CAJ | 학술논문

南澳多端柔性直流输电示范工程(简称为南澳柔直工程)是世界上第一个VSC-MTDC工程。介绍了南澳柔直工程的系统接入设计方案和换流站设计方案。该工程在南澳岛上建设2个直流送端换流站(金牛站和青澳站)，在大陆塑城变电站附近建设1个直流受端换流站(塑城站)。将岛上的风电经柔直线路“青澳—金牛”和“金牛—塑城”送出，并在塑城变电站接入交流系统。通过三种方案的比较，决定换流站接地方式为：联接变压器采用△/Yn 形式，在阀侧设置Y接变压器中性点电阻以得到接地点。按功能分区明确、工艺流程紧凑、节能和协调周围环境的原则设计了换流站电气总平面布置方案。
남오다단유성직류수전시범공정(간칭위남오유직공정)시세계상제일개VSC-MTDC공정。개소료남오유직공정적계통접입설계방안화환류참설계방안。해공정재남오도상건설2개직류송단환류참(금우참화청오참)，재대륙소성변전참부근건설1개직류수단환류참(소성참)。장도상적풍전경유직선로“청오—금우”화“금우—소성”송출，병재소성변전참접입교류계통。통과삼충방안적비교，결정환류참접지방식위：련접변압기채용△/Yn 형식，재벌측설치Y접변압기중성점전조이득도접지점。안공능분구명학、공예류정긴주、절능화협조주위배경적원칙설계료환류참전기총평면포치방안。
Nan’ao VSC-MTDC Demonstration Project is the first VSC-MTDC project in the world. The design scheme of the system access and converter station is introduced. The sending converter stations, Jinniu station and Qing’ao station, are built at Nan’ao island while a accepting converter station, Shucheng station, is set up near Shucheng substation in the mainland. The wind power of the wind farms at Nan’ao island is sent out through DC lines of Qing’ao-Jinniu and Jinniu-Shucheng, and integrated into the AC system at Shucheng substation. In comparison of three grounding schemes, one of them is adopted, in which the △/Yn form is for transformer interconnection, and a grounding point with a neutral resistor in the Yn transformer side is chosen. According to the principles of clear function zoning, compact process, energy saving and coordination with the surrounding environment, the general electric layout plan of the converter station is designed.