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摘要同步发电机作为电力系统的主要运行设备，实现了机械能到电能的转换。通过对发电机的励磁绕组提供励磁电流，产生出的直流磁场并在电枢绕组上感应出三相交流电，实现了到电能的转换。而同步发电机的运行离不开励磁系统的作用，励磁系统发挥着对发电机进行励磁控制调节的功能，其运行状况不仅影响发电机本身的运行情况，而且会对发电力系统的稳定运行产生重要影响。由于现代电力系统的不断发展，发电机组容量和电力系统的容量不断增加，除了必须进一步提高励磁系统的可靠性之外，对于励磁调节的功能有了越来越多的要求。励磁系统应能根据系统内部的变化，保证发电机输出的电能质量、并联机组间无功功率的合理分配，提高系统运行的安全性和稳定性。32081
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同步发电机励磁系统功能的实现，由励磁功率单元和励磁调节器两个部分构成。励磁功率单元向发电机的转子提供励磁电源，在发电机内部建立磁场；励磁调节器通过对输入信号的处理，调节励磁功率单元中励磁电流的输出，保证发电机运行的条件。同步发电机励磁自动控制系统是由励磁调节器、励磁功率单元和同步发电机构成的闭环反馈控制系统，通常用它来分析励磁系统的性能。
毕业论文关键词: 同步发电机 励磁系统 电力系统 励磁调节器
Abstract As the main running equipment of power system, synchronous generator has realized the conversion of mechanical energy to electrical energy,through providing excitation current for excitation winding of generator, the DC magnetic field produced induces a three-phase alternating current in the armature winding and realize the change of energy.Excitation system plays a very important role in the working of Synchronous generator,and its running conditions influence not only synchronous generator itself but also stable running of power system.For the continuous development of modern power system,the capacity of generator and electrical power system have mounted up for a long time.Apart from improving the dependability of excitation system,the demands of the function of excitation system have been stricter and stricter.The excitation system should be able to ensure the power quality of generator, and the reasonable distribution of reactive power,and stability of the system according to the change of internal system.
The realization of the function of the synchronous generator excitation system is composed of two parts which include excitation power unit and excitation regulator.Excitation power unit provides excitation power for the rotor of the generator and sets up magnetic field inside.Through the processing of the input signal,excitation regulator is in charge of regulating the output signal of excitation power unit and ensure the running condition of the generator.The automatic control system of the synchronous generator is a close-loop feedback control system composed of the excitation regulator,the excitation power unit and the synchronous generator. It is usually used to analyze the performance of the excitation system.
Key words：Synchronous generator Excitation system Power system
Excitation regulator
目 录
摘 要 I
Abstract II
1 绪 论 1
1.1 同步发电机励磁系统的任务 1
1.2 励磁系统的发展及现状 2
1.3 对励磁系统的基本要求 3
1.3.1 对励磁调节器的要求 3
1.3.2 对励磁功率单元的要求 4
1.4 课题的研究意义 4
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