基于继电自整定的模糊PI永磁同步电机速度控制器

由于常规PI控制器参数整定困难,且对永磁同步电机非线性补偿有限.针对永磁同步电机的特点,提出了基于模糊决策和继电自整定的模糊PI控制方法.先利用分段继电自整定、Z-N公式和修正计算,离线得到不同给定速度和负载转矩下系统的PI参数,再对系统当前给定速度和负载转矩进行模糊化处理,根据模糊规则表推理得到当前PI参数.仿真表明,该方法对系统不同工作状况具有良好的适应性,性能优于单个工作状态整定得到的常规PI控制器.

Fuzzy-PI Velocity Controller of Permanent Magnet Synchronous Motor Based on Relay Self-tuning

The conventional PI controller not only is difficult to obtain its parameters but also has limited compensation to the non-linear characteristic of PMSM.Considering the characteristics of PMSM,a fuzzy-PI control method based on the fuzzy decision and relay self-tuning was proposed.First,employed the method of self-tuning based on the relay feedback,Z-N formula and correction calculation,obtained offline parameters of PI controller under several cases of different given velocities and load torques.Then carried out fuzzification of the current given speed and load torque,gained online the parameters for the current PI controller through fuzzy reasoning based on the fuzzy rule table.The simulation indicates that this method has good adaptation to various working cases of the PMSM system,the performance of the fuzzy-PI controller surpasses that of the conventional PI controller which parameters are obtained by relay self-tuning in the single working state.