WO2024067935A1 - Procédé de réduction de charge dans des éoliennes - Google Patents

Procédé de réduction de charge dans des éoliennes Download PDF

Info

Publication number
WO2024067935A1
WO2024067935A1 PCT/DK2023/050233 DK2023050233W WO2024067935A1 WO 2024067935 A1 WO2024067935 A1 WO 2024067935A1 DK 2023050233 W DK2023050233 W DK 2023050233W WO 2024067935 A1 WO2024067935 A1 WO 2024067935A1
Authority
WO
WIPO (PCT)
Prior art keywords
auxiliary
wind turbine
auxiliary electrical
undervoltage
electrical loads
Prior art date
Application number
PCT/DK2023/050233
Other languages
English (en)
Inventor
Morten Bagger SØGAARD
Waseem AHMED SHAIK
Alun Jones
Balaji P M
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 WO2024067935A1 publication Critical patent/WO2024067935A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/003—Power-supply to auxiliary components, e.g. to pitch drives or cooling fans
    • 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
    • H02J11/00—Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/028—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power
    • F03D7/0284—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power in relation to the state of the electric grid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/10—Purpose of the control system
    • F05B2270/107—Purpose of the control system to cope with emergencies
    • F05B2270/1071—Purpose of the control system to cope with emergencies in particular sudden load loss
    • F05B2270/10711—Purpose of the control system to cope with emergencies in particular sudden load loss applying a low voltage ride through method
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/30—Control parameters, e.g. input parameters
    • F05B2270/337—Electrical grid status parameters, e.g. voltage, frequency or power demand
    • 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
    • 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • 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

Definitions

  • the present invention relates to a load reduction method and a wind turbine load reduction system adapted to reduce loads in an auxiliary system of the wind turbine during undervoltage events, such as long term undervoltage events.
  • VFDs variable frequency drives
  • the current increase in the auxiliary systems is disadvantageous in that it increases the voltage drops across one or more auxiliary electrical components in the auxiliary systems which may lead to tripping of auxiliary electrical components eventually causing the entire wind turbine to trip. In offshore wind power plants this is very problematic as also entire wind power plant may trip at once.
  • Increased currents in auxiliary systems of wind turbine may, in general, be complied with by using larger auxiliary electrical components, thicker cables, larger motors etc.
  • this approach is disadvantageous since it is very expensive to implement.
  • the above-mentioned object is complied with by providing, in a first aspect, a method for operating a wind turbine during an undervoltage event where a grid voltage drops to an undervoltage value, wherein the wind turbine comprises a generator being operatively connected to a power grid, an auxiliary system comprising one or more auxiliary electrical components and one or more auxiliary electrical loads, an auxiliary transformer being operatively connected on a primary side to the generator and to the power grid, and being operatively connected on a secondary side to the auxiliary system, and a load controller being arranged to reduce one or more auxiliary electrical loads in the auxiliary system in response to a detected undervoltage event, the method comprising the steps of
  • the present invention relates, in a first aspect, to a method for preventing that one or more auxiliary electrical components of a wind turbine, or an entire wind turbine, trips during an undervoltage event where the wind turbine is expected to remain connected to the power grid, such as to support power grid with reactive power.
  • an undervoltage event may have occurred when the grid voltage has dropped to for example 0.85-0.90 pu for a certain period of time, such as 0.87 for one 1 hour. It should be noted that the voltage range may be different from 0.85-0.90 pu, and it may be dictated by grid codes at the site of the wind turbine.
  • a power grid voltage of 0.85 pu corresponds to 85% of the nominal power grid voltage, i.e. the power grid voltage at normal operating conditions. Normal operating conditions may be considered to have been reached when the power grid voltage exceeds 0.90 pu.
  • the generator of the wind turbine may be driven by a set of rotatably mounted rotor blades which may be pitched in and out of the wind depending on the operating conditions, such as the wind speed.
  • a gearbox may be inserted between the rotor blades and the generator which may have a nominal power of up to 15 MW.
  • the generator may provide power to the power grid via a power converter, such as a full-scale power converter.
  • the one or more auxiliary electrical components of the wind turbine's auxiliary system may be responsible for handling one or more auxiliary functions performed by the wind turbine.
  • the one or more auxiliary electrical components may perform functions such as yawing, pitching, heating, control of hydraulic systems, etc.
  • the one or more auxiliary electrical loads may be responsible for various cooling functions, such as cooling the generator, the power converter, the gearbox, the one or more auxiliary electrical components etc.
  • the one or more auxiliary electrical loads may each comprise a VFD, an electric motor and a cooling fan secured to the shaft of the electric motor. The speed of rotation of the electric motors depends on the frequency provided by the respective VFDs - the higher the frequency the higher the speed of rotation of the electric motors.
  • the load caused by the one or more auxiliary electrical loads may be reduced by lowering the operating frequency provided by the VFDs as this reduces the speed of rotation of the electric motors.
  • the load controller may be arranged to lower the speed rotation of one or more electric motors thereby preventing tripping of one or more auxiliary electrical components of the wind turbine, or tripping of the entire wind turbine.
  • the undervoltage event may be detected via one or more measurements of the voltage of the power grid, or via measurement of one or more local voltages in the auxiliary system of the wind turbine.
  • the power grid voltage may be measured as a single point measurement (single or multiphase) on the primary side of the auxiliary transformer.
  • one or more local voltages may be measured in the auxiliary system of the wind turbine, i.e. on the secondary side of the auxiliary transformer.
  • the one or more local voltages in the auxiliary system may be measured at (or near) the one or more auxiliary electrical components and/or at (or near) the one or more auxiliary electrical loads.
  • the winding ratio of a potential grid transformer may be taking into consideration when determining the power grid voltage.
  • the power grid voltage is determined via one or more local voltage measurements on the secondary side of the auxiliary transformer the winding ratio of both a potential grid transformer and the auxiliary transformer may be taking into consideration when determining the power grid voltage.
  • the one or more auxiliary electrical loads of the auxiliary system may comprise one or more VFDs arranged to control the speed of rotation of electric motors, i.e. the speed of rotation of cooling fans for cooling the generator, the power converter, the gearbox, the one or more auxiliary electrical components etc.
  • the method may comprise the step of reducing one or more speed references to the VFDs.
  • the reduced one or more speed references may be different (if more than two speed references) and they may be provided to selected and/or prioritised VFDs.
  • the reduced one or more speed references to the respective VFDs may be determined and dispatched by the load controller.
  • Whether a VFD is selected and/or prioritised may relate to its function in the wind turbine.
  • a VFD that is involved in cooling the generator may be considered more important and thus prioritized over a VFD that is involved in cooling for example the yawing system.
  • all speed references to all VFDs may be reduced with the same value in response to a detected undervoltage event. This approach is advantageous due to its relative simple implementation.
  • the speed references to the VFDs may be reduced by reducing an operating frequency of the VFDs with up to 20% which may lead to a power reduction in the range of 50-75% depending on the load type connected to the VFD and the size of the load.
  • the method according to the first aspect may further comprise the step of reducing, using the load controller, one or more auxiliary electrical loads in the auxiliary system in response to additional parameters, such as the site of the wind turbine and/or a measured or predetermined ambient temperature.
  • additional parameters such as the site of the wind turbine and/or a measured or predetermined ambient temperature.
  • other parameters may be decisive for reducing the load caused by one or more auxiliary electrical loads. For example, if the site of the wind turbine or wind power plant is known to have notoriously low ambient temperatures the amount of cooling provided to for example the generator and the power converter may be reduced beforehand. If an undervoltage event is then detected an even further reduced cooling of the generator and the power converter might not be needed.
  • the method may further comprise the step of terminating the reduced load operation of the one or more auxiliary electrical loads in the auxiliary system when the undervoltage event has terminated.
  • the undervoltage event has terminated the operating conditions of the wind turbine may return to normal.
  • the present invention relates to a wind turbine comprising
  • a generator being operatively connected to a power grid
  • an auxiliary system comprising one or more auxiliary electrical components and one or more auxiliary electrical loads
  • an auxiliary transformer being operatively connected on a primary side to the generator and to the power grid, and being operatively connected on a secondary side to the auxiliary system
  • the wind turbine further comprises a load controller arranged to reduce one or more auxiliary electrical loads in the auxiliary system in response to a detected undervoltage event where the grid voltage drops to an undervoltage value.
  • the present invention relates, in a second aspect, to a wind turbine capable of performing the method of the first aspect, i.e. performing, using the load controller, a method for preventing that one or more auxiliary electrical components of the wind turbine, or the entire wind turbine, trips during an undervoltage event where the wind turbine is expected to remain connected to the power grid, such as to support power grid with reactive power.
  • an undervoltage event may have occurred when the grid voltage has dropped to for example 0.85-0.90 pu for a certain period of time, such as 0.87 pu for 1 hour.
  • the voltage range may be different from 0.85-0.90 pu, and the voltage range may be dictated by grid codes at the site of the wind turbine.
  • a power grid voltage of 0.85 pu corresponds to 85% of the nominal power grid voltage, i.e. the power grid voltage at normal operating conditions. Again, normal operating conditions may be considered to have been reached when the power grid voltage exceeds 0.90 pu.
  • the generator of the wind turbine may be driven by a set of rotatably mounted rotor blades which may be pitched in and out of the wind depending on the operating conditions, such as the wind speed.
  • a gearbox may be inserted between the rotor blades and the generator which may have a nominal power of up to 15 MW.
  • the generator may provide power to the power grid via a power converter, such as a full-scale power converter.
  • the site of the wind turbine may be either onshore or offshore, and the wind turbine may form part of the wind power plant.
  • the one or more auxiliary electrical components of the wind turbine's auxiliary system may be responsible for handling one or more auxiliary functions performed by the wind turbine.
  • the one or more auxiliary electrical components may perform functions such as yawing, pitching, heating, control of hydraulic systems, etc.
  • the one or more auxiliary electrical loads may be responsible for various cooling functions, such as cooling the generator, the power converter, the gearbox, the one or more auxiliary electrical components etc.
  • the one or more auxiliary electrical loads may each comprise a VFD, an electric motor and a cooling fan secured to the shaft of the electrical motor.
  • the speed of rotation of the electric motors depends on the frequency provided by the respective VFDs - the higher the frequency the higher the speed of rotation of the electric motors.
  • the load caused by the one or more auxiliary electrical loads may be reduced by lowering the operating frequency provided by the VFDs as this reduces the speed of rotation of the electric motors.
  • the load controller may be arranged to lower the speed rotation of one or more electric motors thereby preventing tripping of one or more auxiliary electrical components of the wind turbine, or tripping of the entire wind turbine.
  • the load controller may form part of a controller of the wind turbine, such as part of a main controller of the wind turbine.
  • the load controller may be arranged to detect an undervoltage event via one or more measurements of the voltage of the power grid, or via measurement of one or more local voltages in the auxiliary system of the wind turbine.
  • the power grid voltage may be measured as a single point measurement (single or multiphase) on the primary side of the auxiliary transformer.
  • one or more local voltages may be measured in the auxiliary system of the wind turbine, i.e. on the secondary side of the auxiliary transformer.
  • the one or more local voltages in the auxiliary system may be measured at (or near) the one or more auxiliary electrical components and/or at (or near) the one or more auxiliary electrical loads.
  • the winding ratio of a potential grid transformer may be taking into consideration when determining the power grid voltage.
  • the power grid voltage is determined via one or more voltage measurements on the secondary side of the auxiliary transformer the winding ratio of both a potential grid transformer and the auxiliary transformer may be taking into consideration when determining the power grid voltage.
  • the one or more auxiliary electrical loads of the auxiliary system may comprise one or more VFDs arranged to control the speed of rotation of electric motors, i.e. the speed of rotation of cooling fans for cooling the generator, the power converter, the gearbox, the one or more auxiliary electrical components etc.
  • the load controller may reduce one or more speed references to the VFDs.
  • the reduced one or more speed references may be different (if there are more than two speed references) and they may be provided to selected and/or prioritised VFDs.
  • the reduced one or more speed references to the respective VFDs may be determined and dispatched by the load controller.
  • Whether a VFD is selected and/or prioritised may relate to its function in the wind turbine.
  • a VFD that is involved in cooling the generator may be considered more important and thus prioritized over a VFD that is involved in cooling for example the yawing system.
  • all speed references to all VFDs from the load controller may be reduced with the same value in response to a detected undervoltage event. This approach is advantageous due to its simple implementation.
  • the speed references to the VFDs from the load controller may be reduced by reducing an operating frequency of the VFDs with up to 20% which may lead to a power reduction in the range of 50-75% depending on the load type connected to the VFD and the size of the load.
  • the load controller may furthermore be arranged to reduce the one or more auxiliary electrical loads in the auxiliary system in response to additional parameters, such as the site of the wind turbine and/or a measured or predetermined ambient temperature.
  • additional parameters such as the site of the wind turbine and/or a measured or predetermined ambient temperature.
  • other parameters may be decisive for reducing the load caused by one or more auxiliary electrical loads. For example, if the site of the wind turbine or wind power plant is known to have notoriously low ambient temperatures this may be stored in the load controller, and the amount of cooling provided to for example the generator and the power converter may be reduced beforehand. If an undervoltage event is then detected an even further reduced cooling of the generator and the power converter might not be needed.
  • the load controller may moreover be arranged to terminate the reduced load operation of the one or more auxiliary electrical loads in the auxiliary system when the undervoltage event has terminated.
  • the load controller may moreover be arranged to terminate the reduced load operation of the one or more auxiliary electrical loads in the auxiliary system when the undervoltage event has terminated.
  • the present invention relates to a wind power plant comprising one or more wind turbines according to the second aspect.
  • a wind power plant may be seen as a group of typically tens or hundreds of wind turbines with a point of common coupling (PCC) to an external power grid.
  • the wind power plant may be either onshore or offshore, or even a combination thereof.
  • FIG. 1 shows a schematic block diagram of a wind turbine
  • Fig. 2 show a flow chart of the method of the present invention.
  • the present invention relates to a method for reducing the load in an auxiliary system of wind turbine during undervoltage events, such as long term undervoltage events, as well as a wind turbine capable of performing this load reduction method.
  • the method and wind turbine according to the present invention are thus adapted to reduce loads in an auxiliary system of the wind turbine during undervoltage events, and thus avoid that the wind turbine potentially trips due to increased currents and associated increased voltage drops across auxiliary electrical components in the auxiliary system of the wind turbine.
  • Fig. 1 shows a single line diagram of a wind turbine 1 according to an embodiment of the present invention.
  • the wind turbine 1 comprises a power generator 2 being electrically connected to a power grid 3 via a transformer 9 and a power converter 10.
  • the generator 2 and the power grid 3 are electrically connected on a primary side of an auxiliary transformer 7.
  • the auxiliary transformer 7 is on a secondary side electrically connected to an auxiliary system 4 which comprises one or more auxiliary electrical components 5, 5', 5" and one or more auxiliary electrical loads 6, 6', 6".
  • the one or more auxiliary electrical components 5, 5', 5" and one or more auxiliary electrical loads 6, 6', 6" in Fig. 1 are depicted as AC devices they may, alternatively, also involve DC devices, such as DC motors in combination with appropriate drive arrangements.
  • the generator 2 of the wind turbine 1 is typically driven by a set of rotatably mounted rotor blades (not shown) which may be pitched in and out of the wind depending on the operating conditions, such as the wind speed.
  • a gearbox (also not shown) may be inserted between the rotor blades and the generator 2.
  • the generator 2 and the power converter 10, which may be a full-scale power converter, may have a nominal power of up to 15 MW delivered via three phases.
  • the one or more auxiliary electrical components 5, 5', 5" may be responsible for handling one or more auxiliary functions performed by the wind turbine 1, such as yawing, pitching, heating, control of hydraulic systems, etc.
  • the one or more auxiliary electrical loads 6, 6', 6" may for example handle various cooling functions, such as cooling the generator 2, the converter 10, a gearbox, the one or more auxiliary electrical components 5, 5', 5" etc.
  • the one or more auxiliary electrical loads 6, 6', 6" may each comprise a VFD, an electric motor and a cooling fan secured to a shaft of the electric motor. The operating frequency of the VFD controls the rotational speed of the electric motor and thus the cooling capability.
  • the wind turbine 1 may be arranged to comply with modern grid codes. This may imply for example that the wind turbine 1 should be adapted to remain electrically connected to the power grid 3 during an undervoltage event where the power grid voltage may drop to for example 0.85 pu over a longer period of time.
  • the term "a longer period of time" may, according to some grid codes, be up to 1 hour.
  • a power grid voltage of 0.85 pu corresponds to a grid voltage level of 85% of the nominal grid voltage, i.e. the grid voltage at normal operating conditions.
  • the currents in the auxiliary system 4 inevitably increase if the loads caused by the one or more auxiliary electrical loads 6, 6', 6" remain constant.
  • the current increase in the auxiliary system 4 causes the voltage drops across the one or more auxiliary electrical components 5, 5', 5" to increase due to for example the associated internal resistances, and these increased voltage drops may lead to tripping and thus malfunctioning of one or more auxiliary electrical components 5, 5', 5". Tripping of one or more auxiliary electrical components 5, 5', 5" should be avoided as it may potentially lead to tripping of the entire wind turbine 1.
  • the wind turbine 1 comprises a load controller 8 which may form part of a controller, such as a main controller, of the wind turbine 1.
  • the load controller 8 may be arranged to reduce the load caused by one or more auxiliary electrical loads 6, 6', 6" in the auxiliary system 4 in response to a detected undervoltage event.
  • the load controller 8 may be arranged to detect an undervoltage event via a measurement of the power grid voltage on the primary side of the auxiliary transformer 7. If the power grid voltage is determined via a voltage measurement on the primary side of the auxiliary transformer 7 the winding ratio of the grid transformer 9 may be taking into consideration when determining the power grid voltage.
  • the load controller 8 may be arranged to detect an undervoltage event via measurement of one or more local voltages in the auxiliary system 4, such as one or more local voltages at the one or more auxiliary electrical components 5, 5', 5" and/or at the one or more auxiliary electrical loads 6, 6', 6". If the power grid voltage is determined via one or more local voltage measurements on the secondary side of the auxiliary transformer 7, i.e. in the auxiliary system 4, the winding ratio of both the grid transformer 9 and the auxiliary transformer 7 may be taking into consideration when determining the power grid voltage.
  • the load controller 8 may be arranged to reduce one or more speed references to the respective VFDs in the one or more auxiliary electrical loads 6, 6', 6".
  • the one or more speed references is/are reduced by lowering the operating frequency of one or more VFDs and thus lowering the speed of rotation of electric motors driven by the VFDs.
  • the reduced speed references may be provided to selected and/or prioritised VFDs, and the provided speed references may be different. Whether a VFD is considered selected and/or prioritised may relate to its function in the wind turbine. For example, a VFD that is involved in cooling the generator 2 may be considered more important and thus prioritized over a VFD that is involved in cooling for example the yawing system.
  • the load controller 8 may be arranged to reduce all speed references to all VFDs with the same value in order to simplify the control scheme.
  • the load controller 8 may be arranged to reduce speed references to the VFDs by reducing an operating frequency of the VFDs with up to 20%.
  • the speed references to the respective VFDs can also return to their normal, i.e. non-reduced, values.
  • the wind turbine 1 can, in a safe manner, remain connected to the power grid 3 during undervoltage events without the risk of tripping, and without requiring service personnel to access the wind turbine 1.
  • Fig. 2 shows a flow chart illustrating a method according to an embodiment of the present invention. The method is initiated in step 11, in which a wind turbine is operated at normal operating conditions.
  • step 12 it is established whether an undervoltage event has occurred or not. In case the grid voltage has not dropped to an undervoltage value, the wind turbine continues to operate at normal operating conditions.
  • step 12 reveals that the grid voltage has dropped to an undervoltage value, this indicates that an undervoltage event has occurred.
  • the undervoltage value may be in the range 0.85-0.90 pu which corresponds to 85- 90% of the nominal grid voltage.
  • the undervoltage event may be detected via one or more measurements of the power grid voltage, or via measurements of one or more local voltages in the auxiliary system 4, cf.
  • Fig. 1 such as one or more local voltages measured at the one or more auxiliary electrical components and/or at the one or more auxiliary electrical loads.
  • the winding ratio of the grid transformer 9 may be taking into consideration when determining the power grid voltage.
  • the power grid voltage is determined via one or more local voltage measurements on the secondary side of the auxiliary transformer 7, i.e. in the auxiliary system 4 of Fig. 1, the winding ratio of both the grid transformer 9 and the auxiliary transformer 7 may be taking into consideration when determining the power grid voltage.
  • step 13 the load caused by one or more auxiliary electrical loads is reduced by reducing the operational frequency of one or more VFDs in the auxiliary system.
  • the reduction of the operational frequency of the VFDs may be implemented in various ways. For example, reducing the operational frequency may apply to all VFDs, and the reduction may be the same for all VFDs. Alternatively, the operational frequency of only selected and/or prioritized VFDs may be reduced.
  • the selected and/or prioritized VFDs may be associated with the auxiliary loads at which local voltage measurements indicate that an undervoltage event has occurred.
  • the selected and/or prioritised VFDs may also be prioritised over other VFDs in accordance with a predetermined priority list which may be established with respect to safe operation of the wind turbine. For example, a VFD that is involved in cooling the generator may be considered more important and thus prioritized over a VFD that is involved in cooling for example the yawing system.
  • step 14 the power grid voltage and/or one or more local voltages in the auxiliary system are monitored.
  • the one or more local voltages may be measured at the one or more auxiliary electrical components and/or at the one or more auxiliary electrical loads.
  • step 15 Based on the monitoring performed in step 14, it is in step 15 established whether the undervoltage event has ended or not. If the monitoring in step 14 reveals that the power grid voltage again approaches its nominal value the load reduction operation of the VFDs is terminated, and the VFDs are returned to normal operation, cf. step 16. On the other hand, if the monitoring in step 14 reveals that the power grid voltage is still at an undervoltage value the load reduction of the VFDs is continued.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

La présente invention concerne un procédé de mise en fonctionnement d'une éolienne pendant un événement de sous-tension dans lequel la tension de réseau chute à une valeur de tension de sous tension. Ladite éolienne comprend un générateur connecté de manière fonctionnelle à un réseau électrique ; un système auxiliaire comprenant un ou plusieurs composants électriques auxiliaires et une ou plusieurs charges électriques auxiliaires ; un transformateur auxiliaire connecté de manière fonctionnelle sur un côté primaire au générateur et au réseau électrique, et connecté de manière fonctionnelle sur un côté secondaire au système auxiliaire ; et un dispositif de commande de charge agencé pour réduire une ou plusieurs charges électriques auxiliaires dans le système auxiliaire en réponse à un événement de sous-tension détecté. Ledit procédé comprend les étapes consistant à déterminer, à l'aide du dispositif de commande de charge, qu'un événement de sous-tension s'est produit, et à réduire, à l'aide du dispositif de commande de charge, une ou plusieurs charges électriques auxiliaires dans le système auxiliaire, ce qui empêche ainsi le déclenchement d'un ou plusieurs composants électriques auxiliaires ou le déclenchement de la totalité de l'éolienne. La présente invention concerne également une éolienne conçue pour mettre en œuvre ledit procédé.
PCT/DK2023/050233 2022-09-30 2023-09-29 Procédé de réduction de charge dans des éoliennes WO2024067935A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
IN202211056440 2022-09-30
IN202211056440 2022-09-30
DKPA202270549 2022-11-14
DKPA202270549 2022-11-14

Publications (1)

Publication Number Publication Date
WO2024067935A1 true WO2024067935A1 (fr) 2024-04-04

Family

ID=88315370

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2023/050233 WO2024067935A1 (fr) 2022-09-30 2023-09-29 Procédé de réduction de charge dans des éoliennes

Country Status (1)

Country Link
WO (1) WO2024067935A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080001408A1 (en) * 2006-06-30 2008-01-03 Yan Liu Systems and methods for an integrated electrical sub-system powered by wind energy
US20220224146A1 (en) * 2019-05-16 2022-07-14 Westas Wind Systems A/S Controllable power backup system for wind turbine
US20220224145A1 (en) * 2019-05-16 2022-07-14 Vestas Wind Systems A/S Full dc voltage power backup system for wind turbine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080001408A1 (en) * 2006-06-30 2008-01-03 Yan Liu Systems and methods for an integrated electrical sub-system powered by wind energy
US20220224146A1 (en) * 2019-05-16 2022-07-14 Westas Wind Systems A/S Controllable power backup system for wind turbine
US20220224145A1 (en) * 2019-05-16 2022-07-14 Vestas Wind Systems A/S Full dc voltage power backup system for wind turbine

Similar Documents

Publication Publication Date Title
EP2360375B1 (fr) Procédé de fonctionnement d'une unité de dissipation d'alimentation dans une éolienne
US8264209B2 (en) Method of and apparatus for operating a double-fed asynchronous machine in the event of transient mains voltage changes
JP4501958B2 (ja) 風力発電システムおよびその制御方法
EP2628947B1 (fr) Contrôle de couple pour génératrice d'éolienne en cas d'erreur
US20160231365A1 (en) Method for operating a power generation system
US9587628B2 (en) Method for operating a wind turbine
EP2875238B1 (fr) Procédé d'actionnement d'une éolienne et système correspondant
EP2896101B1 (fr) Commande de centrale électrique pendant un événement de basse tension ou de haute tension
EP3255777B1 (fr) Dispositif de commande de génération d'énergie électrique, procédé et programme de commande de génération d'énergie électrique
US9088150B2 (en) Overvoltage clipping device for a wind turbine and method
EP3457556A1 (fr) Procédés pour faire fonctionner des systèmes d'énergie électrique
EP2702684B1 (fr) Turbine éolienne variable avec unité de dissipation d'énergie; méthode d'utilisation d'une unité de dissipation d'énergie dans une turbine éolienne
CN113700605A (zh) 控制风力涡轮以保护风力涡轮免于异常操作的系统和方法
EP3993208B1 (fr) Système et procédé de fonctionnement d'un actif générateur de puissance
CN112217228A (zh) 功率转换器的控制和操作
US9494139B2 (en) System and method for controlling a power output of a wind turbine generator
JP4894906B2 (ja) 風力発電システムの制御方法
US10790770B2 (en) Methods for operating electrical power systems
EP2798201B1 (fr) Turbine éolienne et procédé de fonctionnement de celle-ci
WO2024067935A1 (fr) Procédé de réduction de charge dans des éoliennes
EP3840212A1 (fr) Réponse sélective de limitation en tension d'un convertisseur de puissance pour atténuer les défaillances de dispositif

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23786493

Country of ref document: EP

Kind code of ref document: A1