Author(s): Mascarenhas, Manuel Maria Brás Pereira
Date: 2013
Persistent ID: http://hdl.handle.net/10362/9957
Origin: Repositório Institucional da UNL
Subject(s): Induction machine; Multi-level inverter; Neutral point clamped; Direct torque control; Space vector modulation
Dissertação para obtenção do Grau de Mestre em Engenharia Electrotécnica e de Computadores
Multi-level converters have been receiving attention in the recent years and have been proposed as the best choice in a wide variety of medium voltage applications. They enable a commutation at substantially reduced voltages and an improved harmonic spectrum without a series connection of devices, which is the main advantage of a multi-level structure. The use of multi-level inverters contributes to the performances amelioration of the induction machine control. In fact, the use of three level inverter (or multilevel inverter) associated with DTC control can contribute to more reducing harmonics and the ripple torque and to have a high level of output voltage. A variation of DTC-SVM with a three level neutral point clamped inverter is proposed and discussed in the literature. The goal of this project is to study, evaluate and compare the DTC and the proposed DTC-SVM technique when applied to induction machines through simulations. The simulations were carried out using MATLAB/ SIMULINK simulation package. Evaluation was made based on the drive performance, which includes dynamic torque and flux responses, feasibility and the complexity of the systems.
