A method and system for positioning wind turbine yaw direction

Abstract

The present invention relates to the field of wind power generation technology, and in particular to a method and system for positioning the yaw direction of a wind turbine, wherein the method comprises: obtaining sunlight; obtaining the deviation angle of an incident light beam relative to a reference direction based on the sunlight; calculating the current solar direction angle based on the point coordinates and the current time; and obtaining the geographic orientation angle of the cabin based on the deviation angle and the solar direction angle. The true geographic orientation angle of the sunlight at that moment is deduced through the solar trajectory formula, and the geographic orientation angle of the cabin is obtained based on the deviation angle and the geographic orientation angle. The measurement means used is sunlight, and its principle does not involve means that are susceptible to interference, such as magnetic fields and electric fields, and can avoid interference caused by the strong electric field and magnetic field environment of the cabin itself, and realize automatic and accurate output of the orientation geographic angle of the measurement equipment baseline.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and in particular to a method and system for positioning a wind turbine in the yaw direction. Background Art

[0002] At present, the development of the wind power industry has entered the stage of refined layout development from extensive development. The design of wind turbine locations needs to maximize the use of space resources, that is, to reasonably deploy a large number of wind turbines in a limited space to achieve the goal of maximizing comprehensive output. As a result, in reality, the turbulence generated by the front wind turbine will affect the wind turbines behind it in a certain wind direction, which may lead to a decrease in the power generation of the rear wind turbines, or even affect the safety of the operation of the rear wind turbines. This impact is particularly large in mountain wind farms. In view of this situation, wind farms have formulated rules for wind turbine sector management in operation management to reduce equipment safety problems caused by rotation. The measurement method for measuring the direction of the nacelle in the relevant embodiments is expensive, complex in construction, and has uncertain deviations, and has low accuracy. Summary of the invention

[0003] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0004] To this end, the first purpose of the present application is to propose a method for positioning the yaw direction of a wind turbine to solve the problems of the existing method for measuring the direction of the nacelle, such as high cost, complex construction, uncertain deviations, and low accuracy.

[0005] The second object of this application is to provide a system.

[0006] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a method for positioning a wind turbine in the yaw direction, comprising:

[0007] Get the sun's rays;

[0008] Acquire a deviation angle of an incident light beam relative to a reference direction based on the sunlight;

[0009] Calculate the current sun direction angle based on the point coordinates and current time;

[0010] The geographic orientation angle of the nacelle is acquired based on the deviation angle and the sun direction angle.

[0011] Preferably, acquiring the geographic orientation angle of the nacelle based on the deviation angle and the sun direction angle comprises:

[0012] Determine the magnitude of the deviation angle and the sun direction angle;

[0013] If the deviation angle is greater than the sun direction angle, the nacelle geographic orientation angle is the difference between the deviation angle and the sun direction angle;

[0014] If the deviation angle is smaller than the sun direction angle, the nacelle geographic orientation angle is 360 minus the difference between the deviation angle and the sun direction angle.

[0015] Preferably, obtaining the deviation angle of the incident light beam relative to a reference direction based on the sunlight comprises:

[0016] Taking sunlight as a parallel light source, when the light enters the device, it is projected onto another photosensitive element on the inner wall. The angle formed by the line connecting the two photosensitive elements and the device baseline is the deviation angle between the light and the device baseline. The deviation angle of the incident light beam relative to the reference direction is obtained by using the ratio of the serial number difference of the two photosensitive elements through which the light passes to the total number.

[0017] Preferably, the calculating the current sun direction angle based on the point coordinates and the current time comprises:

[0018] Get the solar declination angle based on the current time;

[0019] Calculating the solar zenith angle using the solar declination angle, solar hour angle and local latitude;

[0020] A solar azimuth angle is obtained based on the solar zenith angle.

[0021] Preferably, the solar zenith angle calculation formula is:

[0022]

[0023] The solar azimuth angle calculation formula is:

[0024]

[0025] in, is the local latitude, δ is the solar declination angle, ω is the solar hour angle, and α is the solar altitude angle.

[0026] The second embodiment of the present application provides a wind turbine yaw direction positioning system, including:

[0027] The cylindrical shell is made of a light-shielding film, and the wall has three vertical light-intake slits for capturing sunlight;

[0028] A photosensitive element is arranged around the bottom of the cylindrical shell and is used to capture the projection of the sunlight;

[0029] A positioning device, arranged at the bottom of the cylindrical housing, for obtaining geographic coordinate information and time information of the system installation point;

[0030] A processor is arranged at the bottom of the cylindrical housing, connected to the photosensitive element and the positioning device through a transmission device, and calculates the geographic orientation angle of the cabin based on the angle between the projection of the sunlight and the equipment baseline;

[0031] A storage device, connected to the processor, for storing and processing the geographic orientation angle of the cabin;

[0032] A power supply device is connected to the processor, the storage device, the positioning device and the photosensitive element, and is used to provide power.

[0033] Preferably, the central angle between every two adjacent slits on the cylindrical shell is 120 degrees. When the sun shines on the measuring device, light can only enter the device from two or one of the three slits. The light beam entering the device is projected as a line of light at the bottom of the device, which will be captured by the photosensors at both ends of the straight line.

[0034] Preferably, the photosensitive element has an internal number, and the angle between the light and the baseline is obtained by using the ratio of the serial number difference of the two photosensitive originals through which the light passes to the total number.

[0035] Preferably, the light can only enter the interior of the device through two or one of the three slits, including:

[0036] When the incident light is projected into the bottom of the device through the two light-entry slits and irradiates the four photosensitive elements of the two light-entry slits on the inner wall, the direction of the incident light is obtained using one of the two incident light rays;

[0037] When the incident light is projected into the bottom of the device through a light slit, it will illuminate two photosensitive elements in a light slit on the inner wall. The angle between the incident light and the measurement reference line can be calculated by the photosensitive element number.

[0038] Preferably, the equipment reference line is parallel to the central axis of the cabin.

[0039] The present application provides a method for positioning the yaw direction of a wind turbine. The true geographical direction angle of the sunlight at that moment is calculated through the sun trajectory formula, and the geographical orientation angle of the cabin is obtained based on the deviation angle and the geographical direction angle. The measurement means adopted is sunlight. The principle does not involve means that are susceptible to interference, such as magnetic fields and electric fields. It can avoid interference caused by the strong electric field and magnetic field environment of the cabin itself, and realize automatic and accurate output of the geographical angle of the direction of the measurement equipment baseline.

[0040] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0042] Figure 1 A flow chart of a first specific embodiment of a method for positioning a wind turbine in the yaw direction provided by the present invention;

[0043] Figure 2 This is the flow chart for measuring the yaw direction of the wind turbine;

[0044] Figure 3 It is a schematic diagram of the cross section of the measuring equipment;

[0045] Figure 4 It is the actual orientation angle diagram of the first device reference line;

[0046] Figure 5 It is the real orientation angle diagram of the second device reference line;

[0047] Figure 6 This is the structural diagram of the wind turbine yaw direction positioning system;

[0048] Figure 7 is a schematic diagram of the angle between an incident light and the baseline;

[0049] Figure 8 Schematic diagram of the angle between the two incident light rays and the baseline. DETAILED DESCRIPTION

[0050] The core of the present invention is to provide a method and system for positioning the yaw direction of a wind turbine, which obtains the geographical orientation angle of the cabin based on the deviation angle and the geographical direction angle, avoids interference from the strong electric field and magnetic field environment of the cabin itself, and realizes automatic and accurate output of the geographical angle of the direction of the baseline of the measurement equipment.

[0051] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0052] Please refer to Figure 1 , Figure 1 This is a flow chart of a first specific embodiment of a method for positioning the yaw direction of a wind turbine provided by the present invention; the specific operation steps are as follows:

[0053] Step S101: Acquire sunlight;

[0054] Step S102: obtaining a deviation angle of an incident light beam relative to a reference direction based on the sunlight;

[0055] The step of obtaining a deviation angle of the incident light beam relative to a reference direction based on the sunlight comprises:

[0056] Take sunlight as a parallel light source. When the light enters the device, it is projected onto another photosensitive element on the inner wall. The angle formed by the line connecting the two photosensitive elements and the device baseline is the deviation angle between the light and the device baseline. The deviation angle of the incident light beam relative to the reference direction is obtained by using the ratio of the serial number difference of the two photosensitive elements through which the light passes to the total number.

[0057] Step S103: Calculate the current sun direction angle based on the point coordinates and the current time;

[0058] The calculation of the current sun direction angle based on the point coordinates and the current time includes:

[0059] Get the solar declination angle based on the current time;

[0060] Calculating the solar zenith angle using the solar declination angle, solar hour angle and local latitude;

[0061] A solar azimuth angle is obtained based on the solar zenith angle.

[0062] The solar zenith angle calculation formula is:

[0063]

[0064] The solar azimuth angle calculation formula is:

[0065]

[0066] in, is the local latitude, δ is the solar declination angle, ω is the solar hour angle, and α is the solar altitude angle.

[0067] Step S104: acquiring the geographic orientation angle of the nacelle based on the deviation angle and the sun direction angle.

[0068] The acquiring of the geographic orientation angle of the nacelle based on the deviation angle and the sun direction angle comprises:

[0069] Determine the magnitude of the deviation angle and the sun direction angle;

[0070] If the deviation angle is greater than the sun direction angle, the nacelle geographic orientation angle is the difference between the deviation angle and the sun direction angle;

[0071] If the deviation angle is smaller than the sun direction angle, the nacelle geographic orientation angle is 360 minus the difference between the deviation angle and the sun direction angle.

[0072] This embodiment provides a method for positioning the yaw direction of a wind turbine. The true geographical direction angle of the sun's sunlight at that moment is calculated through the sun trajectory formula, and the geographical orientation angle of the cabin is obtained based on the deviation angle and the geographical direction angle. The measurement means adopted is sunlight, and its principle does not involve means that are easily interfered with, such as magnetic fields and electric fields. It can avoid interference caused by the strong electric field and magnetic field environment of the cabin itself, and realize automatic and accurate output of the geographical angle of the direction of the measurement equipment baseline.

[0073] Based on the above embodiment, this embodiment describes a method for positioning a wind turbine in the yaw direction. Figure 2 As shown, the details are as follows:

[0074] The core of this method is to obtain the deviation angle θ based on the angle between the direction of the light generated after the sunlight enters the sensitive element inside the measuring device and the reference direction inside the measuring device, and the direction information of the sun can be used to infer the true geographical direction angle β of the sunlight at that moment through the sun trajectory formula. Assuming the true orientation angle γ of the baseline of the measuring device, if θ≥β, then γ=θ-β; if θ≤β, then γ=360-(β-θ). In actual use, the baseline of the measuring device is installed parallel to the center axis of the cabin, and the geographical orientation angle γ of the cabin can be obtained at this time.

[0075] like Figure 3 As shown, 360 photosensitive elements are evenly distributed at the bottom of the measuring device, that is, one photosensitive element is distributed per degree; the measuring device baseline must pass through the photosensitive element at one of the light holes, and the numbering starts from the photosensitive element at the other end of the measuring device baseline, and then the 360 ​​photosensitive elements are numbered counterclockwise; after the incident light enters the measuring device through the light hole, the photosensitive element at the light hole and another photosensitive element on the inner wall of the device receive the photosensitive signal, and the numbers of these two photosensitive elements are taken; find the number of the photosensitive element where the incident light is finally projected inside the measuring device, if the number is greater than 180, then subtract the number from 360 to get the angle between the incident light and the measuring device baseline; if the number is less than 180, then subtract the number from 180 to get the angle between the incident light and the measuring device baseline. If there are two incident light rays, take the larger number of the photosensitive element that is finally projected.

[0076] The azimuth of the sun can be obtained through the sun trajectory formula. The input parameters are the geographical longitude and latitude of the measurement point and the measurement time information. Then the geographical azimuth angle of the direct sunlight from the sun at this location at this time can be obtained. The specific formula is as follows:

[0077] The formula for calculating the solar zenith angle is:

[0078]

[0079] The formula for calculating the solar azimuth is:

[0080]

[0081] in, is the local latitude, δ is the solar declination angle, ω is the solar hour angle, and α is the solar altitude angle;

[0082] The formula for calculating the solar hour angle is:

[0083] ω=(ST-12)*15

[0084] Among them, true solar time ST = Beijing time + 4*(120-local longitude), 120 is the longitude of Beijing, ST in the northern hemisphere is negative in the morning and positive in the afternoon.

[0085] E=229.183*(0.000043+0.002061*cos(B)-0.03204*sin(B)-0.014974*cos(2*B)-0.040685*sin(2*B))

[0086] B=(n-1)*360 / 365

[0087] Solar declination angle is calculated on a daily basis:

[0088] δ=0.006894-0.399512*cos(B)+0.072075*sin(B)-0.006799*cos(2*B)+0.000896*sin(2*B)-0.002689*cos(3*B)+0.001516*sin(3*B)

[0089] The solar hour angle and solar declination angle need to be converted into radians during the calculation process.

[0090] The device provided by this method has a built-in GPS and Beidou positioning system receiver, which can automatically obtain the geographical coordinate information and time information of the installation point. At the same time, the device also supports the function of manually entering the installation coordinates.

[0091] After obtaining the true geographic angle β of the direct incident light, determine the size relationship between θ and β. If θ ≥ β, then γ = θ - β; if θ < β, then γ = 360 - (β - θ), where the conversion process is as follows: Figure 4 , Figure 5 shown.

[0092] A method for positioning the yaw direction of a wind turbine is provided in an embodiment of the present invention. The method can realize automatic and accurate output of the geographical angle of the orientation of the measurement equipment baseline. When the installation is consistent with the center line of the cabin, the output is the geographical angle of the orientation of the cabin, thereby solving the problem of measuring the orientation angle of the cabin. The measurement means adopted is sunlight, and its principle does not involve means that are easily interfered with, such as magnetic fields and electric fields, and can avoid interference from the strong electric field and magnetic field environment of the cabin itself. The observation equipment adopted has a simple structure, is easy to install, and has a small size. It can be installed in different wind turbine cabins and can be used for multiple machines multiple times, thereby greatly reducing the cost of the wind farm for all wind turbines in the sector management process.

[0093] like Figure 6 As shown, based on the above embodiment, this embodiment describes a wind turbine yaw direction positioning system, including:

[0094] The cylindrical shell is composed of a light-shielding film, and the wall has three vertical light-intake slits for capturing sunlight. The central angle between each two adjacent slits on the cylindrical shell is 120 degrees. When the sun shines on the measuring device, the light can only enter the device from two or one of the three slits. The light beam entering the device is projected as a line of light at the bottom of the device, which will be captured by the photosensors at the beginning and end of the line. Three light-intake slits are designed on the light-shielding film on the wall of the measuring device. They can more intuitively detect the trajectory of the incident light after entering the measuring device. If there are more than three light-intake slits, there will be too much incident light, resulting in a larger workload for subsequent calculations. If there are less than three light-intake slits, sunlight will not be able to enter the measuring device under certain conditions, and the light will not be able to be measured.

[0095] Photosensitive elements are arranged around the bottom of the cylindrical shell to capture the projection of the sunlight. The photosensitive elements have internal numbers and use the ratio of the difference in serial numbers of the two photosensitive elements through which the light passes to the total number to obtain the angle between the light and the baseline.

[0096] When selecting and using photosensors, the following aspects need to be considered:

[0097] Photosensors are highly sensitive to light signals and can capture low-intensity light signals.

[0098] Fast response: Photosensitive elements can respond quickly to light signals, enabling high-speed data acquisition and processing.

[0099] Low power consumption: Photosensitive components usually have low power consumption characteristics and can work under the requirements of energy saving and environmental protection.

[0100] A positioning device, arranged at the bottom of the cylindrical housing, for obtaining geographic coordinate information and time information of the system installation point;

[0101] A processor is arranged at the bottom of the cylindrical housing, connected to the photosensitive element and the positioning device through a transmission device, and calculates the geographic orientation angle of the cabin based on the angle between the projection of the sunlight and the equipment baseline;

[0102] The sun is far away from the measuring device and the receiver area is small, so the sunlight can be treated as a parallel light source. After the light enters the device, it is projected onto another photosensitive element on the inner wall. The angle between the line connecting the two photosensitive elements and the baseline is the deviation angle between the light and the device baseline. The photosensitive element at the bottom has an internal number. The angle between the light and the baseline can be calculated by the ratio of the difference in the serial numbers of the two photosensitive elements passed by the light to the total number.

[0103] like Figure 7 , Figure 8 As shown, there are two cases when the incident light enters the light-entry slits. The first case: the incident light is projected from a certain direction through two light-entry slits into the bottom of the device, and irradiates a total of four photosensitive elements in front and behind the two light-entry holes on the inner wall. At this time, the direction of the light is determined by any one of the two incident light rays (the two incident light rays are parallel). The other type of incident light is projected into the bottom of the device through a light-entry hole. At this time, only two photosensitive elements will receive the incident light. The angle between the incident light and the measurement reference line can be calculated by the following photosensitive element numbers.

[0104] The method for measuring the deviation angle is mainly to capture and measure the direction of the incident light through two photosensitive elements. This step is to obtain the angle θ between the incident sunlight and the measurement reference line.

[0105] A storage device, connected to the processor, for storing and processing the geographic orientation angle of the cabin;

[0106] A power supply device is connected to the processor, the storage device, the positioning device and the photosensitive element, and is used to provide power.

[0107] A wind turbine yaw direction positioning system provided by an embodiment of the present invention calculates the angle between sunlight and a baseline inside a measuring device, and solves the geographical angle of the device baseline by combining the angle between sunlight and the device baseline with the geographical azimuth angle of the sun, thereby automatically and accurately outputting the geographical angle of the device baseline. The measuring means adopted by the present invention is sunlight, and its principle does not involve means susceptible to interference such as magnetic fields and electric fields, and can avoid interference caused by the strong electric field and magnetic field environment of the cabin itself. The observation equipment of this system has a simple structure, is easy to install, and has a small size. It can be installed in different wind turbine cabins and can be used for multiple machines multiple times, which greatly reduces the cost of sector management for all wind turbines in a wind farm.

[0108] In order to implement the above embodiments, the present application also proposes an electronic device, comprising: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the method provided by the above embodiments.

[0109] In order to implement the above embodiments, the present application also proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the methods provided by the above embodiments.

[0110] In order to implement the above embodiments, the present application also proposes a computer program product, including a computer program, which implements the methods provided by the above embodiments when executed by a processor.

[0111] The collection, storage, use, processing, transmission, provision and disclosure of user personal information involved in this application are in compliance with relevant laws and regulations and do not violate public order and good morals.

[0112] It should be noted that personal information from users should be collected for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign the agreement / authorization including authorization of relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others who have access to personal information data comply with its privacy policy and procedures.

[0113] The present application is expected to provide an implementation scheme for users to selectively block the use or access of personal information data. That is, the present disclosure is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, the risk can be minimized by limiting data collection and deleting the data. In addition, when applicable, such personal information is de-identified to protect the privacy of the user.

[0114] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0115] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0116] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0117] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0118] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0119] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0120] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0121] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A wind turbine yaw direction positioning system, characterized in that: Applied in the field of wind power generation technology, the wind turbine yaw direction positioning system comprises: The cylindrical shell is composed of a light-shielding film, and the wall has three vertical light-entry slits for obtaining sunlight, which are used as parallel light sources. The central angle between every two adjacent slits on the cylindrical shell is 120 degrees. When the sun shines on the measuring device, the light can only enter the measuring device from two or one of the three slits. The light beam entering the measuring device is projected as a light beam at the bottom of the measuring device, which will be captured by the photosensors at both ends of the projected light beam. 360 photosensitive elements, each of which is arranged around the bottom of the cylindrical shell, for capturing the projection of the sunlight, wherein the photosensitive elements are numbered starting from the photosensitive element at the other end of the reference line of the measuring device, and the other photosensitive elements are numbered sequentially in a counterclockwise direction; A positioning device, arranged at the bottom of the cylindrical housing, for obtaining geographic coordinate information and time information of the system installation point; A processor is arranged at the bottom of the cylindrical shell, and is connected to the photosensitive element and the positioning device through a transmission device. The processor uses the ratio of the number difference of the two photosensitive elements through which the light passes to the total number to obtain the deviation angle of the incident light beam relative to the reference direction, calculates the current sun direction angle based on the geographic coordinate information and the time information, and determines the size of the deviation angle and the sun direction angle: if the deviation angle is greater than the sun direction angle, the geographic orientation angle of the cabin is the difference between the deviation angle and the sun direction angle; if the deviation angle is less than the sun direction angle, the geographic orientation angle of the cabin is 360 minus the difference between the deviation angle and the sun direction angle, wherein the reference line of the measuring device is parallel to the central axis of the cabin; A storage device, connected to the processor, for storing and processing the geographic orientation angle of the cabin; A power supply device is connected to the processor, the storage device, the positioning device and the photosensitive element, and is used to provide power.

2. The wind turbine yaw direction positioning system according to claim 1, characterized in that: Calculating the current sun direction angle based on the geographic coordinate information and the time information includes: Get the solar declination angle based on the current time; Calculating the solar zenith angle using the solar declination angle, solar hour angle and local latitude; A solar azimuth angle is obtained based on the solar zenith angle.

3. The wind turbine yaw direction positioning system according to claim 2, characterized in that: The solar zenith angle calculation formula is: The solar azimuth angle calculation formula is: in, is the local latitude, is the solar declination angle, is the solar hour angle, is the solar altitude angle.

4. The wind turbine yaw direction positioning system according to claim 1, characterized in that: The light can only enter the measuring device through two or one of the three slits: When the incident light is projected into the bottom of the measuring device through the two light-entry slits and irradiates the four photosensitive elements of the two light-entry slits on the inner wall, the direction of the incident light is obtained using one of the two incident light rays; When the incident light is projected into the bottom of the measuring device through a light slit and illuminates two photosensitive elements of a light slit on the inner wall, the angle between the incident light and the measurement reference line is calculated by the photosensitive element number.

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