The Study On Nonlinear Controller With Adaptive Torque In Asynchronous Motor System

In this dissertation, a few aspects with close relation to the AC drive system, especially the control strategies of the asynchronous motor system are firstly summarized in detail. Subsequently, a part of nonlinear control theories and the application of nonlinear differential geometric control in the asynchronous motor system are introduced and analyzed. In order to improve the robustness of the system, a reduced-order observer and an adaptive estimator are designed, which are used to observe the disturbance, variation of the load torque and estimate the rotor resistance respectively. The results are used to modify the nonlinear state-feedback control law online to ensure the decoupling of the system. The simplex algorithm is used to search for the optimal parameter of the rotate speed subsystem P1 regulator, which improved the adaptive control of the torque (speed), consequently the high performance control of the asynchronous motor system is realized. Finally, using the MATLAB5.3 to simulate the adaptive nonlinear control strategy in the asynchronous motor system, the simulation results are presented to verify the effectiveness of the proposed method.