Sensitivity Analysis of a Stator Current-based MRAS Estimator for Sensorless Induction Motor Drives
Received: 14 August 2024 | Revised: 3 September 2024 | Accepted: 8 September 2024 | Online: 23 September 2024
Corresponding author: Mohamed S. Zaky
Abstract
The sensitivity of speed estimators for parameter variations presents a significant challenge for sensorless Induction Motor (IM) drives, particularly at very low speeds. This paper examines the impact of parameter variations and the PI adaptation mechanism on the stator current-based Model Reference Adaptive System (MRAS). In contrast to the estimation of rotor flux, the MRAS method uses the observed stator current and the stator current estimate error within the adjustable IM model. The stability analysis for changes in machine parameters and PI controller gains is examined using small-signal perturbation. Additionally, a sensitivity analysis of stator and rotor resistance changes is included. A complete simulation using MATLAB/Simulink and experimental validation using a laboratory prototype based on the DSP-DS1103 are provided. The analytical, modeling, and measurement results reveal that the suggested observer responds well and provides precise speed estimation in all four quadrants of operation.
Keywords:
MRAS, speed estimation, low speed, stability analysis, rotor resistance, stator resistanceDownloads
References
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Copyright (c) 2024 Mohamed S. Zaky, Mohamed Metwaly
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