A method, system, apparatus, device and medium for preventing vortex-induced mode

Abstract

The present application belongs to the technical field of wind turbine, and relates to a standby control method, system, device, equipment and medium for preventing vortex-induced mode. The method comprises the following steps: acquiring a wind speed, based on a preset relationship matrix of impeller speed and blade pitch angle, a contrast relationship of impeller speed and vortex-induced vibration suppression effect under different wind speeds, and taking the minimum impeller speed corresponding to the pitch angle of the blade as the blade opening pitch control target value without vortex-induced vibration; in the operation stage of the wind turbine and in the case of power grid failure, the wind turbine retracts the blade to the pitch state, judges whether the standby power source needs to be cut in according to the input conditions; if the input conditions are met, the standby power source is started, and the standby anti-vortex-induced mode is entered; the pitch angle of the single or multiple blades is dynamically adjusted according to the blade opening pitch control target value; or / and, the unit yaw is perpendicular to the incoming wind speed direction to avoid the critical wind speed of vortex-induced vibration. The problem of vortex-induced vibration induced when the unit cannot enter the anti-vortex-induced mode under the condition of power grid failure is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wind turbine units, and particularly relates to a standby control method, system, device and equipment for preventing vortex-induced mode and a medium. BACKGROUND

[0002] In recent years, the trend of large-scale wind turbine units has been significantly intensified, the length of wind turbine blades has entered the era of hundreds of meters, and the height of tower drums has been continuously increasing to 180m or even higher. With the increase of unit capacity, the application of long and flexible blades and super-high tower drums, the natural frequency of blades and tower drums is continuously reduced, which easily induces vortex-induced vibration. Vortex-induced vibration refers to that when airflow passes an object, periodic shedding vortices similar to the Karman vortex street phenomenon are alternately generated on both sides of the object, thereby causing periodic vibration of the object. When the shedding frequency is close to the natural frequency of the structure, vortex-induced resonance of the structure is excited, fatigue damage of the structure is sharply increased, and the fatigue life of the structural member is reduced.

[0003] At present, the measures for preventing vortex-induced vibration of tower drums and other support structures mainly include construction stage turbulence strips, tower drum low-order resistance systems and operation stage blade vortex-induced mode, etc. The operation stage vortex-induced mode mainly adopts the following method: in the state of stopping the wind turbine unit, specifically, in order to prevent vortex-induced vibration from occurring under the condition of low wind speed, the wind turbine unit enters the vortex-induced mode, that is, the blades are pitched to a specific angle, the impeller has a certain rotating speed, the impeller is in an idle state, the airflow state is actively changed, and the periodic alternating shedding vortices generated on the surface of the tower drum are inhibited. In order to maintain the state of the vortex-induced mode, the wind turbine unit needs to absorb energy from the power grid, but if the power grid fails, the blade standby UPS battery can only supply power for ten minutes or even less. The power and capacity of the blade standby UPS battery are only enough for the blades to be pitched to the feathered state, and the blade standby UPS battery cannot provide sufficient power for maintaining the state of the vortex-induced mode. The wind turbine unit will exit the vortex-induced mode due to the lack of external power supply, which easily leads to vortex-induced vibration, and serious vortex-induced vibration may cause the tower to collapse. SUMMARY

[0004] The purpose of the application is to provide a standby control method, system, device, equipment and medium for preventing vortex-induced mode, which solves the problem of vortex-induced vibration induced when the wind turbine unit cannot enter the vortex-induced mode under the condition of power grid failure, and avoids / reduces fatigue damage caused by vortex-induced vibration.

[0005] The application is achieved by the following technical solutions:

[0006] The application discloses a standby control method for preventing vortex-induced mode, which comprises the following steps:

[0007] S1, obtaining a wind speed, and obtaining different impeller rotating speeds based on a preset relationship matrix of the impeller rotating speed and the blade pitch angle under different wind speeds;

[0008] According to the relationship between the impeller rotating speed and the vortex-induced vibration suppression effect, the vortex-induced vibration suppression effects of different impeller rotating speeds are calculated, and the minimum impeller rotating speed corresponding to the pitch angle of the blade in the non-vortex-induced vibration state is taken as the blade opening control target value;

[0009] S2, in the wind turbine operation stage, when the power grid fails, the wind turbine blades are closed to the pitch state, and whether the standby power supply needs to be cut in is judged according to the input condition;

[0010] If the input condition is met, the standby power supply is started, and the standby anti-vortex mode is entered;

[0011] If the input condition is not met, the wind turbine operating state is continuously detected;

[0012] S3, when the standby anti-vortex mode is entered, the standby power supply is controlled to supply power to the blade pitch system, and the pitch angle of a single or multiple blades is dynamically adjusted according to the blade opening control target value obtained in S1;

[0013] Or / and, the standby power supply is controlled to supply power to the yaw system of the unit, and the yaw is started to yaw the unit to be perpendicular to the incoming flow wind speed direction to avoid the critical wind speed of vortex-induced vibration.

[0014] Further, in S1, the relationship matrix of the impeller rotating speed and the blade pitch angle is obtained in advance, specifically:

[0015] First, the critical wind speed of vortex-induced vibration corresponding to at least the first three order frequencies of the tower is calculated;

[0016] Based on the wind turbine whole machine aeroelastic model, the relationship matrix of the single or multiple blade opening angle and the impeller rotating speed under different critical wind speeds is calculated.

[0017] Further, in S1, the relationship between the impeller rotating speed and the vortex-induced vibration suppression effect is specifically:

[0018] Through fluid simulation or unit multi-body dynamics calculation method, the minimum impeller rotating speed value under different critical wind speeds without vortex-induced vibration is calculated.

[0019] Further, in S2, whether the standby power supply needs to be cut in is judged according to the input condition, and the input condition includes wind speed, airflow shedding frequency, fatigue load value or vibration frequency; Specifically, the following cases are divided:

[0020] 1) Based on the wind speed measurement input, when the wind speed reaches any order vortex-induced vibration critical wind speed, the standby power supply is started, and the standby anti-vortex mode is entered;

[0021] 2) Based on the airflow shedding frequency measurement input, when the airflow shedding frequency deviates from the natural frequency of the first three orders of the tower by less than 10%, the standby power supply is started, and the standby anti-vortex mode is entered;

[0022] 3) based on the load measurement or vibration measurement input, if the fatigue load value reaches the fatigue load threshold value, or the vibration frequency reaches the resonance frequency threshold value, the standby power supply is started, and the standby anti-vortex mode is entered.

[0023] Further, 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 order frequencies of the tower drum;

[0024] The calculation expression is:

[0025] The tower drum is represented as The critical wind speed corresponding to the vortex-induced vibration of the tower drum is represented as The first The natural frequency of the tower drum is represented as is a positive integer; The Strouhal number is represented as The cross-sectional diameter of the tower drum is represented as

[0026] The first The natural frequency of the tower drum is calculated by the wind turbine whole machine model.

[0027] Further, when the tower drum is in the hoisting stage, for the vortex-induced vibration suppression using auxiliary equipment, the standby power supply is used as the energy input of the auxiliary equipment, and at the same time, the frequency modulation function should be provided to realize the speed regulation of the auxiliary equipment to cope with vortex-induced vibration of different orders of the tower drum.

[0028] The application further discloses a vortex-induced vibration prevention mode standby system for realizing the standby control method, which comprises a data acquisition unit, a storage unit, a control unit, a blade opening pitch control target calculation unit and an input condition judgment unit.

[0029] The storage unit stores the critical wind speed of the vortex-induced vibration corresponding to at least the first three order frequencies of the tower drum, the relationship matrix of the impeller speed and the blade pitch angle, and the contrast relationship between the impeller speed and the vortex-induced vibration suppression effect.

[0030] The data acquisition unit is used to acquire input parameters, and the input parameters include the wind speed, the airflow shedding frequency, the fatigue load value or the vibration frequency.

[0031] The blade opening pitch control target calculation unit is used to obtain different impeller speeds based on the relationship matrix of the preset impeller speed and the blade pitch angle under different wind speeds according to the acquired wind speed; and the vortex-induced vibration suppression effect of different impeller speeds is calculated according to the contrast relationship between the impeller speed and the vortex-induced vibration suppression effect, so that the blade opening pitch control target value is taken as the pitch angle corresponding to the minimum impeller speed without vortex-induced vibration.

[0032] The input condition judging unit is used for judging whether the standby power supply needs to be cut in when the wind turbine is in the operation stage and the power grid fails, and the blades are collected to the pitch state according to the input condition corresponding to the acquired input parameter.

[0033] If the input condition is met, the standby power supply is started, and the standby anti-vortex mode is entered.

[0034] If the input condition is not met, the wind turbine operation state is continuously detected.

[0035] The control unit is used for controlling the standby power supply to supply power to the blade pitch system after entering the standby anti-vortex mode, and dynamically adjusting the pitch angle of a single or multiple blades according to the blade pitch control target value.

[0036] Or / and, the standby power supply is controlled to supply power to the yaw system, and the yaw is started to yaw the unit to be perpendicular to the direction of the incoming flow wind speed, and to avoid the critical wind speed of vortex-induced vibration.

[0037] The application further discloses a standby device of an anti-vortex mode, which comprises the standby system, the yaw system, the blade pitch system and the standby power supply.

[0038] The standby power supply is connected with the yaw system through a first control switch, and the standby power supply is connected with the blade pitch system through a second control switch.

[0039] The control unit is electrically connected with the standby power supply, the first control switch and the second control switch.

[0040] The application further discloses a computer device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, and the processor implements the steps of the standby control method of the anti-vortex mode when the computer program is executed.

[0041] The application further discloses a computer readable storage medium, which stores a computer program, and the computer program implements the steps of the standby control method of the anti-vortex mode when the computer program is executed by a processor.

[0042] Compared with the prior art, the application has the following beneficial technical effects:

[0043] The application discloses a backup control method of a vortex-induced mode, with the development of large-scale wind turbine generators, when the wind turbine generators are in some extreme working conditions such as extreme wind speed, freezing and other conditions that may cause power grid power loss, three blades are all in the feathering state without power input, and cannot enter the preset vortex-induced vibration prevention mode, at this time, vortex-induced vibration is prone to occur for the large-scale wind turbine generator, and the safety risk of the wind turbine generator is great. The backup control method provided by the application calculates the corresponding relationship between the impeller rotating speed and the blade pitch angle under different wind speed conditions and the control method of the vortex-induced mode through simulation means, further provides a backup power supply system for providing the energy input of the vortex-induced mode for the wind turbine generator when the power grid power loss, and clearly indicates that the vortex-induced mode state is kept through the pitch and yaw actions, vortex-induced vibration is effectively avoided, fatigue damage risk caused by the vortex-induced vibration is reduced, and the operation safety of the wind turbine generator is improved.

[0044] In addition, vortex-induced vibration is prone to occur in the hoisting tower stage of the wind turbine generator, and the backup power supply scheme can provide power input for the active spoiler device. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 A flow chart of the backup control method of the vortex-induced mode of the application;

[0046] Figure 2 A block diagram of the backup device of the vortex-induced mode of the application.

[0047] Figure 3 A design and calculation flow of the blade pitch control target value of the application. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical scheme and advantages of the application more clear and explicit, the following is further described in detail in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the application, and are not used to limit the application, that is, the described examples are only a part of the examples of the application, but not all examples.

[0049] The components described and shown in the drawings and examples of the application can be arranged and designed in various different configurations, therefore, the detailed description of the examples of the application provided in the following drawings is not intended to limit the scope of the claimed application, but only represents a selected embodiment of the application. Based on the drawings and examples of the application, all other examples obtained by those skilled in the art without creative labor are within the protection scope of the application.

[0050] It is to be understood that the terms "comprising," "including," and other

[0051] First, let's introduce the basic principles of how the tower vibration generates natural frequencies.

[0052] A wind turbine tower is an elastic structure. When subjected to external excitations (such as wind, mechanical vibrations, etc.), it will vibrate. According to vibration theory, any elastic body has its own vibration characteristics, which are determined by factors such as mass distribution, geometric shape, material properties, etc.

[0053] From a physical perspective, the tower can be regarded as composed of countless tiny particles, which are connected to each other through elastic forces. When external forces act on the tower, these particles will deviate from their equilibrium positions and produce displacement. Due to the elastic connection between particles, they will be subjected to restoring forces, thus generating vibrations.

[0054] Natural frequency refers to the frequency of free vibration of a structure without external damping and external excitation. For a wind turbine tower, it has multiple natural frequencies because its vibration can have multiple modes.

[0055] The reasons for generating each order of natural frequency are as follows:

[0056] 1. First-order natural frequency (bending vibration)

[0057] When the tower is fixed at the bottom and the top is subjected to a transverse force (such as lateral wind), 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 mainly manifests as the lateral swing of the tower.

[0058] The size of the first-order natural frequency mainly depends on the height, diameter, wall thickness, and elastic modulus of the material of the tower. For example, a higher tower usually has a lower first-order natural frequency because it is more likely to swing with a larger amplitude under the action of wind.

[0059] 2. Second-order natural frequency (torsional vibration)

[0060] In addition to bending vibration, the tower can also undergo torsional vibration. When the point of action of the wind is not on the central axis of the tower or due to the imbalance of the wind wheel, a torque will act on the tower, causing the tower to undergo torsional vibration. The frequency of this torsional vibration is the second-order natural frequency.

[0061] The second order natural frequency is related to the cross-sectional shape of the tower, the shear modulus of the material, and other factors. For example, a tower with a circular cross-section has good performance in torsion, with relatively large torsional stiffness, and the second order natural frequency is also relatively high.

[0062] 3. High order natural frequency (complex vibration mode)

[0063] With the complexity of the vibration mode, high order natural frequencies appear. These high order modes can involve local vibration of the tower, such as local bending of the tower wall, vibration at the node, etc.

[0064] For example, when the auxiliary equipment of the wind turbine (such as ladders, cables, etc.) is unevenly distributed inside the tower, it can cause changes in local mass distribution, leading to the appearance of local vibration modes and high order natural frequencies. These high order natural frequencies correspond to vibration modes that have an important influence on the fatigue life of the tower. In actual wind turbine operation, although the energy of high order vibration modes is relatively low, they can also cause damage to the local structure of the tower in the long-term vibration process.

[0065] The features and performance of the application are further described in detail below in conjunction with examples.

[0066] Example 1

[0067] As shown in Figure 1 , a standby control method for preventing vortex-induced vibration is provided from the design perspective, and the main steps are as follows:

[0068] S1, establish a complete machine model of the wind turbine, use professional software such as GH Bladed, FAST, Simpack, Ansys, or self-compiled finite element analysis software program to calculate the natural frequencies of the tower with / without RNA (nacelle and wind wheel assembly);

[0069] Specifically, the frequency with the nacelle corresponds to the anti-vortex vibration of the wind turbine after installation, running or stopping; the frequency without the nacelle corresponds to the vortex-induced vibration that may occur during the hoisting process of the tower.

[0070] Specifically, the natural frequency of the unit vibration is divided into first, second, third,..., Nth order, the higher the order, the higher the frequency value, and the lower the impact on the unit. In general design or engineering, only the first ten orders are considered.

[0071] S2, based on IEC61400, EN1991 and other relevant standards, calculate the critical wind speed of the vortex-induced vibration corresponding to the first three frequencies of the tower with / without RNA, which can be referred to formula (1):

[0072] (1)

[0073] In the formula: represents the tower critical wind speed corresponding to the vortex-induced vibration of the tower, m / s; represents the first natural frequency of the tower, Hz; is a positive integer; represents the Strouhal number, which is related to the form and characteristic length of the tower; represents the cross-sectional diameter of the tower, m.

[0074] S3, as shown, calculate the impeller speed and vortex-induced vibration suppression effect of the control relationship as the blade opening control target value; Figure 3

[0075] The specific calculation process of the impeller speed is as follows:

[0076] Through commercial or open source software such as GH Bladed, FAST, etc., based on the whole machine 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.

[0077] The control relationship between the impeller speed and the vortex-induced vibration suppression effect is as follows:

[0078] Through fluid simulation or multi-body dynamics calculation method of the unit, the minimum impeller speed value under different critical wind speeds is calculated, without vortex-induced vibration.

[0079] S4: During the tower hoisting stage, for the active spoiler device to suppress vortex-induced vibration, the standby power supply is used as the energy input of the active spoiler device, and at the same time, it should have frequency modulation function to realize the speed regulation of the active spoiler device to cope with different order tower vortex-induced vibration.

[0080] S5: During the operation stage of the unit, especially for the superimposed grid loss fault under low wind speed, the unit collects the blades to the feathering state through the variable pitch UPS, and judges whether the standby power supply needs to be cut in according to the input conditions. Specifically, it can be divided into the following cases:

[0081] 1) Based on the wind speed measurement input, when the wind speed reaches the critical wind speed of any order vortex-induced vibration , start the standby power supply and enter the standby anti-vortex mode;

[0082] 2) Based on the air flow shedding frequency measurement input, when the air flow shedding frequency deviates from the first three order natural frequency of the tower by less than 10%, start the standby power supply and enter the standby anti-vortex mode;

[0083] Among them, the air flow shedding frequency is obtained by direct measurement or indirect calculation.

[0084] ​3) Based on the load measurement or vibration measurement and other inputs that can directly characterize or indirectly calculate the tower cylinder in the vortex-induced vibration state, start the standby power supply and enter the standby anti-vortex mode.

[0085] There are many input conditions, such as exceeding a threshold value through load measurement, exceeding a limit value through vibration, approaching a critical wind speed, etc.

[0086] S6: When entering the standby anti-vortex mode, the standby power supply has different access methods, which are specifically divided into the following three cases:

[0087] 1) When the power grid fails, the standby power supply is started to supply power to the blade pitch system, and the blade pitch angle of a single or multiple blades is dynamically adjusted according to the blade speed target value or generator speed target value given in S3;

[0088] 2) When the power grid fails, the standby power supply is started to supply power to the yaw system, and the yaw is started to yaw the unit to be perpendicular to the incoming flow wind speed direction, actively reducing the incoming flow wind speed to avoid the vortex-induced vibration critical wind speed calculated in S2;

[0089] 3) It can be a combination of case 1) and case 2), that is, yaw and pitch operation are performed simultaneously to achieve the anti-vortex effect.

[0090] Embodiment 2

[0091] From the perspective of practical application, the standby control method of the anti-vortex mode disclosed in the application comprises the following steps:

[0092] S1, obtain the wind speed, and obtain different blade speed based on the pre-set relationship matrix of blade speed and blade pitch angle at different wind speeds;

[0093] Then, according to the control relationship between the blade speed and the vortex-induced vibration suppression effect, the vortex-induced vibration suppression effect of different blade speeds is calculated, and the minimum blade speed corresponding to the pitch angle without vortex-induced vibration is taken as the blade opening control target value;

[0094] S2, during the operation of the wind turbine, when the power grid fails, the wind turbine blades are pitched to the feathering state, and whether the standby power supply needs to be cut in is determined according to the input conditions;

[0095] If the input conditions are met, start the standby power supply and enter the standby anti-vortex mode;

[0096] If the input conditions are not met, continue to detect the operating state of the wind turbine;

[0097] S3, when entering the standby anti-vortex mode, the standby power supply supplies power to the blade pitch system, and dynamically adjusts the pitch angle of a single or multiple blades according to the blade opening control target value obtained in S1;

[0098] Or / and, control the standby power supply to the unit yaw system, start yaw, yaw the unit to be perpendicular to the incoming flow wind speed direction, avoid the critical wind speed of vortex-induced vibration.

[0099] Example 3

[0100] Taking a 2MW unit, blade length 60m, tower height 140m as an example for calculation, the unit grid-connected impeller speed is 6.5rpm, the impeller rated speed is 14rpm, the front and rear direction of the tower in the running stage The first three order natural frequencies are 0.181Hz, 1.083Hz and 2.562Hz respectively. Based on the GH Bladed established whole machine aeroelastic model of the unit, the corresponding relationship matrix of impeller speed and pitch angle under different wind speeds is calculated. Taking 4m / s and 6m / s wind speed as an example, as shown in table 1 and table 2.

[0101] Table 1: Corresponding relationship between speed and pitch angle under 4m / s wind speed

[0102]

[0103] Table 1: Corresponding relationship between speed and pitch angle under 6m / s wind speed

[0104]

[0105] Taking the first order frequency of the tower corresponding to vortex-induced vibration as an example, the critical wind speed corresponding to the first order frequency of the tower front and rear vibration is calculated. The calculation formula is as follows:

[0106] In the formula,

[0107] The calculated =4.2m / s

[0108] Referring to the impeller speed provided in table 1, through the whole machine dynamics model software of wind turbine, the minimum impeller speed without vortex-induced vibration under 4.2m / s wind speed is calculated as 0.21rpm. Therefore, for the minimum impeller speed without first order vortex-induced vibration in the front and rear direction of the tower in this example, the minimum impeller speed is controlled to be greater than 0.21rpm, and the corresponding single blade pitch angle is recommended to be controlled to be 30deg~60deg. When the multi-blade pitch is adjusted, at least two blades are adjusted to be less than 75deg.

[0109] Example 4

[0110] The application correspondingly designs a vortex-induced vibration prevention mode standby system, which comprises a data acquisition unit, a storage unit, a control unit, a blade opening pitch control target calculation unit and an input condition judgment unit.

[0111] The storage unit stores a critical wind speed corresponding to vortex-induced vibration of at least the first three orders of frequency of the tower drum, a relationship matrix of the blade pitch angle and the impeller speed, and a contrast relationship of the impeller speed and the vortex-induced vibration suppression effect;

[0112] The data acquisition unit is configured to acquire input parameters, including a wind speed, an airflow shedding frequency, a fatigue load value, or a vibration frequency.

[0113] The blade pitch control target calculation unit is configured to obtain different impeller speeds based on the relationship matrix of the blade pitch angle and the impeller speed at different wind speeds according to the acquired wind speed, and calculate the vortex-induced vibration suppression effect of different impeller speeds according to the contrast relationship of the impeller speed and the vortex-induced vibration suppression effect, so as to take the blade pitch angle corresponding to the minimum impeller speed at which vortex-induced vibration does not occur as a blade pitch control target value.

[0114] The input condition judgment unit is configured to judge whether the standby power source needs to be cut in when the wind turbine is in an operating phase and the power grid fails, and the blades are pitched to a feathered state according to the input condition corresponding to the acquired input parameters.

[0115] If the input condition is met, the standby power source is started, and a standby anti-vortex mode is entered.

[0116] If the input condition is not met, the operating state of the wind turbine is continuously detected.

[0117] The control unit is configured to control the standby power source to supply power to the blade pitch system when the standby anti-vortex mode is entered, and dynamically adjust the pitch angle of a single blade or multiple blades according to the blade pitch control target value.

[0118] Or / and, the control unit is configured to control the standby power source to supply power to the yaw system, start yawing, and yaw the wind turbine to be perpendicular to the direction of the incoming wind speed to avoid the critical wind speed of vortex-induced vibration.

[0119] Embodiment 5

[0120] As shown in Figure 2 , the application discloses a standby device of an anti-vortex mode, which comprises the standby system, the yaw system, the blade pitch system, and the standby power source.

[0121] The standby power source is connected with the yaw system through a first control switch, and the standby power source is connected with the blade pitch system through a second control switch.

[0122] The control unit is electrically connected with the standby power source, the first control switch, and the second control switch.

[0123] Embodiment 6

[0124] The application further 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 executes the computer program to implement the steps of the backup control method of the anti-vortex mode, the memory can include an internal memory such as a high-speed random memory, and can also include a non-volatile memory such as at least one disk memory; the processor, the network interface, and the memory are connected to each other through an internal bus, which can be an industry standard architecture bus, a peripheral component interconnect standard bus, an extended industry standard architecture bus, etc., and the bus can be divided into an address bus, a data bus, a control bus, etc.; the memory is used to store a program, specifically, the program can include program code, and the program code includes computer operation instructions; and the memory can include an internal memory and a non-volatile memory, and provide instructions and data for the processor.

[0125] Embodiment 7

[0126] The application further discloses a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the steps of the backup control method of the anti-vortex mode, 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 can include a random storage memory and / or a cache memory, etc. The non-volatile memory can include a read-only memory, a hard disk, a flash memory, an optical disk, a magnetic disk, etc.

[0127] Those skilled in the art should understand that the embodiments of the application can be provided as a method, a system, or a computer program product. Therefore, the application can adopt a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the application can adopt a computer program product implemented on one or more computer usable storage media (including but not limited to a disk memory, an optical memory, etc.) containing computer usable program codes.

[0128] The application is described with reference to flowcharts and / or block diagrams of the method, device (system), and computer program product according to the embodiments of the application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a means for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one flow or multiple flows and / or blocks Figure 1 The functions specified in one flow or multiple flows and / or blocks

[0129] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the flow Figure 1 one or more flow or block Figure 1 one or more blocks or blocks specified in the flow.

[0130] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions executed on the computer or other programmable apparatus provide steps for implementing the flow Figure 1 one or more flow or block Figure 1 one or more blocks or blocks specified in the flow.

[0131] Finally, it should be noted that the above-mentioned embodiments are merely used to illustrate the technical solutions of the present application, rather than limiting the same. Even though the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and any modification or replacement without departing from the spirit and scope of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A method for preventing vortex-induced mode of a backup control, characterized in that, The method comprises the following steps: S1, obtaining a wind speed, and obtaining different impeller rotating speeds based on a preset relationship matrix of the impeller rotating speed and the blade pitch angle under different wind speeds; Then, the vortex-induced vibration suppression effect of different impeller rotating speeds is calculated according to the control relationship between the impeller rotating speed and the vortex-induced vibration suppression effect, and the pitch angle corresponding to the minimum impeller rotating speed without vortex-induced vibration is taken as a blade opening control target value; S2, in the operation stage of the wind turbine and in the case of power grid failure, the blades of the wind turbine are closed to the pitch state, and whether the standby power supply needs to be cut in is judged according to the input condition; If the input condition is met, the standby power supply is started, and the standby anti-vortex mode is entered; If the input condition is not met, the operation state of the wind turbine is continuously detected; S3, after entering the standby anti-vortex mode, the standby power supply is controlled to supply power to the blade pitch system, and the pitch angle of a single or multiple blades is dynamically adjusted according to the blade opening control target value obtained in S1; Or / and, the standby power supply is controlled to supply power to the yaw system of the unit, the yaw is started, and the unit is yawed to be perpendicular to the direction of the incoming flow wind speed, so as to avoid the critical wind speed of vortex-induced vibration; In S1, the relationship matrix of the impeller rotating speed and the blade pitch angle is obtained in advance, and specifically: The critical wind speed of vortex-induced vibration corresponding to at least the first three order frequencies of the tower is calculated; Based on the whole machine aeroelastic model of the wind turbine, the relationship matrix of the opening angle of a single or multiple blades and the impeller rotating speed under different critical wind speeds is calculated; In S2, whether the standby power supply needs to be cut in is judged according to the input condition, and the input condition includes the wind speed, the airflow shedding frequency, the fatigue load value or the vibration frequency; Specifically, the following cases are divided: 1) Based on the wind speed measurement input, when the wind speed reaches the critical wind speed of any order vortex-induced vibration, the standby power supply is started, and the standby anti-vortex mode is entered; 2) Based on the airflow shedding frequency measurement input, when the airflow shedding frequency deviates from the natural frequency of any one of the first three orders of the tower by less than 10%, the standby power supply is started, and the standby anti-vortex mode is entered; 3) Based on the load measurement or vibration measurement input, if the fatigue load value reaches the fatigue load threshold value, or the vibration frequency reaches the resonance frequency threshold value, the standby power supply is started, and the standby anti-vortex mode is entered.

2. The method according to claim 1, wherein In S1, the control relationship between the impeller rotating speed and the vortex-induced vibration suppression effect is specifically: The minimum impeller rotating speed value without vortex-induced vibration under different critical wind speeds is calculated by fluid simulation or unit multi-body dynamics calculation method.

3. The method according to claim 1, wherein The critical wind speed of vortex-induced vibration is specifically the critical wind speed of vortex-induced vibration corresponding to at least the first three order frequencies of the tower; The computational expression is: representing the tower the critical wind speed corresponding to the vortex shedding; representing the tower the natural frequency; is a positive integer; representing the Strouhal number, which is related to the tower form and characteristic length; representing the tower cross-sectional diameter; The tower section The natural frequency is calculated by the wind turbine model.

4. The method of claim 1, wherein, When the tower is in the hoisting stage, for the auxiliary equipment used to suppress vortex-induced vibration, the standby power supply is used as the energy input of the auxiliary equipment, and at the same time, the frequency modulation function should be provided to realize the speed regulation of the auxiliary equipment to cope with vortex-induced vibration of different orders of the tower.

5. A stand-by system for preventing vortex-induced mode, which implements the stand-by control method according to any one of claims 1 to 4, characterized in that, The method comprises 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 of vortex-induced vibration corresponding to at least the first three order frequencies of the tower, the relationship matrix of the impeller rotating speed and the blade pitch angle, and the control relationship between the impeller rotating speed and the vortex-induced vibration suppression effect. The data acquisition unit is configured to acquire input parameters, the input parameters including a wind speed, an airflow shedding frequency, a fatigue load value, or a vibration frequency. The blade pitch control target calculation unit is configured to obtain different impeller rotating speeds based on a preset relationship matrix between the impeller rotating speed and the blade pitch angle at different wind speeds according to the acquired wind speed; and calculate a vortex-induced vibration suppression effect of the different impeller rotating speeds according to a contrast relationship between the impeller rotating speed and the vortex-induced vibration suppression effect, so as to take a pitch angle corresponding to a minimum impeller rotating speed at which the vortex-induced vibration does not occur as a blade pitch control target value. The input condition judgment unit is configured to, when the wind turbine is in an operation stage and a power grid fails, collect the blades of the wind turbine to a pitch status, and determine whether the standby power source needs to be switched in according to an input condition corresponding to the acquired input parameters. If the input condition is met, the standby power source is started, and the standby anti-vortex mode is entered. If the input condition is not met, the operation state of the wind turbine is continuously detected. The control unit is configured to, when the standby anti-vortex mode is entered, control the standby power source to supply power to the blade pitch system, and dynamically adjust the pitch angle of a single blade or multiple blades according to the blade pitch control target value. Or / and, control the standby power source to supply power to the yaw system, start yaw, and yaw the wind turbine to be perpendicular to the direction of the incoming wind speed to avoid the critical wind speed of the vortex-induced vibration.

6. A back-up device against vortex-induced mode, characterized in that, The yaw system, the blade pitch system, the standby power source, and the standby system of claim 5 are included. The standby power source is connected with the yaw system through a first control switch, and the standby power source is connected with the blade pitch system through a second control switch. The control unit is electrically connected with the standby power source, the first control switch, and the second control switch.

7. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, The processor executes the computer program to realize the steps of the standby control method of the anti-vortex mode according to any one of claims 1 to 4.

8. A computer-readable storage medium storing a computer program, the computer program comprising instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 7. The computer program is executed by the processor to realize the steps of the standby control method of the anti-vortex mode according to any one of claims 1 to 4.

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