Research and Analysis on the Electrical Structure and Control Logic of Valve Base Electronic Equipment at the Send-end Station of the Kunliu Long DC Project

Kunliulong DC Project is the first UHV multi-terminal hybrid DC in the world. It uses valve-based electronic equipment with domestic technology route, and its internal electrical structure and control logic are quite different from that of Siemens technology route converter valve. Since the stability of valve based electronic equipment is directly related to the reliable operation of DC system, this paper studies the electrical structure of valve based electronic equipment, sorts out its control logic, analyzes its possible structural hidden dangers, and puts forward several feasible countermeasures, which is of great significance for avoiding the risk of valve locking caused by abnormal valve based electronic equipment.