The high-power grid-connected converters play a vital role in modern power system, realizing the conversion and transmission of electrical energy, and determining its safety, stability and efficiency. This book explores the advanced control strategies of high-power grid-connected converter to satisfy the high-power requirements in practical applications. Special attention is given to grid-connected converter modules in parallel operation to overcome the challenges of non-ideal power grid, power switches faults, and circulating current. Through the advanced control strategies presented in this book, the power capacity of grid-connected converter is flexibly increased with high-reliability and efficiency, thus expanding the application range of high-power converters in modern power system. To facilitate understanding, this book provides step-by-step model derivation and controller design for grid-connected converter. Meanwhile, it also provides the comprehensive simulation and experimental results to offer readers a deep insight into the control process of grid-connected converters. This book serves as a guide for electrical engineers and researchers involved in the development of high-power converters.
Author(s): Chenghui Zhang
Publisher: Springer
Year: 2022
Language: English
Pages: 278
City: Singapore
Preface
Acknowledgements
Contents
About the Author
Abbreviations
1 Introduction
1.1 Application of High-Power Grid-Connected Converters
1.2 Configurations of High-Power Grid-Connected Converter
1.2.1 Parallel Power Switches
1.2.2 Parallel Power Converter Modules
1.3 Operating Challenges
1.3.1 Non-ideal Power Grid
1.3.2 Switches Faults
1.3.3 Circulating Current
1.4 Content of This Book
References
2 Fundamentals of Grid-Connected Power Converters
2.1 Operating Principle
2.1.1 Single-Phase Power Converter
2.1.2 Three-Phase Three-Leg Power Converter
2.1.3 Three-Phase Four-Leg Power Converter
2.2 Modeling
2.2.1 Single-Phase Power Converter
2.2.2 Three-Phase Three-Leg Power Converter
2.2.3 Three-Phase Four-Leg Power Converter
2.3 Control Schemes
2.3.1 Phase-Locked Loop
2.3.2 Current Control Loop
2.3.3 Voltage Control Loop
2.3.4 Neutral Point (NP) Voltage Control Loop
2.4 Summary
References
3 Control of Single-Phase High-Power Converter
3.1 Operating Principle
3.2 Modeling and Analysis of Circulating Current (CC)
3.2.1 Modeling
3.2.2 Analysis
3.3 Control Schemes
3.3.1 Control of Grid Current Without AC Voltage Sensor
3.3.2 Control of NP Voltage Balance with Switching Losses Reduction
3.3.3 Control Strategy for Circulating Current Suppression
3.4 Experimental Verification
3.4.1 Control Performance of Grid Current Tracking
3.4.2 Control Performance of NP Voltage Balance and Switching Losses Reduction
3.4.3 Control Performance of Circulating Current Suppression
3.5 Summary
References
4 Control of Three-Phase Three-Leg High-Power Converter
4.1 Operating Principle
4.2 Modeling
4.2.1 Switched Model
4.2.2 Quasi-Averaged Switch Model
4.2.3 Averaged Switch Model
4.3 Control Schemes
4.3.1 Control Strategy for Low-Frequency Zero-Sequence Circulating Current (LFZSCC) Suppression
4.3.2 Control Strategy for High-Frequency Zero-Sequence Circulating Current (HFZSCC) Suppression
4.4 Experimental Verification
4.4.1 Control Performance of LFZSCC Suppression
4.4.2 Control Performance of HFZSCC Suppression
4.5 Summary
References
5 Control of Three-Phase Three-Leg High-Power Converter Under Non-ideal Conditions
5.1 Under Unbalanced Power Grid and Asymmetric Filter Inductor Conditions
5.1.1 Operating Principle
5.1.2 Modeling
5.1.3 Control Schemes
5.1.4 Experimental Verification
5.2 Under Power Switches Fault Conditions
5.2.1 Operating Principle
5.2.2 Modeling
5.2.3 Control Schemes
5.2.4 Experimental Verification
5.3 Summary
References
6 Control of Three-Phase Four-Leg High-Power Converter
6.1 Operating Principle
6.2 Modeling
6.2.1 Switched Model
6.2.2 Quasi-Averaged Switch Model
6.3 Control Schemes
6.3.1 Control Strategy for Zero-Sequence Circulating Current Suppression
6.3.2 Control of NP Voltage Balance
6.3.3 Overall Control Schemes
6.4 Experimental Verification
6.4.1 Control Performance of Harmonic Compensation
6.4.2 Control Performance in Steady State
6.4.3 Control Performance in Dynamic State
6.5 Summary
References
