Control and Protection System Design of Zhangbei VSC-HVDC grid

Zhangbei Project is the first VSC-HVDC grid in the world. Also, the project has the highest voltage and biggest capacity. Control and protection system directly determines the operation characteristics of VSC-HVDC grid. It is greatly significant for improving dc system performance and ensuring the safety of dc grid. Special requirement of VSC-HVDC grid operation for control and protection system is studied, and control and protection system architecture and function configuration for Zhangbei Project are presented. Firstly, considering characteristics of dc grid, several key control functions are systematically put forward, including start-stop control of converter and grid, etc. Corresponding analysis and research are given. Secondly, protection zoning and key protection functions of dc grid are systematically proposed. Pole protection and valve protective are respectively studied. Complete technical ideas and design method of control and protection system in Zhangbei VSC-HVDC grid is presented. The research results provide technical basis for project control and protection scheme.