General Electric Technology Gmbh

Ge Infrastructure Technology, LLC

John Lewis Outram

Colin Charnock Davidson

Jerome Gregoire

David Reginald Trainer

Stefan Schroeder

Carl David Barker

Robert Stephen Whitehouse

Stephen David Butler

Francisco Javier Chivite Zabalza

Colin Donald Murray Oates

Rajaseker Reddy Ginnareddy

Timothy James Stott

Konstantin Vershinin

Jonathan Christopher Nicholls

Francisco Jose Moreno Munoz

Javier Chivite-zabalza

Javier Francisco Chivite-Zabalza

Ikenna Bruce Efika

Francisco Javier Chivite-Zabalza

Francisco Jose Moreno Munzo

An electrical assembly includes a number of modules, each module including at least one module switching element and at least one energy storage device, each module switching element and each energy storage device in each module arranged to be combinable to provide a voltage source, each module including a discharge circuit with a discharge switching element and a discharge resistor, each discharge switching element switchable to switch the corresponding discharge resistor into and out of the corresponding module, wherein the electrical assembly includes a controller configured to control the discharge switching elements to modulate the switching of each discharge resistor into and out of the corresponding module in a voltage balancing mode when the modules are in a blocked state so that each module emulates a resistive load profile to balance a distribution of voltages between the modules, wherein the resistive load profile includes at least one positive resistive slope.

Electrical assembly for high voltage direct current transmission

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

The present disclosure relates to a voltage source converter (VSC) () comprising: a first MOSFET switching element () including a first body diode (); a second MOSFET switching element () including a second body diode (), the second MOSFET switching element () being connected in series with the first MOSFET switching element (); a protection device () connected in parallel with the second MOSFET switching element (); and a controller (), wherein the controller () is configured, on detection of an overcurrent event, to: switch off the first MOSFET switching element (); and switch off the second MOSFET switching element (), thereby forcing current flowing in the VSC () following the overcurrent event to flow through the second body diode () rather than through conducting channels of the first and second MOSFET switching elements ().

Voltage source converters

A switching apparatus () comprises first and second current paths, each current path configured to be capable of conducting an electrical current, the first current path including a first switching element () connected in parallel with a first passive current check element (), the switching apparatus () further including a switching controller configured to selectively control the switching of the first switching element (), wherein the switching controller is configured to selectively switch the first switching element () at a first intra-current path switching speed to commutate the electrical current between the first switching element () and the first passive current check element (), the switching controller is configured to selectively switch the first switching element () at a first inter-current path switching speed to commutate the electrical current between the first and second current paths, and the first intra-current path switching speed is faster or slower than the first inter-current path switching speed.

Switching apparatus

This application relates to a cell () or sub-module for a voltage source converter (). The cell includes an energy storage apparatus () and a plurality of dual-switch semiconductor packages (), each having first and second semiconductor switches () connected in series. The cell is operable in an active state in which an energy storage apparatus () is electrically connected in series between cell terminals () and a bypass state in the cell terminals () are electrically connected via a path that bypasses the first energy storage apparatus. The plurality of dual-switch semiconductor switch packages are configured to provide a first set of semiconductor switches () connected between nodes of the cell that are electrically connected in the first active state and electrically disconnected in the first bypass state; and a second set of semiconductor switches () is connected between nodes of the cell that are electrically disconnected in the first active state and electrically connected in the bypass state. The second set of switches comprises a greater number of switches in parallel than the first set of switches.

Voltage source converter apparatus

A method of controlling a voltage source converter including at least one converter limb, each converter limb including limb portions, at least one limb portion including a chain-link converter having modules, each module including at least one switching element and at least one energy storage device, which combine to selectively provide a voltage source, comprising the steps of: establishing during an operating cycle of the chain-link converter a utilization peak based on the actual peak number of modules providing a voltage source; establishing a target utilization based on a desired number of modules providing a voltage source during the operating cycle; and determining a control function based on a difference between the established utilization peak and the target utilization which alters the peak number of modules providing a voltage source during a subsequent operating cycle of the chain-link converter so as to drive the utilization peak towards the target utilization.

Systems, methods, and apparatus for controlling a voltage source converter

In the field of voltage assemblies with a charge storage capability for use in high voltage direct current converters there is provided a corona shield. The corona shield includes a peripheral frame which is formed from one or more frame members and within which lies a frame aperture. The corona shield also includes a barrier member that is fixedly secured to the peripheral frame. The barrier member extends across and occludes the frame aperture to inhibit bodily ingress through the frame aperture.

Corona shields

A power semiconductor module including a housing within which lies at least one semiconductor switching element. The housing includes a vent aperture that is selectively openable and closeable by a cooperating vent cover. The vent cover is held in an open position during normal operation of the power semiconductor module to open the vent aperture and provide ventilation for the or each semiconductor switching element within the housing. The vent cover is urged into a closed position by an increase in pressure within the housing resulting from an explosive event inside the housing to close the vent aperture and inhibit the escape of explosion gases and/or debris from the housing via the vent aperture

Relating to power semiconductor modules

Fault protection of a voltage source converter is provided. An apparatus has a chain-link circuit in series with a director switch. The chain-link circuit includes cells including an energy storage element and cell switching elements connected with anti-parallel diodes. Each cell switching element has a cell switching element controller. The director switch includes director switch units, each having a director switching element and a director switch unit controller. Each cell switching element controller monitors for a fault current and turns-off its associated cell switching element and reports a fault event to a fault controller. Each director switch unit controller monitors for a fault current and reports a fault event to the fault controller but the director switch unit control keeps its associated director switching element turned-on. The fault controller monitors for reports of fault events to order the cell switching elements of at least some of the cells to turn-off.

Fault protection for voltage source converters

An electrical bypass apparatus is provided, which comprises first and second terminals for connection across an electrical component; an electrically-triggered bypass switch being switchable to form a short circuit across the first and second terminals; and a first control circuit connected between the first and second terminals. The first control circuit includes mutually coupled first and second windings, the first winding being isolated from the second winding. The first control circuit is configured to inhibit a current flowing between the first and second terminals from flowing through the first winding when a normal operating voltage is present across the first and second terminals; and to permit a current to flow between the first and second terminals and through the first winding when an overvoltage is present across the first and second terminals and thereby induce a current pulse in the second winding.

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Stafford, United Kingdom

John Lewis Outram