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Über dieses Buch

This book discusses topics related to power electronics, especially electromagnetic transient analysis and control of high-power electronics conversion. It focuses on the re-evaluation of power electronics, transient analysis and modeling, device-based system-safe operating area, and energy balance-based control methods, and presenting, for the first time, numerous experimental results for the transient process of various real-world converters.

The book systematically presents both theoretical analysis and practical applications. The first chapter discusses the structure and attributes of power electronics systems, highlighting the analysis and synthesis, while the second chapter explores the transient process and modeling for power electronics systems. The transient features of power devices at switching-on/off, transient conversion circuit with stray parameters and device-based system-safe operating area are described in the subsequent three chapters. The book also examines the measurement of transient processes, electromagnetic pulses and their series, as well as high-performance, closed-loop control, and expounds the basic principles and method of the energy-balanced control strategy. Lastly, it introduces the applications of transient analysis of typical power electronics systems.

The book is valuable as a textbook for college students, and as a reference resource for electrical engineers as well as anyone working in the field of high-power electronics system.

Inhaltsverzeichnis

Frontmatter

Chapter 1. Introduction

Abstract
The major difference between power electronics and microelectronics is the power rating. All the power electronics systems in this book are rated beyond tens of kilowatts up to multiple megawatts, with the voltage level above hundreds of volts and current over tens of amperes and even thousands of amperes, facing various applications.
Zhengming Zhao, Liqiang Yuan, Hua Bai, Ting Lu

Chapter 2. Electromagnetic Transients and Modelling

Abstract
Transients are the norms and the musts of the energy conversion in power electronics systems. Previous research is focused on the large-timescale electromagnetic transient processes, while neglecting short-timescale switching processes and stray parameters. When failure mechanisms of components and the enhancement of the power-conversion capability are to be emphasized, such short-timescale transients must be taken into account. To fully understand electromagnetic transients, establishing the mathematical model of full-timescale transients is the fundamental.
Zhengming Zhao, Liqiang Yuan, Hua Bai, Ting Lu

Chapter 3. Transient Characteristics of Power Switches

Abstract
Power switches are building blocks of power electronics, with their characteristics fully exhibited only in power electronic converters. At the system perspective, power switches are one of main factors in power electronic systems and determine electromagnetic transients when coupled with other factors like the main-power circuit and control algorithms. As the critical bridge between the software and hardware, they are the places where information and energy mix together, displaying significant nonlinear behaviors. Therefore transient characteristics of power switches are the key to investigate power electronic transients, as determined by the internal physical mechanism and external influential factors.
Zhengming Zhao, Liqiang Yuan, Hua Bai, Ting Lu

Chapter 4. Transient Commutation Topology and Its Stray Parameters

Abstract
The transient commutation topology (TCT) is one of the fundamentals of power electronics transient analysis. Different from the conventional topology based on lumped parameters, the TCT is based on short-timescale transient commutations along with stray parameters. The core is to take stray parameters into account, including the impact analysis, extraction and allocation. In the synthesis of power electronics, the TCT and stray parameters involve multiple factors, such as power semiconductor devices, circuit and control, and emphasize the interaction between switches and TCT. In the decomposition of power electronics, it analytically reveals the relationship between the mechanical structure and circuit parameters, which has a strong non-linear performance. Such TCT and related stray parameters play an important role in the transient analysis and control.
Zhengming Zhao, Liqiang Yuan, Hua Bai, Ting Lu

Chapter 5. System Safe Operation Area Based on Switching Characteristics

Abstract
The concept of the system safe operation area (SSOA) came from transients of power electronic converters. Such a concept is beneficial for the system reliability evaluation and optimization design. It is related to the device safe operation area (DSOA) with however obvious difference. The SSOA involves interactions between switches and other peripherals. From the aspect of the system analysis, the SSOA contains the power semiconductor devices, power conversion circuit and pulse control. It is based on the DSOA, emphasizes the interactions of DSOA, conversion circuit and pulse controls, and resolves the conflict between the reliability and maximum usage of power electronic converters from the aspect of the energy conversion and multi-timescale transients.
Zhengming Zhao, Liqiang Yuan, Hua Bai, Ting Lu

Chapter 6. Measurement and Observation of Electromagnetic Transients

Abstract
Power electronic systems consist of interactions between the information and energy. To implement the effective energy propagation through the control system, the related energy-flow information needs be fed back to the control unit, i.e., measurement and analysis. From the control theory point of view, measurements and observations form the feedback loop of the closed-loop control, acting as the interface between the energy flow and information flow. Since majority of power electronic systems use the digital control algorithm with the discrete control system and information flow, while the main-power circuit carries the continuous energy flow, the observation system is the interface between the continuous and discrete parts of power electronics mixture systems.
Zhengming Zhao, Liqiang Yuan, Hua Bai, Ting Lu

Chapter 7. Electromagnetic Pulses and Sequences in Main Circuit

Abstract
Electromagnetic pulses and pulse sequences are the outcome of control and main circuits, which are also the carrier of energy conversion. From information to energy flow, the pulse and pulse sequence propagation includes signal generation, transfer, shaping, coordination, and transformation.
Zhengming Zhao, Liqiang Yuan, Hua Bai, Ting Lu

Chapter 8. High-Performance Closed-Loop Control and Its Constraints

Abstract
Pulse generation through turning on and off power switches is the fundamental of power electronics conversion. At the macroscopic level, two steady states exist for power switches, i.e., on and off, determining that electromagnetic variables of the power electronics conversion are in the form of pulses, pulse overlapping and combinations, and pulse sequences, e.g., output voltage of the VSI and output current of the CSI. To differentiate from information pulses in the control system and gate-drive circuits, energy-level voltage and current pulses are named as energy pulses. The controllable energy pulse and pulse sequence are basic behaviors of the power electronics conversion.
Zhengming Zhao, Liqiang Yuan, Hua Bai, Ting Lu

Chapter 9. Balance of Electromagnetic Energy in Transients

Abstract
Energy conservation is one of most fundamental rules in physics, which is interpreted as the input energy of any system is equal to the sum of the energy loss, storage and output.
Zhengming Zhao, Liqiang Yuan, Hua Bai, Ting Lu

Chapter 10. Applications of Transient Analysis in Power Converters

Abstract
The analysis methods of electromagnetic transients have been widely used, especially in high-power and high-performance power electronic converters. This chapter will emphasize the application of transient analysis in series connected HV IGBTs with dynamic balancing circuit and SiC device based power amplifiers.
Zhengming Zhao, Liqiang Yuan, Hua Bai, Ting Lu

Backmatter

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