电力系统机网暂态过程波形分析

WAVE ANALYSIS OF THE TRANSIENT PROCESS OF MACHINE—NETWORK IN ELECTRIC POWER SYSTEMS

本文介绍采用离散傅立叶变换(DFT)和曲线拟合进行电力系统机网暂态过程波形分析的方法。在电力系统机网暂态过程中通常都包含有直流分量和一系列衰减的、频率各异的正弦交流分量,本文介绍的方法首先利用离散傅立叶变换求取每一分量的角频率,再利用线性曲线拟合求取每一个分量的衰减常数、幅值和初相位,最后采用Hooke—Jeeves方法对所有的参数进行优化处理。与常用的谐波分析法相比,该方法具有分析精度高、适应性广的特点。

This paper presents a method which applies both discreate fourier transform (DFT) and curve fitting technique to analyze the wave of the transient process of machine-network in electric power system.Direct current component and a set of decaying alternating current components with different frequencies are usually presents in such transient processes.It applies DFT to get the angular frequency,and the linear curve fitting method to find the decay constant,the amplitude and the initial phase of each component. Hooke-Jeave method is adopted for the optimal processing for all parameters.Comparing with the convention harmonic analysis method has the superiarity of high precision and wide adaptability.