摘要
随着电力电子装置的广泛应用及大量非线性负荷的投入运行，电力系统的谐波污染也日趋严重。传统用LC滤波装置虽然简单，但有一定的局限性。电力电子技术的发展，为电力系统谐波的治理提供了新的方法，采用有源滤波（Active Power Filter-APF）技术既可对电网的谐波进行抑制，改善电力线路的电流波形，还能补偿电网的无功功率，提高电网的功率因数。有源电力滤波器(APF)由于能动态补偿电网中各次谐波，且响应速度快而正成为治理谐波污染的最有效设备之一。电力有源滤波器作为目前谐波抑制非常行之有效的措施，对它的研究很有价值。
本文从传统的PPF（无源滤波器）和目前对谐波抑制非常有效的APF（有源滤波器）的比较入手，对两种滤波器进行全面的比较，从结构上和电路原理上分析了电力有源滤波器抑制谐波的原理，本文主要分析目前较为典型的并联型APF及其拓扑结构的特点。
本文以并联型APF为对象，选用基于瞬时无功功率理论的谐波电流的检测方法，克服了传统谐波电流检测方法实时性能差的缺点,并且容易实现，并且运用PWM的控制方法，运用PSIM仿真软件建立模型，进行仿真成功。
关键词：电力有源滤波器；谐波；瞬时无功功率理论；PSIM仿真；
Abstract
Power electronic devices with a wide range of applications and a large number of non-linear load operation, the harmonic pollution in power systems are becoming increasingly serious. The traditional simple LC filter, but have some limitations. The development of power electronics technology for the management of power system harmonics provides a new method, the use of Active Filter (Active Power Filter-APF) technology can be carried out on the grid harmonic suppression, power lines to improve the current waveform, but also compensation for reactive power grid and improve grid power factor. Active power filter (APF) as a result of dynamic compensation to the various harmonic grid, and the fast response and harmonic pollution is becoming the treatment of one of the most effective equipment. Active power filter harmonic current suppression, as a very effective measures, the study of it very valuable.
This article from the traditional PPF (filter out), and currently very effective harmonic suppression APF (APF) to start the comparison of two types of filters to conduct a comprehensive comparison of the structure and analysis of the circuit power active principle of harmonic suppression filter, this paper, a more typical analysis of the current shunt APF topology and its characteristics.
In this paper, shunt APF for the object, chosen based on instantaneous reactive power theory of the harmonic current detection methods, overcome the traditional harmonic current detection method of the shortcomings of poor real-time performance, and easy to implement. And the use of PWM control method, the use of PSIM simulation software simulation to establish a successful model.
Keywords：Active power filter; harmonics; instantaneous reactive power theory; PSIM simulation
