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1. (WO2018130280) METHOD AND SYSTEM FOR FAULT HANDLING IN DC POWER TRANSMISSION

Pub. No.:    WO/2018/130280    International Application No.:    PCT/EP2017/050503
Publication Date: Fri Jul 20 01:59:59 CEST 2018 International Filing Date: Thu Jan 12 00:59:59 CET 2017
IPC: H02M 1/32
H02J 3/36
Applicants: ABB SCHWEIZ AG
Inventors: JIANG-HÄFNER, Ying
Title: METHOD AND SYSTEM FOR FAULT HANDLING IN DC POWER TRANSMISSION
Abstract:
A method for fault handling in direct current, DC, power transmission between a first alternating current, AC, system and a second AC system is provided. The method includes detecting an occurrence of a phase-to-ground fault on an AC side of a voltage-source converter, VSC, connected to the second AC system and operated as an inverter. The method further includes, upon detecting the occurrence of the phase-to-ground fault, firing a bypass valve pair of a current-source converter, CSC, connected to the first AC system and operated as a rectifier. A power transmission system is also provided.