CN112761865B - Rain erosion prevention control method and device for wind turbine generator blade and wind driven generator - Google Patents
Rain erosion prevention control method and device for wind turbine generator blade and wind driven generator Download PDFInfo
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- 230000003628 erosive effect Effects 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000002265 prevention Effects 0.000 title claims abstract description 36
- 230000009467 reduction Effects 0.000 claims abstract description 23
- 238000004364 calculation method Methods 0.000 claims description 60
- 238000005259 measurement Methods 0.000 claims description 22
- 238000004590 computer program Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 5
- 230000007797 corrosion Effects 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000010248 power generation Methods 0.000 description 6
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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
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/065—Rotors characterised by their construction elements
- F03D1/0675—Rotors characterised by their construction elements of the blades
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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
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/0608—Rotors characterised by their aerodynamic shape
- F03D1/0633—Rotors characterised by their aerodynamic shape of the blades
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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
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
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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
- F03D7/0276—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling rotor speed, e.g. variable speed
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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
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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
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
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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
Abstract
The invention provides a rain erosion prevention control method and device for a wind turbine generator blade and a wind driven generator, wherein the rain erosion prevention control method for the wind turbine generator blade comprises the following steps: acquiring rainfall intensity of the environment where the wind driven generator is located; and judging whether the rainfall intensity exceeds a rainfall intensity threshold value, and if so, performing speed reduction control on the wind driven generator based on the rainfall intensity. The invention can control the rotating speed of the impeller of the wind turbine generator, reduce the linear speed of the blade tip, further reduce the impact of raindrops on the blade and reduce the rain erosion degree of the rainwater blade.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a rain erosion prevention control method and device for a wind turbine generator blade and a wind driven generator.
Background
With the large-scale development and application of wind turbines, more and more attention is paid to blade corrosion, particularly to the corrosion of the front edge of the blade. The wind turbine generator is in a severe operating environment, is in an operating power generation state in rainy and snowy weather, has corrosiveness due to rainwater, and is the most important factor for causing the front edge of the wind turbine blade to be corroded in a wind power plant with more rainfall. Rain erosion is a corrosion phenomenon caused by high-speed impact of raindrops on the front edge of the blade, and the linear velocity at the blade tip is the largest, so that the more the front edge is close to the blade tip, the more serious the corrosion is.
The rain erosion phenomenon of the blade not only puts higher requirements on the design and manufacturing process of the blade, but also greatly influences the service life of the blade of the in-service wind turbine generator and the operation performance of the generator. Blade leading edge erosion can have a detrimental effect on aerodynamic performance, with a slight leading edge erosion resulting in a 5% reduction in annual energy production and a severe leading edge erosion resulting in a maximum 25% reduction in annual energy production. Therefore, how to reduce the rain erosion degree of the wind turbine blade in rainy and snowy weather is called as a problem to be solved urgently.
Disclosure of Invention
In view of this, the invention aims to provide a rain erosion prevention control method and device for a wind turbine generator blade and a wind driven generator, which can control the rotating speed of an impeller of the wind turbine generator and reduce the linear speed of a blade tip, so that the impact of raindrops on the blade is reduced, and the rain erosion degree of the rainwater blade is reduced.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, an embodiment of the present invention provides a method for controlling rain erosion prevention of a wind turbine blade, including: acquiring rainfall intensity of the environment where the wind driven generator is located; and judging whether the rainfall intensity exceeds a rainfall intensity threshold value, and if so, carrying out speed reduction control on the wind driven generator based on the rainfall intensity.
Further, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the determining whether the rainfall intensity exceeds a rainfall intensity threshold value, and if so, performing rotation reduction control on the wind turbine generator based on the rainfall intensity includes: determining a maximum rotational speed of the wind turbine based on the rainfall intensity; determining a rainfall intensity threshold based on the rainfall intensity and the maximum rotation speed; and when the rainfall intensity reaches the rainfall intensity threshold value, carrying out rotation speed reduction control on the wind driven generator based on the rainfall intensity.
Further, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where a rated rotation speed of the wind turbine is obtained; calculating the maximum rotating speed of the wind driven generator based on the rainfall intensity, the rated rotating speed and a first calculation formula; wherein the first calculation formula is: n = n N －K i * Ri; or calculating the maximum rotating speed of the wind driven generator based on the rainfall intensity, the rated rotating speed and a second calculation formula; wherein the second calculation formula is: n = n N －K i *Ri 2 N is the maximum speed, K i Is a proportionality coefficient, n N Ri is the rainfall intensity.
Further, an embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein the step of determining a rainfall intensity threshold value based on the rainfall intensity and the maximum rotation speed includes: determining a rainfall intensity threshold value based on the rainfall intensity, the maximum rotating speed and a third calculation formula; wherein the third calculation formula is: ric = (n) N －n*)/K ic (ii) a Or, determining based on the rainfall intensity, the maximum rotating speed and a fourth calculation formulaA rainfall intensity threshold; wherein the fourth calculation formula is: ric = ((n) N －n*)/K ic ) 0.5 Ric is the rainfall intensity threshold, n is the maximum rotation speed, n N At a rated rotation speed, K ic Is a scaling factor.
Further, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, wherein, when the rainfall intensity reaches the rainfall intensity threshold, the step of performing the speed reduction control on the wind turbine based on the rainfall intensity includes: determining a maximum rainfall intensity threshold based on the rainfall intensity and the maximum rotation speed; when the rainfall intensity is greater than the rainfall intensity threshold value and less than or equal to the maximum rainfall intensity threshold value, carrying out speed reduction control on the wind driven generator based on the maximum rotating speed; and when the rainfall intensity is greater than or equal to the maximum rainfall intensity threshold value, controlling the wind driven generator to stop rotating.
Further, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, wherein the step of determining a maximum rainfall intensity threshold value based on the rainfall intensity and the maximum rotation speed includes: calculating a maximum rainfall intensity threshold value of the wind driven generator based on the rainfall intensity, the maximum rotating speed and a fifth calculation formula; the fifth calculation formula is: ric _ max = (n) N －n*)/K ic_max (ii) a Or calculating a maximum rainfall intensity threshold of the wind driven generator based on the rainfall intensity, the maximum rotating speed and a sixth calculation formula; the sixth calculation formula is: ric _ max = ((n) N －n*)/K ic_max ) 0.5 (ii) a Ric _ max is the maximum rainfall intensity threshold, n is the maximum rotation speed, n N At a rated rotation speed, K ic_max Is a scaling factor.
Further, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where the step of obtaining a rainfall intensity of an environment in which the wind turbine is located includes: monitoring the rainfall of the environment where the wind driven generator is located in real time based on rainfall measurement equipment; the rainfall measurement equipment is arranged on a cabin cover of the wind driven generator; determining the intensity of rainfall based on the amount of rainfall.
In a second aspect, an embodiment of the present invention further provides a device for controlling erosion and rain prevention of a wind turbine blade, including: the acquisition module is used for acquiring the rainfall intensity of the environment where the wind driven generator is located; and the control module is used for judging whether the rainfall intensity exceeds a rainfall intensity threshold value or not, and if so, carrying out speed reduction control on the wind driven generator based on the rainfall intensity.
In a third aspect, an embodiment of the present invention provides a wind turbine, including: the rainfall measuring device comprises a rainfall measuring device, a controller and a fan main body, wherein the controller comprises a processor and a storage device; the rainfall measurement equipment is arranged on a cabin cover of the wind driven generator; the storage means has stored thereon a computer program which, when executed by the processor, performs the method of any of the first aspects.
In a fourth aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, performs the steps of the method according to any one of the above first aspects.
The embodiment of the invention provides a rain erosion prevention control method and device for blades of a wind turbine generator and a wind turbine generator.
Additional features and advantages of embodiments of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of the invention as set forth above.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 shows a flow chart of a method for controlling rain erosion prevention of a wind turbine blade according to an embodiment of the present invention;
FIG. 2 illustrates a schematic diagram of a blade erosion control scheme according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a wind turbine generator according to an embodiment of the present invention;
FIG. 4 illustrates a flow chart of a blade erosion control scheme provided by an embodiment of the present invention;
fig. 5 shows a schematic structural diagram of a rain erosion prevention control device for a wind turbine blade according to an embodiment of the present invention.
Icon:
31-a rainfall measuring device; 32-a processor unit; 33-control system, 34-nacelle cover; 35-meteorological support.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, not all, embodiments of the present invention.
At present, the diameter of an impeller of a wind turbine generator in a large megawatt and low wind speed area is continuously increased, the linear speed of the blade tip of a blade reaches nearly 90m/s, and if raindrops act on the position of the blade tip in rainy days, the blade can be greatly impacted. When raindrops with a diameter of 2mm hit the blade surface, the water pressure is close to 140Mpa. At such speeds, the raindrops hit the coating like a bullet, causing damage to the protective layer, followed by rain washing away the remaining coating like a high-pressure washer, and in the worst case the basic structure of the blade is exposed to the outside or damaged. The power grade of an offshore wind turbine is high, blades are longer, the current grid-connected operation reaches 10MW grade, the current grid-connected operation reaches 14MW grade, an impeller exceeds 200m, a single blade reaches 100m grade, the blade tip speed is high, and the blade can bear large rainwater impact corrosion.
In view of the problem that blades of wind driven generators in the prior art are easily corroded by rain impact, in order to improve the problem, the embodiment of the invention provides a rain erosion prevention control method and device for blades of wind driven generators and a wind driven generator. The following describes embodiments of the present invention in detail.
The embodiment provides a method for controlling rain erosion prevention of a wind turbine blade, which is applied to a wind driven generator, and with reference to a flow chart of the method for controlling rain erosion prevention of the wind turbine blade shown in fig. 1, the method mainly includes the following steps S102 to S104:
and S102, acquiring the rainfall intensity of the environment where the wind driven generator is located.
The wind driven generator comprises rainfall measurement equipment and a controller, wherein the rainfall measurement equipment can be installed on a meteorological installation support of the cabin cover or can be directly installed on the cabin cover through a self support so as to measure a rainfall value in real time.
Monitoring rainfall of an environment where the wind driven generator is located in real time based on rainfall measuring equipment, sending the rainfall obtained through real-time measurement to a controller by the rainfall measuring equipment, determining rainfall intensity in real time based on the rainfall by the controller, wherein the rainfall intensity refers to the average rainfall within a certain duration and can be represented by the rainfall depth in unit time, the rainfall intensity = the rainfall/the rainfall duration, and different rainfall intensities are represented by different numerical values, wherein the numerical value is larger when the rainfall intensity is larger, such as the rainfall within 12 hours is smaller than 5 millimeters, or the rainfall within 24 hours is smaller than 10 millimeters; the rainfall is 5-14.9 mm within 12 hours in the case of medium rain, or 10-24.9 mm within 24 hours; the rainfall is 15-29.9 mm in 12 hours in heavy rain, or 25-49.9 mm in 24 hours.
And step S104, judging whether the rainfall intensity exceeds a rainfall intensity threshold value, and if so, performing speed reduction control on the wind driven generator based on the rainfall intensity.
Whether the rainfall intensity obtained through current calculation is larger than a rainfall intensity threshold value or not is judged based on a controller in the wind driven generator, if the rainfall intensity obtained through current calculation is larger than the rainfall intensity threshold value, the rainfall intensity at the moment is larger, rainfall under the rainfall intensity can generate larger corrosion to blades of the fan, in order to guarantee the safety of the fan and prolong the service life of the blades, the rotating speed of the wind driven generator is controlled to be reduced based on the rainfall intensity, so that the impact of rainwater on the blades is reduced, the corrosion degree of the rainwater on the blades is reduced, the service life of the blades is prolonged, and the safety of the wind driven generator is improved.
According to the rain erosion prevention control method for the blades of the wind turbine generator, the rainfall intensity of the environment where the wind turbine generator is located is obtained, whether the rainfall intensity exceeds the current rainfall intensity threshold value which can be borne by the wind turbine generator or not can be accurately judged, the rotating speed of the wind turbine generator is controlled when the rainfall intensity exceeds the current rainfall intensity threshold value, the rotating speed of impellers of the wind turbine generator can be controlled, the linear speed of blade tips is reduced, further the impact effect of raindrops on the blades is reduced, and the rain erosion degree of the blades is reduced.
In order to increase the power generation amount as much as possible and reduce the erosion of the blades by the rainwater when the rainfall intensity is large, the present embodiment provides an implementation manner of determining whether the rainfall intensity exceeds the rainfall intensity threshold, and if so, performing the speed reduction control on the wind turbine generator based on the rainfall intensity, and specifically referring to the following steps (1) to (3):
step (1): the maximum rotational speed of the wind turbine is determined based on the intensity of rainfall.
According to the rainfall intensity obtained by calculation, calculating a current rotating speed control instruction set value, and limiting the maximum rotating speed of the impeller, wherein the rotating speed control instruction set value can be the maximum rotating speed of the wind driven generator under the current rainfall intensity, and under the normal condition, the larger the rainfall intensity is, the smaller the rotating speed control instruction set value is, and the maximum rotating speed (rotating speed control instruction set value) and the rainfall intensity can be in a linear corresponding relation or a quadratic equation relation.
In one embodiment, the rated rotation speed of the wind driven generator is obtained; calculating the maximum rotating speed of the wind driven generator based on the rainfall intensity, the rated rotating speed and a first calculation formula; wherein the first calculation formula is: n = n N －K i * Ri. n is the maximum rotation speed, K i Is a proportionality coefficient of n N Ri is the rainfall intensity for the rated speed.
In another embodiment, the maximum rotating speed of the wind driven generator is calculated based on the rainfall intensity, the rated rotating speed and a second calculation formula; wherein the second calculation formula is: n = n N －K i *Ri 2 N is the maximum rotation speed, K i Is a proportionality coefficient, n N Ri is the rainfall intensity for the rated speed.
Step (2): and determining a rainfall intensity threshold value based on the rainfall intensity and the maximum rotating speed.
And the controller calculates a rainfall intensity threshold value according to the rainfall intensity calculation obtained through calculation and the maximum rotating speed under the rainfall intensity, wherein the rainfall intensity threshold value refers to a rainfall intensity set value allowed by the current wind turbine generator operating state.
In one embodiment, the rainfall intensity threshold is determined based on the rainfall intensity, the maximum rotation speed and a third calculation formula; wherein the third calculation formula is: ric = (n) N －n*)/K ic . Ric is the rainfall intensity threshold, n is the maximum rotation speed, n N At a rated speed, K ic Is a scaling factor.
In another embodiment, the rainfall intensity threshold value is determined based on the rainfall intensity, the maximum rotating speed and a fourth calculation formula; wherein the fourth calculation formula is: ric = ((n) N －n*)/K ic ) 0.5 Ric is the rainfall intensity threshold, n is the maximum rotation speed, n N At a rated speed, K ic Is a scale factor.
And (3): and when the rainfall intensity reaches a rainfall intensity threshold value, carrying out speed reduction control on the wind driven generator based on the rainfall intensity.
First, a maximum rainfall intensity threshold is determined based on rainfall intensity and maximum rotational speed. The maximum rainfall intensity threshold refers to the maximum rainfall intensity which can be borne by the current wind turbine generator in the operating state.
In one embodiment, the maximum rainfall intensity threshold value of the wind driven generator is calculated based on the rainfall intensity, the maximum rotating speed and a fifth calculation formula; the fifth calculation formula is: ric _ max = (n) N －n*)/K ic_max . Ric _ max is the maximum rainfall intensity threshold, n is the maximum rotation speed, n N At a rated speed, K ic_max Is a scale factor.
In another embodiment, the maximum rainfall intensity threshold value of the wind driven generator is calculated based on the rainfall intensity, the maximum rotating speed and a sixth calculation formula; the sixth calculation formula is: ric _ max = ((n) N －n*)/K ic_max ) 0.5 (ii) a Ric _ max is the maximum rainfall intensity threshold, n is the maximum rotation speed, n N At a rated rotation speed, K ic_max Is a scaling factor. The above-mentioned each proportionality coefficient can be determined according to the actual running state of the wind turbine generator, and the relation of the above-mentioned each proportionality coefficient is: k ic ＞K i ＞K ic_max 。
And then, judging the relationship between the rainfall intensity obtained by current calculation and the rainfall intensity threshold and the maximum rainfall intensity threshold, and performing speed reduction control on the wind driven generator according to the section where the rainfall intensity obtained by current calculation is located so as to reduce the corrosion degree of rainwater on the blades to the maximum extent and not influence the power generation of the wind turbine generator.
And when the rainfall intensity is greater than the rainfall intensity threshold and less than or equal to the maximum rainfall intensity threshold, carrying out speed reduction control on the wind driven generator based on the maximum rotating speed so as to enable the current rotating speed of the wind driven generator to be less than or equal to the maximum rotating speed. And if the rainfall intensity obtained by current calculation is smaller than the rainfall intensity threshold value, the actual current rainfall intensity is in the range allowing the wind turbine generator to normally work, the wind turbine generator is normally controlled to operate, and rain erosion prevention control does not need to be started. If the rainfall intensity obtained by the current calculation is greater than the rainfall intensity threshold value and less than or equal to the maximum rainfall intensity threshold value, the current rainfall intensity is larger than the normal allowable rainfall intensity but not exceeds the maximum allowable rainfall intensity, a controller of the wind driven generator starts rain erosion prevention control, namely, the wind driven generator is subjected to rotating speed reduction control, so that the rotating speed of the wind driven generator is reduced to the maximum rotating speed obtained by the calculation according to the rainfall intensity or is reduced to a rotating speed value less than the maximum rotating speed, the rotating speed of the impeller is reduced, the tip speed is reduced, the impact force of rainwater on the blades is reduced, and the corrosion degree of the rainwater on the blades is reduced.
And when the rainfall intensity is greater than or equal to the maximum rainfall intensity threshold value, controlling the wind driven generator to stop rotating. And if the rainfall intensity obtained by the current calculation exceeds the maximum value of the allowable rainfall intensity, controlling the wind turbine generator to stop and not run so as to avoid the influence of strong rain erosion on the blades of the wind turbine generator and ensure the safety of the wind turbine generator.
The rain erosion prevention control method for the blades of the wind turbine generator set, provided by the embodiment, provides an effective means for a rain erosion prevention control measure for the blades of the large-megawatt large-impeller wind turbine generator set, realizes accurate measurement of rainfall based on rainfall measurement equipment installed on an engine room, reduces the rain erosion damage degree of the blades by combining rainfall monitoring and blade rotating speed control, prolongs the service life of the blades, and ensures the quality and the running power generation performance of the blades of the wind turbine generator set.
On the basis of the foregoing embodiment, this embodiment provides an example of performing rain erosion prevention control on a wind turbine generator by using the rain erosion prevention control method for a wind turbine generator blade, and may specifically refer to the following steps 1) to 3):
step 1): referring to the schematic diagram of the blade rain erosion control shown in fig. 2, the rainfall measuring device transmits the measured rainfall value real-time value to the processor unit through data line communication, and the processor unit calculates the rainfall intensity according to the rainfall and sends the rainfall intensity to the control system.
Referring to the schematic structural diagram of the wind turbine generator shown in fig. 3, the wind turbine generator includes a rainfall measurement device 31, a processor unit 32 and a control system 33, the rainfall measurement device 31 may be mounted on a weather mounting bracket 35 of a nacelle cover 34, the weather mounting bracket 35 is mounted on the nacelle cover or directly mounted on the nacelle cover through a self-supporting bracket to measure a rainfall value in real time, and the measured rainfall value is subjected to data processing and calculation by the controller processing unit to obtain an effective rainfall and rainfall intensity.
The rainfall measurement device is a device capable of measuring rainfall, and includes, but is not limited to, a siphon rain gauge, a dump box rain gauge, a piezoelectric rain sensor, or the like.
Step 2): the control system calculates a current rainfall intensity threshold value Ric and a rainfall intensity maximum threshold value Ric _ max according to the rainfall intensity, and sends out a control instruction to the execution mechanism based on the current fan rotating speed, the rainfall intensity, the current rainfall intensity threshold value Ric and the rainfall intensity maximum threshold value Ric _ max.
The control system calculates a current set value of the rotating speed control instruction according to the rainfall intensity and the rainfall amount calculated by the processor unit, wherein the set value of the rotating speed control instruction is a value comprehensively judged and set according to the current unit running state, the environmental measurement data and the current rainfall intensity, and the larger the rainfall intensity is, the smaller the set value of the rotating speed control instruction is in general. The set value of the rotating speed control instruction and the rainfall intensity can be in a linear corresponding relation, a quadratic equation relation or other relational equations, and can also be determined according to the running state of the unit and a blade rain erosion program. And the control system issues the calculated given rotating speed instruction value to an execution mechanism to control the wind turbine generator to adjust the rotating speed, and the maximum rotating speed of the impeller is limited.
Referring to the blade rain erosion prevention control flow chart shown in fig. 4, the wind turbine generator control system calculates the current rainfall intensity threshold value Ric and the rainfall intensity maximum threshold value Ric _ max according to the current operating data and the environmental measurement data and by combining the rainfall intensity. The rainfall intensity threshold value Ric refers to a rainfall intensity set value allowed by the current wind turbine generator operating state, and is smaller than the rainfall intensity maximum threshold value Ric _ max. Environmental measurement data includes, but is not limited to, wind speed, wind direction, temperature, humidity, and the like.
As shown in fig. 4, the control system performs comprehensive judgment according to the rainfall intensity Ri and the rainfall Rf calculated by the processor unit, and the calculated rainfall intensity threshold value Ric and the rainfall intensity maximum threshold value Ric _ max, and performs the start and the stop of the anti-rain control or the stop of the wind turbine:
a) And if Ri < Ric, the actually measured rainfall intensity is in an allowed working range interval, the wind turbine generator is normally controlled to operate, and the rain erosion prevention control does not need to be started.
b) If Ric is less than or equal to Ri and less than Ric _ max, the actually measured rainfall intensity is larger than the normal allowable rainfall intensity but does not exceed the maximum allowable rainfall intensity, at the moment, the wind turbine generator starts to perform rain erosion prevention control, a rotating speed reduction control measure is adopted, the rotating speed of the impeller is reduced, and the speed of the blade tip is reduced on the inlet side.
n*＝n N －K i *Ri(Ric≤Ri<Ric _ max) or n × = nN-Ki × Ri2 (Ric ≦ Ri
Ri<Ric _ max), n is a given value of a rotating speed control command, ri is rainfall intensity, ki is a proportionality coefficient, n N Is the rated speed, ric is the rainfall intensity threshold, and Ric _ max is the rainfall intensity maximum threshold.
c) If Ri is larger than or equal to Ric _ max, the actually measured rainfall intensity exceeds the maximum allowable rainfall intensity, and at the moment, the wind turbine generator is shut down and does not operate any more, so that the influence of strong rain erosion on the blades of the wind turbine generator is avoided.
And step 3): and the executing mechanism of the wind driven generator controls the rotating speed of the wind driven generator set based on the control instruction.
According to the rain erosion prevention control method for the wind turbine generator, the rainfall measurement device is installed, the rain erosion prevention control algorithm for the blades is designed, the impeller rotating speed of the wind turbine generator is controlled according to the size and the change of the rainfall intensity, the linear speed of blade tips is reduced, the impact effect of raindrops on the blades is further reduced, the rain erosion degree of the blades is reduced, and the safe reliability and the performance of the operation of the blades of the wind turbine generator are guaranteed.
Corresponding to the rain erosion prevention control method for the wind turbine blade provided in the foregoing embodiment, an embodiment of the present invention provides a rain erosion prevention control device for a wind turbine blade, and referring to a schematic structural diagram of a rain erosion prevention control device for a wind turbine blade shown in fig. 5, the device includes the following modules:
the obtaining module 51 is configured to obtain rainfall intensity of an environment where the wind turbine is located.
And the control module 52 is configured to determine whether the rainfall intensity exceeds a rainfall intensity threshold, and if so, perform speed reduction control on the wind turbine generator based on the rainfall intensity.
The rain erosion prevention control device for the blades of the wind turbine generator provided by the embodiment can accurately judge whether the rainfall intensity exceeds the current rainfall intensity threshold value which can be borne by the wind turbine generator through acquiring the rainfall intensity of the environment where the wind turbine generator is located, and control the rotating speed of the wind turbine generator when the rainfall intensity exceeds the current rainfall intensity threshold value, so that the rotating speed of the impeller of the wind turbine generator can be controlled, the linear speed of the blade tip is reduced, further the impact effect of raindrops on the blades is reduced, and the rain erosion degree of the blades of the rainwater is reduced.
In one embodiment, the control module 52 is further configured to determine a maximum rotation speed of the wind turbine based on the rainfall intensity; determining a rainfall intensity threshold value based on the rainfall intensity and the maximum rotating speed; and when the rainfall intensity reaches a rainfall intensity threshold value, carrying out speed reduction control on the wind driven generator based on the rainfall intensity.
In one embodiment, the control module 52 is further configured to obtain a rated rotation speed of the wind turbine; calculating the maximum rotating speed of the wind driven generator based on the rainfall intensity, the rated rotating speed and a first calculation formula; wherein the first calculation formula is: n = n N －K i * Ri; or calculating the maximum rotating speed of the wind driven generator based on the rainfall intensity, the rated rotating speed and a second calculation formula; wherein the second calculation formula is: n = n N －K i *Ri 2 N is the maximum rotation speed, K i Is a proportionality coefficient of n N Ri is the rainfall intensity for the rated speed.
In one embodiment, the control module 52 is further configured to determine a rainfall intensity threshold value based on the rainfall intensity, the maximum rotation speed, and a third calculation formula; wherein the third calculation formula is: ric = (n) N －n*)/K ic (ii) a Or determining a rainfall intensity threshold value based on the rainfall intensity, the maximum rotating speed and a fourth calculation formula; wherein the fourth calculation formula is: ric = ((n) N －n*)/K ic ) 0.5 Ric is the rainfall intensity threshold, n is the maximum rotation speed, n N At a rated rotation speed, K ic Is a scaling factor.
In one embodiment, the control module 52 is further configured to determine a maximum rainfall threshold value based on the rainfall and the maximum rotation speed; when the rainfall intensity is greater than the rainfall intensity threshold value and less than or equal to the maximum rainfall intensity threshold value, carrying out speed reduction control on the wind driven generator based on the maximum rotating speed; and when the rainfall intensity is greater than or equal to the maximum rainfall intensity threshold value, controlling the wind driven generator to stop rotating.
In an embodiment, the control module 52 is further configured to calculate a maximum rainfall threshold of the wind turbine based on the rainfall, the maximum rotation speed, and a fifth calculation formula; the fifth calculation formula is: ric _ max = (n) N －n*)/K ic_max (ii) a Or calculating the maximum rainfall intensity threshold of the wind driven generator based on the rainfall intensity, the maximum rotating speed and a sixth calculation formula; the sixth calculation formula is: ric _ max = ((n) N －n*)/K ic_max ) 0.5 (ii) a Ric _ max is the maximum rainfall intensity threshold, n is the maximum rotation speed, n N At a rated speed, K ic_max Is a scaling factor.
In an embodiment, the obtaining module 51 is further configured to monitor rainfall of an environment where the wind turbine is located in real time based on a rainfall measuring device; the rainfall measurement equipment is arranged on an engine room cover of the wind driven generator; the rainfall intensity is determined based on the rainfall.
The rain erosion prevention control device for the blades of the wind turbine generator provided by the embodiment provides an effective means for rain erosion prevention control measures for the blades of the large-megawatt large-impeller wind turbine generator, realizes accurate measurement of rainfall based on rainfall measurement equipment installed on an engine room, reduces the rain erosion damage degree of the blades by combining rainfall monitoring and blade rotating speed control, and ensures the quality and the running power generation performance of the blades of the wind turbine generator.
The device provided by the embodiment has the same implementation principle and technical effect as the foregoing embodiment, and for the sake of brief description, reference may be made to the corresponding contents in the foregoing method embodiment for the portion of the embodiment of the device that is not mentioned.
An embodiment of the present invention provides a wind turbine, including: the rainfall measuring device comprises rainfall measuring equipment, a controller and a fan main body, wherein the controller comprises a processor and a storage device; the rainfall measurement device is arranged on a cabin cover of the wind driven generator. The storage means has stored thereon a computer program which, when being executed by the processor, carries out the steps of the method as provided by the above embodiments.
Embodiments of the present invention provide a computer-readable medium, wherein the computer-readable medium stores computer-executable instructions, which, when invoked and executed by a processor, cause the processor to implement the method of the above-mentioned embodiments.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the system described above may refer to the corresponding process in the foregoing embodiments, and is not described herein again.
The method and the device for controlling rain erosion of the blades of the wind turbine generator and the computer program product of the wind turbine generator provided by the embodiments of the present invention include a computer readable storage medium storing program codes, instructions included in the program codes may be used to execute the method described in the foregoing method embodiments, and specific implementation may refer to the method embodiments, and will not be described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
The functions may be stored in a computer-readable storage medium if they are implemented in the form of software functional units and sold or used as separate products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (5)
1. A rain erosion prevention control method for a wind turbine blade is characterized by comprising the following steps:
s102, acquiring rainfall intensity of the environment where the wind driven generator is located;
s104, judging whether the rainfall intensity exceeds a rainfall intensity threshold value, and if so, carrying out speed reduction control on the wind driven generator based on the rainfall intensity;
the step S104 includes:
s1041, determining the maximum rotating speed of the wind driven generator based on the rainfall intensity;
s1042, determining a rainfall intensity threshold value based on the rainfall intensity and the maximum rotating speed;
s1043, when the rainfall intensity reaches the rainfall intensity threshold value, performing speed reduction control on the wind driven generator based on the rainfall intensity;
the step S1041 includes:
acquiring the rated rotating speed of the wind driven generator;
calculating the maximum rotating speed of the wind driven generator based on the rainfall intensity, the rated rotating speed and a first calculation formula, wherein the first calculation formula is as follows: n + n = n N －K i * Ri; or calculating the maximum rotating speed of the wind driven generator based on the rainfall intensity, the rated rotating speed and a second calculation formula, wherein the second calculation formula is as follows: n = n N －K i *Ri 2 N is the maximum speed, K i Is a proportionality coefficient of n N The rated rotating speed is set, and Ri is the rainfall intensity;
step S1042 includes:
determining a rainfall intensity threshold value based on the rainfall intensity, the maximum rotating speed and a third calculation formula, wherein the third calculation formula is as follows: ric = (n) N －n*)/K ic (ii) a Or determining a rainfall intensity threshold value based on the rainfall intensity, the maximum rotating speed and a fourth calculation formula,wherein the fourth calculation formula is: ric = ((n) N －n*)/K ic ) 0.5 Ric is the rainfall intensity threshold, n is the maximum rotation speed, n N At a rated speed, K ic Is a proportionality coefficient;
step S1043 includes:
s10431, determining a maximum rainfall intensity threshold value based on the rainfall intensity and the maximum rotating speed; the method comprises the following steps: calculating a maximum rainfall intensity threshold value of the wind driven generator based on the rainfall intensity, the maximum rotating speed and a fifth calculation formula, wherein the fifth calculation formula is as follows: ric _ max = (n) N －n*)/K ic_max (ii) a Or calculating a maximum rainfall intensity threshold of the wind driven generator based on the rainfall intensity, the maximum rotating speed and a sixth calculation formula; the sixth calculation formula is: ric _ max = ((n) N －n*)/K ic_max ) 0.5 (ii) a Ric _ max is the maximum rainfall intensity threshold, n is the maximum rotation speed, n N At a rated speed, K ic_max Is a proportionality coefficient;
s10432, when the rainfall intensity is greater than the rainfall intensity threshold and less than or equal to the maximum rainfall intensity threshold, performing speed reduction control on the wind driven generator based on the maximum rotating speed;
s10433, when the rainfall intensity is larger than or equal to the maximum rainfall intensity threshold value, controlling the wind driven generator to stop rotating;
wherein, K ic ＞K i ＞K ic_max 。
2. The method of claim 1, wherein the step of obtaining the rainfall intensity of the environment in which the wind turbine is located comprises:
monitoring the rainfall of the environment where the wind driven generator is located in real time based on rainfall measurement equipment; the rainfall measurement equipment is arranged on a cabin cover of the wind driven generator;
determining the intensity of rainfall based on the amount of rainfall.
3. A wind turbine blade rain erosion prevention control device is characterized by being applied to the wind turbine blade rain erosion prevention control method of claim 1 or 2; the rain erosion prevention control device includes:
the acquisition module is used for acquiring the rainfall intensity of the environment where the wind driven generator is located;
and the control module is used for judging whether the rainfall intensity exceeds a rainfall intensity threshold value or not, and if so, carrying out speed reduction control on the wind driven generator based on the rainfall intensity.
4. A wind power generator, comprising: the rainfall measuring device comprises a rainfall measuring device, a controller and a fan main body, wherein the controller comprises a processor and a storage device; the rainfall measurement equipment is arranged on a cabin cover of the wind driven generator;
the storage device has stored thereon a computer program which, when executed by the processor, performs the method of claim 1 or 2.
5. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of claim 1 or 2.
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| CN110649842B (en) * | 2018-06-27 | 2021-08-13 | 北京金风科创风电设备有限公司 | Control method, device and system of wind generating set and storage medium |
| CN110985311A (en) * | 2019-11-19 | 2020-04-10 | 李思佳 | Wind power generation equipment capable of preventing blades from being corroded by acid rain |
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