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Pub. No.:    WO/2018/145724    International Application No.:    PCT/EP2017/052596
Publication Date: Fri Aug 17 01:59:59 CEST 2018 International Filing Date: Wed Feb 08 00:59:59 CET 2017
IPC: H02J 3/36
H02M 7/757
Applicants: ABB SCHWEIZ AG
Inventors: JIANG-HÄFNER, Ying
A converter station (250) for a high voltage direct current transmission system (200) is provided. The converter station comprises a first converter portion (270) connectable to a first direct current, DC, pole (230) and a second converter portion (280) connectable to a second DC pole (232). Further, each of the first and second converter portions may include at least one full-bridge modular-multilevel converter, FB MMC (220, 224), having one terminal (236, 238) connected to the first DC pole or the second DC pole, respectively, or to another converter of the first and second converter portions, respectively, and another terminal (237, 239) connected to another converter (222, 226) or a neutral bus (234). The converter station may also include a protective device (260) connected between the two terminals (236-237, 238-239) of the at least one FB MMC and in parallel with the at least one FB MMC.