基于新型等效模糊滑模观测器和改进软件锁相环的永磁同步电机矢量控制

摘要

In order to obtain the motor speed and rotor position accurately,a new control method based on the new equivalent fuzzy sliding mode variable structure and improved SPLL was proposed.Based on the traditional equivalent sliding mode variable structure,through changing the switching function,making the switcher fuzzication,reduced the output' s vibration of the observer,eliminating the low pass filter and the compensation of the rotor angle;Due to the motor's own excitation,magnetic circuit and other reasons,harmonics would be produced.And after the dq coordinate transformation and PI regulation,its output was no longer a frequency deviation.Therefore,it was necessary to use the improved SPLL to get the higher precision of the motor speed.The simulation structure showed that this method had the advantages of fast response,small overshoot,strong robustness to external load disturbance and parameter variation.%为准确获取电机转速和转子位置,提出了一种基于新型等效模糊滑模观测器和改进型软件锁相环(SPLL)相结合的控制方法.在传统的等效滑模控制的基础上,通过改变切换函数和将切换增益模糊化,降低了观测器输出振动;同时,改进了等效滑模控制系统,省去了低通滤波器和转子角度补偿环节,简化了系统结构.此外,采用改进型SPLL,克服了电机因自身励磁、磁路等原因产生谐波,导致经dq变换和PI作用后其输出量不再有频率偏差的问题,从而得到更高精度的电机转速.最后,通过仿真验证了该方法较传统方法对电机控制具有使系统响应速度更快、超调更小、对外部的负载扰动和参数鲁棒性更强等优点.