感应电动机直接转矩控制系统的模型参考自适应辨识

Model Reference Adaptive Control of Induction Motor Based on Direct Torque Control

针对直接转矩控制的感应电动机调速系统,由于电机参数变化引起的低速特性不稳定问题,采用模型参考自适应辨识的方法,推导了一种基于感应电动机直接转矩控制系统的定子磁链自适应辨识方法。根据磁链的辨识值计算出电磁转矩;并讨论了感应电动机部分参数变化时引起磁链变化导致的转速动态变化;最后给出了在MATLAT/SIMULINK环境下的仿真结果。证明所提出方案可以较好地解决直接转矩控制的调速系统在低速范围内的静差问题。

Due to the variation of motor parameters with time in a system of induction motor based on direct torque control,a model reference adaptive system(MRAS) is produced. This system is used to identify stator flux, by which the electromagnetic torque can be calculated. Rotor speed is discussed under the condition that the parameters of induction motor are partially changed. Then simulation results indicate the validity of this method.