电网技术2026，Vol.50Issue(6)：2434-2445,中插45,13.DOI:10.13335/j.1000-3673.pst.2025.0519
±800kV/8000MW分址级联特高压直流输电工程系统设计研究
Research on System Design of 800kV/8000 MW Site-separated Cascaded UHVDC Transmission Project
摘要
Abstract
To optimize clean energy integration efficiency,enhance system flexibility,the site-separated cascaded ultra-high voltage direct current(UHVDC)transmission project was developed.This paper proposes an innovative system design for a±800 kV UHVDC site-separated cascaded transmission project.It conducts in-depth research and discussion on the main circuit topology and operation modes,insulation coordination and air clearance,DC control and protection strategies,and lean equipment design.Several site-separated cascaded main circuit schemes are compared and optimized,significantly improving the operational flexibility and reliability of the DC system.A graded arrester configuration is proposed to reduce energy levels effectively.A multi-terminal coordinated site-separated cascaded control and protection system and an integrated monitoring solution are introduced,ensure stable and adaptive operation of the DC system under complex topologies.Additionally,lean design schemes for converter valves and converter transformers under high-altitude conditions are presented,significantly reducing equipment costs.The research findings of this paper have been applied to the Jinshang-Hubei±800 kV UHVDC transmission project and provide theoretical and practical support for the system design of future multi-terminal UHVDC transmission projects.关键词
特高压直流/分址级联/绝缘配合/设备精益化设计/直流控制保护策略Key words
ultra-high voltage direct current(UHVDC)/site-separated cascading/insulation coordination/lean design of equipment/DC control and protection strategy分类
信息技术与安全科学引用本文复制引用
张全,李明,赵峥,徐莹,王玲,高子健..±800kV/8000MW分址级联特高压直流输电工程系统设计研究[J].电网技术,2026,50(6):2434-2445,中插45,13.基金项目
智能电网重大专项(2030)(项目编号:2024ZD0801400)资助.Project Supported by Smart Grid-National Science and Technology Major Project(Project No.2024ZD0801400). （2030）
