WO2018121820A1 - Gestionnaire de référence de puissance pour éolienne - Google Patents

Gestionnaire de référence de puissance pour éolienne Download PDF

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Publication number
WO2018121820A1
WO2018121820A1 PCT/DK2017/050386 DK2017050386W WO2018121820A1 WO 2018121820 A1 WO2018121820 A1 WO 2018121820A1 DK 2017050386 W DK2017050386 W DK 2017050386W WO 2018121820 A1 WO2018121820 A1 WO 2018121820A1
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WO
WIPO (PCT)
Prior art keywords
power
active
management module
reactive
wind turbine
Prior art date
Application number
PCT/DK2017/050386
Other languages
English (en)
Inventor
Gert Karmisholt Andersen
Duy Duc DOAN
Torsten Lund
Morten Risskov KNUDSEN
Kent Tange
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 WO2018121820A1 publication Critical patent/WO2018121820A1/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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • 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
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • 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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • 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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • 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
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Definitions

  • the invention relates to a power reference manager for a wind turbine generator. Background to the invention
  • a wind turbine generator converts energy contained in wind into electrical power.
  • a power converter is also included to modify the electrical power produced by the generator into a predictable output that is suitable in form for delivery to a power grid.
  • a converter controller of the wind turbine generator adjusts the power converter output according to power references received from internal and external sources.
  • the converter controller may include respective control modules for controlling the active power and the reactive power produced by the converter.
  • the demands of the power grid may vary over time according to the states of other power plants connected to the grid, grid faults and the total power consumption from the grid.
  • These demands manifest in an active power reference, which relates to the real power required by the grid for delivery to users, and a reactive power reference that relates to supporting the active power delivery from the grid.
  • Each of these references is transmitted to the respective control modules of the converter controller.
  • a wind turbine generator generally includes various auxiliary systems that consume electrical power to support operation of the plant.
  • auxiliary systems may include coolant circuits, anti-icing systems and de-icing systems, for example.
  • coolant circuits As these systems typically require a steady power supply, they are not powered by the generator directly, but instead use a portion of the electrical power output of the power converter. Accordingly, the demands of the auxiliary systems increase the total active and reactive power that the power converter must supply.
  • the power generating capability of the wind turbine generator may limit its ability to meet the total demand indicated by the various power references sent to the converter controller.
  • the power generating capability at any time is primarily determined by the properties of the generator and the energy contained in wind incident on a rotor of the wind turbine generator.
  • the total power demand varies according to the above influences, and may rise if grid demand rises, or if an auxiliary system such as a de-icing system suddenly activates, for example. If the generating capability is insufficient to meet the instantaneous demand, the power converter may fail to deliver the required active and reactive power, in which case there is a risk that the converter could 'trip', meaning that it shuts down by disabling its pulse-width modulated output control signals. To avoid this, in such situations the wind turbine generator may have to be temporarily disconnected from the grid.
  • a first aspect of the invention provides a power reference management module for a power converter of a wind turbine generator.
  • the power reference management module comprises an input arranged to receive multiple power reference values, a processor arranged to determine, based on the received power reference values, an active power target and a reactive power target.
  • the power reference manager further comprises an output arranged to transmit the active power target and the reactive power target to the power converter.
  • the received power reference values may comprise at least one internal active power reference value arising from within the wind turbine generator, and at least one external power reference value originating from a wind turbine controller or a power plant controller.
  • the received power reference values may comprise at least two internal active power reference values, in which case the processor is arranged to prioritise the internal power reference values and to determine the active power target and the reactive power target based on the prioritisation.
  • the processor may be further arranged to categorise one or more of the internal power reference values as essential, and to determine the active power target and the reactive power target so that respective power demands to which the essential power reference values relate can be met.
  • the external power reference values may comprise an active power reference and a power factor reference, in which case the processor is configured to determine a reactive power reference for the power network based on the active power reference and the power factor reference.
  • the input is also arranged to receive an active power limit and a reactive power limit, in which case the processor is arranged to determine the active power target based on the active power limit, and to determine the reactive power target based on the reactive power limit.
  • the processor may be arranged to determine an active power target that exceeds the active power limit if the total of the essential internal power references exceeds the active power limit.
  • the processor may be operable to prioritise an active power target, which exceeds the active power limit, over a reactive power demand indicated by the received power reference values.
  • the processor may be operable to prioritise a reactive power target, which exceeds the reactive power limit, over an active power demand indicated by the received power reference values.
  • the invention also extends to a power management module comprising the power reference management module of the above aspect.
  • the power management module may further comprise a power capability manager that is arranged to determine a set of active power limits and reactive power limits for the wind turbine generator, for example in the form of a P-Q chart.
  • the power capability manager may be arranged to prioritise between active power and reactive power when determining the active power limit and the reactive power limit.
  • the power management module may also comprise a degrade mode manager that is arranged to determine at least one degrade factor based on one or more operating parameters of the wind turbine generator.
  • the degrade factor represents a proportional reduction in generating capability of the wind turbine generator, and is transmitted to the power capability manager.
  • the power capability manager generates the active power limit and the reactive power limit based on the or each degrade factor. If the power management module is also arranged to prioritise between active and reactive power, the power capability manager may be configured to use the or each degrade factor to reduce only the active power limit when reactive power is prioritised, and to reduce only the reactive power limit when active power is prioritised.
  • Figure 1 is a schematic diagram of a wind turbine generator that is suitable for use with embodiments of the invention
  • Figure 2 is a schematic diagram of an architecture of a full-scale converter based wind power plant that is suitable for use with embodiments of the invention
  • Figure 3 is a block diagram of a converter controller of the converter of Figure 2.
  • Figure 4 is a representation of a typical P-Q chart used by the converter controller of Figure 3.
  • Figure 1 shows an individual wind turbine generator 1 of a kind that may be controlled according to embodiments of the invention. It should be appreciated that the wind turbine generator 1 of Figure 1 is referred to here by way of example only, and it would be possible to implement embodiments of the invention into many different types of wind turbine systems.
  • the wind turbine generator 1 shown is a three-bladed upwind horizontal-axis wind turbine (HAWT), which is the most common type of turbine in use.
  • the wind turbine generator 1 comprises a turbine rotor 2 having three blades 3, the rotor 2 being supported at the front of a nacelle 4 in the usual way. It is noted that although three blades is common, different numbers of blades may be used in alternative embodiments.
  • the nacelle 4 is in turn mounted at the top of a support tower 5, which is secured to a foundation (not shown) that is embedded in the ground.
  • the nacelle 4 contains a generator (not shown in Figure 1) that is driven by the rotor 2 to produce electrical energy.
  • the wind turbine generator 1 is able to generate power from a flow of wind passing through the swept area of the rotor 2 causing the rotation of the blades 3.
  • FIG. 2 an example of a wind power plant 12 to which methods according to embodiments of the invention may be applied is shown.
  • the example shown is representative only and the skilled reader will appreciate that the methods described below may be applicable to many different configurations.
  • the example shown in Figure 2 is based on a full-scale converter architecture, embodiments of the invention may be used with other types of converter and in general terms the invention is suitable for use with all topologies.
  • the wind power plant 12 shown in Figure 2 includes a single wind turbine generator 1 such as that shown in Figure 1 , but in practice further wind turbine generators may be included.
  • the wind turbine generator 1 comprises an electrical generator 20 that is driven by a rotor (not shown in Figure 2) to produce electrical power.
  • the wind turbine generator 1 includes a low voltage link 14 defined by a bundle of low voltage lines 16 terminating at a coupling transformer 18, which acts as a terminal that connects the wind turbine generator 1 to a grid transmission line that in turn connects to a power grid. Electrical power produced by the wind turbine generator 1 is delivered to the grid through the coupling transformer 18.
  • the power produced in the electrical generator 20 is three-phase AC, but is not in a form suitable for delivery to the grid, in particular because it is typically not at the correct frequency or phase angle.
  • the wind turbine generator 1 includes a power converter 22 and a filter 24 disposed between the electrical generator 20 and the coupling transformer 18 to process the electrical generator 20 output into a suitable waveform having the same frequency as the grid and the appropriate phase angle.
  • the power converter 22 provides AC to AC conversion by feeding electrical current through an AC-DC converter 26 followed by a DC-AC converter 28 in series.
  • the AC-DC converter 26 is connected to the DC-AC converter 28 by a conventional DC link 30, which includes a switched resistor 32 to act as a dump load to enable excess energy to be discharged, and a capacitor 34 providing smoothing for the DC output.
  • any suitable power converter 22 may be used.
  • the AC-DC and DC-AC parts of the power converter 22 are defined by respective bridges of switching devices (not shown), for example in the configuration of a conventional two level back-to-back converter.
  • Suitable switching devices for this purpose include integrated gate bipolar transistors (IGBTs) or metal-oxide-semiconductor field-effect transistors (MOSFETs).
  • IGBTs integrated gate bipolar transistors
  • MOSFETs metal-oxide-semiconductor field-effect transistors
  • the switching devices are typically operated using pulse-width modulated drive signals.
  • the smoothed DC output of the AC-DC converter 26 is received as a DC input by the DC- AC converter 28 and creates a three-phase AC output for delivery to the coupling transformer 18.
  • the DC-AC converter 28 is configured to provide a level of control over the characteristics of the AC power produced, for example to increase the relative reactive power in dependence on grid demand. Noting that the magnitude, angle and frequency of the output is dictated by grid requirements, and that the voltage is set at a constant level in accordance with the specifications of the low voltage link 14, in practice only the current of the AC output is controlled, and a converter controller 36 is provided for this purpose.
  • the converter controller 36 forms part of an overall control system that controls operation of the wind power plant 12, and is described in more detail later with reference to Figure 3.
  • the AC output leaves the power converter 22 through the three power lines 16, one carrying each phase, which together define the low voltage link 14.
  • the low voltage link 14 includes the filter 24, which in this embodiment comprises a respective inductor 38 with a respective shunted filter capacitor 40 for each of the three power lines 16, to provide low-pass filtering for removing switching harmonics from the AC waveform.
  • the three power lines 16 may also each include a respective circuit breaker (not shown) for managing faults within the wind power plant 12.
  • the low voltage link 14 terminates at the coupling transformer 18 which provides a required step-up in voltage.
  • a high voltage output from the coupling transformer 18 defines a wind turbine generator terminal 42, which acts as a point of common coupling for the wind power plant 12.
  • the low voltage link 14 also includes three branches, one for each phase, that define auxiliary power lines 44 that divert some of the power that is output from the filter 24 for powering auxiliary systems of the wind power plant 12 such as de-icing systems, anti-icing systems and cooling systems.
  • PCONV power that is output from the power converter 22, or PCONV
  • PAUX auxiliary systems
  • the converter controller 36 of this embodiment is configured to address this by prioritising the various power references that it receives and adjusting the total power reference according to which the power converter 22 is controlled, as shall be explained in more detail now with reference to Figure 3.
  • the converter controller 36 of this embodiment comprises an active power controller 46, a reactive power controller 48, and a software block defining a power management module 50.
  • the active power controller 46 and the reactive power controller 48 operate in tandem to issue drive signals to the switching devices of the power converter 22 to control the active and reactive components of its AC output.
  • the active power controller 46 is configured to receive an active power reference from the power management module 50
  • the reactive power manager 48 is configured to receive a reactive power reference from the power management module 50.
  • the power management module 50 provides a suite of functions that enable the processing and optimisation of power references that arise within the wind power plant 12, and those received from external sources such as a transmission system operator responsible for the grid, a power plant controller responsible for multiple wind turbine generators within a single wind power plant, or a turbine controller, for example.
  • the power management module 50 is modularised, in that it comprises a set of discrete modules that each provide a specific function. In this embodiment, those modules are implemented as individual software blocks within a common processing unit, but in other arrangements dedicated hardware modules could be used.
  • the modularised arrangement enhances integration with the converter controller 36, in particular because it enables individual functions to be developed and upgraded without impacting other functions. Moreover, a clearly defined hierarchy between the different functions can be created, thus improving interaction between the functions and therefore improving the efficiency of the converter controller 36.
  • the power management module 50 includes a power reference manager 52, a power capability manager 54 and a degrade mode manger 56. These modules are ordered according to a hierarchy in which the degrade mode manager 56 provides inputs to the power capability manager 54, which in turn provides inputs to the power reference manager 52, which then transmits an active power reference and a reactive power reference to the active power controller 46 and the reactive power controller 48 respectively.
  • the degrade mode manager 56 is arranged to degrade, or de-rate, the power generating capability of the generator 20 based on instantaneous operating parameters. For example, the generating capability may be degraded if the temperature of a coolant system of the wind turbine generator 1 is higher than it should be, or if a module within the power converter 22 develops a fault.
  • the degrade mode manager 56 therefore relates to the level of power that the wind turbine generator 1 is able to produce at a fundamental level, in view of either safety considerations or physical constraints. To this end, the degrade mode manager 56 calculates degrade factors of between 0 and 1 that are applied globally throughout the system. In a simplified example, if the degrade mode manager 56 determines that the generator 20 is only capable of outputting half of its normal capacity in terms of active power due to elevated coolant temperature, the degrade mode manager 56 calculates a degrade factor of 0.5 for active power.
  • the degrade factors calculated by the degrade mode manager 56 are output to the power capability manager 54, which uses the factors to update a P-Q chart that defines the ratio of active power to reactive power that the wind turbine generator 1 is able to produce, as well as absolute magnitudes for each type of power.
  • a P-Q chart 60 that may be used by the converter controller 36 is shown in Figure 4, which plots active power in kilowatts, on the x-axis, against reactive power in kilovolt-amperes reactive, on the y-axis.
  • a solid line 62 forming a trapezoidal shape represents the capability of the generator 20 when operating at full capacity. The skilled reader will appreciate that this shape is typical for any P-Q chart for a generator 20. Within the solid line 62, a dashed line 64 forming a smaller trapezium represents a degraded capability for the generator 20.
  • both active and reactive power are degraded in the degraded capability represented by the dashed line 64.
  • only one of these may be degraded.
  • active power is prioritised over reactive power
  • reactive power is degraded.
  • the lines shown on the P-Q chart 60 therefore define the long-term power generating capability of the wind turbine generator 1.
  • the power capability manager 54 updates the P-Q chart 60 according to the degrade factors generated by the degrade mode manager 56, if those factors fall below 1. Active power and reactive power are degraded by the same factor.
  • the power capability manager 54 then generates active and reactive power limits by checking the updated P-Q chart 60 against a prioritisation of active power against reactive power, which is defined by an operating mode of the wind turbine generator 1 as indicated by the power plant controller or the turbine controller.
  • the power capability manager 54 adjusts the active and reactive power limits accordingly by degrading the active power limit further to enable the reactive power demand to be met.
  • the power capability manager 54 has updated the P-Q chart 60 in accordance with the degrade factor supplied by the degrade mode manager 56, and generated active and reactive power limits in accordance with the prioritisation between the two types of power, those power limits are communicated back to the power plant controller or turbine controller as a request for power reduction.
  • the power plant controller and turbine controller can then take the request into account when generating the next set of power references, thereby providing a feedback loop for this element of the control.
  • the updated P-Q chart 60 is transmitted to the power reference manager 52, which also receives several power references from various sources.
  • the power reference manager 52 includes an input (not shown) that is configured to receive the various power references.
  • the power reference manager 52 further includes a processor 58 that is arranged to analyse the input power references to determine output active and reactive power references, and an output (not shown) configured to transmit those references to the power converter 22, as shall be described.
  • the references received at the input of the power reference manager 52 include the active and reactive power references received from the power plant controller or turbine controller, along with various internal active power references that together define the auxiliary demand
  • the power reference manager 52 also prioritises reactive power over active power or reverse in the short-term according to the same prioritisation applied by the power capability manager 54. This entails setting an active or reactive power reference that is outside of the P-Q chart 60 for a short period to meet the prioritised type of demand, as explained in more detail below.
  • the power plant controller or turbine controller issues an active power reference indicating the level of real power that the wind power plant 12 must deliver, along with a reactive power reference.
  • the power plant controller or turbine controller may supply a power factor (or 'CosPhi') reference, that defines the ratio of real power to the total power dissipated in the system, or 'apparent power', in which case the power reference manager 52 is responsible for determining a reactive power reference based on the active power reference and the power factor reference.
  • the reactive power reference can be derived from these inputs using basic geometric and trigonometric relations.
  • the power reference manager 52 may have the option either to calculate the reactive power reference from the power factor and active power references, or to use the reactive power reference supplied by the power plant controller or turbine controller.
  • PSSTD power used for side-to-side tower dampening
  • the power reference manager 52 compares the power references that it receives with the present capability of the wind turbine generator 1 as indicated by the P-Q chart 60 received from the power capability manager 54, and determines whether the demands to which those references relate can all be met whilst simultaneously supplying adequate reactive power.
  • the power reference manager 52 generates active and reactive power references for the active power controller 46 and the reactive power controller 48 respectively. If all demands indicated to the power reference manager 52 can be met without breaching the limits of the P-Q chart 60 received from the power capability manager 54, the references generated by the power reference manager 52 simply represent the respective totals of the different active and reactive power references that it receives.
  • the power reference manager 52 By creating the active and reactive power references based on the various demands arising throughout the system, the power reference manager 52 avoids operating the wind turbine generator 1 at its operational limits - as indicated by the power capability manager 54 - at all times. This in turn increases operational efficiency.
  • the power reference manager 52 acts to prioritise the references relating to essential services, such as Pi Ce and P aU x as noted above, and determines active and reactive power references that meet those demands at least. Of the remaining references, the power reference manager 52 seeks to meet as many as possible according to the order of priority shown above whilst also supplying power to the grid.
  • the power reference manager 52 also defines a short-term limit for apparent power produced by the generator 20 outside the normal operating limits defined by the P-Q chart 60.
  • This short-term limit is determined according to thermal considerations, both in terms of long-term wear arising from thermal stress and also short-term failure due to extreme temperatures.
  • the reactive and active power components can be varied to suit instantaneous priorities. In this context, 'short-term' typically entails a duration of a few minutes at most.
  • the power reference manager 52 determines that the essential services cannot be sustained whilst also supplying some power to the grid, it can provide short-term boosting by prioritising active power over reactive power, and in doing so move outside the P-Q chart 60 determined by the power capability manager 54 temporarily.
  • the power reference manager 52 increases the active power reference beyond the P-Q chart limit, and decreases the reactive power reference accordingly within the constraints of the total electrical power that the generator 20 can produce.
  • reactive power is prioritised by the power plant controller or turbine controller for enhanced stability, the power reference manager 52 increases the reactive power reference outside of the P-Q chart 60 for a short time, within the boundaries defined by the short-term apparent power limit.
  • the power reference manager 52 determines active and reactive power references that enable only the essential services to be sustained, whilst continuing to supply some power (Pi.) to the grid, according to the prioritisation between active and reactive power indicated by the power plant controller or turbine controller. Accordingly, the maximum active power that can be supplied to the grid can be represented as follows:
  • PcoNV(max) is the maximum active power that the generator 20 is able to produce, as determined by the degrade mode manager 56 as a function of the temperature of water in the cooling system and the line voltage.
  • the power reference manager 52 receives an active power reference from the grid that exceeds PL(iim)
  • the active power reference that is passed to the active power controller 46 is capped at PL(iim)- In this situation, no power is supplied to meet the non-essential demands listed above.
  • PcoNV(max) may exceed the active power limit indicated by the power capability manager 54 with reference to the P-Q chart 60 for the wind turbine generator 1. Accordingly, P_(iim) should be treated as a short-term limit, since sustained operation outside of the P-Q chart 60 should be avoided to avoid excessive thermal stresses within the wind turbine generator 1.
  • the time period for which Pi_(iim) can be used will depend on how close it is to the maximum apparent power that can be produced by the generator 20 in the short-term as described above; the closer Pi.(iim) is to the maximum apparent power, the shorter the time period for which the power reference manager 52 can use Pi_(iim) as the active power reference.
  • the power reference manager 52 provides a boosting function to enable active or reactive power to be supplied to the grid in the short-term, for example when local wind speed is low and so the generating capability of the wind turbine generator 1 is curtailed.
  • the power reference manager 52 makes it possible to use a margin defined between the P-Q chart 60 for the wind turbine generator 1 and its maximum generating potential for short periods in a controlled manner.
  • the limits determined by the power capability manager 54 must be adhered to so that the wind turbine generator 1 does not operate outside of its intended range for long periods, to avoid prolonged thermal stress within the wind turbine generator 1 , which could lead to wear or failure as mentioned above.
  • the power reference manager 52 determines that the demands for active and reactive power made by the power plant controller or the turbine controller can be met whilst operating within the P-Q chart 60 defined by the power capability manager 54 and whilst also satisfying the present prioritisation between active and reactive power, the power reference manager 52 calculates active and reactive power references for the respective controllers that fall within those limits. If power cannot be supplied to the grid without operating outside the P-Q chart 60 for a longer period, the wind power plant 12 must be shut down until generating capacity become sufficient for stable operation.
  • the power management module 50 of this embodiment separates the power management of the wind turbine generator 1 into two distinct categories, namely long-term power management for stable operation, and short-term power management for temporary boosting of active power when required.
  • the long-term power management is handled by the power capability manager 54, while the power reference manager 52 is configured to intervene during periods of conflicting demand or reduced generating capacity to boost the real power output of the wind turbine generator 1 in the short-term, to provide continued support for essential functions.
  • the power reference manager 52 therefore advantageously provides a systematic and intelligent approach to handling the various and, at times, conflicting power references that arise within the wind power plant 12 to optimise the way in which power that is generated is used, and to ensure that the power converter 22 does not trip as a result of operating based on a total power reference that is unachievable.
  • the defined prioritisation of the different power references brings clarity to the way in which the wind turbine generator 1 is operated in all circumstances.

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

Abstract

La présente invention concerne un module de gestion de référence de puissance (52) pour un convertisseur de puissance (22) d'une éolienne (1), le module de gestion de référence de puissance (52) comprenant : une entrée agencée pour recevoir de multiples valeurs de référence de puissance ; un processeur (58) agencé pour déterminer, sur la base des valeurs de référence de puissance reçues, une cible de puissance active et une cible de puissance réactive ; et une sortie agencée pour transmettre la cible de puissance active et la cible de puissance réactive au convertisseur de puissance (22).
PCT/DK2017/050386 2016-12-27 2017-11-23 Gestionnaire de référence de puissance pour éolienne WO2018121820A1 (fr)

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DKPA201600796 2016-12-27
DKPA201600796 2016-12-27

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WO2018121820A1 true WO2018121820A1 (fr) 2018-07-05

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Citations (3)

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DE102008039429A1 (de) * 2008-08-23 2010-02-25 DeWind, Inc. (n.d.Ges.d. Staates Nevada), Irvine Verfahren zur Regelung eines Windparks
EP2654165A1 (fr) * 2012-04-17 2013-10-23 Gamesa Innovation & Technology, S.L. Système et procédé pour établir, mettre en service et faire fonctionner une installation d'énergie éolienne
WO2015086022A1 (fr) * 2013-12-11 2015-06-18 Vestas Wind Systems A/S Centrale éolienne et procédé permettant de réguler une injection de courant réactif dans une centrale éolienne

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008039429A1 (de) * 2008-08-23 2010-02-25 DeWind, Inc. (n.d.Ges.d. Staates Nevada), Irvine Verfahren zur Regelung eines Windparks
EP2654165A1 (fr) * 2012-04-17 2013-10-23 Gamesa Innovation & Technology, S.L. Système et procédé pour établir, mettre en service et faire fonctionner une installation d'énergie éolienne
WO2015086022A1 (fr) * 2013-12-11 2015-06-18 Vestas Wind Systems A/S Centrale éolienne et procédé permettant de réguler une injection de courant réactif dans une centrale éolienne

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