Site requirement determination method

Abstract

To provide a site requirement determination method capable of suppressing the impact on an environment around an observation point.SOLUTION: A site requirement determination method that determines site requirements for a wind power generation facility by observing a wind speed in an observation target area in the atmosphere by using a wind speed observation device utilizing the Doppler effect, performs a preliminary observation that calculates a first wind speed value by the Doppler effect in a preliminary observation area within a range in which the wind speed observation device is installed at a predetermined observation point, and is narrower than the observation target area by the wind speed observation device, and performs an actual observation that calculates a second wind speed value by the Doppler effect in the observation target area by the wind speed observation device in which the wind speed observation device is installed at the observation point when the first wind speed value is determined to satisfy the site requirements.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a method for determining location requirements. [Background technology]

[0002] Since wind power generation uses wind force to generate electricity, a continuous wind speed above a certain value is a condition for installing wind power generation equipment. For this reason, meteorological observations, etc., were conducted to measure the wind speed above observation points as a preliminary survey for installing wind power generation equipment.

[0003] Patent Document 1 states that "a laser beam is emitted in multiple directions and the temporal change in the laser beam reflected at an observation point in a predetermined position is detected to determine the change in concentration of aerosols flowing through the observation point, and then the cross-correlation of the concentration change patterns is determined, and the movement direction and speed of the aerosols, i.e., wind direction and wind speed, are calculated based on the position of each observation point where a correlated pattern appears and its time delay." In other words, Patent Document 1 describes a LIDAR device (equivalent to a Doppler LIDAR) that measures the wind speed in the sky using aerosols in the atmosphere for meteorological observations, etc. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 1-250762 Summary of the Invention [Problem to be solved by the invention]

[0005] Conventionally, when wind speed measurement equipment is installed at the observation point of a wind power generation facility, wind speed measurement is performed using a Doppler LIDAR as described in Patent Document 1. However, Patent Document 1 does not describe performing two-stage observations, a preliminary observation and an actual observation, by tilting the laser light with two different deflection angles.

[0006] Conventional observation methods require conducting actual observations from the beginning, which means cutting down trees that obstruct wind speed measurements over a wide area around the wind power generation facility installation site. Cutting down trees incurs costs such as the cost of manual labor and the cost of transporting the cut trees from the installation site. If wind speed measurements determine that the observation site does not meet the site requirements for wind power generation facilities, the cost of cutting down trees will be wasted because more trees than necessary will have been cut down. This will also have an impact on the surrounding environment of the observation site.

[0007] The present invention was made in consideration of these circumstances, and aims to reduce the impact on the surrounding environment of the observation point by conducting wind speed observation in two stages: preliminary observation and actual observation. [Means for solving the problem]

[0008] The present invention is a location requirement determination method that uses a wind speed observation device that utilizes the Doppler effect to observe wind speeds in an observation area in the atmosphere and determine the location requirements for wind power generation facilities.The wind speed observation device is installed at a specified observation point, and preliminary observation is performed using the wind speed observation device in a preliminary observation area narrower than the observation area to calculate a first wind speed value using the Doppler effect.If it is determined that the first wind speed value meets the location requirements, the wind speed observation device is installed at the observation point, and actual observation is performed using the wind speed observation device in the observation area to calculate a second wind speed value using the Doppler effect. [Effects of the Invention]

[0009] According to the present invention, if it is determined that the wind speed value obtained by the preliminary observation satisfies the installation requirements for the wind power generation facility, it is possible to move on to actual observation. Problems, configurations, and effects other than those described above will become apparent from the following description of the embodiments. [Brief explanation of the drawings]

[0010] [Figure 1]FIG. 1 is a diagram showing a state of aerosol measurement using a Doppler LIDAR according to one embodiment of the present invention. [Figure 2] 1 is a flowchart illustrating an example of processing of a location requirement determination method according to one embodiment of the present invention. [Figure 3] FIG. 10 is a diagram showing an example of a felling area that is a small area centered on an observation point according to an embodiment of the present invention. [Figure 4] FIG. 10 is a diagram showing an example of a measurement range at a first polarization angle during preliminary observation according to one embodiment of the present invention. [Figure 5] 1 is a block diagram showing an example of the internal configuration of a Doppler LIDAR according to an embodiment of the present invention. FIG. [Figure 6] FIG. 10 is a diagram showing an example of data stored in a wind speed database at the end of preliminary observation according to one embodiment of the present invention. [Figure 7] FIG. 10 is a diagram showing an example of a cutting area that is a wide area centered on an observation point according to an embodiment of the present invention. [Figure 8] FIG. 10 is a diagram showing an example of a measurement range at a second polarization angle during actual observation according to an embodiment of the present invention. [Figure 9] 1 is a block diagram showing an example of the internal configuration of a Doppler LIDAR according to an embodiment of the present invention. FIG. [Figure 10] FIG. 10 is a diagram showing an example of data stored in a wind speed database at the end of actual observation according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In this specification and drawings, components having substantially the same functions or configurations are designated by the same reference numerals, and redundant description will be omitted.

[0012] [Premise] In order to install a wind power generation facility in an appropriate location, various requirements must be met. For example, environmental requirements include whether the location is located in a wildlife protection area and whether it violates the Aviation Act. Other requirements include whether the equipment components can be transported to the planned construction site of the wind power generation facility and whether the port for bringing in the equipment components is available. Furthermore, operational requirements must also be met, such as whether the wind power generation facility can generate sufficient power even after it is installed. To meet these operational requirements, wind speed values ​​must be obtained at the installation site of the wind power generation facility prior to installation to determine whether the facility is suitable for operation.

[0013] The wind speed observation device of one embodiment described below addresses these operational requirements and relates to a location requirement determination method for determining whether a target area is suitable for installing wind power generation equipment.

[0014] Wind speed observation devices that observe wind speed include, for example, Doppler LIDAR, which uses laser light as an emission wave, and Doppler SODAR, which uses sound waves as an emission wave. Both wind speed observation devices observe wind speed by calculating the frequency difference due to the Doppler effect between the emission wave emitted from the observation device and the reflected wave reflected from aerosols floating in the observation area in the atmosphere.

[0015] The site requirement determination method described below uses a wind speed observation device that utilizes the Doppler effect to observe wind speed in the atmospheric observation area to determine the site requirements for a wind power generation facility. This site requirement determination method determines the site requirements for a wind power generation facility by performing two stages of observation: preliminary observation and actual observation. In the preliminary observation, the wind speed observation device is installed at a specified observation point. The wind speed observation device calculates a first wind speed value using the Doppler effect in a preliminary observation area that is narrower than the observation area. If the wind speed observation device determines that the first wind speed value meets the site requirements for the wind power generation facility, it performs actual observation. In the actual observation, the wind speed observation device is also installed at a specified observation point. The wind speed observation device calculates a second wind speed value using the Doppler effect in the observation area. The site requirement determination method using a Doppler lidar is described in detail below.

[0016] [One embodiment] 1 is a diagram showing how aerosols 3 are measured using a Doppler lidar 1 according to one embodiment of the present invention (referred to as this embodiment). Here, the measurement of aerosols 3 performed in both preliminary observation and actual observation is shown.

[0017] As the wind speed observation device according to this embodiment, for example, a Doppler LIDAR 1 is used and installed at a predetermined observation point. The Doppler LIDAR 1 includes an optical system transmitting and receiving device 10 and a control device 20. The optical system transmitting and receiving device 10 includes prisms 11 and 13 (see FIGS. 4 and 8 described below) having predetermined polarization angles. Here, the prisms 11 and 13 are collectively referred to as "prisms."

[0018] When a user operates the Doppler LIDAR 1, the Doppler LIDAR 1 emits laser light while rotating the prism at a predetermined rotational speed. The laser light moves in a circular motion tilted by the polarization angle of the prism from the vertical direction, forming a cone-shaped observation area 2 with the observation point as its apex.

[0019] When scattered light from aerosols 3 floating in the observation area 2 is acquired, scattered light from aerosols 3 at heights other than the specified height is also included. Therefore, the control device 20 digitally converts the observation data contained in the scattered light and extracts observation data at a specified height position relative to the observation point at a specified sampling period. The control device 20 then calculates a wind speed value from the observation data. Thereafter, the control device 20 uses the calculated wind speed value to determine whether the target area satisfies the location requirements from an operational perspective, which is one of the requirements for installing wind power generation equipment.

[0020] The first prism 11 is used for preliminary observation, and the second prism 13 is used for actual observation. When switching from preliminary observation to actual observation, the first prism 11 and the first base 12 (see FIG. 4 described later) are replaced with the second prism 13 and the second base 14 (see FIG. 8 described later).

[0021] Before the preliminary observation, the Doppler LIDAR 1 is test-used. During the test use of the Doppler LIDAR 1, laser light is emitted through a prism and scattered light is received. However, if the prism is rotated too quickly, scattered light from high altitudes cannot be received. Conversely, if the prism is rotated too slowly, real-time wind direction measurement is lost. Therefore, during the test use, the rotation speeds of the first prism 11 and the second prism 13 are set so that the Doppler LIDAR 1 can accurately acquire scattered light from aerosols 3 at a predetermined height relative to the observation point. The rotation speed is set to a speed appropriate for calculating the time average of the frequency difference between the laser light emitted over a predetermined time period and the scattered light received over a predetermined time period. The first pedestal 12 and the second pedestal 14 are rotated so that the first prism 11 and the second prism 13 can rotate at the set rotation speeds.

[0022] Details of the location requirement determination method and an example of the configuration of the Doppler LIDAR 1 will be described below with reference to FIG. 2 and subsequent drawings.

[0023] FIG. 2 is a flowchart showing an example of the process of the location requirement determination method. In the process of the site requirement determination method, first, trees growing in a small area around an observation point that indicates a candidate site for installing a wind power generation facility are cut down (S1). Here, the area for cutting trees in the preliminary observation will be explained with reference to FIG.

[0024] FIG. 3 is a diagram showing an example in which a small area centered on an observation point is set as the felling area. Doppler LIDAR 1 is installed at the observation point. However, in the preliminary observation, it is not clear whether the observation point meets the site requirements for a wind power generation facility. There are trees surrounding the observation point. If left as is, the laser light emitted by Doppler LIDAR 1 will be blocked by the trees, making it impossible to observe the wind speed at the specified height.

[0025] For this reason, standing trees around the observation point are cut down within a narrow cutting range as shown in FIG. 3. The cutting range of standing trees is a range that does not obstruct the projection of laser light from the Doppler LIDAR 1 during preliminary observation. Prior to the projection of laser light, standing trees are cut down within a cutting area that corresponds to a first polarization angle (e.g., 15 degrees) with respect to the vertical direction of the Doppler LIDAR 1. This cutting range allows the laser light emitted by the Doppler LIDAR 1 to reach a predetermined height during preliminary observation. Furthermore, from an environmental perspective, it is essential that standing trees are cut down within as narrow an area as possible during preliminary observation.

[0026] Returning to the explanation of Figure 2. After the trees are cut down in step S1, preliminary observation is carried out at the observation point using the Doppler LIDAR 1 (S2). Here, the preliminary observation area 4 set during the preliminary observation will be described with reference to FIG.

[0027] FIG. 4 is a diagram showing an example of a measurement range at the first polarization angle during preliminary observation. In the preliminary observation, a first prism 11 is used in the Doppler LIDAR 1. The first prism 11 has a first polarization angle (15 degrees) with respect to the vertical direction.

[0028] The first prism 11 is mounted on a first pedestal 12. The first pedestal 12 can rotate in the direction indicated by the white arrow at a predetermined rotational speed, with the vertical direction as its rotation axis. The first prism 11 emits laser light while rotating in accordance with the predetermined rotational speed of the first pedestal 12. This forms a conical preliminary observation area 4 with the observation point as its apex. Note that the actual observation area 5, which will be described later, is indicated by a dashed line in Figure 4. The preliminary observation area 4 is smaller than the actual observation area 5.

[0029] When conducting preliminary observation, the first prism 11 is placed on the first inclined surface of the first pedestal 12, which has a first inclined surface with an inclination angle between 19.89 degrees and 23.89 degrees, and the first prism 11 is set in the Doppler LIDAR 1. The angle of the first pedestal 12 is determined according to the angle of the first prism 11. It is preferable that the inclination angle of the first inclined surface is 21.89 degrees.

[0030] Next, an example of the internal processing of the Doppler LIDAR 1 during preliminary observation will be described with reference to FIG. Fig. 5 is a block diagram showing an example of the internal configuration of the Doppler LIDAR 1. Fig. 5 shows an example of the configuration of functional blocks that perform processing from when the Doppler LIDAR 1 acquires the first scattered light to when it calculates the first wind speed value.

[0031] In the preliminary observation, the user installs a first prism 11 having a first polarization angle with respect to the vertical direction in the Doppler LIDAR 1. When the user operates the Doppler LIDAR 1, the first prism 11 rotates at a predetermined rotational speed while emitting laser light, thereby setting a conical preliminary observation area 4 with the observation point as its apex in the observation target area 2. In addition, the optical system transmitting and receiving device 10 acquires first scattered light from a first aerosol 3 floating in the preliminary observation area 4.

[0032] Next, the extraction process is executed. In the extraction process, the first scattered light and the laser light are input to pre-processing unit 15. Pre-processing unit 15 extracts the difference in frequency between the first scattered light and the laser light, and converts this difference into an electrical signal to generate a first difference signal. In this extraction process, the difference between the laser frequency of the laser light emitted from first prism 11 and the frequency of the first scattered light whose frequency has changed due to the Doppler effect is extracted.

[0033] The control device 20 includes an input / output unit 21, an A / D conversion unit 22, an extraction unit 23, a calculation unit 24, a wind speed database (denoted as wind speed DB in the drawing) 25, and a determination unit .

[0034] The input / output unit 21 receives the first differential signal. The A / D converter 22 converts the first differential signal received by the input / output unit 21 into digital data to generate preliminary observation data. The extraction unit 23 performs FFT (Fast Fourier Transform) analysis on preliminary observation data at a predetermined height position with the observation point as the reference at a predetermined sampling period to calculate frequencies and extract first observation data.

[0035] Next, the calculation process is executed. The calculation unit 24 performs calculation processing based on the first observation data input from the extraction unit 23. The first observation data is data acquired by tilting the laser beam by a first deflection angle from the vertical direction. Therefore, the calculation unit 24 multiplies the first observation data by the trigonometric function sin (first polarization angle) to convert it into a first horizontal direction signal. Thereafter, the calculation unit 24 multiplies the first horizontal direction signal by a first constant corresponding to the first polarization angle to calculate a first wind speed value. The predetermined calculation for the first wind speed value is as follows:

[0036] (1) Converting the first observation data into a first horizontal signal Since the Doppler frequency is a signal captured at the first polarization angle of 15 degrees by the first prism 11, the calculation unit 24 converts the first observation data into a first horizontal direction signal using the following equation (1).

[0037] (First horizontal signal) = sin(first polarization angle 15 degrees) × (first Doppler frequency) ... (1)

[0038] (2) Converting the first horizontal signal into a velocity signal (first wind speed value) The calculation unit 24 converts the first horizontal direction signal obtained by equation (1) into a velocity signal by using a first constant in the following equation (2).

[0039] (Velocity signal) = (First horizontal signal) x (First constant) = (first horizontal signal) × ((0.1 m / s) / (0.03346 MHz)) … (2)

[0040] Returning to the explanation of Figure 2. After the calculation unit 24 calculates the speed signal as a first wind speed value, the first wind speed value is stored in the wind speed database 25 in association with the observation date and time of the preliminary observation, the observation location, and the Doppler lidar 1 used for the preliminary observation (S3).

[0041] Next, the determination unit 26 determines whether the site requirements for the wind power generation facility are met based on the first wind speed value calculated in the preliminary observation (S4). The determination of the site requirements is performed by the processing of the determination unit 26, and this determination processing may be performed at the observation site, or may be carried out by bringing the results back to a management center or the like and performing a determination together with other observation sites.

[0042] The processing in determination unit 26 determines that the observation point satisfies the site requirements for wind power generation facilities (suitable) when the wind speed value included in the first wind speed value at the observation point is equal to or greater than a wind speed value indicating a preset and stored reference value (for example, 5 m / s) (YES in S4), and determines that the site requirements are not satisfied (unsuitable) when the wind speed value is less than the reference value (NO in S4).If it is determined that the observation point does not satisfy the site requirements for wind power generation facilities, no further actual observation is performed, and the wind speed observation ends.

[0043] Here, an example of the wind speed database 25 to which the results of the location determination in the preliminary observation have been added will be described. FIG. 6 is a diagram showing an example of data stored in the wind speed database 25 at the end of the preliminary observation.

[0044] The wind speed database 25 has the following items: observation point, preliminary observation date and time, first wind speed value [m / s], pass / fail result, actual observation date and time, and second wind speed value [m / s].

[0045] The observation point item stores, for example, a number or name as identification information of the point where the preliminary observation is performed. The preliminary observation date and time field stores the date and time when the preliminary observation was performed. The first wind speed value field stores the first wind speed value calculated in the preliminary observation. The item of the result of pass or fail stores the result of pass or fail of the observation point determined by the determination unit 26. If the observation point is determined to be pass or fail, "OK" is stored, and if it is determined to be unpass or fail, "NG" is stored.

[0046] The actual observation date and time field stores the date and time when the actual observation, which will be described later, is performed. The second wind speed value field stores a second wind speed value calculated from actual observation.

[0047] The candidate sites for the wind power generation facility are set as observation points, and points 1, 2, and 3 are stored in the observation point item of the wind speed database 25. Preliminary observations are made, and the calculated first wind speed values ​​are 8.2 m at point 1, 3.5 m at point 2, and 7.0 m at point 3.

[0048] The first wind speed values ​​calculated at points 1 and 3 are equal to or greater than the reference value, so they meet the site requirements for wind power generation facilities, the observation points are judged to be suitable, and "OK" is stored. On the other hand, the first wind speed value calculated at point 2 is less than the reference value, so it does not meet the site requirements for wind power generation facilities. Therefore, the observation point is judged to be unsuitable, and "NG" is stored.

[0049] Therefore, wind speed observation at point 2 will be completed with only preliminary observation without proceeding to actual observation, and actual observation will be carried out at points 1 and 3, as described below. Note that wind direction data may be stored in the wind speed database 25, and time-dependent changes in wind direction may also be recorded.

[0050] As described above, at point 2, only preliminary observation is completed, and no actual observation is conducted. Therefore, there is no need to cut down the large area of ​​standing trees (obstacles) required for actual observation. As a result, the area of ​​standing trees cut down for preliminary observation can be reduced to one-fourth of the area of ​​standing trees that would be cut down if a prism with a polarization angle of 30 degrees, which was used in conventional preliminary observation, were used, i.e., the prism used in actual observation with the wind speed observation device according to this embodiment, were used.

[0051] Returning to the explanation of Figure 2. At points 1 and 3 that are determined to be suitable in the wind speed database 25, standing trees are cut down over a wider area than in the preliminary observation before the actual observation (S5). The tree cutting area for the actual observation will now be described with reference to FIG. 7.

[0052] FIG. 7 is a diagram showing an example in which a wide area centered on an observation point is set as the felling area.

[0053] As shown in Figure 7, a Doppler LIDAR 1 is installed at the observation point. Before the actual observation, standing trees that would obstruct the laser light irradiation are cut down over a wide area corresponding to the second polarization angle at which the Doppler LIDAR 1 emits the laser light. The cutting range for the actual observation is set to be wider than the cutting range for the preliminary observation. If the cutting range for the actual observation is set to a diameter twice that of the cutting range for the preliminary observation, the cutting range for the actual observation will be four times that of the cutting range for the preliminary observation. As a result, the actual observation area 5 will be wider than the preliminary observation area 4.

[0054] After the trees are cut down, actual observation is carried out at the observation point using the Doppler LIDAR 1 (S6), as shown in Fig. 2. Here, the actual observation area 5 set during actual observation will be described with reference to Fig. 8.

[0055] FIG. 8 is a diagram showing an example of a measurement range at the second polarization angle during actual observation.

[0056] In actual observation, in order to accurately observe the wind speed at the observation point, a second prism 13 having a deflection angle of 30 degrees (referred to as the second deflection angle) is used in the Doppler LIDAR 1. The second prism 13 has a second deflection angle (30 degrees) with respect to the vertical direction.

[0057] When transitioning from preliminary observation to actual observation, an operator removes the first pedestal 12 on which the first prism 11 is mounted from the Doppler LIDAR 1. Then, the operator places the second prism 13 on the second inclined surface of the second pedestal 14, which has an inclination angle between 38.9 degrees and 42.9 degrees, and sets the second prism 13 on the Doppler LIDAR 1. The angle of the second pedestal 14 is determined according to the angle of the second prism 13. It is preferable that the inclination angle of the second inclined surface is 40.9 degrees.

[0058] The second prism 13 is mounted on a second pedestal 14. The second pedestal 14 is rotatable in the direction indicated by the white arrow at a predetermined rotational speed, with the vertical direction as its rotation axis. The second prism 13 emits laser light while rotating in accordance with the predetermined rotational speed of the second pedestal 14. This forms a conical actual observation area 5 with the observation point as its apex. The actual observation area 5 is larger than the preliminary observation area 4 shown in the figure for comparison.

[0059] Next, an example of the internal processing of the Doppler LIDAR 1 during actual observation will be described with reference to FIG. Fig. 9 is a block diagram showing an example of the internal configuration of the Doppler LIDAR 1. Fig. 9 shows an example of the configuration of functional blocks that perform processing from when the Doppler LIDAR 1 acquires the second scattered light to when it calculates the second wind speed value. The control device 20 shown in Fig. 9 does not include the determination unit 26 shown in Fig. 5.

[0060] In the actual observation stage, a second prism 13 having a second polarization angle with respect to the vertical direction is installed in the Doppler LIDAR 1. When the user operates the Doppler LIDAR 1, the second prism 13 rotates at a predetermined rotational speed while emitting laser light, thereby setting a conical actual observation area 5 with the observation point as the apex in the observation target area 2. In addition, the optical system transmitting and receiving device 10 acquires second scattered light from a second aerosol 3 floating in the actual observation area 5.

[0061] Next, the extraction process is executed. The second scattered light and the laser light are input to pre-processing unit 15. Pre-processing unit 15 extracts the difference in frequency between the second scattered light and the laser light, and converts this difference into an electrical signal to generate a second difference signal. In this extraction process, the difference between the laser frequency of the laser light emitted from second prism 13 and the frequency of the second scattered light whose frequency has changed due to the Doppler effect is extracted.

[0062] The input / output unit 21 receives the second differential signal. The A / D converter 22 converts the second differential signal received by the input / output unit 21 into digital data to generate actual observation data. The extraction unit 23 performs FFT (Fast Fourier Transform) analysis on actual observation data at a predetermined height position with the observation point as the reference at a predetermined sampling period to calculate frequencies and extract second observation data.

[0063] Next, the calculation process is executed. The calculation unit 24 performs calculation processing based on the second observation data input from the extraction unit 23. The second observation data is data acquired by tilting the laser light by a second deflection angle from the vertical direction. Therefore, the calculation unit 24 multiplies the second observation data by the trigonometric function sin (second polarization angle) to convert it into a second horizontal direction signal. Thereafter, the calculation unit 24 multiplies the second horizontal direction signal by a second constant corresponding to the second polarization angle to calculate a second wind speed value. The predetermined calculation for the second wind speed value is as follows:

[0064] (3) Converting the second observation data into a second horizontal signal Since the Doppler frequency is a signal captured at the second polarization angle of 30 degrees by the second prism 13, the calculation unit 24 converts the second observation data into a second horizontal direction signal using the following equation (3).

[0065] (Second horizontal signal) = sin(second polarization angle 30 degrees) × (second Doppler frequency) ... (3)

[0066] (4) Converting the second horizontal signal into a speed signal (second wind speed value) The calculation unit 24 converts the second horizontal direction signal obtained by equation (3) into a velocity signal by using the second constant in the following equation (4).

[0067] (Velocity signal) = (Second horizontal signal) x (Second constant) = (second horizontal signal) × ((0.1 m / s) / (0.064641 MHz)) … (4)

[0068] After the calculation unit 24 calculates the speed signal as a second wind speed value, the second wind speed value is stored in the wind speed database 25 in association with the observation date and time of the actual observation, the observation location, and the Doppler LIDAR 1 used for the actual observation (S7), and the wind speed observation is terminated.

[0069] Here, an example of the wind speed database 25 to which the results of location determination based on actual observations have been added will be described. FIG. 10 is a diagram showing an example of data stored in the wind speed database 25 at the end of actual observation.

[0070] When actual observation is performed, values ​​are stored in the wind speed database 25 for the actual observation date and time and the second wind speed value. Actual observation is performed, and the calculated second wind speed values ​​are 8.3 m at point 1 and 6.2 m at point 3. Note that actual observation was not performed at point 2 because it was determined to be unsuitable in the preliminary observation. The second wind speed values ​​calculated at points 1 and 3 are equal to or greater than the wind speed value indicating the reference value (for example, a wind speed of 5 m / s), and therefore both satisfy the site requirements for wind power generation facilities. Note that the reference values ​​in the preliminary observation and actual observation may be the same or different values.

[0071] In wind observation using the Doppler LIDAR 1 according to the present embodiment described above, when laser light is emitted from the Doppler LIDAR 1 at a predetermined height, it is necessary to cut down standing trees that become obstacles. However, by performing two-stage observation, it is possible to determine the appropriate area for cutting down standing trees.

[0072] That is, in the preliminary observation, the first prism 11 with a small polarization angle is used to narrow the irradiation range of the laser light, thereby reducing the area to be cut down. If it is determined that the observation point does not meet the site requirements for wind power generation facilities, the observation is terminated at this stage. If it is determined in the preliminary observation that the observation point meets the site requirements for wind power generation facilities, a larger area of ​​standing trees is cut down and obstacles are removed in order to move on to actual observation. Therefore, it is possible to reduce the cost of cutting down trees without cutting down more than necessary.

[0073] Furthermore, by conducting wind speed observations in two stages, a preliminary observation and an actual observation, if the preliminary observation determines that the site is unsuitable, the area of ​​standing trees that must be cut down can be reduced to, for example, about one-fourth of the conventional amount. This is a major advantage of the site requirement determination method according to this embodiment.

[0074] The first polarization angle of the first prism 11 is set to 15 degrees, and the second polarization angle of the second prism 13 is set to 30 degrees. By switching between prisms with set polarization angles in this way for preliminary observation and actual observation, it is possible to accurately set the preliminary observation area 4 and the actual observation area 5. This makes it possible to maintain consistency in the wind speeds measured at multiple points.

[0075] In addition, in the preliminary observation and the actual observation, various indices other than wind speed may be used to determine the site requirements. For example, the site requirements may be determined based on wind direction, weather, ground conditions, etc.

[0076] The present invention is not limited to the above-described embodiment, and it goes without saying that various other applications and modifications are possible without departing from the gist of the present invention as set forth in the claims. For example, the above-described embodiment has described the system configuration in detail and specifically to clearly explain the present invention, and is not necessarily limited to a system including all of the described configurations. Furthermore, it is also possible to add, delete, or replace part of the configuration of this embodiment with other configurations. In addition, the control lines and information lines shown are those that are considered necessary for the explanation, and do not necessarily show all the control lines and information lines in the product. In reality, it can be assumed that almost all components are interconnected. [Explanation of symbols]

[0077] 1... Doppler lidar, 4... preliminary observation area, 5... actual observation area, 10... optical system transmitting and receiving device, 11... first prism, 12... first base, 13... second prism, 14... second base, 15... pre-processing unit, 20... control device, 21... input / output unit, 22... A / D conversion unit, 23... extraction unit, 24... calculation unit, 25... wind speed database, 26... determination unit

Claims

1. A site requirement determination method for determining site requirements for a wind power generation facility by observing wind speeds in an observation area in the atmosphere using a wind speed observation device that utilizes the Doppler effect, installing the wind speed observation device at a predetermined observation point, and performing preliminary observation using the wind speed observation device in a preliminary observation area narrower than the observation target area to calculate a first wind speed value using the Doppler effect; If it is determined that the first wind speed value satisfies the location requirements, the wind speed observation device is installed at the observation point, and actual observation is performed in the observation target area using the wind speed observation device to calculate a second wind speed value using the Doppler effect. Method for determining location requirements.

2. In the preliminary observation, a first prism having a first polarization angle with respect to the vertical direction is installed in the wind speed observation device, the wind speed observation device is operated, and laser light is emitted while the first prism is rotated at a predetermined rotation speed, thereby setting the preliminary observation area in a cone shape with the observation point as its apex, and first scattered light from a first aerosol floating in the preliminary observation area is acquired. The method for determining location requirements according to claim 1 .

3. In the preliminary observation, the standing trees are cut down within a cutting area range corresponding to the first polarization angle in a stage prior to the irradiation of the laser light so that the standing trees around the observation point do not become an obstacle when the laser light is irradiated. The method for determining location requirements according to claim 2.

4. In the extraction process, the first scattered light and the laser light are input to a preprocessing unit, which extracts a difference in frequency between the first scattered light and the laser light and converts the difference into an electrical signal to generate a first differential signal, which is taken into the control device via an input / output unit of the control device, which digitally converts the first differential signal into preliminary observation data in an A / D conversion unit to generate preliminary observation data, and which performs FFT analysis on the preliminary observation data at a predetermined height position relative to the observation point at a predetermined sampling period to calculate a frequency and extract first observation data. The method for determining location requirements according to claim 3.

5. In the calculation process, the first observation data is input to a calculation unit, the first observation data is multiplied by sin (first polarization angle) to convert it into a first horizontal direction signal, and the first horizontal direction signal is multiplied by a first constant ((0.1 m / s) / (0.03346 MHz)) corresponding to the first polarization angle to calculate a first wind speed value. The method for determining location requirements according to claim 4.

6. The first wind speed value is stored in a wind speed database in association with the observation date and time of the preliminary observation and the observation point. The method for determining location requirements according to claim 5.

7. If the first wind speed value extracted from the wind speed database is equal to or greater than a reference value, it is determined that the location requirements are met and the actual observation is started, and if the first wind speed value is less than the reference value, it is determined that the location requirements are not met and the wind speed observation is ended without starting the actual observation. The method for determining location requirements according to claim 6.

8. The first prism is placed on a first inclined surface of a first base having a first inclined surface with an inclination angle between 19.89 degrees and 23.89 degrees, and the first prism is set in the wind speed observation device. The method for determining location requirements according to claim 7.

9. The first polarization angle is set to 15°. The method for determining location requirements according to claim 8.

10. A test use of the wind speed observation device is carried out in a stage prior to the preliminary observation, and the first prism is rotated at the rotation speed set so as to accurately obtain scattered light from aerosols at a predetermined height position relative to the observation point. The method for determining location requirements according to claim 2.

11. In the actual observation, a second prism having a second polarization angle with respect to the vertical direction is installed in the wind speed observation device, the wind speed observation device is operated, the second prism is rotated at a predetermined rotation speed while emitting laser light, a conical actual observation area with the observation point as an apex is set in the observation target area, and the second scattered light from the second aerosol floating in the actual observation area is acquired. The method for determining location requirements according to claim 1 .

12. In the actual observation, in order to prevent standing trees around the observation point from becoming an obstacle when the laser light is irradiated, the standing trees are cut down in an area wider than the cutting area in the preliminary observation before the laser light is irradiated. The method for determining location requirements according to claim 11.

13. In the extraction process, the second scattered light and the laser light are input to a preprocessing unit, a difference in frequency between the second scattered light and the laser light is extracted and the difference is converted into an electrical signal to generate a second differential signal, the second differential signal is taken into the control device through an input / output unit of the control device, the second differential signal is digitally converted in an A / D conversion unit to generate actual observation data, and an extraction unit performs FFT analysis on the actual observation data at a predetermined height position relative to the observation point from the actual observation data at a predetermined sampling period to calculate a frequency and extract the second observation data. The method for determining location requirements according to claim 12.

14. In the calculation process, the second observation data is input to a calculation unit, the second observation data is multiplied by sin (second polarization angle) to convert it into a second horizontal direction signal, and the second horizontal direction signal is multiplied by a second constant ((0.1 m / s) / (0.064641 MHz)) corresponding to the second polarization angle to calculate a second wind speed value. The method for determining location requirements according to claim 13.

15. The second wind speed value is stored in a wind speed database in association with the observation date and time of the actual observation and the observation point. The method for determining location requirements according to claim 14.

16. After removing the first base on which the first prism is mounted, the second prism is mounted on a second inclined surface of a second base having a second inclined surface with an inclination angle between 38.9 degrees and 42.9 degrees, and the second prism is set in the wind speed observation device. The method for determining location requirements according to claim 15.

17. The second polarization angle is set to 30°. The method for determining location requirements according to claim 16.

18. A test use of the wind speed observation device is carried out in a stage prior to the preliminary observation, and the second prism is rotated at the rotation speed set so as to accurately obtain scattered light from aerosols at a predetermined height position relative to the observation point. The method for determining location requirements according to claim 11.

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