感应电机直接转矩控制系统变结构MRAS速度辨识

Variable-structure MRAS Speed Identification for Direct Torque Control of Induction Motor

基于变结构控制和自适应控制理论,提出了一种模型参考变结构(MRAS-VS)观测器,用于感应电机无速度传感器直接转矩控制系统的转速辨识。该法将变结构和模型参考自适应(MRAS)进行有机的整合,选择转子磁链电压模型和电流模型分别作为参考模型和可调模型,采用两模型输出的偏差构造了一个滑模面。理论分析和仿真结果表明,所提出的感应电机无速度传感器直接转矩控制系统的转速辨识方法具有较高的转子磁链观测准确度,因而改善了转速估计的动静态性能。

A novel strategy of variable structure model reference adaptive system （MRAS- VS） observers was proposed for the speed identification of a sensor-less direct torque controlled induction motor drive. This strategy combines MRAS with variable structure control, and selects the voltage model of rotor fluxes as the reference model and the current model of rotor fluxes as the adjustable model, and formulates a slide mode surface according the output errors of two models. Theoretical analysis and simulation results show that the proposed strategy possesses the veracity of fluxes observers and improves the dynamic and static performance of the speed estimation.