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|1. (WO2018219174) FAULT SWITCH CONFIGURATION AND CLEARING METHOD IN FLEXIBLE DC CONVERTER STATION|
|Applicants:||NR ELECTRIC CO., LTD
NR ENGINEERING CO., LTD
|Title:||FAULT SWITCH CONFIGURATION AND CLEARING METHOD IN FLEXIBLE DC CONVERTER STATION|
A fault switch configuration and clearing method in a flexible direct current (DC) converter station. A network side switch (QF1) and a valve side split phase switch (QF2) are configured by the flexible DC converter station. When a fault occurs, a fault phase and a non-fault phase are detected and identified by means of differential protection or low voltage overcurrent. An alternating current (AC) zero crossing condition is created by means of first cutting the non-fault phase valve side split phase switch (QF2) and the network side switch (QF1), thereby removing the fault phase, disconnecting the connection between a power supply and a fault point, and achieving fault removal. The described fault-cutting method is simple and practical, highly reliable, and connection between the fault point and the power supply is quickly and effectively cut; converter station equipment is effectively protected, and further expansion of the fault is avoided.