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US 12,341,345 B2Granted
Converter stations
AssigneeGE Vernova Infrastructure Technology LLC
InventorsMita Babu Narayanan, Jorge Miguel Goncalves
Life of this patent
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Abstract
A converter station, for a bipole power transmission scheme, includes a first voltage source converter and a second source converter. Each converters have a first terminal as transmission conduit and a second terminal as a return conduit. The second terminal of the return conduit of the first converter is electrically connected to the first terminal of the transmission conduit of the second converter as being a same terminal. Both voltage source converters also includes at least one converter limb which extends between the first and second terminals of each converters. The or each converter limb includes first and second limb portions that are separated by a corresponding first and second AC terminal which is for connection to a respective phase of a first or second AC network.
Claims8
A converter station, for a bipole power transmission scheme, comprising:
- a first voltage source converter having a first terminal for connection to a first transmission conduit, a second terminal for connection to a return conduit, and at least one converter limb extending between the first and second terminals, the or each converter limb including first and second limb portions separated by a corresponding first AC terminal for connection to a respective phase of a first AC network, the or each first limb portion including a first chain-link converter extending between the associated first AC terminal and the first terminal, the or each second limb portion including a second chain-link converter extending between the associated first AC terminal and the second terminal, and each chain-link converter including a plurality of series connected chain-link modules each having a plurality of switching elements connected in parallel with an energy storage device whereby each chain-link converter is controllable to provide a stepped variable voltage source;
- and
- a second voltage source converter having a third terminal for connection to a second transmission conduit, a fourth terminal for connection to the return conduit, and at least one converter limb extending between the third and fourth terminals, the or each converter limb including third and fourth limb portions separated by a corresponding second AC terminal for connection to a respective phase of a second AC network, the or each third limb portion including a third chain-link converter extending between the associated second AC terminal and the third terminal, the or each fourth limb portion including a fourth chain-link converter extending between the associated second AC terminal and the fourth terminal, and each chain-link converter including a plurality of series connected chain-link modules each having a plurality of switching elements connected in parallel with an energy storage device whereby each chain-link converter is controllable to provide a stepped variable voltage source,
- wherein the second terminal and the fourth terminal are electrically connected to one another,
- wherein each of the second and third chain-link converters consists of a first number of series-connected chain-link modules, and each of the first and fourth chain-link converters consists of a second number of series-connected chain-link modules, the second number being greater than the first number.
2 more elements
A method of operating a converter station comprising:
- a first voltage source converter having a first terminal connected to a first transmission conduit, a second terminal connected to a return conduit, and at least one converter limb extending between the first and second terminals, the or each converter limb including first and second limb portions separated by a corresponding first AC terminal connected to a respective phase of a first AC network, the or each first limb portion including a first chain-link converter extending between the associated first AC terminal and the first terminal, the or each second limb portion including a second chain-link converter extending between the associated first AC terminal and the second terminal, and each chain-link converter including a plurality of series connected chain-link modules each having a plurality of switching elements connected in parallel with an energy storage device whereby each chain-link converter is controllable to provide a stepped variable voltage source;
- and
- a second voltage source converter having a third terminal connected to a second transmission conduit, a fourth terminal for connection to the return conduit, and at least one converter limb extending between the third and fourth terminals, the or each converter limb including third and fourth limb portions separated by a corresponding second AC terminal connected to a respective phase of a second AC network, the third limb portion including a third chain-link converter extending between the associated second AC terminal and the third terminal, the fourth limb portion including a fourth chain-link converter extending between the associated second AC terminal and the fourth terminal, and each chain-link converter including a plurality of series connected chain-link modules each having a plurality of switching elements connected in parallel with an energy storage device whereby each chain-link converter is controllable to provide a stepped variable voltage source,
- wherein each of the second and third chain-link converters consists of a first number of series-connected chain-link modules;
- and
- each of the first and fourth chain-link converters consists of a second number of series-connected chain-link modules, the second number being greater than the first number.
3 more elements
Dependencies are inferred from the claim text.