Abstract
In this paper, an enhanced active fault-tolerant control (FTC) is proposed to solve a current sensor failure in the induction motor drive (IMD) using two current sensors. The proposed FTC method applies only one observer to diagnose the faults and reconfigure the control signals by the space stator current. The diagnosis function is made up of a comparison algorithm between the measured current space vector and the estimated space vector. Then, incorrect feedback stator currents are replaced by the estimated values in the reconfiguration function. The amplitude of a healthy measured current is applied to adjusted the accuracy of estimated current signals. The IMD uses the field-oriented control (FOC) technique to control the speed and torque. The effectiveness in stabilizing the IMD system when a current sensor error occurs is verified by various simulations in the Matlab-Simulink environment This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.
Highlights
Nowadays, with diverse applications in the industrial eld, induction motors (IMs) are essential equipment in the manufacturing industry
Due to the development of power electronics devices combining modern control algorithms, the induction motor drive (IMD) is almost capable of replacing the DC motor drive in industrial applications requiring high stability and safety
Unexpected sensor failures can weaken the performance of IMDs, and if not handled promptly, they can cause a collapse of the IMD system [2]
Summary
With diverse applications in the industrial eld, induction motors (IMs) are essential equipment in the manufacturing industry. In a three-phase coordinate system [a, b, c] were transformed into corresponding observers, and the estimated stator currents were calculated from these voltages. In [8], two diagnosis techniques are presented to generate the current-residuals dynamics in the coordinate systems [α, β]: the dierentialalgebraic estimation of fault-dynamics and the other method based on a combination of the Robust Integral Sign of the Error observer. We proposed an upgrading fault tolerance control against the total failure of current sensors in the IMD system, which applies two current sensors. The inputs of the FOC controller includes the stator voltages [uSα, uSβ ] calculated from switching inverter signals and DC links, the measured currents from sensors, the rotor speed. Fault diagnosis step: An error of the current sensor is diagnosed by comparing the modulus between estimated and measured stator current space vector.
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