Wind turbine shadow evaluation method and system considering wind direction time sequence

Abstract

The invention belongs to the technical field of wind power generation. According to the wind turbine shadow assessment method and system considering the wind direction time sequence, a shadow model of a wind turbine wind wheel at each assessment moment is simplified into a round face facing the incoming flow wind direction, more accurate assessment of the shadow of the wind turbine is achieved, optimal arrangement of photovoltaic modules near the wind turbine can be achieved, and the wind turbine shadow assessment efficiency is improved. And the photovoltaic generating capacity is improved on the basis of the same layout area of the photovoltaic modules.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a wind turbine light and shadow evaluation method considering wind direction time series, a wind turbine light and shadow evaluation system considering wind direction time series, a computer device, a computer-readable storage medium and a computer program product. Background Art

[0002] The statements in this section merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] A wind-solar hybrid power plant, also known as a wind-solar complementary power generation system, is a combined power generation system that combines solar photovoltaic power generation and wind power generation. This system uses the natural complementarity of wind and solar energy to improve the energy utilization and stability of the entire system. The wind-solar complementary power generation system integrates wind and photovoltaic power generation systems, which can save installation power and reduce the space occupied by equipment. By utilizing the complementary advantages of wind and photovoltaic energy, the stability of the system can be effectively improved and power outages caused by insufficient single energy can be reduced. On sunny and windless days, solar power generation is more effective; on rainy and windy days, wind power generation is more effective.

[0004] When laying out a wind-solar hybrid power generation system, one of the most critical issues is how to select the location of photovoltaic modules to reduce the impact of the ground shadow of the wind turbine rotor on the photovoltaic modules. When calculating the traditional impact area of ​​the generator rotor shadow, the sweep range of the generator rotor is simplified to a sphere, and the sphere is used as a simplified model of the wind turbine in the geographic coordinates to evaluate the impact of light and shadow. This model is too simplified and does not take into account the rotation of the generator rotor under the wind direction time series, making the light and shadow model lack of accuracy and unable to be effectively used for the optimization of the layout of photovoltaic panels near wind turbines. Summary of the invention

[0005] In order to address the deficiencies of the prior art, the present invention provides a wind turbine light and shadow evaluation method and system taking into account the wind direction time series, which simplifies the light and shadow model of the wind turbine rotor at each evaluation moment into a circular surface facing the incoming wind direction, thereby achieving a more accurate evaluation of the wind turbine light and shadow, and further enabling the optimal layout of photovoltaic modules near the wind turbine, thereby increasing photovoltaic power generation on the basis of the same photovoltaic module layout area.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: In a first aspect, the present invention provides a method for evaluating light and shadow of a wind turbine taking into account a time series of wind directions.

[0007] A wind turbine light and shadow evaluation method considering wind direction time series includes the following processes: Discretize the ground near the wind turbine into a plurality of grids, divide the period to be evaluated into minute-level time periods, and obtain a first horizontal distance between the highest point of the wind turbine rotor and the ground projection point and a second horizontal distance between the lowest point of the wind turbine rotor and the ground projection point according to the azimuth of the sun in each minute-level time period, wherein the first distance and the second distance are both the horizontal distances between the ground projection point and the wind turbine; For any grid to be evaluated, determine whether it coincides with the projection direction at this time according to the direction of the center of the grid to be evaluated relative to the wind turbine rotor. If it coincides, determine whether the horizontal distance from the center of the grid to be evaluated to the wind turbine is between the second horizontal distance and the first horizontal distance. If so, determine that the grid to be evaluated is affected, add a minute-level period to the affected time, and continue to determine until the grid to be evaluated is not affected, thereby obtaining the affected time period and / or cumulative affected time of each grid in the entire period to be evaluated.

[0008] As a further limitation of the first aspect of the present invention, when the azimuth direction of the sun relative to the wind turbine coincides with the incoming wind direction, the backlit shadow area of ​​the circular surface swept by the wind turbine rotor is a cylinder with an axis L1 and a diameter D, wherein L1 is a straight line from the center of the wind turbine rotor to the ground parallel to the sun's rays, D is the diameter of the wind turbine rotor, and the ground at the interface of the cylinder is the shadow area of ​​the wind turbine rotor; When the sun's azimuth direction relative to the wind turbine does not coincide with the incoming wind direction, the wind turbine rotor tracks the wind direction and rotates. The backlit shadow area of ​​the circular surface swept by the wind turbine rotor is an elliptical cylinder, and the interface of the ground on the elliptical cylinder is the shadow area projected by the wind rotor.

[0009] As a further limitation of the first aspect of the present invention, the major axis of the elliptical cylinder is the diameter of the wind turbine rotor, and the minor axis of the elliptical cylinder is determined in real time according to the rotation angle of the wind turbine rotor relative to the sun.

[0010] As a further limitation of the first aspect of the present invention, the direction of the wind turbine is obtained based on historical wind data of the same period and a prediction model, or the direction of the wind turbine rotor is obtained based on a real-time sensor.

[0011] As a further limitation of the first aspect of the present invention, when considering the impact of a wind farm on sensitive areas such as residential areas, the shadow impact time period of the surrounding tall buildings and mountains on the grid representing the residential area is calculated. If it overlaps with the period of time when the residential area is shadowed by the wind farm, the overlapping time is subtracted from the wind farm impact time, and is not included in the light and shadow impact of the wind farm; When considering the shadow impact on sensitive areas in a wind farm, if the shadow time cast by the surrounding tall buildings and mountains on residential areas overlaps, the overlapping time will be added to the wind farm impact time as the total shadow impact time.

[0012] In a second aspect, the present invention provides a wind turbine light and shadow assessment system that takes into account wind direction time series.

[0013] A wind turbine light and shadow evaluation system considering wind direction time series, comprising: The gridding unit is configured to: discretize the ground near the wind turbine into a plurality of grids, divide the period to be evaluated into minute-level time periods, and obtain, in each minute-level time period, a first horizontal distance between the highest point of the wind turbine rotor and the ground projection point, and a second horizontal distance between the lowest point of the wind turbine rotor and the ground projection point according to the azimuth of the sun, wherein the first distance and the second distance are both horizontal distances between the ground projection point and the wind turbine; The shadow assessment unit is configured to: for any grid to be assessed, determine whether it coincides with the projection direction at this time according to the direction of the center of the grid to be assessed relative to the wind turbine; if it coincides, determine whether the horizontal distance from the center of the grid to be assessed to the wind turbine is between the second horizontal distance and the first horizontal distance; if so, determine that the grid to be assessed is affected, add a minute-level period to the affected time, continue to determine until the grid to be assessed is not affected, and obtain the affected time period and / or cumulative affected time of each grid in the entire period to be assessed.

[0014] As a further limitation of the second aspect of the present invention, in the shadow assessment unit, when the azimuth direction of the sun relative to the wind turbine coincides with the incoming wind direction, the backlit shadow area of ​​the circular surface swept by the wind turbine rotor is a cylinder with an axis L1 and a diameter D, wherein L1 is a straight line from the center of the wind turbine rotor to the ground parallel to the sun's rays, D is the diameter of the wind turbine rotor, and the ground at the interface of the cylinder is the shadow area of ​​the wind turbine rotor; When the sun's azimuth direction relative to the wind turbine does not coincide with the incoming wind direction, the wind turbine rotor tracks the wind direction and rotates. The backlit shadow area of ​​the circular surface swept by the wind turbine rotor is an elliptical cylinder, and the interface of the ground on the elliptical cylinder is the shadow area projected by the wind rotor.

[0015] As a further limitation of the second aspect of the present invention, in the shadow assessment unit, when considering the impact of the wind farm on sensitive areas such as residential areas, the shadow impact time period of the surrounding tall buildings and mountains on the grid representing the residential area is calculated. If it overlaps with the period of time when the residential area is shadowed by the wind farm, the overlapping time is subtracted from the wind farm impact time, and is not included in the light and shadow impact of the wind farm; When considering the shadow impact on sensitive areas in a wind farm, if the shadow time cast by the surrounding tall buildings and mountains on residential areas overlaps, the overlapping time will be added to the wind farm impact time as the total shadow impact time.

[0016] In a third aspect, the present invention provides a computer device, comprising: a processor and a computer-readable storage medium; a processor adapted to execute a computer program; A computer-readable storage medium having a computer program stored therein, wherein when the computer program is executed by the processor, the wind turbine light and shadow evaluation method considering the wind direction time series as described in the first aspect of the present invention is implemented.

[0017] In a fourth aspect, the present invention provides a computer-readable storage medium storing a computer program, wherein the computer program is suitable for being loaded by a processor and executing the wind turbine light and shadow evaluation method considering wind direction time series as described in the first aspect of the present invention.

[0018] In a fifth aspect, the present invention provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the wind turbine light and shadow evaluation method considering the wind direction time series as described in the first aspect of the present invention. Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention innovatively proposes a wind turbine light and shadow assessment strategy that takes into account the wind direction time series, and simplifies the light and shadow model of the wind turbine rotor at each evaluation moment into a circular surface facing the incoming wind direction, thereby achieving a more accurate assessment of the wind turbine light and shadow, and then being able to achieve the optimal layout of photovoltaic modules near the wind turbine, thereby increasing photovoltaic power generation based on the same photovoltaic module layout area.

[0019] 2. The present invention innovatively proposes a wind turbine light and shadow assessment strategy that takes into account the wind direction time series, based on the relationship between wind direction and wind turbine orientation, when the azimuth direction of the sun relative to the wind turbine coincides with the incoming wind direction, the backlit shadow area of ​​the circular surface swept by the wind turbine rotor is a cylinder, and the interface of the ground on the cylinder is the shadow area of ​​the wind turbine rotor; when the azimuth direction of the sun relative to the wind turbine does not coincide with the incoming wind direction, the wind turbine rotor tracks the wind direction and rotates, and the backlit shadow area of ​​the circular surface swept by the wind turbine rotor is an elliptical cylinder, and the interface of the ground on the elliptical cylinder is the shadow area projected by the wind rotor. This modeling method can more accurately assess the shadow of the wind turbine rotor.

[0020] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0022] Figure 1 A schematic flow chart of a wind turbine light and shadow evaluation method considering wind direction time series provided in Embodiment 1 of the present invention; Figure 2 A schematic diagram of a light and shadow effect model provided in Example 1 of the present invention; Figure 3 A schematic diagram of distance calculation provided in Example 1 of the present invention; Figure 4 A schematic diagram of a wind turbine light and shadow evaluation system considering wind direction time series provided in Embodiment 2 of the present invention; Figure 5 A schematic diagram of a computer device provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0025] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0026] Embodiment 1: As mentioned in the background technology, light and shadow are generated during the operation of wind turbines, which have an impact on photovoltaic power generation facilities in wind-solar hybrid power plants. Existing light and shadow assessment schemes do not take into account the relationship between wind direction and wind turbine rotor orientation, making the wind turbine model in light and shadow assessment too simplified and unable to accurately simulate the available photovoltaic power generation candidate areas around the wind turbine. In view of this, this implementation proposes a wind turbine light and shadow assessment method that considers the wind direction time series, such as Figure 1 As shown, the following process is included: S1: Discretize the ground near the wind turbine into many grids, divide the period to be evaluated into minute-level periods, and in each minute-level period, obtain the first horizontal distance of the highest point of the wind turbine rotor to the ground projection point according to the azimuth of the sun. L1 , and the second horizontal distance of the lowest point of the wind turbine rotor on the ground projection point L2 , the first distance and the second distance are both horizontal distances from the ground projection point to the wind turbine; S2: For any grid to be evaluated, determine whether the direction of the center of the grid to be evaluated relative to the wind turbine rotor coincides with the projection direction at this time. If coincident, determine whether the horizontal distance from the center of the grid to be evaluated to the wind turbine is between the second horizontal distance and the first horizontal distance. If so, determine that the grid to be evaluated is affected, add a minute-level period to the affected time, and continue to determine until the grid to be evaluated is not affected, thereby obtaining the affected time period and / or cumulative affected time of each grid in the entire period to be evaluated.

[0027] In this implementation, the wind direction in the local wind measurement data is analyzed, and the time of the year and wind direction are combined to generate a wind direction time series. When evaluating the light and shadow of the wind turbine at each moment, the wind direction data at that moment is combined to obtain the direction of the wind turbine rotor at that moment, and then the sun's altitude angle is combined for calculation, and the light and shadow model at each moment is simplified to a circular surface facing the incoming wind direction, with a diameter equal to the wind turbine rotor diameter D, and the center at the hub.

[0028] L represents the straight line passing through the center of the hub and parallel to the sunlight. When the azimuth direction of the sun relative to the wind turbine coincides with the incoming wind direction, the backlit shadow area of ​​the circular surface swept by the wind rotor is a cylinder with L as the axis and D as the diameter, and the interface of the ground on the cylindrical surface is the shadow area projected by the wind rotor. When the azimuth direction of the sun relative to the wind turbine does not coincide with the incoming wind direction, the wind rotor of the wind turbine rotates to track the wind direction, and the projection area is smaller than that of a sphere. The backlit shadow area of ​​the circular surface swept by the wind rotor is an elliptical cylinder, and the interface of the ground on the elliptical cylinder is the shadow area projected by the wind rotor.

[0029] The ground near the wind turbine is discretized into many small grids and a year is divided into 10 minutes (i.e. minute-level time periods). In each minute-level time period, whether the small grid is affected by the shadow is determined based on whether the direction of the center of the small grid on the ground relative to the wind turbine coincides with the direction of the shadow at this time, and the horizontal distance from the center of the small grid on the ground to the wind turbine. If affected, the affected time of the small grid will be increased by 10 minutes (i.e. one minute-level time period is added).

[0030] Specifically, Figure 2 and Figure 3 As shown, the calculation method is as follows: Calculating the solar altitude angle is the basis for studying the light and shadow flicker of wind turbines. The calculation formula for the solar altitude angle is as follows: (1); Where: is the local latitude, deg ; The sun's red tail angle, deg ; is the solar hour angle, deg.

[0031] Where: Solar declination angle for: (2); Where: n To calculate the sequence of days of the year for the current day.

[0032] The specific calculation time and Beijing time can be converted according to the following formula: (3); Where: L is the measured local latitude; E To correct the time difference, the calculation formula is as follows: (4); In the formula, .

[0033] After calculating the solar altitude angle, the length of the wind turbine rotor projection during this period can be calculated. First, calculate the projection distance of the top of the wind turbine rotor. L1 ,Right now Figure 3 OB distance in: (5); Wherein, D1 is the sum of the top of the wind turbine rotor and the elevation difference between the sensitive point and the wind turbine coordinates, in meters.

[0034] Then calculate the projection distance of the lower end of the wind turbine rotor L2 ,Right now Figure 3 OA segment distance in: (6); in, D2 It is the sum of the lowest point of the wind turbine rotor and the elevation difference between the sensitive point and the wind turbine coordinates, in meters.

[0035] The ground near the wind turbine is discretized into many small grids and a year is divided into 10 minutes. In each 10-minute period, whether it is affected is determined based on whether the direction of the center of the small grid relative to the wind turbine coincides with the shadow direction at this time and whether the distance from the center of the grid to the wind turbine is less than the shadow length calculated according to the formula. If affected, the affected time of the small grid is added with 10 minutes. According to this method, the number of hours the ground around the wind rotor is affected can be calculated.

[0036] In this implementation method, the light and shadow effects of the wind turbine rotor can be combined with the light and shadow effects of the tower body model. The tower body model does not rotate and can be implemented using existing methods. It only requires superimposing the light and shadow effects of the wind turbine rotor described in this implementation method, which will not be repeated here.

[0037] For tall buildings and even mountains in and around wind farms, a treatment method similar to that of towers is used to simplify the buildings or mountains into squares to consider the light and shadow effects. When considering the impact of wind farms on sensitive areas such as residential areas, calculate the time period of shadow impacts caused by the surrounding tall buildings and mountains on the grids representing residential areas. If there is an overlap with the period of time when the residential area is affected by the shadow of the wind farm, the overlap time should be subtracted from the wind farm impact time and not included in the light and shadow impacts caused by the wind farm. For example: It is calculated that from 9:00 to 11:00, the residential area is under the shadow of the wind turbine, and from 9:00 to 10:00, the residential area is also affected by the shadow of the nearby mountains, so the shadow of the wind turbine affects the residential area from 10:00 to 11:00.

[0038] When the method described in this implementation method considers the shadow impact on sensitive areas such as photovoltaic components in a wind farm, if the shadow time of the surrounding tall buildings and mountains on the residential area overlaps, it should be included in the time range of the impact on the photovoltaic components. For example: from 9:00 to 10:00, the sensitive area of ​​the photovoltaic component is under the shadow of the wind turbine, and from 9:30 to 11:00, the sensitive area of ​​the photovoltaic component is also affected by the shadow of the nearby mountains, so the period of time when the sensitive area of ​​the photovoltaic component is affected by the shadow is 9:00-11:00.

[0039] When calculating the area affected by the wind rotor shadow, the implementation method uses the wind turbine to track the wind direction to form a brake disc. The projected area of ​​the brake disc is smaller than that of a sphere, and the sweeping range of the wind rotor is simplified to a circular surface to more accurately simulate the actual situation. This is used as a simplified model of the wind turbine in the geographic coordinates to evaluate the impact of light and shadow, and the wind direction time series is considered to make the light and shadow model more accurate, which is beneficial to the optimization of the layout of photovoltaic panels near wind turbines, such as arranging them in the grid with the least light and shadow area in a year.

[0040] Embodiment 2: like Figure 4 As shown, this implementation provides a wind turbine light and shadow evaluation system considering wind direction time series, including: The gridding unit is configured to: discretize the ground near the wind turbine into a plurality of grids, divide the period to be evaluated into minute-level time periods, and obtain, in each minute-level time period, a first horizontal distance between the highest point of the wind turbine rotor and the ground projection point, and a second horizontal distance between the lowest point of the wind turbine rotor and the ground projection point according to the azimuth of the sun, wherein the first distance and the second distance are both horizontal distances between the ground projection point and the wind turbine; The shadow evaluation unit is configured to: for any grid to be evaluated, determine whether it coincides with the projection direction at this time according to the direction of the center of the grid to be evaluated relative to the wind turbine, and when it coincides, determine whether the horizontal distance from the center of the grid to be evaluated to the wind turbine is between the second horizontal distance and the first horizontal distance, and if so, determine that the grid to be evaluated is affected, add a minute-level period to the affected time, and continue to determine until the grid to be evaluated is not affected, so as to obtain the affected time period and / or cumulative affected time of each grid in the entire period to be evaluated The specific working methods of the gridding unit and the shadow assessment unit are described in the introduction of Example 1 and will not be repeated here.

[0041] It is understandable that the above-mentioned units can be separately or completely combined into one or several other units to constitute, or some of the units can be further divided into multiple functionally smaller units to constitute, which can achieve the same operation without affecting the realization of the technical effects of the embodiments of the present application. The above-mentioned units are divided based on logical functions. In practical applications, the function of one unit can also be implemented by multiple units, or the functions of multiple units can be implemented by one unit. In other embodiments of the present application, the wind turbine light and shadow evaluation system considering the wind direction time series can also include other units. In practical applications, these functions can also be implemented with the assistance of other units, and can be implemented by the collaboration of multiple units.

[0042] According to another embodiment of the present application, the system described in this embodiment can be constructed, and the wind turbine light and shadow evaluation method considering wind direction time series of the embodiment of the present application can be implemented by running a computer program (including program code) capable of executing the steps involved in the corresponding method described in Example 1 on a general computing device such as a computer including processing elements and storage elements such as a central processing unit (CPU), random access memory (RAM), and read-only memory (ROM). The computer program can be recorded on, for example, a computer-readable recording medium, and loaded into the above-mentioned computing device through the computer-readable recording medium and run therein.

[0043] Embodiment 3: like Figure 5 As shown, this implementation provides an electronic device, which includes a processor 1001, a communication interface 1002, and a computer-readable storage medium 1003. The processor 1001, the communication interface 1002, and the computer-readable storage medium 1003 may be connected via a bus or other means.

[0044] Among them, the communication interface 1002 is used to receive and send data, the computer-readable storage medium 1003 can be stored in the memory of the electronic device, the computer-readable storage medium 1003 is used to store a computer program, the computer program includes program instructions, and the processor 1001 is used to execute the program instructions stored in the computer-readable storage medium 1003.

[0045] The processor 1001 (or CPU (Central Processing Unit)) is the computing core and control core of the electronic device, which is suitable for implementing one or more instructions, and specifically suitable for loading and executing one or more instructions to implement corresponding method processes or corresponding functions.

[0046] The processor 1001 is configured to execute the following process: Discretize the ground near the wind turbine into a plurality of grids, divide the period to be evaluated into minute-level time periods, and obtain a first horizontal distance between the highest point of the wind turbine rotor and the ground projection point and a second horizontal distance between the lowest point of the wind turbine rotor and the ground projection point according to the azimuth of the sun in each minute-level time period, wherein the first distance and the second distance are both the horizontal distances between the ground projection point and the wind turbine; For any grid to be evaluated, according to the direction of the center of the grid to be evaluated relative to the wind turbine, determine whether it coincides with the projection direction at this time. If it coincides, determine whether the horizontal distance from the center of the grid to be evaluated to the wind turbine is between the second horizontal distance and the first horizontal distance. If so, determine that the grid to be evaluated is affected, add a minute-level period to the affected time, and continue to determine until the grid to be evaluated is not affected, and obtain the affected time period and / or cumulative affected time of each grid in the entire period to be evaluated. The specific working method is described in Example 1 and will not be repeated here.

[0047] Embodiment 4: This implementation provides a computer-readable storage medium (Memory), which is a memory device in an electronic device for storing programs and data. It is understandable that the computer-readable storage medium here can include both built-in storage media in the electronic device and, of course, extended storage media supported by the electronic device. The computer-readable storage medium provides a storage space that stores the processing system of the electronic device.

[0048] In addition, the storage space also stores one or more instructions suitable for being loaded and executed by the processor, and these instructions may be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here may be a high-speed RAM memory, or a non-volatile memory, such as at least one disk memory; optionally, it may also be at least one computer-readable storage medium located away from the aforementioned processor.

[0049] In one embodiment, the computer-readable storage medium stores one or more instructions; the processor loads and executes the one or more instructions stored in the computer-readable storage medium to implement the following process: Discretize the ground near the wind turbine into a plurality of grids, divide the period to be evaluated into minute-level time periods, and obtain a first horizontal distance between the highest point of the wind turbine rotor and the ground projection point and a second horizontal distance between the lowest point of the wind turbine rotor and the ground projection point according to the azimuth of the sun in each minute-level time period, wherein the first distance and the second distance are both the horizontal distances between the ground projection point and the wind turbine; For any grid to be evaluated, according to the direction of the center of the grid to be evaluated relative to the wind turbine, determine whether it coincides with the projection direction at this time. If it coincides, determine whether the horizontal distance from the center of the grid to be evaluated to the wind turbine is between the second horizontal distance and the first horizontal distance. If so, determine that the grid to be evaluated is affected, add a minute-level period to the affected time, and continue to determine until the grid to be evaluated is not affected, and obtain the affected time period and / or cumulative affected time of each grid in the entire period to be evaluated. The specific working method is described in Example 1 and will not be repeated here.

[0050] Embodiment 5: The present implementation provides a computer program product or a computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the electronic device performs the following process: Discretize the ground near the wind turbine into a plurality of grids, divide the period to be evaluated into minute-level time periods, and obtain a first horizontal distance between the highest point of the wind turbine rotor and the ground projection point and a second horizontal distance between the lowest point of the wind turbine rotor and the ground projection point according to the azimuth of the sun in each minute-level time period, wherein the first distance and the second distance are both the horizontal distances between the ground projection point and the wind turbine; For any grid to be evaluated, according to the direction of the center of the grid to be evaluated relative to the wind turbine, determine whether it coincides with the projection direction at this time. If it coincides, determine whether the horizontal distance from the center of the grid to be evaluated to the wind turbine is between the second horizontal distance and the first horizontal distance. If so, determine that the grid to be evaluated is affected, add a minute-level period to the affected time, and continue to determine until the grid to be evaluated is not affected, and obtain the affected time period and / or cumulative affected time of each grid in the entire period to be evaluated. The specific working method is described in Example 1 and will not be repeated here.

[0051] A person skilled in the art can appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in this application can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0052] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted through a computer-readable storage medium. The computer instructions can be transmitted from a website site, a computer, a server or a data center to another website site, a computer, a server or a data center by wired (e.g., coaxial cable, optical fiber, digital line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by the computer or a data processing device such as a server, a data center, etc. that includes one or more available media integrated. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)), etc.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wind turbine light and shadow evaluation method considering wind direction time series, characterized in that: The process includes: Discretize the ground near the wind turbine into a plurality of grids, divide the period to be evaluated into minute-level time periods, and obtain a first horizontal distance between the highest point of the wind turbine rotor and the ground projection point and a second horizontal distance between the lowest point of the wind turbine rotor and the ground projection point according to the azimuth of the sun in each minute-level time period, wherein the first distance and the second distance are both the horizontal distances between the ground projection point and the wind turbine; For any grid to be evaluated, determine whether it coincides with the projection direction at this time according to the direction of the center of the grid to be evaluated relative to the wind turbine rotor. If it coincides, determine whether the horizontal distance from the center of the grid to be evaluated to the wind turbine is between the second horizontal distance and the first horizontal distance. If so, determine that the grid to be evaluated is affected, add a minute-level period to the affected time, and continue to determine until the grid to be evaluated is not affected, thereby obtaining the affected time period and / or cumulative affected time of each grid in the entire period to be evaluated.

2. The wind turbine light and shadow evaluation method considering wind direction time series according to claim 1, characterized in that: When the azimuth direction of the sun relative to the wind turbine coincides with the incoming wind direction, the backlit shadow area of ​​the circular surface swept by the wind turbine rotor is a cylinder with axis L1 and diameter D, where L1 is a straight line from the center of the wind turbine rotor to the ground parallel to the sun's rays, D is the diameter of the wind turbine rotor, and the ground at the interface of the cylinder is the shadow area of ​​the wind turbine rotor; When the sun's azimuth direction relative to the wind turbine does not coincide with the incoming wind direction, the wind turbine rotor tracks the wind direction and rotates. The backlit shadow area of ​​the circular surface swept by the wind turbine rotor is an elliptical cylinder, and the interface of the ground on the elliptical cylinder is the shadow area projected by the wind rotor.

3. The wind turbine light and shadow evaluation method considering wind direction time series according to claim 2, characterized in that: The major axis of the elliptical cylinder is the diameter of the wind turbine rotor, and the minor axis of the elliptical cylinder is determined in real time according to the angle of rotation of the wind turbine rotor relative to the sun; or, the direction of the wind turbine is predicted according to historical wind data for the same period and a prediction model, or, the direction of the wind turbine rotor is obtained according to a real-time sensor.

4. The wind turbine light and shadow evaluation method considering wind direction time series according to any one of claims 1 to 3, characterized in that: When considering the impact of wind farms on sensitive areas such as residential areas, calculate the time period of shadows cast by surrounding tall buildings and mountains on the grid representing the residential area. If the shadow period overlaps with the residential area, the overlap time is subtracted from the wind farm impact time and is not included in the light and shadow impact of the wind farm. When considering the shadow impact on sensitive areas in a wind farm, if the shadow time cast by the surrounding tall buildings and mountains on residential areas overlaps, the overlapping time will be added to the wind farm impact time as the total shadow impact time.

5. A wind turbine light and shadow evaluation system considering wind direction time series, characterized in that: include: The gridding unit is configured to: discretize the ground near the wind turbine into a plurality of grids, divide the period to be evaluated into minute-level time periods, and obtain, in each minute-level time period, a first horizontal distance between the highest point of the wind turbine rotor and the ground projection point, and a second horizontal distance between the lowest point of the wind turbine rotor and the ground projection point according to the azimuth of the sun, wherein the first distance and the second distance are both horizontal distances between the ground projection point and the wind turbine; The shadow assessment unit is configured to: for any grid to be assessed, determine whether it coincides with the projection direction at this time according to the direction of the center of the grid to be assessed relative to the wind turbine; if it coincides, determine whether the horizontal distance from the center of the grid to be assessed to the wind turbine is between the second horizontal distance and the first horizontal distance; if so, determine that the grid to be assessed is affected, add a minute-level period to the affected time, continue to determine until the grid to be assessed is not affected, and obtain the affected time period and / or cumulative affected time of each grid in the entire period to be assessed.

6. The wind turbine light and shadow evaluation system considering wind direction time series according to claim 5, characterized in that: In the shadow assessment unit, when the sun's azimuth direction relative to the wind turbine coincides with the incoming wind direction, the backlit shadow area of ​​the circular surface swept by the wind turbine rotor is a cylinder with an axis L1 and a diameter D, wherein L1 is a straight line from the center of the wind turbine rotor to the ground parallel to the sun's rays, D is the diameter of the wind turbine rotor, and the ground at the interface of the cylinder is the shadow area of ​​the wind turbine rotor; When the sun's azimuth direction relative to the wind turbine does not coincide with the incoming wind direction, the wind turbine rotor tracks the wind direction and rotates. The backlit shadow area of ​​the circular surface swept by the wind turbine rotor is an elliptical cylinder, and the interface of the ground on the elliptical cylinder is the shadow area projected by the wind rotor.

7. The wind turbine light and shadow evaluation system considering wind direction time series according to claim 5 or 6, characterized in that: In the shadow assessment unit, when considering the impact of wind farms on sensitive areas such as residential areas, calculate the time period of shadow impact caused by surrounding tall buildings and mountains on the grid representing the residential area. If it overlaps with the period of shadow of the residential area caused by the wind farm, the overlapping time is subtracted from the wind farm impact time and is not included in the light and shadow impact of the wind farm; When considering the shadow impact on sensitive areas in a wind farm, if the shadow time cast by the surrounding tall buildings and mountains on residential areas overlaps, the overlapping time will be added to the wind farm impact time as the total shadow impact time.

8. A computer device, characterized in that: include: A processor and a computer readable storage medium; a processor adapted to execute a computer program; A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed by the processor, the wind turbine light and shadow evaluation method considering the wind direction time series as described in any one of claims 1 to 4 is implemented.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is suitable for being loaded by a processor and executing the wind turbine light and shadow assessment method considering wind direction time series according to any one of claims 1 to 4.

10. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the method for evaluating light and shadow of a wind turbine taking into account a wind direction time series as claimed in any one of claims 1 to 4 is implemented.

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