基于模糊协调控制策略的同步发电机励磁系统研究

摘要

Safety and stability are the basic conditions of the power system operation. Enhancing the control performance of excitation system has great significance for the safe-stable operation of both the synchronous generator and the power system. A PID+ LOEC fuzzy coordination excitation controller is designed which combines the advantages of good voltage regulation quality of PID with the good dynamic and damping quality of liner optimal excitation controller (LOEC). According to the changes of the system operating conditions, the fuzzy controller can control the output of PID and LOEC through weight coefficient coordination in order to enhance the adaptive ability. Fuzzy coordinated control is compared with PID and LOEC respectively through establishing system simulation model in Simulink. The result shows that fuzzy coordinated control has better dynamic and static performance.%安全稳定是电力系统运行的基本条件,提高励磁系统的控制性能,对同步发电机和电力系统的安全稳定运行都有着重要意义.利用PID良好的电压调节特性,并结合线性最优励磁控制器(LOEC)良好的动态和阻尼特性,建立了PID+LOEC模糊协调励磁控制器.根据系统状态的变化,模糊控制器可以通过加权系数协调控制PID和LOEC的输出,从而提高对系统状态变化的自适应能力.通过在Simulink中建立系统仿真模型,把基于模糊控制器的PID+LOEC协调控制分别和PID、LOEC做了比较,结果显示,基于模糊控制的协调控制策略,具有更好的动、静态性能.