Modulated Direct Torque Control Applied to Induction Motor Drive Systems Operating Under Single-Phase Open-Circuit Fault

Abstract

This paper discusses Modulated Direct-Torque-Control (DTC)-based fault-tolerance strategies applied to three fault-tolerant induction motor drive systems when they operate under single-phase open-circuit fault. Despite the fact that these drive systems have already been discussed in the literature, the reported papers always make use of either Field-Oriented-Control (FOC)- or Switching- Table-Direct- Torque-Control (ST-DTC)-based fault compensation strategies. In this way, performed simulations show that Modulated DTC provides proper fault-tolerant performance for all studied configu-rations. Also, a comparison between ST-DTC and Modu-lated DTC for all discussed drives systems is performed, showing that Modulated DTC provides better dynamic response when the systems migrate from healthy to post-fault operation, reaching lower peak current values during transient-state operation.