Standby control method, system, device and equipment for vortex-induced mode and medium

Abstract

The invention belongs to the technical field of wind turbine generators, and relates to a standby control method, system, device and equipment for a vortex-induced mode and a medium. The method comprises the steps that the wind speed is obtained, and based on a preset relation matrix of the impeller rotating speed and the blade pitch angle and the contrast relation of the impeller rotating speed and the vortex-induced vibration suppression effect under different wind speeds, the pitch angle corresponding to the minimum impeller rotating speed without vortex-induced vibration serves as the blade opening control target value; in the operation stage of the wind turbine generator and when a power grid loses power, the wind turbine generator retracts blades to a feathering state, and whether a standby power supply needs to be switched in or not is judged according to input conditions; if the input condition is met, starting a standby power supply, and entering a standby anti-vortex-induced mode; dynamically adjusting the pitch angle of one or more blades according to the blade opening control target value; or / and the unit is yawed to the direction perpendicular to the incoming flow wind speed, and the critical wind speed of vortex-induced vibration is avoided. The problem of vortex-induced vibration induced when the unit cannot enter the anti-vortex-induced mode under the condition of power failure of the power grid is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind turbine generator sets, and in particular relates to a backup control method, system, device, equipment and medium for an anti-vortex excitation mode. Background Art

[0002] In recent years, the trend of large-scale wind turbines has significantly intensified. The length of wind turbine blades has entered the era of 100 meters, and the tower height has been constantly rising to 180 meters or even higher. With the increase in the capacity of single units, the use of long and flexible blades and ultra-high towers, the natural frequencies of blades and towers have continued to decrease, which is very easy to induce vortex-induced vibration. Vortex-induced vibration refers to when the airflow bypasses an object, it will alternately generate periodic shedding vortices on both sides of it, similar to the Karman vortex street phenomenon, thereby causing periodic vibration of the object. When the shedding frequency is close to the natural frequency of the structure, it will stimulate the structural vortex resonance, sharply increase the fatigue damage of the structure, and reduce the fatigue life of the structural parts.

[0003] At present, the measures for preventing vortex-induced vibration of supporting structures such as towers mainly include spoiler strips in the construction stage, low-order tower drag systems, and blade vortex-induced vibration mode in the operation stage. The vortex-induced vibration mode in the operation stage is mainly adopted when the unit is shut down. Specifically, in the low wind speed state, the wind turbine will enter the vortex-induced vibration mode to prevent vortex-induced vibration. That is, one or more blades are opened to a specific angle, so that the impeller has a certain speed, the impeller is in an idling state, and the airflow state is actively changed to inhibit the airflow from generating periodic alternating vortices on the tower surface. In order to maintain the vortex-induced vibration mode, the unit needs to absorb energy from the power grid. However, if the power grid fails, the blade backup UPS battery can only supply power for more than ten minutes or even shorter. Its power and capacity are only enough to retract the blades to the feathering state, and it cannot provide enough power to maintain the vortex-induced vibration mode. The unit will exit the vortex-induced vibration mode because there is no external power access, which is very likely to cause vortex-induced vibration. In severe cases, a tower collapse accident may occur. Summary of the invention

[0004] The purpose of the present invention is to provide a backup control method, system, device, equipment and medium for an anti-vortex excitation mode, which solves the problem of vortex-induced vibration induced when the unit cannot enter the anti-vortex excitation mode under power outage conditions, and avoids / reduces fatigue damage caused by vortex-induced vibration.

[0005] The present invention is achieved through the following technical solutions: The present invention discloses a standby control method for an anti-vortex excitation mode, comprising the following steps: S1. Obtain wind speed, and obtain different impeller speeds based on a preset relationship matrix between impeller speed and blade pitch angle at different wind speeds; Then, according to the comparison relationship between the impeller speed and the vortex-induced vibration suppression effect, the vortex-induced vibration suppression effect of different impeller speeds is calculated, and the pitch angle corresponding to the minimum impeller speed without vortex-induced vibration is used as the target value of blade opening control; S2: When the wind turbine is in operation and the grid fails, the wind turbine retracts the blades to the feathered state and determines whether to switch to the backup power supply based on the input conditions; If the input conditions are met, the backup power supply is started and the backup anti-vortex excitation mode is entered; If the input conditions are not met, continue to detect the operating status of the wind turbine; S3, when entering the standby anti-vortex excitation mode, control the standby power supply to supply power to the blade pitch control system, and dynamically adjust the pitch angle of a single blade or multiple blades according to the blade opening control target value obtained in S1; Or / and, control the backup power supply to supply power to the yaw system of the unit, start the yaw, and yaw the unit to a direction perpendicular to the incoming wind speed to avoid the critical wind speed of vortex-induced vibration.

[0006] Furthermore, in S1, the relationship matrix between the impeller speed and the blade pitch angle is designed in advance, specifically: First, calculate the critical wind speed corresponding to the vortex-induced vibration of at least the first three frequencies of the tower; Based on the aeroelastic model of the wind turbine, the relationship matrix between the opening angle of a single or multiple blades and the impeller speed under different critical wind speeds is calculated.

[0007] Furthermore, in S1, the comparison relationship between the impeller speed and the vortex-induced vibration suppression effect is specifically as follows: Through fluid simulation or unit multi-body dynamics calculation method, the minimum impeller speed value without vortex-induced vibration under different critical wind speeds is calculated.

[0008] Further, in S2, it is determined whether the backup power supply needs to be switched in based on input conditions, the input conditions including wind speed, airflow shedding frequency, fatigue load value or vibration frequency; specifically, it is divided into the following situations: 1) Based on the wind speed measurement input, when the wind speed reaches the critical wind speed of any order of vortex-induced vibration, the backup power supply is started and the backup anti-vortex-induced vibration mode is entered; 2) Based on the airflow shedding frequency measurement input, when the airflow shedding frequency deviates from any of the first three natural frequencies of the tower by less than 10%, the backup power supply is started and the backup anti-vortex excitation mode is entered; 3) Based on the load measurement or vibration measurement input, if the fatigue load value reaches the fatigue load threshold, or the vibration frequency reaches the resonance frequency threshold, the backup power supply is started and the backup anti-vortex excitation mode is entered.

[0009] Furthermore, the critical wind speed of the vortex-induced vibration is specifically the critical wind speed of the vortex-induced vibration corresponding to at least the first three frequencies of the tower; The calculation expression is:

[0010] Indicates the tower The critical wind speed corresponding to the order vortex-induced vibration; Indicates the tower order natural frequency; is a positive integer; represents the Strouhal number, which is related to the tower form and characteristic length; Indicates the cross-sectional diameter of the tower; The tower The natural frequency is calculated by the whole wind turbine model.

[0011] Furthermore, when the tower is in the hoisting stage, when auxiliary equipment is used to suppress vortex-induced vibration, the backup power supply is used as the energy input of the auxiliary equipment. At the same time, it should have a frequency modulation function to achieve speed regulation of the auxiliary equipment to cope with different orders of tower vortex-induced vibration.

[0012] The present invention also discloses a backup system for implementing the backup control method in an anti-vortex excitation mode, comprising a data acquisition unit, a storage unit, a control unit, a blade opening control target calculation unit and an input condition judgment unit; The storage unit stores the critical wind speed corresponding to the vortex-induced vibration of at least the first three frequencies of the tower, the relationship matrix between the impeller speed and the blade pitch angle, and the comparison relationship between the impeller speed and the vortex-induced vibration suppression effect; A data acquisition unit, used to acquire input parameters, the input parameters including wind speed, airflow shedding frequency, fatigue load value or vibration frequency; The blade opening control target calculation unit is used to obtain different impeller speeds based on the acquired wind speed and the preset relationship matrix between the impeller speed and the blade pitch angle under different wind speeds; and then calculate the vortex-induced vibration suppression effect of different impeller speeds based on the comparison relationship between the impeller speed and the vortex-induced vibration suppression effect, and take the minimum impeller speed corresponding to the pitch angle without vortex-induced vibration as the blade opening control target value; An input condition judgment unit is used to judge whether it is necessary to switch on the backup power supply according to the input conditions corresponding to the acquired input parameters when the wind turbine is in operation and the power grid fails, and the wind turbine retracts the blades to the feathered state; If the input conditions are met, the backup power supply is started and the backup anti-vortex excitation mode is entered; If the input conditions are not met, continue to detect the operating status of the wind turbine; A control unit is used to control the standby power supply to supply power to the blade pitch control system after entering the standby anti-vortex excitation mode, and dynamically adjust the pitch angle of a single blade or multiple blades according to the blade opening control target value; Or / and, control the backup power supply to supply power to the yaw system of the unit, start the yaw, and yaw the unit to a direction perpendicular to the incoming wind speed to avoid the critical wind speed of vortex-induced vibration.

[0013] The present invention also discloses a backup device for an anti-vortex excitation mode, comprising the backup system, a yaw system, a blade pitch control system and a backup power supply; The backup power supply is connected to the yaw system through the first control switch, and the backup power supply is connected to the blade pitch system through the second control switch; The control unit is electrically connected to the backup power supply, the first control switch and the second control switch.

[0014] The present invention also discloses a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the backup control method of the anti-vortex excitation mode when executing the computer program.

[0015] The present invention also discloses a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the backup control method of the anti-vortex excitation mode are implemented.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention discloses a backup control method for an anti-vortex-induced vibration mode. With the development of large-scale wind turbines, in some extreme working conditions such as extreme wind speeds, freezing and other situations that may cause power outages in the power grid, when there is no power input, all three blades of the wind turbine are in a feathering state, and it is impossible to enter the preset anti-vortex-induced vibration mode. At this time, for large wind turbines, vortex-induced vibration is very likely to occur, and the safety risk of the unit is extremely high. The backup control method provided by the present invention calculates the corresponding relationship between the impeller speed and the blade pitch angle under different wind speed conditions and the control method of the anti-vortex-induced vibration mode by simulation means, and further provides a backup power supply system that provides energy input for the anti-vortex-induced vibration mode for the unit when the power grid fails, and clarifies that it is kept in the anti-vortex-induced vibration mode state through variable pitch and yaw actions, effectively avoiding the occurrence of vortex-induced vibration, reducing the risk of fatigue damage caused by vortex-induced vibration, and improving the safety of unit operation.

[0017] In addition, wind turbines are prone to vortex-induced vibration during the tower hoisting stage, and the backup power supply solution can provide power input for the active spoiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of a standby control method of an anti-vortex excitation mode of the present invention; Figure 2 The block diagram of a backup device for preventing vortex excitation mode of the present invention.

[0019] Figure 3 The present invention provides a design and calculation process for the blade opening control target value. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clear, the following is further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, not all embodiments.

[0021] The components described and shown in the drawings and embodiments of the present invention may be arranged and designed in various configurations. Therefore, the detailed description of the embodiments of the present invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely represents a selected embodiment of the present invention. Based on the drawings and embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0022] It should be noted that the terms "comprises", "includes" or any other variations are intended to cover non-exclusive inclusion, so that a process, element, method, article or equipment that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to the process, element, method, article or equipment.

[0023] First, let’s introduce the basic principle of how tower vibration generates natural frequency.

[0024] The wind turbine tower is an elastic structure. When it is subjected to external excitation (such as wind force, mechanical vibration, etc.), it will vibrate. According to vibration theory, any elastic body has its own vibration characteristics, which are determined by factors such as its mass distribution, geometric shape, and material properties.

[0025] From a physical point of view, the tower can be regarded as composed of countless tiny particles, which are connected to each other by elastic forces. When an external force acts on the tower, these particles will deviate from their equilibrium positions and produce displacement. Due to the elastic connection between the particles, they will be affected by the restoring force, resulting in vibration.

[0026] The natural frequency refers to the frequency of the structure's free vibration without external damping and external excitation. For a wind turbine tower, it has multiple natural frequencies because its vibration can have multiple modes.

[0027] The reasons for the generation of each order of natural frequency are as follows: 1. First-order natural frequency (bending vibration) When the tower is fixed at the bottom and the top is subjected to lateral forces (such as lateral wind force), it will undergo bending vibration. The frequency of this bending vibration is the first-order natural frequency. In this mode, the overall shape of the tower is like a curved beam, and the vibration is mainly manifested as the lateral swing of the tower.

[0028] The magnitude of the first-order natural frequency depends mainly on factors such as the tower's height, diameter, wall thickness, and material modulus of elasticity. For example, a taller tower usually has a lower first-order natural frequency because it is more likely to swing more significantly under wind.

[0029] 2. Second-order natural frequency (torsional vibration) In addition to bending vibration, the tower may also experience torsional vibration. When the point of action of wind force is not on the central axis of the tower or due to factors such as the imbalance of the wind rotor, torque will be generated on the tower, causing torsional vibration of the tower. The frequency of this torsional vibration is the second-order natural frequency.

[0030] The second-order natural frequency is related to factors such as the cross-sectional shape of the tower and the shear modulus of the material. For example, a tower with a circular cross-section has better performance in torsion, its torsional stiffness is relatively large, and the second-order natural frequency will be correspondingly higher.

[0031] 3. High-order natural frequency (complex vibration mode) As the vibration modes become more complex, higher-order natural frequencies will appear. These higher-order modes may involve local vibrations of the tower, such as local bending of the tower wall, vibrations at nodes, etc.

[0032] For example, when the auxiliary equipment of the wind turbine (such as ladders, cables, etc.) is unevenly distributed inside the tower, it may cause changes in the local mass distribution, resulting in the emergence of local vibration modes and the generation of high-order natural frequencies. The vibration modes corresponding to these high-order natural frequencies also have an important impact on the fatigue life of the tower. In the actual operation of wind turbines, although the energy of high-order vibration modes is relatively low, they may also cause damage to the local structure of the tower during long-term vibration.

[0033] The features and performances of the present invention are further described in detail below in conjunction with the embodiments.

[0034] Example 1 like Figure 1 As shown, a backup control method for an anti-vortex excitation mode provided by the present invention is described from a design perspective, and the main steps are as follows: S1. Establish a complete model of the wind turbine and use professional software such as GH Bladed, FAST, Simpack, Ansys or self-compiled finite element analysis software to calculate the natural frequencies of the tower with or without RNA (nacelle and wind rotor assembly); Specifically, the frequency when there is a cabin corresponds to the vortex-induced vibration prevention in the running or shutdown state after the wind turbine is installed; the frequency when there is no cabin corresponds to the vortex-induced vibration that may occur during the simple tower hoisting process.

[0035] Specifically, the unit vibration natural frequency is divided into first order, second order, third order...N order. The higher the order, the greater the frequency value, and the lower the impact on the unit. In general design or engineering, only the tenth order is considered.

[0036] S2. Based on relevant standards such as IEC61400 and EN1991, the critical wind speed of the tower corresponding to the vortex-induced vibration with or without RNA is calculated, which can be referred to formula (1): (1) Where: Indicates the tower The critical wind speed corresponding to the order vortex-induced vibration, m / s; Indicates the tower Order natural frequency, Hz; is a positive integer; represents the Strouhal number, which is related to the tower form and characteristic length; Represents the tower cross-section diameter, m.

[0037] S3, such as Figure 3 As shown, the comparison relationship between the impeller speed and the vortex-induced vibration suppression effect is calculated as the target value for blade opening control; The specific calculation process of impeller speed is: Using commercial or open source software such as GH Bladed and FAST, the critical wind speeds of different wind speeds in step S2 are calculated based on the aeroelastic model of the wind turbine. The relationship matrix between the opening angle of a single blade or multiple blades and the impeller speed is shown below.

[0038] The specific relationship between the impeller speed and the vortex-induced vibration suppression effect is: Calculate different critical wind speeds through fluid simulation or unit multi-body dynamics calculation method The minimum impeller speed value at which vortex-induced vibration does not occur.

[0039] S4: During the tower hoisting stage, when an active spoiler is used to suppress vortex-induced vibration, the backup power supply is used as the energy input of the active spoiler. At the same time, it should have a frequency modulation function to achieve speed regulation of the active spoiler to cope with different orders of tower vortex-induced vibration; S5: During the unit operation phase, especially when the power grid fails in low wind speed conditions, the unit retracts the blades to the feathering state through the variable pitch UPS, and determines whether to switch to the backup power supply based on the input conditions. The specific situations are as follows: 1) Based on wind speed measurement input, when the wind speed reaches any order of vortex-induced vibration critical wind speed When the power is turned on, the backup power supply is started and the backup anti-vortex excitation mode is entered; 2) Based on the airflow shedding frequency measurement input, when the airflow shedding frequency deviates from any of the first three natural frequencies of the tower by less than 10%, the backup power supply is started and the backup anti-vortex excitation mode is entered; Among them, the unit obtains the airflow shedding frequency by direct measurement or indirect calculation.

[0040] 3) Based on load measurement or vibration measurement and other inputs that can directly characterize or indirectly infer that the tower is in a vortex-induced vibration state, start the backup power supply and enter the backup anti-vortex-induced vibration mode.

[0041] There are many input conditions, such as load measurement exceeding a threshold, vibration exceeding a limit, wind speed approaching a critical wind speed, etc.

[0042] S6: When entering the standby anti-vortex mode, the standby power supply has different access methods, which are divided into the following three situations: 1) When the power grid fails, the backup power supply starts to supply power to the blade pitch control system, and dynamically adjusts the pitch angle of a single blade or multiple blades with reference to the impeller speed target value or generator speed target value given by S3; 2) When the power grid fails, the backup power supply starts to supply power to the yaw system of the unit, starts the yaw, and yaws the unit to a direction perpendicular to the incoming wind speed, actively reducing the incoming wind speed to avoid the critical wind speed of vortex-induced vibration calculated by S2; 3) It can be a combination of case 1) and case 2), that is, yaw and pitch operation are performed simultaneously to achieve the effect of preventing vortex excitation.

[0043] Example 2 From the perspective of practical application, the present invention discloses a backup control method for an anti-vortex excitation mode, comprising the following steps: S1. Obtain wind speed, and obtain different impeller speeds based on a preset relationship matrix between impeller speed and blade pitch angle at different wind speeds; Then, according to the comparison relationship between the impeller speed and the vortex-induced vibration suppression effect, the vortex-induced vibration suppression effect of different impeller speeds is calculated, and the pitch angle corresponding to the minimum impeller speed without vortex-induced vibration is used as the target value of blade opening control; S2: When the wind turbine is in operation and the grid fails, the wind turbine retracts the blades to the feathered state and determines whether to switch to the backup power supply based on the input conditions; If the input conditions are met, the backup power supply is started and the backup anti-vortex excitation mode is entered; If the input conditions are not met, continue to detect the operating status of the wind turbine; S3, when entering the standby anti-vortex excitation mode, control the standby power supply to supply power to the blade pitch control system, and dynamically adjust the pitch angle of a single blade or multiple blades according to the blade opening control target value obtained in S1; Or / and, control the backup power supply to supply power to the yaw system of the unit, start the yaw, and yaw the unit to a direction perpendicular to the incoming wind speed to avoid the critical wind speed of vortex-induced vibration.

[0044] Example 3 A 2MW unit with a blade length of 60m and a tower height of 140m is taken as an example for calculation. The grid-connected impeller speed of the unit is 6.5rpm, the rated impeller speed is 14rpm, and the first three natural frequencies of the tower in the front and rear directions during operation are 0.181Hz, 1.083Hz, and 2.562Hz, respectively. Based on the aeroelastic model of the unit established by GH Bladed, the corresponding relationship matrix between the impeller speed and the pitch angle under different wind speeds is calculated, taking the wind speeds of 4m / s and 6m / s as examples, as shown in Tables 1 and 2.

[0045] Table 1 Corresponding relationship between rotation speed and pitch angle at 4m / s wind speed

[0046] Table 1 Corresponding relationship between rotation speed and pitch angle at 6m / s wind speed

[0047] Taking the case where the vortex-induced vibration corresponding to the first-order frequency of the tower does not occur as an example, the critical wind speed corresponding to the natural first-order frequency of the front and rear vibration of the tower of 0.181Hz is calculated, referring to the calculation formula: , where

[0048] Calculated =4.2m / s Referring to the impeller speed provided in Table 1, the wind turbine dynamics model software is used to calculate that the minimum impeller speed without vortex-induced vibration is 0.21 rpm at a wind speed of 4.2 m / s. Therefore, in this example, the minimum impeller speed without first-order vortex-induced vibration in the front and rear directions of the tower is controlled to be above 0.21 rpm, and the corresponding single-blade pitch angle is recommended to be controlled at 30 deg~60 deg. When the multi-blade pitch is changed, at least two blade pitch angles are adjusted to below 75 deg.

[0049] Example 4 The present invention correspondingly designs a backup system for the vortex-excitation prevention mode, including a data acquisition unit, a storage unit, a control unit, a blade opening control target calculation unit and an input condition judgment unit; The storage unit stores the critical wind speed corresponding to the vortex-induced vibration of at least the first three frequencies of the tower, the relationship matrix between the impeller speed and the blade pitch angle, and the comparison relationship between the impeller speed and the vortex-induced vibration suppression effect; A data acquisition unit, used to acquire input parameters, the input parameters including wind speed, airflow shedding frequency, fatigue load value or vibration frequency; The blade opening control target calculation unit is used to obtain different impeller speeds based on the acquired wind speed and the preset relationship matrix between the impeller speed and the blade pitch angle under different wind speeds; and then calculate the vortex-induced vibration suppression effect of different impeller speeds based on the comparison relationship between the impeller speed and the vortex-induced vibration suppression effect, and take the minimum impeller speed corresponding to the pitch angle without vortex-induced vibration as the blade opening control target value; An input condition judgment unit is used to judge whether it is necessary to switch on the backup power supply according to the input conditions corresponding to the acquired input parameters when the wind turbine is in operation and the power grid fails, and the wind turbine retracts the blades to the feathered state; If the input conditions are met, the backup power supply is started and the backup anti-vortex excitation mode is entered; If the input conditions are not met, continue to detect the operating status of the wind turbine; A control unit is used to control the standby power supply to supply power to the blade pitch control system after entering the standby anti-vortex excitation mode, and dynamically adjust the pitch angle of a single blade or multiple blades according to the blade opening control target value; Or / and, control the backup power supply to supply power to the yaw system of the unit, start the yaw, and yaw the unit to a direction perpendicular to the incoming wind speed to avoid the critical wind speed of vortex-induced vibration.

[0050] Example 5 like Figure 2 As shown, the present invention discloses a backup device for an anti-vortex excitation mode, including the backup system, the yaw system, the blade pitch control system and the backup power supply; The backup power supply is connected to the yaw system through the first control switch, and the backup power supply is connected to the blade pitch system through the second control switch; The control unit is electrically connected to the backup power supply, the first control switch and the second control switch.

[0051] Example 6 The present invention also discloses a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the standby control method of the anti-vortex excitation mode are implemented, wherein the memory may include a memory, such as a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk memory, etc. The processor, the network interface, and the memory are interconnected through an internal bus, and the internal bus may be an industrial standard architecture bus, a peripheral component interconnection standard bus, an extended industrial standard structure bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program may include a program code, and the program code includes computer operation instructions. The memory may include a memory and a non-volatile memory, and provide instructions and data to the processor.

[0052] Example 7 The present invention also discloses a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the standby control method of the anti-vortex excitation mode are implemented. Specifically, the computer-readable storage medium includes, but is not limited to, for example, a volatile memory and / or a non-volatile memory. The volatile memory may include a random access memory and / or a cache memory, etc. The non-volatile memory may include a read-only memory, a hard disk, a flash memory, an optical disk, a magnetic disk, etc.

[0053] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) containing computer-usable program code.

[0054] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0055] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0056] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A backup control method for an anti-vortex excitation mode, characterized in that: The following steps are involved: S1. Obtain wind speed, and obtain different impeller speeds based on a preset relationship matrix between impeller speed and blade pitch angle at different wind speeds; Then, according to the comparison relationship between the impeller speed and the vortex-induced vibration suppression effect, the vortex-induced vibration suppression effect of different impeller speeds is calculated, and the pitch angle corresponding to the minimum impeller speed without vortex-induced vibration is used as the target value of blade opening control; S2: When the wind turbine is in operation and the grid fails, the wind turbine retracts its blades to the feathered state and determines whether to switch to the backup power supply based on the input conditions; If the input conditions are met, the backup power supply is started and the backup anti-vortex excitation mode is entered; If the input conditions are not met, continue to detect the operating status of the wind turbine; S3, when entering the standby anti-vortex excitation mode, control the standby power supply to supply power to the blade pitch control system, and dynamically adjust the pitch angle of a single blade or multiple blades according to the blade opening control target value obtained in S1; Or / and, control the backup power supply to supply power to the yaw system of the unit, start the yaw, and yaw the unit to a direction perpendicular to the incoming wind speed to avoid the critical wind speed of vortex-induced vibration.

2. The backup control method of the anti-vortex excitation mode according to claim 1, characterized in that: In S1, the relationship matrix between the impeller speed and the blade pitch angle is designed in advance, specifically: First, calculate the critical wind speed of the tower corresponding to the vortex-induced vibration at least for the first three frequencies; Based on the aeroelastic model of the wind turbine, the relationship matrix between the opening angle of a single or multiple blades and the impeller speed under different critical wind speeds is calculated.

3. The backup control method of the vortex-prevention mode according to claim 1, characterized in that: In S1, the relationship between the impeller speed and the vortex-induced vibration suppression effect is as follows: Through fluid simulation or unit multi-body dynamics calculation method, the minimum impeller speed value without vortex-induced vibration under different critical wind speeds is calculated.

4. The backup control method of the vortex-prevention mode according to claim 1, characterized in that: In S2, it is determined whether the backup power supply needs to be switched on based on input conditions, which include wind speed, airflow shedding frequency, fatigue load value or vibration frequency. The specific conditions are as follows: 1) Based on the wind speed measurement input, when the wind speed reaches the critical wind speed of any order of vortex-induced vibration, the backup power supply is started and the backup anti-vortex-induced vibration mode is entered; 2) Based on the airflow shedding frequency measurement input, when the airflow shedding frequency deviates from any of the first three natural frequencies of the tower by less than 10%, the backup power supply is started and the backup anti-vortex excitation mode is entered; 3) Based on the load measurement or vibration measurement input, if the fatigue load value reaches the fatigue load threshold, or the vibration frequency reaches the resonance frequency threshold, the backup power supply is started and the backup anti-vortex excitation mode is entered.

5. The backup control method for the vortex-excitation prevention mode according to claim 1 or 2, characterized in that: The critical wind speed of the vortex-induced vibration is specifically the critical wind speed of the vortex-induced vibration corresponding to at least the first three frequencies of the tower; The calculation expression is: Indicates the tower The critical wind speed corresponding to the order vortex-induced vibration; Indicates the tower order natural frequency; is a positive integer; represents the Strouhal number, which is related to the tower form and characteristic length; Indicates the cross-sectional diameter of the tower; The tower The natural frequency is calculated by the whole wind turbine model.

6. The backup control method for vortex-prevention mode according to claim 1, characterized in that: When the tower is in the hoisting stage, when auxiliary equipment is used to suppress vortex-induced vibration, the backup power supply is used as the energy input of the auxiliary equipment. At the same time, it should have a frequency modulation function to achieve speed regulation of the auxiliary equipment to cope with different orders of tower vortex-induced vibration.

7. A backup system for preventing vortex excitation mode implementing the backup control method according to any one of claims 1 to 6, characterized in that: It includes a data acquisition unit, a storage unit, a control unit, a blade opening control target calculation unit and an input condition judgment unit; The storage unit stores the critical wind speed corresponding to the vortex-induced vibration of at least the first three frequencies of the tower, the relationship matrix between the impeller speed and the blade pitch angle, and the comparison relationship between the impeller speed and the vortex-induced vibration suppression effect; A data acquisition unit, used to acquire input parameters, the input parameters including wind speed, airflow shedding frequency, fatigue load value or vibration frequency; The blade opening control target calculation unit is used to obtain different impeller speeds based on the acquired wind speed and the preset relationship matrix between the impeller speed and the blade pitch angle under different wind speeds; and then calculate the vortex-induced vibration suppression effect of different impeller speeds based on the comparison relationship between the impeller speed and the vortex-induced vibration suppression effect, and take the minimum impeller speed corresponding to the pitch angle without vortex-induced vibration as the blade opening control target value; An input condition judgment unit is used to judge whether it is necessary to switch on the backup power supply according to the input conditions corresponding to the acquired input parameters when the wind turbine is in operation and the power grid fails, and the wind turbine retracts the blades to the feathered state; If the input conditions are met, the backup power supply is started and the backup anti-vortex excitation mode is entered; If the input conditions are not met, continue to detect the operating status of the wind turbine; A control unit is used to control the standby power supply to supply power to the blade pitch control system after entering the standby anti-vortex excitation mode, and dynamically adjust the pitch angle of a single blade or multiple blades according to the blade opening control target value; Or / and, control the backup power supply to supply power to the yaw system of the unit, start the yaw, and yaw the unit to a direction perpendicular to the incoming wind speed to avoid the critical wind speed of vortex-induced vibration.

8. A backup device for vortex-excitation prevention mode, characterized in that: It includes the backup system, yaw system, blade pitch system and backup power supply as described in claim 8; The backup power supply is connected to the yaw system through the first control switch, and the backup power supply is connected to the blade pitch system through the second control switch; The control unit is electrically connected to the backup power supply, the first control switch and the second control switch.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the backup control method for the anti-vortex excitation mode as claimed in any one of claims 1 to 6 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the backup control method for the anti-vortex excitation mode as claimed in any one of claims 1 to 6 are implemented.

Images