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Design and Implementation of an Adaptive Sliding-Mode Observer for Sensorless Vector Controlled Induction Machine Drives

  • Zhang, Yanqing (Dept. of Electrical Engineering, Xi'an University of Technology) ;
  • Yin, Zhonggang (Dept. of Electrical Engineering, Xi'an University of Technology) ;
  • Liu, Jing (Dept. of Electrical Engineering, Xi'an University of Technology) ;
  • Tong, Xiangqian (Dept. of Electrical Engineering, Xi'an University of Technology)
  • Received : 2017.09.16
  • Accepted : 2018.01.26
  • Published : 2018.05.01

Abstract

An adaptive sliding-mode observer for speed estimation in sensorless vector controlled induction machine drives is proposed in this paper to balance the dilemma between the requirement of fast reaching transient and the chattering phenomenon reduction on the sliding-mode surface. It is well known that the sliding-mode observer (SMO) suffers from the chattering phenomenon. However, the reduction of the chattering phenomenon will lead to a slow transient process. In order to balance this dilemma, an adaptive exponential reaching law is introduced into SMO by optimizing the reaching way to the sliding-mode surface. The adaptive exponential reaching law is based on the options of an exponential term that adapts to the variations of the sliding-mode surface and system states. Moreover, the proposed sliding-mode observer considering adaptive exponential reaching law, which is called adaptive sliding-mode observer (ASMO), is capable for reducing the chattering phenomenon and decreasing the reaching time simultaneously. The stability analysis for ASMO is achieved based on Lyapunov stability theory. Simulation and experimental results both demonstrate the correctness and the effectiveness of the proposed method.

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