本科毕业设计__基于傅里叶变换的电网谐波分析.doc

毕业论文（设计） 题 目： 基于傅里叶变换的电网谐波分析 系部名称： 信息工程系 专业班级： 学生姓名： 学 号： 指导教师： 教师职称： 201 年 月 日 摘 要 电力是现代社会不可缺少的重要能源。随着科技的发展电力系统中谐波的危害与影响也越来越多。本文归类并分析了现有谐波检测方法的检测精度、速度、延时和实时性,指出基于傅里叶变换的检测法既可检测谐波又可用于频谱分析。有关谐波问题的研究涉及的内容很广，包括对畸变波形的分析方法、谐波源分析、谐波测量及在谐波情况下对各种电气量的测量方法、电网谐波潮流计算、谐波补偿和抑制、谐波限制标准等。其中谐波测量是谐波问题中的一个重要分支，也是研究分析谐波问题的出发点和主要依据。由于谐波具有固有的非线性、随机性、分布性、非平稳性以及影响因素的复杂性等特征，难以对谐波进行准确测量，为此许多学者对谐波测量问题进行广泛研究，各种谐波测量方法相继出现。本文根据有关资料，对谐波测量方法进行综述。 关键字：傅里叶变换，谐波检测?，同步采样  analysis of power network based on Fourier transform Abstract Electricity is an important energy indispensable to modern society. With the development of science and technology in the power system harmonic harm and influence is also more and more. This paper classified and analyzed the existing harmonic detection method of real time and accuracy, speed, delay, pointed out that based on Fourier transform method can detect the harmonic and can be used for spectrum analysis. Studies on the problem of harmonic content is very wide, including the distortion of waveform analysis method, harmonic analysis, harmonic measurement and in the case of harmonic source for all kinds of electric parameters measurement, power grid harmonic power flow calculation, compensation and harmonic suppression, harmonic limits, etc. The harmonic measurement is an important branch of the harmonic problems, and is the starting point of the research and analysis the harmonic problem and main basis. Because the harmonic has inherent nonlinearity, randomness, distribution, nonstationarity and the complexity of the factors affecting the characteristics, hard to accurate measuring of harmonic, therefore many scholars conduct extensive research problems of harmonic measurement, harmonic measurement methods appeared. In this paper, in accordance with the relevant information on harmonic measurement methods were summarized. Key words: Fourier transform, harmo