电力系统稳定器毕业设计.doc

摘 要 随着国民经济的发展，工业化水平不断提高，对电能的需求量不断增大，质量要求也不断提高，这就促使现代电力系统发展成为一个电压等级高、覆盖面积大、系统容量及单机容量都很大的电力系统。随着电网规模的扩大，低频振荡的发生也越来越多。低频振荡影响电力系统稳定性，电力系统失去稳定后，发电机不能正常发电，并要引起系统运行参数的巨大变化，因此保持电力系统稳定性成为人们非常关心的问题之一。 PSS(电力系统稳定器)是目前己经被证实的最有效的阻尼低频振荡的手段，在世界各国都得到了广泛应用。本文详细的分析了电力系统稳定器抑制低频振荡的原理，选用为输入信号，研究了电力系统稳定器参数的整定方法，计算状态矩阵，并利用李雅普诺夫小信号分析法，判断系统的稳定性。最后用MATLAB仿真软件针对单机无穷大系统的状态方程进行仿真，证实了电力系统稳定器能有效地抑制低频振荡，提高电力系统稳定性。 关键词：电力系统稳定器，低频振荡，原理， MATLABABSTRACT With the development of national economy and the improvement of industrialization level, the demand for electricity is growing and requirements for quality is improving, which makes the modern power system become a system with high-voltage, large coverage, large system volume and large single-machine capacity .As the enlargement of network scale, low frequency oscillations occur more and more often. Low frequency oscillations influence power system stability. After the loss of stability of power systems, generators can not be normal for power generation, causing great changes in operating parameters, so to maintain power system stability is becoming one of the most important issues that people are very concerned about. PSS(Power System Stabilizer) has been proved the most effective means to damp Low Frequency Oscillation ,and it is widely used all over the world. This paper analyses the principle of the power system stabilizer damping low frequency oscillations, selects as the input signal, studies the setting method of parameters of power system stabilizer, calculates the state matrix, and uses the Lyapunov method to determine the stability of the system. Finally, with the help of MATLAB simulation software it simulates the state equations of single machine infinite bus system, confirming that the power system stabilizer can effectively damp low frequency oscillations and improve stability of power system. KEY WORDS: PSS, low-frequency oscillation, principle, MATLAB目 录 第1章 绪论 1 1.1 本课题研究意义 1 1.2电力系统稳定性分类 1 1.3 PSS应用现状 2 1.4本文的工作 3 第2章 低频振荡