A typhoon-resistant soft cut-out control method and system for offshore wind turbines

Abstract

The present invention discloses a typhoon-resistant soft-cutout control method and system for offshore wind turbines. When a typhoon approaches and the measured wind speed exceeds the set cut-in wind speed, a hyperbolic function is used to flexibly control the generator torque and blade pitch angle of the wind turbine, allowing the wind turbine to smoothly reduce its rotational speed and generator power as the wind speed increases, completing a soft cutout. This method not only ensures the structural safety and stability of the wind turbine during a typhoon, but also effectively increases the operating time and power generation of the wind turbine, broadens the wind speed range within which the turbine operates, and overcomes the two major problems of structural hazards and loss of power generation time and power generation caused by hard-cutout shutdown of wind turbines during typhoons.

Description

Technical Field

[0001] The present invention relates to the field of offshore wind power, and in particular to a typhoon-resistant soft cut-out control method and system for an offshore wind turbine generator set. Background Art

[0002] Promoting the development of offshore wind power in coastal waters has become a trend in the wind power industry. However, high construction costs have long been a major constraint. To achieve cost reduction and efficiency improvement, offshore wind turbines are becoming larger. As the capacity of individual turbines increases, the tower height and rotor diameter of offshore wind turbines also increase accordingly. Taller towers and longer blades place greater loads on the turbines, especially in extreme weather conditions like typhoons, which place significant loads on the tower, blades, and nacelle brake systems. Currently, to reduce turbine loads, traditional control methods typically set a cut-out wind speed for strong winds. When the wind speed exceeds the cut-out speed, the turbine will execute a hard cut-out, immediately ceasing power generation to prevent excessive load on the turbine. However, this approach eliminates aerodynamic damping in the fore-aft direction of the turbine, significantly increasing the vibration amplitude of the turbine due to wave loads. During a typhoon, wind speeds can be significantly higher than the cut-out speed. After a hard cut-out, the wind turbine structure faces a significant risk of instability and damage, and the wind resources cannot be effectively utilized for power generation. This limits the wind turbine's power generation potential in high wind conditions and prevents the maximum utilization of renewable energy. Summary of the Invention

[0003] In order to solve the above technical problems and improve the operational stability and power generation efficiency of wind turbines under typhoon conditions, the present invention provides a typhoon-resistant soft cut-out control method and system for offshore wind turbines.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] A first aspect of an embodiment of the present invention provides a typhoon-resistant soft cut-out control method for an offshore wind turbine generator system, comprising the following steps:

[0006] (1) Reading laser wind radar information and electric meter voltage information, filtering the laser wind radar information to obtain the filtered wind speed;

[0007] (2) Determine whether the filtered wind speed exceeds the standard cut-out wind speed. If the filtered wind speed is greater than the standard cut-out wind speed v f,s , then execute step (3), otherwise end the process;

[0008] (3) The generator torque and blade pitch angle are calculated in real time according to the filtered wind speed at the current moment to obtain the generator torque and blade pitch angle data;

[0009] (4) transmitting the generator torque data to the generator controller, which adjusts the torque to the calculated value; transmitting the blade pitch angle data to the variable pitch system, which adjusts the blade pitch angle to the calculated value;

[0010] (5) Determine the relationship between the current wind speed and the full cut-out wind speed and the standard cut-out wind speed. If the current wind speed is less than the full cut-out wind speed but greater than the standard cut-out wind speed, re-execute steps (3) and (4). If the current wind speed is greater than the full cut-out wind speed, stop controlling the wind turbine. At this time, the wind turbine has smoothly reduced the speed and generator power during the process of increasing wind speed, completing soft cut-out. Stop controlling the wind turbine until the current wind speed is reduced to less than the standard cut-out wind speed.

[0011] Furthermore, in step (1), the laser wind radar information is filtered using the following formula to obtain the filtered wind speed;

[0012] v f [i]=(1-α)v[i]+αv f [i-1]

[0013] Where i represents the current time step, v and v f are the wind speed before and after filtering, respectively, and α is the low-pass filter coefficient.

[0014] Furthermore, in step (3), the control expression of the generator torque is:

[0015]

[0016] Where, T g,t is the torque of the generator under typhoon conditions, P r is the rated power of the generator, η is the generator efficiency, N gb is the gearbox speed ratio, Ω f is the rated wind wheel speed;

[0017] Blade pitch angle Δθ t The control expression is:

[0018]

[0019] Where ΔΩ' is the speed error value, K P , K I , K t are the proportional, integral and differential gain coefficients of the PID controller respectively; for typhoon conditions, the speed error value is ΔΩ′(t)=Ω f (t)-Ω ′ r =Ω f(t)-Ω r ·g s , where Ω f (t) is the generator speed after filtering, Ω r is the rated low-speed shaft speed, g s is the calculation coefficient based on the hyperbolic function, the expression is:

[0020]

[0021] Among them, Ω ′ r is the speed value tracked by the pitch controller under typhoon conditions, v s With v c They are standard cut-out wind speed and full cut-out wind speed respectively.

[0022] A second aspect of an embodiment of the present invention provides a typhoon-resistant soft cut-out control system for an offshore wind turbine, comprising:

[0023] The wind speed acquisition and filtering module is used to read the laser wind radar sensor information and the meter voltage information, and filter the laser wind radar information to obtain the filtered wind speed;

[0024] The first decision module is used to determine whether the filtered wind speed exceeds the set cut-out wind speed; if the filtered wind speed is greater than the set cut-out wind speed, the main control calculation module is executed, otherwise the process ends;

[0025] The main control calculation module is used to receive the filtered wind speed data and calculate the optimal generator torque value and blade pitch angle value at the current moment based on the hyperbolic function calculation expression, transmit the calculated data to the generator control module and the pitch control module respectively, and send execution instructions at the same time;

[0026] The generator control module is used to receive the target generator torque value calculated by the main control calculation module and execute the generator torque control instruction to adjust the generator torque to the calculated value;

[0027] The pitch control module is used to receive the target blade pitch angle value calculated by the main control calculation module and execute the blade pitch angle control instruction to adjust the blade pitch angle to the calculated value;

[0028] The second decision module is used to determine whether to continue starting the main control calculation module to ensure the stability of the wind turbine structure and power generation; the second decision module is also used to enable the wind turbine to smoothly reduce the speed and generator power as the wind speed increases to achieve soft cut-out.

[0029] A third aspect of an embodiment of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and used to run on the processor, wherein the processor implements the above-mentioned typhoon-resistant soft cut-out control method for offshore wind turbines when executing the computer program.

[0030] A fourth aspect of an embodiment of the present invention provides a computer-readable storage medium having a specific computer program stored thereon. When the computer program is executed by a processor, the above-mentioned typhoon-resistant soft cut-out control method for offshore wind turbines is implemented.

[0031] Compared with the existing technology, the beneficial effects of the present invention are: the present invention proposes a typhoon-resistant soft cut-out control method and system for offshore wind turbines, which can not only ensure the structural safety and stability of the wind turbine when a typhoon passes, but also effectively improve the operating power generation time and power generation of the wind turbine, broaden the operating power generation wind speed range of the unit, and overcome the two major problems of hidden dangers to the structure and loss of power generation time and power generation caused by the hard cut-out and shutdown operation of the wind turbine under typhoons. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a logic flow chart of the typhoon-resistant soft cut-out control method for offshore wind turbines according to the present invention;

[0033] Figure 2 This is a comparison diagram of the control effects before and after the implementation of the typhoon-resistant soft cut-out control method of the present invention in a certain wind farm;

[0034] Figure 3 Schematic diagram of the structure of the system of the present invention;

[0035] Figure 4 A schematic diagram of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0036] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent like or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0037] The terms used in this invention are for the purpose of describing specific embodiments only and are not intended to limit the invention. The singular forms "a," "the," and "the" used in this invention and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0038] It should be understood that although the terms "first," "second," "third," etc. may be used in the present invention to describe various information, such information should not be limited to these terms. These terms are merely used to distinguish information of the same type from one another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. Depending on the context, the term "if" as used herein may be interpreted as "when," "when," or "in response to determining."

[0039] The present invention will be described in detail below with reference to the accompanying drawings. Unless there is any conflict, the features of the following embodiments and implementations may be combined with each other.

[0040] The present invention is further described below by way of examples, but the present disclosure is not limited to the scope of the examples.

[0041] An embodiment of the present invention provides a typhoon-resistant soft cut-out control method for an offshore wind turbine generator system. Figure 1 As shown, the control method includes the following steps:

[0042] Step 1: Read the laser wind radar information and the meter voltage information, and use the formula v f [i]=(1-α)v[i]+αv f [i-1] Filter the laser wind radar information to obtain the filtered wind speed; where i represents the current time step, v and v f are the wind speed before and after filtering, α is the low-pass filter coefficient, T s is the time step, f c is the turning frequency;

[0043] Step 2: According to the filtered wind speed v f Whether it exceeds the standard cut-out filter wind speed v set by the control system f,s , to determine whether the offshore wind turbine anti-typhoon soft cut-out control system needs to intervene. In actual engineering applications, the standard cut-out wind speed before filtering is usually set to 18m / s-25m / s. f Greater than the standard cut-out wind speed v f,s , then start step 3, otherwise end the process;

[0044] Step 3: The main controller in the control system calculates the generator torque and blade pitch angle in real time based on the filtered wind speed at the current moment. The control expression of the generator torque is:

[0045]

[0046] Among them, T g,t is the torque of the generator under typhoon conditions, P r is the rated power of the generator; η is the generator efficiency; N gb is the gearbox speed ratio, Ω f is the rated wind wheel speed;

[0047] The control expression of the blade pitch angle is:

[0048]

[0049] Among them, ΔΩ' is the speed error value, K P , K I , K t are the proportional, integral and differential gain coefficients of the PID controller respectively; for typhoon conditions, the speed error value is ΔΩ′(t)=Ω f (t)-Ω ′ r =Ω f (t)-Ω r ·g s , where Ω f (t) is the generator speed after filtering, Ω r is the rated low-speed shaft speed, g s is the calculation coefficient based on the hyperbolic function, the expression is:

[0050]

[0051] Among them, Ω ′ r v is the rotational speed value tracked by the pitch controller under typhoon conditions. By tracking this value, the blade pitch angle can be kept at a larger angle in the high wind speed area, thereby reducing the wind load on the wind turbine; s With v c They are the standard cut-out wind speed after filtering and the actual full cut-out wind speed. In actual engineering applications, the full cut-out wind speed before filtering is usually set to 45m / s-50m / s;

[0052] Step 4: The main controller transmits the calculated generator torque data to the generator controller, and the generator controller adjusts the torque to the calculated value; the main controller transmits the calculated blade pitch angle data to the pitch control system, and the pitch control system adjusts the blade pitch angle to the calculated value;

[0053] Step 5: 20 seconds after step 4 is completed, determine whether it is necessary to continue using this control method to control the wind turbine generator set based on the current wind speed. If the current wind speed is less than the full cut-out wind speed but greater than the standard cut-out wind speed, re-execute steps 3 and 4; if the current wind speed is greater than the full cut-out wind speed, the control of the wind turbine generator set will be stopped. At this time, the wind turbine generator set has smoothly reduced the speed and generator power as the wind speed increases, completing the soft cut-out; if the wind speed drops to less than the standard cut-out wind speed, the control of the wind turbine will also be stopped.

[0054] See also Figure 2 , Figure 2 The control effects before and after the implementation of the typhoon-resistant soft cut-out control method of the present invention are compared; it can be seen that based on the above control method, when a typhoon comes and the wind turbine reaches the designed cut-out wind speed, it will not be cut out immediately. Instead, under the premise of ensuring the structural stability and operational safety of the unit, the power generation torque and the blade pitch angle are flexibly changed based on the wind speed, thereby ensuring the operating time and power generation of the wind turbine and avoiding the waste of renewable energy to a certain extent.

[0055] See also Figure 3 An embodiment of the present invention further provides a typhoon-resistant soft cut-out control system for an offshore wind turbine generator set, wherein the wind turbine generator set includes a generator and a tower.

[0056] The control system includes:

[0057] The wind speed acquisition and filtering module is used to read the laser wind radar sensor information and the meter voltage information, and filter the laser wind radar information to obtain the filtered wind speed;

[0058] The first decision module is used to determine whether the offshore wind turbine anti-typhoon soft cut-out control method should be used based on whether the filtered wind speed exceeds the set cut-out wind speed; if the filtered wind speed is greater than the set cut-out wind speed, the main control calculation module is executed; otherwise, the process ends;

[0059] Main control calculation module: used to receive filtered wind speed data, and calculate the optimal generator torque value and blade pitch angle value at the current moment based on the hyperbolic function calculation expression, transmit the calculated data to the generator control module and pitch control module respectively, and send execution instructions at the same time;

[0060] The generator control module is used to receive the target generator torque value calculated by the main control calculation module and execute the generator torque control instruction to adjust the generator torque to the calculated value;

[0061] The pitch control module is used to receive the target blade pitch angle value calculated by the main control calculation module and execute the blade pitch angle control instruction to adjust the blade pitch angle to the calculated value;

[0062] The second decision module is used to determine whether it is necessary to continue to start the main control calculation module to ensure the stability of the wind turbine structure and power generation, or to enable the wind turbine to smoothly reduce the speed and generator power as the wind speed increases to achieve soft cut-out.

[0063] Corresponding to the embodiment of the above-mentioned offshore wind turbine anti-typhoon soft cut-out control method, the embodiment of the present application further provides an electronic device, including: one or more processors; a memory for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the above-mentioned offshore wind turbine anti-typhoon soft cut-out control method. Figure 4 As shown, it is a hardware structure diagram of any device with data processing capability in the typhoon-resistant soft cut-out control method of offshore wind turbines provided by the embodiment of the present application, except Figure 4 In addition to the processor, memory, DMA controller, disk, and non-volatile memory shown, any device with data processing capabilities in which the apparatus in the embodiment is located may also include other hardware, generally based on the actual functions of the device with data processing capabilities, which will not be described in detail.

[0064] Corresponding to the embodiment of the above-mentioned offshore wind turbine anti-typhoon soft cut-out control method, an embodiment of the present invention also provides a computer-readable storage medium on which a program is stored. When the program is executed by a processor, the offshore wind turbine anti-typhoon soft cut-out control method in the above-mentioned embodiment is implemented.

[0065] The computer-readable storage medium may be an internal storage unit of any device with data processing capabilities described in any of the aforementioned embodiments, such as a hard disk or memory. The computer-readable storage medium may also be any device with data processing capabilities, such as a plug-in hard disk, a smart media card (SMC), an SD card, a flash card, etc. equipped on the device. Furthermore, the computer-readable storage medium may also include both an internal storage unit of any device with data processing capabilities and an external storage device. The computer-readable storage medium is used to store the computer program and other programs and data required by any device with data processing capabilities, and may also be used to temporarily store data that has been output or is to be output.

[0066] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the contents disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only.

[0067] Although the present invention has been described in detail above with reference to a general description and specific embodiments, it will be apparent to those skilled in the art that modifications and improvements based on the present invention are possible. Therefore, such modifications and improvements, without departing from the spirit of the present invention, are intended to be within the scope of the present invention.

Claims

1. A typhoon-resistant soft cut-out control method for offshore wind turbines, characterized in that: The steps include: (1) Read the laser wind radar information and the meter voltage information, filter the laser wind radar information, and obtain the filtered wind speed; (2) Determine whether the filtered wind speed exceeds the standard cut-out wind speed. If the filtered wind speed is greater than the standard cut-out wind speed, , then execute step (3), otherwise end the process; (3) Calculate the generator torque and blade pitch angle value in real time based on the filtered wind speed at the current moment to obtain the generator torque and blade pitch angle data; The control expression of the generator torque is: ； Where, is the torque of the generator under typhoon conditions, is the rated power of the generator, is the generator efficiency, is the gearbox speed ratio, is the rated wind wheel speed; Blade pitch angle The control expression is: ； Where, is the speed error value, are the proportional, integral and differential gain coefficients of the PID controller respectively; for typhoon conditions, the speed error value is ,in, is the generator speed after filtering, is the rated low-speed shaft speed, is the calculation coefficient based on the hyperbolic function, the expression is: ； in, is the speed value tracked by the pitch controller under typhoon conditions, and They are standard cut-out wind speed and full cut-out wind speed respectively; (4) Transmitting the generator torque data to the generator controller, which adjusts the torque to the calculated value; transmitting the blade pitch angle data to the variable pitch system, which adjusts the blade pitch angle to the calculated value; (5) Determine the relationship between the current wind speed and the full cut-out wind speed and the standard cut-out wind speed. If the current wind speed is less than the full cut-out wind speed but greater than the standard cut-out wind speed, re-execute steps (3) and (4). If the current wind speed is greater than the full cut-out wind speed, stop controlling the wind turbine. At this time, the wind turbine has smoothly reduced the speed and generator power as the wind speed increases, completing the soft cut-out. Stop controlling the wind turbine until the current wind speed decreases to less than the standard cut-out wind speed.

2. The offshore wind turbine anti-typhoon soft cut-out control method according to claim 1, characterized in that: In the step (1), the laser wind radar information is filtered using the following formula to obtain the filtered wind speed; ； Where, represents the current time step, and are the wind speed before filtering and the wind speed after filtering, is the low-pass filter coefficient.

3. A typhoon-resistant soft cut-out control system for offshore wind turbines implementing the method according to claim 1, characterized in that: include: The wind speed acquisition and filtering module is used to read the laser wind radar sensor information and the meter voltage information, and filter the laser wind radar information to obtain the filtered wind speed; The first decision module is used to determine whether the filtered wind speed exceeds the set cut-out wind speed; If the filtered wind speed is greater than the set cut-out wind speed, the main control calculation module is executed, otherwise the process ends; The main control calculation module is used to receive the filtered wind speed data and calculate the optimal generator torque value and blade pitch angle value at the current moment based on the hyperbolic function calculation expression, transmit the calculated data to the generator control module and the pitch control module respectively, and send execution instructions at the same time; The generator control module is used to receive the target generator torque value calculated by the main control calculation module and execute the generator torque control instruction to adjust the generator torque to the calculated value; The pitch control module is used to receive the target blade pitch angle value calculated by the main control calculation module and execute the blade pitch angle control instruction to adjust the blade pitch angle to the calculated value; The second decision module is used to determine whether to continue starting the main control calculation module to ensure the stability of the wind turbine structure and power generation; the second decision module is also used to enable the wind turbine to smoothly reduce the speed and generator power as the wind speed increases to achieve soft cut-out.

4. An electronic device comprising a memory, a processor, and a computer program stored in the memory and configured to run on the processor, wherein: When the processor executes the computer program, the typhoon-resistant soft cut-out control method for an offshore wind turbine generator set is implemented according to any one of claims 1 to 2.

5. A computer-readable storage medium having a specific computer program stored thereon, characterized in that: When the computer program is executed by a processor, the typhoon-resistant soft cut-out control method for an offshore wind turbine generator system according to any one of claims 1 to 2 is implemented.

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