Wind turbine maximum wind energy capture control method, device and system

Abstract

The application provides a wind turbine maximum wind energy capturing control method, device and system, the method comprising: obtaining a generator speed and a low-speed shaft torsion angle; calculating optimal torque of the generator at different speeds according to the generator speed and an optimal wind energy proportionality coefficient; calculating an impeller aerodynamic torque according to the low-speed shaft torsion angle, a low-speed shaft torsion stiffness and a torsion damping coefficient; correcting the optimal torque to obtain a target electromagnetic torque according to the impeller aerodynamic torque; and controlling the generator to operate according to the target electromagnetic torque. In the application, the wind turbine realizes optimal adjustment of the electromagnetic torque in a low wind speed area, can effectively improve energy absorption efficiency when the wind turbine operates below the rated wind speed, improve control performance of the wind turbine, and further improve annual power generation of the wind turbine.

Description

Technical Field

[0001] This invention relates to the field of wind turbine generator control technology, and more specifically, to a method, device, and system for controlling the maximum wind energy capture of a wind turbine generator. Background Technology

[0002] Currently, when wind turbine blades are blown by the wind, their unique aerodynamic shape generates lift, which in turn produces rotational torque to drive the generator and produce electricity. When the wind speed is below the rated wind speed, the wind turbine mainly operates in an underpower state, and the blade pitch angle is adjusted to a fixed pitch angle position. Higher energy utilization is achieved by adjusting the electromagnetic torque. In this case, the wind turbine is mainly controlled based on the static speed-torque curve. However, this static speed-torque curve considers steady-state wind blowing from the front of the rotor, while the actual wind is three-dimensional turbulent wind, and the wind direction and speed are constantly changing.

[0003] Due to the influence of actual wind speed, wind direction, and blade type, wind turbines are in a non-optimal energy absorption state, which leads to a reduction in wind energy utilization and has an adverse effect on turbine performance and power generation. Summary of the Invention

[0004] The problem solved by this invention is the poor wind energy utilization rate of existing wind turbines at low wind speeds.

[0005] To address the aforementioned problems, this invention provides a method for controlling the maximum wind energy capture of a wind turbine generator set, comprising: acquiring the generator speed and the low-speed shaft torsion angle; calculating the optimal torque of the generator at different speeds based on the generator speed and the optimal wind energy ratio coefficient; calculating the impeller aerodynamic torque based on the low-speed shaft torsion angle, the low-speed shaft torsional stiffness, and the torsional damping coefficient; correcting the optimal torque based on the impeller aerodynamic torque to obtain a target electromagnetic torque; and controlling the generator operation based on the target electromagnetic torque.

[0006] Optionally, the formula for calculating the optimal torque at different speeds is as follows:

[0007]

[0008] Among them, Q d For the optimal torque, K opt ω is the optimal wind energy proportion coefficient. g This represents the generator speed.

[0009] Optionally, the formula for calculating the optimal wind energy proportion coefficient is as follows:

[0010]

[0011] Where ρ is the air density, R is the impeller radius, and Cpmax λ is the optimal wind energy utilization coefficient corresponding to the blade airfoil. max Let G be the optimal tip speed ratio, and G be the gearbox transmission ratio. The formula for calculating the tip speed ratio λ is as follows:

[0012] λ=ωR / ν

[0013] Where ω is the impeller speed and ν is the wind speed.

[0014] Optionally, the formula for calculating the aerodynamic torque of the impeller is as follows:

[0015] T a =J r ω′+K s θ+B s θ'+μ

[0016] Among them, T a J is the impeller aerodynamic torque. r Let K be the moment of inertia of the low-speed shaft, ω′ be the rate of change of impeller speed, and K be the speed of rotation. s Let B be the torsional stiffness of the low-speed shaft, θ be the torsional angle of the low-speed shaft, and θ′ be the rate of change of the torsional angle of the low-speed shaft. s Here, μ is the low-speed shaft damping coefficient, and J is the correction factor; the value range of μ is J. r ω′+K s θ+B s 0.1-0.2 times the sum of θ'.

[0017] Optionally, the formula for calculating the target electromagnetic torque is as follows:

[0018] Q t =Q d +g*ΔT a

[0019] Among them, Q t For the target electromagnetic torque, Q d For the optimal torque, g is a correction coefficient constant, ΔT a The aerodynamic torque T at time k a (k) and the aerodynamic torque T at time k-1 a The difference of (k-1).

[0020] Optionally, obtaining the generator speed and low-speed shaft torsion angle includes: obtaining the generator speed measured by a photoelectric encoder.

[0021] Optionally, obtaining the low-speed shaft torsion angle includes: obtaining the low-speed shaft torsion angle measured by the low-speed shaft torsion angle sensor.

[0022] This invention provides a maximum wind energy capture control device for a wind turbine generator set, comprising: an acquisition module for acquiring the generator speed and the low-speed shaft torsion angle; an optimal torque calculation module for calculating the optimal torque of the generator at different speeds based on the generator speed and the optimal wind energy ratio coefficient; an aerodynamic torque calculation module for calculating the impeller aerodynamic torque based on the low-speed shaft torsion angle, the low-speed shaft torsional stiffness, and the torsional damping coefficient; an electromagnetic torque calculation module for correcting the optimal torque based on the impeller aerodynamic torque to obtain a target electromagnetic torque; and a control module for controlling the generator operation based on the target electromagnetic torque.

[0023] Optionally, the formula for calculating the target electromagnetic torque is as follows:

[0024] Q t =Q d +g*ΔT a

[0025] Among them, Q t For the target electromagnetic torque, Q d For the optimal torque, g is a correction coefficient constant, ΔT a The aerodynamic torque T at time k a (k) and the aerodynamic torque T at time k-1 a The difference of (k-1).

[0026] This invention provides a maximum wind energy capture control system for a wind turbine generator set, comprising an optimal wind energy coefficient torque subsystem, a rotor aerodynamic torque output subsystem, and an optimal electromagnetic torque output subsystem. The optimal wind energy coefficient torque subsystem includes a photoelectric encoder and an optimal torque calculation module. The photoelectric encoder measures the generator speed, and the optimal torque calculation module calculates the optimal torque of the generator at different speeds based on the generator speed and the optimal wind energy ratio coefficient. The rotor aerodynamic torque output subsystem includes a low-speed shaft torsion angle sensor and an aerodynamic torque calculation module. The low-speed shaft torsion angle sensor measures the low-speed shaft torsion angle, and the aerodynamic torque calculation module calculates the rotor aerodynamic torque based on the low-speed shaft torsion angle, low-speed shaft torsional stiffness, and torsional damping coefficient. The optimal electromagnetic torque output subsystem uses the rotor aerodynamic torque to correct the optimal torque to obtain the target electromagnetic torque.

[0027] The present invention provides a control method for energy capture under low wind speeds. The wind turbine generator set achieves optimized adjustment of electromagnetic torque in the low wind speed area, which can effectively improve the energy absorption efficiency when the wind turbine generator set is operating below the rated wind speed, improve the control performance of the wind turbine generator set, and thus increase the annual power generation of the wind turbine generator set. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0029] Figure 1 This is a schematic flowchart of a maximum wind energy capture control method for a wind turbine generator set according to one embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of a wind turbine maximum wind energy capture control system in one embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of a wind turbine generator maximum wind energy capture control device in one embodiment of the present invention. Detailed Implementation

[0032] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0033] This invention provides a maximum wind energy capture control method for wind turbine generator sets, which can achieve better energy utilization of wind turbine generator sets at low wind speeds, optimize wind turbine power generation performance, and increase the power generation of the unit. This overcomes the shortcomings of existing wind turbine generators that cannot achieve optimal wind energy utilization at low wind speeds and are difficult to meet the requirements of unit control performance and power generation quality.

[0034] Figure 1 This is a schematic flowchart of a maximum wind energy capture control method for a wind turbine generator set according to one embodiment of the present invention. The method includes:

[0035] S102, obtain the generator speed and the low-speed shaft torsion angle.

[0036] Optionally, the generator speed measured by the photoelectric encoder and the low-speed shaft torsion angle measured by the low-speed shaft torsion angle sensor are acquired. The generator speed value ω is obtained by measuring and recording the generator speed value using the photoelectric encoder on the generator in the wind turbine generator set. g .

[0037] S104, calculate the optimal torque of the generator at different speeds based on the generator speed and the optimal wind energy ratio coefficient.

[0038] By tracking the optimal tip speed ratio, the wind turbine is ensured to always operate under the optimal wind energy utilization coefficient curve, thus achieving optimal wind energy utilization efficiency. Specifically, after determining the airfoil of the wind turbine blade, the tip speed ratio λ and the optimal proportional coefficient K can be obtained by combining the impeller radius R, impeller speed ω, wind speed v, air density ρ, and gearbox transmission ratio G. opt .

[0039] According to K opt The generator at different speeds ω can be calculated. g The optimal torque Q at that time d .

[0040] S106, calculate the impeller aerodynamic torque based on the low-speed shaft torsion angle, low-speed shaft torsion stiffness and torsional damping coefficient.

[0041] By measuring the torsional angle θ of the low-speed shaft in real time under operating conditions, and combining it with the torsional stiffness K of the low-speed shaft... s and low-speed shaft damping coefficient B s The instantaneous aerodynamic torque T of the impeller can be calculated based on the change in the impeller angular velocity. a The torsion angle θ is the angle between the low-speed shaft and the center line of the hub. The aerodynamic torque refers to the torque generated by the wind blowing the blades. A larger aerodynamic torque results in a larger electromagnetic torque.

[0042] The calculation of impeller aerodynamic torque takes into account information such as wind speed, air density, yaw error, and the vertical incident angle of the wind, which can reflect the actual operating state of the wind turbine and provide a basis for optimizing energy capture of wind turbines in low wind speeds.

[0043] S108, the target electromagnetic torque is obtained by correcting the optimal torque based on the impeller aerodynamic torque.

[0044] When determining the optimal target electromagnetic torque, a correction factor related to the change in impeller aerodynamic torque is introduced. Adjusting this correction factor yields optimal torque compensation. This change in impeller aerodynamic torque is the difference between the aerodynamic torque at the first and second moment. The electromagnetic torque has an optimal operating point, and optimal torque compensation allows the electromagnetic torque to reach this optimal value. The correction factor is determined based on the generator speed and aerodynamic torque, enabling the acquisition of optimal electromagnetic torque and optimization of power generation at low wind speeds.

[0045] S110, control the generator operation according to the above-mentioned target electromagnetic torque.

[0046] Optionally, the impeller speed is controlled by the aforementioned target electromagnetic torque. By controlling the impeller speed through the aforementioned impeller aerodynamic torque measurement and calculation stage and the dynamic optimization energy absorption adjustment stage, the impeller is always in the optimal wind energy absorption state, improving energy absorption efficiency and compensating for the shortcomings of control based on static torque-speed curves. Here, energy absorption efficiency is the ratio of electromagnetic torque to aerodynamic torque.

[0047] The maximum wind energy capture control method for wind turbine generators provided in this invention has designed a control mode for energy capture under low wind speeds. The wind turbine generator achieves optimized adjustment of electromagnetic torque in the low wind speed area, which can effectively improve the energy absorption efficiency when the wind turbine generator is operating below the rated wind speed, improve the control performance of the wind turbine generator, and thus increase the annual power generation of the wind turbine generator.

[0048] Specifically, the aforementioned maximum wind energy capture control method for wind turbine generators proposes a rotor aerodynamic torque measurement and calculation stage and a dynamic optimization energy absorption adjustment stage to control the rotor speed, ensuring the rotor is always in the optimal wind energy absorption state, thus compensating for the shortcomings of control based on static torque-speed curves. This method may include the following steps:

[0049] (1) Obtain the generator speed ω g Optimal wind energy ratio coefficient K opt And calculate the optimal torque Q of the generator at different speeds. d ;

[0050] (2) Obtain the low-speed shaft torsion angle θ and calculate the impeller aerodynamic torque T. a ;

[0051] (3) The optimal electromagnetic torque Q is calculated using the following formula. t =Q d +g*ΔT a In the formula, g is a correction coefficient constant.

[0052] In step (1), the generator speed ω g The torsion angle θ of the low-speed shaft in step (2) can be obtained by measuring with a photoelectric encoder.

[0053] Specifically, after the airfoil of the wind turbine blades is determined, the tip speed ratio and the optimal wind energy ratio can be obtained by combining the impeller radius, impeller speed, wind speed, air density, gearbox transmission ratio, etc. The optimal wind energy ratio K is... opt The calculation formula is as follows:

[0054]

[0055] Where ρ is the air density, R is the impeller radius, and Cpmax λ is the optimal wind energy utilization coefficient corresponding to the blade airfoil. max Let G be the optimal tip speed ratio, and G be the gearbox transmission ratio. The formula for calculating the tip speed ratio λ is as follows:

[0056] λ=ωR / ν

[0057] Where ω is the impeller speed and ν is the wind speed.

[0058] According to K opt Calculate the generator speed ω at different speeds g The optimal torque Q at that time d :

[0059]

[0060] Among them, Q d For the optimal torque, K opt ω is the optimal wind energy proportion coefficient. g This represents the generator speed.

[0061] By measuring the torsional angle θ of the low-speed shaft in real time during operation, and combining the torsional stiffness and torsional damping coefficient of the low-speed shaft, the instantaneous aerodynamic torque of the impeller can be calculated based on the change in the impeller angular velocity.

[0062] T a =J r ω′+K s θ+B s θ'+μ

[0063] Among them, T a J is the impeller aerodynamic torque. r Let K be the moment of inertia of the low-speed shaft, ω′ be the rate of change of impeller speed, and K be the speed of rotation. s Let B be the low-speed shaft stiffness, θ be the low-speed shaft torsional angle, θ′ be the rate of change of the low-speed shaft torsional angle, and B be the low-speed shaft stiffness. s Here, μ is the low-speed shaft damping coefficient, and μ is a correction factor adjusted according to different engine models; the value range of μ is J. r ω′+K s θ+B s 0.1-0.2 times the sum of θ'.

[0064] The target electromagnetic output torque of the wind turbine generator set is:

[0065] Q t =Q d +g*ΔT a

[0066] ΔT a =T a (k)-T a (k-1)

[0067] Among them, Q t For the target electromagnetic torque, Q d For the optimal torque, g is a correction coefficient constant, typically ranging from 0.1 to 0.5, ΔT a The aerodynamic torque T at time k a (k) and the aerodynamic torque T at time k-1 a The difference of (k-1).

[0068] The aforementioned target electromagnetic output torque incorporates a correction factor g*T. a The adjustment is based on the aerodynamic torque to obtain optimal torque compensation. The correction amount is based on the generator speed and aerodynamic torque to obtain the optimal electromagnetic torque, thereby optimizing power generation at low wind speeds.

[0069] This invention provides a maximum wind energy capture control system for wind turbine generators. Figure 2 The schematic diagram of the maximum wind energy capture control system for a wind turbine generator provided in an embodiment of the present invention shows that it includes an optimal wind energy coefficient torque subsystem 201, an impeller aerodynamic torque output subsystem 202, and an optimal electromagnetic torque output subsystem 203.

[0070] The optimal wind energy coefficient torque subsystem 201 includes a photoelectric encoder and an optimal torque calculation module, which are connected sequentially. The photoelectric encoder is used to measure the generator speed, and the optimal torque calculation module is used to calculate the optimal torque of the generator at different speeds based on the generator speed and the optimal wind energy coefficient.

[0071] The impeller aerodynamic torque output subsystem 202 includes a low-speed shaft torsion angle sensor and an aerodynamic torque calculation module, which are connected in sequence. The low-speed shaft torsion angle sensor is used to measure the torsion angle of the low-speed shaft, and the aerodynamic torque calculation module is used to calculate the impeller aerodynamic torque based on the torsion angle, torsion stiffness, and torsion damping coefficient of the low-speed shaft.

[0072] The optimal electromagnetic torque output subsystem 203 is used to obtain the target electromagnetic torque by correcting the optimal torque using the impeller aerodynamic torque.

[0073] The input of the photoelectric encoder measures the generator speed signal, the input of the low-speed shaft torsion angle sensor measures the low-speed shaft torsion angle signal, the optimal torque calculation module outputs the optimal torque signal, the pneumatic torque calculation module outputs the pneumatic torque signal, and the two are superimposed to output the optimal electromagnetic torque signal.

[0074] The optimal wind energy coefficient torque subsystem 201 first measures and records the generator speed ωg by using a photoelectric encoder on the generator in the wind turbine generator set. The optimal torque calculation module tracks the optimal tip speed ratio to ensure that the wind turbine always operates under the optimal wind energy utilization coefficient curve, thereby achieving optimal wind energy utilization efficiency.

[0075] The impeller aerodynamic torque output subsystem 202 first measures the torsion angle of the low-speed shaft using a low-speed shaft torsion angle sensor. Then, the aerodynamic torque calculation module measures the torsion angle of the low-speed shaft in real time during operation. Combined with the torsional stiffness and torsional damping coefficient of the low-speed shaft, the instantaneous aerodynamic torque of the impeller can be calculated based on the change in the impeller angular velocity.

[0076] The optimal electromagnetic torque output subsystem 203 is modified based on the generator speed and aerodynamic torque to obtain the optimal electromagnetic torque, thereby optimizing power generation at low wind speeds.

[0077] The maximum wind energy capture control system for wind turbine generators of this invention can solve the problem of low wind energy utilization rate of wind turbine generators under low wind speeds. By designing and innovating the torque calculation and optimization control links, it can improve the operating performance and technical level of wind turbine generators under low wind speeds, increase the annual power generation of wind turbine generators, and is of great significance to improving the competitiveness of wind turbine generator products in the market.

[0078] Figure 3 This is a schematic diagram of the structure of a wind turbine generator maximum wind energy capture control device provided in an embodiment of the present invention. The device includes:

[0079] The acquisition module 301 is used to acquire the generator speed and the low-speed shaft torsion angle.

[0080] The optimal torque calculation module 302 is used to calculate the optimal torque of the generator at different speeds based on the generator speed and the optimal wind energy ratio coefficient.

[0081] The aerodynamic torque calculation module 303 is used to calculate the impeller aerodynamic torque based on the low-speed shaft torsion angle, low-speed shaft torsion stiffness and torsional damping coefficient.

[0082] The electromagnetic torque calculation module 304 is used to obtain the target electromagnetic torque by correcting the optimal torque based on the impeller aerodynamic torque.

[0083] The control module 305 is used to control the operation of the generator according to the target electromagnetic torque.

[0084] Optionally, the formula for calculating the target electromagnetic torque is as follows:

[0085] Q t =Q d+g*ΔT a

[0086] Among them, Q t For the target electromagnetic torque, Q d For the optimal torque, g is a correction coefficient constant, ΔT a The aerodynamic torque T at time k a (k) and the aerodynamic torque T at time k-1 a The difference of (k-1).

[0087] This invention also provides a computer-readable storage medium storing a computer program. When executed by a processor, the computer program implements the processes described in the above embodiments and achieves the same technical effects. To avoid repetition, these will not be elaborated further here. The computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc.

[0088] Of course, those skilled in the art will understand that all or part of the processes of the above embodiments can be implemented by computer-controlled devices. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the above method embodiments. The storage medium can be a memory, a disk, an optical disk, etc.

[0089] Finally, it should 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.

[0090] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0091] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. 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 the invention. Therefore, the invention 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 method for controlling the maximum wind energy capture of a wind turbine generator set, characterized in that, include: Obtain the generator speed and the low-speed shaft torsion angle; Based on the generator speed and the optimal wind energy ratio coefficient, calculate the optimal torque of the generator at different speeds; Calculate the impeller aerodynamic torque based on the low-speed shaft torsion angle, low-speed shaft torsion stiffness, and torsional damping coefficient. The target electromagnetic torque is obtained by correcting the optimal torque based on the impeller aerodynamic torque; the calculation formula for the target electromagnetic torque is as follows: Q t =Q d +g*ΔT a Among them, Q t For the target electromagnetic torque, Q d For the optimal torque, g is a correction coefficient constant, ΔT a The aerodynamic torque T at time k a (k) and the aerodynamic torque T at time k-1 a The difference of (k-1); The generator is operated according to the target electromagnetic torque.

2. The method according to claim 1, characterized in that, The formulas for calculating the optimal torque at different speeds are as follows: Among them, Q d For the optimal torque, K opt ω is the optimal wind energy proportion coefficient. g This represents the generator speed.

3. The method according to claim 2, characterized in that, The formula for calculating the optimal wind energy ratio is as follows: Where ρ is the air density, R is the impeller radius, and C pmax λ is the optimal wind energy utilization coefficient corresponding to the blade airfoil. max Let G be the optimal tip speed ratio, and G be the gearbox transmission ratio. The formula for calculating the tip speed ratio λ is as follows: λ=ωR / ν Where ω is the impeller speed and ν is the wind speed.

4. The method according to claim 1, characterized in that, The formula for calculating the aerodynamic torque of the impeller is as follows: T a =J r ω′+K s θ+B s θ'+μ Among them, T a J is the impeller aerodynamic torque. r Let K be the moment of inertia of the low-speed shaft, ω′ be the rate of change of impeller speed, and K be the speed of rotation. s Let B be the torsional stiffness of the low-speed shaft, θ be the torsional angle of the low-speed shaft, and θ′ be the rate of change of the torsional angle of the low-speed shaft. s Here, μ is the low-speed shaft damping coefficient, and J is the correction factor; the value range of μ is J. r ω′+K s θ+B s 0.1-0.2 times the sum of θ'.

5. The method according to any one of claims 1-4, characterized in that, The acquisition of generator speed and low-speed shaft torsion angle includes: Obtain the generator speed measured by the photoelectric encoder.

6. The method according to any one of claims 1-4, characterized in that, The acquisition of the low-speed shaft torsion angle includes: Obtain the low-speed shaft torsion angle measured by the low-speed shaft torsion angle sensor.

7. A maximum wind energy capture control device for a wind turbine generator set, characterized in that, include: The acquisition module is used to acquire the generator speed and the low-speed shaft torsion angle; The optimal torque calculation module is used to calculate the optimal torque of the generator at different speeds based on the generator speed and the optimal wind energy ratio coefficient. The aerodynamic torque calculation module is used to calculate the impeller aerodynamic torque based on the low-speed shaft torsion angle, low-speed shaft torsion stiffness, and torsional damping coefficient. An electromagnetic torque calculation module is used to obtain the target electromagnetic torque by correcting the optimal torque based on the impeller aerodynamic torque; the calculation formula for the target electromagnetic torque is as follows: Q t =Q d +g*ΔT a Among them, Q t For the target electromagnetic torque, Q d For the optimal torque, g is a correction coefficient constant, ΔT a The aerodynamic torque T at time k a (k) and the aerodynamic torque T at time k-1 a The difference of (k-1); The control module is used to control the generator operation according to the target electromagnetic torque.

8. A maximum wind energy capture control system for a wind turbine generator set, characterized in that, The wind turbine generator maximum wind energy capture control method according to any one of claims 1-6, wherein the control system includes an optimal wind energy coefficient torque subsystem, an impeller aerodynamic torque output subsystem, and an optimal electromagnetic torque output subsystem; The optimal wind energy coefficient torque subsystem includes a photoelectric encoder and an optimal torque calculation module; the photoelectric encoder is used to measure the generator speed, and the optimal torque calculation module is used to calculate the optimal torque of the generator at different speeds based on the generator speed and the optimal wind energy ratio coefficient. The impeller aerodynamic torque output subsystem includes a low-speed shaft torsion angle sensor and an aerodynamic torque calculation module; the low-speed shaft torsion angle sensor is used to measure the low-speed shaft torsion angle, and the aerodynamic torque calculation module is used to calculate the impeller aerodynamic torque based on the low-speed shaft torsion angle, low-speed shaft torsional stiffness, and torsional damping coefficient. The optimal electromagnetic torque output subsystem is used to correct the optimal torque using the impeller aerodynamic torque to obtain the target electromagnetic torque.

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