Generator excitation system

The excitation power unit provides synchronous generator rotor excitation current;While the excitation regulator according to the rule of the input signal and the adjustment of the given control excitation power unit of output.The excitation system Automatic excitation regulator To improve the stability of power system, parallel units have considerable effects.Especially the development of modern power system, reduce the unit stability limit of the trend, also prompted excitation technology development.Synchronous generator excitation system is mainly composed of power unit and regulator (device) composed of two parts.As shown in figure:

The excitation power unit is to provide dc excitation synchronous generator rotor winding current excitation source of excitation regulator is according to the requirements of control rule of the input signal and the adjustment of the given control excitation power unit output device.By the excitation regulator, excitation power unit of generator itself together and the whole system known as the excitation system control system.Is an important part of the generator excitation system, it is safe and stable operation of power system and the generator itself has a great influence.

The excitation systemThe main role

Excitation system of the main functions are: 1) according to the change of the generator load corresponding adjusting excitation current, to keep the voltage of the machine for a given value;2) control of reactive power allocation between the generator in parallel;3) improve the static stability of generator in parallel;4) improve the transient stability of generator in parallel;5) within the generator fails, drop-out, to reduce the damage degree;6) according to the operation requirements to carry on the largest generator excitation limit and the minimum excitation limit.