Wind turbine generator control method, device, and program product
By obtaining the relationship between the operating parameters of the wind turbine generator and the pitch angle, the pitch angle is adjusted to optimize the output power, which solves the problem of insufficient power in the grid-connected speed control stage and realizes efficient power generation at low wind speeds.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- GOLDWIND PIONEER TECHNOLOGY (YANCHENG) CO LTD
- Filing Date
- 2025-12-31
- Publication Date
- 2026-07-30
AI Technical Summary
During the grid-connected speed control phase of wind turbine generators, existing technologies lack effective adjustment of the pitch angle, resulting in suboptimal power coefficient, failure to fully utilize wind energy, and insufficient output power.
By acquiring the operating parameters of the wind turbine generator set, it is determined whether the conditions for the grid-connected speed control stage are met. The correspondence between the control parameters and the pitch angle is obtained, the target pitch angle data is determined based on this relationship, and the pitch angle is adjusted accordingly to optimize the output power.
Increasing the output power of wind turbine generators at low wind speeds improves power generation and enables more efficient utilization of wind energy.
Smart Images
Figure CN2025148054_30072026_PF_FP_ABST
Abstract
Description
Control methods, equipment and procedures for wind turbine generator sets
[0001] This application claims priority to Chinese Patent Application No. 202510105164.9, filed on January 22, 2025, entitled "A Control Method, Device and Program Product for a Wind Turbine Generator", and Chinese Patent Application No. 202512033781.5, filed on December 30, 2025, entitled "A Control Method, Device and Program Product for a Wind Turbine Generator", the entire contents of which are incorporated herein by reference. Technical Field
[0002] This application relates to the field of wind power technology, specifically to a control method, equipment, and program product for a wind turbine generator set. Background Technology
[0003] During operation, when the generator's output power is less than the rated power, the pitch angle remains constant at zero degrees. When the generator's output power is equal to or greater than the rated power, the pitch angle is adjusted according to the change in output power to maintain the generator's output power at the rated power. By adjusting the pitch angle, wind energy is fully utilized, and the wind turbine is protected from damage caused by excessively high wind speeds.
[0004] Under certain operating conditions, the output power of wind turbine generators is relatively low. Summary of the Invention
[0005] In view of this, a control method, device and program product for wind turbine generator sets are provided, which can improve the output power of wind turbine generator sets during the grid-connected speed control stage.
[0006] One aspect of this application provides a control method for a wind turbine generator set. The method includes:
[0007] The operating parameters of the wind turbine generator set are obtained, including rotor speed and motor torque.
[0008] If the operating parameters are determined to meet the control conditions, the control parameters are obtained. The control conditions are used to determine that the wind turbine generator set is in the grid-connected speed control stage.
[0009] Obtain the first correspondence between control parameters and propeller pitch angle;
[0010] Based on the control parameters and the first correspondence between the control parameters and the pitch angle, the target pitch angle data corresponding to the control parameters is determined;
[0011] The wind turbine generator set is controlled based on the target pitch angle data.
[0012] A second aspect of this application provides a control device for a wind turbine generator set. The device includes:
[0013] The first acquisition module is used to acquire the operating parameters of the wind turbine generator set, including the rotor speed and the motor torque.
[0014] The second acquisition module is used to acquire control parameters when it is determined that the operating parameters meet the control conditions, wherein the control conditions are used to determine that the wind turbine generator set is in the grid-connected speed control stage.
[0015] The third acquisition module is used to acquire the first correspondence between control parameters and pitch angle;
[0016] The determining module is used to determine the target pitch angle data corresponding to the control parameters based on the control parameters and the first correspondence between the control parameters and the pitch angle;
[0017] The control module is used to control the wind turbine generator set based on the target pitch angle data.
[0018] A third aspect of this application provides an electronic device, comprising:
[0019] One or more processors;
[0020] Storage device, on which one or more programs are stored,
[0021] When the one or more programs are executed by the one or more processors, the one or more processors implement the control method for the wind turbine generator described above.
[0022] A fourth aspect of this application provides a computer program product that, when run on a device, causes the device to execute the aforementioned wind turbine generator control method.
[0023] The fifth aspect of this application provides a wind turbine generator set, the wind turbine generator set including a controller, the controller being used to execute the control method of the wind turbine generator set described above.
[0024] The control method for this wind turbine generator set acquires its operating parameters, including rotor speed and motor control torque. These parameters determine the current operating stage of the wind turbine generator set. The method then checks if the operating parameters meet control conditions, which are used to determine if the wind turbine generator set is in the grid-connected speed control stage. If the operating parameters meet the control conditions, the control parameters are acquired. A first correspondence between the control parameters and the pitch angle is obtained. This first correspondence guides the adjustment of the wind turbine generator set's pitch angle. Based on the control parameters and the first correspondence, the target pitch angle data corresponding to the control parameters is determined. This target pitch angle data represents the pitch angle that allows the wind turbine generator set to achieve optimal output power under the current operating conditions. The wind turbine generator set is then controlled based on the target pitch angle data. Thus, during the grid-connected speed control stage, the wind turbine generator set's pitch angle is optimized based on its control parameters, thereby increasing its output power and improving power generation even at low wind speeds. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 shows a schematic diagram of the operation stages of a wind turbine generator set;
[0027] Figure 2 shows a schematic diagram of a blade;
[0028] Figure 3 shows a schematic diagram of the performance curves of a wind turbine generator set;
[0029] Figure 4 shows a schematic diagram of another type of blade;
[0030] Figure 5 shows a schematic diagram of the performance curves of another type of wind turbine generator set;
[0031] Figure 6 shows a schematic diagram of another type of blade;
[0032] Figure 7 is a schematic diagram of the application scenario of the control method of the wind turbine generator set according to an embodiment of this application;
[0033] Figure 8 is a flowchart illustrating a control method for a wind turbine generator set provided in an embodiment of this application;
[0034] Figure 9 is a schematic diagram of the performance curve of a wind turbine generator set in the control method of the wind turbine generator set according to an embodiment of this application;
[0035] Figure 10 is a schematic diagram of a wind speed probability distribution curve;
[0036] Figure 11 illustrates a schematic diagram of the third correspondence;
[0037] Figure 12 illustrates a schematic diagram of the first correspondence;
[0038] Figure 13 illustrates the relationship between pitch angle and wind speed.
[0039] Figure 14 illustrates a schematic diagram of power variation;
[0040] Figure 15 is a schematic diagram illustrating another relationship between pitch angle and wind speed;
[0041] Figure 16 is a schematic diagram of the structure of a control device for a wind turbine generator set provided in an embodiment of this application;
[0042] Figure 17 is a schematic diagram of another correspondence between pitch angle and wind speed provided in an embodiment of this application;
[0043] Figure 18 is a schematic diagram of the correspondence between pitch angle and power provided in an embodiment of this application. Detailed Implementation
[0044] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the embodiments of this application will be further described in detail below with reference to the accompanying drawings and specific implementation methods.
[0045] To facilitate understanding and explanation of the technical solutions provided in the embodiments of this application, the background technology involved in the embodiments of this application will be introduced first.
[0046] Currently, wind turbines are primarily pitch-regulated wind turbines, where the blade angle can be adjusted according to changes in wind speed. The operation of a wind turbine can be divided into four stages based on wind speed. See Figure 1, which illustrates these stages. The horizontal axis represents wind speed, and the vertical axis represents numerical values. Line A represents the wind turbine's rotational speed. Line B represents the wind turbine's power output. Line C represents the wind turbine's pitch angle. In Figure 1, the first stage is the grid-connected speed control stage. The second stage is the optimal gain control stage, also known as the optimal tip speed ratio control stage. The third stage is the torque closed-loop control stage. The fourth stage is the pitch angle closed-loop control stage. Closed-loop control is a control method where the controlled output is fed back to the control input, exerting a control effect on the input.
[0047] The grid-connected speed control stage refers to the control phase in which the wind turbine's speed is maintained at the minimum speed by the motor torque. In this stage, the first phase, the wind turbine's power gradually increases with wind speed. Once the grid-connected torque is reached, the wind turbine's control switches to the optimal gain control stage, the second phase. Optimal gain control strategy refers to using the optimal gain control method when the wind turbine's speed is below its rated speed, ensuring the wind turbine operates at its optimal power coefficient. In the second phase, the wind turbine is in the open-pitch state. The blade pitch angle is a fixed value, the minimum pitch angle, typically around 0°. After the wind turbine reaches its rated speed, it enters the third phase. In the third phase, the wind turbine's speed reaches the rated speed, but the output power does not reach the rated power. The pitch angle remains open. After the wind turbine's output power reaches the rated power, it enters the fourth phase. In the fourth stage, the wind turbine generator sets reach their rated power, and the rotational speed of the wind turbine generator sets is controlled by the pitch angle.
[0048] Blade element momentum theory is a method for calculating the aerodynamic loads on wind turbine blades. A blade element is a series of micro-segments along the span of the wind turbine blade. Blade element momentum theory combines momentum theory with the principle of force balance in two-dimensional airfoils, obtaining a closed-form solution by iteratively solving the momentum equation. Based on blade element momentum theory, the aerodynamic characteristics of a two-dimensional airfoil are analyzed, as shown in Figure 2, which is a schematic diagram of a blade. Here, α represents the angle of attack, which is the angle between the airflow velocity vector and the airfoil chord. γ represents the inflow angle, which is the angle formed by the blade element linear velocity and the incoming flow velocity. θ p θ represents the propeller pitch angle. a This represents the aerodynamic twist angle corresponding to a blade element. β represents the torsional deformation corresponding to a certain blade element. When the blade torsional deformation is small, β≈0°. W is the flow velocity. L represents lift, and D represents drag. V X For axial induced wind speed, V Y This refers to the circumferential induced velocity.
[0049] In the first stage, which is the grid-connected speed control stage, as the wind speed increases, the inflow angle of the wind turbine blades continuously increases, the blades deviate from the optimal angle of attack, resulting in a decrease in the power coefficient, which in turn causes the wind turbine to fail to achieve the optimal output power.
[0050] For example, Figure 3 shows a schematic diagram of the performance curves of a wind turbine generator set, where the wind turbine generator set is a pitch angle adjustable type. The horizontal axis represents rotational speed, and the vertical axis represents shaft power. The marked points in Figure 3 indicate that the wind turbine generator set is in the start-up state. Referring to Figure 4, at a wind speed of U, the pitch angle is maintained near 0°. For a specific blade element, the corresponding angle of attack is α, and the angle of attack for the optimal lift-to-drag ratio is α. * The blades were not operating at the angle of attack corresponding to their optimal lift-to-drag ratio, resulting in a non-optimal power coefficient for the entire blade system.
[0051] Furthermore, as wind speed gradually increases, referring to Figures 5 and 6, under the operating conditions corresponding to the marked points, an increase in wind speed ΔU leads to a gradual increase in the angle of attack of the wind turbine generator. Under this operating condition, the pitch angle corresponding to the optimal power coefficient changes again.
[0052] Currently, during the grid-connected speed control phase, there is a lack of adjustment for the pitch angle of the wind turbine generator set, resulting in a non-optimal power coefficient. Consequently, the output power of the wind turbine generator set cannot reach the optimal output power, and wind energy is not fully utilized.
[0053] This disclosure provides a control method, device, and program product for a wind turbine generator set. In this method, operating parameters of the wind turbine generator set are acquired. These operating parameters include rotor speed and motor torque. The operating stage of the wind turbine generator set can be determined based on these parameters. It is then determined whether the operating parameters meet control conditions. These control conditions are used to determine if the wind turbine generator set is in the grid-connected speed control stage. If the operating parameters meet the control conditions, control parameters are acquired. A first correspondence between the control parameters and the pitch angle is acquired. This first correspondence guides the adjustment of the wind turbine generator set's pitch angle. Based on the control parameters and the first correspondence between the control parameters and the pitch angle, target pitch angle data corresponding to the control parameters is determined. The determined target pitch angle data is the pitch angle data that allows the wind turbine generator set to achieve optimal output power under the current operating state. The wind turbine generator set is controlled based on the target pitch angle data. Thus, during the grid-connected speed control stage, the pitch angle of the wind turbine generator set is optimized based on its control parameters, thereby increasing the output power of the wind turbine generator set and improving its power generation even at low wind speeds.
[0054] To facilitate understanding of the technical solutions provided in the embodiments of this application, the following description, in conjunction with Figure 7, illustrates a control method for a wind turbine generator set provided in the embodiments of this application.
[0055] The control method for this wind turbine generator set can be applied to the control system of wind turbine generator sets. Taking shaft power as the control parameter as an example, as shown in Figure 7, the control system includes three modules: an analysis module, a detection module, and a control module. The analysis module is used to analyze the performance of the wind turbine generator set, obtaining the first correspondence between shaft power and pitch angle based on tip speed ratio and blade element momentum theory. The first correspondence between shaft power and pitch angle is represented by a table of shaft power - pitch angle. The detection module is used to acquire operating parameters, and, when it is determined that the wind turbine generator set is in the grid-connected speed control stage based on the operating parameters, acquires the shaft power. Operating parameters include, for example, rotor speed.
[0056] The control module is used to determine the target pitch angle data corresponding to the shaft power based on the shaft power and the first correspondence between the shaft power and the pitch angle, and to control the wind turbine generator set based on the target pitch angle data.
[0057] As an example, the analysis module acquires minimum thresholds for wind speed and rotor speed. Based on these minimum thresholds, the analysis module calculates a first correspondence between control parameters and pitch angle. For example, the control parameter might be shaft power. Shaft power is the aerodynamic power of the wind turbine generator. This aerodynamic power excludes electrical and mechanical losses. The analysis module sends this first correspondence to the detection module. The detection module acquires operating parameters, including rotor speed and motor torque. Based on these operating parameters, the detection module determines that the wind turbine generator is in the grid-connected speed control phase. The detection module sends control commands to the control module. The control module acquires the control parameters and, according to the first correspondence, determines the target pitch angle data corresponding to the control parameters. The control module then controls the wind turbine generator based on the target pitch angle data.
[0058] Those skilled in the art will understand that the schematic diagram shown in Figure 7 is merely one example in which embodiments of this application can be implemented. The scope of application of the embodiments of this application is not limited by any aspect of the schematic diagram. The analysis module, detection module, and control module shown in Figure 7 are, for example, virtual modules based on functional partitioning. The three modules shown in Figure 7 can also have other functions. For example, the control module also calls a proportional-integral (PI) controller to calculate the motor torque and controls the wind turbine generator set based on the motor torque.
[0059] The following describes a control method for a wind turbine generator set provided in an embodiment of this application.
[0060] Referring to Figure 8, which is a flowchart illustrating a control method for a wind turbine generator provided in an embodiment of this application, the method includes:
[0061] S801: Obtain the operating parameters of the wind turbine generator set.
[0062] The operating parameters of a wind turbine generator set reflect its current control stage. These parameters include rotor speed and motor torque. The control stage of the wind turbine generator set is determined based on these parameters.
[0063] This application does not limit the method of acquiring the operating parameters of the wind turbine generator. In one possible implementation, operating parameters are acquired within each pre-set operating parameter acquisition cycle. In another possible implementation, operating parameters are acquired in real time.
[0064] S802: Obtain control parameters after determining that the operating parameters meet the control conditions.
[0065] Control conditions are used to determine whether the wind turbine generator is in the grid-connected speed control phase. Control conditions may include, for example, a rotor speed difference less than or equal to a minimum rotor speed threshold, and a motor torque less than a grid-connected control torque threshold. The minimum rotor speed threshold, the difference threshold, and the grid-connected control torque threshold are all preset values. As an example, the difference threshold is 0. That is, the control conditions are: rotor speed at the minimum rotor speed threshold, and motor torque less than the grid-connected control torque threshold.
[0066] If the operating parameters meet the control conditions, it indicates that the wind turbine generator is in the grid-connected speed control phase. During this phase, the pitch angle of the wind turbine generator needs to be adjusted to achieve optimal output power. Output power, for example, is the shaft power.
[0067] When the wind turbine generator is in the grid-connected speed control phase, control parameters are acquired. These control parameters are used to determine the value of the pitch angle. The embodiments of this application do not limit the specific type of the control parameters. As an example, the control parameter is shaft power. As another example, the control parameter is motor torque. As yet another example, the control parameter is wind speed.
[0068] S803: Obtain the first correspondence between control parameters and pitch angle.
[0069] The initial correspondence between control parameters and pitch angle can be preset. As an example, this initial correspondence is stored in a data table. This initial correspondence can be calibrated or pre-calculated. Alternatively, it can be calculated in real-time.
[0070] As an example, embodiments of this application provide a possible implementation of calculating the first correspondence between control parameters and pitch angle, such as including steps A1 and A2.
[0071] A1: Obtain the second correspondence between tip speed ratio, control parameters, and pitch angle.
[0072] As an example, the second correspondence between tip speed ratio, control parameters, and pitch angle can be determined through calibration.
[0073] As another example, the second correspondence between tip speed ratio, control parameters, and pitch angle is determined based on the third and fourth correspondences. The third correspondence is the relationship between tip speed ratio, power coefficient of the wind turbine generator, and pitch angle. The fourth correspondence is the relationship between power coefficient and control parameters.
[0074] The third correspondence will be introduced first.
[0075] Under otherwise constant conditions, the tip speed ratio of a wind turbine affects its power coefficient. A higher tip speed ratio results in higher output power. The effect of the tip speed ratio on power can be represented by a wind turbine aerodynamic curve. Figure 9 shows a schematic diagram of the wind turbine's performance curve in the control method of this embodiment. The wind turbine's performance curve is used to describe the power coefficient C of the wind turbine. p The variation law of the tip speed ratio λ is also called C p The -λ curve. The performance curve of a wind turbine generator describes the relationship between the tip speed ratio and the power coefficient. The highest power coefficient is the optimal power coefficient. The tip speed ratio corresponding to the optimal power coefficient can be expressed as λ. opt .
[0076] Furthermore, the pitch angle θ p It will also affect the power factor C. p Power factor C p With pitch angle θ p There is a third correspondence between the tip speed ratio λ and the power factor C. This third correspondence can be described by the wind turbine aerodynamic surface. The wind turbine aerodynamic surface describes the power factor C. p With the tip speed ratio λ and the propeller pitch angle θ p The curved surface is formed by the changing pattern of the surface.
[0077] This application provides a possible implementation method for calculating the third correspondence relationship.
[0078] The expression for the third correspondence is shown in formula (1):
[0079] Where, λ r λ represents the local tip speed ratio of the blade element, and λ represents the tip speed ratio of the wind turbine generator. a represents the axial induction factor, and b represents the circumferential induction factor.
[0080] The expressions for the axial induction factor a and the circumferential induction factor b are as follows:
[0081] Among them, C n C is the normal thrust coefficient. t γ is the tangential thrust coefficient. F is the Prandtl correction factor, used to correct for losses at the blade root and tip of the wind turbine. γ is the inflow angle. σ is the realism.
[0082] Normal thrust coefficient C n and tangential thrust coefficient C t The lift coefficient C of the blade section can be used to determine this. l and drag coefficient C d See formulas (4) and (5) for details. n =C l cosγ+C d sinγ (4) C t =C l sinγ-C d cosγ (5)
[0083] The expression for F is:
[0084] Where B is the number of blades, R is the rotor radius, and r is the blade radius.
[0085] The realness σ is:
[0086] Where B is the number of blades and c is the chord length.
[0087] The inflow angle γ can be expressed as: γ = α + θ p (8)
[0088] Where, θ p Let α be the pitch angle and α be the angle of attack. The angle of attack α is related to the lift coefficient C. l and drag coefficient C d There is a corresponding relationship. Angle of attack α and lift coefficient C land drag coefficient C d The correspondence can be determined by experimental results.
[0089] Thus, based on a given angle of attack α, the inflow angle γ and the propeller pitch angle θ can be determined. p The correspondence between them, and the determination of the lift coefficient C l and drag coefficient C d The values are based on the inflow angle γ and the pitch angle θ. p The correspondence between them, as well as formulas (4) and (5), allows us to obtain the normal thrust coefficient C. n With pitch angle θ p The correspondence between them, and the tangential thrust coefficient C t With pitch angle θ p The correspondence between them.
[0090] Based on the inflow angle γ and the pitch angle θ p The correspondence between them, the normal thrust coefficient C n With pitch angle θ p The correspondence between them, tangential thrust coefficient C t With pitch angle θ p Based on the correspondence between them, and formulas (2) and (3), the axial induction factor a and the pitch angle θ are obtained. p The correspondence between them, and the relationship between the circumferential induction factor b and the pitch angle θ p The correspondence between them.
[0091] Finally, based on the axial induction factor a and the pitch angle θ p The correspondence between the circumferential induction factor b and the propeller pitch angle θ p Based on the correspondence between them and formula (1), the power coefficient C is obtained. p With tip speed ratio λ and pitch angle θ p The correspondence between them.
[0092] In addition, the power coefficient C p There is also a fourth correspondence between this and the control parameters. For example, the control parameter is shaft power. The expression for this fourth correspondence is:
[0093] Where P is shaft power, V ∞ ρ is the wind speed, ρ is the air density, and A is the swept area of the wind turbine.
[0094] Thus, by combining the third and fourth correspondences, a second correspondence between the tip speed ratio, control parameters, and pitch angle can be obtained. The expression for the second correspondence is given in formula (10):
[0095] Wherein, the axial induction factor a is related to the pitch angle θ p There is a corresponding relationship between them, as well as the circumferential induction factor b and the pitch angle θ. p There is a corresponding relationship between them: air density ρ, swept area of the wind turbine A, and wind speed V. ∞ The local tip rate ratio λ of folin r All of these are known quantities.
[0096] Thus, based on blade element momentum theory, by integrating the local power coefficients of blade elements at different locations on the wind turbine blades, the overall power coefficient of the wind turbine is determined, resulting in a third correspondence between the wind turbine's power coefficient and tip speed ratio and pitch angle. Furthermore, from the perspective of the efficiency of converting wind kinetic energy into mechanical energy, the power coefficient of the wind turbine is determined, resulting in a fourth correspondence between the wind turbine's power coefficient and control parameters. Based on the power coefficient parameter shared by the third and fourth correspondences, a second correspondence between tip speed ratio, control parameters, and pitch angle can be determined. Furthermore, given a determined tip speed ratio, a first correspondence between control parameters and pitch angle can be determined, enabling the adjustment of the pitch angle using the first correspondence and the obtained control parameter values.
[0097] In one possible implementation, given that the power coefficient of the wind turbine meets predetermined conditions, a second correspondence between the tip speed ratio, control parameters, and pitch angle is determined based on a third and a fourth correspondence.
[0098] As an example, a predetermined condition is that the power factor is greater than or equal to a power factor threshold. The power factor threshold is a threshold determined based on the degree of wind energy utilization.
[0099] Thus, after determining the first correspondence based on the second correspondence, the pitch angle can be adjusted using the first correspondence. The adjusted wind turbine has a higher power coefficient, which can improve the shaft power and power generation of the wind turbine.
[0100] As another example, the predetermined condition is that the power coefficient is the optimal power coefficient. The optimal power coefficient is the power coefficient with the largest value within the range of possible power coefficient values. In this way, the optimal pitch angle adjustment effect can be achieved.
[0101] A2: Obtain the value of the tip speed ratio.
[0102] The tip speed ratio can be determined based on the wind speed and impeller speed, as shown in the following formula:
[0103] R is the impeller radius. Ω is the impeller speed. V ∞ This refers to wind speed.
[0104] In one possible implementation, the tip speed ratio is a preset fixed value. For example, the wind speed is a reference wind speed determined based on local meteorological data for the wind turbine. The rotor speed is a preset minimum rotor speed threshold.
[0105] Based on local meteorological data for the wind turbine generators, an annual wind speed probability distribution curve was plotted. As shown in Figure 10, the wind speed probability distribution curve follows a Weibull distribution. The Weibull distribution curve represents a continuous probability distribution. The probability density is given by the following formula:
[0106] Among them, V ave This represents the annual average wind speed. V k is the shape factor. V is the wind speed variable, which is usually used to describe the probability of wind speed occurring in a certain area.
[0107] The rated wind speed of the wind turbine generator is determined based on the wind speed probability distribution curve. The rated wind speed is used as the reference wind speed.
[0108] In another possible implementation, the rotor radius of the wind turbine is obtained. The wind speed and the rotor speed of the wind turbine are obtained. Based on the wind speed, the rotor speed of the wind turbine, and the rotor radius of the wind turbine, the tip speed ratio is determined. The formula for calculating the tip speed ratio is shown in formula (11).
[0109] A3: Based on the second correspondence and the tip speed ratio, determine the first correspondence between the control parameters and the pitch angle.
[0110] The second correspondence includes three variables: tip speed ratio, control parameters, and pitch angle. Based on the obtained tip speed ratio value and the second correspondence, the first correspondence between the control parameters and the pitch angle is determined.
[0111] For ease of explanation, the principle of determining the first correspondence will be explained below in conjunction with the third and fourth correspondences.
[0112] Figure 11 illustrates the third correspondence. In Figure 11, the horizontal axis of the coordinate system represents the pitch angle, and the vertical axis represents the power coefficient. The two curves represent the correspondence between the power coefficient and the pitch angle when the tip speed ratio (lambda) is 15 and when the tip speed ratio (lambda) is 20, respectively.
[0113] After determining the tip speed ratio, the correspondence between the power coefficient and the pitch angle in the third correspondence can be determined, which is C in Figure 11. p -θ pCurve. Based on the fourth correspondence between control parameters and power coefficient, the first correspondence between pitch angle and control parameters can be determined.
[0114] Under the preset condition that the power coefficient is the optimal power coefficient, the correspondence between the power coefficient and the pitch angle is determined based on the tip speed ratio. Based on this correspondence, the pitch angle value corresponding to the optimal power coefficient is determined. Based on the optimal power coefficient and a fourth correspondence, the values of the control parameters are determined. A first correspondence between the control parameter values and the pitch angle values is established. This allows for a first correspondence applicable to various situations, enabling the adjustment of the wind turbine's pitch angle using this first correspondence.
[0115] As an example, taking shaft power as the control parameter, the first correspondence is described as shown in Figure 12.
[0116] In addition, both wind speed and motor torque are related to shaft power. Wind speed or motor torque can be used as control parameters.
[0117] In some possible implementations, the first correspondence between wind speed and pitch angle can be determined based on the correspondence between shaft power and pitch angle, and the correspondence between wind speed and shaft power.
[0118] For example, the relationship between wind speed V and shaft power P can be expressed by formula (14): P=0.5πρC' p R 2 V 3 (14)
[0119] Among them, C' p It is the power factor of the wind turbine generator set during actual operation.
[0120] In some other possible implementations, the first correspondence between motor torque and pitch angle can be determined based on the correspondence between power coefficient and pitch angle, and the correspondence between motor torque and power coefficient.
[0121] For example, the relationship between shaft power P and motor torque M is shown in formula (15): P=ΩM (15)
[0122] Where Ω represents the impeller speed.
[0123] This allows the pitch angle value to be determined based on wind speed or motor torque, thus enabling adjustment of the pitch angle.
[0124] It should be noted that the first correspondence between control parameters and pitch angle may include multiple sub-correspondences.
[0125] As an example, the sub-correspondence includes the correspondence between the values of control parameters and the values of pitch angle. This allows for relatively precise adjustment of the pitch angle.
[0126] As another example, a sub-correspondence includes the correspondence between a control parameter belonging to a sub-value range and a pitch angle value. That is, a control parameter within a sub-value range corresponds to a pitch angle value.
[0127] As an example, multiple pitch angle values can be set between the initial and final values of the pitch angle during the grid-connected speed control phase. The number of pitch angle values can be, for example, between two and ten. Each pitch angle value corresponds to a control parameter value within a sub-range. This allows for stepped adjustment of the pitch angle, reducing the frequency of pitch angle adjustments, lowering the cost of adjusting the pitch angle while increasing shaft power, and avoiding frequent pitch angle changes.
[0128] S804: Determine the target pitch angle data corresponding to the control parameters based on the control parameters and the first correspondence between the control parameters and the pitch angle.
[0129] The target pitch angle data is used to adjust the pitch angle of the wind turbine generator set.
[0130] S805: Controls the wind turbine generator set based on the target pitch angle data.
[0131] Based on the determined target pitch angle data, the pitch angle of the wind turbine is adjusted so that the current pitch angle value of the wind turbine is the target pitch angle data, or the difference between the current pitch angle value and the target pitch angle data is less than the adjustment threshold.
[0132] The wind turbine generator control method provided in this application can adjust the pitch angle during the grid-connected speed control phase to achieve better power parameters, improve the output power of the wind turbine generator, and thus increase the power generation of the wind turbine generator.
[0133] Figure 13 illustrates the relationship between pitch angle and wind speed. Before adopting the control method for wind turbine generators provided in this application, the pitch angle was not adjusted during the grid-connected speed control phase. After adopting the control method for wind turbine generators provided in this application, the pitch angle is flexibly adjusted. The power change of the wind turbine generator after adjusting the pitch angle is shown in Figure 14. The power of the wind turbine generator after optimizing the pitch angle is higher than that of the wind turbine generator before optimizing the pitch angle.
[0134] Figure 15 illustrates another schematic diagram of the relationship between pitch angle and wind speed. Pitch angle at the initial moment of the grid-connected speed control phase. The pitch angle greater than the end time of the grid-connected speed control phase. The slope of the pitch angle as a function of wind speed is... The value of K is greater than 0.25.
[0135] In another specific embodiment, see Figure 17, which shows a schematic diagram of yet another relationship between pitch angle and wind speed.
[0136] As an example, as shown in Figure 17, by executing the above control method, in the grid-connected speed control phase, the initial pitch angle of this control phase is θ1, and the corresponding cut-in wind speed is V1, and the final pitch angle of this control phase is θ. N The corresponding cut-in wind speed is V. N The wind speed is measured in m / s, and the pitch angle is measured in degrees. N represents the number of pitch angle values set between the initial and final times, which can be between 2 and 10. N pitch angles can be selected for control between the initial and final times, where the value of the i-th pitch angle ranges from [θ1, θ2]. N That is, in θ1 and θ N Between, 1≤i≤N.
[0137] In this example, during the grid-connected speed control phase, the slope of the relationship between pitch angle and wind speed can be calculated using formula (16):
[0138] In one specific implementation, k wind The value range can be [-3, -0.25]. It can be understood that the upper and lower limits of this value range are permissible values within the allowable range for each component of the wind turbine when implementing the control method of this application. In another specific embodiment, k wind The value range can be [-2.4, -0.4]. Compared to the aforementioned value range [-3, -0.25], the value range here is the preferred implementation scheme, which can achieve a more optimized effect. It can improve the utilization of wind energy, increase power generation, and maintain the stable performance of wind turbines.
[0139] Figure 17 illustrates the relationship between pitch angle and wind speed under three different conditions, represented by triangles, circles, and squares. N = 4, meaning four points were selected between the initial and final times for pitch angle control. According to Figure 17, the lines containing the triangle and circle points indicate the upper and lower limits of the slope. The slope k corresponds to the curve containing the square point. wind= -1.6, which is within the range of values mentioned above.
[0140] In addition to using the slope method, the relationship between pitch angle and wind speed can also be calculated in other ways. For example, θ1-θ can be calculated. N With V N The ratio -V1 represents the relationship between the pitch angle and the wind speed. In this case, the value of this ratio can be in the range of [0.25, 3].
[0141] In another example, Figure 18 illustrates a schematic diagram of the correspondence between pitch angle and power. Similar to Figure 17, by executing the above control method, during the grid-connected speed control phase, the initial pitch angle of this control phase is θ1, with a corresponding cut-in wind speed of V1, and the final pitch angle of this control phase is θ. N The corresponding cut-in wind speed is V. N The corresponding wind turbine output power is E N The unit for pitch angle is deg, and the unit for power is MW. N is the number of pitch angle values set between the initial and final times, which can be between 2 and 10. N pitch angles can be selected for control between the initial and final times, where the value of the i-th pitch angle is in the range [θ1, θ2]. N That is, in θ1 and θ N Between, 1≤i≤N.
[0142] With the generator's rated power as E R Based on this, normalizing the output power, we can obtain the following equation (17):
[0143] Substituting formula (17) into formula (16), the slope of the relationship between pitch angle and power can be calculated using formula (18):
[0144] In one specific implementation, k Pow The value range can be [-50, -5]. It can be understood that the upper and lower limits of this value range are permissible values within the allowable range for each component of the wind turbine when implementing the control method of this application. In another specific embodiment, k Pow The value range can be [-45, -7.5]. Compared to the aforementioned value range [-50, -5], the value range here is the preferred embodiment, which can achieve a more optimized effect. It can improve the utilization of wind energy, increase power generation, and maintain the stable performance of wind turbines.
[0145] Figure 18 illustrates the relationship between pitch angle and power under three different conditions, represented by triangles, circles, and squares. N = 4, meaning four points were selected between the initial and final times for pitch angle control. According to Figure 18, the lines containing the square and triangle points indicate the upper and lower limits of the aforementioned slope. The slope of the curve corresponding to the circle point falls within the aforementioned range.
[0146] In addition to using the slope method, the relationship between pitch angle and power can also be calculated in other ways. For example, θ1-θ can be calculated. N and The ratio is used to represent the relationship between pitch angle and power. In this case, the value of this ratio can be in the range of [5, 50].
[0147] This improves the power generation of wind turbines at low wind speeds during the grid connection speed control phase. Low wind speed refers to wind speeds below the rated wind speed. Furthermore, the wind turbine control method provided in this application does not require modification or upgrading of the wind turbine hardware, enabling low-cost adjustment of the blade pitch angle and accelerating the grid connection speed of the wind turbine.
[0148] Based on the control method for a wind turbine generator set provided in the above-described embodiments, this application also provides a control device for a wind turbine generator set. The control device for the wind turbine generator set will be described below with reference to the accompanying drawings.
[0149] Referring to Figure 16, which is a schematic diagram of the structure of a control device for a wind turbine generator provided in an embodiment of this application, it includes:
[0150] The first acquisition module 1601 is used to acquire the operating parameters of the wind turbine generator set, including the rotor speed and the motor torque.
[0151] The second acquisition module 1602 is used to acquire control parameters when it is determined that the operating parameters meet the control conditions, wherein the control conditions are used to determine that the wind turbine generator set is in the grid-connected speed control stage.
[0152] The third acquisition module 1603 is used to acquire the first correspondence between control parameters and pitch angle;
[0153] The determining module 1604 is used to determine the target pitch angle data corresponding to the control parameters based on the control parameters and the first correspondence between the control parameters and the pitch angle;
[0154] The control module 1605 is used to control the wind turbine generator set according to the target pitch angle data.
[0155] The third acquisition module 1603 acquires the second correspondence between the tip speed ratio, control parameters, and pitch angle; acquires the value of the tip speed ratio; and determines the first correspondence between the control parameters and the pitch angle based on the second correspondence and the value of the tip speed ratio.
[0156] The third acquisition module 1603 determines a third correspondence between the tip speed ratio, the power coefficient of the wind turbine generator set, and the pitch angle; determines a fourth correspondence between the power coefficient of the wind turbine generator set and the control parameters; and determines a second correspondence between the tip speed ratio, the control parameters, and the pitch angle based on the third and fourth correspondences.
[0157] When the power coefficient of the wind turbine generator set meets the predetermined conditions, the third acquisition module 1603 determines the second correspondence between the tip speed ratio, control parameters and pitch angle according to the third correspondence and the fourth correspondence.
[0158] The predetermined condition is that the power coefficient of the wind turbine generator set is greater than or equal to the power coefficient threshold.
[0159] The third acquisition module 1603 acquires the wind speed, the rotor speed of the wind turbine generator set, and the rotor radius of the wind turbine generator set; and determines the tip speed ratio based on the rotor speed, the wind speed, and the rotor radius.
[0160] The first correspondence between the control parameters and the pitch angle includes multiple sub-correspondences, each sub-corresponding to a control parameter belonging to a sub-value range and a pitch angle value.
[0161] The control conditions are that the difference between the impeller speed and the minimum impeller speed threshold is less than or equal to the difference threshold, and the motor torque is less than the grid-connected control torque threshold.
[0162] The first correspondence between the control parameters and the pitch angle is the first correspondence between shaft power and pitch angle;
[0163] Alternatively, the first correspondence between the control parameters and the pitch angle is the first correspondence between the motor torque and the pitch angle;
[0164] Alternatively, the first correspondence between the control parameters and the pitch angle is the first correspondence between the wind speed and the pitch angle.
[0165] Based on the control method for a wind turbine generator provided in the above-described method embodiments, this application also provides a device, including: a processor, a memory, and a system bus;
[0166] The processor and the memory are connected via the system bus;
[0167] The memory is used to store one or more programs, the one or more programs including instructions, which, when executed by the processor, cause the processor to perform the control method of the wind turbine generator set described in any of the above embodiments.
[0168] In one specific embodiment, the above-mentioned equipment is integrated into the controller of the wind turbine generator set.
[0169] Based on the wind turbine generator control method provided in the above embodiments, this application provides a non-transitory computer-readable storage medium storing instructions. When the instructions are executed on a terminal device, the terminal device performs the wind turbine generator control method described in any of the above embodiments.
[0170] Based on the wind turbine generator control method provided in the above embodiments, this application also provides a computer program product. The computer program product may be software or program products containing instructions, capable of running on a computing device or stored on any usable medium. When the computer program product runs on at least one computing device, it causes the at least one computing device to execute the wind turbine generator control method.
[0171] Based on the control method for a wind turbine generator set provided in the above-described method embodiments, this application also provides a wind turbine generator set, which includes a controller for executing the above-described control method for the wind turbine generator set.
[0172] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems or apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and relevant parts can be referred to the method section.
[0173] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.
[0174] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0175] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.
[0176] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A control method for a wind turbine generator set, wherein, The method includes: The operating parameters of the wind turbine generator set are obtained, including rotor speed and motor torque. If the operating parameters are determined to meet the control conditions, the control parameters are obtained. The control conditions are used to determine that the wind turbine generator set is in the grid-connected speed control stage. Obtain the first correspondence between control parameters and propeller pitch angle; Based on the control parameters and the first correspondence between the control parameters and the pitch angle, determine the target pitch angle data corresponding to the control parameters; and The wind turbine generator set is controlled based on the target pitch angle data.
2. The method according to claim 1, wherein, The acquisition of the first correspondence between the control parameters and the pitch angle includes: Obtain the second correspondence between tip speed ratio, control parameters, and pitch angle; Obtain the numerical value of the tip speed ratio; and Based on the second correspondence and the value of the tip speed ratio, the first correspondence between the control parameters and the pitch angle is determined.
3. The method according to claim 2, wherein, The acquisition of the second correspondence between the tip speed ratio, control parameters, and propeller pitch angle includes: Determine the third correspondence between tip speed ratio, power coefficient of wind turbine generator set, and pitch angle; Determine the fourth correspondence between the power coefficient and control parameters of the wind turbine generator set; and Based on the third and fourth correspondences, the second correspondence between the tip speed ratio, control parameters, and pitch angle is determined.
4. The method according to claim 3, wherein, The step of determining the second correspondence between the tip speed ratio, control parameters, and pitch angle based on the third and fourth correspondences includes: When the power coefficient of the wind turbine meets the predetermined conditions, the second correspondence between the tip speed ratio, control parameters and pitch angle is determined according to the third correspondence and the fourth correspondence.
5. The method according to claim 4, wherein, The predetermined condition is that the power coefficient of the wind turbine generator set is greater than or equal to the power coefficient threshold.
6. The method according to claim 2, wherein, The process of obtaining the tip speed ratio includes: Obtain wind speed, rotor speed of the wind turbine generator set, and rotor radius of the wind turbine generator set; and The tip speed ratio is determined based on the impeller rotation speed, the wind speed, and the impeller radius.
7. The method according to claim 1, wherein, The first correspondence between control parameters and pitch angle includes multiple sub-correspondences, wherein each sub-correspondence includes the correspondence between a control parameter belonging to a sub-value range and a pitch angle value.
8. The method according to any one of claims 1-7, wherein, The control conditions are that the difference between the impeller speed and the minimum impeller speed threshold is less than or equal to the difference threshold, and the motor torque is less than the grid-connected control torque threshold.
9. The method according to any one of claims 1-7, wherein, The first correspondence between the control parameters and the pitch angle is the first correspondence between shaft power and pitch angle; Alternatively, the first correspondence between the control parameters and the pitch angle is the first correspondence between the motor torque and the pitch angle; Alternatively, the first correspondence between the control parameters and the pitch angle is the first correspondence between the wind speed and the pitch angle.
10. The method according to claim 1, wherein, The target pitch angle data includes a first pitch angle value at the start time of the grid-connected speed control phase and a second pitch angle value at the end time of the grid-connected speed control phase. The control method further includes: Obtain the first wind speed at the start time of the grid-connected speed control phase and the second wind speed at the end time of the grid-connected speed control phase; Wherein, the first wind speed, the second wind speed, the first pitch angle value, and the second pitch angle value satisfy: The ratio between the first difference between the second pitch angle value and the first pitch angle value and the second difference between the second wind speed and the first wind speed is in the range of [-3, -0.25] or [0.25, 3].
11. The method according to claim 10, wherein, The first wind speed is V1, and the second wind speed is V. N The first pitch angle is θ1, and the second pitch angle is θ N And V1, V N θ1 and θ N satisfy: Among them, V1 and V N The units are m / s, θ1 and θ N The unit is deg.
12. The method according to claim 1, wherein, The target pitch angle data includes a first pitch angle value at the start time of the grid-connected speed control phase and a second pitch angle value at the end time of the grid-connected speed control phase. The control method further includes: Obtain a first ratio between the wind turbine generator output power at the end of the grid-connected speed control phase and the wind turbine generator rated power. Wherein, the first ratio, the first pitch angle value, and the second pitch angle value satisfy: The first difference between the second pitch angle value and the first pitch angle value, and the ratio between the first ratio, is in the range of [-50, -5] or [5, 50].
13. The method according to claim 12, wherein, The output power is E N The rated power is E R The first ratio is: The first pitch angle is θ1, and the second pitch angle is θ N ,and θ1 and θ N satisfy: Where θ1 and θ N The unit is deg, E N and E R The unit is MW.
14. An electronic device, comprising: One or more processors; Storage device, on which one or more programs are stored, When the one or more programs are executed by the one or more processors, the one or more processors implement the control method for a wind turbine generator as described in any one of claims 1-13.
15. The electronic device of claim 14, wherein, The electronic equipment is integrated into the controller of the wind turbine generator set.
16. A computer program product, wherein, When the computer program product is run on the device, it causes the device to perform the control method of the wind turbine generator set according to any one of claims 1-13.
17. A wind turbine generator set, wherein, The wind turbine generator set includes a controller for performing the control method of the wind turbine generator set as described in any one of claims 1 to 13.