Phan, The Minh: Protection of the switches in a three-level inverter by using modified switching schemes for the redistribution of losses. 2016
Inhalt
- Abstract
- Zusammenfassung
- Nomenclature
- Contents
- 1 Introduction
- 1.1 Motivation
- 1.2 Objective of research work
- 1.3 Problem formulation and contribution of this work
- 1.4 Outline of thesis
- 2 Fundamentals
- 2.1 Three-level Neutral-Point-Clamped Voltage Source Inverter
- 2.2 Space vectors
- 2.3 Modulation Techniques for 3L-NPC VSI
- 2.4 Generation of switching sequence
- 2.5 Optimization of switching sequence aiming at reduction ofneutral-point voltage imbalance
- 2.6 Control schemes for induction machines
- 2.7 Estimation of losses in semiconductors devices
- 3 Modification of PWM aiming at a reduction of losses
- 3.1 Modification of PWM in range of low modulation index
- 3.2 Modification of PWM in range of high modulation index
- 3.3 Application of PWM with ALE to the other legs of the inverter
- 3.4 Limits of proposed modified PWM
- 3.5 Summary of chapter
- 4 Experimental results
- 5 Simulation of the system
- 5.1 Verification of the loss model
- 5.2 Performance of PWM in range of low modulation index
- 5.3 Performance of modified PWM in the range of high modulation index
- 5.4 Optimized operational map in range of high modulation index
- 6 Direct Torque Control with ALE
- 7 Active Lifetime Extension
- 7.1 Failures of IGBTs
- 7.2 Estimation of expected lifetime of IGBT
- 7.3 Impact of loss redistribution on expected lifespan of 3L-NPC VSI
- 8 Conclusion
- 9 Appendix
- References