基于无功功率模型参考自适应的速度估算研究

Model Reference Adaptive Controller-Based Reactive Power for Speed Estimation

对基于异步电动机矢量控制的无功功率模型参考自适应控制器(MRAC)进行了详细的研究,论文以电动机的无功功率为模型进行电动机的速度估计,消除了定子电阻变化的影响,并且不含微积分项,提高了转速估算的精确性,增强了控制系统的动态性能和稳定性.分别对异步电动机的加载运行,阶跃响应和斜坡响应进行了仿真分析,结果验证基于无功功率MRAC的异步电动机矢量控制系统在低速段估算转速波形较为理想,估算跟随性能良好,过零点满足控制性能的要求,具有良好的收敛性和稳定性.

In this paper,a detailed study on the Model Reference Adaptive Controller（MRAC） utilizing the reactive power for the vector control of motor drive is presented.The model of speed estimation on the MRAC based reactive power is building.It eliminates the effect of the stator resistance＇ s change,and is free of calculus items,and improves the accuracy of speed estimation,dynamic performance and stability enhancement of the control system.That has one simulation analysis on the loading,step response and ramp response of the motor.Simulation results have been presented to confirm that Vector Controlled Induction Motor based MRAC utilizing the reactive power has good convergence and stability.The results reveal that the estimated speed follows the actual with good accuracy,and has satisfactory performance around zero crossing.