毕业论文 电力参数计算方法的研究与应用.doc

电力参数计算方法的研究与应用 摘要 随着电力系统的快速发展，电力网容量不断增大，结构日趋复杂，电力系统中实时监控、调度的自动化就显得十分重要，而数据采集又是实现自动化的重要环节，尤其是如何准确、快速地采集系统中的各个模拟电量，一直是电力工作者关注的热点。交流采样实时性好、相位失真小、投资少、便于维护，因此越来越受到人们的重视。特别是随着计算机和集成电路技术的发展，交流采样原有的困难如算法复杂、提高精度难、对A/D的速度要求高等已逐步得到克服，所以它呈现出取代直流采样的趋势。为此，本文介绍电力系统中常用的交流采样算法，如：均方根算法，递推最小二乘法，全周波傅里叶算法等等，并分析其特点，以便正确选择其使用场合。并且对FFT算法，小波变换以及近年才引入交流采样算法领域的BP神经网络算法进行较详细的描述和仿真实现。 关键词：采样算法；FFT；小波变换；BP神经网络 Electrical Power System Computational Method Research and Application Abstract With the rapid development of electric power system, power grid capacity is continuously increasing, and structure is complicated, electric power system in real-time monitoring, dispatching automation becomes very important, and a data acquisition and automation of the important link, especially how to accurately and rapidly acquisition system simulation of all power, has been the focus of electric power workers. Ac sample of good real-time performance, phase distortion is small, less investment, easy to maintain, accordingly more and more attention by people. Especially along with the computer and integrated circuit technology development, the ac sample original difficult as complex algorithm and improve precision difficult, the speed of the A/D high demand has gradually be overcome, so it presents to replace the trend of the sampling dc. Therefore, this paper introduces the power system commonly used in ac sample algorithm such as root mean square algorithm, recursive least square method, all the ZhouBoFu leaves algorithm and so on, and analyzes its characteristics, to make the right choice to use the occasion. And in FFT algorithm, wavelet transform and in recent years was introduced into exchanges in the field of sampling algorithms BP neural network algorithm in detail description and simulation. Keywords: Sampling algorithms; FFT; Wavelet transform; The BP neural network based  目 录 摘要 I Abstract II 1前 言 1 2 国内外电力参数算法现状 2 2.1直流采样算法 2 2.2交流采样的算法 2 2.2.1正弦函数模型算法 3 2.2.1.1 最大值算法 3 2.2.1.2 单点算法 3 2.2.1.3 半周期积