Design Of Automatic Excitation Control Device For Synchronous Generator

As the producers of electric power, the control of synchronous generator excitation system trend to be an important method to guarantee stability of power grid voltage and safety of power system operation. PID control was widely used in excitation control of synchronous generator, however, coefficients of proportion, integral and differential need to be constantly revised in conventional PID control, it was not easy to take it into practical application.Although fuzzy PID control could timely adjust PID parameters, but it was difficult to set the Initial value of variable field quantification factor and scale factor. Once the initial value was not appropriate, performance of control system would be greatly reduced. To solve this problem, a kind of variable universe fuzzy PID control method was put forward based on fuzzy PID control. Unsatisfactory control performance caused by unreasonable control set and inappropriate controller parameter selection could be effectively improved through this variable universe fuzzy PID control method.In this paper, the transfer function of each link of the generator excitation control system was derived based on the principle of synchronous generator excitation control. According to the transfer function model, the synchronous generator excitation controller was designed based on the conventional PID control, fuzzy control, fuzzy PID control and variable universe fuzzy PID control method. On the basis of the above four kinds of controller design principle,using the MATLAB/Simulink to set up simulation models, simulated experiments and compared its control performance. Finally, contrapose the existing synchronous generator, the experimental platform for synchronous generator automatic excitation control device was designed and built in the laboratory, selecting TMS320F2812-DSP as the control core.As the experimental results indicated, the control effect of the synchronous generator excitation controller with variable universe fuzzy PID was optimal among the four kinds of controllers above. The various modules of the excitation device experimental platform based on this control method, in the laboratory debugging process, can achieve the design function,and have a high precision, meet the experimental expectations. Using DSP as the control core of the synchronous generator excitation control device, have a simple hardware structure, easy software development, convenient maintenance, high cost performance and good reliability,and many other advantages. Therefore, it had very high value of popularization and application.