舟山多端柔性直流输电控制保护系统

Control & protection system for Zhoushan multi-terminal VSC-HVDC

对多端柔性直流输电控制及保护系统的分层设计及其功能配置进行了描述。介绍了多端柔性直流输电系统中多站之间的协调控制功能,即当直流电压控制站失去直流电压控制功能后,通过设计的基于站间通信和直流电压偏差检测的自适应策略,可以实现其余功率站的直流电压无偏差接管。介绍了工程采用的快速负序控制、直流侧主动充电以及在线联网转孤岛运行等控制功能设计。最后给出的部分现场试验结果证明了多端柔性直流输电控制保护系统可以很好地满足舟山五端柔性直流输电工程的需求。

The hierarchical design of the control ＆ protection system transmission and its function configuration are described. Its coordinated control function among multiple stations is introduced,i.e, when the DC voltage control station loses the DC voltage control function,one of the other power stations will bumplessly take over the DC voltage control according to the adaptive strategy based on inter-station communication or DC voltage deviation detection. The design of some control functions applied in the project is introduced,such as fast negative-sequence control,active DC-side charging,operating mode switchover,etc. Partial site-test results are given to prove the designed control ＆ protection system satisfying the requirements of Zhoushan five-terminal VSC-HVDC project.