Voltage Source Converter (VSC)

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Table of contents

1. Introduction
1.1 Background
1.2 Motivations and Objectives
1.3 Outline of Thesis
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
2. Isolated AC/DC Converter
2.1 Introduction to Converter
2.2 Converter Topology
2.2.1 Voltage Source Converter (VSC)
2.2.2 Cycloconverter
2.2.3 Medium Frequency Transformer
2.2.4 Output Filter
2.3 Principle of Operation
2.4 Commutation Sequence
2.5 Commutation process with an aspect of losses
2.5.1 VSC commutation
2.5.2 Cycloconverter Commutation
Loss perspective
2.5.3 Resonant commutation
2.5.4 Voltage and Currents
2.5.5 Modulation
2.5.6 Medium frequency transformer with loss aspects
2.5.7 LC filter with loss aspects
2.6 Summary
3. Evaluation of Losses
3.1 Introduction
3.2 Power semiconductor Losses
3.2.1 Conduction Losses
3.2.2 Switching Losses
IGBTs
Diode reverse recovery losses
Total semiconductor losses in VSC and Cycloconverter
Power Loss Modeling of Isolated AC/DC converter
3.2.3 Thermal Characteristics of Power Semiconductors
Thermal resistance from junction to case ( )
Thermal resistance from case to sink ( )
Thermal resistance from sink to ambient ( )
3.3 RC-Snubber Losses
3.3.1 VSC Commutation
3.3.2 Cycloconverter Commutation
3.3.3 Additional Losses due to cycloconverter commutation
3.4 Losses in Transformer and Reactor
3.4.1 Core losses
Original Steinmetz equation
Modified Steinmetz equation
Generalized Steinmetz Equation
Improved Generalized Steinmetz Equation
3.4.2 Core Losses in Transformer
Proposed method for core losses
3.4.3 Core Losses in Inductor
Proposed method for Core loss calculation
3.4.4 Copper Losses
4. Model of Prototype Converter
4.1 Introduction
4.1.1 VSC
4.1.2 Cycloconverter
4.1.3 Transformer
4.1.4 RC Snubbers
4.1.5 Output Filter
4.2 MATLAB Implementation
4.2.1 Simulation
4.4 Simulation Results
5. Calculation of Losses
5.1 Power semiconductor losses
5.1.1 Conduction losses
5.1.2 Switching Losses
Switching losses in IGBTs
Diode reverse recovery losses
Total power semiconductor losses
5.1.3 Thermal model
Cycloconverter
VSC
5.2 Snubber losses
5.3 Transformer Losses
5.3.1 Copper Losses
5.3.2 Core Losses
5.4 Inductor losses
5.4.1 Copper Losses
5.4.2 Core Losses
5.5 Comparison of results
5.5.1 Variable Load current
5.5.2 Low Input DC-link Voltage
5.5.3 Modulation Index Variation
Results and Discussion
6. Conclusion
Future Work
Works Cited
Appendix
VSC Data Sheet
Cycloconverter Data Sheet
Loss Curves of Transformer