【作者】 薛薇；

【导师】 李永丽；

【作者基本信息】 天津大学 ， 电力系统及其自动化， 2007， 硕士

【摘要】 有源电力滤波器(Active Power Filter-APF)是近十几年发展起来的一种动态抑制谐波、补偿无功的新型电力电子装置,它可以对幅值和频率变化的谐波进行跟踪补偿,进而达到改善电能质量、增强电力设备的可靠性和稳定性,提高电力系统效率的目的。本文首先介绍了基于瞬时无功功率理论的两种谐波电流检测方法和有源电力滤波器技术的基本原理,阐述了并联型有源电力滤波器几种主要的控制策略及系统构成。以三相电路瞬时无功功率理论为基础,利用MATLAB/SIMULINK提供的电力系统工具箱(SimPowerSystems)对谐波电流的两种检测方法进行了建模与仿真。为了改进有源电力滤波器的控制及谐波抑制的效果,本文提出了不依赖被控对象模型的高阶微分器(High Order Differentiator-HOD),以及基于HOD设计的一种高阶微分反馈控制器(High Order Differential Feedback Controller-HODFC),经理论分析与仿真研究表明:该HOD具有良好的稳定性、准确性及较好的滤波特性,能高品质地提取信号的一阶微分和高阶微分;该HODFC不依赖于系统精确的数学模型,具有良好的鲁棒性。最后,本文首次将提出的HODFC应用于并联型有源电力滤波器的直流侧电压的控制中。通过MATLAB仿真分析表明:基于HODFC的并联型APF的控制系统具有控制效果好、参数调节容易、鲁棒性好等特点。本文对HODFC在有源电力滤波器中的应用进行了初步地探索,同时验证了HODFC在有源电力滤波器控制中的可行性和有效性。更多还原

【Abstract】 In the latest ten years, Active Power Filter (APF) is developed as a novel electronicdevice that can attenuate the harmonic and reactive currents. It can compensate theharmonics varying in amplitude and frequency, improve the power quality, enhance thereliability and stability of electrical equipments and improve the efficiency of the powersystem.This paper introduces two kinds of harmonic current detection methods based on theinstantaneous reactive power theory and the basic principles of shunt APF. And we alsopresent several major control strategies of the main circuit and the configuration ofsystems.Andthetwoharmoniccurrent detection methodsinthree-phasecircuitsbasedonthe instantaneous reactive power theory are modeled and simulated making use of PowerSystemToolbox(SimPowerSystem)inMATLAB/SIMULINK.To improve the control of APF and the effect of harmonic suppression, this paperproposes a high order differentiator (HOD), which does not depend on the system model,and designs a high order differential feedback controller (HODFC) based on the HOD.Both theoretical analysis and simulation results show that the HOD has good stability,high accuracy and good filter characteristics. And it can also extract one-order andhigh-order differential of the signal in high-quality. It can be proved that the HODFCsystem doesn’t depend on the precise mathematical model of system and has strongrobustness.Finally, this paper first applies the proposed HODFC to the control of DC sidevoltage in shunt APF. Simulation results show that the control system of shunt APF basedon HODFC has good control effects, easier parameter adjustment, strong robustness andso on. The problem of applying HODFC to APF is discussed preliminarily in this paperand the feasibility and effectiveness of HODFC in the field of APF control are alsoverified.更多还原