CAJ | 학술논문

多端高压直流（multi—terminal direct current，MTDC）输电系统可以实现各换流站所连交流系统之间的功率输送或电力交换，能够解决多电源供电或多落点受电的输电问题，其接线形式总体分为串联型与并联型。针对4端并联型高压直流输电系统进行稳态运行和暂态故障过程的相关研究，基于EMTDC／PSCAD平台建立单极仿真模型，完成了多种解锁起动和闭锁停运组合的仿真分析，设计了直流功率平衡控制器实现各换流站功率协调控制，并提出了单个换流站紧急停运以及直流线路故障时的控制保护配合方式，仿真结果表明了控制与保护策略的有效性。
다단고압직류（multi—terminal direct current，MTDC）수전계통가이실현각환류참소련교류계통지간적공솔수송혹전력교환，능구해결다전원공전혹다낙점수전적수전문제，기접선형식총체분위천련형여병련형。침대4단병련형고압직류수전계통진행은태운행화잠태고장과정적상관연구，기우EMTDC／PSCAD평태건립단겁방진모형，완성료다충해쇄기동화폐쇄정운조합적방진분석，설계료직류공솔평형공제기실현각환류참공솔협조공제，병제출료단개환류참긴급정운이급직류선로고장시적공제보호배합방식，방진결과표명료공제여보호책략적유효성。
Multi-terminal high voltage direct current （MTDC） power transmission system can implement power transmission or power exchange between converter stations and the AC power transmission systems connecting to the formers. It can also solve the problem of power transmission while there are multi power sources or multi receiving ends. In general, the connection patterns of MTDC can be divided into two forms, i.e., the connection in parallel and the connection in series. In this paper, the steady-state operation and transient fault process of four-terminal parallel HVDC power transmission system are researched. Based on the platform of EMTDC/PSCAD a monopole simulation model is built to carry out the simulation on multi combinations of deblock startup with block-caused outage, and a DC power balance controller is designed to implement the coordinated power control among converter stations. Besides, a cooperation mode of the controller with the protection under emergency outage of single convener station or under fault occurred in DC transmission line is put forward, and simulation results show that the proposed control and protection strategies are effective.