本报告梳理总结了当前特高压交直流输电技术和柔性交直流输电技术的发展现状、主要技术创新和工程实践，结合未来大容量、远距离清洁能源输电及更高可靠性、灵活性联网的技术需求，进一步展望了各技术未来的发展方向，为行业发展提供参考。
报告分为3部分。分别介绍特高压交流、特高压直流和柔性输电技术的发展历程及现状、技术创新、核心设备、试验体系、典型工程和发展展望等内容。

PREFACE
SUMMARY
1 UHV AC Power Transmission Technology
1.1 Overview
1.1.1 International Exploration
1.1.2 Development in China
1.2 Technology Innovation
1.2.1 Key Technologies on System Research
1.2.2 Key Technologies on Overvoltage and External Insulation
1.2.3 Key Technologies on Electromagnetic Environment
1.2.4 Key Equipment Research and Development Technology
1.2.5 Complete Set of System Integration Technology
1.3 Core Equipment
1.3.1 Transformer
1.3.2 GIS
1.3.3 Circuit Breaker
1.3.4 Isolating Switch
1.3.5 Lightning Arrester
1.3.6 Post Insulator
1.3.7 Bushing
1.3.8 Voltage Transformer
1.3.9 Current Transformer
1.3.10 Tower
1.3.11 Conductor
1.3.12 Insulator
1.4 Test System
1.5 Standard System
1.6 Typical Projects
1.6.1 Southeast Shanxi-Nanyang-Jingmen 1000 kV Pilot and Demonstration Project
1.6.2 Huainan-Shanghai 1000 kV Project
1.6.3 Mengxi-South Tianjin 1000 kV Project
1.6.4 Yuheng-Weifang 1000 kV Project
1.6.5 Sutong 1000 kV GIL Comprehensive Pipe Gallery Project
1.6.6 Shandong-Hebei 1000 kV Project
1.7 Technical Outlook
1.7.1 UHV Switchgear for Special Applications
1.7.2 UHV Circuit Breaker with Long Electrical Life and Large Capacity
1.7.3 UHV Transformer with Key Performance Parameters Monitored
1.7.4 UHV AC High-performance Overvoltage Limiter
1.7.5 Environment-Friendly UHV AC Gas-Insulated Transmission Line (GlL) Power Transmission
1.8 Economic Outlook
2 UHV DC Power Transmission Technology
2.1 Overview
2.1.1 International Exploration
2.1.2 Practice in China
2.2 Technological Innovation
2.2.1 Key ±800 kV Technologies
2.2.2 Key ±1100 kV Technologies
2.2.3 Development of Key Equipment
2.2.4 Line Related Equipment
2.2.5 Innovative Hierarchical Connection Mode
2.3 Core Equipment
2.3.1 DC Converter Valve
2.3.2 Converter Transformer
2.3.3 Smoothing Reactor
2.3.4 Converter Station Filter
2.3.5 Lightning Arrester for Converter Station
2.4 Test System
2.5 Standard System
2.6 Typical Projects
2.6.1 Xiangjiaba-Shanghal ±800 kV UHV DC Transmission Demonstration Project
2.6.2 Xilingol League-Taizhou ±800 kV Transmission Project
2.6.3 Qinghai-Henan ±800 kV Transmission Project
2.6.4 Belo Monte ±800 kV Transmission Project in Brazil
2.6.5 Zhundong-Wannan ±1100 kV DC Transmission Project
2.7 Technology Outlook
2.7.1 ±1500 kV/20 GW DC Power Transmission Equipment
2.7.2 UHV DC Controllable Lightning Arrester
2.7.3 UHV Hybrid DC Power Transmission Control and Protection
2.7.4 UHV DC cable
2.7.5 UHV DC Power Transmission Equipment for Extreme Environments
2.8 Economic Outlook
3 Flexible Transmission Technology
3.1 Flexible AC transmission system technology
3.1.1 Overview
3.1.2 Core Technology and Equipment
3.1.3 Typical Projects
3.1.4 Technology Outlook
3.1.5 Economic Outlook
3.2 VSC HVDC transmission technology
3.2.1 Overview
3.2.2 Core Technology and Equipment
3.2.3 Typical Projects
3.2.4 Technology Outlook
3.2.5 Economic Outlook
EPILOGUE
Appendix 1 Key Technical Parameters of UHV Project
Appendix 2 Abbreviations/Definitions