基于labview电力谐波分析.doc

摘 要 本文提出了如何利用计算机来分析电力系统中存在的谐波的方法。电力系统中的谐波危害十分严重，能使电能的利用效率降低，烧毁设备，对通信系统也会产生严重的干扰，因此准确分析电力系统中的谐波信号变的十分必要。 本文论述了采用LABVIEW软件分析电力系统中谐波信号的方法，实时显示谐波的时域信号，频域信号，经过滤波后的时域信号及频域信号。 本文重点研究信号傅里叶变换；各种滤波器的性能，及对谐波信号的影响。通过如何使用计算机来实现快速傅里叶变换和设计IIR及FIR滤波器来加深对信号分析过程的理解。 本文主要利用LABVIEW软件对信号进行时域及频域分析，用C语言来实现信号的傅里叶变换，和滤波器的设计，并通过matlab来验证C语言实现的傅里叶变换和滤波器的结果。 关键词：电力谐波；快速傅里叶； 滤波器设计 ABSTRACT This paper puts forward how to use computer to analysis the harmonic existing in the electric power system The power system harmonic wave is severe, can make the electric energy efficiency in the use of equipment to reduce, burned, communication system can also have serious interference, so accurate analysis of the power system harmonic signal is very necessary. This paper discusses the method how to analysis the harmonic signal existing in the power system ,display the time domain signal ,the frequency domain signal and the ones being processed by filter using the labview software. This paper focuses on Fourier transform, the performance of some kinds of filters and the influence on the harmonic signal. Through how to use computer to realize fast Fourier transform and design IIR and FIR filters to deepen the understanding of signal analysis process. This paper mainly uses the labview software to analysis signal in time domain and frequence domain. Using the C language to design the Fourier transform and the filters. Through the matlab to verify the results of the Fourier transform and the filters designed by C language. Keywords: Power harmonic； Fast Fourier transform； Filter designing 目 录 1 绪论 1 1.1 选题意义 1 1.2 电力谐波及其危害 2 1.3 研究内容 2 2 快速傅里叶变换及实现 4 2.1 傅里叶变换的推导 4 2.2 序列的傅里叶变换 6 2.2.1信号的理想抽样 6 2.2.2 序列傅里叶变换公式推导 8 2.3 离散傅里叶变换 9 2.4 快速傅里叶算法及实现 10 3 滤波器设计及实现 14 3.1 IIR 滤波器的设计及MATLAB仿真 14 3.2 FIR 滤波器的设计及MATLAB仿真 19 4 LABVIEW谐波分析软件 22 4.1 系统总图 22 4.2 信号生成模块 22 4.3 滤波模块 25 4.3.1 IIR Filter模块 26 4.3.2 FIR Filter模块 27 4.4 Fourier 变换模块 30 4.5 系统调试 31 总结 32 致 谢 33 参考文献 34 附 录 35 1 绪论 1.1 选题意义 随着科学技术的发展,各种电子产品在电力