WO2010060903A1 - Procédé et dispositif pour faciliter la localisation d’un défaut dans une grille - Google Patents

Procédé et dispositif pour faciliter la localisation d’un défaut dans une grille Download PDF

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Publication number
WO2010060903A1
WO2010060903A1 PCT/EP2009/065725 EP2009065725W WO2010060903A1 WO 2010060903 A1 WO2010060903 A1 WO 2010060903A1 EP 2009065725 W EP2009065725 W EP 2009065725W WO 2010060903 A1 WO2010060903 A1 WO 2010060903A1
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WO
WIPO (PCT)
Prior art keywords
grid
power
fault condition
determining
fault
Prior art date
Application number
PCT/EP2009/065725
Other languages
English (en)
Inventor
Jorge Martinez Garcia
Original Assignee
Vestas Wind Systems A/S
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vestas Wind Systems A/S filed Critical Vestas Wind Systems A/S
Publication of WO2010060903A1 publication Critical patent/WO2010060903A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
    • H02J3/0012—Contingency detection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—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
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Definitions

  • the technical field of the present invention is power systems. More specifically, the present invention relates to a method and device for facilitating the localization of a fault in an electrical grid.
  • Wind power technology is therefore an important field in that it is an environmental friendly and alternative way of generating and providing power to customers. For several reasons, such as the quality of power supplied to customers and to keep the power equipment of the grid intact, it is important to keep the grid free from faults to as large a degree as possible. It is, of course, not possible to keep the grid free from faults, and it is thereby very important for the grid operator to be able to localize a fault condition in the grid and, if necessary, disconnect a (preferably minimal) part of the grid subject to the fault condition.
  • a power converter In comparison to a generator directly coupled to the grid, a power converter has small transient response to a fault condition on the grid, i.e. the transient in this kind of Wind Turbine Generators (abbreviated WTG) with power converters will normally be shorter and with much less current into the grid. Therefore the WTG will not react in the same way as other type of WTGs, i.e. as directly coupled generators, do.
  • European laid open patent application EP1855367 discloses a method and device for injecting reactive current during a mains supply voltage dip, particularly for wind farms.
  • the magnitude and phase of the mains supply voltage is permanently monitored, and upon a voltage dip, a reactive current is injected in the affected mains supply phase or phases in a way that can vary over the duration of the voltage dip, at short intervals.
  • the current is proportional to the magnitude of the dip.
  • the method and device disclosed in EP1855367 injects current to follow the grid codes, i.e. to compensate for the voltage dip.
  • a method for facilitating the localization of a fault condition in a grid comprising: detecting, at a power plant comprising distributed power generators connected to said grid by means of power converters, the presence of the fault condition, determining a magnitude of at least one electrical parameter related to said fault condition, providing power to the grid by means of said power converters during a predetermined period of time, wherein said predetermined period of time and a magnitude of said power is based on the at least one electrical parameter.
  • a grid fault is to be construed as any kind of fault in the grid involving e.g.
  • a distributed power generator is defined as a power generator in renewable energy; in particular wind turbine generators of a wind farm, solar power generators, wave power generators or the like.
  • the present method may be used to provide power, e.g. fault currents to the fault, and thereby facilitating the localization of the fault condition in the grid.
  • the grid may comprise a plurality of grid nodes, said plurality of grid nodes being interconnected by means of grid protectors.
  • Grid protectors are in this context to be construed as relays and switches, which may disconnect parts of the grid e.g. by disconnecting a grid node.
  • the present method may thus facilitate for a grid operator and grid protectors to localize the fault condition, i.e. the grid node(s) that are affected by the fault condition may be localized.
  • the grid operator and/or grid protectors may, when having decided the severity of the grid fault, make a decision whether to disconnect a (preferably) minimal part of the grid, i.e. the affected grid node(s).
  • One embodiment may comprise detecting, by at least one grid protector of said grid protectors, an increase in power consumption in a faulty node connected to said grid protector, said detecting an increase in power consumption being in response to said providing power to the grid.
  • the detecting may comprises: determining a voltage level value outside a predetermined accepted voltage interval. wherein said determining a magnitude is based on said impedance value and said voltage value.
  • said determining at least one electrical parameter may further comprise: determining a grid impedance value associated with said voltage dip.
  • the providing may further comprise providing power from at least one central power converter of the power plant.
  • the central power converter of e.g. a substation of the power plant may provide additional power by means of e.g. storage devices such as batteries, traditional capacitors or super capacitors.
  • the power converters may comprise full-power converters.
  • Full-power converters may be utilized in variable-speed wind turbine generators, thereby becoming 'invisible' to the grid in the sense that their fast response to e.g. voltage dips in the grid provides for less fault currents to the grid during these voltage dips.
  • a full-power converter is to be construed as a converter being able to deliver the full power of a distributed power generator to the grid, i.e. the converter couples the full available power of the generator to the grid, in contrast to e.g. a Doubly Fed Induction Generator (abbreviated DFIG) WTG, where the stator of the generator is coupled to the grid directly, whereas the rotor is coupled via a power converter.
  • DFIG Doubly Fed Induction Generator
  • the present method may facilitate the localization of a grid fault by 'emulating' a generator being directly coupled to the grid, i.e. without being coupled via a power converter.
  • fault currents may be provided to the grid by means of power injections of the power converters connecting the distributed power generators of the power plant, thereby facilitating the fault localization in the grid.
  • the providing may comprise providing said power at the beginning of the fault condition.
  • the fault currents due to the power provided to the grid may be localized faster and a decision of e.g. disconnecting the faulty node(s) may be taken in a shorter time after the fault condition has arisen.
  • a decision of e.g. disconnecting the faulty node(s) may be taken in a shorter time after the fault condition has arisen.
  • damages to e.g. transformers and other power equipment in the grid may be reduced.
  • a power plant comprising: at least one distributed power generator comprising a power converter, at least one sensor for detecting a fault condition in a grid, and for determining a magnitude of at least one electrical parameter related to said fault condition, a processor for determining a magnitude of power to be provided to the grid, based on the magnitude of the at least one electrical parameter, wherein said power converter is arranged to provide the power into the grid in response to said fault condition being detected at the power plant.
  • each power converter may comprise a full-power converter.
  • One embodiment may comprise a central power converter being arranged to provide additional power into said grid simultaneously with said power converter.
  • the determining the at least one electrical parameter may comprise determining a grid impedance.
  • Each of the at least one distributed power generators may be coupled to a point of common coupling of said power plant by means of HVDC coupling.
  • HVDC coupling e.g. within a power plant, such as an offshore wind farm
  • the converters used for the AC/DC conversion may react in the same way as a full-power converter.
  • the inventive method and power plant as disclosed herein may provide power to the grid in case of e.g. a voltage dip on the grid, and thereby facilitate the localization the fault condition in the grid. Additional possible features and preferred embodiments are set out in the dependent claims and disclosed in the following. Brief Description of the Drawings
  • Fig. 1 shows a block diagram of a part of a grid comprising a wind farm according to an embodiment of the present invention.
  • Figs. 2a-b shows schematic views of variable-speed wind turbine generators.
  • Fig. 3 shows a graph of providing power into the grid when a fault condition occurs.
  • Figs 4-5 are flowcharts illustrating methods for facilitating the localization of a fault condition in the grid according embodiments of the present invention.
  • the present invention may relate to any kind of power plant utilizing power converters for grid connection.
  • the distributed power generators can e.g. be wind turbine generators, solar power generators, wave power generators and the like, but by way of example, a wind farm comprising wind turbine generators will be described with reference to Figs 1- 5 below.
  • Fig. 1 shows a block diagram of a part of a grid 1 comprising a wind farm 2 according to an embodiment of the present invention.
  • the part of the grid 1 in this illustrative example further comprises grid nodes N1 and N2 and grid protectors 3-1 , 3-2, and 3-3, which grid protectors may for instance be relays and switches, protecting the grid 1 as a whole by e.g. disconnecting a part of the grid 1 subject to a fault condition.
  • the wind farm 2 comprises two wind turbine generators 4-1 and 4-2 connected to a substation 5, comprising a central power converter 5', by means of respective power converters (9 in Figs 2a-b), which in turn connects the wind farm 1 to the grid 1 by means of a point of common coupling (abbreviated PCC) 6.
  • PCC common coupling
  • the PCC 6 may be comprised within e.g. the substation 5 in some embodiments of the invention.
  • the wind turbine generators 4-1 and 4-2 may be directly coupled to the central power converter 5', i.e. without coupling via power converters 9 between the central power converter 5' and the WTGs 4-1 and 4-2.
  • the PCC 6 may comprise a Static Synchronous
  • a single wind turbine generator 4-1 in the grid 1 may also provide at least some of the advantages described below relating to the wind farm 2.
  • the sensor 8 can detect a fault condition in the grid 1.
  • a grid fault can in this respect e.g. be a voltage dip in the grid 1 , or an overvoltage condition depending on e.g. short circuit between phases, or phase(s) to ground short circuits, or a generator fault at a power plant (not shown).
  • the sensor 8 may detect a fault condition of each phase separately, i.e. the sensor 8 may be able to detect asymmetrical faults of the three phases in the grid 1.
  • the detection of the fault condition in the grid 1 may comprise detecting a change in grid characteristics, such as a voltage level change of the grid 1. Sensors as described above are well-known in the art and will therefore not be described in more detail herein.
  • the processor 7 may receive signals from the sensor 8, comprising information relating to detection of the grid fault. The processor 7 may then determine a magnitude of power, e.g. reactive current, to be provided to the grid 1. Control equipment (not shown) of the wind turbine generators 4-1 and 4-2 may then receive signals with instructions to provide an additional power injection into the grid 1 from the wind turbine generators 4-1 and 4-2. The respective power converters of the wind turbine generators may then provide a power injection to the grid 1 , for instance the injection of reactive current, with a magnitude determined by the processor 7. It is to be noted that the sensor 8 and the processor 7 may in an embodiment be situated in the wind turbine generators 4-1 and 4-2, as well as in the PCC 6.
  • the determining a magnitude of power may be achieved individually at a wind turbine generator level, i.e. a processor of each wind turbine generator 4-1 and 4-2 may determine the magnitude of power to be provided to the grid 1 from each individual WTG 4-1 , 4-2.
  • This inventive method may thus facilitate the localization of a grid fault in that the wind farm 2 is involved in providing a fault current to the grid 1 , instead of being 'invisible' to the grid 1 , behind power converters of the wind turbine generators 4-1 and 4-2. More specifically, this emulation of a generator directly connected to the grid facilitate the localization of the grid fault in the grid 1 by providing power to the faulty part of the grid, wherein e.g. the increased currents present in the faulty part of the grid facilitates for a grid operator to localize and make a decision whether to disconnect the faulty part of the grid 1 or not.
  • Figs. 2a-b shows schematic views of variable-speed wind turbine generators 4.
  • the wind turbine generator 4 shown in Fig. 2a illustrates a variable speed wind turbine generator 4 comprising a power converter 9 of full power type, i.e. all of the nominal power of the generator is transmitted via the power converter 9 to the grid 1.
  • the power converter 9 comprises a back-to- back converter: an AC/DC converter 9-1 , a DC/AC converter 9-2, and a DC bus capacitor 9-3.
  • the AC/DC converter 9-1 and the DC/AC converter 9-2 may be of a standard voltage source converter type with transistors, such an IGBT, GTO or other type of electronics switch.
  • the power electronics inside the power converter 9-1 inter alia controls the generator 10 speed.
  • the generator can be of either synchronous or asynchronous (induction generator) type. Whereas the power electronics inside the power converter 9-2 inter alia controls the flow of power to the grid, both reactive and active power.
  • a gear box 11 may be arranged between the generator and the shaft of the wind turbine but is however not necessary for the construction of the wind turbine generator 4, and may be omitted, as a skilled person will readily understand, e.g. depending on the number of poles if the generator 10 is of synchronous type.
  • the wind turbine generator 4 is preferably connected to the grid via transformer 12.
  • the wind turbine generator 4 exemplified in Fig. 2a is a typical wind turbine generator that is 'invisible' to the grid 1 in that the generator 10 is not directly connected to the grid 1 in the sense that the (full) power converter 9 is the actual point of connection with the grid 1 (or generally, with substation 5).
  • a fault condition such as a voltage dip
  • the localization of the fault condition may be facilitated and thereby damage to electrical equipment of the grid 1 , e.g. transformers, may be prevented.
  • the wind turbine generator 4 shown in Fig. 2b illustrates a wind turbine generator of doubly fed induction generator-type (DFIG-type).
  • DFIG-type doubly fed induction generator-type
  • Wind turbine generators of DFIG-type have some well known advantages with respect to the above described full power converter type of wind turbine generators, such as reduced losses due to thermal heating of the power converter 9.
  • DFIG-type wind turbine generators may still exhibit some of the disadvantages of the full converter type of wind turbine generators, relating to the contribution of fault currents when the grid 1 is subject to a fault condition. Therefore, it may preferable to be able to provide a power injection into the grid in case of a fault condition even for wind turbine generators of DFIG-type.
  • An example of a situation with a fault condition in the grid 1 will now be described with reference to Figs 1 and 3.
  • a fault condition - a generator fault in grid node N2 has occurred, giving rise to a voltage dip in the part of the grid 1 illustrated in Fig. 1.
  • a voltage dip occurs in the grid 1 , and thereby the (automatic) response from generators of a power plant (not shown) in grid node N1 is to inject a reactive current into the grid 1 in order to regulate the voltage in the grid 1.
  • Such action facilitates the localization of the fault in grid node N2, e.g.
  • grid protectors 3-1 , 3-1 , and 3-3 may detect a raised current level and in case of a major fault, the grid protector 3-1 may disconnect grid node N2 from the rest of the grid 1 until the problem that has occurred in grid node N2 has been resolved.
  • the generators 10 of the wind farm 2 have been arranged behind fast responding (i.e. fast shut down) power converters and hence 'invisible' to the grid 1 , and therefore, a power injection, i.e. the provision of power would not have been possible. Thereby only low currents from the wind farm 2 may have been provided to the fault, and fault detection would have rendered more difficult.
  • utilization of the inherent properties of the power converter 9, i.e. its fast response and capability to overload emulation of a generator that is directly connected to the grid 1 is possible.
  • a transient will occur as a natural response from the power converter 9.
  • a magnitude of reactive power e.g. a current injection, to be provided to the grid is determined by the processor 7.
  • reactive power is provided to the grid 1.
  • the reactive current is N times greater than a nominal current I n .
  • the injected current will decay following a programmed curve (e.g. linearly or exponentially, using typical synchronous time constants) as the power converter 9 normally will not be able to deliver the high current constantly.
  • the power converter 9 may in an embodiment keep providing power to the grid 1 according to a grid code that applies.
  • the central power converter 5' located in the substation 5 may be utilized to provide additional power to the grid 1 , if the power converters 9 of the wind turbine generators 4-1 and 4-2 are unable to provide enough power to the fault in the grid 1.
  • the additional power provided to the grid 1 from the central converter 5' may be provided by means of e.g. storage devices such as batteries, traditional capacitors or super capacitors.
  • the STATCOM may be utilized to provide additional power to the grid 1.
  • the maximal available reactive power decreases more slowly when there is a grid voltage dip than for some other type of compensators such as Static Var Compensators (abbreviated SVC).
  • SVC Static Var Compensators
  • sensor 8 may, when a fault has been detected, e.g. when a voltage level falling below a predetermined threshold has been detected e.g. at the PCC 6, determine at least one electrical parameter related to the fault condition.
  • a fault condition can be detected by determining a voltage level value, at e.g. the PCC 6, outside a predetermined accepted voltage interval.
  • the determining of the at least one electrical parameter may comprise guessing a grid impedance, and thereby determining the value of the peak current to be provided to the grid 1 according to the level of voltage at the PCC 6.
  • a ratio between the peak current to be provided to the grid 1 and the voltage level at the PCC 6 can e.g. be determined on basis of previous estimation values, knowing the structure of the grid where the system is connected, can be determined or simulated the distance to the fault when different voltages levels are present at the PCC 6.
  • the power to be provided i.e. the current to be injected into the grid 1
  • the power to be provided can be determined as a function of the grid impedance to the fault.
  • an equivalent impedance of the grid 1 may be determined using real time fault location information, utilizing techniques known in the art (e.g. by injecting a disturbance to the grid and analyzing the transient response) to determine the impedance of the grid in every moment.
  • typical transient impedances of synchronous machines in combination with the grid impedance may be used to determine the power (by e.g. Ohm's law) to be provided to the grid 1.
  • Figs 4-5 are flowcharts illustrating methods for facilitating the localization of a fault condition in the grid according to embodiments of the present invention.
  • a step S1 the presence of the grid fault condition is detected.
  • the detection may be at the wind farm 2.
  • the fault is to be construed to have arisen in another part of the grid 1 than the wind farm 2.
  • the detection may be carried out by the sensor 8 as has been described in more detail above.
  • the detection may comprise detecting changes, above or below a predetermined threshold of grid characteristics, and thereby alerting the processor 7 that a fault condition has been detected.
  • changes in grid characteristics which the sensor 8 may sense may be changes in the voltage level in the grid 1.
  • the detection can comprise determining a voltage level value outside a predetermined accepted voltage interval of the grid 1.
  • a magnitude of at least one electrical parameter is determined.
  • a magnitude of reactive power e.g. current
  • the electrical parameter to be determined may be grid impedance.
  • the magnitude of power to be provided to the grid 1 may be determined. This is illustrated in a step S2'.
  • a power value associated with the voltage value can be determined by e.g. comparing in a table the voltage value with usual grid impedances for that voltage value.
  • Such a table may be based on e.g. the power converter 9 capabilities.
  • the table may comprise injecting a maximum current (power) of the power converters 9 capacity (in one embodiment, the table may be adapted to take the central converters' 5' available power output into account); 100% of maximum current for zero voltage, 90% of maximum current injection for 10 % voltage, i.e. for a 90% voltage dip, etc.
  • the determining of the at least one electrical parameter may comprise guessing a grid impedance, and thereby determining the value of the peak current to be provided to the grid 1 according to the level of voltage at the PCC 6.
  • the power to be provided i.e. the current to be injected into the grid 1
  • the power to be provided can be determined as a function of the grid impedance to the fault.
  • an equivalent impedance of the grid 1 may be determined using real time fault location information, utilizing techniques known in the art (e.g. by injecting a disturbance to the grid and analyzing the transient response) to determine the impedance of the grid in every moment.
  • typical transient impedances of synchronous machines in combination with the grid impedance may be used to determine the power (by e.g. Ohm's law) to be provided to the grid 1.
  • a step S3 the power is provided to the grid 1.
  • the power is provided by the wind turbine generators providing power to the power converter s 9, and if necessarry, overloading their power converters 9.
  • the central power converter 5' of the substation 5 of the wind farm 2 may provide additional power into the grid, if the power converters 9 of wind turbine generators 4-1 and 4-2 are not able to provide enough power into the grid 1.
  • the STATCOM may provide additional power to the grid
  • grid protectors 3-1 , 3-2, and 3-3 may be able to detect the additional power (i.e. a reactive current injection) provided to the grid giving rise to fault currents detectable by the grid protectors 3-1 , 3-2 and 3-3. Hence a decision may be taken whether to disconnect nodes with fault in the grid 1.
  • additional power i.e. a reactive current injection
  • the algorithms above disclose in detail how to determine the magnitude of power to be provided to the grid.
  • the algorithms above may also include rules for setting the protection settings of the grid protectors.
  • the algorithms comprises rules by which the grid protectors react to the additional power provided to the grid and disconnect the nodes with faults without receiving instructions from the PCC 6.
  • the algorithms comprise rules based on the operational status of the grid protectors, which are supervised or monitored by the PCC 6.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

La présente invention concerne un procédé pour faciliter la localisation de défauts dans une grille électrique (1). Lorsqu’un état défectueux de la grille (1) est détecté dans une usine de production d’électricité (2), les convertisseurs de courant (9) des générateurs de courant distribué (4, 4-1, 4-2) de l’usine de production d’électricité (2) sont utilisés pour injecter du courant dans la grille (1). L’amplitude de l’injection de courant dépend de l’état du défaut. La présente invention concerne également une usine de production d’électricité (2).
PCT/EP2009/065725 2008-11-28 2009-11-24 Procédé et dispositif pour faciliter la localisation d’un défaut dans une grille WO2010060903A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DKPA200801680 2008-11-28
DKPA200801680 2008-11-28
US11873708P 2008-12-01 2008-12-01
US61/118,737 2008-12-01

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WO2010060903A1 true WO2010060903A1 (fr) 2010-06-03

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US20070273155A1 (en) * 2004-03-12 2007-11-29 Werner Barton Method for operating a frequency converter of a generator and wind energy turbine having a generator operated according to the method
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EP1855367A1 (fr) * 2005-02-23 2007-11-14 Gamesa Innovation & Technology, S.L. Procede et dispositif d'injection d'intensite reactive pendant un creux de tension de reseau
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