CAJ | 학술논문

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。
유성직류수전기술시구건령활、견강、고효전망화충분이용가재생능원적유효도경，대표착직류수전적미래발전방향，이성위신일대지능전망적관건기술지일。개술료국내외유성직류수전공정적현상이급유성직류수전기술재교류전망적이보호련、풍전장병망、해상평태공전화성시부하중심공전등영역적응용정황；중점개소료세계제일개다단유성직류수전공정———남오다단유성직류수전시범공정적연발정황，우기시기기술난점；지출료직류수전혼합화，고전압대용양화，직류수전망락화화직류배전망등미래유성직류수전기술발전적주요방향；제출료유성직류수전계통극대해결적관건문제，제여구유직류단로고장전류청제능력적전압원환류기탁복결구，고압직류단로기기술화직류전망운행적기출이론급공제보호기술。
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 pow-er 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.