(完整版)电力系统稳定器PSS的设计毕业设计

Abstract

With the rapid development of China's power industry, the size of the power system is increasing day by day, to further improve the voltage level, increasing installed capacity and electricity load, wind, solar and other new energy power generation share of power generation the proportion of the increase of electricity the stable operation of the system becomes more and more prominent. With the interconnection of large power grids, doubled the capacity of the power system, as well as the widespread use of fast excitation device, the problems of a large grid has been showing, Britain and other countries have been large-scale blackouts, more and more countries the problems of large power grids concern the stability of large power grids has been the focus of the experts, low-frequency oscillation is an important factor affecting grid stability, low frequency oscillation suppression will have a more mature approach as early as the 1970s, the most typical is power system stabilizer (PSS).

Power system stabilizer (PSS) is to suppress a low frequency oscillation of additional excitation control. It is the excitation voltage regulator, the introduction of axial velocity ahead of additional signals to produce a positive damping torque to overcome the primary excitation voltage regulator produced negative damping torque effect. Improving power system damping, lowing frequency oscillation problem solving is to improve power system dynamic stability of the important measures.

The topics start with theory, a detailed analysis of the synchronous generator voltage equation and flux equation and derivation of the

equations of the electromagnetic power of the synchronous generator in a simple system and synchronous generator rotor equation of motion. MATLAB model of single machine infinite bus system and on this basis to establish it as the object of study, the specific analysis of the role of the PSS on the stability of the system, and then analyzed the system with PSS and without PSS operation of the system, and finally Of the two cases were compared and analyzed the advantages and disadvantages of PSS, while the future of the power system of a higher challenge.

This paper describes the power system stabilizer's design principles and the impact on the power system, the use of the benefits of power system stabilizer. The frequency of oscillation maybe happen to power system when the system In the normal operation.It gives a great help if the power system after the addition of PSS.

Keywords ：low frequency oscillation；negative damping；power system

stabilizer

目 录

摘 要 .................................................................................................................................... I

Abstract .............................................................................................................................. III

目 录 ................................................................................................................................... V

1 绪论 .................................................................................................................................... 1

1.1 课题的意义 .............................................................................................................. 1 1.1.1 研究背景 ........................................................................................................ 1

1.1.2 国内外的研究现状........................................................................................ 2

1.2 电力系统稳定.......................................................................................................... 5 1.2.1 电力系统稳定性的分类 ............................................................................... 5

1.2.2 提高电力系统稳定的措施 ........................................................................... 7

1.2.3 励磁系统对电力系统稳定的影响 ............................................................... 9

1.3 MATLAB的简介 .................................................................................................. 10 1.4 本论文的主要工作................................................................................................ 11 2 同步发动机方程.............................................................................................................. 13

2.1 同步发动机的电压方程 ....................................................................................... 13 2.2 同步发电机的磁链方程 ....................................................................................... 15 2.3 同步发电机的电磁功率方程 ............................................................................... 19 2.3.1 隐级式发电机的电磁功率方程 ................................................................. 19

2.3.2 凸极式发电机的电磁功率方程 ................................................................. 22

2.4 同步发电机的转子运动方程 ............................................... 错误！未定义书签。 2.4.1 同步发电机的转子运动方程 ..................................... 错误！未定义书签。

2.4.2 发电机转子运动方程的研究意义 ............................................................. 23

3 电力系统稳定器基本介绍 ............................................................................................. 25

3.1 电力系统稳定器简介............................................................................................ 25 3.2 电力系统弱阻尼产生原因 ................................................................................... 26 3.3 低频振荡简介........................................................................................................ 26 3.4 电力系统稳定器抑制低频振荡原理 ................................................................... 27 3.5 本章小结 ................................................................................................................ 28 4 PSS的设计 .................................................................................................................... 29

4.1 电力系统稳定器的设计原理 ............................................................................... 29 4.1.1 PSS网络的设计PSS网络的设计 .............................................................. 30

4.1.2 汽轮机及其调节系统超前补偿网络的设计 ............................................. 31

4.2 本章小结 ................................................................................................................ 33 5 电力系统稳定器MATLAB仿真分析 .......................................................................... 34

5.1 简单电力系统的建立............................................................................................ 34 5.2 模型运行仿真分析................................................................................................ 36 5.3 PSS作用分析 ...................................................................................................... 37 5.4 本章小结 ................................................................................................................ 37 6 主要结论和展望.............................................................................................................. 38

6.1 主要结论 ................................................................................................................ 38 6.2 展望未来 ................................................................................................................ 39 参考文献 .............................................................................................................................. 40

致 谢 .................................................................................................................................... 42