结论与展望 29
参考文献 30
致谢 31
1 绪 论
随着现在电子工业技术的发展,在电力系统中,非线性负荷大量增加,这样的非线性负荷在电网中产生的干扰越来越严重,也越来越复杂化,使得电网的供电质量越来越差。我们可以形象的把电力系统也看作是一种“环境”,这个环境也同样面临着各种污染。其中,谐波污染是电力系统的三大公害之一。
电力电子装置是电网中主要的谐波源。随着电力电子装置应用的日益广泛,电网中的谐波污染也日趋严重。另外,大多数电力电子装置功率因数很低,给电网带来额外负担,并严重影响供电质量。因此,抑制谐波和提高功率因数已成为电力电子技术、电气自动化及电力系统研究领域所面临的一个重大课题。
近年来,有源滤波器已成为电力系统研究领域中的热点,它是治理电力系统谐波污染的有效手段之一。有源电力滤波器(Active Power Filter-APF)即是一种用来动态抑制谐波和补偿无功的电力电子装置,它能对频率和幅值都发生变化的谐波和无功电流进行补偿,克服了无源电力滤波器等传统的谐波抑制和无功功率补偿方法的缺陷。有源电力滤波器补偿电流的检测和控制是决定其工作特性的两个关键性环节,直接影响到它的补偿精度和补偿速度[1]。因此,研究谐波和无功电流的实时检测和跟踪控制具有非常重要的意义。 摘要: 电力电子技术的发展,一方面方便变换和功率应用,同时给电力系统带来了电能质量问题更为严重,谐波问题,如电压波动和不平衡。有源电力滤波器 (ActivePowerFilter, APF)是一种补偿谐波电流和无功功率的现代电力电子设备,对比其他无源滤波等装置有不可比拟的优势。本文选择三相并联型有源电力滤波器作为研究对象。利用Matlab仿真软件搭建仿真模型,重点研究了谐波电流检测方法和电流跟踪控制策略。
本文介绍了有源电力滤波器的分类及其基本工作原理。通过计算有源电力滤波器的主要参数来选择主电路电力电子器件。研究了谐波和无功电流检测,并用Matlab对ip-iq检测法进行仿真,分析了有源电力滤波器ip-iq法中的补偿情况和适用范围。最后,通过无差拍控制原理对有源电力滤波器实现仿真,分析得出无差拍控制原理对电流控制的补偿情况。
毕业论文关键词:有源电力滤波器,电流控制,ip-iq法
Abstract:The rapid development of power electronics technology, on the one hand to the transformation and application of electric power has brought convenience, on the other hand, has brought the power quality is a serious problem to the power system, such as harmonic pollution, no power, voltage fluctuation and unbalance. ActivePower Filter (APF) is one kind of modern power electronics equipment which can compensate harmonic current and reactive power. This paper chooses three phase shunt APF to study. The thesisbuilds simulation model of APF using Matlab software, and focuses on the harmonic.
In this thesis, the classification and basic working principle of active power filter are mainly introduced. The main circuit of the power electronic devices are selected through the way of calculating the main parameters of the active power filter.Several methods of measuring harmonic and reactive power current are introduced and compared in this paper and MATLAB is employed to make the simulation for ip-iq method .At the same time, the compensation of active power filter ip-iq method and scope of application are analyzed also. Finally, through the deadbeat control principle of active power filter based on Simulation, the deadbeat control principle of compensation current control can be analyzed.