Optimization of DCSC Redundancy Test

Control system switching, as a means of clearing DC faults, can prevent malfunctions caused by faults in measurement, protection and control systems, avoid DC system outages caused by a single system failure, improve the reliability of DC systems, and ensure the safety of DC transmission projects. Safe and stable operation. The ± 500kV LQ converter station is the head converter station of the Yunnan-Guizhou interconnection channel project, Abnormality occurs in the process of DCSC redundancy test. This paper analyzes and studies the anomalies, and proposes optimization measures, which are of great significance to the safe operation and maintenance of the three-terminal HVDC transmission project.