Novel Speed and Current Sensor FDI Schemes with an Improved AFTC for Induction Motor Drives

Mohamed Bouakoura,Nasreddine Nait-Said,Adel Belbach,Mohamed Said Nait-Said

doi:10.15598/aeee.v16i1.2573

Mohamed Bouakoura, Nasreddine Nait-Said + Show 2 more

Open Access

https://doi.org/10.15598/aeee.v16i1.2573

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Abstract

This paper focuses on speed and current sensor Faults Detection and Isolation (FDI) in an Induction Motor (IM) drive. The effect of sensors faults on the IM vector control is presented, then, new detection and isolation approaches are suggested. Speed sensor faults are detected when an error between only two points from speed data exceeds a certain threshold. An algorithm based on RMS currents is developed to detect and isolate any faulty current sensor. This requires three current sensors, each per phase. Besides, open circuit faults of inverter power switches are taken into account too. To ensure continuous functionality of the drive, we conceived an Active Fault Tolerant Controller (AFTC) with smoother reconfiguration feature. Simulations in Matlab/Simulink are carried out to show the efficiency of the suggested schemes.

Highlights

Fault Tolerant Control (FTC) is a technique implemented in many critical and high availability systems
Before we present the Faults Detection and Isolation (FDI) algorithms, we show the influence of speed and current sensor faults on the performance of the Induction Motor (IM) drive with indirect field-oriented control
The speed variation due to a sensor fault is faster than its variation due to a torque load, change in speed reference or faults in other components of the c 2018 ADVANCES IN ELECTRICAL AND ELECTRONIC ENGINEERING

Summary

Introduction

Fault Tolerant Control (FTC) is a technique implemented in many critical and high availability systems. In this paper, we investigate speed and current sensor faults in an induction motor drive. Fault tolerant techniques are divided into two types: passive FTCs and active FTCs. The first ones involve robust controllers such as H_∞ [10] and [11] and sliding mode controllers [12], [13] and [14], i.e. the faulty element remains integrated in the system where the controller absorbs its effect. This paper covers several contributions to speed and current sensor faults diagnosis and tolerance in induction motor drives. Last mentioned are effective and easy to implement To handle these faults, an improved AFTC scheme is developed with smoother reconfiguration feature at sensor fault moment.

Speed Sensor Faults Effect on IFOC

Speed Sensor Faults Detection

Faulty Current Sensor

Faulty Power Switch

Overview of the AFTC Scheme

Conclusion