Research And Simulation On The Self And Shunt Excitation System Of Synchronous Generator

With the developing of the long-distance system foundation of the high voltage power web and the huge electric generating units used in power system, 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.Two aspects are embodied in the development of Excitation system for generator, which includes excitation way and excitation controller. lots of data point out that it is the trend to use self and shunt excitation system on large and medium generator. 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. On the other hand, with the development of control theory, the control ways of excitation system are constantly improved, which acquires plentiful and substantial fruits in this fields. 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, which could realize numerical simulation of power system. 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 two types of excitationcontroller (AVR+PSS excitation controller and liner optimized excitation controller), which have designed in the third chapter. The result indicates that liner optimal excitation controller has more preferable control performance and that AVR+PSS excitation controller has well dynamic performance, too.