基于二阶滑模的MRAS型感应电机转速辨识  

Second-order Sliding Mode Based MRAS Speed Observer for Induction Machine

作　　者：杨淑英[1] 徐静[1] 郭磊磊[1] 张兴[1] 

机构地区：[1]合肥工业大学,安徽合肥230009

出　　处：《电力电子技术》2016年第3期94-97,共4页Power Electronics

摘　　要：针对感应电机无传感器控制,提出了一种基于二阶滑模与模型参考自适应系统(MRAS)相结合的转速辨识方法。将采用Super-Twisting二阶滑模理论构造的滑模观测器作为MRAS参考模型对所构造中间变量进行观测,将磁链的电流模型改造为该中间变量的可调模型,且其可调量为转速变量,进而构造出MRAS,实现对转速的闭环观测。所构造的MRAS具有低通滤波特性,能有效克服系统中电流谐波的影响,更好地提高了系统性能。仿真和实验结果验证了该方案的可行性和有效性。A speed observer for sensorless control to induction machine is presented.The observer is constructed by combining a second-order sliding mode observer with a design on model reference adaptive system（MRAS）.In the MRAS, the sliding mode observer designed with the Super-Twisting algorithm is used as the reference model for the defined variable, while the adaptive model on the rotor speed comes from the current model of the flux.By means of the MRAS design, the rotor speed is observed.Meanwhile, since the MRAS is constructed directly on the defined variable, the pure integrator for flux calculation is avoided thoroughly, benefiting implementation of the observer.In addition, the constructed MRAS possesses the filtering property of low-pass filter, and consequently it＇ s resistant to the current harmonics resulting from non-idealities in the system,allowing for improved stability and accuracy.Simulation and experi- mental results verify the feasibility and effectiveness of the scheme.

关 键 词：感应电机 二阶滑模 模型参考自适应系统 无传感器控制 

分 类 号：TM3[电气工程—电机]