US 12,272,955 B2
Bipole power transmission schemes
Mita Babu Narayanan, Stafford (GB); Omar Jasim, Stafford (GB); and Carl Barker, Stafford (GB)
Assigned to GE Infrastructure Technology LLC, Greenville, SC (US)
Appl. No. 17/998,214
Filed by General Electric Technology GmbH, Baden (CH)
PCT Filed May 21, 2021, PCT No. PCT/EP2021/063649
§ 371(c)(1), (2) Date Nov. 8, 2022,
PCT Pub. No. WO2021/234145, PCT Pub. Date Nov. 25, 2021.
Claims priority of application No. 20275094 (EP), filed on May 22, 2020.
Prior Publication US 2023/0223759 A1, Jul. 13, 2023
Int. Cl. H02J 3/36 (2006.01); H02J 3/38 (2006.01); H02J 3/40 (2006.01)
CPC H02J 3/36 (2013.01) [H02J 3/381 (2013.01); H02J 3/40 (2013.01); H02J 2300/28 (2020.01)] 10 Claims
OG exemplary drawing
 
1. A bipole power transmission scheme comprising a first converter station positioned in-use remote from a second converter station, and first and second transmission conduits to in-use interconnect the first converter station with the second converter station and thereby permit the first converter station to transmit power to the second converter station, the first converter station including:
a first power converter electrically interconnecting the first transmission conduit with a first variable power source and in-use transferring power from the first variable power source into the first transmission conduit; and
a second power converter electrically interconnecting the second transmission conduit with a second variable power source and in-use transferring power from the second variable power source into the second transmission conduit, wherein the first and second variable power sources are not interconnected to each other in a first stage of the bipole power transmission scheme,
the bipole transmission scheme further including a converter station controller programmed to selectively transition the bipole power transmission scheme into an asymmetrical monopole configuration, while maintaining the transfer of power from both the first and second variable power sources, by:
establishing a temporary bus bar electrically interconnecting the first and second variable power sources in a second stage of the bipole power transmission scheme;
configuring one power converter connected to the transmission conduit intended to continue transmitting power in the monopole configuration as a master converter operating in a grid-forming mode in the second stage;
configuring the other power converter connected to the transmission conduit intended to cease transmitting power in the monopole configuration as a slave converter operating in a grid-following mode in the second stage; and
controlling the slave converter to reduce to zero the power being fed into the transmission conduit connected therewith in a third stage of the bipole power transmission scheme.