摘要电力电子在各行各业飞速发展，向人们展示了他们强大的性能的同时，产生的谐 波也对人们的生产和生活造成了不可忽视的影响。谐波对电能质量问题的影响引起越 来越多的关注。在本文中，有源电力滤波器的研究中，关键的性能对谐波电流检测的 做起到的效果有着很大的影响。我们要完成更好的补偿的前提就是要提前或者说准时 得到信息反馈。因此，前面的检测部分显得尤为重要。84395

本文首先人们研究的几种电力系统谐波检测法进行了原理分析，对其中的重点几 个做出了仔细的说明。 然后再用这几种检测方法分别和希尔伯特-黄变换法的效果进 行比较和数据分析比较。 

在深入研究希尔伯特-黄变换（HHT）的基础上，使用希尔伯特-黄变换检测谐波 电流得到补偿信号，并进行经验模态分解（empirical mode function,EMD），得到一 系列经验模态函数（intrinsic mode function,IMF）。对代表不同分量的 IMF 其进行 希尔伯特-黄变换，结果得出各次谐波的幅值、频率和相位。并以此来对谐波进行精 确的分析。再用 Matlab 中的 Simulink 对有源滤波器中的各个关键部位进行建模、仿 真。结果表明，希尔伯特-黄变换检测方法能更有效地分离谐波，实时性和准确性都 相对更高，并且是具有更好的动态性能的检测。 

毕业论文关键字：希尔伯特-黄变换，有源滤波器，方法探讨，建模和仿真，效果比较 

Abstract With the power electronics technology, power electronic devices of various power systems, the rapid development in industry, transport and households and increasingly widespread application, resulting in a large number of harmonics, adding to pollution of the grid, causing increasingly serious harm harmonics。 Influence of harmonics on power quality problems caused by more and more attention。 In this paper, single-phase shunt active power filter。 The study, the influence of harmonic current detection key performance。 Real-time, accurately detect transient changes in harmonic currents。 Active power filter is a prerequisite for accurate compensation。

First we discussed several methods of power system harmonic current detection and harmonic detection method based on wavelet transform and based。 Instantaneous reactive power theory analysis and simulation。 The results show that it is based on the function of harmonic detection method based on wavelet。 Choice, but harmonic detection is not available for Active Power Filters: based on instantaneous reactive power theory because of the low-pass filter。 Detects the cause slow dynamic response of active power filter。

Depth study of Hilbert - Huang Transform (HHT), then use the Hilbert - Huang Transform harmonic current detection。 Get harmonic signal, and empirical mode decomposition (empirical mode function, EMD), to give a series of empirical mode function (intrinsic mode function, IMF)。 Different IMF corresponding to different harmonic components, its Hilbert - Huang transform, the result of each harmonic amplitude, frequency and phase。 And in order to carry out precise harmonic analysis。 Then in MATLAB Simulink, Active filter in all the key parts of modeling and simulation。 The results show that, Hilbert - Huang transform detection method more effective separation of harmonics, higher precision, and is a better dynamic performance testing。

Keywords: Hilbert - Huang transform, active filters, Methods of modeling and simulation, the effect

目录

第一章 绪论 1

1。1 谐波的产生及其危害 1

1。2 谐波的分析和治理 3

1。2。1 无源电力滤波器