CAJ | 학술논문

柔性直流输电系统用于多端输电方式时,其启动过程中各站间配合是系统稳定并快速达到运行状态的关键。针对三端模块化多电平(modular multilevel converter, MMC)柔性直流输电系统正常启动,设计了“一拖二拟合启动”的方式,即由一个逆变站带两个整流站启动,启动过程中适时切换控制方式,以获得平稳的启动过程。在 PSCAD/ EMT-DC 中建立了仿真模型,验证了该启动方式的可行性。此外,对多端直流启动的特殊工况进行了初步探索。
유성직류수전계통용우다단수전방식시,기계동과정중각참간배합시계통은정병쾌속체도운행상태적관건。침대삼단모괴화다전평(modular multilevel converter, MMC)유성직류수전계통정상계동,설계료“일타이의합계동”적방식,즉유일개역변참대량개정류참계동,계동과정중괄시절환공제방식,이획득평은적계동과정。재 PSCAD/ EMT-DC 중건립료방진모형,험증료해계동방식적가행성。차외,대다단직류계동적특수공황진행료초보탐색。
As the voltage-source converter high voltage direct current (HVDC) transmission is for multi-terminal transmission, the co-ordination of each terminal is important to keep the system stable. In this paper, a novel method of single terminal energizing with fit-ting congtrol to start the modular multilevel converter (MMC) is proposed for a three-terminal MMC-HVDC system with 2 rectifiers and 1 inverter. The inverter side AC system is used to charge the inverter and other 2 rectifiers. During the start process, the control-lers are properly enabled to obtain smooth start process. A three terminal simulation system is built in PSCAD/ EMTDC to verify the feasibility of the proposed method. Simulating results show that the proposed method is effective. In addition, the start process of multi-terminal MMC systems under some special operation conditions is also discussed.