Fault-tolerant control of Y-connected three-phase induction motor drives without speed measurement

Abstract Fault-Tolerant Control (FTC) in adjustable speed drives under open-circuit faults has been broadly investigated in the literature. Nevertheless, studies in this area have been normally focused on sensored machine drives. This research focuses on the FTC approach for Y-connected Three-Phase Induction Motor (TPIM) drives without speed measurement. An Extended Kalman Filter (EKF) and a Rotor Field Oriented Control (RFOC) system are developed in order to control sensorless speed controlled Y-connected TPIM during both healthy and Single Phase Open-Circuit Fault (SPOCF) conditions. Unlike the conventional sensorless control system, the proposed drive system can be used for the sensorless speed controlled Y-connected TPIM during both normal and SPOCF conditions. The performances of the proposed FTC scheme are implemented on a DSP/TMS320F28335 controller board for a 0.75 kW Y-connected TPIM drive system. Different experimental results are shown to verify the effectiveness and possibility of the introduced technique.

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