区域互联的现代大电网下电力系统运行稳定性正面临着严峻挑战,需要研究更加可靠、快速的电力系统稳定性分析方法。李雅普诺夫的稳定性理论是作为分析系统稳定性普遍都适用的理论,所以它也可用在电力系统的稳定问题的判断分析上。目前,暂态稳定分析已经广泛采用李雅普诺夫直接法,但这种方法很少用于分析小干扰稳定问题。故本文主要讨论李雅普诺夫方法在小扰动稳定问题上的具体应用,创建了小扰动稳定分析模型并分别采用特征值法和直接法两种方法对这个小扰动稳定性进行判定分析。以单机无穷大系统、WSCC3机系统为例在MATLAB软件中进行仿真分析,并对系统的动态性能进行评价。结果表明:在判断电力系统小扰动稳定性的问题上,直接法和特征值法都能做出较为可靠和准确的判定分析。82791
毕业论文关键词 电力系统 稳定性 Lyaponov稳定理论 直接法 特征值法
毕业设计说明书外文摘要
Title Power System Stability Analysis Based on the Lyapunov Method
Abstract The operation stability of power system under the regional interconnected power system is facing severe challenges, so it is needed to study more reliable and fast method of power system stability analysis。 Lyapunov stability theory is used to analyze the stability of the system, and also can be used in the stability of the power system。 At present, Lyapunov direct method has been widely used in the field of transient stability analysis, but seldom used in that of the small signal stability analysis。 In this paper, we mainly discuss application of Lyapunov method in the small signal stability problem, what’s more, we will establish a small perturbation stability analysis model and use eigenvalue method and direct method to analyze and determine a small disturbance stability。 The simulation and analysis are carried out on a single machine infinite bus system and a WSCC3 system as examples, and the limitations of the two methods are discussed。 The results show that the direct method and the characteristic value method can make a reliable and accurate decision analysis on the problem of judging the small disturbance stability of power system。
Keywords Power system Stability Lyapunov stability theory Direct method Eigenvalue method
目 次
1 引言 1
1。1 课题研究背景及意义 1
1。2 国内外研究概况 1
1。3 本课题主要研究内容 3
2 李雅普诺夫稳定性理论简介 5
2。1 李雅普诺夫稳定性理论介绍 5
2。2 线性系统稳定性分析 8
2。3 非线性系统稳定性分析 8
2。4 小结 9
3 电力系统小扰动稳定分析 10
3。1 小扰动分析的数学模型 10
3。2 特征值法分析小扰动稳定性 13
3。3 直接法分析小扰动稳定性 13
3。4 小结 16
4 基于Lyapunov方法的小扰动稳定实例分析