CN114398842A - Method for evaluating generated energy of operating wind power plant - Google Patents
Method for evaluating generated energy of operating wind power plant Download PDFInfo
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- CN114398842A CN114398842A CN202210018692.7A CN202210018692A CN114398842A CN 114398842 A CN114398842 A CN 114398842A CN 202210018692 A CN202210018692 A CN 202210018692A CN 114398842 A CN114398842 A CN 114398842A
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Abstract
The invention discloses a method for evaluating the generated energy of a running wind power plant, which is characterized in that wind measuring equipment is respectively erected at the 2D-4D front positions of windwheels of upwind wind turbines in different wind direction sectors of the wind power plant, so that wind measuring actual measurement data which are not influenced by wake flow in different wind directions of the wind power plant can be obtained, and the generated energy of each unit is calculated by using wind resource software. The problem that data and results are inaccurate due to the fact that the anemometer tower is arranged in a field and affected by wake flow of the fan is avoided, and more accurate data support is provided for a follow-up possible technical improvement scheme of the wind power field.
Description
Technical Field
The invention belongs to the technical field of wind turbines, and particularly relates to a method for evaluating the generated energy of an operating wind power plant.
Background
After the wind power plant is put into operation, the situation that the generated energy is low and the expected income cannot be achieved sometimes occurs, so that the owner hopes to improve the generated energy of the wind power plant by means of moving the wind turbine, heightening a tower barrel, replacing a long blade or increasing the upper pressure. Before a transformation scheme is provided, sometimes wind needs to be compensated again to evaluate the transformed power generation amount due to problems of early-stage wind measuring tower data loss or insufficient representativeness and the like. The existing wind power plant generated energy evaluation method is usually based on wind tower data in a wind power plant before a wind turbine is erected, however, because the wind turbine is arranged in an operating wind power plant, the wind tower is set in the plant and is inevitably influenced by wake flow of the wind turbine, so that the finally obtained prediction result is not accurate.
Disclosure of Invention
The invention aims to provide a method for evaluating the generated energy of an operating wind power plant, which aims to solve the problem that in the prior art, fans are arranged in the operating wind power plant, and a wind measuring tower is set in the plant and is inevitably influenced by the wake flow of the fans, so that the finally obtained prediction result is inaccurate.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for evaluating the generated energy of an operating wind power plant comprises the following steps:
dividing a wind power plant into four directions, and acquiring wind speed and wind direction data of the wind power plant in the four directions by using wind measuring equipment;
importing the wind speed and wind direction data into wind resource software, and correcting the terrain or parameters of the wind resource software by using the wind measurement actual measurement data;
creating a transfer function by using the wind speed and the wind direction of the wind measuring equipment and the wind speed and the wind direction of the engine room, and correcting the wind speed and the wind direction of the engine room by using the transfer function;
carrying out weighted average on the corrected wind direction of the engine room to obtain completely new wind direction data, dividing the wind power plant into four sectors according to the completely new wind direction data, and obtaining corrected wind speed and wind direction data of the engine room in each sector;
and importing the corrected wind speed and wind direction data of the engine room in each sector into wind resource software for simulation calculation to respectively obtain the generated energy of each machine position of the wind power plant, wherein the terrain and the parameters in the wind resource software are the terrain and the parameters corrected by the wind measurement actual measurement data.
Optionally, the wind power plant is divided into four directions according to angles of-45 degrees to 45 degrees, 45 degrees to 135 degrees, 135 degrees to 225 degrees and 225 degrees to 315 degrees.
Optionally, a specific method for acquiring wind speed and wind direction data in four directions of the wind farm by using wind measuring equipment is as follows:
performing terrain evaluation on the outermost unit in four directions of the wind power plant, and judging whether the unit is a complex terrain;
if the terrain is a platform terrain, selecting one set from four directions of the wind power plant, and installing wind measuring equipment at the 2D-4D position of the upwind direction of the selected set to measure wind, wherein D is the diameter of a wind wheel of the wind power plant;
and if the terrain is a complex terrain, performing CFD simulation on the wind power plant, selecting a set with optimal wind speed and wind direction correlation at the 2D-4D position of the wind direction and the position of a fan in the wind power plant in each of four directions according to the simulation result, and installing wind measuring equipment to measure wind.
Optionally, if the terrain is a complex terrain, the wind measurement data measured by the wind measurement equipment is corrected by using the relationship between the wind speed and the wind direction at the position of the wind measurement equipment and the wind speed and the wind direction at the position of the fan, which are obtained by CFD simulation.
Optionally, the wind measuring equipment includes a wind measuring tower, a vertical lidar and a cabin radar.
Optionally, the data acquisition time of the anemometry device is at least one month.
Optionally, the wind resource software includes WT, WindSim, WAsP, or WindPro.
Optionally, the transfer function is obtained by linear fitting; or firstly carrying out wind speed averaging in an interval according to the wind speed of 0.5m/s, and then connecting the wind speed averages in every two adjacent wind speed intervals to obtain a straight line which is the transfer function of the interval.
The invention has the following beneficial effects:
according to the method for evaluating the generated energy of the operating wind power plant provided by the embodiment of the invention, the wind measuring devices are respectively erected at the positions 2D-4D in front of the windwheels of the upwind wind turbines in the sectors with different wind directions of the wind power plant, so that the measured wind measuring data which are not influenced by wake flow in the wind power plant with different wind directions can be obtained, and the generated energy of each unit is calculated by using wind resource software. The problem that data and results are inaccurate due to the fact that the anemometer tower is arranged in a field and affected by wake flow of the fan is avoided, and more accurate data support is provided for a follow-up possible technical improvement scheme of the wind power field.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a method for estimating the power generation of a running wind farm according to an embodiment of the invention.
Fig. 2 is an installation schematic diagram of wind measuring equipment in the embodiment of the invention.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
As shown in FIG. 1, the invention provides a method for evaluating the power generation amount of a wind farm in operation, which comprises the following specific steps:
1) the wind farm is divided into four directions.
As an example, the present embodiment can be uniformly set according to the conditions of the field, and for example, the setting may be-45 ° to 45 °, 45 ° to 135 °, 135 ° to 225 °, and 225 ° to 315 °.
2) As shown in fig. 2, terrain evaluation is performed on the outermost unit in four directions of the wind farm, and whether the unit is a complex terrain is determined.
Optionally, if the wind power plant is a platform terrain, a set with the best wind measuring equipment condition is installed at the position 2D-4D of the wind direction of the wind power plant in each of the four directions of the wind power plant to measure wind, and the wind measuring data at the height of the measured hub is the wind direction and wind speed data at the hub of the wind turbine. And D is the diameter of the wind wheel of the wind turbine generator.
Optionally, if the terrain is a complex terrain, CFD simulation is performed on the wind power plant, and after the CFD simulation is finished, a set which has the optimal wind speed and wind direction correlation at the 2D-4D position of the wind direction and the position of the fan and can be provided with wind measuring equipment is selected from the four directions of the wind power plant to measure the wind. Meanwhile, the measured wind data measured by the wind measuring equipment is corrected by utilizing the relation between the wind speed and the wind direction at the position of the wind measuring equipment and the wind speed and the wind direction at the position of the fan, which is obtained by CFD simulation, so that the measured wind data measured by the wind measuring equipment can represent the measured wind data at the hub of the fan.
As an example, wind measuring equipment includes, but is not limited to, wind towers, vertical lidar, nacelle radars, and the like.
3) After the wind measuring equipment in the four directions is installed, the wind measuring equipment carries out data acquisition work, and the data acquisition time is at least one month. After the data is finished, the measured data is imported into wind resource software for simulation calculation, and the data of 2-3 wind measuring devices can be imported in batches to reversely deduce the wind speed data of the other 1-2 wind measuring positions. And comparing the simulation data with the actual measurement data, and adjusting the terrain or parameters in the wind resource software if the error is larger until the simulation data is consistent with the actual measurement data.
As an example, wind resource software includes, but is not limited to, WT, WindSim, WAsP, or WindPro, among others.
4) And establishing a transfer function of the wind speed and the wind direction by utilizing the wind speed and the wind direction of the wind measuring tower equipment and the wind machine cabin at the same time.
Specifically, the wind speed transfer function may be created by linear fitting as required, or wind speed averaging may be performed in an interval of wind speed 0.5m/s, and then wind speed averaging may be performed in each two adjacent wind speed intervals, and the straight line is the transfer function in the interval. The wind direction transfer function can also be obtained by linear fitting or averaging according to an interval of 10 degrees.
As an example, the linear fitting results in a relationship Y ═ k × X + b.
As an example, the corrected wind speed V is obtained by the interval methodfreeThe calculation formula of (2) is as follows:
in the formula:
Vnacelle,iand Vnacelle,i+1-interval average of nacelle wind speed in interval i and interval i + 1;
Vfree,iand Vfree,i+1-interval average of wind measuring devices in interval i and interval i + 1;
Vnacelle-an actual value of the nacelle anemometer;
Vfree-obtaining a corrected free stream wind speed using the actual measured nacelle wind speed and the actual measured wind speed of the wind measuring device.
5) And collecting SCADA data of four units in the last year, and correcting the wind speed and the wind direction of the engine room by using the transfer function of the wind speed and the wind direction of the engine room. And combining the corrected wind speed and wind direction of the engine room according to the data at the same time. And (2) obtaining brand new wind direction data according to the weighted average of the wind directions of the four units, dividing the wind power plant according to the four sectors in the step 1) according to the wind direction data, and sorting to obtain corrected wind speed and wind direction data of the four unit cabins in each sector.
6) And (3) sequentially importing the corrected wind speed and wind direction data of the four unit engine rooms into wind resource software for simulation calculation to obtain the generated energy of each fan of the wind power plant, wherein the terrain data and the parameters are consistent with those corrected in the step 3). And finally, the annual estimated power generation amount of each fan of the wind power plant is equal to the sum of the power generation amounts obtained through calculation of the wind speed and wind direction data of the engine room in the four sectors.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (8)
1. A method for evaluating the generated energy of an operating wind power plant is characterized by comprising the following steps:
dividing a wind power plant into four directions, and acquiring wind speed and wind direction data of the wind power plant in the four directions by using wind measuring equipment;
importing the wind speed and wind direction data into wind resource software, and correcting the terrain or parameters of the wind resource software by using the wind measurement actual measurement data;
creating a transfer function by using the wind speed and the wind direction of the wind measuring equipment and the wind speed and the wind direction of the engine room, and correcting the wind speed and the wind direction of the engine room by using the transfer function;
carrying out weighted average on the corrected wind direction of the engine room to obtain completely new wind direction data, dividing the wind power plant into four sectors according to the completely new wind direction data, and obtaining corrected wind speed and wind direction data of the engine room in each sector;
and importing the corrected wind speed and wind direction data of the engine room in each sector into wind resource software for simulation calculation to respectively obtain the generated energy of each machine position of the wind power plant, wherein the terrain and the parameters in the wind resource software are the terrain and the parameters corrected by the wind measurement actual measurement data.
2. The method for evaluating the power generation amount of the running wind power plant according to claim 1, characterized in that the wind power plant is divided into four directions according to the angles of-45 degrees, 45-135 degrees, 135-225 degrees and 225-315 degrees.
3. The method for evaluating the power generation amount of the operated wind power plant according to claim 1, wherein the specific method for acquiring the wind speed and wind direction data in four directions of the wind power plant by using the wind measuring equipment is as follows:
performing terrain evaluation on the outermost unit in four directions of the wind power plant, and judging whether the unit is a complex terrain;
if the terrain is a platform terrain, selecting one set from four directions of the wind power plant, and installing wind measuring equipment at the 2D-4D position of the upwind direction of the selected set to measure wind, wherein D is the diameter of a wind wheel of the wind power plant;
and if the terrain is a complex terrain, performing CFD simulation on the wind power plant, selecting a set with optimal wind speed and wind direction correlation at the 2D-4D position of the wind direction and the position of a fan in the wind power plant in each of four directions according to the simulation result, and installing wind measuring equipment to measure wind.
4. The method for evaluating the generated energy of the operated wind power plant according to claim 3, wherein if the terrain is a complex terrain, the wind measurement data measured by the wind measurement equipment is corrected by utilizing the relationship between the wind speed and the wind direction at the position of the wind measurement equipment and the wind speed and the wind direction at the position of the fan, which are obtained by CFD simulation.
5. The method for estimating electricity generation during operation of a wind farm according to claim 1, wherein the wind measuring equipment comprises a wind tower, a vertical lidar and a nacelle radar.
6. The method of estimating operating wind farm power generation according to claim 1, wherein the data collection time of the wind measuring device is at least one month.
7. The method of estimating operating wind farm power generation according to claim 1, wherein the wind resource software comprises WT, WindSim, WAsP, or WindPro.
8. The method for estimating power generation of an operating wind farm according to claim 1, wherein the transfer function is obtained by linear fitting; or firstly carrying out wind speed averaging in an interval according to the wind speed of 0.5m/s, and then connecting the wind speed averages in every two adjacent wind speed intervals to obtain a straight line which is the transfer function of the interval.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116167655A (en) * | 2023-02-14 | 2023-05-26 | 中节能风力发电股份有限公司 | Method, system and medium for evaluating power generation capacity based on radar short-term supplementary wind measurement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116167655A (en) * | 2023-02-14 | 2023-05-26 | 中节能风力发电股份有限公司 | Method, system and medium for evaluating power generation capacity based on radar short-term supplementary wind measurement |
| CN116167655B (en) * | 2023-02-14 | 2024-02-23 | 中节能风力发电股份有限公司 | Method, system and medium for evaluating power generation capacity based on radar short-term supplementary wind measurement |
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