柔性直流输电技术:应用、进步与期望

VSC-HVDC Transmission Technology: Application,Advancement and Expectation

柔性直流输电技术是构建灵活、坚强、高效电网和充分利用可再生能源的有效途径,代表着直流输电的未来发展方向,已成为新一代智能电网的关键技术之一。概述了国内外柔性直流输电工程的现状以及柔性直流输电技术在交流电网的异步互联、风电场并网、海上平台供电和城市负荷中心供电等领域的应用情况;重点介绍了世界第一个多端柔性直流输电工程——南澳多端柔性直流输电示范工程的研发情况,尤其是其技术难点;指出了直流输电混合化,高电压大容量化,直流输电网络化和直流配电网等未来柔性直流输电技术发展的主要方向;提出了柔性直流输电系统亟待解决的关键问题,诸如具有直流短路故障电流清除能力的电压源换流器拓扑结构,高压直流断路器技术和直流电网运行的基础理论及控制保护技术。

VSC-HVDC is a promising technology for constructing a flexible, robust and efficient power grid and taking full advantage of renewable resources. It represents the development trend of the HVDC technology and becomes a key technology in the smart grid. An overview is given of the application and status quo of VSC-HVDC projects in the world. The main application fields have been summarized, namely the asynchronous grids interconnection, wind power integration, offshore platform power supply, and urban power supply. The research and engineering results of Nan＇ao VSC-MTDC Demonstration Project, the first one of multi-terminal in the world, are stressed and analyzed, especially on its key technology. Engineering application trends of VSC-HVDC are raised such as mixed HVDC system, high voltage and large capacity application, HVDC grid and DC distribution network. At last, the key problems to be solved are proposed, including the VSC topology being capable of DC fault clearing, DC breaker technology and the basic theory and control protection technology of DC grid operation.