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1. (WO2015043602) DETECTING FAULTS IN ELECTRICITY GRIDS
Latest bibliographic data on file with the International Bureau   

Pub. No.: WO/2015/043602 International Application No.: PCT/DK2014/050289
Publication Date: 02.04.2015 International Filing Date: 17.09.2014
IPC:
H02H 3/24 (2006.01) ,F03D 7/02 (2006.01) ,H02H 7/26 (2006.01) ,H02J 3/12 (2006.01)
H ELECTRICITY
02
GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
H
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
3
Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection
24
responsive to undervoltage or no-voltage
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
03
MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
D
WIND MOTORS
7
Controlling wind motors
02
the wind motors having rotation axis substantially in wind direction
H ELECTRICITY
02
GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
H
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
7
Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
26
Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occurred
H ELECTRICITY
02
GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
J
CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
3
Circuit arrangements for ac mains or ac distribution networks
12
for adjusting voltage in ac networks by changing a characteristic of the network load
Applicants:
VESTAS WIND SYSTEMS A/S [DK/DK]; Hedeager 42 8200 Aarhus N, DK
Inventors:
HELLE, Lars; DK
TEODORESCU, Remus; DK
Priority Data:
PA 2013 7054030.09.2013DK
Title (EN) DETECTING FAULTS IN ELECTRICITY GRIDS
(FR) DÉTECTION DE PANNES DANS DES RÉSEAUX ÉLECTRIQUES
Abstract:
(EN) A wind turbine generator 1 is connected to a section 2 of an electricity grid 3 via a converter 4, which converts the ac output power from the generator into three-phase electric power at the voltage and frequency of the grid 3. The converter 4 comprises silicon carbide transistors which act as ON-OFF switches which are controlled so as to create a voltage profile which is the same as that of the grid voltage. Each grid section 2, 2' has a respective circuit breaker 10, 10' which disconnects the associated section from the remainder of the grid 3 in the event of an abnormally high current. The converter 2 includes a fault detector 11 arranged to detect grid faults, such as an abnormally low voltage level which, in response, generates an alarm signal which causes a high-level transient current to be supplied to the grid 3 sufficient to trip the circuit breaker 10' so as to disconnect the faulty section of the grid. By using silicon carbide transistors, which can withstand high operating temperatures, a higher-level current can be generated than would be the case with converters using conventional silicon transistors.
(FR) Un générateur éolien (1) est connecté à une section (2) d'un réseau électrique (3) via un convertisseur (4) qui convertit le courant de sortie CA du générateur en une énergie électrique triphasée à la tension et à la fréquence du réseau (3). Le convertisseur comprend des transistors au carbure de silicium agissant comme des commutateurs marche-arrêt qui sont commandés de manière à créer un profil de tension qui est identique à celui de la tension du réseau. Chaque section de réseau (2, 2') comprend un disjoncteur respectif (10, 10') qui déconnecte la section associée du reste du réseau (3) dans le cas d'un courant anormalement élevé. Le convertisseur (2) comprend un détecteur de panne (11) conçu pour détecter les pannes du réseau, telles qu'un niveau de tension anormalement bas, qui en réponse va générer un signal d'alarme entraînant l'envoi d'un courant transitoire de niveau élevé dans le réseau (3), lequel courant est suffisant pour déclencher le disjoncteur (10') afin de déconnecter la section défaillante du réseau. En utilisant des transistors au carbure de silicium, qui peuvent supporter des températures de fonctionnement élevées, il est possible de générer un courant d'un niveau plus élevé que dans le cas de convertisseurs utilisant des transistors au silicium traditionnels.
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)