Detection and Isolation of Speed-, DC-Link Voltage-, and Current-Sensor Faults Based on an Adaptive Observer in Induction-Motor Drives

A sensor fault detection and isolation unit is considered for induction-motor drives based on an adaptive observer with rotor-resistance estimation. Generally, closed-loop induction-motor drives with voltage-source inverters use a speed or position, a dc-link voltage, and two or three phase-current...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2011-05, Vol.58 (5), p.1662-1672
Main Authors: Najafabadi, T A, Salmasi, F R, Jabehdar-Maralani, P
Format: Article
Language:English
Subjects:
AC motors
adaptive observers
current measurement
Decision making
Electric potential
Failure
Fault detection
Fault diagnosis
Fault tolerance
Fault tolerant systems
Faults
Induction motor drives
Inverters
Lyapunov methods
Observers
parameter estimation
Phase current
Phase detection
Phase estimation
programmable logic devices
Rotors
Sensors
Studies
Voltage
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Summary:A sensor fault detection and isolation unit is considered for induction-motor drives based on an adaptive observer with rotor-resistance estimation. Generally, closed-loop induction-motor drives with voltage-source inverters use a speed or position, a dc-link voltage, and two or three phase-current sensors. In the proposed fault-detection and isolation unit, the estimated phase currents and rotor resistance are sent to a decision-making unit, which identifies the faulty sensor type based on a deterministic rule base. In the case of a current-sensor failure, it also detects the phase with erroneous sensor output. It is shown that, unlike the other proposed model-based fault-tolerant systems, using a bank of observers is not necessary, and only one current observer with rotor-resistance estimation is sufficient for isolation of all sensors' faults. The accuracy of the proposed approach is analytically proved. Furthermore, extensive simulation and experimental tests verify the effectiveness of the proposed method at different operating conditions.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2010.2055775