MATLAB同步发电机励磁系统的研究及仿真
毕业论文关键词： 励磁系统；自动励磁调节器；线性最优控制；电力系统稳定器；MATLAB；仿真。
Title Research and simulation on the Excitation System of Synchronous Generator
Abstract: How to keep the power system in a stable and reliable state is an essential problem. Excitation system of synchronous generator plays an important role in improving the reliability and stability of power system nowadays. One of the most efficient and economic way among those methods to improve stability of generators, which has been acknowledged generally, is to upgrade the performance of excitation device. This thesis sets forth the merit and flaw of excitation system and other concerned problems of main loop, magnetizing field loop and de-excitation loop in detail. This thesis focuses on the application of AVR+PSS excitation controller and linear optional controller. SimPower toolbox provided by MATLAB is software planet towards power system simulation. The SimPower toolbox is used in the fourth chapter of this thesis to construct single-machine infinite simulation model with excitation controller. Simulation tests were done on the model to test AVR+PSS excitation controller and liner optimized excitation controller.
Keywords : excitation system; auto voltage regulator; linear optimal control; power system stabilizer; simulation.
1 绪论2
1.1同步发电机励磁系统的主要任务2
1.2励磁控制器的发展与研究现状3
1.3课题研究的目的和意义4
1.4课题内容及要求5
2 同步发电机励磁系统主回路及起励、灭磁回路分析6
2.1主回路接线方式6
2.2励磁系统主回路参数计算6
2.3同步发电机起励10
2.4同步发电机灭磁11
3 励磁控制器的研究13
3.1 PID励磁控制器研究13
3.2 AVR+PSS励磁控制器研究17
3.3线性最优控制器研究20
4 MATLAB仿真研究23
4.1 MATLAB/Simulink/PSB简介23
4.2励磁系统数学模型24
4.3仿真研究30
4.4仿真结果分析32
5 总结34
致 谢35
参考文献36
1 绪论 所谓励磁系统，即供给同步发电机励磁电流的电源及其附属设备，它一般是由励磁功率单元和励磁调节器两个主要部分组成。励磁功率单元向同步发电机转子提供励磁电流；励磁调节器则根据输入信号和给定的调节准则控制励磁功率单元的输出。励磁系统的自动励磁调节器对提高电力系统并联机组的稳定性具有相当大的作用。尤其是现代电力系统的发展导致机组稳定极限降低的趋势，也促使励磁技术不断发展。 励磁系统是同步发电机的重要组成部分。在现代化的电力系统中，提高和维持同步发电机运行的稳定性，是保证电力系统安全、经济运行的基本条件之一。在众多改善同步发电机稳定运行的措施中，运用现代控制理沦、提高励磁系统的控制性能是公认的经济而有效的手段之一[2]。
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