基于改进型LOEC的同步发电机扰动下的最优励磁控制系统

Optimal Excitation Control System of Synchronous Generator in Disturbance Based on Improved LOEC

LOEC考虑了电力系统多个控制目标的综合,并采用最优化设计,因而在平衡点附近具有较好的动态性能和适应性,但当扰动过大时,系统性能将变差,同时控制缺少对端电压的控制。提出了具有宽适应范围的励磁控制系统的最优励磁控制器。设计方法对变量的选择进行了改变,以转速偏差微分代替了常用最优励磁控制系统的电磁功率偏差,并增加对端电压的控制。改进后的励磁控制系统适应性得到提高。仿真计算结果表明,改进的励磁控制器具有调节范围宽,抗扰动性强的特点。

As LOEC （linear optimal excitation control）takes the integration of multiple of control targets of the power system and adopts an optimal design,it has good dynamic performance and adaptability in the vicinity of the equilibrium point.In case of severe disturbance,however,the system performance will be deteriorated and there is little control over the terminal voltage.This paper presents an optimal excitation controller of a wide range of adaptation for the excitation control system.Selection of variables is changed in the design method in that excitation power deviation in normal optimal excitation control system is replaced by speed deviation differentiation,and control of terminal voltage is added.The improved excitation control system has better adaptability.The simulation results show that the improved excitation controller is characteristic of a wide range of regulation and high resistance of disturbance.