同步发电机可拓励磁控制器

Extension excitation controller of synchronous generator

为了克服传统励磁控制方法的缺点,依据可拓学理论,设计了同步发电机励磁控制器。控制器以参考电压与发电机机端电压的偏差及其微分作为特征量,根据电力系统的实际情况确定特征量的经典域和可拓域,经过关联度计算、测度模式识别,确定所采用的控制策略。应用MATLAB/Simulink软件建立了基于同步发电机三阶非线性数学描述的单机无穷大电力系统仿真模型,可拓控制器用MATLAB之S函数编程实现。与常规PID励磁控制器的仿真比较结果,验证了可拓励磁控制器对于改善电力系统小扰动稳定性和大扰动稳定性的有效性。

The excitation controller of synchronous generator is designed based on the extenics theory in order to overcome the shortcomings of generic control methods. The error of reference voltage and generatot＇s voltage and its derivative are chosen as controller＇s characteristic variables, and classical-universe and extension-universe are obtained according to actual power system. Then the correlative value is calculated, the estimation mode is identified and the control strategy is determined. The three-order simulation model of a single-machine infinite-bus system is founded considering nonlinear characteristic of synchronous generator and a MATLAB S-function procedure is written to realize extension control strategy. The simulation results indicate that the extension excitation controller can improve power system stability for both a small signal and a big disturbance compared to conventional PID（prportional-integral-derivative） controller.