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1. (WO2018219174) FAULT SWITCH CONFIGURATION AND CLEARING METHOD IN FLEXIBLE DC CONVERTER STATION

Pub. No.:    WO/2018/219174    International Application No.:    PCT/CN2018/087791
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Wed May 23 01:59:59 CEST 2018
IPC: H02H 7/26
Applicants: NR ELECTRIC CO., LTD
南京南瑞继保电气有限公司
NR ENGINEERING CO., LTD
南京南瑞继保工程技术有限公司
Inventors: LU, Yu
卢宇
LI, Gang
李钢
TIAN, Jie
田杰
WANG, Nannan
汪楠楠
LI, Haiying
李海英
JIANG, Chongxue
姜崇学
SUI, Shunke
随顺科
Title: FAULT SWITCH CONFIGURATION AND CLEARING METHOD IN FLEXIBLE DC CONVERTER STATION
Abstract:
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.