Sensorless Control Method of PMSM Based on LADRC and Nonlinear Flux Observer
A new sensorless control method was proposed by combining the linear active disturbance rejec-tion control ( LADRC) algorithm and the nonlinear flux observer to overcome the shortcomings of tradi-tional strategies like back-EMF based sensorless control method,PI control algorithm and original active disturbance rejection control ( ADRC) algorithm. The method does not require rotor speed information,which avoids a series of problems caused by speed estimation errors. It solves the problems of insufficient flexibility and poor disturbance rejection ability of PI control algorithm. It also reduces the difficulties of tunings for too many parameters in ADRC. The mathematic deductions of the nonlinear flux observer and LADRC were derived,and the models for flux observer and first-order velocity LADRC were established. The nonlinear flux observer is used to observe both the rotor speed and position,and the active disturbance rejection speed regulator estimates and compensates adaptively the errors in the observed results in real time,the dynamic and static performances of the system are improved. The simulation and experimental re-sults verify the feasibility and advantages of the proposed method.
万方数据
维普
