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1. (WO2018166846) GROUNDING ARRANGMENT FOR A VOLTAGE SOURCE CONVERTER

Pub. No.:    WO/2018/166846    International Application No.:    PCT/EP2018/055496
Publication Date: Fri Sep 21 01:59:59 CEST 2018 International Filing Date: Wed Mar 07 00:59:59 CET 2018
IPC: H02M 1/32
H02M 7/483
Applicants: GENERAL ELECTRIC TECHNOLOGY GMBH
Inventors: JONES, Philip S
EVANS, Michael
Title: GROUNDING ARRANGMENT FOR A VOLTAGE SOURCE CONVERTER
Abstract:
A grounding arrangement for a Voltage Source Converter (VSC) in a power transmission system is provided. The VSC comprises at least one converter branch (20) comprising at least one module (221-22N),each module comprising a plurality of serially connectedsub-modules (241-248) that can be controllably switched to generate a controlled voltage across the module (221-22N) and each module including a first sub- module (241) at one end thereof and a last sub-module (248) at an opposite end thereof. Each sub-module (241-248) includes a first terminal (381), a second terminal (382), an energy storage element (30) and a switching arrangement (32, 34), wherein at least one of the first (381) or second terminals (382) is coupled to a terminal of the energy storage unit (30). A first terminal (381) of the first sub-module (241) of a module (221) at one end of the converter branch (20) is configured to be connected to earth potential on or after shutdown of the converter, and a second terminal (382) of the last sub-module (248) of the module (22N) at the opposite end of the converter branch (20) is configured to be connected to earth potential on or after shutdown of the converter. A grounding arrangement (40) comprising a plurality of switch units (42) is provided, each switch unit (42) associated with one of the plurality of sub-modules (241-248) of each module (221-22N) and configured to connect the first (381) and second (382) terminals of the associated sub-module (241-248) on remote activation of the grounding arrangement (40), following connection to earth potential of the first (241) and last sub-modules (248) of the converter branch (20).