A method, system and device for calculating characteristic parameters of wind field under atmospheric inhomogeneity

Abstract

The present invention discloses a method for calculating characteristic parameters of a wind field under atmospheric inhomogeneity, comprising the following steps: obtaining wind measurement data from a measuring point, performing preprocessing to obtain radial wind speed information along the beam direction, and performing quality control on the raw data; establishing a five-parameter incoming wind field model; inputting the quality-controlled radial wind speed data into the five-parameter incoming wind field model to obtain characteristic parameters of the incoming wind field and calculate the horizontal wind speed and wind direction at the center; and performing quality control on the raw data, including determining the validity of the raw data based on the data availability at each moment, eliminating invalid data, and performing sliding window filling on the data at the eliminated moments. The present invention overcomes the problems of traditional wind turbine wind speed and direction meters, such as low wind parameter measurement accuracy, susceptibility to wind, sand, rain, and snow, and incomplete measurement parameters.

Description

Technical Field

[0001] The present invention relates to the field of new energy wind power generation, and in particular to a method for calculating characteristic parameters of a wind field under atmospheric inhomogeneity. Background Art

[0002] In recent years, my country's new energy development has achieved remarkable results, and the high-quality, high-quality and high-stable supply of wind power is particularly important.

[0003] Traditional wind turbine wind speed and direction meters have problems such as low wind parameter measurement accuracy, susceptibility to wind, sand, rain and snow, and incomplete measurement parameters. The inherent random volatility, intermittency, and vector variability of wind energy directly affect the wind farm's supply to the power grid. Accurate perception and reconstruction of the incoming wind field is not only conducive to accurate scheduling at the power grid end, but also provides reliable control parameters for the farm group control of wind turbines. It is of great significance for reducing the power grid load, achieving safe power grid operation and farm group control. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the present invention proposes a method for calculating the characteristic parameters of the wind field under atmospheric inhomogeneity, which is used to solve the problem of insufficient description of the characteristic parameters of the incoming wind field in the prior art, comprising the following steps:

[0005] Obtain wind measurement data from the measuring point, perform preprocessing, obtain radial wind speed information along the beam direction, and perform quality control on the raw data;

[0006] Establish a 5-parameter incoming wind field model;

[0007] The radial wind speed data after quality control are input into the five-parameter incoming wind field model to obtain the characteristic parameters of the incoming wind field and calculate the horizontal wind speed and direction at the center.

[0008] Preferably, the quality control of the original data includes judging the validity of the original data according to the data availability at each moment, eliminating invalid data, and performing sliding window filling on the data at the elimination moment.

[0009] Preferably, the establishment of the five-parameter incoming wind field model includes converting the incoming wind vector coordinate system into an inertial coordinate system and constructing a wind field model.

[0010] The present invention also provides a calculation system for characteristic parameters of wind field under atmospheric inhomogeneity, comprising:

[0011] The receiving module is used to obtain the wind measurement data of each measuring point and pre-process the wind measurement data to obtain the radial wind speed information along the beam direction;

[0012] Processing module: used to establish a 5-parameter incoming wind field model;

[0013] The calculation module is used to input radial wind speed data into the 5-parameter incoming wind field model, obtain the characteristic parameters of the incoming wind field and calculate the horizontal wind speed and wind direction at the center position.

[0014] Preferably, the calculation module includes converting the incoming wind vector coordinate system into an inertial coordinate system, constructing a wind field model, and calculating wind field characteristic parameters.

[0015] The present invention also provides a device for calculating characteristic parameters of wind field under atmospheric inhomogeneity, comprising:

[0016] Storage medium for storing computer programs;

[0017] The processor is used to implement the steps of the method for calculating the characteristic parameters of the wind field under atmospheric inhomogeneity when executing the computer program.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The present invention overcomes the problems of traditional wind turbine wind speed and direction meters, such as low wind parameter measurement accuracy, susceptibility to wind, sand, rain and snow, and incomplete measurement parameters.

[0020] (2) The effective wind speed at the center of different altitude layers is more timely and there is no problem of measurement time lag.

[0021] (3) The accuracy of effective wind speed is also greatly improved, which helps to reduce the peak load regulation pressure of the power grid and is of great significance for alleviating the coexistence of wind power curtailment and power shortage.

[0022] (4) The present application also provides a system and device for calculating characteristic parameters of wind fields under atmospheric inhomogeneity, which have the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of a method for calculating characteristic parameters of wind fields under atmospheric inhomogeneity according to the present invention;

[0024] Figure 2 This is a calculation flow chart of a method for calculating characteristic parameters of wind fields under atmospheric inhomogeneity according to the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of a device for calculating characteristic parameters of wind fields under atmospheric inhomogeneity according to the present invention;

[0026] Figure 4 This is a schematic diagram of the millimeter wave radar scanning wind measurement of the present invention;

[0027] Figure 5 This is the three-dimensional non-uniform flow model of the present invention. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] like Figure 1-2 As shown, the present invention provides a method for calculating characteristic parameters of wind field under atmospheric inhomogeneity. First, wind measurement data of each measuring point is obtained and preprocessed to obtain radial wind speed information along the beam direction, such as Figure 4 As shown, this method uses millimeter-wave radar to scan and measure the wind field. A lidar is installed at each measuring point in the wind measurement cabin to measure the wind speed blown from the rotor to each measuring point. This application calculates the wind field characteristic parameters of the measuring plane where the measuring point is located based on the wind speed measured at each measuring point, and then calculates the effective wind speed of the rotor based on the wind field characteristic parameters of each measuring plane.

[0030] After obtaining the wind measurement data at each measuring point, the wind measurement data needs to be quality controlled. The method is that when the millimeter-wave radar detects and outputs the radial wind speed, the data availability at each moment will be output synchronously. The validity of the data will be judged based on the data availability, invalid data will be eliminated, and the data at the elimination moment will be filled with sliding windows.

[0031] Establish a 5-parameter incoming wind field model and solve the parameters;

[0032] The radial wind speed data after quality control is input into the 5-parameter incoming wind field model to obtain the characteristic parameters of the incoming wind field and calculate the horizontal wind speed and wind direction at the center. The specific method is as follows:

[0033] like Figure 5 As shown, the three-dimensional non-uniform flow model is a non-uniform wind field flow model, assuming that the horizontal and vertical wind components in the incoming wind vector coordinate system are and Is 0. Vertical wind component The average vertical wind speed , linear transverse shear coefficient , linear longitudinal shear coefficient , transverse inflow angle and longitudinal inflow angle Settings (see Figure 2 ). These parameters are referred to as wind characteristics in the method. The wind speed vector field and wind characteristics are assumed to remain constant over a given time period:

[0034] The relationship for transforming the incoming wind vector coordinate system to the inertial coordinate system is established as follows:

[0035] (1)

[0036] (2)

[0037] (3)

[0038] The method for constructing the wind field model includes:

[0039] (4)

[0040] (5)

[0041] The transformation relationship between the wind vector coordinate system and the inertial coordinate system is:

[0042] (6)

[0043] The projection of the wind vector along the radar beam direction in the inertial coordinate system is:

[0044] (7)

[0045] (5)(6)(7) together we get:

[0046] (8)

[0047] (9)

[0048] in, are the coordinates of the millimeter-wave radar detection points;

[0049] Combining (8) and (9) gives the following five-variable nonlinear equations, and solves the wind field characteristic parameters simultaneously: .

[0050] When the millimeter-wave radar operates normally, the wind speed reconstruction algorithm can measure the wind field information in a specific area and meet the needs of wind farm group control, providing reliable control input parameters for auxiliary feedforward control of wind turbines.

[0051] The present invention also provides a system for calculating characteristic wind field parameters under atmospheric inhomogeneity, comprising: a receiving module for acquiring wind measurement data from each measuring point and preprocessing the wind measurement data to obtain radial wind speed information along the beam direction; a processing module for establishing a five-parameter incoming wind field model; and a calculation module for inputting the radial wind speed data into the five-parameter incoming wind field model to obtain characteristic wind field parameters and calculate the horizontal wind speed and direction at the center. The calculation module includes converting the incoming wind vector coordinate system to an inertial coordinate system, constructing a wind field model, and calculating the wind field characteristic parameters.

[0052] like Figure 3 As shown, the present invention also provides a device for calculating the characteristic parameters of the wind field under atmospheric inhomogeneity, a storage medium for storing a computer program; a processor for implementing the steps of a method for calculating the characteristic parameters of the wind field under atmospheric inhomogeneity when executing the computer program, and also includes hardware such as input and output interfaces, wired or wireless network interfaces, etc.

[0053] The solution of this invention overcomes the problems of traditional wind turbine anemometers, such as low wind parameter measurement accuracy, susceptibility to wind, sand, rain, and snow, and incomplete measurement parameters. The effective wind speed at the center of different altitudes is now more timely, eliminating measurement time lags. Furthermore, the accuracy of the effective wind speed is greatly improved, helping to reduce peak load on the power grid and playing a significant role in alleviating the coexistence of wind curtailment and power shortages.

[0054] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and they are not intended to limit the scope of protection of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A method for calculating characteristic parameters of wind field under atmospheric inhomogeneity, characterized in that: The steps include: Obtain wind measurement data from the measuring point, perform preprocessing, obtain radial wind speed information along the beam direction, and perform quality control on the raw data; Establish a 5-parameter incoming wind field model; The radial wind speed data after quality control is input into the 5-parameter incoming wind field model to obtain the characteristic parameters of the incoming wind field and calculate the horizontal wind speed and wind direction at the center; The establishment of the five-parameter incoming wind field model includes converting the incoming wind vector coordinate system into an inertial coordinate system and constructing a wind field model; The conversion method of the incoming wind vector coordinate system to the inertial coordinate system is: （1） （2） （3） Where: lateral and longitudinal wind components in the incoming wind vector coordinate system and 0; vertical wind component The average vertical wind speed , linear transverse shear coefficient , linear longitudinal shear coefficient , transverse inflow angle and longitudinal inflow angle set up; The method for constructing the wind field model includes: （4） （5） The transformation relationship between the wind vector coordinate system and the inertial coordinate system is: （6） The projection of the wind vector along the radar beam direction in the inertial coordinate system is: （7） (5)(6)(7) together we get: （8） （9） in, are the coordinates of the millimeter-wave radar detection points; Combine (8) and (9) to solve the wind field characteristic parameters .

2. The method for calculating characteristic parameters of wind field under atmospheric inhomogeneity according to claim 1, characterized in that: The quality control of the original data includes judging the validity of the original data according to the data availability at each moment, eliminating invalid data, and performing sliding window filling on the data at the elimination moment.

3. A system for calculating characteristic parameters of wind fields under atmospheric inhomogeneity, characterized by: A method for calculating characteristic parameters of a wind field under an atmospheric inhomogeneity according to any one of claims 1 to 2, comprising: The receiving module is used to obtain the wind measurement data of each measuring point and pre-process the wind measurement data to obtain the radial wind speed information along the beam direction; Processing module: used to establish a 5-parameter incoming wind field model; The calculation module is used to input radial wind speed data into the 5-parameter incoming wind field model, obtain the characteristic parameters of the incoming wind field and calculate the horizontal wind speed and wind direction at the center position.

4. The system for calculating characteristic parameters of wind field under atmospheric inhomogeneity according to claim 3, characterized in that: The calculation module includes converting the incoming wind vector coordinate system into an inertial coordinate system, constructing a wind field model, and calculating wind field characteristic parameters.

5. A device for calculating characteristic parameters of wind fields under atmospheric inhomogeneity, characterized by: include Storage medium for storing computer programs; A processor is used to implement the steps of the method for calculating characteristic parameters of the wind field under atmospheric inhomogeneity as described in any one of claims 1 to 2 when executing the computer program.

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