基于PID控制的同步发电机励磁控制优化

Optimization of Synchronous Generator Excitation Control Based on PID Control

针对同步发电机励磁控制过程中超调量较大和实时性不强的特点,设计了PID励磁控制器,并通过优化PID参数来改善控制性能。首先,对于同步励磁发电机的励磁控制系统每个单元进行建模,接着对加入PID控制之后的励磁控制系统进行设计,每个单元都近似用传递函数来表示,根据PID参数整定原则,采取多次实验的方法寻找PID最优参数,在相同输入条件下对所设计的励磁控制器以及无PID控制的励磁控制系统进行了仿真分析。结果表明,励磁系统中PID控制的增加有利于提高控制系统的响应速度以及稳定性,缩短了系统达到稳定的时间,使励磁控制系统得到优化。

The PID excitation controller is designed to improve the control performance by optimizing the PID parameters in response to the characteristics of large overshoot and poor real-time performance in the excita-tion control of synchronous generators.Firstly,each unit of the excitation control system of the synchronous excitation generator is modeled,and then the excitation control system is designed after adding the PID control,and each unit is approximated by the transfer function.The simulation analysis is carried out for the designed excitation controller and the excitation system without PID control under the same input conditions.The re-sults show that the increase of PID control in the excitation system helps to improve the response speed and stability of the control system,shorten the time to reach stability,and optimize the excitation control system.