Wind power plant tower sweeping prevention method and device and wind power plant unit system

Abstract

The invention relates to a wind power plant tower sweeping prevention method and device and a wind power plant unit system, and relates to the technical field of wind power systems, and the wind power plant tower sweeping prevention method comprises the following steps: obtaining current operation data and first reference operation data of each unit in a target wind power plant; according to the current operation data, the first reference operation data and a first preset data threshold value, outputting a first signal or outputting a second signal; and if the first signal is output, executing a wind power plant overall protection strategy. According to the wind power plant tower sweeping prevention method and device and the wind power plant unit system provided by the embodiment of the invention, the time node of the cold wave attack can be accurately identified, the specific measures are taken in time, and the potential safety hazard is eliminated.

Description

Technical Field

[0001] The present application relates to the technical field of wind power systems, and in particular to a method and device for preventing tower sweeping in a wind farm, and a wind farm unit system. Background Art

[0002] For wind farms, as cold waves hit, relevant environmental parameters will change dramatically, which may easily lead to adverse operating conditions. The units in wind farms are prone to tower sweeping problems, causing serious safety hazards. In related technologies, the time node of the cold wave cannot be accurately identified, resulting in delayed response measures and safety hazards. Summary of the invention

[0003] In order to solve the above technical problems, the embodiments of the present application provide a wind farm tower sweep prevention method, device and wind farm unit system, which can accurately identify the time node of the cold wave, take targeted measures in time, and eliminate safety hazards.

[0004] In a first aspect, a method for preventing tower sweeping in a wind farm is provided, comprising:

[0005] Acquire current operating data and first reference operating data of each unit in the target wind farm; wherein the current operating data includes current ambient temperature, current negative shear ratio, current wind speed and current wind direction angle; the first reference operating data includes first reference ambient temperature, first reference negative shear ratio, first reference wind speed and first reference wind direction angle; the time node corresponding to the first reference operating data differs from the time node corresponding to the current operating data by a first preset time period;

[0006] Output a first signal or output a second signal according to the current operating data, the first reference operating data and a first preset data threshold; wherein the first preset data threshold includes a first preset ambient temperature threshold, a first preset negative shear ratio threshold, a first preset wind speed threshold and a first preset wind direction angle threshold; the first signal represents a signal of an incoming cold wave; the second signal represents a signal of an upcoming cold wave;

[0007] If the first signal is output, the overall protection strategy of the wind farm is executed.

[0008] According to the first aspect of the present application, if the first signal is output, executing the overall protection strategy of the wind farm includes:

[0009] If the first signal is output, a detection signal output by two main shaft distance sensors of each of the units is obtained;

[0010] According to the detection signal, the position deviation value of the two main shafts of each unit is obtained;

[0011] If more than a preset proportion of the position deviation values ​​of the generator sets are greater than a first preset deviation threshold, the overall wind farm protection strategy is executed.

[0012] According to the first aspect of the present application, after executing the wind farm overall protection strategy, the wind farm tower sweep prevention method further includes:

[0013] If the position deviation values ​​of all the generator sets are less than or equal to a second preset deviation threshold, the overall wind farm protection strategy is exited.

[0014] According to a first aspect of the present application, outputting a first signal or outputting a second signal according to the current operating data, the first reference operating data, and a first preset data threshold includes:

[0015] If there is at least one of the units that satisfies the first condition, the first signal is output; wherein the first condition indicates that the change between the current ambient temperature and the first reference ambient temperature is greater than the first preset ambient temperature threshold, the change between the current negative shear ratio and the first reference negative shear ratio is greater than the first preset negative shear ratio threshold, the change between the current wind speed and the first reference wind speed is greater than the first preset wind speed threshold, and the change between the current wind direction angle and the first reference wind direction angle is greater than the first preset wind direction angle threshold;

[0016] If all the units do not meet the first condition, the second signal is output.

[0017] According to the first aspect of the present application, after outputting the second signal, the wind farm tower sweep prevention method further includes:

[0018] Acquire detection signals output by two main shaft distance sensors of each of the units;

[0019] According to the detection signal, the position deviation value of the two main shafts of each unit is obtained;

[0020] If there is a target unit whose position deviation value is greater than the first preset deviation threshold, a single-unit protection strategy is executed for the target unit.

[0021] According to the first aspect of the present application, after executing the single-machine protection strategy for the target unit, the wind farm tower sweep prevention method further includes:

[0022] If the position deviation value of the target unit is less than or equal to the first preset deviation threshold, the single-machine protection strategy is exited.

[0023] According to the first aspect of the present application, after the overall protection strategy of the wind farm is executed, the wind farm tower sweep prevention method further includes:

[0024] Acquire second reference operating data; wherein the second reference operating data includes a second reference ambient temperature, a second reference negative shear ratio, a second reference wind speed, and a second reference wind direction angle; a time node corresponding to the second reference operating data differs from a time node corresponding to the current operating data by a second preset time period;

[0025] Output a third signal or output a fourth signal according to the current operating data, the second reference operating data and the second preset data threshold; wherein the second preset data threshold includes a second preset ambient temperature threshold, a second preset negative shear ratio threshold, a second preset wind speed threshold and a second preset wind direction angle threshold; the third signal represents a signal that the cold wave has ended; the second signal represents a signal that the cold wave has not ended;

[0026] If the third signal is output, the overall wind farm protection strategy is exited.

[0027] According to the first aspect of the present application, outputting a third signal or outputting a fourth signal according to the current operating data, the second reference operating data, and the second preset data threshold includes:

[0028] If all the units meet the second condition, the third signal is output; wherein the second condition indicates that the change between the current ambient temperature and the second reference ambient temperature is greater than the second preset ambient temperature threshold, the change between the current negative shear ratio and the second reference negative shear ratio is greater than the second preset negative shear ratio threshold, the change between the current wind speed and the second reference wind speed is greater than the second preset wind speed threshold, and the change between the current wind direction angle and the second reference wind direction angle is greater than the second preset wind direction angle threshold;

[0029] If there is at least one of the units that does not satisfy the second condition, the fourth signal is output.

[0030] According to the first aspect of the present application, before obtaining the current operating data and the first reference operating data of each unit in the target wind farm, the wind farm tower sweep prevention method further includes:

[0031] According to a plurality of selected cold wave start times, the first preset data threshold is selected from historical operation data, and the first preset time period is selected from a plurality of first reference time periods; wherein the historical operation data includes a plurality of historical ambient temperatures, a plurality of historical negative shear ratios, a plurality of historical wind speeds, and a plurality of historical wind direction angles;

[0032] According to a plurality of selected cold wave end moments, the second preset data threshold is screened out from historical operation data, and the second preset time period is screened out from a plurality of second reference time periods.

[0033] In a second aspect, a wind farm tower sweep prevention device is also provided, comprising:

[0034] A first acquisition module is used to acquire current operating data and first reference operating data of each unit in the target wind farm; wherein the current operating data includes current ambient temperature, current negative shear ratio, current wind speed and current wind direction angle; the first reference operating data includes first reference ambient temperature, first reference negative shear ratio, first reference wind speed and first reference wind direction angle; the time node corresponding to the first reference operating data differs from the current time node by a first preset time period;

[0035] A first output module, configured to output a first signal or a second signal according to the current operating data, the first reference operating data and a first preset data threshold; wherein the first preset data threshold includes a first preset ambient temperature threshold, a first preset negative shear ratio threshold, a first preset wind speed threshold and a first preset wind direction angle threshold; the first signal represents a signal of an incoming cold wave; and the second signal represents a signal of an upcoming cold wave;

[0036] The first execution module is configured to execute an overall protection strategy for the wind farm if the first signal is output.

[0037] In a third aspect, a wind farm unit system is also provided, including:

[0038] Multiple units;

[0039] The wind farm tower sweep prevention device as described in the previous embodiment is communicatively connected to multiple units.

[0040] In a fourth aspect, an electronic device is also provided, comprising: a processor; and a memory for storing instructions executable by the processor; wherein the processor is used to execute the wind farm preventive tower sweeping method described in the above embodiment.

[0041] In a fifth aspect, a computer-readable storage medium is also provided, wherein the storage medium stores a computer program, and the computer program is used to execute the wind farm preventive tower sweeping method described in the above embodiment.

[0042] The wind farm tower sweep prevention method, device and wind farm unit system provided in the embodiments of the present application can determine the change amount of different parameter data of the current operating data relative to the different parameter data in the first reference operating data by comparing the current operating data with the corresponding data in the first reference operating data, and then determine whether a cold wave is coming at the current time node by judging the size relationship between the change amount of different parameters and the threshold value of the corresponding parameter in the first preset data threshold value; that is, with the help of the four parameter indicators related to the cold wave, namely, ambient temperature, negative shear ratio, wind speed and wind direction angle, it can accurately identify the time node of the cold wave, and promptly adopt an overall wind farm protection strategy to collectively protect the units in the wind farm, avoid tower sweep problems among the units in the wind farm, and eliminate safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same first reference numerals generally represent the same components or steps.

[0044] Figure 1 A schematic flow chart of a wind farm tower sweep prevention method provided as an exemplary embodiment of the present application.

[0045] Figure 2 A schematic flow chart of executing an overall wind farm protection strategy when a first signal is output is provided as an exemplary embodiment of the present application.

[0046] Figure 3 A schematic flow chart of a wind farm tower sweep prevention method provided as another exemplary embodiment of the present application.

[0047] Figure 4 A schematic diagram of a flow chart of outputting a first signal or outputting a second signal according to current operating data, first reference operating data and a first preset data threshold is provided for an exemplary embodiment of the present application.

[0048] Figure 5 A schematic flow chart of a wind farm tower sweep prevention method provided as another exemplary embodiment of the present application.

[0049] Figure 6 A schematic flow chart of a wind farm tower sweep prevention method provided as another exemplary embodiment of the present application.

[0050] Figure 7 A schematic flow chart of a wind farm prevention method provided as another exemplary embodiment of the present application.

[0051] Figure 8 A schematic diagram of a flow chart of outputting a third signal or outputting a fourth signal according to current operating data, second reference operating data and a second preset data threshold is provided as an exemplary embodiment of the present application.

[0052] Fig. 9 A schematic flow chart of a wind farm tower sweep prevention method provided as another exemplary embodiment of the present application.

[0053] Fig.10 A structural block diagram of a wind farm tower sweep prevention device provided as an exemplary embodiment of the present application.

[0054] Fig.11 A structural block diagram of a wind farm tower sweep prevention device provided for another exemplary embodiment of the present application.

[0055] Fig.12 A structural block diagram of a wind farm unit system provided by an exemplary embodiment of the present application.

[0056] Fig.13 A schematic diagram of the structure of an electronic device provided as an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0057] Below, the exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the exemplary embodiments described here.

[0058] Figure 1 The following is a flow chart of a wind farm tower sweep prevention method provided by an exemplary embodiment of the present application. Figure 1 As shown, the wind farm tower sweep prevention method provided by the embodiment of the present application may include:

[0059] S210: Acquire current operating data and first reference operating data of each unit in the target wind farm.

[0060] Specifically, the current operating data may include the current ambient temperature, the current negative shear ratio, the current wind speed, and the current wind direction angle.

[0061] It should be understood that when a cold wave hits, the ambient temperature will change dramatically, so the change in ambient temperature can be used as one of the indicators to determine whether a cold wave is coming. To this end, during the operation of the unit, the current ambient temperature of the area where each unit is located can be obtained in real time.

[0062] In one embodiment, the temperature detected by the temperature sensor at the current time node can be used as the current ambient temperature; or, the average value of all temperatures detected within a period of time (e.g., 15 minutes, 20 minutes, etc.) before the current time node can be used as the aforementioned current ambient temperature.

[0063] It should be noted that the current negative shear ratio can be understood as the ratio of the time span of negative shear (the situation where wind speed decreases with increasing height) within a period of time before the current time node (for example, 15 minutes, 20 minutes, etc.) to the total time span (for example, the aforementioned 15 minutes, 20 minutes, etc.).

[0064] In one embodiment, data detected by the spindle distance sensor on the unit can be obtained to determine whether the unit has a negative shear condition within a period of time. The specific calculation method for determining whether a negative shear condition has occurred is introduced in the relevant technology and will not be repeated here.

[0065] It should be understood that when a cold wave hits, the wind speed will change dramatically, and correspondingly, the proportion of negative shear conditions in the unit will increase. Therefore, the change in the proportion of negative shear can be used as one of the indicators to determine whether a cold wave is coming. Similarly, the change in wind speed can also be used as one of the indicators to determine whether a cold wave is coming.

[0066] It should be understood that when a cold wave hits, the direction of the wind that the unit is exposed to will also change. Therefore, the wind direction angle (with the unit as a reference object) can also be used as one of the indicators of whether a cold wave is coming.

[0067] It should be noted that the aforementioned first reference operating data may include a first reference ambient temperature, a first reference negative shear ratio, a first reference wind speed, and a first reference wind direction angle.

[0068] In actual applications, the current ambient temperature, the current negative shear ratio, the current wind speed and the current wind direction angle are respectively compared with the first reference ambient temperature, the first reference negative shear ratio, the first reference wind speed and the first reference wind direction angle to determine their respective changes, thereby determining whether a cold wave is coming. The determination process is introduced later.

[0069] It should be noted that the difference between the first reference operating data and the aforementioned current operating data lies in the different time nodes for acquiring the data, but the acquisition methods are similar. Therefore, the method for acquiring the first reference operating data can refer to the method for acquiring the aforementioned current operating data, which will not be repeated here.

[0070] It should be noted that the time node corresponding to the first reference operating data differs from the time node corresponding to the current operating data by a first preset time period. That is, the time node corresponding to the current operating data minus the first preset time period is obtained to obtain the time node corresponding to the first reference operating data.

[0071] In one embodiment, the first preset time period may be 6 hours, 12 hours, 18 hours, 24 hours, etc. In practical applications, a suitable first preset time period may be screened out from multiple time periods according to requirements, and the specific screening process will be described in detail later.

[0072] S220: Output a first signal or output a second signal according to current operating data, first reference operating data, and a first preset data threshold.

[0073] Specifically, the first preset data threshold may include a first preset ambient temperature threshold, a first preset negative shear ratio threshold, a first preset wind speed threshold, and a first preset wind direction angle threshold.

[0074] It should be noted that the current ambient temperature, the first reference ambient temperature and the first preset ambient temperature threshold correspond to each other, the current negative shear ratio, the first reference negative shear ratio and the first preset negative shear ratio threshold correspond to each other, the current wind speed, the first reference wind speed and the first preset wind speed threshold correspond to each other, and the current wind direction angle, the first reference wind direction angle and the first preset wind direction angle threshold correspond to each other.

[0075] It should be noted that the first preset ambient temperature threshold, the first preset negative shear ratio threshold, the first preset wind speed threshold and the first preset wind direction angle threshold can be screened from historical operation data according to needs, and the specific screening process will be introduced in detail later.

[0076] In practical applications, by comparing the current operating data with the corresponding data in the first reference operating data, the change amount of different parameter data of the current operating data relative to the different parameter data in the first reference operating data can be determined, and then by determining the size relationship between the change amount of different parameters and the threshold value of the corresponding parameter in the first preset data threshold value, it can be determined whether a cold wave is coming at the current time node, thereby outputting the first signal (signal of the coming cold wave) or the second signal (signal of the future cold wave). The determination process of outputting the first signal or the second signal will be described in detail later.

[0077] S230: If the first signal is output, the overall protection strategy of the wind farm is executed.

[0078] If the first signal is output, it means that the units in the wind farm are in a cold wave working condition, and the tower sweep problem is likely to occur. Specifically, after the cold wave hits, affected by the low temperature, wind speed and wind direction, the blades of the units in the wind farm are prone to deformation and the whole unit is prone to tilt, the position of the rotation plane of the blades changes, resulting in a decrease in the distance between the blades and the tower, and the blades are prone to collide with the tower during rotation, i.e., the tower sweep problem occurs.

[0079] It should be understood that, in the case of outputting the first signal, in order to timely avoid the tower sweeping problem of the units in the wind farm when the cold wave hits, step S230 is executed to execute the overall protection strategy of the wind farm. It should be noted that the overall protection strategy of the wind farm can be understood as collective protection of all units in the wind farm to prevent the tower sweeping problem of all units and eliminate the safety hazards of all units in the cold wave.

[0080] In one embodiment, the overall protection strategy of the wind farm may include controlling the blades of all units to appropriately retract the blades (eg, increasing the pitch angle of the blades) so that the wind resistance on the blades increases and the rotation speed of the blades decreases.

[0081] In one embodiment, the overall protection strategy for the wind farm may further include controlling the rotation planes of the blades of all units to move in a direction away from the tower, thereby preventing the blades from colliding with the tower.

[0082] The method for preventing tower sweeping in a wind farm provided in an embodiment of the present application can determine the amount of change of different parameter data of the current operating data relative to the different parameter data in the first reference operating data by comparing the current operating data with the corresponding data in the first reference operating data, and then determine whether a cold wave is coming at the current time node by judging the size relationship between the amount of change of different parameters and the threshold value of the corresponding parameter in the first preset data threshold value; that is, with the help of the four parameter indicators related to the coming of the cold wave, namely, the ambient temperature, the proportion of negative shear, the wind speed and the wind direction angle, it can accurately identify the time node of the coming of the cold wave, and promptly adopt an overall protection strategy for the wind farm to collectively protect the units in the wind farm, thereby avoiding the tower sweep problem of the units in the wind farm and eliminating safety hazards.

[0083] Figure 2 A schematic diagram of a flow chart of executing a wind farm overall protection strategy when a first signal is outputted is provided as an exemplary embodiment of the present application. Figure 2 As shown, step S230 may include:

[0084] S231: If the first signal is output, the detection signals output by the two main shaft distance sensors of each unit are obtained.

[0085] S232: According to the detection signal, the position deviation value of the two main shafts of each unit is obtained.

[0086] S233: If there are more than a preset proportion of units whose position deviation values ​​are greater than a first preset deviation threshold, execute the overall protection strategy of the wind farm.

[0087] It should be noted that when the first signal is output, it means that a cold wave is coming, but in actual application, the coming of a cold wave does not necessarily mean that the units in the wind farm will have a tower sweeping problem. If the overall protection strategy of the wind farm is directly implemented when a cold wave hits, it is easy to cause a large loss of power generation. Therefore, in order to reduce losses, it is necessary to determine whether each unit triggers the clearance protection when a cold wave hits (that is, to determine whether each unit has a tower sweeping risk when a cold wave hits).

[0088] Based on the above reasons, executing steps S231, S232 and S233 can determine whether there is a tower sweep risk for the units in the wind farm.

[0089] Specifically, each unit has two main shafts equipped with main shaft distance sensors, which can be used to detect the axial displacement, radial runout displacement, etc. of the corresponding main shaft. In other words, the two main shaft distance sensors can detect the position status of the two main shafts in real time. Under normal circumstances, the positions of the two main shafts relative to the tower are relatively stable, and the change between the detection values ​​of the two main shaft distance sensors (the position deviation value of the two main shafts) should also be within a reasonable range. On the contrary, if the position deviation value of the two main shafts is greater than the first preset deviation threshold, it can be considered that there is a problem with the posture of the unit, and the rotation plane of the blades has problems such as deflection and displacement, that is, it can be determined that the unit is currently at risk of sweeping the tower.

[0090] In practical applications, if the position deviation value of only a small number of units is greater than the first preset deviation threshold, then considering the impact of the overall protection strategy of the wind farm on power generation, a separate protection strategy can be implemented for the small number of units (described later). If the position deviation value of more than a preset proportion of units is greater than the first preset deviation threshold, then it can be considered that most of the units in the wind farm are at risk of tower sweeping. In order to avoid the overall impact of the cold wave on the wind farm, the overall protection strategy of the wind farm can be implemented to protect all units in the wind farm.

[0091] It should be understood that the aforementioned first preset deviation threshold and preset ratio can be set according to actual conditions, and the embodiment of the present application does not specifically limit the first preset deviation threshold and the preset ratio.

[0092] Figure 3 A schematic diagram of a wind farm tower sweep prevention method provided by another exemplary embodiment of the present application. Figure 3 As shown, after executing step S233, the wind farm tower sweep prevention method may further include:

[0093] S240: If the position deviation values ​​of all the units are less than or equal to the second preset deviation threshold, exit the overall protection strategy of the wind farm.

[0094] Specifically, if the position deviation values ​​of all units are less than or equal to the second preset deviation threshold, then it can be considered that the postures of all units are in a normal state, and the rotation plane of the blades has no obvious deflection or displacement, that is, it can be determined that all units have no tower sweep risk. Therefore, on this basis, the overall protection strategy of the wind farm can be exited to reduce the overall power generation loss of the wind farm.

[0095] It should be understood that the second preset deviation threshold can be set according to actual conditions, and the embodiment of the present application does not specifically limit the second preset deviation threshold.

[0096] In one embodiment, the first preset deviation threshold and the second preset deviation threshold may be equal or unequal.

[0097] Figure 4 A flow chart of outputting a first signal or outputting a second signal according to current operating data, first reference operating data and a first preset data threshold is provided for an exemplary embodiment of the present application. Figure 4 As shown, step S220 may include:

[0098] S221: If there is at least one unit that satisfies the first condition, output a first signal.

[0099] S222: If all units do not meet the first condition, output a second signal.

[0100] Specifically, the first condition can be understood as the change between the current ambient temperature and the first reference ambient temperature is greater than the first preset ambient temperature threshold, the change between the current negative shear ratio and the first reference negative shear ratio is greater than the first preset negative shear ratio threshold, the change between the current wind speed and the first reference wind speed is greater than the first preset wind speed threshold, and the change between the current wind direction angle and the first reference wind direction angle is greater than the first preset wind direction angle threshold.

[0101] It should be noted that, considering that the ambient temperature should drop when a cold wave hits, the aforementioned: "the change between the current ambient temperature and the first reference ambient temperature" can be considered as the decrease in the current ambient temperature compared to the first reference ambient temperature.

[0102] Similarly, when a cold wave hits, the negative shear ratio should increase. Therefore, the aforementioned: "the change between the current negative shear ratio and the first reference negative shear ratio" can be considered as the increase in the current negative shear ratio compared to the first reference negative shear ratio.

[0103] Similarly, when a cold wave hits, the wind speed should increase. Therefore, the aforementioned: "the change between the current wind speed and the first reference wind speed" can be considered as the increase in the current wind speed compared to the first reference wind speed.

[0104] Similarly, when a cold wave hits, the wind direction angle will deviate greatly. Therefore, the aforementioned: "the change between the current wind direction angle and the first reference wind direction angle" can be considered as the deviation between the current wind direction angle and the first reference wind direction angle.

[0105] It should be noted that, due to the different locations of multiple units in a wind farm, different units have different perceptions of the onset of a cold wave. In practical applications, in order to timely and accurately determine the time node of the onset of a cold wave, step S221 is executed. If at least one unit meets the aforementioned first condition, it can be considered that the cold wave has already hit at the current time node, and the aforementioned first signal is output; otherwise, step S222 is executed. If all units do not meet the first condition, it can be considered that the cold wave will not hit, and the aforementioned second signal is output.

[0106] It should be understood that by executing steps S221 and S222, and determining whether a cold wave is coming by combining the changes in four indicators closely related to the coming of a cold wave, namely, ambient temperature, negative shear ratio, wind speed, and wind direction angle, can further improve the accuracy of identifying the time node of the coming of a cold wave, making it easier to take targeted measures in a timely manner and eliminate safety hazards.

[0107] Figure 5 A schematic flow chart of a wind farm tower sweep prevention method provided for another exemplary embodiment of the present application. After step S220, the wind farm tower sweep prevention method further includes:

[0108] S250: Acquire the detection signals output by the two main shaft distance sensors of each unit.

[0109] S260: According to the detection signal, the position deviation value of the two main shafts of each unit is obtained.

[0110] It should be noted that the execution process of step S250 and step S260 is similar to the aforementioned step S231 and step S232, respectively, and reference can be made to the above description.

[0111] S270: If there is a target unit whose position deviation value is greater than a first preset deviation threshold, a single unit protection strategy is executed for the target unit.

[0112] Specifically, when executing step S220 and outputting the second signal, that is, when a cold wave is not coming, if there is a position deviation value of the target unit that is greater than the first preset deviation threshold, it means that the target unit is still at risk of tower sweeping when the cold wave is not coming. In this case, a single-unit protection strategy can be executed for the target unit to avoid the tower sweeping problem of the target unit.

[0113] In one embodiment, the single-machine protection strategy may include controlling the blades of the target unit to appropriately retract the blades (eg, increasing the pitch angle of the blades) so that the wind resistance on the blades increases and the rotation speed of the blades decreases.

[0114] In one embodiment, the single-machine protection strategy may further include controlling the rotation plane of the blades of the target unit to move in a direction away from the tower, thereby preventing the blades from colliding with the tower.

[0115] Figure 6 A schematic diagram of a wind farm tower sweep prevention method provided by another exemplary embodiment of the present application. Figure 6 As shown, after step S270, the wind farm tower sweep prevention method may further include:

[0116] S280: If the position deviation value of the target unit is less than or equal to the first preset deviation threshold, exit the single-machine protection strategy.

[0117] It should be understood that after executing step S270, the overall posture of the target unit will be improved, and the position of the rotation plane of the corresponding blade will also change. When the position deviation value of the target unit is less than or equal to the first preset deviation threshold, it can be considered that the target unit has eliminated the tower sweep risk. At this time, the corresponding single-unit protection strategy can be exited, and the target unit can be restored to a normal working state to ensure the power generation of the target unit.

[0118] Figure 7 A schematic flow chart of a wind farm prevention method provided by another exemplary embodiment of the present application. Figure 7 As shown, after step S230, the wind farm tower sweep prevention method may further include:

[0119] S290: Acquire second reference operating data.

[0120] S310: Output a third signal or output a fourth signal according to current operating data, second reference operating data and a second preset data threshold.

[0121] S320: If the third signal is output, exit the overall protection strategy of the wind farm.

[0122] It should be noted that after step S230, the system executes the overall protection strategy of the wind farm to prevent the units from being affected by the cold wave and causing the tower sweeping problem. However, the implementation of the overall protection strategy of the wind farm will significantly reduce the overall power generation of the wind farm. Therefore, in order to ensure that the units in the wind farm can resume normal operation in time, it is necessary to monitor in real time whether the cold wave has ended.

[0123] Specifically, the aforementioned second reference operating data may include a second reference ambient temperature, a second reference negative shear ratio, a second reference wind speed, and a second reference wind direction angle.

[0124] It should be noted that the difference between the second reference operating data and the aforementioned current operating data is that the time nodes for acquiring the data are different, but the acquisition methods are similar. Therefore, the method for acquiring the second reference operating data can be the same as the method for acquiring the aforementioned current operating data, which will not be repeated here.

[0125] It should be noted that the time node corresponding to the second reference operating data differs from the time node corresponding to the current operating data by a second preset time period. That is, the time node corresponding to the current operating data minus the second preset time period is obtained to obtain the time node corresponding to the second reference operating data.

[0126] In one embodiment, the second preset time period may be 6 hours, 12 hours, 18 hours, 24 hours, etc. In practical applications, a suitable second preset time period may be screened out from multiple time periods according to requirements, and the specific screening process will be described in detail later.

[0127] Specifically, the aforementioned second preset data threshold may include a second preset ambient temperature threshold, a second preset negative shear ratio threshold, a second preset wind speed threshold, and a second preset wind direction angle threshold.

[0128] It should be noted that the current ambient temperature, the second reference ambient temperature and the second preset ambient temperature threshold correspond to each other, the current negative shear ratio, the second reference negative shear ratio and the second preset negative shear ratio threshold correspond to each other, the current wind speed, the second reference wind speed and the second preset wind speed threshold correspond to each other, and the current wind direction angle, the second reference wind direction angle and the second preset wind direction angle threshold correspond to each other.

[0129] It should be noted that the second preset ambient temperature threshold, the second preset negative shear ratio threshold, the second preset wind speed threshold and the second preset wind direction angle threshold can be screened from historical operation data according to needs, and the specific screening process will be introduced in detail later.

[0130] In practical applications, by comparing the current operating data with the corresponding data in the second reference operating data, the change amount of different parameter data of the current operating data relative to the different parameter data in the second reference operating data can be determined, and then by determining the size relationship between the change amount of different parameters and the threshold value of the corresponding parameter in the second preset data threshold value, it can be determined whether the current time node is the end time point of the cold wave, thereby outputting the third signal (signal of the end of the cold wave) or the fourth signal (signal of the cold wave not ending). The determination process of outputting the third signal or the fourth signal will be described in detail later.

[0131] It should be understood that when the third signal is output, executing step S320 and exiting the overall wind farm protection strategy can ensure that the units in the wind farm can resume normal operation in time when the cold wave ends, thereby reducing power generation losses.

[0132] Figure 8 A flow chart of outputting a third signal or outputting a fourth signal according to current operating data, second reference operating data and a second preset data threshold is provided as an exemplary embodiment of the present application. Figure 8 As shown, step S310 may include:

[0133] S311: If all units meet the second condition, output a third signal.

[0134] S312: If there is at least one unit that does not meet the second condition, output a fourth signal.

[0135] Specifically, the second condition characterizes that the change between the current ambient temperature and the second reference ambient temperature is greater than the second preset ambient temperature threshold, the change between the current negative shear ratio and the second reference negative shear ratio is greater than the second preset negative shear ratio threshold, the change between the current wind speed and the second reference wind speed is greater than the second preset wind speed threshold, and the change between the current wind direction angle and the second reference wind direction angle is greater than the second preset wind direction angle threshold.

[0136] It should be noted that, considering that the ambient temperature should rise when the cold wave ends, the aforementioned: "the change between the current ambient temperature and the second reference ambient temperature" can be regarded as the increase of the current ambient temperature compared to the second reference ambient temperature.

[0137] Similarly, when the cold wave ends, the negative shear ratio should decrease. Therefore, the aforementioned: "the change between the current negative shear ratio and the second reference negative shear ratio" can be considered as the decrease in the current negative shear ratio compared to the second reference negative shear ratio.

[0138] Similarly, when the cold wave ends, the wind speed should decrease. Therefore, the aforementioned: "the change between the current wind speed and the second reference wind speed" can be considered as the decrease in the current wind speed compared to the second reference wind speed.

[0139] Similarly, when the cold wave ends, the wind direction angle will deviate. Therefore, the aforementioned: "the change between the current wind direction angle and the second reference wind direction angle" can be considered as the deviation between the current wind direction angle and the second reference wind direction angle.

[0140] In actual applications, step S311 is executed. If the change between the current ambient temperature of all units and the second reference ambient temperature is greater than the second preset ambient temperature threshold, it can be considered that the ambient temperature of the current time node has undergone a huge change (a large increase) compared with the ambient temperature of the reference time node in the cold wave stage; if the change between the current negative shear ratio of all units and the second reference negative shear ratio is greater than the second preset negative shear ratio threshold, it can be considered that the negative shear ratio of the current time node has undergone a huge change (a large decrease) compared with the negative shear ratio of the reference time node in the cold wave stage; if the change between the current wind speed of all units and the second reference wind speed is greater than the second preset wind speed threshold, it can be considered that the wind speed of the current time node has undergone a huge change (a large decrease) compared with the wind speed of the reference time node in the cold wave stage; if the change between the current wind direction angle of all units and the second reference wind direction angle is greater than the second preset wind direction angle threshold, it can be considered that the wind direction angle of the current time node has undergone a huge change compared with the wind direction angle of the reference time node in the cold wave stage. In other words, the four indicators related to the arrival of the cold wave have all undergone significant changes. Therefore, it can be considered that the cold wave has ended at the current time node and the third signal can be output accordingly.

[0141] On the contrary, executing step S312, if there is at least one unit that does not meet the second condition, it can be considered that there is at least one unit still in the environment where the cold wave is coming and the cold wave has not ended. Therefore, the fourth signal can be output accordingly.

[0142] It should be understood that by executing steps S311 and S312, and determining whether the cold wave has ended by combining the changes in four indicators closely related to the cold wave, namely, ambient temperature, negative shear ratio, wind speed, and wind direction angle, the accuracy of identifying the end time node of the cold wave can be improved, so that the units in subsequent wind farms can resume normal operation in a timely manner when the cold wave ends.

[0143] Fig. 9 The following is a flow chart of a wind farm tower sweep prevention method provided by another exemplary embodiment of the present application. Fig. 9 As shown, before step S210, the wind farm tower sweep prevention method further includes:

[0144] S330: According to a plurality of selected cold wave start times, a first preset data threshold is selected from historical operation data, and a first preset time period is selected from a plurality of first reference time periods.

[0145] S340: According to multiple selected cold wave end times, a second preset data threshold is selected from the historical operation data, and a second preset time period is selected from multiple second reference time periods.

[0146] It should be noted that the historical operation data may include multiple historical ambient temperatures, multiple historical negative shear ratios, multiple historical wind speeds, and multiple historical wind direction angles. Specifically, taking the execution of step S330 as an example, a suitable first preset ambient temperature threshold may be screened out from multiple historical ambient temperatures, a first preset negative shear ratio threshold may be screened out from multiple historical negative shear ratios, a first preset wind speed threshold may be screened out from multiple historical wind speeds, and a first preset wind direction angle threshold may be screened out from multiple historical wind direction angles.

[0147] Specifically, multiple cold wave start times and corresponding cold wave end times can be selected from historical cases of the unit, and each group of corresponding cold wave start times and cold wave end times corresponds to a cold wave stage.

[0148] When selecting the start time of a cold wave, it is necessary to refer to the earliest tower sweeping time corresponding to the start time of the cold wave in historical cases. For example, the screening condition needs to be set to the time node corresponding to the start time of the cold wave two hours before the earliest tower sweeping time; similarly, when selecting the end time of a cold wave, it is necessary to refer to the latest tower sweeping time corresponding to the end time of the cold wave in historical cases. For example, the screening condition needs to be set to the time node corresponding to the end time of the cold wave two hours after the latest tower sweeping time. In this way, it can be ensured that the cold wave protection strategy is activated between the selected cold wave start time and the corresponding cold wave end time (due to the aforementioned screening conditions, it is guaranteed that tower sweeping occurs in all selected cold wave stages, so the cold wave protection strategy is activated).

[0149] It should be noted that the execution process of step S330 is similar to that of step S340. Execution of step S330 and step S340 may include:

[0150] Calculate the change A1 of the historical ambient temperature at the beginning of the cold wave, the change B1 of the historical negative shear ratio, the change C1 of the historical wind speed, and the change D1 of the historical wind direction angle compared with the previous K1 hours (i.e., the aforementioned first reference time period); calculate the change A2 of the historical ambient temperature at the end of the cold wave, the change B2 of the historical negative shear ratio, the change C2 of the historical wind speed, and the change D2 of the historical wind direction angle compared with the previous K2 hours (i.e., the aforementioned second reference time period).

[0151] Replace the K1 value (in actual applications, K1 can be replaced with 6 hours, 12 hours, 18 hours, 24 hours, etc.) and the K2 value (in actual applications, K2 can be replaced with 6 hours, 12 hours, 18 hours, 24 hours, etc.), traverse all selected cold wave start times and cold wave end times, and obtain multiple sets of cold wave stages corresponding to the cold wave start time, the corresponding cold wave end time, the corresponding K1 value, the corresponding K2 value, the corresponding change A1, the corresponding change B1, the corresponding change C1, the corresponding change D1, the corresponding change B2, the corresponding change C2, and the corresponding change D2.

[0152] Then, by setting evaluation indicators, the optimal K1 value, the optimal K2 value, the optimal change amount A1, the optimal change amount B1, the optimal change amount C1, the optimal change amount D1, the optimal change amount B2, the optimal change amount C2, and the optimal change amount D2 can be screened out. The optimal K1 value is the aforementioned first preset time period. The optimal K2 value is the aforementioned second preset time period. The optimal change amount A1, the optimal change amount B1, the optimal change amount C1, and the optimal change amount D1 constitute the aforementioned first preset data threshold. The optimal change amount A2, the optimal change amount B2, the optimal change amount C2, and the optimal change amount D2 constitute the aforementioned second preset data threshold.

[0153] It should be noted that the aforementioned evaluation indicators may include power generation loss, false alarm rate, etc.

[0154] In one embodiment, if the power generation loss is used as a single evaluation indicator, the corresponding K1 value, K2 value, change A1, change B1, change C1, change D1, change A2, change B2, change C2, and change D2 when the power generation loss is the smallest (the power generation lost in the cold wave stage is converted according to the power curve) can be screened out, that is, the first preset time period, the second preset time period, the first preset data threshold and the second preset data threshold are obtained.

[0155] In one embodiment, if the false alarm rate loss is used as a single evaluation indicator, the K1 value, K2 value, change A1, change B1, change C1, change D1, change A2, change B2, change C2, and change D2 corresponding to the time when the false alarm rate is the smallest can be screened out, that is, the first preset time period, the second preset time period, the first preset data threshold, and the second preset data threshold are obtained.

[0156] In one embodiment, if the power generation loss and the false alarm rate are used as comprehensive evaluation indicators and the power generation and the false alarm rate are weighted, the K1 value, K2 value, change A1, change B1, change C1, change D1, change A2, change B2, change C2, and change D2 corresponding to the minimum weighted value can be screened out, that is, the first preset time period, the second preset time period, the first preset data threshold, and the second preset data threshold are obtained.

[0157] Fig.10 This is a structural block diagram of a wind farm tower sweep prevention device provided by an exemplary embodiment of the present application. Fig.10 As shown, the wind farm tower sweep prevention device 500 provided in the embodiment of the present application may include: a first acquisition module 510, used to obtain the current operating data and first reference operating data of each unit in the target wind farm; wherein the current operating data includes the current ambient temperature, the current wind direction angle, the current wind speed and the current wind direction angle; the first reference operating data includes the first reference ambient temperature, the first reference wind direction angle, the first reference wind speed and the first reference wind direction angle; the time node corresponding to the first reference operating data differs from the current time node by a first preset time period; a first output module 520, used to output a first signal or a second signal according to the current operating data, the first reference operating data and the first preset data threshold; wherein the first preset data threshold includes a first preset ambient temperature threshold, a first preset wind direction angle threshold, a first preset wind speed threshold and a first preset wind direction angle threshold; the first signal represents a signal of an incoming cold wave; the second signal represents a signal of an upcoming cold wave; a first execution module 530, used to execute the overall protection strategy of the wind farm if the first signal is output.

[0158] The wind farm tower sweep prevention device provided in the embodiment of the present application can determine the change amount of different parameter data of the current operating data relative to the different parameter data in the first reference operating data by comparing the current operating data with the corresponding data in the first reference operating data, and then determine whether a cold wave is coming at the current time node by judging the size relationship between the change amount of different parameters and the threshold value of the corresponding parameter in the first preset data threshold value; that is, with the help of the four parameter indicators related to the coming of the cold wave, namely, the ambient temperature, the negative shear ratio, the wind speed and the wind direction angle, it can accurately identify the time node of the coming of the cold wave, and promptly adopt the overall protection strategy of the wind farm to collectively protect the units in the wind farm, thereby avoiding the tower sweep problem of the units in the wind farm and eliminating safety hazards.

[0159] Fig.11 This is a structural block diagram of a wind farm tower sweep prevention device provided by another exemplary embodiment of the present application. Fig.11As shown, in one embodiment, the first execution module 530 may include: a second acquisition module 531, which is used to obtain the detection signal output by the two main shaft distance sensors of each unit if the first signal is output; a first calculation module 532, which is used to obtain the position deviation value of the two main shafts of each unit according to the detection signal; and a second execution module 533, which is used to execute the overall protection strategy of the wind farm if there are units with position deviation values ​​exceeding a preset proportion that are greater than a first preset deviation threshold.

[0160] like Fig.11 As shown, in one embodiment, the wind farm tower sweep prevention device 500 may further include: a first exit module 540, which is used to exit the overall wind farm protection strategy if the position deviation values ​​of all units are less than or equal to a second preset deviation threshold.

[0161] like Fig.11 As shown, in one embodiment, the first output module 520 may include: a second output module 521, used to output a first signal if there is at least one unit that satisfies the first condition; wherein the first condition characterizes that the change between the current ambient temperature and the first reference ambient temperature is greater than the first preset ambient temperature threshold, the change between the current negative shear ratio and the first reference negative shear ratio is greater than the first preset negative shear ratio threshold, the change between the current wind speed and the first reference wind speed is greater than the first preset wind speed threshold, greater than the first preset wind speed threshold, and the change between the current wind direction angle and the first reference wind direction angle is greater than the first preset wind direction angle threshold; the third output module 522 is used to output a second signal if all units do not meet the first condition.

[0162] like Fig.11 As shown, in one embodiment, the wind farm tower sweep prevention device 500 may also include: a third acquisition module 550, used to obtain the detection signal output by the two main shaft distance sensor of each unit; a second calculation module 560, used to obtain the position deviation value of the two main shafts of each unit according to the detection signal; a third execution module 570, used to execute a single-machine protection strategy for the target unit if the position deviation value of the target unit is greater than the first preset deviation threshold.

[0163] like Fig.11 As shown, in one embodiment, the wind farm tower sweep prevention device 500 may further include: a second exit module 580, which is used to exit the single-machine protection strategy if the position deviation value of the target unit is less than or equal to the first preset deviation threshold.

[0164] like Fig.11As shown, in one embodiment, the wind farm tower sweep prevention device 500 may also include: a fourth acquisition module 590, used to acquire second reference operating data; wherein the second reference operating data includes a second reference ambient temperature, a second reference negative shear ratio, a second reference wind speed and a second reference wind direction angle; the time node corresponding to the second reference operating data differs from the time node corresponding to the current operating data by a second preset time period; a fourth output module 610, used to output a third signal or output a fourth signal according to the current operating data, the second reference operating data and the second preset data threshold; wherein the second preset data threshold includes a second preset ambient temperature threshold, a second preset negative shear ratio threshold, a second preset wind speed threshold and a second preset wind direction angle threshold; the third signal represents a signal that the cold wave has ended; the second signal represents a signal that the cold wave has not ended; a third exit module 620, used to exit the overall protection strategy of the wind farm if the third signal is output.

[0165] like Fig.11 As shown, in one embodiment, the fourth output module 610 may include: a fifth output module 611, which is used to output a third signal if all units meet the second condition; wherein the second condition indicates that the change between the current ambient temperature and the second reference ambient temperature is greater than the second preset ambient temperature threshold, the change between the current negative shear ratio and the second reference negative shear ratio is greater than the second preset negative shear ratio threshold, the change between the current wind speed and the second reference wind speed is greater than the second preset wind speed threshold, the change between the current wind direction angle and the second reference wind direction angle is greater than the second preset wind direction angle threshold; a sixth output module 612, which is used to output a fourth signal if there is at least one unit that does not meet the second condition;

[0166] like Fig.11 As shown, in one embodiment, the wind farm tower sweep prevention device 500 may also include: a first screening module 630, used to screen out a first preset data threshold from the historical operation data according to multiple selected cold wave start times, and screen out a first preset time period from multiple first reference time periods; wherein the historical operation data includes multiple historical ambient temperatures, multiple historical negative shear ratios, multiple historical wind speeds, and multiple historical wind direction angles; a second screening module 640, used to screen out a second preset data threshold from the historical operation data according to multiple selected cold wave end times, and screen out a second preset time period from multiple second reference time periods.

[0167] Fig.12 The structural block diagram of a wind farm unit system provided by an exemplary embodiment of the present application. Fig.12As shown, the wind farm unit system 700 provided in the embodiment of the present application may include multiple units 710 and the wind farm tower cleaning prevention device 500 as described in the previous embodiment, and the wind farm tower cleaning prevention device 500 is communicatively connected to the multiple units 710.

[0168] The wind farm unit system 700 provided in the embodiment of the present application has all the functions of the wind farm tower sweep prevention device 500, and its beneficial effects can refer to the beneficial effects of the aforementioned wind farm tower sweep prevention device 500.

[0169] Fig.13 A schematic diagram of the structure of an electronic device provided by an exemplary embodiment of the present application. The electronic device 900 may be any one or both of the first device and the second device, or a stand-alone device independent of them, and the stand-alone device may communicate with the first device and the second device to receive the collected input signals from them.

[0170] like Fig.13 As shown, the electronic device 900 includes one or more processors 910 and a memory 920. The memory 920 is used to store instructions executable by the processor 910, and the processor 910 is used to execute the wind farm preventive tower sweeping method described in the above embodiment.

[0171] The processor 910 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 900 to perform desired functions.

[0172] The memory 920 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, a random access memory (RAM) and / or a cache memory (cache), etc. The non-volatile memory may include, for example, a read-only memory (ROM), a hard disk, a flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 910 may run the program instructions to implement the control methods of the various embodiments of the present application described above and / or other desired functions. Various contents such as input signals, signal components, noise components, etc. may also be stored in the computer-readable storage medium.

[0173] In one example, the electronic device 900 may further include: an input device 930 and an output device 940 , and these components are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0174] When the electronic device is a stand-alone device, the input device 930 may be a communication network connector for receiving collected input signals from the first device and the second device.

[0175] In addition, the input device 930 may also include, for example, a keyboard, a mouse, and the like.

[0176] The output device 940 can output various information to the outside, including the determined distance information, direction information, etc. The output device 940 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, and the like.

[0177] Of course, to simplify, Fig.13 Only some of the components related to the present application in the electronic device 900 are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, according to specific application situations, the electronic device 900 may also include any other appropriate components.

[0178] The computer program product may be written in any combination of one or more programming languages ​​to write program codes for performing the operations of the embodiments of the present application, including object-oriented programming languages, such as Java, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0179] The computer readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can include, for example, but is not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0180] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0181] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0182] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0183] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0184] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A wind farm tower sweep prevention method, characterized in that: include: Acquire current operating data and first reference operating data of each unit in the target wind farm; wherein the current operating data includes current ambient temperature, current negative shear ratio, current wind speed and current wind direction angle; the first reference operating data includes first reference ambient temperature, first reference negative shear ratio, first reference wind speed and first reference wind direction angle; the time node corresponding to the first reference operating data differs from the time node corresponding to the current operating data by a first preset time period; Output a first signal or output a second signal according to the current operating data, the first reference operating data and a first preset data threshold; wherein the first preset data threshold includes a first preset ambient temperature threshold, a first preset negative shear ratio threshold, a first preset wind speed threshold and a first preset wind direction angle threshold; the first signal represents a signal of an incoming cold wave; the second signal represents a signal of an upcoming cold wave; If the first signal is output, the overall protection strategy of the wind farm is executed.

2. The wind farm tower sweep prevention method according to claim 1, characterized in that: If the first signal is output, executing the overall protection strategy of the wind farm includes: If the first signal is output, a detection signal output by two main shaft distance sensors of each of the units is obtained; According to the detection signal, the position deviation value of the two main shafts of each unit is obtained; If more than a preset proportion of the position deviation values ​​of the generator sets are greater than a first preset deviation threshold, the overall wind farm protection strategy is executed.

3. The wind farm tower sweep prevention method according to claim 2, characterized in that: After executing the wind farm overall protection strategy, the wind farm tower sweep prevention method further includes: If the position deviation values ​​of all the generator sets are less than or equal to a second preset deviation threshold, the overall wind farm protection strategy is exited.

4. The wind farm tower sweep prevention method according to claim 1, characterized in that: The outputting a first signal or a second signal according to the current operating data, the first reference operating data and a first preset data threshold comprises: If there is at least one of the units that satisfies the first condition, the first signal is output; wherein the first condition indicates that the change between the current ambient temperature and the first reference ambient temperature is greater than the first preset ambient temperature threshold, the change between the current negative shear ratio and the first reference negative shear ratio is greater than the first preset negative shear ratio threshold, the change between the current wind speed and the first reference wind speed is greater than the first preset wind speed threshold, and the change between the current wind direction angle and the first reference wind direction angle is greater than the first preset wind direction angle threshold; If all the units do not meet the first condition, the second signal is output.

5. The wind farm tower sweep prevention method according to claim 1, characterized in that: After outputting the second signal, the wind farm tower sweep prevention method further includes: Acquire detection signals output by two main shaft distance sensors of each of the units; According to the detection signal, the position deviation value of the two main shafts of each unit is obtained; If there is a target unit whose position deviation value is greater than the first preset deviation threshold, a single-unit protection strategy is executed for the target unit.

6. The wind farm tower sweep prevention method according to claim 5, characterized in that: After executing the single-machine protection strategy for the target unit, the wind farm tower sweep prevention method further includes: If the position deviation value of the target unit is less than or equal to the first preset deviation threshold, the single-machine protection strategy is exited.

7. The wind farm tower sweep prevention method according to claim 1, characterized in that: After the overall protection strategy of the wind farm is executed, the wind farm tower sweep prevention method further includes: Acquire second reference operating data; wherein the second reference operating data includes a second reference ambient temperature, a second reference negative shear ratio, a second reference wind speed, and a second reference wind direction angle; a time node corresponding to the second reference operating data differs from a time node corresponding to the current operating data by a second preset time period; Output a third signal or output a fourth signal according to the current operating data, the second reference operating data and the second preset data threshold; wherein the second preset data threshold includes a second preset ambient temperature threshold, a second preset negative shear ratio threshold, a second preset wind speed threshold and a second preset wind direction angle threshold; the third signal represents a signal that the cold wave has ended; the second signal represents a signal that the cold wave has not ended; If the third signal is output, the overall wind farm protection strategy is exited.

8. The wind farm tower sweep prevention method according to claim 7, characterized in that: The outputting a third signal or a fourth signal according to the current operating data, the second reference operating data and the second preset data threshold comprises: If all the units meet the second condition, the third signal is output; wherein the second condition indicates that the change between the current ambient temperature and the second reference ambient temperature is greater than the second preset ambient temperature threshold, the change between the current negative shear ratio and the second reference negative shear ratio is greater than the second preset negative shear ratio threshold, the change between the current wind speed and the second reference wind speed is greater than the second preset wind speed threshold, and the change between the current wind direction angle and the second reference wind direction angle is greater than the second preset wind direction angle threshold; If there is at least one of the units that does not satisfy the second condition, the fourth signal is output.

9. The wind farm tower sweep prevention method according to claim 7, characterized in that: Before obtaining the current operation data and the first reference operation data of each unit in the target wind farm, the wind farm preventive tower sweeping method further includes: According to a plurality of selected cold wave start times, the first preset data threshold is selected from historical operation data, and the first preset time period is selected from a plurality of first reference time periods; wherein the historical operation data includes a plurality of historical ambient temperatures, a plurality of historical negative shear ratios, a plurality of historical wind speeds, and a plurality of historical wind direction angles; According to a plurality of selected cold wave end moments, the second preset data threshold is screened out from historical operation data, and the second preset time period is screened out from a plurality of second reference time periods.

10. A wind farm tower sweep prevention device, characterized in that: include: A first acquisition module is used to acquire current operating data and first reference operating data of each unit in the target wind farm; wherein the current operating data includes current ambient temperature, current negative shear ratio, current wind speed and current wind direction angle; the first reference operating data includes first reference ambient temperature, first reference negative shear ratio, first reference wind speed and first reference wind direction angle; the time node corresponding to the first reference operating data differs from the current time node by a first preset time period; A first output module, configured to output a first signal or a second signal according to the current operating data, the first reference operating data and a first preset data threshold; wherein the first preset data threshold includes a first preset ambient temperature threshold, a first preset negative shear ratio threshold, a first preset wind speed threshold and a first preset wind direction angle threshold; the first signal represents a signal of an incoming cold wave; and the second signal represents a signal of an upcoming cold wave; The first execution module is configured to execute an overall protection strategy for the wind farm if the first signal is output.

11. A wind farm unit system, characterized in that: include: Multiple units; The wind farm tower sweep prevention device as claimed in claim 10 is communicatively connected to a plurality of said units.

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