US 11,837,867 B2
HVDC transmission schemes
Chandra Mohan Sonnathi, Stafford (GB); Radnya Anant Mukhedkar, Stafford (GB); Jordann Raymond Martial Brionne, Paris (FR); and Damien Pierre Gilbert Fonteyne, Stafford (GB)
Assigned to General Electric Technology GmbH, Baden (CH)
Appl. No. 17/050,739
Filed by GENERAL ELECTRIC TECHNOLOGY GMBH, Baden (CH)
PCT Filed Apr. 11, 2019, PCT No. PCT/EP2019/059353
§ 371(c)(1), (2) Date Oct. 26, 2020,
PCT Pub. No. WO2019/206671, PCT Pub. Date Oct. 31, 2019.
Prior Publication US 2021/0119444 A1, Apr. 22, 2021
Int. Cl. H02J 3/36 (2006.01); H02J 3/00 (2006.01); H02H 1/00 (2006.01); H02H 7/26 (2006.01)
CPC H02J 3/36 (2013.01) [H02H 1/0007 (2013.01); H02H 7/268 (2013.01); H02J 3/001 (2020.01); H02J 3/00125 (2020.01)] 15 Claims
OG exemplary drawing
 
1. A high voltage direct current transmission system comprising:
a first station comprising first and second HVDC converters coupled in series via a first disconnector and a second disconnector;
a second station comprising series-connected third and fourth HVDC converters, wherein a neutral node coupling the third HVDC converter to the fourth HVDC converter is coupled to earth;
a first transmission line connecting a positive node of the first HVDC converter to a corresponding positive node of the third HVDC converter, wherein a first pole of the system comprises the first HVDC converter, the third HVDC converter and the first transmission line;
a second transmission line connecting a negative node of the second HVDC converter to a corresponding negative node of the fourth HVDC converter, wherein a second pole of the system comprises the second HVDC converter, the fourth HVDC converter and the second transmission line;
wherein a neutral node between the first disconnector and the second disconnector is coupled to a parallel combination of a resistance and a neutral bus ground switch for coupling the neutral node to earth.