PMSM Sensorless Control Based on Improved SMO and Variable Parameter LTD
In order to solve the problems of large buffeting and slow response in the non-inductive PMSM control system based on the sliding mode observer,a variable parameter linear tracking differential is intro-duced in front of the speed loop PI controller to realize the smooth transition from I/F to the speed-current double closed-loop control mode.sigmoid function is used to replace sign function to eliminate the higher harmonics caused by the switch of sign function to the equivalent back electromotive force.According to the relation between back electromotive force and motor speed,the adaptive sliding mode gain is used to improve the system response speed,and the stability of the improved algorithm is analyzed by Lyapunov stability criterion.The control algorithm is verified on the simulation platform and PMSM control system,and it is shown that the proposed improved sensorless control strategy has good effect on suppressing chatte-ring and improving the response speed of the system.
synovial observervariable parameter tracking differentiatorI/F startingsigmoid functiona-daptive synovial gain
NETL
NSTL
万方数据
