CN114580192B - Method and device for calculating cut-in wind speed and rated wind speed of fan - Google Patents
Method and device for calculating cut-in wind speed and rated wind speed of fan Download PDFInfo
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- CN114580192B CN114580192B CN202210255887.3A CN202210255887A CN114580192B CN 114580192 B CN114580192 B CN 114580192B CN 202210255887 A CN202210255887 A CN 202210255887A CN 114580192 B CN114580192 B CN 114580192B
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Abstract
The invention discloses a method and a device for calculating cut-in wind speed and rated wind speed of a fan, wherein the method comprises the steps of adopting actual fitting power curve data of the fan, calculating a slope inflection point by judging the slope of a power curve based on the S-shaped shape characteristic of the power curve, and thus obtaining the cut-in wind speed and the rated wind speed; the cut-in wind speed and the rated wind speed are positioned at two inflection points of the S-shaped power curve. The method has high robustness, does not influence the subsequent calculation result because of deviation of model fitting, and has strong accuracy; the method eliminates the problems of terrain, wind resources and the like which are not considered by a standard power curve, accurately identifies each fan, and realizes one machine and one strategy; in addition, the method has the advantages of low cost, high efficiency, high calculation speed and the like.
Description
Technical Field
The invention relates to the technical field of wind power, in particular to a method and a device for calculating cut-in wind speed and rated wind speed of a fan.
Background
The cut-in and rated wind speed of the wind generating set are important basic indexes for analyzing various fields of machinery, data and the like of the set. In the prior art, the cut-in and rated wind speed of the fan are mainly obtained by the following methods:
(1) And directly using factory cut-in and rated wind speed as decision and subsequent calculation. In this method, the cut-in and rated wind speed of the fan of the same model are determined by the host manufacturer when the host manufacturer is designed and delivered from the wind farm, and design boundary conditions such as wind conditions in the wind farm area are not fully considered. In practice, the climate conditions of a wind farm are complex and variable, the wind resources and the like acquired by each fan are unequal, and the use of the same set of cut-in and rated wind speed can cause inaccurate analysis results for a single fan. In addition, because the wind conditions in different wind speed intervals are extremely irregular, the unit is frequently started and stopped in the wind speed interval due to the fact that cut-in and rated wind speed setting are unreasonable when the unit is delivered from a factory, the impact of starting current and repeated actions of a grid-connected switch can have adverse effects on the stability of the unit, and the faults of the unit are increased.
(2) The approximate cut-in and rated wind speed were observed by the human eye using the unprocessed wind speed-power scattergram. The fans of the wind field are often huge in size, the accuracy rate is low when the cut-in and rated wind speed are observed by naked eyes, the labor cost is greatly increased, and the working efficiency is reduced.
(3) After the factory wind speed data is corrected by utilizing the wind direction angle cosine value, a least square model is used for fitting the data, the data with large deviation between the wind speed and the corresponding power in the data is removed, the data with the wind speed less than 5m/s and the power more than 0 is reserved, the data with the deviation between the power corresponding to the current wind speed and the standard power curve under the wind speed larger than 50% is removed, and finally the third quantile of the residual wind speed data is used as the cut-in wind speed. In the method, the least square model is used for fitting the wind power curve, the accuracy is affected, and meanwhile, the method is slow in model design and calculation speed, high in cost, incapable of calculating rated wind speed and limited to a certain extent.
Therefore, it is obvious that the conventional method for calculating the cut-in wind speed and the rated wind speed of the wind turbine still has inconvenience and defects, and further improvement is urgently needed. How to create a method and a device for calculating the cut-in wind speed and the rated wind speed of a fan, which have the advantages of high accuracy, low cost, high efficiency and high calculation speed, becomes an object which is in great need of improvement in the industry at present.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a device for calculating the cut-in wind speed and the rated wind speed of a fan, which have the advantages of high accuracy, low cost, high efficiency and high calculation speed, so that the defects of the prior art are overcome.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for calculating the cut-in wind speed and the rated wind speed of a fan comprises the steps of adopting fitting power curve data of the fan, calculating a slope inflection point by judging the slope of a power curve based on the S-shaped shape characteristic of the power curve, and obtaining the cut-in wind speed and the rated wind speed; the cut-in wind speed and the rated wind speed are positioned at two inflection points of the S-shaped power curve.
As a further improvement of the invention, the method specifically comprises the following steps:
s1, obtaining a fitted power curve; s2, dividing a rising section of the S-shaped power curve into a first half section and a second half section based on the S-shaped shape characteristic of the fitted power curve; s3, by judging the slopes of the power curves of the front half section and the rear half section, keeping all data with the slope of the front half section being more than or equal to 5, and selecting the minimum index corresponding value as the cut-in wind speed; all data with the slope more than 0 and less than or equal to 5 in the second half section are reserved, and the corresponding value of the minimum index is selected as the rated wind speed; the minimum index corresponding value is: the first of the retained data, indexing its corresponding wind speed value.
Further, S1 specifically is: s11, acquiring actual power generation data of the fan after deep cleaning and filtering, wherein the actual power generation data comprises wind speed and power data; and S12, dividing the wind speed interval by step length, wherein the step length is 0.1-1m/S, and calculating the median of the power in each interval to obtain a preliminary fitting power curve.
Further, the step size is 0.2m/s.
Further, after S12, S13, judging whether the data of the preliminary fitting power curve has a value of which the power is more than or equal to rated power x 0.9; if so, smoothing the curve through a filter, and performing linear interpolation on the curve before the wind speed is cut to obtain a final fitting power curve; if not, the curve is regarded as not reaching the full hair, and a prompt of not reaching the full hair and being incapable of calculating is given.
Further, the S2 specifically is: s21, calculating a wind speed value corresponding to the median of the power values of the fitted power curve; and S22, dividing the power curve into a first half section and a second half section according to the wind speed value.
Further, the S3 specifically is: s31, calculating the slope of each piece of data of the two sections of curve data; s32, reserving all data with the slope not less than 5 in the first half section of data; s33, judging whether data with the slope of more than 0 and less than or equal to 5 exist in the second half-period data, and if so, keeping all data with the slope of more than 0 and less than or equal to 5; if not, the curve is regarded as not reaching the full hair, and a prompt of 'not reaching the full hair, unable to calculate' is given; s34, selecting the minimum index corresponding value from the data meeting the requirements in the first half section to obtain the cut-in wind speed, and selecting the minimum index corresponding value from the data meeting the requirements in the second half section to obtain the rated wind speed.
The invention also provides a device for calculating the cut-in wind speed and the rated wind speed of the fan, which comprises the following components: one or more processors; and the storage device is used for storing one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors realize the calculation method of the cut-in wind speed and the rated wind speed of the wind turbine.
By adopting the technical scheme, the invention at least has the following advantages:
1. the accuracy is high: according to the method, actual fitting power curve data of the fan is directly used for calculation, based on the shape characteristic of the power curve, the slope inflection point is calculated by judging the slope of the power curve, and therefore the cut-in and rated wind speed is obtained, the robustness is high, and the influence on subsequent calculation results due to deviation of model fitting is avoided; the method has strong accuracy and can accurately calculate the last two decimal points. And the method eliminates the problems of terrain, wind resources and the like which are not considered by a standard power curve, accurately identifies each fan, and realizes one machine and one strategy.
2. The labor cost is low, and the efficiency is high: the cut-in and rated wind speed of each fan can be automatically calculated in batches, data are stored, and the follow-up use is facilitated, and a series of tedious work of drawing, checking and estimating manually is not needed.
3. The operation speed is fast, and the deployment cost is low: the method has clear and simple general principle, does not relate to complex algorithms such as model training and the like, has light-weight calculation, high calculation speed and convenient deployment, and improves the efficiency of developing subsequent analysis.
Drawings
The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description.
FIG. 1 is a flow chart of a method for calculating cut-in wind speed and rated wind speed of a wind turbine according to the present invention;
FIG. 2 is a graph illustrating exemplary cut-in wind speed and rated wind speed calculations.
Detailed Description
The embodiment provides a method for calculating the cut-in wind speed and the rated wind speed of a fan, which comprises the steps of adopting actual fitting power curve data of the fan, based on the S-shaped shape characteristic of a power curve, calculating a slope inflection point by judging the slope of the power curve, and thus obtaining the cut-in wind speed and the rated wind speed; the cut-in wind speed and the rated wind speed are positioned at two inflection points of the S-shaped power curve.
The basic principle of the method is as follows: because the shape of the power curve is like an S shape, the cut-in wind speed and the rated wind speed are just positioned at two inflection points of the S shape, the slope at the inflection point of the S shape is relatively gentle through observation, the slope approaches to a smaller value, the slope rapidly rises before and after the inflection point, the rising section of the S shape can be divided from the middle by utilizing the characteristic, an empirical parameter 5 is set, and the corresponding minimum index in the data with the identification slope less than or equal to 5 is the inflection point, namely the cut-in and rated wind speed values to be identified.
As shown in fig. 1, the specific steps of the above calculation method are as follows:
s1, obtaining a fitted power curve; the method specifically comprises the following steps:
s11, acquiring actual power generation data of the fan after deep cleaning and filtering, wherein the actual power generation data comprises wind speed and power data;
s12, dividing wind speed intervals by step length, wherein the step length is 0.1-1m/S, the preferred step length in the embodiment is 0.2m/S, and calculating the median of the power in each interval to obtain a primary fitting power curve; wherein, a group of data is arranged from small to large, and a number (or the average value of two numbers) in the middle is the median of the group of data.
S13, judging whether the data of the preliminary fitting power curve have a value of which the power is more than or equal to rated power x 0.9 or not; if so, smoothing the curve through a filter, and performing linear interpolation on the curve before the wind speed is cut to obtain a final fitting power curve; if not, the curve is regarded as not reaching the full hair, and a prompt of not reaching the full hair and being incapable of calculating is given.
S2, dividing the ascending section of the S-shaped power curve into a first half section and a second half section based on the S-shaped shape characteristic of the fitted power curve; the method specifically comprises the following steps:
s21, calculating a wind speed value corresponding to the median of the power values of the fitted power curve;
and S22, dividing the power curve into a first half section and a second half section according to the wind speed value.
S3, by judging the slopes of the power curves of the front half section and the rear half section, keeping all data with the slope of the front half section being more than or equal to 5, and selecting the minimum index corresponding value as the cut-in wind speed; all data with the slope more than 0 and less than or equal to 5 in the second half section are reserved, and the minimum index corresponding value is selected as the rated wind speed, and specifically:
s31, calculating the slope of each piece of data of the two sections of curve data;
s32, reserving all data with the slope not less than 5 in the first half section of data;
s33, judging whether data with the slope of more than 0 and less than or equal to 5 exist in the second half-period data, and if so, keeping all data with the slope of more than 0 and less than or equal to 5; if not, the curve is regarded as not reaching the full hair, and a prompt of 'not reaching the full hair, unable to calculate' is given;
s34, selecting a minimum index corresponding value from the first half section of data meeting the requirement to obtain the cut-in wind speed, namely selecting the first data from the first half section of data meeting the requirement (the slope is more than or equal to 5), and indexing the wind speed value corresponding to the data to obtain the cut-in wind speed; the rated wind speed is obtained by selecting the minimum index corresponding value from the data meeting the requirements in the second half, namely, the first data is selected from the data meeting the requirements in the second half (the slope is more than 0 and less than or equal to 5), and the wind speed value corresponding to the index data is the rated wind speed, and the result is shown in fig. 2.
In addition, corresponding to the above calculating method, the present embodiment further provides a wind turbine cut-in wind speed and rated wind speed calculating device, including: one or more processors; the storage device is used for storing one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors realize the wind turbine performance evaluation method. Since the arrangement of the hardware parts of the system is conventional in the art, it will not be described in detail here.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. A method for calculating the cut-in wind speed and the rated wind speed of a fan is characterized in that the actual fitting power curve data of the fan is adopted, and based on the S-shaped shape characteristic of a power curve, the slope of the power curve is judged to calculate a slope inflection point, so that the cut-in wind speed and the rated wind speed are obtained; the cut-in wind speed and the rated wind speed are positioned at two turning points of an S-shaped power curve; the method specifically comprises the following steps:
s1, obtaining a fitted power curve;
s2, dividing the ascending section of the S-shaped power curve into a first half section and a second half section based on the S-shaped shape characteristic of the fitted power curve;
s3, by judging the slopes of the power curves of the first half section and the second half section, keeping all data of which the slope of the first half section is more than or equal to 5, and selecting the minimum index corresponding value as the cut-in wind speed; all data with the slope more than 0 and less than or equal to 5 in the second half section are reserved, and the corresponding value of the minimum index is selected as the rated wind speed;
the minimum index corresponding value is: the first of the retained data, indexing its corresponding wind speed value.
2. The method for calculating the cut-in wind speed and the rated wind speed of the wind turbine according to claim 1, wherein S1 specifically comprises:
s11, acquiring actual power generation data of the fan after deep cleaning and filtering, wherein the actual power generation data comprises wind speed and power data;
and S12, dividing the wind speed interval by step length, wherein the step length is 0.1-1m/S, and calculating the median of the power in each interval to obtain a preliminary fitting power curve.
3. The method for calculating the cut-in wind speed and the rated wind speed of the wind turbine according to claim 2, wherein the step length is 0.2m/s.
4. The method for calculating the cut-in wind speed and the rated wind speed of the wind turbine according to claim 2, further comprising, after S12, S13:
judging whether the data of the preliminary fitting power curve has a value of which the power is more than or equal to rated power x 0.9 or not; if so, smoothing the curve through a filter, and performing linear interpolation on the curve before the wind speed is cut to obtain a final fitting power curve; if not, the curve is regarded as not reaching the full hair, and a prompt of not reaching the full hair and being incapable of calculating is given.
5. The method for calculating the cut-in wind speed and the rated wind speed of the wind turbine according to any one of claims 1 to 4, wherein S2 specifically comprises:
s21, calculating a wind speed value corresponding to the median of the power values of the fitted power curve;
and S22, dividing the power curve into a first half section and a second half section according to the wind speed value.
6. The method for calculating the cut-in wind speed and the rated wind speed of the wind turbine according to any one of claims 1 to 4, wherein S3 specifically comprises:
s31, calculating the slope of each piece of data of the two sections of curve data;
s32, all data with the slope not less than 5 in the first half section of data are reserved;
s33, judging whether data with the slope of more than 0 and less than or equal to 5 exist in the second half-period data, and if so, keeping all data with the slope of more than 0 and less than or equal to 5; if not, the curve is regarded as not reaching the full hair, and a prompt of 'not reaching the full hair, unable to calculate' is given;
s34, selecting the minimum index corresponding value from the data meeting the requirements in the first half section to obtain the cut-in wind speed, and selecting the minimum index corresponding value from the data meeting the requirements in the second half section to obtain the rated wind speed.
7. A device for calculating cut-in wind speed and rated wind speed of a fan is characterized by comprising:
one or more processors;
a storage device for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the method of calculating the cut-in wind speed and the rated wind speed of a wind turbine according to any one of claims 1 to 6.
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| CN108448625B (en) * | 2018-04-09 | 2020-09-11 | 中能电力科技开发有限公司 | Fan cut-in wind speed calculation method based on data driving |
| CN112665110B (en) * | 2020-12-22 | 2022-03-18 | 珠海格力电器股份有限公司 | Air conditioner control method and device and computer readable storage medium |
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