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1. (WO2016058794) PREMAGENTIZING OF MMC CONNECTED TRANSFORMER

Pub. No.:    WO/2016/058794    International Application No.:    PCT/EP2015/071749
Publication Date: Fri Apr 22 01:59:59 CEST 2016 International Filing Date: Wed Sep 23 01:59:59 CEST 2015
IPC: H02H 9/00
H02H 7/045
Applicants: ABB SCHWEIZ AG
Inventors: TURNER, Robert
Title: PREMAGENTIZING OF MMC CONNECTED TRANSFORMER
Abstract:
The present invention is concerned with pre-magnetizing a Modular Multilevel power Converters (MMC,5) connected transformer (3) in order to moderate inrush currents upon connecting the transformer to an electric grid (1). The invention takes advantage of the high amount of stored energy in MMC converters as compared to other converter types. This stored energy is used to pre-magnetize the converter-connected transformer, therefore no additional or dedicated pre-magnetizing hardware is required in addition to the charging hardware provided to charge the converter capacitors. As the transformer pre-magnetizing takes place subsequent to the converter charging, the converter charging circuit is not used to, and therefore does not need to be designed to, directly magnetize the transformer.