WO2011058170A1 - Method and device for operation of a wind power plant - Google Patents
Method and device for operation of a wind power plant Download PDFInfo
- Publication number
- WO2011058170A1 WO2011058170A1 PCT/EP2010/067471 EP2010067471W WO2011058170A1 WO 2011058170 A1 WO2011058170 A1 WO 2011058170A1 EP 2010067471 W EP2010067471 W EP 2010067471W WO 2011058170 A1 WO2011058170 A1 WO 2011058170A1
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- WIPO (PCT)
- Prior art keywords
- wind turbines
- wind
- power plant
- energy storage
- grid
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 58
- 238000004146 energy storage Methods 0.000 claims abstract description 112
- 230000008878 coupling Effects 0.000 claims description 15
- 238000010168 coupling process Methods 0.000 claims description 15
- 238000005859 coupling reaction Methods 0.000 claims description 15
- 241001672018 Cercomela melanura Species 0.000 description 6
- 230000006870 function Effects 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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- 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
- F03D7/026—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor for starting-up
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- 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
- F03D7/04—Automatic control; Regulation
- F03D7/042—Automatic control; Regulation by means of an electrical or electronic controller
- F03D7/048—Automatic control; Regulation by means of an electrical or electronic controller controlling wind farms
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- 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
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/10—Combinations of wind motors with apparatus storing energy
- F03D9/11—Combinations of wind motors with apparatus storing energy storing electrical energy
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- 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
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/20—Wind motors characterised by the driven apparatus
- F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
- F03D9/255—Wind motors characterised by the driven apparatus the apparatus being an electrical generator connected to electrical distribution networks; Arrangements therefor
- F03D9/257—Wind motors characterised by the driven apparatus the apparatus being an electrical generator connected to electrical distribution networks; Arrangements therefor the wind motor being part of a wind farm
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- 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
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
-
- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The present disclosure relates to a method and device for operating a wind power plant (WPP), in particular a method and device for startup of wind turbines in a WPP. A method for start-up of wind turbines of a wind power plant comprising a grid interface for connecting the wind power plant to a grid, and a first set of wind turbines and a second set of wind turbines connected to the grid interface, wherein the wind power plant comprising an energy storage is disclosed, the method comprising starting the first set of wind turbines by supplying power from the energy storage to the first set of wind turbines, charging the energy storage with energy produced by the first set of wind turbines, and starting the second set of wind turbines by supplying power from the energy storage to the second set of wind turbines.
Description
METHOD AND DEVICE FOR OPERATION OF A WIND POWER PLANT Fl ELD OF THE INVENTION
The present invention relates to a method and device for operating a wind power plant (WPP), in particular a method and device for startup of wind turbines in a WPP.
BACKGROUND OF THE I NVENTI ON
The demands on wind power plants are increasing with the increasing share of wind power plant energy in the grid. In particular, it may be desirable that a wind power plant is able to provide or function as an effective grid stabilizer and grid energizer.
US 2008/0284172 discloses a method of start-up of at least a part of a wind power plant, and use thereof. One or more isolated wind turbines are started with power from an energy source, and the started wind turbine(s) supply power to start further wind turbines.
DESCRIPTION OF THE INVENTION
There is a need for a flexible and efficient start-up of wind turbines of a wind power plant enabling fast coupling of wind turbines to the grid, i.e. in case of grid breakdown.
Accordingly, in a first aspect the present invention relates to a method for start-up of wind turbines of a wind power plant comprising a grid interface for connecting the wind power plant to a grid, and a first set of wind turbines and a second set of wind turbines connected to the grid interface, wherein the wind power plant comprising an energy storage is provided. The method comprises starting the first set of wind turbines by supplying power from the energy storage to the first set of wind turbines and charging the energy storage with energy produced by the first set of wind turbines. Further, the method comprises starting the second set of wind turbines or a selected set of wind turbines by supplying power from the energy storage to the second or selected set of wind turbines.
The first set of wind turbines may be coupled to the grid when the first set of wind turbines has charged the energy storage. In particular, the first set of wind turbines may be coupled to the grid during start-up of the second or selected set of wind turbines.
The first set of wind turbines may be decoupled from the energy storage when the first set of wind turbines has charged the energy storage.
The method may further comprise the steps of starting the second set of wind turbines, charging the energy storage with energy produced by a selected set of wind turbines, and starting a third set of wind turbines in the wind power plant by supplying power from the energy storage to the third set of wind turbines. The second set of wind turbines may be coupled to the grid after starting the second set of wind turbines.
Before start-up of wind turbines, the wind power plant may be decoupled from the grid.
The method may further comprise the step of coupling a selected set or sets of wind turbines to the grid when the selected set or sets of wind turbines produces power equal to or above a power threshold of the wind power plant. The power threshold may be at or above the minimum energy allowed to be output to the grid from the wind power plant according to grid requirem ents.
In a second aspect the present invention relates to a wind power plant controller, in particular for start-up of wind turbines of a wind power plant, is provided, the wind power plant comprising a grid interface for connecting the wind power plant to a grid, the wind power plant comprising a first set of wind turbines and a second set of wind turbines connected to the grid interface, and an energy storage. The wind power plant controller is configured for starting the first set of wind turbines by supplying power from the energy storage to the first set of wind turbines, charging the energy storage with energy produced by the first set of wind turbines, and starting the second set or a selected set of wind turbines by supplying power from the energy storage to the second or selected set of wind turbines.
In a third aspect the present invention relates to a wind power plant controller for controlling a wind power plant, the wind power plant controller being configured for performing the method according to the first aspect.
In a fourth aspect the present invention relates to a wind power plant comprising a wind power plant controller according to the second or third aspects.
In the present disclosure, a set of wind turbines, e.g. a first set of wind turbines, a second set of wind turbines and optionally a third set of wind turbines, may comprise one or more wind turbines, such as one, two, three, four, five, six or more wind turbines. The wind power plant may comprise any suitable number of wind turbine sets, such as one, two, three, four, five or more wind turbine sets depending on desired wind power plant configuration.
Advantageously, the method enables a flexible and fast coupling of wind turbines of a wind power plant to the grid after grid breakdown or in cases where the grid cannot provide electrical power to the wind power plant. Thereby, the wind power plant may be able to assist in black start of at least a part of the grid and/or external power plants quickly after grid breakdown or failure. Thus, a reduction in the time from breakdown to restart of the grid is enabled.
It is an important advantage of the method that a wind power plant is enabled to act as a grid stabilizer, which is in particular important during black start of the grid and in a fast and efficient way can provide power for black start of the external grid and/or external units, such as other power plants.
Further, it is an advantage of the present invention that a wind power plant is able to perform black start of wind turbines of the wind power plant without energy from the grid.
BRI EF DESCRI PTI ON OF THE DRAW I NGS
The above and other features and advantages of the present invention will become readily apparent to those skilled in the art by the following detailed description of exemplary embodiments thereof with reference to the attached drawings, in which:
Fig. 1 schematically illustrates a wind power plant,
Fig. 2 schematically illustrates a wind power plant,
Fig. 3 schematically illustrates a wind power plant controller,
Fig. 4 is a flow diagram illustrating the method,
Fig. 5 is a flow diagram partly illustrating an exemplary method, and Fig. 6 illustrates an exemplary time line of the method. DETAILED DESCRIPTION
The invention relates to a wind power plant comprising a number of wind turbines and an energy storage, e.g. comprising a battery and/or a super capacitor, a battery and/or super
capacitor assembly and a power converter system, comprised within or connected to the wind power plant.
In case of a blackout on the grid, wind turbines of a wind power plant may be decoupled from the grid and would not be able to start-up without power or energy being fed to the wind turbines. However, typically an energy storage itself will not be able to start up all wind turbines within the wind power plant depending on size of the energy storage and its charging level, i.e. amount of energy stored in the energy storage, and discharging thereof.
According to the present disclosure, a wind power plant comprises or is connected to an energy storage, and the energy storage may provide energy for a first set of wind turbines to enable start-up of the first set of wind turbines. When the first set of wind turbines is started, the first set of wind turbines produces energy that is stored within the energy storage. When the energy storage is sufficiently charged or energized, the energy storage may provide energy for start-up of a second set of wind turbines. Thus, even though the capacity of the energy storage is not sufficient to provide power to start up all wind turbines of the wind power plant due to its discharging, the method includes the recharging of the energy storage and thus provides for the possible start up of all wind turbine generators of the wind power park. Furthermore, the method and power plant allow for fast coupling of selected wind turbines to the grid, i.e. one or more selected wind turbines may be coupled to the grid during start-up of other wind turbine set(s). Accordingly, the method may comprise coupling the first set of wind turbines to the grid during start-up of the second set of wind turbines.
Charging of the energy storage and start-up of further set(s) of wind turbines may be repeated until all wind turbines of the wind power plant are started. When all wind turbines of the wind power plant has been started and produce energy, the energy storage may be coupled to the grid/grid interface and function as external and/or internal grid stabilizing unit. According to the method, selected set(s) of wind turbines of the wind power plant may be coupled to the grid, e.g. by closing one or more circuit breakers, when the selected set(s) of wind turbines produce enough power or energy to be able to feed power to the grid according to grid requirements. The energy storage and its power converter system may then be used for controlling the voltage and the power delivered to the grid, thereby contributing to constant or substantially constant grid voltage and frequency. Further, the energy storage may contribute in controlling the delivered active and reactive power to the grid according to grid demand for energising and black start of loads in the grid. Selected set(s) of wind turbines of the wind power plant may be coupled to the grid when the power produced by the selected set(s) of wind turbines is not needed for recharging the energy storage.
The method may comprise coupling the first set of wind turbines to the grid when the first set of wind turbines has charged the energy storage, e.g. when the energy storage capacity has reached an energy storage threshold. In combination or alternatively, the method may comprise coupling the first set of wind turbines to the grid, when the power delivered by the first set of wind turbines reaches a power threshold for the wind power plant. The power threshold of the wind power plant may be selected according to the grid requirements setting minimum power delivered from the wind power plant. The power threshold of the wind power plant may be selected according to the energy storage capacity.
The first set of wind turbines may be coupled to the grid during start-up of the second set of wind turbines. Further, the method may comprise decoupling the first set of wind turbines from the energy storage when the first set of wind turbines has charged the energy storage, e.g. when the energy in the energy storage (capacity) has reached an energy storage threshold.
The method comprises starting the second set of wind turbines. After starting the second set of wind turbines, the method may comprise charging the energy storage with energy produced by a selected set of wind turbines. In a configuration, the first set or wind turbines may be preselected and as default be used for charging the energy storage. The wind power plant controller may be adapted to dynamically determine and select which set or sets of wind turbines that is used for charging the energy storage, e.g. based on output power from one or more wind turbine sets and/or power threshold of the wind power plant (grid requirements). The wind power plant controller may be adapted to dynamically determine and select which set or sets of wind turbines that are used for charging the energy storage based on the energy storage capacity.
For example, the first set of wind turbines may be selected for charging if the output power from the first set of wind turbines does not reach power threshold of the wind power plant. Two or more sets of wind turbines may be used for charging the energy storage. In a configuration, the most recently started set of wind turbines may be used for charging the energy storage. After charging the energy storage, e.g. with one or more selected sets of wind turbine(s), the method may comprise starting a third set of wind turbines in the wind power plant by supplying power from the energy storage to the third set of wind turbines.
Additionally, the method may comprise coupling the second set of wind turbines to the grid after starting the second set of wind turbines, e.g. when the output power from the started sets of wind turbines is at or above power threshold of the wind power plant.
The method may comprise decoupling the wind power plant from the grid before start-up, for example if the wind power plant controller identifies grid breakdown. This may be referred to as an islanding operation of the WPP.
The method may comprise coupling a selected set or sets of wind turbines to the grid when the selected set or sets of wind turbines produces a power or energy amount at or above a power threshold of the wind power plant. The power threshold of the wind power plant may be equal to or above the minimum power allowed to be output to the grid from the wind power plant according to grid requirements.
Start-up of the wind turbines of the wind power plant may be controlled by a wind power plant controller (WPPC) . The wind power plant controller m ay be configured for perform ing the method as described herein.
The wind power plant controller may be configured for controlling the internal grid configuration by opening and closing circuit breakers in the wind power plant according to a switching strategy or switching scheme. By controlling opening and closing circuit breakers, the wind power plant controller is able to couple and decouple selected parts of the wind power plant, thereby enabling flexible operation of wind turbine sets of the wind power plant.
The wind power plant controller may me adapted to determine the switching strategy based on one or more input variables, such as energy storage capacity (measured continuously or at selected points in time), power output of one or more sets of wind turbines, one or more grid requirements, and the like. The switching strategy during start-up of the wind power plant may be predetermined or dynamically adjusted during start-up of the wind power plant.
The figures are schematic and simplified for clarity, and they merely show details which are essential to the understanding of the invention, while other details have been left out.
Throughout, the same reference numerals are used for identical or corresponding parts. Fig. 1 illustrates a wind power plant (WPP) employing the method disclosed herein. The wind power plant (WPP) 2 comprises a wind power plant controller (WPPC) 4, a grid interface 6, and a number of wind turbines including a first set of wind turbines (WTG-π, WTG12, .., WTG1N) 8, a second set of wind turbines (WTG21, WTG22, .., WTG2M) 10, and optionally a third set of wind turbines (WTG31, WTG32, .., WTG3P) 12 connected to the grid interface 6 via first primary circuit breaker or switch (CB-n) 14, second primary circuit breaker (CB21) 16, and third primary circuit breaker (CB31) 18, respectively. Further, the WPP 2 comprises an energy storage unit 20. The energy storage unit 20 may comprise one or more batteries and/or super capacitors or assemblies thereof. The energy storage unit may comprise one or more
power converter systems (PCS). The first set of wind turbines 8, the second set of wind turbines 10, and optionally the third set of wind turbines 12 are each connected to the energy storage unit 20 via first secondary circuit breaker (CB2i) 22, second secondary circuit breaker (CB22 ) 24, and third secondary circuit breaker (CB32) 26, respectively. The wind turbine sets 8, 10, 12 are connected to the wind power plant controller 4 via communication network 28 enabling WPPC to send and receive control information/signals from and to wind turbine sets 8, 10, 12. Power lines 30, 32, 34 connect the wind turbines of the WPP 2 to the grid interface 6. The grid interface 6 functions as point of common connection (PCC) for the wind turbine power plant towards the grid 15. Each of the wind turbines of the WTPP 2 com prise a wind turbine controller (not shown) connected to the WPPC 4 via the
communication network 28 for exchanging control signals with the WPPC. Optionally, the energy storage unit 20 is connected to the WPPC 4 via the communication network 28 for exchanging control signals with the WPPC. Optionally, the energy storage unit 20 is connected to the grid interface 6 via circuit breaker 27 and power line 29. Circuit breaker 27 and power line 29 allows separate coupling of the energy storage to the grid interface 6 independent of the power lines 30, 32, 34, thereby providing further flexibility in controlling and operating the wind power plant.
At least during start-up of the wind power plant, the wind power plant controller 4 controls the circuit breakers 14, 16, 18, 22, 24, 26. The circuit breakers are controlled according to a switching strategy. A non-limiting example of the method will now be described referring to the wind power plant 2. The wind power plant controller 4 opens circuit breakers 14, 16, 18, 24, 26 and closes first circuit breaker 22 and starts the first set of wind turbines 8 by sending a power delivery control signal to the energy storage unit 20 and start-up control signals to the first set of wind turbines 8. The power delivery control signal to the energy storage unit 20 may initiate the start-up of the first set of wind turbines 8 with power from the energy storage unit 20. When start-up of the first set of wind turbines is completed (first start-up period ends), the output power ( P_OUT_WTG_11 , P_OUT_WTG_12, P_OUT_WTG_1 N) produced by the first set of wind turbines 8 is used for charging the energy storage unit 20 in a first charging period. When the energy storage capacity (ES_CAPACITY) of the energy storage unit 20 has reached an energy storage threshold ( ES_THRESHOLD) , the wind power plant controller 4 closes the second secondary circuit breaker 24 and starts the second set of wind turbines 10 by supplying power from the energy storage 20 to the second set of wind turbines by sending a power delivery control signal to the energy storage unit 20 and start-up control signals to the second set of wind turbines. The first set of wind turbines may be coupled to the grid during the second start-up period where the second set of wind turbines is started, by closing the
first primary circuit breaker 14. Alternatively or in combination, the first secondary circuit breaker 22 may be opened in order to prevent discharging of the energy storage 20.
When start-up of the second set of wind turbines is completed (second start-up period ends), the output power (P_OUT_WTG_21 , P_OUT_WTG_22, .., P_OUT_WTG_2M) produced by the second set of wind turbines 10 may be used for charging the energy storage unit 20 in a second charging period. The WPPC may be configured for selecting which set of wind turbines that is used for charging (WTG_CHARGE) the energy storage unit 20. Starting of wind turbine sets and charging of the energy storage is repeated until all wind turbines are started or until the WPPC determines that an optimum number of wind turbine sets are started or in operation, e.g. grid requirements are fulfilled.
Fig. 2 illustrates a wind power plant (WPP) 2' employing the method disclosed herein. In WPP 2', the circuit breaker 27 and power line 29 are omitted. The energy storage unit 20 may be connected to the grid interface 6 via one or more of the power lines 30, 32, 34.
Fig.3 illustrates an exemplary wind power plant controller WPPC 4 for start-up of wind turbin es of a wind power plant. The PPC 4 com prises a controller interface 60 and a processor 62 connected to the controller interface 60 via connection 63. The controller interface 60 comprises a number of connectors for electrically and/or optically connecting the WPPC 4 to wind turbine controllers, energy storage or other units or devices in the wind power plant, e.g. via communication network 28. Further, the WPPC 4 comprises a memory 64. The memory 64 may comprise one or more preset or operator adjustable parameters, e.g. one or more thresholds, switching scheme settings for black start of the wind power plant, plant configuration data indicative of the configuration of the wind power plant, power plant data, wind turbine data of wind turbines in the plant or other data relevant for performing control of the wind turbine power plant, e.g. including an energy storage. The WPPC 4 is configured for starting the first set of wind turbines 8 by supplying power from the energy storage to the first set of wind turbines. The WPPC 4 sends control signals to the circuit breakers
(CB_CONTROL), wind turbines (WTG_CONTROL) and energy storage (ES_CONTROL) in the wind power plant to effect start-up of the first set of wind turbines. Upon start-up of the first set of wind turbines, the WPPC 4 is configured for charging the energy storage with energy produced by the first set of wind turbines. When the energy storage is sufficiently charged, the second set of wind turbines are started by supplying power from the energy storage to the second set of wind turbines.
Fig. 4 is a flow diagram illustrating the method for start-up of wind turbines of a wind power plant comprising a grid interface for connecting the wind power plant to a grid, and a first set of wind turbines and a second set of wind turbines connected to the grid interface, wherein
the wind power plant comprising an energy storage. The method 100 comprises starting 102 in a first start-up period the first set of wind turbines by supplying power from the energy storage to the first set of wind turbines. Upon start-up of the first set of wind turbines, the method proceeds to charging 104 the energy storage with energy produced by the first set of wind turbines in a first charging period. When the energy storage is sufficiently charged, e.g. a charging criterion is fulfilled, the method proceeds to starting 106 the second set of wind turbines by supplying power from the energy storage to the second set of wind turbines. Start-up and charging of the energy storage may be repeated until all or a desired number of wind turbine sets have been started. It is to be understood that the method may initially comprise starting the energy storage. Thus the energy storage may be used for energizing the WPP internal grid.
Fig. 5 is a flow diagram illustrating an exemplary method for start-up of wind turbines. The m ethod 100' com prises starting 102 a first set of wind turbines with the energy storage and setting the first set of wind turbines as WTG_CHARGE. The method then proceeds to charging 104 the energy storage with WTG_CHARGE, and starting 106 a selected set, e.g. a second set, of wind turbines with the energy storage. The selection of the wind turbine set to be started may be according to a prioritized list or as illustrated in Fig. 5 according to a wind turbine set index i that is being incremented for each start-up session. Charging the energy storage may be continued until desired energy storage capacity is reached. Upon charging the energy storage, the method checks 108 if all wind turbines or desired number of wind turbines have been started. If not all wind turbines have been started, it is determ ined 110 if some of the started wind turbine sets can be coupled to the grid, e.g. if grid requirements are fulfilled. If YES, the respective wind turbine set or sets that are ready for coupling are coupled to the grid 112. After coupling wind turbine sets to the grid or if the answer in 110 is NO, the m ethod proceeds to 114, where the wind turbine set index is increm en ted and optionally a wind turbine set for charging (WTG_CHARGE) is selected. Then the method returns to charging the energy storage with WTG_CHARGE. If all wind turbine sets have been started in 110, the wind turbine sets are connected to the grid 116 in accordance with grid requirem ents. The circuit breakers in the wind power plant are opened and closed according to a switching strategy by sending control signals from the wind power plant controller.
Fig. 6 shows an exemplary switching strategy in accordance with the method with reference to the wind power plant 2, 2' as illustrated in Fig. 1. The time t0 indicates the beginning of the first start-up period A, t indicates the end of the first start-up period A, t2 indicates the beginning of the first charging period B, and t3 indicates the end of the first charging period B. Further, t4 and t5 indicate the beginning and end of the second start-up period C,
respectively, and t6 and t7 indicate the beginning and end of the second charging period D, respectively. In one or more switching strategies, ti may be equal to t2. In one or more switching strategies, t3 may be equal to t4. In one or more switching strategies, t5 may be equal to t6.
The circuit breakers of the wind power plant are switched in order to enable desired start-up and charging. Table 1 and Table 2 below illustrates examples of status of circuit breakers of Fig. 1 and Fig.2, where "0" indicates an open (decoupled) circuit breaker and "1" indicates a closed (coupled) circuit breaker. "X" indicates that both open and closed circuit breaker may be employed.
Table 1 - Switching strategy for circuit breakers
I n the switching strategy illustrated by Table 1 , the first set of wind turbines is decoupled from the energy storage after the first charging period B. When CB12 is open in period C and D, CB may be closed during at least a part of the second start-up period C and the second charging period D for coupling the first set of wind turbines to the grid or to other wind turbine sets via the grid interface. The second set of wind turbines is coupled to the energy storage in the second charging period D by closed CB22 and thereby functions as
WTG CHARGE.
In the switching strategy illustrated by Table 2, the first set of wind turbines is decoupled from the energy storage after the first charging period B and coupled to the energy storage in the second charging period D and thereby functions as WTG_CHARGE together with the third set of wind turbines. The third set of wind turbines is started in the second start-up period C. Optionally, CB-n may be closed during at least a part of (or during the whole of) the second start-up period and/or the second charging period for coupling the first set of wind turbines to the grid or to other wind turbine sets via the grid interface. The first and second set of wind turbines are coupled to the energy storage in the second charging period and thereby function as WTG_CHARGE.
It should be noted that in addition to the exemplary embodiments of the invention shown in the accompanying drawings, the invention may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art.
Claims
1. A method for start-up of wind turbines of a wind power plant comprising a grid interface for connecting the wind power plant to a grid, and a first set of wind turbines and a second set of wind turbines connected to the grid interface, wherein the wind power plant comprises an energy storage system, the method comprising:
- starting the first set of wind turbines by supplying power from the energy storage to the first set of wind turbines,
- charging the energy storage with energy produced by the first set of wind turbines, and
- starting the second set of wind turbines by supplying power from the energy storage to the second set of wind turbines.
2. A method according to claim 1 , wherein the first set of wind turbines is coupled to the grid when the first set of wind turbines has charged the energy storage.
3. A method according to claim 2, wherein the first set of wind turbines is coupled to the grid during start-up of the second set of wind turbines.
4. A method according to any of the preceding claims, wherein the first set of wind turbines is decoupled from the energy storage when the first set of wind turbines has charged the energy storage.
5. A method according to any of the preceding claims, further comprising the steps of starting the second set of wind turbines, charging the energy storage with energy produced by a selected set of wind turbines, and starting a third set of wind turbines in the wind power plant by supplying power from the energy storage to the third set of wind turbines.
6. A method according to any of the preceding claims, wherein the second set of wind turbines is coupled to the grid after starting the second set of wind turbines.
7. A method according to any of the preceding claims, further comprising the step of decoupling the wind power plant from the grid before start-up.
8. A method according to any of the preceding claims, further comprising the step of coupling a selected set or sets of wind turbines to the grid when the selected set or sets of wind turbines produces power equal to or above a power threshold of the wind power plant.
9. A method according to claim 8, wherein the power threshold is at or above the minimum energy allowed to be output to the grid from the wind power plant according to grid requirem ents.
10. A wind power plant controller for start-up of wind turbines of a wind power plant, the wind power plant comprising a grid interface for connecting the wind power plant to a grid, the wind power plant comprising a first set of wind turbines and a second set of wind turbines connected to the grid interface, and an energy storage, wherein the wind power plant controller is configured for starting the first set of wind turbines by supplying power from the energy storage to the first set of wind turbines, charging the energy storage with energy produced by the first set of wind turbines, and starting the second set of wind turbines by supplying power from the energy storage to the second set of wind turbines.
11. A wind power plant controller for controlling a wind power plant, the wind power plant controller being configured for performing the method according to any of claims 1-9.
12. A wind power plant comprising a wind power plant controller according to any of claims 10-11 and a number of wind turbines.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US26147109P | 2009-11-16 | 2009-11-16 | |
| US61/261,471 | 2009-11-16 | ||
| DKPA200970209 | 2009-11-16 | ||
| DKPA200970209 | 2009-11-16 |
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| Publication Number | Publication Date |
|---|---|
| WO2011058170A1 true WO2011058170A1 (en) | 2011-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2010/067471 WO2011058170A1 (en) | 2009-11-16 | 2010-11-15 | Method and device for operation of a wind power plant |
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| Country | Link |
|---|---|
| WO (1) | WO2011058170A1 (en) |
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