, voltage balance control strategy 0 引 言 *基金项目：福建省教育厅资助项目（JA12229）随着非线性负载的不断增加，电力系统的谐波污染日趋严重，使其它用电设备的工作性能下降，甚至无法运行[1-2]。因此，谐波抑制技术成为当今的研究热点。APF是一种动态抑制谐波和补偿无功功率的新型电力电子装置[2-3]，谐波检测的精确度和快速性直接影响到APF的补偿性能。文献[4]提出了一种改进型DFT谐波电流检测方法，采用滑窗迭代算法，以空间换时间，谐波检测的快速性和精确性都很理想，但未提及直流侧电