An adaptive fuzzy PID controller based on variable universe is applied to the excitation system of synchronous generator. Its structure design and factor selection are explained and its control law is given.The terminal voltage and the voltage differential are used as its inputs and the proportional,integral,differential coefficients are adjusted in real time by fuzzy treatment. The concept of variable universe is adopted to improve the parameter adjustment accuracy by selecting suitable control-expansion factor to adjust the control domain in real time. Simulation with Matlab/Simulink shows that the designed adaptive fuzzy PID controller based on variable universe has faster response,shorter adjustment time and higher stability accuracy than the traditional PID controller and fuzzy PID controller for excitation system.%将变论域自适应模糊PID控制器应用于同步发电机的励磁调节与控制中.论述了控制器的结构设计、伸缩因子的选择方法,给出了具体的控制算法.通过采集机端电压以及电压的偏差作为控制器输入,然后通过模糊处理,对比例、积分、微分系数进行实时调整,由于传统的模糊PID励磁控制器对这3个参数调节精度不高,借鉴变论域思想,通过选择合适的伸缩因子,对控制论域进行实时调整.Mtalab/Simulink仿真结果表明所设计的变论域自适应模糊控制算法较传统的PID励磁控制算法和模糊PID励磁控制算法具有响应速度快、调整时间短、稳定精度高的优势.
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