1 Introduction
1.1 Decomposition of Power Electronics Systems
1.1.1 Power Semiconductor Devices
1.1.2 Power Conversion Circuit
1.1.3 Pulse Control
1.2 Synthesis of Power Electronics Systems
1.2.1 Integration of Software and Hardware
1.2.2 Interaction Between Information and Energy
1.2.3 Transfer Between Linearity and Non-linearity
1.2.4 Mixture of Continuity and Discreteness
1.2.5 Coordination of Multi-timescale Subsystems
1.3 Applications of Power Electronics Systems
1.3.1 Flexible AC or DC Current Transmission
1.3.2 Power Electronic Systems in Grid-Tied Renewable
Energy Generation
1.3.3 Traction System
1.4 Existing Challenges in Power Electronics Systems
1.4.1 Misunderstanding the Short-Timescale Switching
Process of Power Switches
1.4.2 Idealization of Power-Conversion Topology
for Transient Study.
1.4.3 Unrecognizing the Difference Between Information
Pulses and Energy Pulses
1.4.4 Misidentifying Electromagnetic Transients
2 Electromagnetic Transients and Modelling
2.1 Electromagnetic Transients of Power Electronics Systems
2.1.1 Electromagnetic Transients in the Main-Power Loop
2.1.2 Electromagnetic Transients in the Gate-Drive Loop
2.1.3 Electromagnetic Transients in the Control Loop
2.2 Mathematical Models of Electromagnetic Transients
2.2.1 Modelling Electromagnetic Transients
2.2.2 Transient Model of the Main-Power Loop
2.2.3 Transient Models of Electric Components
2.2.4 Transients Model of Gate-Drive and Control Circuits
2.3 Timescale Difference and Impact
2.3.1 Comparison of Different Time-Scale Transients
2.3.2 Correlations Among Different Time-Constant Loops.
2.3.3 Impact of the Time-Constant Difference.
2.3.4 Loop-Parameter Matching for Energy Balancing
2.4 Electromagnetic Pulses and Pulse Sequences
2.4.1 Mathematical Expression of the Electromagnetic
Pulses and Pulse Sequences
2.4.2 Propagation and Deformation of the Pulse
and Pulse Sequence
2.4.3 Time and Logic Combination of Pulse Sequence
3 Transient Characteristics of Power Switches.
3.1 Physical Mechanism and Characteristics of Power Switches
3.1.1 Physical Mechanism Versus the Switching
Characteristics
3.1.2 Different Characteristics of Different Semiconductor-
Physics Based Power Devices
3.2 Transient Performance Testing of the Power Switch
in the Converter
3.2.1 Topology and Control of the Single-Switch Tester
3.2.2 Stand-Alone Tester for Single-Switch Dynamics
3.2.3 Transient Characteristics of a Single Switch
in the Converter
3.3 Transient Performance Analysis of Power Devices
in the Converter
3.3.1 Switch Performance During the Operation
3.3.2 Interactions Among Switches
3.4 Power Devices in Parallel Connection
3.4.1 Key Influential Factors on the Switch Parallel
3.4.2 Performance Analysis of Paralleled IGBTs.
3.4.3 Experimental Study of IGBT Parallel
3.5 Power Devices in Series Connection
3.5.1 Fundamentals of the Switches in Series Connection.
3.5.2 IGCTs in Series Connection
4 Transient Commutation Topology and Its Stray Parameters
4.1 Definition of the TCT
4.1.1 Definition of the Converter Topology
4.1.2 Converter Transient Commutation Topology
4.2 Extractions of Stray Parameters in Complex Main Circuits
4.2.1 Comparison of Extraction Approaches
4.2.2 Accuracy Analysis of PEEC
4.2.3 Simplification of Stray-Parameter Extractions
in the Complex Structures
4.3 Analysis of Stray Parameters in IGBT Based Converters
4.3.1 Impact of Stray Parameters on the IGBTs
in the Power Converter
4.3.2 Modelling of DC Bus Bars in the IGBT Based
Converter
4.4 Analysis of Stray Parameters in IGCT Based Converters
4.4.1 Modelling of DC Bus Bars in a Three-Level IGCT

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