Rotor Resistance Correction Method Of Asynchronous Motor Base On Rotor Flux Q Axis Component

At present, High-speed Rail and rail transit is in rapid development period. Traction convertor play an important role in the electric locomotives. FOC(Field oriented control) is widely used in the control of traction convertor. But FOC is sensitive to the change of rotor resistance, what researched in my paper, about correcting strategy of rotor resistance in FOC system.Firstly, some typical rotor flux observers and the advantages or disadvantages of each observer were introduced. Then analysis the asynchronous induction motor model, study the voltage, current and flux equations in different reference frame, and how to transform the equations between different frames.Rotor resistance correction method base on rotor flux q axis component rq? is simple and effective. A rotor flux q axis component rq? observer in the stator current orientation synchronous reference frame, and the improved rotor flux q axis component rq? observer with amplitude and phase compensation based on voltage model were introduced in the paper. Simulation results verify that theoretical analysis is correct and accurate field orientation correction strategy is effective.A new method of rotor flux q axis component rq? observer researched based on the steady state model of the asynchronous induction motor. Two simulation model were built in Matlab/Simulink, one of them was built with S-function to imitate and compensate the delay of the observer. experiment Results of the experiment prove the validity of the proposed method.