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公开(公告)号：US20200067420A1
公开(公告)日：2020-02-27
申请号：US16467419
申请日：2017-12-07
Applicant: General Electric Technology GmbH
Inventor： Xu She , Carl D. Barker , Colin Charnock Davidson
Abstract: In the field of high voltage direct current (HVDC) power transmission a line commutated converter (10) includes a plurality of converter limbs (12A, 12B, 12C) that extend between first and second DC terminals (16, 18). Each converter limb (12A, 12B, 2C) includes first and second limb portions (22, 24) that are separated by an AC terminal (26). The first limb portions (22) together define a first limb portion group (28) and the second limb portions (24) together define a second limb portion group (30). Each limb portion (22, 24) includes at least one switching element (32) in the form of a latching device (34). Each latching device (34) is configured to turn on and conduct current when it is forward biased and it receives a turn on signal, to naturally turn off and no longer conduct current when it is reverse biased and the current flowing through it falls to zero, and to actively turn off and prevent current from flowing therethrough when it receives a turn off signal. The line commutated converter (10) also includes a control unit (38) that is programmed to control switching of the latching devices (34). The control unit (38), during normal operating conditions, successively sends a first latching device (34) in a respective pair of first and second latching devices (34) in one of the first limb portion group (28) or the second limb portion group (30) a turn on signal whereby the first latching device (34) turns on and begins to conduct current while the current flowing through the second latching device (34) begins to fall to zero and the second latching device prepares to naturally turn off. The control unit (38), in the event of abnormal operating conditions arising, sends a turn off signal to the or each latching device (34) experiencing an abnormal current flow therethrough to actively turn it off and prevent current from flowing therethrough.
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公开(公告)号：US11777307B2
公开(公告)日：2023-10-03
申请号：US17270369
申请日：2019-08-14
Applicant: General Electric Technology GmbH
Inventor： Carl D. Barker , Colin Charnock Davidson , John Lewis Outram , Timothy James Stott , Robert Stephen Whitehouse
Abstract: An electronic valve apparatus for a high voltage direct current, HVDC, power transmission system. The electronic valve apparatus includes a first device chain including a number of first devices connected in series between an input node and an output node. Each of the first devices has an asymmetric transfer function configured substantially to block current flow through the device in a first direction, and the first devices are connected such that they all block current flow in the same direction. The electronic valve apparatus also includes a second device chain including a number of second devices connected in series between the input node and the output node. Each of the second devices has an asymmetric transfer function configured substantially to block current flow through the device in a first direction, and the second devices are connected such that they all block current flow in the same direction.
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公开(公告)号：US10778011B2
公开(公告)日：2020-09-15
申请号：US16348459
申请日：2017-10-31
Applicant: GENERAL ELECTRIC TECHNOLOGY GMBH
Inventor： Robert Whitehouse , Carl D. Barker , Ghirmazion Ghebreyesus
IPC: H02J3/36
Abstract: In the field of high voltage direct current (HVDC) power transmission there is provided a power converter assembly (10) comprising a line-commutated power converter (12) that is configured to transfer power from a DC network (14) to a corresponding receiving AC network (16). The power converter assembly (10) also includes a control unit which is operatively associated with the line-commutated power converter (12) and is programmed, in response to the receiving AC network (16) exhibiting a reduced AC voltage (Va, Vb, Vc), to cause a reduction in the operating DC voltage (VDC) of the line-commutated power converter (12) by the DC network (14).
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公开(公告)号：US20200067317A1
公开(公告)日：2020-02-27
申请号：US16348459
申请日：2017-10-31
Applicant: GENERAL ELECTRIC TECHNOLOGY GMBH
Inventor： Robert Whitehouse , Carl D. Barker , Ghirmazion Ghebreyesus
IPC: H02J3/36
Abstract: In the field of high voltage direct current (HVDC) power transmission there is provided a power converter assembly (10) comprising a line-commutated power converter (12) that is configured to transfer power from a DC network (14) to a corresponding receiving AC network (16). The power converter assembly (10) also includes a control unit which is operatively associated with the line-commutated power converter (12) and is programmed, in response to the receiving AC network (16) exhibiting a reduced AC voltage (Va, Vb, Vc), to cause a reduction in the operating DC voltage (VDC) of the line-commutated power converter (12) by the DC network (14).
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