Özet:

Direct Torque Control (DTC) of induction motor fed by a Multi-Level Inverter (MLI) has better dynamic performance. MLIs reduce switching device stress and allow devices with low voltage ratings to be used in medium and high voltage drives with high dc link voltage. The MLI system based on dual inverters has gained prominence since each inverter operates as a two-level inverter. This work implements an improvised loss analysis for a DTC control based three level dual inverter fed Open End Winding Induction Motor (OEWIM) drive. The conversion efficiency of an inverter is measured by switching and conduction losses. High junction temperatures and, as a result, device failure is also caused by these losses. The lower the switching and conduction losses lower the conversion efficiency. As a result, it is vital to quantify these losses in order to ensure the safe operation of the switching devices. These losses are mostly determined by the sort of Pulse Width Modulation (PWM) method utilized to generate the pulse pattern. Comparative loss analysis is studied for Decoupled and Alternate Inverter Switching (AIS) based Space Vector PWM (SVPWM) and Discontinuous PWM (DPWM) schemes as a function of modulation index. Therefore, a specific PWM scheme can be chosen for safe operation of the switching device is concerned.<

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