A wind turbine active power control method and device considering electromagnetic torque smoothing and a storage medium

Abstract

The application discloses a wind turbine active power control method and device considering electromagnetic torque smoothing and a storage medium, and belongs to the technical field of fan control. e , power instruction P cmd and rated speed ω N ; the reference speed ω ref required to be tracked by the fan in the active variable speed operation mode is calculated based on the electromagnetic power output P e ; the electromagnetic torque T e1 required for realizing that the actual wind wheel speed ω tracks the reference speed ω ref in the active variable speed operation mode, and the theoretical electromagnetic torque T e2 corresponding to the fan electromagnetic power output P e responding to the power instruction P cmd are calculated; and the electromagnetic torque instruction T e_ref is calculated based on the electromagnetic torque T e1 and the theoretical electromagnetic torque T e2 . The application superimposes the theoretical electromagnetic torque corresponding to the power instruction, smoothes the electromagnetic torque instruction of the fan, further reduces the corresponding deviation of the fan, and avoids frequent adjustment of the electromagnetic torque instruction and continuous fluctuation of the output power.

Description

Technical Field

[0001] This invention relates to a method, device, and storage medium for controlling the active power of a wind turbine generator that takes into account electromagnetic torque smoothing, belonging to the field of wind turbine control technology. Background Technology

[0002] Traditional wind turbines typically operate in maximum power point tracking (MPPT) mode to capture as much wind energy as possible and maximize turbine output. However, with the high proportion and penetration of wind power into the grid, the randomness and volatility of wind power output pose significant challenges to the safe and stable operation of the grid. Therefore, grid dispatching departments urgently need wind power to participate in automatic grid generation control, that is, to adjust the active power output of wind farms according to grid dispatching instructions. Specifically, the wind farm layer issues power commands to individual wind turbines based on dispatching instructions and the operating status of each turbine. Upon receiving the power commands, the turbine layer adjusts its speed or pitch angle to ensure the actual output tracks the power command. The operating objective of wind turbines has shifted from the traditional maximum power output to power command response.

[0003] Existing wind turbines operating under active variable speed mode primarily rely on electromagnetic torque regulation to achieve rotor speed tracking of a reference speed, while pitch angle adjustment is used to limit power or speed. To reduce the amount of pitch control required, existing research has proposed a priority speed control (RSC) method. When wind speed changes, electromagnetic torque regulation is used first to control the turbine speed, keeping it in an overspeed state. Once the speed reaches the rated speed, pitch control to limit speed is initiated. Therefore, the electromagnetic torque regulation of the turbine needs to respond to the grid power command while simultaneously achieving rotor speed tracking. Due to the slow dynamic characteristics of the large moment of inertia of the rotor, the actual speed cannot quickly and accurately track the reference speed. Frequent adjustments of the electromagnetic torque command to track the reference speed significantly impact the load on the drivetrain and cause the actual power output of the turbine to fluctuate around the power command, resulting in a large power response deviation. Summary of the Invention

[0004] The purpose of this invention is to provide a method, device, and storage medium for controlling the active power of a wind turbine that takes into account electromagnetic torque smoothing, which can reduce the power command response deviation and transmission chain load of the wind turbine.

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

[0006] On one hand, the present invention provides a wind turbine active power control method considering electromagnetic torque smoothing, comprising:

[0007] Obtain wind turbine operating parameters, including actual rotor speed ω and electromagnetic power output P. e Power command P cmd and rated speed ω N;

[0008] Based on the electromagnetic power output P e Calculate the reference speed ω that the wind turbine needs to track in active variable speed operation mode. ref ;

[0009] The calculation is used in active variable speed operation mode to achieve the tracking of the actual wind turbine speed ω with the reference speed ω. ref Required electromagnetic torque T e1 And the electromagnetic power output P of the wind turbine e Response power command P cmd The corresponding theoretical electromagnetic torque T e2 ;

[0010] Based on the electromagnetic torque T e1 and theoretical electromagnetic torque T e2 The electromagnetic torque command T is calculated. e_ref .

[0011] This invention superimposes the theoretical electromagnetic torque corresponding to the power command, smoothing the electromagnetic torque command of the fan, further reducing the corresponding deviation of the fan and the fatigue load of the transmission chain; and avoiding frequent adjustments of the electromagnetic torque command and continuous fluctuations in output power.

[0012] Optionally, the active power control method for the wind turbine generator further includes: comparing the actual rotor speed ω with the rated speed ω N Compare, if ω≥ω N If the pitch angle is within the specified range, pitch control with speed limitation will be performed; otherwise, pitch control with speed limitation will not be performed. The pitch angle command required for pitch control with speed limitation can be calculated using existing technology based on the PI control principle.

[0013] Optionally, the relevant parameters of the wind turbine also include air density ρ, impeller radius R, and optimal tip speed ratio λ. opt and maximum wind energy utilization coefficient C Pmax ;

[0014] The reference speed ω that the wind turbine needs to track in the active variable speed operation mode is calculated. ref include:

[0015] Calculate the electromagnetic power output P in maximum power point tracking mode e The corresponding optimal rotational speed ω opt The formula is:

[0016]

[0017] In the formula, K opt The optimal torque gain coefficient is expressed as:

[0018] Electromagnetic power output Pe With power command P cmd The difference is used as the input of the PI controller, and the additional speed Δω required for the wind turbine to achieve power command tracking is calculated by the PI controller.

[0019] According to the optimal rotational speed ω opt The reference speed ω of the fan is calculated from the additional speed Δω. ref The formula is:

[0020] ω ref =ω opt +Δω.

[0021] Optionally, the calculation in the active speed change operation mode enables the actual speed ω to track the reference speed ω. ref Required electromagnetic torque T e1 This includes: comparing the actual wind turbine speed ω with the reference speed ω ref The difference is used as the input to the PI controller, and the electromagnetic torque T is calculated by the PI controller. e1 .

[0022] Optionally, the calculation of the wind turbine electromagnetic power output P e Response power command P cmd The corresponding theoretical electromagnetic torque T e2 The formula is:

[0023]

[0024] Optionally, the electromagnetic torque T is used as the basis for... e1 and theoretical electromagnetic torque T e2 The electromagnetic torque command T is calculated. e_ref The formula is:

[0025] T e_ref =αT e1 +(1-α)T e2 ,

[0026] In the formula, α is the preset smoothing weight coefficient, and 0≤α≤1.

[0027] Secondly, the present invention provides a wind turbine active power control device that considers electromagnetic torque smoothing, comprising:

[0028] The data acquisition module is configured to: acquire wind turbine operating parameters, wherein the wind turbine operating parameters include rotor speed ω, electromagnetic power output P, ​​etc. e Power command P cmd and rated speed ω N ;

[0029] The reference rotational speed calculation module is configured to: calculate the electromagnetic power output P based on the reference rotational speed calculation module.e Calculate the reference speed ω that the wind turbine needs to track in active variable speed operation mode. ref ;

[0030] The electromagnetic torque calculation module is configured to: calculate the actual wind turbine speed ω tracking the reference speed ω in active variable speed operation mode. ref Required electromagnetic torque T e1 And the electromagnetic power output P of the wind turbine e Response power command P cmd The corresponding theoretical electromagnetic torque T e2 ;

[0031] The control parameter determination module is configured to determine the electromagnetic torque T based on the electromagnetic torque T. e1 and theoretical electromagnetic torque T e2 The electromagnetic torque command T is calculated. e_ref .

[0032] Optionally, the active power control device for wind turbines that takes into account electromagnetic torque smoothing also includes:

[0033] The speed-limited pitch control module is configured to: compare the actual rotor speed ω with the rated speed ω N Compare, if ω≥ω N Then, speed-limited pitch control will be implemented.

[0034] Optionally, the reference speed calculation module calculates the reference speed ω that the wind turbine needs to track in the active variable speed operation mode. ref ,include:

[0035] Calculate the electromagnetic power output P in maximum power point tracking mode e The corresponding optimal rotational speed ω opt The formula is:

[0036]

[0037] In the formula, K opt The optimal torque gain coefficient is expressed as: Where ρ represents air density, R represents wind turbine radius, and λ opt C represents the optimal tip speed ratio. Pmax Indicates the maximum wind energy utilization factor;

[0038] Electromagnetic power output P e With power command P cmd The difference is used as the input of the PI controller, and the additional speed Δω required for the wind turbine to achieve power command tracking is calculated by the PI controller.

[0039] According to the optimal rotational speed ω optThe reference speed ω of the fan is calculated from the additional speed Δω. ref The formula is:

[0040] ω ref =ω opt +Δω.

[0041] Thirdly, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the wind turbine active power control method considering electromagnetic torque smoothing as described in the first aspect.

[0042] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0043] 1) By superimposing the theoretical electromagnetic torque corresponding to the power command on the existing electromagnetic torque command given based on the speed deviation, the electromagnetic torque command of the wind turbine is smoothed, the frequent adjustment of the electromagnetic torque command is reduced, and the wind turbine power response deviation and transmission chain fatigue load are effectively reduced.

[0044] 2) By comparing the actual rotor speed with the rated speed, it is determined whether to perform speed-limited pitch control, which tracks the reference speed more accurately and stabilizes the fluctuating output power. Attached Figure Description

[0045] Figure 1 The diagram shown is a schematic representation of the technical concept of this invention.

[0046] Figure 2 The diagram shown is a schematic representation of the calculation principle of electromagnetic torque command in one embodiment of the active power control method for wind turbine generators of the present invention.

[0047] Figure 3 The diagram shown is a schematic representation of the principle for determining the pitch angle command in one embodiment of the active power control method for wind turbines of the present invention.

[0048] Figure 4 The figure shown is a simulation result trajectory diagram of wind speed, rotational speed, power and pitch angle in an application example of the active power control method of wind turbine of the present invention.

[0049] Figure 5 The diagram shows a comparison of the electromagnetic torque obtained by the method of this application and the electromagnetic torque obtained by the RSC method in an application example simulation. Detailed Implementation

[0050] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations thereof. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0051] The term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0052] The technical concept of this invention is as follows: based on the existing electromagnetic torque command given according to the speed deviation, the theoretical electromagnetic torque corresponding to the power command is superimposed. By smoothing the electromagnetic torque command of the fan, the power response deviation of the fan and the load on the transmission chain are further reduced.

[0053] The implementation of this invention can be found by reference. Figure 1 This includes: acquiring wind turbine operating parameters; and calculating the reference speed ω that the wind turbine needs to track in active variable speed operation mode. ref ; Calculate the reference speed ω used to achieve the actual wind turbine speed ω tracking the reference speed ω in active variable speed operation mode. ref Required electromagnetic torque T e1 And the electromagnetic power output P of the wind turbine e Response power command P cmd The corresponding theoretical electromagnetic torque T e2 Based on the electromagnetic torque T e1 and theoretical electromagnetic torque T e2 The electromagnetic torque command T is calculated. e_ref .

[0054] After receiving the instruction, the actual wind turbine speed ω is compared with the rated speed ω. N Compare, if ω < ω N Then set the pitch angle command to 0 and do not activate the speed-limited pitch control, if ω≥ω N Then, the pitch angle command is calculated, and pitch control with speed limit is performed.

[0055] Example 1

[0056] This embodiment introduces a wind turbine power control method for smoothing electromagnetic torque commands, referencing... Figure 2 As shown, the method includes:

[0057] Given electromagnetic torque command:

[0058] Obtain wind turbine operating parameters, wherein the wind turbine operating parameters include the actual rotor speed ω and power command P.cmd Calculate the electromagnetic power output P of the wind turbine. e Response power command P cmd The corresponding theoretical electromagnetic torque T e2 The formula is:

[0059]

[0060] The wind turbine operating parameters also include air density ρ, impeller radius R, and optimal tip speed ratio λ. opt and maximum wind energy utilization coefficient C Pmax Calculate the electromagnetic power output P in maximum power point tracking mode. e The corresponding optimal rotational speed ω opt The formula is:

[0061]

[0062] In the formula, K opt The optimal torque gain coefficient is expressed as:

[0063] The operating parameters of the wind turbine also include electromagnetic power output P. e Output P with electromagnetic power e With power command P cmd The difference is used as the input of the PI controller, and the additional speed Δω required for the wind turbine to achieve power command tracking is calculated by the PI controller.

[0064] According to the optimal rotational speed ω opt The reference speed ω of the fan is calculated from the additional speed Δω. ref The formula is:

[0065] ω ref =ω opt +Δω;

[0066] Compare the actual wind turbine speed ω with the reference speed ω ref The difference is used as the input to the PI controller, and the electromagnetic torque T is calculated by the PI controller. e1 .

[0067] The electromagnetic torque T e1 and theoretical electromagnetic torque T e2 The electromagnetic torque command T is calculated. e_ref The formula is:

[0068] T e_ref =αT e1 +(1-α)T e2

[0069] In the formula, α is a preset smoothing weight coefficient, and 0≤α≤1, which is selected based on experience in practical applications.

[0070] Give pitch angle command:

[0071] The operating parameters of the fan also include the rated speed ω. N The actual wind turbine speed ω is compared with the rated speed ω. N Compare, if ω < ω N If the speed-limiting pitch is not activated, and ω≥ω is satisfied, then the speed-limiting pitch will not be activated. N Then, speed-limited pitch control will be implemented.

[0072] Example 2

[0073] Based on the same inventive concept as Embodiment 1, this embodiment introduces a wind turbine active power control device that considers electromagnetic torque smoothing, comprising:

[0074] The data acquisition module is configured to: acquire wind turbine operating parameters, wherein the wind turbine operating parameters include rotor speed ω, electromagnetic power output P, ​​etc. e Power command P cmd and rated speed ω N ;

[0075] The reference rotational speed calculation module is configured to: calculate the electromagnetic power output P based on the reference rotational speed calculation module. e Calculate the reference speed ω that the wind turbine needs to track in active variable speed operation mode. ref ;

[0076] The electromagnetic torque calculation module is configured to: calculate the actual wind turbine speed ω tracking the reference speed ω in active variable speed operation mode. ref Required electromagnetic torque T e1 And the electromagnetic power output P of the wind turbine e Response power command P cmd The corresponding theoretical electromagnetic torque T e2 ;

[0077] The control parameter determination module is configured to determine the electromagnetic torque T based on the electromagnetic torque T. e1 and theoretical electromagnetic torque T e2 The electromagnetic torque command T is calculated. e_ref .

[0078] The specific functional implementation of each of the above modules is described in the relevant content of the method in Embodiment 1, and will not be repeated here. It should be noted that:

[0079] The active power control device for the wind turbine also includes a speed-limiting pitch control module, configured to: compare the actual rotor speed ω with the rated speed ω N Compare, if ω < ωN If the speed-limiting pitch is not activated, and ω≥ω is satisfied, then the speed-limiting pitch will not be activated. N Then, speed-limited pitch control will be implemented.

[0080] The pitch angle command required for speed-limited pitch control can be calculated using existing technology based on the PI control principle.

[0081] The reference speed calculation module calculates the reference speed ω that the fan needs to track in the active variable speed operation mode. ref ,include:

[0082] Calculate the electromagnetic power output P in maximum power point tracking mode e The corresponding optimal rotational speed ω opt The formula is:

[0083]

[0084] In the formula, K opt The optimal torque gain coefficient is expressed as: Where ρ represents air density, R represents wind turbine radius, and λ opt C represents the optimal tip speed ratio. Pmax Indicates the maximum wind energy utilization factor;

[0085] Electromagnetic power output P e With power command P cmd The difference is used as the input of the PI controller, and the additional speed Δω required for the wind turbine to achieve power command tracking is calculated by the PI controller.

[0086] According to the optimal rotational speed ω opt The reference speed ω of the fan is calculated from the additional speed Δω. ref The formula is:

[0087] ω ref =ω opt +Δω.

[0088] Example 3

[0089] Based on the same inventive concept as other embodiments, this embodiment describes a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the wind turbine power control method for smoothing electromagnetic torque commands as described in Embodiment 1.

[0090] In conjunction with the above embodiments, the present invention, based on the existing electromagnetic torque command given according to the speed deviation, superimposes the theoretical electromagnetic torque corresponding to the power command, thereby smoothing the electromagnetic torque command of the fan and reducing the power command response deviation of the fan and the load on the transmission chain.

[0091] Figure 4 and Figure 5 This paper presents an application example demonstrating the reduction in power command response deviation after employing the active power control method of this invention in a wind turbine. This application example utilizes the open-source professional wind turbine simulation software FAST (Fatigue, Aerodynamics, Structures, and Turbulence) provided by the National Renewable Energy Laboratory (NREL) to simulate and verify the effect. The wind turbine model used is a 600kW CART 3 blade test model, and the specific parameters are shown in Table 1 below.

[0092] Table 1. Main parameters of the 600kW CART 3 blade testing machine

[0093]

[0094] A 600-second turbulent wind speed sequence (average wind speed 9 m / s, turbulence intensity C) was selected, and the power command was set to 160 kW. Simulations were performed on both the existing method and the method proposed in this invention. The trajectory diagrams of wind speed, rotational speed, power, and propeller pitch angle for the existing method and the method proposed in this invention are shown below. Figure 4 As shown in the diagram, a comparison of the electromagnetic torque of the existing method and the method proposed in this invention is illustrated. Figure 5 As shown. To more intuitively compare the power response deviation and drive train load of the existing method and the method proposed in this invention, the power response deviation P of the existing method and the method proposed in this invention are calculated respectively. RMS and electromagnetic torque standard deviation The specific calculations are as follows:

[0095]

[0096]

[0097] In the formula, n represents the number of samples within the statistical time period. In this invention, the statistical time period is 600s, and the sampling period is 0.04s, therefore n = 15000, P ei T represents the electromagnetic power output of the fan during the i-th sampling. ei Let be the electromagnetic torque of the fan during the i-th sampling. This represents the average electromagnetic torque over the statistical time period.

[0098] The control performance indicators of existing methods and the method proposed in this invention are shown in Table 2.

[0099] Table 2 Control Performance Indicators

[0100]

[0101] From Table 2 and Figure 4 It can be seen that the power command response deviation of the method proposed in this invention is significantly lower than that of existing methods. The method proposed in this invention improves upon existing methods by refining the electromagnetic torque command setting, effectively reducing power output fluctuations caused by frequent fluctuations in the electromagnetic torque command, and improving power command response performance. Furthermore, from Table 2 and... Figure 5 It can be seen that the electromagnetic torque of the method proposed in this invention is more gradual than that of existing methods, which further reduces the fatigue load on the wind turbine drive train and extends the service life of the wind turbine.

[0102] The simulation results above demonstrate that the active power control method for wind turbines that considers electromagnetic torque smoothing proposed in this invention can effectively reduce the power response deviation of the wind turbine and the fatigue load of the transmission chain, thus verifying the effectiveness and practicality of the improved method proposed in this invention.

[0103] In summary, the present invention solves the problems of frequent adjustment of electromagnetic torque command and continuous fluctuation of output power in existing methods. By superimposing the theoretical electromagnetic torque corresponding to the power command on the existing electromagnetic torque command given according to the speed deviation, the power response deviation of the fan and the fatigue load of the transmission chain are effectively reduced, thus extending the service life of the fan.

[0104] 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.

[0105] 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 1 A device that provides the functions specified in one or more boxes.

[0106] 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.

[0107] 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.

[0108] 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 method of active power control for a wind turbine generator, the method comprising: comprising: acquiring a wind turbine operating parameter, wherein the wind turbine operating parameter comprises an actual wind wheel rotating speed , an electromagnetic power output , a power instruction , a rated rotating speed , an air density , a wind wheel radius , an optimal tip speed ratio and a maximum wind energy utilization coefficient ; based on the electromagnetic power output calculating a reference rotational speed to be tracked by the fan in the active variable speed operating mode ; calculating a reference rotational speed tracking the reference rotational speed a required electromagnetic torque and a fan electromagnetic power output a response power instruction a corresponding theoretical electromagnetic torque ; based on the electromagnetic torque and the theoretical electromagnetic torque , the electromagnetic torque instruction is calculated The reference rotating speed of the fan to be tracked in the active variable speed operation mode is calculated according to the following formula: comprising: Computing electromagnetic power output under maximum power point tracking mode corresponding optimal rotation speed , the formula is: ， In the formula, is the optimal torque gain coefficient, expressed as: ; The electromagnetic power output The difference between the power instruction The difference between the power instruction The difference between the power instruction According to the optimal rotational speed and the additional rotational speed The reference rotational speed of the fan is calculated , the formula is: 。 2. The wind turbine active power control method of claim 1, wherein, further comprising: The actual wind wheel rotational speed is compared with the rated rotational speed If the condition ≥ is satisfied, the rotational speed limiting and pitch control is performed.

3. The wind turbine active power control method of claim 1, wherein, The actual rotating speed is calculated in the active shift operation mode The reference rotating speed is tracked The required electromagnetic torque The difference between the actual wind turbine rotating speed and the reference rotating speed is taken as the input of a PI controller, and the electromagnetic torque is calculated through PI control.

4. The wind turbine active power control method of claim 1, wherein, The calculated electromagnetic power output of the fan Response power instruction The corresponding theoretical electromagnetic torque The formula is: 。 5. The wind turbine active power control method of claim 1, wherein, The electromagnetic torque is calculated based on the electromagnetic torque and the theoretical electromagnetic torque , and the electromagnetic torque instruction is calculated , and the formula is: ， In the formula, is a preset smoothing weight coefficient, and .

6. A wind turbine active power control device using the wind turbine active power control method according to any one of claims 1 to 5, characterized by, comprising: A data acquisition module configured to acquire a wind turbine operating parameter, wherein the wind turbine operating parameter comprises a wind rotor rotational speed , an electromagnetic power output , a power instruction , and a rated rotational speed ; The reference speed calculation module is configured to calculate a reference speed of the fan to be tracked based on the electromagnetic power output in the active variable speed operation mode ; an electromagnetic torque calculation module configured to calculate a required electromagnetic torque for achieving a reference rotational speed of the wind turbine and a fan electromagnetic power output in response to a power demand corresponding to a theoretical electromagnetic torque ; The control parameter determination module is configured to determine the parameters based on the electromagnetic torque. and theoretical electromagnetic torque The electromagnetic torque command is calculated. .

7. The wind turbine active power control device of claim 6, wherein, further comprising: A limited speed variable pitch control module is configured to compare an actual wind rotor speed to a rated speed and if ≥ then perform limited speed variable pitch control.

8. The wind turbine active power control apparatus of claim 6, wherein, The reference rotating speed calculation module calculates the reference rotating speed required by the fan to track in the active variable speed operation mode , comprising: Computing electromagnetic power output under maximum power point tracking mode corresponding optimal rotation speed , the formula is: ， wherein is the optimal torque gain coefficient, expressed as: wherein denotes the air density, denotes the rotor radius, denotes the optimal tip speed ratio, denotes the maximum wind energy utilization coefficient; The electromagnetic power output The difference between the power command and the actual power output is taken as the input of a PI controller, and the additional rotational speed required to achieve the power command tracking the wind turbine is calculated by the PI control ; According to the optimal rotation speed and the additional rotation speed The reference rotation speed of the fan is calculated , the formula is: 。 9. A computer-readable storage medium, characterized in that, a computer program stored thereon, which, when executed by a processor, implements the steps of the wind turbine active power control method of any one of claims 1-5.

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