A wind turbine control method, system, medium and computer device based on power curve under low-level jet

Abstract

The application discloses a wind turbine generator power generation technical field based on low-altitude jet power curve wind turbine control method, system, medium and computer device. The method comprises the following steps: acquiring measured wind field data; inputting the measured wind field data into a wind turbine power curve model to obtain a current power curve; dividing a wind turbine control interval according to the current power curve to regulate and control a wind turbine operating state; wherein the construction of the wind turbine power curve model comprises the following steps: acquiring a wind turbine model and historical wind field data of a wind farm; performing numerical simulation on the wind turbine according to the wind turbine model and the historical wind field data of the wind farm to obtain a wind turbine power curve model considering low-altitude jet sensitive characteristics. The application can accurately divide the wind turbine control interval and actively regulate and control the wind turbine operating state by measuring the wind speed at different heights, establishing a real-time power curve model and improving the power generation under the action of low-altitude jet.

Description

Technical Field

[0001] This invention relates to a wind turbine control method, system, medium, and computer device based on the power curve under low-altitude jet stream, belonging to the field of wind turbine power generation technology. Background Technology

[0002] The power curve, as a crucial basis for evaluating the power generation performance of wind turbines, reflects the relationship between hub wind speed and power generation. In actual operation, wind turbines face complex atmospheric boundary layer flows, which can lead to deviations between the actual power curve and the design power curve. This, in turn, affects the reliability of wind farm power generation assessments and the overall regulation of the wind farm. The wind speed profile distribution of the low-level jet stream differs significantly from that of general atmospheric boundary layer flows (beneficial winds). Current power curve modeling primarily focuses on uniform and shear flows, and has not yet incorporated the low-level jet stream.

[0003] Currently, the control strategy uses rated wind speed as the standard for dividing the wind turbine control range, with different control strategies before and after the rated wind speed. In the range below the rated wind speed but above the cut-off wind speed, the wind turbine control objective is to track the optimal tip speed ratio to maximize wind energy capture. Using real-time hub wind speed and the optimal tip speed ratio determined based on the wind turbine power coefficient surface, the target generator speed is calculated, and the generator torque is adjusted via a PI controller to track this speed, ultimately maximizing wind energy capture. In the range above the design rated wind speed but below the cut-off wind speed, the wind turbine control objective is to maintain rated power output. The pitch angle is adjusted to limit aerodynamic torque, thereby maintaining a constant speed and keeping the wind turbine at rated power. However, under the influence of low-level jet streams, the actual rated wind speed is delayed compared to the design rated wind speed, but the design rated wind speed is still used as the control standard. When the hub wind speed exceeds the rated wind speed, the wind turbine limits its torque by adjusting the pitch angle, resulting in a need for a higher wind speed for the wind turbine to operate at full capacity. This measure of actively adjusting the pitch angle in the transition zone actually results in a waste of wind power. Summary of the Invention

[0004] The purpose of this invention is to propose a wind turbine control method, system, medium, and computer device based on the power curve under low-altitude jet stream. By measuring the wind speed at different altitudes and establishing a real-time power curve model, the wind turbine control range can be accurately divided, and the operating status of the wind turbine can be actively adjusted to improve the power generation under the action of low-altitude jet stream.

[0005] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0006] In a first aspect, the present invention proposes a wind turbine control method based on the power curve under low-altitude jet stream, comprising:

[0007] Obtain measured wind field data;

[0008] Input the measured wind field data into the wind turbine power curve model to obtain the current power curve;

[0009] The wind turbine control range is divided according to the current power curve, and the operating status of the wind turbine is adjusted accordingly.

[0010] The construction of the wind turbine power curve model includes:

[0011] Obtain wind turbine model and historical wind farm data;

[0012] Numerical simulations were performed on the wind turbines based on the wind turbine model and historical wind farm data to obtain a wind turbine power curve model that takes into account the sensitivity of low-level jet streams.

[0013] Furthermore, the historical wind farm data includes historical hub height wind speed. The determination of the historical hub height wind speed includes: determining the hub height according to the wind turbine model, and extracting the corresponding wind speed data from meteorological data based on the hub height.

[0014] Furthermore, the step of performing numerical simulations on the wind turbine based on the wind turbine model and historical wind farm data to obtain a wind turbine power curve model considering the sensitivity of low-level jet streams includes:

[0015] Sensitive characteristic parameters of the low-level jet stream are obtained based on the historical hub height wind speed, and the sensitive characteristic parameters include jet height and jet intensity;

[0016] The corresponding power curve coefficients are obtained based on the aforementioned sensitive characteristic parameters;

[0017] A power curve model is constructed using the power curve coefficients.

[0018] Further, obtaining the corresponding power curve coefficients based on the sensitive feature parameters includes:

[0019] Introducing a dimensionless parameter as a relative value:

[0020] ;

[0021] In the formula, Relative value To achieve a jet intensity of Hub wind speed for Under the condition of reference jet height Low-level jet stream power density at the location; To achieve a jet intensity of Hub wind speed for Under the condition of rapid flow height Low-level jet stream power density at the location This is a wind speed sequence used to determine the hub wind speed. scope;

[0022] A mapping relationship between the relative values ​​and jet intensity and the power curve coefficients is established using a quadratic polynomial, and the power curve coefficients of each item are obtained by fitting.

[0023] Furthermore, the construction of the power curve model using the power curve coefficients includes:

[0024] For the nonlinear growth segment of the hub wind speed range before reaching rated power, an exponential function was used for fitting, and a power curve model under different combinations of low-level jet stream sensitive characteristic parameters was established.

[0025] Furthermore, the step of dividing the wind turbine control range according to the current power curve and adjusting the wind turbine operating status includes:

[0026] The rated wind speed under the action of the low-level jet stream is determined based on the current power curve.

[0027] The rated wind speed is used as the standard for dividing the control zone of wind turbine units:

[0028] When the hub wind speed is greater than the cut-in wind speed but less than the rated wind speed, the target generator speed is calculated based on the hub wind speed and the preset optimal tip speed ratio, and the generator electromagnetic torque is adjusted to make the generator speed track the target generator speed.

[0029] When the hub wind speed is greater than the rated wind speed but less than the cut-out wind speed, the rotor pitch angle is adjusted to limit the aerodynamic torque, so that the generator speed and output power are maintained at the rated speed and the rated power.

[0030] Secondly, the present invention proposes a wind turbine control system based on the power curve under low-altitude jet stream, including a wind field measurement module, a current power curve determination module, and a wind turbine control module.

[0031] The wind farm measurement module is used to acquire wind turbine model and historical wind farm data.

[0032] The current power curve module is used to input the measured wind field data into the wind turbine power curve model to obtain the current power curve.

[0033] The wind turbine control module is used to divide the wind turbine control range according to the power curve model and regulate the wind turbine operation status.

[0034] Thirdly, the present invention proposes a computer-readable storage medium storing a computer program / instruction thereon, which, when executed by a processor, implements the steps of the wind turbine control method based on the power curve under low-altitude jet stream.

[0035] Fourthly, the present invention provides a computer device comprising:

[0036] Memory, used to store computer programs / instructions;

[0037] A processor for executing the computer program / instructions to implement the steps of a wind turbine control method based on a power curve under low-altitude jet stream.

[0038] Compared with the prior art, the present invention has the following advantages and technical effects:

[0039] This invention establishes a power curve under the action of a low-altitude jet stream by measuring wind speed at different altitudes, determines the rated wind speed under the action of the low-altitude jet stream, and thus redefines the control zone. This allows for proactive regulation of the wind turbine's operating status, reducing the wind power waste caused by the current control strategy's division based on the design rated wind speed, and maximizing the utilization of wind energy between the design rated wind speed and the actual rated wind speed. Attached Figure Description

[0040] Figure 1 A schematic diagram illustrating the calculation process of the power curve coefficient of a wind turbine under the action of a low-altitude jet stream, provided as an embodiment of the present invention;

[0041] Figure 2 A flowchart illustrating a wind turbine control method based on a power curve under low-altitude jet stream, provided as an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the arrangement of the wind field measurement device provided in an embodiment of the present invention. Detailed Implementation

[0043] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use.

[0044] Example 1:

[0045] This embodiment takes the NERL 15MW wind turbine as an example and proposes a calculation process for the power curve coefficient of a wind turbine under the action of a low-altitude jet stream, such as... Figure 1 As shown.

[0046] Obtain wind turbine model and historical wind farm data. The historical wind farm data includes historical hub height wind speed. Determine the hub height based on the wind turbine model, and extract the corresponding wind speed data from meteorological data based on the hub height as the historical hub height wind speed.

[0047] Based on wind turbine model and historical wind field data of wind farms, low-level jet stream wind fields under different sensitive characteristic parameter values ​​are simulated. These low-level jet stream characteristic parameters jointly determine the wind energy contained in the incoming flow at the wind turbine surface. However, the relationship between the jet stream height parameter and the power curve coefficient is nonlinear. Therefore, a dimensionless parameter R is introduced to represent the relative value of the wind energy contained in the low-level jet stream at different jet stream heights under the same jet intensity. The calculation formula is as follows:

[0048] ;

[0049] In the formula, R is a relative value used to measure the magnitude of wind power density at different jet heights; To achieve a jet intensity of Hub wind speed for Under the condition of reference jet height Low-level jet stream power density, jet intensity Taken as 1 m / s, the reference jet height Take 150m as the value. To achieve a jet intensity of Hub wind speed for Under the condition of rapid flow height Low-level jet stream power density at the location This is a wind speed sequence used to determine the hub wind speed. The range covers speeds from 5 m / s to 13 m / s;

[0050] Establish the relative value R and jet intensity using a quadratic polynomial. The mapping relationship between the coefficients and the power curve is used to obtain different relative values ​​of R and u. m The formulas for calculating the power curve coefficients a, b, and c corresponding to the combination are:

[0051] ;

[0052] In the formula, a, b, and c are power curve coefficients. All of these are coefficients of the fitted power curve; the coefficients obtained from the fitting are shown in Table 1.

[0053] Table 1. Values ​​of coefficients a, b, and c for the fitted power curve

[0054]

[0055] Example 2:

[0056] This embodiment, based on Embodiment 1, proposes a wind turbine control method based on the power curve under low-altitude jet stream, such as... Figure 2 As shown.

[0057] Acquire wind field data at different heights within the wind turbine model and wind speed measurement area;

[0058] Sensitive characteristic parameters of the low-level jet stream are obtained based on wind field data, including any jet stream height. and jet intensity ;

[0059] Calculate the relative value R of the jet height under the premise of a jet intensity of 3 m / s;

[0060] Based on jet intensity The relative value R is obtained by using a quadratic polynomial to obtain the corresponding power curve coefficients a, b, c under the premise of jet intensity of 3 m / s;

[0061] Based on the power curve coefficient, for the nonlinear growth segment of the wind turbine before reaching its rated power in the hub wind speed range of 5 m / s to 13 m / s, an exponential function was used for fitting, and a power curve model under different combinations of low-level jet stream sensitive characteristic parameters was established. The formula for calculating the wind turbine's power generation is as follows:

[0062] ;

[0063] In the formula, The power generation of the wind turbine under different hub wind speeds under low-level jet characteristics is represented by u, where u is the hub wind speed of the wind turbine, and a, b, and c are power curve coefficients. The rated power is defined as follows: In this embodiment, the power generation of the wind turbine is divided into 24 categories based on the values ​​of the sensitive characteristic parameters, which can cover the range of values ​​of the low-altitude jet stream sensitive parameters in this embodiment. Among them, the power of the wind turbine is in the range of 5-13m / s, which is before the rated power, while it will reach the rated power when it exceeds 13m / s.

[0064] The control range of the wind turbine is redefined based on the power curve model, and then the operating status of the wind turbine is adjusted accordingly.

[0065] Example 3:

[0066] This embodiment proposes a wind turbine control system based on the power curve under low-altitude jet stream, building upon Embodiment 2. This system is based on... Figure 3 The wind field measurement device shown includes a wind field measurement module, a curve model determination module, and a wind turbine control module;

[0067] The wind farm measurement module is used to acquire wind turbine model and historical wind farm data;

[0068] The curve model determination module is used to perform numerical simulation of wind turbines based on the turbine model and historical wind farm data of the wind farm, and obtain a wind turbine power curve model that takes into account the sensitivity of low-level jet streams.

[0069] The wind turbine control module is used to divide the wind turbine control range according to the power curve model and regulate the wind turbine operation status.

[0070] Example 4:

[0071] This embodiment proposes a computer-readable storage medium based on embodiment two, on which a computer program / instruction is stored. When the computer program / instruction is executed by a processor, it implements the steps of a wind turbine control method based on a power curve under low-altitude jet stream.

[0072] Example 5:

[0073] This embodiment proposes a computer device based on Embodiment 2, including:

[0074] Memory, used to store computer programs / instructions;

[0075] A processor for executing the computer program / instructions to implement the steps of a wind turbine control method based on a power curve under low-altitude jet stream.

[0076] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0077] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1A device that provides the functions specified in one or more boxes.

[0078] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0079] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0080] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A wind turbine control method based on the power curve under low-altitude jet stream, characterized in that, include: Obtain measured wind field data; Input the measured wind field data into the wind turbine power curve model to obtain the current power curve; The wind turbine control range is divided according to the current power curve, and the operating status of the wind turbine is adjusted accordingly. The construction of the wind turbine power curve model includes: Obtain wind turbine model and historical wind farm data; Numerical simulations were performed on the wind turbines based on the wind turbine model and historical wind farm data to obtain a wind turbine power curve model that takes into account the sensitivity of low-level jet streams.

2. The wind turbine control method based on the power curve under low-altitude jet stream according to claim 1, characterized in that, The historical wind farm data includes historical hub height wind speed. The determination of the historical hub height wind speed includes: determining the hub height according to the wind turbine model, and extracting the corresponding wind speed data from meteorological data based on the hub height.

3. The wind turbine control method based on the power curve under low-altitude jet stream according to claim 2, characterized in that, The step of performing numerical simulations on the wind turbines based on the wind turbine model and historical wind farm data to obtain a wind turbine power curve model that considers the sensitivity of low-level jet streams includes: Sensitive characteristic parameters of the low-level jet stream are obtained based on the historical hub height wind speed, and the sensitive characteristic parameters include jet height and jet intensity; The corresponding power curve coefficients are obtained based on the aforementioned sensitive characteristic parameters; A power curve model is constructed using the power curve coefficients.

4. The wind turbine control method based on the power curve under low-altitude jet stream according to claim 3, characterized in that, The step of obtaining the corresponding power curve coefficients based on the sensitive feature parameters includes: Introducing a dimensionless parameter as a relative value: ； In the formula, Relative value To achieve a jet intensity of Hub wind speed for Under the condition of reference jet height Low-level jet stream power density at the location; To achieve a jet intensity of Hub wind speed for Under the condition of rapid flow height Low-level jet stream power density at the location This is a wind speed sequence used to determine the hub wind speed. scope; A mapping relationship between the relative values ​​and jet intensity and the power curve coefficients is established using a quadratic polynomial, and the power curve coefficients of each item are obtained by fitting.

5. The wind turbine control method based on the power curve under low-altitude jet stream according to claim 3, characterized in that, The construction of the power curve model using the power curve coefficients includes: for the nonlinear growth segment of the hub wind speed range before reaching rated power, an exponential function is used for fitting, and a power curve model under different combinations of low-altitude jet stream sensitive characteristic parameters is established.

6. The wind turbine control method based on the power curve under low-altitude jet stream according to claim 1, characterized in that, The step of dividing the wind turbine control range according to the current power curve and adjusting the wind turbine operating status includes: Determine the rated wind speed under the influence of the low-level jet stream based on the current power curve. The rated wind speed is used as the standard for dividing the control zone of wind turbine units: When the hub wind speed is greater than the cut-in wind speed but less than the rated wind speed, the target generator speed is calculated based on the hub wind speed and the preset optimal tip speed ratio, and the generator electromagnetic torque is adjusted to make the generator speed track the target generator speed. When the hub wind speed is greater than the rated wind speed but less than the cut-out wind speed, the rotor pitch angle is adjusted to limit the aerodynamic torque, so that the generator speed and output power are maintained at the rated speed and the rated power.

7. A wind turbine control system based on a power curve under low-altitude jet stream, characterized in that, It includes a wind farm measurement module, a current power curve determination module, and a wind turbine control module; The wind farm measurement module is used to acquire wind turbine model and historical wind farm data. The current power curve module is used to input the measured wind field data into the wind turbine power curve model to obtain the current power curve. The wind turbine control module is used to divide the wind turbine control range according to the power curve model and regulate the wind turbine operation status.

8. A computer-readable storage medium having a computer program / instructions stored thereon, characterized in that, When the computer program / instruction is executed by the processor, it implements the steps of the wind turbine control method based on the power curve under low-altitude jet stream as described in any one of claims 1 to 6.

9. A computer device, characterized in that, include: Memory, used to store computer programs / instructions; A processor for executing the computer program / instructions to implement the steps of the wind turbine control method based on the power curve under low-altitude jet stream as described in any one of claims 1 to 6.

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