General Electric Technology Gmbh

Ge Infrastructure Technology, LLC

Alstom Technology Limited

Other

Ge Vernova Infrastructure Technology LLC

Carl David Barker

Robert Stephen Whitehouse

Andrzej Adamczyk

Robin Gupta

David Reginald Trainer

Colin Charnock Davidson

Omar Fadhel Jasim

Omar Jasim

Rajaseker Reddy Ginnareddy

John Lewis Outram

Amit Kumar

Andre Paulo Canelhas

John Fradley

Chandra Mohan Sonnathi

Timothy James Stott

Rosemary King

Oleg Bagleybter

Pablo Ariel Briff

Mita Babu Narayanan

Pablo Briff

Li Zou

Andrew Nolan

Jose Maneiro

Francisco Jose Moreno Munoz

Ghirmazion Ghebreyesus

Georgios Fintzos

Jose Augusto Monteiro

Hassan Taghizadeh

Francisco Jose Moreno Muñoz

Sunita Khilar

Andrzej Adamcyzk

Rajseker Ginnareddy

An electrical assembly including a power converter having an AC side and a DC side, the AC side for connection to an AC network; at least one power transmission medium connected to the DC side of the power converter; a dynamic braking system operably connected to the power transmission medium, the dynamic braking system including a dynamic braking control unit programmed to selectively control activation of the dynamic braking system to carry out a dynamic braking operation; a monitoring unit for monitoring an electrical parameter of the AC network; and a processing unit programmed to determine an operating state of the AC network from the monitored electrical parameter, wherein the dynamic braking control unit is programmed to be responsive to the determined operating state of the AC network by configuring the dynamic braking system to be activatable.

Electrical assembly with a dynamic braking system

A bipole power transmission scheme includes 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 includes a first power converter, a second power converter, and a converter station controller which is 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 power sources.

Bipole power transmission schemes

Embodiments of the disclosure include an electrical assembly. The electrical assembly can include a converter including a DC side and an AC side, the DC side configured for connection to a DC network, the AC side configured for connection to an AC network, the converter including at least one switching element; a circuit interruption device operably connected to the AC side of the converter; a DC voltage modification device operably connected to the DC side of the converter, the DC voltage modification device including a DC chopper; and a controller configured to selectively control the or each switching element, the circuit interruption device and the DC voltage modification device, wherein the controller is configured to be responsive to a converter internal fault by carrying out a fault operating mode.

Electrical assembly

There is provided a switching valve for a voltage source converter, the switching valve including a number of modules, each module including at least one switching element and at least one energy storage device, the or each switching element and the or each energy storage device in each module arranged to be combinable to selectively provide a voltage source, the switching valve including a controller programmed to selectively control the switching of the switching elements to select one or more of the modules to contribute a or a respective voltage to a switching valve voltage.

Switching valve

A bipole power transmission scheme includes a first converter station that is positioned, in-use, remote from a second converter station. First and second transmission conduits and a return conduit interconnect, in-use, the first converter station with the second converter station and thereby permit the transfer of power between the first and second converter stations. The first converter station includes a first power converter, a second power converter, and a converter station controller.

Relating to bipole power transmission schemes

There is provided a current control circuit () for connection between a first electrical network () and a converter, the current control circuit () comprising:

Current control circuit

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.

Electronic valve apparatus

In the field of high voltage direct current (HVDC) power transmission networks there is a need for an improved power converter. A power converter, for use in a HVDC power transmission network, comprises first and second DC terminals, for connection in use to a DC network and between which extends at least one converter limb. The or each converter limb includes first and second limb portions which are separated by an AC terminal, for connection in use to an AC network. Each limb portion includes a switching valve, and the power converter including a controller programmed to control switching of the switching valves to control the flow of a converter current (I) through the power converter and thereby in-use transfer power between the power converter and the AC network. The power transferred between the power converter and the AC network has an active component and a reactive component. The controller is further programmed in use to:

Relating to power converters

There is provided an electrical assembly for use in a power transmission network. The electrical assembly includes a converter including terminals for connection to an electrical network, where the first terminal is a DC terminal. The assembly also includes a DC power transmission medium connected to the DC terminal, and a circuit interruption device including switching element(s) and an energy absorption element, each switching element being switchable to divert a flow of current in the DC power transmission medium through the energy absorption element in order to reduce the flow of current in the DC power transmission medium; The assembly also includes a converter control unit programmed to operate the converter to control a DC voltage at the DC terminal in a leakage current reduction mode to control a voltage across the energy absorption element.

Electrical assembly for a power transmission network

A converter () comprises first and second DC terminals () connectable in use to a DC network (), the converter () including a converter limb () extending between the DC terminals (), the converter limb () including first and second limb portions separated by an AC terminal (), the AC terminal () connectable in use to an AC voltage, each limb portion including at least one director switch () connected in series with a waveform synthesizer between the AC terminal () and a respective one of the first and second DC terminals (), the waveform synthesizers operable to control the modulation of an AC voltage waveform at the AC terminal (), each director switch () operable to switch the respective waveform synthesizer into and out of circuit between the respective DC terminal () and the AC terminal (); and a controller () programmed to selectively control the switching of the director switches () to switch both of the limb portions into circuit concurrently to form a current conduction path between the DC terminals (), the current conduction path configured to carry a current for presentation to the DC network (), wherein the controller () is programmed to selectively operate the waveform synthesizers to inject at least one harmonic component to modulate the AC voltage waveform at the AC terminal () so that during the formation of the current conduction path the magnitude of the modulated AC voltage waveform is lower than the magnitude of the fundamental component of the AC voltage waveform, and wherein the at least one harmonic component is a non-triplen harmonic component.

Alternate arm converter

In the field of line commutated converters, for use in high voltage direct current (HVDC) power transmission, a line commutated converter comprises a plurality of converter limbs that extend between first and second DC terminals. Each converter limb includes first and second limb portions which are separated by an AC terminal. The first limb portions together define a first limb portion group and the second limb portions together define a second limb portion group. Each limb portion includes at least one switching element that is configured to turn on and conduct current when it is forward biased and it receives a turn on signal and to naturally turn off and no longer conduct current when it is reverse biased and the current flowing through it falls to zero. The converter also includes a control unit.

Line commutated converters

A power transmission network includes converters interconnected via electrical elements, at least one power flow router, and a controller. Each power flow router being operatively connected to the electrical elements, each power flow router configured to selectively control current flow in the electrical elements so as to direct power between two or more of the plurality of converters. The controller configured to selectively control the converters and each power flow router to control power flow in the power transmission network The controller is configured to carry out a mathematical optimisation to determine optimal operating set points of the converters; after carrying out the mathematical optimisation, carry out another mathematical optimisation to determine optimal current flows in the electrical elements; and control the converters in accordance with each determined optimal operating set point, and control the power flow router(s) to achieve each determined optimal current flow in the electrical elements.

Power transmission network

In the field of high voltage direct current (HVDC) power transmission there is provided a power converter assembly () comprising a line-commutated power converter () that is configured to transfer power from a DC network () to a corresponding receiving AC network (). The power converter assembly () also includes a control unit which is operatively associated with the line-commutated power converter () and is programmed, in response to the receiving AC network () exhibiting a reduced AC voltage (V, V, V), to cause a reduction in the operating DC voltage (V) of the line-commutated power converter () by the DC network ().

Power transmission networks

A method and apparatus for controlling a fault blocking voltage source converter apparatus which is, in use, connected to an AC system and a DC system for power transmission, in the event of a DC side interruption operating the voltage source converter apparatus after identification of a need for a DC side interruption based on a voltage order, so as to extract at least some electrical energy stored in the connected DC system to the voltage source converter apparatus.

Control of voltage source converters

A DC electrical network comprising DC terminals operatively connectable to a converter; and DC transmission paths arranged to interconnect the DC terminals, and including a DC power transmission medium and a switching apparatus. The DC network further including: an active power electronic device connected in at the DC transmission paths, the active power electronic device; a detector configured to detect faults in the DC transmission paths; and a control unit programmed to operate the active power electronic device to vary an apparent impedance of a faulty DC transmission path to force a current flowing in the faulty DC transmission path to reduce to a target current level, and operate the switching apparatus to block current from flowing in the faulty DC transmission path when the current flowing in the faulty corresponding DC transmission path is reduced to the target current level.

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Stone, United Kingdom

Carl David Barker