±800 kV特高压直流输电工程技术

±800 kV UHVDC Transmission Engineering Technology

自2005年国家发改委下发了《关于开展百万伏级交流、±800 kV级直流输电技术前期研究工作的通知》以来,中国特高压直流输电技术经历了14 a的发展,实现了直流电压、输送容量和交流侧电压的"三大提升"。截止2018年6月中国建成及在建的特高压直流输电工程共有13条,基本实现了"三送端+三受端"的电网格局。文章从特高压换流技术、控制保护、绝缘配合、特高压直流线路设计和系统可靠性5个方面总结了目前特高压±800 kV直流输电工程技术,并简述了中国特高压输电技术未来的需求及面临的挑战。

Since the issue of Notice on The Preliminary Research Work on The Implementation of The Million-Volt AC And ±800 kV DC Transmission Technology by the National Development and Reform Commission in 2005,China’s UHV DC transmission technology has experienced 14 years of development and realized " Three Major Improvements" in DC transmission voltage,transmission capacity and AC transmission voltage. By the end of June 2018,there were 13 UHV DC transmission projects built or under construction in China,which basically waved the grid pattern of " Three-Transmitting End + Three-Receiving End". This paper summarizes the current UHV ±800 kV DC transmission engineering technology from five aspects of UHV commutation technology,control protection,insulation coordination,UHV DC line design and system reliability,and briefly describes the future demand and challenges of UHV transmission technology in China.