Abstract：A new generation of control and protection platform has been developed to meet the refurbishment needs of the Three Gorges Changzhou ±500kV HVDC project, such as screen removal transformation and in-situ replacement of the control and protection host. It has the advantages of small size, strong performance and rich interfaces. In order to be compatible with the interface with existing external devices, the host external interface is designed to reduce the intermediate forwarding link and improve the performance of the interface. Aiming at the problems such as power generation when both sets of control hosts fail, overvoltage when line fails to step down and restart, and failure to execute accurately when the inverter side requests power back down, the control and protection strategy is optimized to improve reliability, greatly shorten the program execution cycle, and reduce the risk of commutation failure. The joint commissioning test in the plant and the field operation show that the above design scheme is effective, and the successful implementation of this scheme can provide a reference for the subsequent transformation of other projects.
李林, 王永平, 黄志岭, 卢亚军. 三峡—常州±500kV直流输电工程控制保护系统改造[J]. 电气技术, 2022, 23(12): 38-43.
LI Lin, WANG Yongping, HUANG Zhiling, LU Yajun. Refurbishment of control and protection system for Three Gorges-Changzhou HVDC project. Electrical Engineering, 2022, 23(12): 38-43.
2022, Vol. 23 
