多机系统暂态定稿正 - 图文

多机系统暂态稳定性仿真

学 生： 学 号： 专 业： 班 级： 指导教师：

摘 要

经济的发展和技术的进步使得传统电力系统沿着由区域供电向大规模电力系统互联的方向发展，这一发展趋势在带来巨大经济效益的同时，也给电力系统的暂态稳定性带来了严重的挑战。

本文主要包括以下几方面的内容：

首先，系统地回顾和总结了国内外有关直接法的发展状况。结合单机无穷大系统介绍了直接法暂态稳定分析的全过程：暂态能量函数的定义及计算，临界能量确定。将直接法和等面积准则稳定判别比较，说明了二者间的一致性；然后，提出了一些提高电力系统暂态稳定的措施；最后，运用Matlab电力系统仿真模块集SimpowerSystems构建了Simulink模型，通过在系统中设置大扰动事件并进行时域仿真，对故障切除时间、电动机惯性时间常数对暂态电压稳定性的影响进行了仿真分析，表明了该模型能较准确直观地考察暂态过程中电力系统的动态特性。

关键词：暂态稳定；直接法；等面积准则；暂态稳定仿真；故障分析

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ABSTRACT

With the development of economy and the advancement of the technology, the tradition power system is experiencing a process along the way from regional power supply to the large-scale connected power system. This trend brings a great economic benefit; while at the same time, a serious challenge to the transient stability of the power systems.

The main work of this thesis is as follows:

At first, the thesis systematically reviews and summarizes the development state of the direct method inside and outside the country. Combines with single machine-infinite system, this thesis presents the process of transient-stable analysis by using direct method: the definition of transient energetic function and its calculation, how to fixes the critical energy requirement. The thesis compares the direct method with equal-area criterion and explicates their uniformity; And then, it has been taken some to improve measures of power system transient stability; Finally, Matlab SimPowerSystems are used to build up simulink models. By setting large disturbances and time domain simulation; The paper examine the influences of fault clearing time, motor’s inertia constant on transient voltage stability of system. The result shows that the dynamic behavior of power system during transient processes can be observed quite accurately and directly.

Key words：Transient stability; Direct method; Equal-area criterion; Transient stability simulation; Fault analysis

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