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US 10,951,034 B2Granted
Protection for an HVDC network
AssigneesSupergrid Institute, Institut Polytechnique De Grenoble, Universite Grenoble Alpes
InventorsWilliam Leon Garcia, Alberto Bertinato, Bertrand Raison, Pascal Tixador, Bruno Luscan
Life of this patent
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Abstract
A method of protecting a high-voltage network comprising the steps for maintaining first controlled switches closed and second controlled switches open; measuring voltage and current on high-voltage interfaces; communicating the direction of the current to the other end of a high-voltage line; for each node: identifying a fault; verifying that the current is lower than the current interruption capability of the high-voltage interface switch and opening this switch.
Claims13
A method of protecting a high-voltage DC electrical network (1), the network comprising:
- high-voltage electrical lines (120,130, 230);
- three interconnection nodes (10, 20, 30) each comprising:
- a common network interface comprising at least two controlled switches and exhibiting respective current interruption capabilities, the common network interface being connected to other interconnection nodes via two high-voltage lines connected to its two respective controlled switches, such that each high-voltage line is connected between two controlled switches at its ends;
- a local network interface;
- three local networks, connected to a local network interface of a respective interconnection node (10, 20, 30), each local network comprising:
- an MMC converter (16, 26, 36);
- a protection circuit connected between this MMC converter and the local network interface of its interconnection node, the protection circuit comprising first and second branches connected in parallel, the first branch including a first controlled switch (14) and a first short-circuit current limiter (15), the second branch including a second controlled switch (12) and a second short-circuit current limiter (13);
- the method comprising the steps for:
- initially maintaining the said first controlled switches (14) closed and the said second controlled switches (12) open;
- measuring the voltage on and the current in each of the said controlled switches of the common network interface;
- for each of the said controlled switches connected to one end of a high-voltage line, communicating at least the direction of the current flowing through this controlled switch, or a command to open the controlled switch situated at the other end of the high-voltage line, to the interconnection node comprising the controlled switch connected to the other end of this high-voltage line;
- each interconnection node connected to a faulty high-voltage line:
- identifies a fault on this high-voltage line on the basis of the current and of the voltage measured for its controlled switch connected to this faulty high-voltage line and on the basis of the direction of the current communicated for the controlled switch connected to the other end of this faulty high-voltage line, or on the basis of a command to open its controlled switch, and
- verifies that the current flowing through its controlled switch connected to this faulty high-voltage line is lower than the current interruption capability of this controlled switch and controls the opening of this controlled switch;
- then
- for each of the MMC converters (16, 26, 36), it is verified that the voltage measured on a controlled switch of its common network interface has exceeded a verification threshold, then the second controlled switch of its protection circuit is closed.
13 more elements
A high-voltage DC electrical network (1), characterized in that it comprises:
- high-voltage electrical lines (120, 130, 230);
- three interconnection nodes (10, 20, 30) each comprising:
- a common network interface comprising at least two controlled switches and exhibiting respective current interruption capabilities, the common network interface being connected to other interconnection nodes via two high-voltage lines connected to its two respective controlled switches, such that each high-voltage line is connected between two controlled switches at its ends;
- a local network interface;
- three local networks, connected to a local network interface of a respective interconnection node (10, 20, 30), each local network comprising:
- an MMC converter (16, 26, 36);
- a protection circuit connected between this MMC converter and the local network interface of its interconnection node, the protection circuit comprising first and second branches connected in parallel, the first branch including a first controlled switch (14) and a first short-circuit current limiter (15), the second branch including a second controlled switch (12) and a second short-circuit current limiter (13);
- a control and monitoring circuit configured for:
- initially maintaining the said first controlled switches closed and the said second controlled switches open;
- measuring the voltage on and the current in each of the said controlled switches of the common network interface;
- for each of the said controlled switches connected to one end of a high-voltage line, communicating at least the direction of the current flowing through this controlled switch, or a command to open the controlled switch situated at the other end of the high-voltage line, to the interconnection node comprising the controlled switch connected to the other end of this high-voltage line;
- identifying a fault on this high-voltage line on the basis of the current and of the voltage measured for its controlled switch connected to this faulty high-voltage line and on the basis of the direction of the current communicated for the controlled switch connected to the other end of this faulty high-voltage line, or on the basis of a command to open its controlled switch, and
- verifying that the current flowing through its controlled switch connected to this faulty high-voltage line is lower than the current interruption capability of this controlled switch and controlling the opening of this controlled switch;
- then
- for each of the MMC converters (16, 26, 36), verifying that its voltage has exceeded a threshold and closing the second controlled switch of its protection circuit.
12 more elements
Dependencies are inferred from the claim text.