基于Matlab的电力系统谐波分析研究

论文编号:CK086论文字数:19905,页数:46

摘 要

我们在对低压配电柜的设计中，必须考虑到它的安全性能，配电可靠性，电能利用率等因素，使配电柜的设计节约电能。所以我们可以选择在主配电柜及配电板上安装EP装置，则就能使不管是外部干扰引起的还是相互干扰引起的谐波在浪涌电压进入设备之前就将其消除并吸收掉，从而达到真正意义上的提高了能源质量，保护了设备，并明显地提高了设备的运行效率。

我们在本次论文中着重讨论谐波的测量和治理方面的内容，以便认清谐波等对设备运行带来的影响，在配电柜中安装消除，减弱谐波的装置，使低压配电柜设计更加完美。

首先，论文概述了谐波的产生背景、发展现状以及发展趋势。对傅立叶变换的基本理论、基本形式以及实际应用中应注意的问题进行了详细的阐述，对传统的基于加窗DFT的谐波检测方法的误差原因及减少误差的方法进行了分析，并介绍了各种不同的余弦窗函数，进而简要分析了几种常见的频谱校正方法. 通过仿真实例，证明在选取合适的时间窗长度、采样点数以及相应的窗函数时，算法可以比较精确地测量出各次谐波及间谐波的各项参数。

关键词：电网谐波；FFT；加窗插值；MATLAB仿真

Abstract

We are in the low-voltage distribution cabinet design, it must take into account the safety performance, power distribution reliability, power utilization and other factors, so that the design of power distribution cabinet to save energy. Therefore, we can choose in the main distribution cabinets and distribution boards installed EP device, then will be able to make, whether caused by external interference or mutual interference caused by harmonics and surge voltage to enter the equipment and eliminate it before it is absorbed.

we in this paper focused on measurement and harmonic content of governance in order to get a clear understanding of harmonic operation of equipment, such as the impact of the installation in distribution cabinets eliminated, reduced harmonic device, so that low-voltage design a more perfect distribution cabinets.

First of all, the paper provides an overview of the harmonic background and current development trends. Fourier transform of the basic theory, practical application of the basic form and should be paid attention to the issues in detail, the traditional windowed DFT-based harmonic detection of the error causes and ways to reduce the error analysis, and introduced a variety of cosine window function, and a brief analysis of the spectrum of several common methods of correction. The simulation examples show that the time window to select the appropriate length of sampling points and the corresponding window function, the algorithm can be accurately compared to measure the harmonics and the parameters of inter-harmonic

Keywords：Harmonic; FFT; windowed interpolation; MATLAB simulation

目录

摘要. ……………………………………………………………………………………………............ I

1 绪论. ………………………………………………………………………………………............1

1.1 研究背景. ………………………………………………………………………………………1

1.2 谐波研究的重要性和必要性. ………………………………………………………….............3

1.3 谐波问题的划分和研究. ……………………………………………………………….............4

1.4 本论文的主要工作. …………………………………………………………………….............5

2 谐波的频谱分析理论基础. ……………………………………………………………............6

2.1 谐波的概念及特征. ……………………………………………………………........................6

2.2 谐波测量. 8

2.3 谐波分析算法的基本理论依据. ……………………………………………………….............9

2.4 DFT离散频谱误差分析. …………………………………………………………….....,,,,,,,,,,,14

2.4.1 泄漏效应. ……………………………………………………………........................14

2.5 加窗插值傅里叶变换谐波检测算法. . ……………………………………………………...18

3 基于频谱校正的谐波及间谐波检测算法……………………………………………....23

3.1 谐波及间谐波测量的频谱校正算法. ……………………………………………….............23

4 谐波的插值算法仿真…………………………………………………………….......................27

4.1 窗函数特征. …………………………………………………………………………………...27

4.2 算法修正公式的推. …………………………………………………………………………...27

4.3 MATLAB 算法的实现……………………………………………………………………............29

5 总结………………………………………………………………………………………………...36

致谢……………………………………………………………………………………………………..37

参考文献…………………………………………………………………………………….................38

附录……………………………………………………………………………………………………..39