基于模型参考自适应辨识的直接转矩控制研究

A Direct Torque Control System Based on MRAC

针对在直接转矩控制系统中参数变化引起的电机特性不稳定问题,提出了一种基于模型参考自适应的定子磁链和转速的辨识方法,并将其应用在无速度传感器的直接转矩控制系统中.仿真结果表明:该方法有效地减小了定子电阻变化对系统特性的影响,并将由于转子常数变化引起的转速辨识误差限制在很小的范围内,从而提高了系统稳定性.

Due to the variation of motor parameters with time in a DTC system, a method for identifying stator flux and rotor speed based on MRAC is proposed and is introduced into a sensorless DTC system. The results of simulation show that this method can effectively reduce the influence of variation of stator resistance on motor performance and limit to a very small range the identification error of rotor speed, which is caused by the variation of rotor parameters, thus improving greatly the stability of the system.