Method, device and main controller for determining tip speed ratio of wind turbine

Abstract

The present application discloses a method, device and main controller for determining the tip speed ratio of a wind turbine. The method for determining the tip speed ratio of a wind turbine comprises: obtaining a target wind speed interval and M preset optimal gain coefficients K opt , M is a positive integer greater than 1; based on the target wind speed range and M preset K opt , we get the wind turbine set in the target wind speed range, M preset K opt The corresponding online power of each; determine the maximum online power among all online powers; set the preset K corresponding to the maximum online power opt Determined as target K opt ; According to the target K opt Determine the target tip speed ratio of the wind turbine. The method for determining the tip speed ratio of the wind turbine provided in the present application can be used to determine the target tip speed ratio of the wind turbine according to the target K. opt The determined target tip speed ratio is more optimal, which can effectively increase the power generation of the wind turbine.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and in particular to a method, device and main controller for determining the tip speed ratio of a wind turbine. Background Art

[0002] The tip speed ratio is a very important parameter that represents the characteristics of a wind turbine. Its value will affect the power generation of the wind turbine. Therefore, it is particularly important to set the optimal tip speed ratio.

[0003] At present, the optimal gain coefficient (K) is usually set by technicians based on experience. opt ), the optimal value of the blade tip speed ratio is set, and the operation of the wind turbine is controlled based on the optimal value of the blade tip speed ratio. However, since this method depends on the experience level of the technicians, the set blade tip speed ratio may not be optimal, resulting in a lower power generation of the wind turbine. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a method, device, and main controller for determining the tip speed ratio of a wind turbine generator set, so as to solve the technical problem in the prior art that the set tip speed ratio may not be optimal, resulting in low power generation of the wind turbine generator set.

[0005] The technical solution of this application is as follows:

[0006] In a first aspect, a method for determining a tip speed ratio of a wind turbine is provided, which may include:

[0007] Get the target wind speed range and M preset optimal gain coefficients K opt , M is a positive integer greater than 1;

[0008] Based on the target wind speed range and M preset K opt , we get the wind turbine set in the target wind speed range, M preset K opt The corresponding Internet access power is as follows;

[0009] Determine the maximum Internet access power among all Internet access powers;

[0010] Set the preset K corresponding to the maximum online power opt Determined as target K opt ;

[0011] According to the target K opt Determine the target tip speed ratio of the wind turbine.

[0012] In a second aspect, a device for determining a tip speed ratio of a wind turbine is provided, which may include:

[0013] The acquisition module is used to obtain the target wind speed range and M preset optimal gain coefficients K opt , M is a positive integer greater than 1;

[0014] The power acquisition module is used to obtain the power based on the target wind speed range and M preset K opt , we get the wind turbine set in the target wind speed range, M preset K opt The corresponding Internet access power is as follows;

[0015] A first determination module is used to determine the maximum online power among all online powers;

[0016] The second determination module is used to set the preset K corresponding to the maximum online power opt Determined as target K opt ;

[0017] The third determination module is used to determine the target K opt Determine the target tip speed ratio of the wind turbine.

[0018] In a third aspect, a main controller is provided, which may include:

[0019] processor;

[0020] a memory for storing instructions executable by the processor;

[0021] The processor is configured to execute the instructions to implement the method for determining the tip speed ratio of a wind turbine generator set as shown in any one of the embodiments of the first aspect.

[0022] In a fourth aspect, a computer-readable storage medium is provided, on which computer program instructions are stored. When the computer program instructions are executed by a processor, a method for determining the tip speed ratio of a wind turbine set as shown in any one of the embodiments of the first aspect is implemented.

[0023] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0024] In this embodiment of the present application, by obtaining the target wind speed interval and M preset optimal gain coefficients K opt , based on the target wind speed range and M preset K opt , we get the wind turbine set in the target wind speed range, M preset K opt The corresponding online power is then calculated according to the target K corresponding to the maximum online power among all online powers. opt Determine the target tip speed ratio. In this way, according to the target K corresponding to the maximum online power opt , determine the target tip speed ratio, no longer rely on the experience of technicians, and can make the selected target K opt Better, so that according to the target Kopt The determined target tip speed ratio is more optimal, which can effectively increase the power generation of the wind turbine.

[0025] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application, and do not constitute an improper limitation on the present application.

[0027] Figure 1 This is a schematic diagram of an application scenario provided by an embodiment of the present application;

[0028] Figure 2 It is a flow chart of a method for determining the tip speed ratio of a wind turbine provided in an embodiment of the present application;

[0029] Figure 3 It is a schematic diagram of quadratic curve fitting provided in an embodiment of the present application;

[0030] Figure 4 It is a power curve comparison diagram provided in an embodiment of the present application;

[0031] Figure 5 It is a structural schematic diagram of a device for determining the tip speed ratio of a wind turbine provided in an embodiment of the present application;

[0032] Figure 6 It is a structural diagram of a main controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to enable ordinary persons in the art to better understand the technical solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0035] According to the background technology, K is set according to experience. optSetting the optimal value of the tip speed ratio of the wind turbine to achieve the optimal value will result in the setting of the tip speed ratio being dependent on the experience level of the technicians, which may result in the set tip speed ratio being suboptimal, resulting in lower power generation of the wind turbine.

[0036] Based on the above technical problems, the present application provides a method, device and main controller for determining the tip speed ratio of a wind turbine, which can obtain the target wind speed range and M preset optimal gain coefficients K opt , based on the target wind speed range and M preset K opt , we get the wind turbine set in the target wind speed range, M preset K opt Then, according to the target K corresponding to the maximum online power among all online powers, opt Determine the target tip speed ratio. In this way, according to the target K corresponding to the maximum online power opt , determine the target tip speed ratio, no longer rely on the experience of technicians, and can make the selected target K opt Better, so that according to the target K opt The determined target tip speed ratio is more optimal, which can effectively increase the power generation of the wind turbine.

[0037] The method for determining the tip speed ratio of a wind turbine set provided in the embodiment of the present application is described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios.

[0038] Figure 1 A schematic diagram of an application scenario provided by an embodiment of the present application is shown. The application scenario may include a wind turbine 110 and a main controller 120 of a wind farm, and each wind farm may include multiple wind turbines 110. It is understandable that Figure 1 Only three wind turbines 110 are schematically drawn in the figure. In practice, the number of wind turbines 110 may be more or less.

[0039] The wind turbine 110 may include components such as a foundation, a tower, a nacelle, a hub, and blades. Among them, the foundation can serve as the foundation of the wind turbine 110 to maintain the stability of the wind turbine 110. The tower can be used to raise the wind receiving center of the wind turbine 110 (such as the blades) to a certain height. The nacelle is a cabin that can be used to accommodate and protect the main shaft, gear box, generator and other transmission systems and other electrical equipment of the wind turbine, and can usually be made of fiberglass with light weight, high strength and corrosion resistance. The hub can be used to fix the blades and is the basis for installing the blades. The mechanical energy converted by the blades can be transferred to the main shaft. The blades are installed on the hub and can convert wind energy into mechanical energy.

[0040] The wind turbine 110 establishes a communication connection with the main controller 120 of the wind farm. In this way, the main controller 120 of the wind farm can obtain the wind speed, rotation speed, and grid power of the wind turbine 110, and can opt Determine that the wind turbine is within the target wind speed range, M preset K opt The maximum Internet power among the corresponding Internet power is calculated according to the preset K corresponding to the maximum Internet power. opt Determine the target tip speed ratio of the wind turbine.

[0041] The following is a detailed description of the method for determining the tip speed ratio of a wind turbine provided in an embodiment of the present application.

[0042] Figure 2 The figure shows a flow chart of a method for determining the tip speed ratio of a wind turbine set provided by an embodiment of the present application. The method for determining the tip speed ratio of a wind turbine set can be executed by a main controller of a wind farm. Figure 2 As shown, the method for determining the tip speed ratio of a wind turbine provided in an embodiment of the present application may include the following steps:

[0043] S210, obtaining a target wind speed range and M preset optimal gain coefficients K opt .

[0044] Wherein, M is an integer greater than 1.

[0045] K opt K is the optimal gain coefficient, which can be used to determine the generator torque of the wind turbine (the generator torque will affect the grid-connected power of the wind turbine). opt It is related to factors such as blade radius, optimal tip speed ratio, wind energy utilization coefficient, air density, etc. Specifically, K opt Can be:

[0046] K opt =(πρR 5 C p λopt) / (2λopt 3 G 3 ) (1)

[0047] Where ρ is the air density, R is the blade radius, C p is the wind energy utilization coefficient, λopt is the optimal tip speed ratio, C p λopt is the wind energy capture coefficient (maximum wind energy capture coefficient) when operating at the optimal tip speed ratio, and G is the gearbox speed ratio.

[0048] In this embodiment, K is preset opt The value of can be a multiple of the theoretical optimal value set based on experience.

[0049] The target wind speed interval may be a pre-divided wind speed interval, and the target wind speed interval may be one or more, and the number of target wind speed intervals and the specific wind speed range of each target wind speed interval are pre-set before executing the method for determining the tip speed ratio of the wind turbine set provided in this embodiment.

[0050] As an example, the target wind speed range and the preset M optimal gain coefficients K can be obtained first. opt .

[0051] As a specific example, assume that K opt It can be a multiple of the theoretical optimal value set based on experience. For example, if M is 7, 7 preset K opt The setting can be shown in Table 1. In Table 1, K opt 1 represents the first K opt , K opt 2 represents the second K opt , ..., each value in the multiple value row represents the preset K corresponding to the multiple value opt The quotient of the theoretical optimal value, that is, the preset K corresponding to each multiple value opt It should be the product of the multiple value and the theoretical optimal value, such as K opt 1 is 0.8 times the theoretical optimal value, K opt 2 is 0.85 times the theoretical optimal value.

[0052] Table 1

[0053] <![CDATA[K opt ]]> <![CDATA[K opt 1]]> <![CDATA[K opt 2]]> <![CDATA[K opt 3]]> <![CDATA[K opt 4]]> <![CDATA[K opt 5]]> <![CDATA[K opt 6]]> <![CDATA[K opt 7]]> Multiple value 0.8 0.85 0.9 0.95 1.0 1.05 1.1

[0054] S220, based on the target wind speed range and M preset K opt , we get the wind turbine set in the target wind speed range, M preset K opt The corresponding Internet power is shown below.

[0055] Among them, the grid-connected power refers to the difference between the power generated by the wind turbine and the wind turbine's own consumption.

[0056] After obtaining the target wind speed range and M preset K opt Afterwards, based on the target wind speed range and each of the preset K opt Control the operation of the wind turbine to obtain the wind turbine within the target wind speed range, each preset K opt The corresponding Internet access power is shown below. opt K opt 1. K opt 2. K opt 3. K opt 4. K opt 5. K opt 6. K opt7 as an example, based on the target wind speed range and K opt 1. Control the operation of the wind turbine group to obtain the wind turbine group K in the target wind speed range. opt 1 corresponding to the online power, and then based on the target wind speed range and K opt 2 Control the operation of the wind turbine group and obtain the wind turbine group in the target wind speed range K opt 2, and execute the corresponding grid-connected power in sequence until the wind turbine is obtained for each preset K in the target wind speed range. opt The corresponding Internet power.

[0057] It can be understood that when there are multiple target wind speed intervals, each target wind speed interval and M preset K opt Control the operation of the wind turbine to obtain the wind turbine in each target wind speed range, each preset K opt The corresponding online power is set as follows. The target wind speed intervals are 3, namely wind speed interval 1, wind speed interval 2, and wind speed interval 3. The preset K opt There are 4, namely K opt 1. K opt 2. K opt 3. K opt 4 as an example, we can use wind speed intervals 1 and K opt 1. Wind speed interval 1 and K opt 2. Wind speed interval 1 and K opt 3. Wind speed interval 1 and K opt 4. Wind speed interval 2 and K opt 1. Wind speed interval 2 and K opt 2. Wind speed interval 2 and K opt 3. Wind speed interval 2 and K opt 4. Wind speed interval 3 and K opt 1. Wind speed range 3 and K opt 2. Wind speed interval 3 and K opt 3. Wind speed interval 3 and K opt 4 Control the operation of the wind turbine and obtain the K opt 1. K opt 2. K opt 3. K opt 4 The corresponding online power, wind speed range 2 K opt 1. K opt 2. K opt 3. K opt 4 The corresponding online power, wind speed range 3 K opt 1. K opt 2. K opt 3. K opt 4The corresponding Internet access power.

[0058] S230: Determine the maximum Internet access power among all Internet access powers.

[0059] After the wind turbine is within the target wind speed range, M preset K opt After the corresponding on-grid power is obtained, the on-grid power with the largest value can be selected from all on-grid powers corresponding to the target wind speed interval, that is, the maximum on-grid power. For example, the on-grid power in the target wind speed interval can be sorted to obtain the maximum on-grid power in the target wind speed interval.

[0060] It can be understood that when there are multiple target wind speed intervals, the maximum online power among all online powers corresponding to each target wind speed interval can be determined respectively.

[0061] S240, the preset K corresponding to the maximum online power opt Determined as target K opt .

[0062] After determining the maximum online power among all online powers within the target wind speed range, the preset K corresponding to the maximum online power can be determined. opt , that is, the target K opt .

[0063] It can be understood that when there are multiple target wind speed intervals, the target K corresponding to the maximum grid-connected power in each target wind speed interval can be determined separately. opt As shown in Table 2, Table 2 takes 11 target wind speed intervals as an example and shows the target K for each target wind speed interval. opt A running result of opt The theoretical optimum value of .

[0064] Table 2

[0065] Target wind speed range 1 2 3 4 5 6 7 8 9 10 11 <![CDATA[Target K opt > 1.1a 1a 1a 1a 0.95a 0.8a 0.8a 0.85a 0.85a 0.85a 0.9a

[0066] S250, according to target K opt Determine the target tip speed ratio of the wind turbine.

[0067] As an example, after determining the target K corresponding to the maximum online power opt Afterwards, we can use the target K opt Determine the tip speed ratio of the wind turbine in the target wind speed range, that is, the target tip speed ratio. opt is the preset K corresponding to the maximum grid-connected power in the target wind speed range opt , so based on the target K opt The determined target tip speed ratio also corresponds to the maximum grid-connected power, and the power generation of the wind turbine set operating in the target wind speed range based on the target tip speed ratio is also relatively high.

[0068] It is understandable that when there are multiple target wind speed intervals, the target K of each wind speed interval can be calculated based on the target K of each wind speed interval. opt Determine the target tip speed ratio for each wind speed range. opt is the preset K corresponding to the maximum grid-connected power in each target wind speed interval opt , so based on each target K in each target wind speed interval opt The determined target tip speed ratio also corresponds to the maximum grid-connected power in the target wind speed range, and the power generation of the wind turbine set operating in the corresponding target wind speed range based on each target tip speed ratio is also relatively high.

[0069] In this embodiment of the present application, by obtaining the target wind speed interval and M preset optimal gain coefficients K opt , based on the target wind speed range and M preset K opt , we get the wind turbine set in the target wind speed range, M preset K opt Then, according to the target K corresponding to the maximum online power among all online powers, opt Determine the target tip speed ratio. In this way, according to the target K corresponding to the maximum online power opt , determine the target tip speed ratio, no longer rely on the experience of technicians, and can make the selected target K opt Better, so that according to the target K opt The determined target tip speed ratio is more optimal, which can effectively increase the power generation of the wind turbine.

[0070] Moreover, since different wind speed intervals may correspond to different target blade tip speed ratios, when there are multiple target wind speed intervals, the target blade tip speed ratio corresponding to each target wind speed interval is determined. In this way, the determined target blade tip speed ratio can be further optimized, thereby further improving the power generation of the wind turbine.

[0071] In some embodiments, the wind turbine generator system can be configured to be within the target wind speed range and the current preset K opt When the running status under the preset switching condition meets the preset switching condition, switch to the next preset K opt Accordingly, the specific implementation of the above step S220 can be as follows:

[0072] Get the i-th preset K opt . Wherein, i is a positive integer less than or equal to M;

[0073] Based on the target wind speed range and the i-th preset K opt Control the operation of the wind turbine to obtain the wind turbine in the target wind speed range and the i-th preset K opt The corresponding Internet access power;

[0074] When the wind turbine operating state meets the preset switching condition, the i-th preset K opt Switch to j-th preset K opt . Wherein, j is a positive integer less than or equal to M, and j is not equal to i;

[0075] Based on the target wind speed range and the jth preset K opt Control the operation of the wind turbine to obtain the wind turbine in the target wind speed range and the jth preset K opt The corresponding Internet power.

[0076] The preset switching condition may be a preset K opt The switching condition may be that the wind turbine runs for a preset time under the preset conditions. When the switching condition is met, the current preset K opt Switch to next preset K opt . The preset switching condition may be that the cumulative effective operation of the wind turbine is greater than or equal to the preset time. Among them, effective operation refers to the operation of the wind turbine under the conditions of grid connection, non-full power generation, non-power limit, and non-yaw. Grid connection of wind turbine refers to the connection of the wind turbine to the power grid; non-full power generation means that the operating power of the generator of the wind turbine is less than that of the generator; non-power limit means that the active power of the wind turbine is not limited by scheduling or its own reasons; non-yaw means that the heading of the wind turbine does not change with the wind direction.

[0077] As an example, we can first obtain the i-th preset K opt , control the wind turbine based on the target wind speed range and the i-th preset K opt Run, where i is a positive integer less than or equal to M. The wind turbine generator system is based on the target wind speed range and the i-th preset K opt During the operation, the online power of the wind turbine can be obtained, and the wind turbine can be obtained in the target wind speed range and the i-th preset K opt The corresponding grid power is obtained by controlling the wind turbine generator system based on the target wind speed range and the i-th preset K opt During operation, it is also possible to detect whether the operating status of the wind turbine generator set meets the preset switching conditions.

[0078] When the operating state of the wind turbine generator system meets the preset switching condition, the i-th preset K opt Switch to jth preset K opt , where j is a positive integer less than or equal to M, and j is not equal to i. The wind turbine is controlled based on the target wind speed range and the jth preset K opt Operation, the wind turbine is based on the target wind speed range and the jth preset K opt During the operation, the online power of the wind turbine can be obtained, and the wind turbine can be obtained in the target wind speed range and the jth preset Kopt The corresponding grid power is set. And the wind turbine is controlled based on the target wind speed range and the jth preset K opt During the operation, it is detected whether the operating state of the wind turbine generator set meets the preset switching condition. If the operating state of the wind turbine generator set meets the preset switching condition, the jth preset K opt Switch to next preset K opt In this way, the wind turbine is obtained within the target wind speed range, and each preset K opt The corresponding Internet power is shown below.

[0079] It can be understood that the above-mentioned target wind speed interval and M preset K opt , we get the wind turbine set in the target wind speed range, M preset K opt The specific implementation process of the corresponding online power is for a target wind speed interval. When there are multiple target wind speed intervals, the above implementation process is performed for each wind speed interval to obtain the M preset K wind turbines in each wind speed interval. opt The corresponding Internet access power is set. opt When switching, you can switch in order or not, as long as you do not switch the same preset K repeatedly. opt , and can poll all preset K opt That's it.

[0080] In this way, when the preset switching condition is met, switch to the next preset K opt , which can ensure the effectiveness of the obtained online power and determine the target K opt Providing a more accurate data basis can further improve the accuracy of the target tip speed ratio determined, and further make it possible to opt The determined target tip speed ratio is more optimal, which increases the power generation of the wind turbine.

[0081] In some embodiments, K can be preset according to a preset change rate. opt Switching can be implemented as follows:

[0082] Get K opt The preset rate of change of

[0083] Based on the preset change rate, the i-th preset K opt Switch to jth preset K opt .

[0084] As an example, when presetting K opt Before switching, a preset change rate may be obtained, which may be a preset switching slope, such as: the theoretical optimal K optThen, the preset change rate can be controlled from the i-th preset K opt Switch to jth preset K opt In this way, the preset K is set according to the preset change rate. opt Switching can avoid going directly from a preset K opt Switch to next preset K opt When the wind turbine is in a state of transient state, it will cause a jump in the wind turbine set, thereby improving the stability of the wind turbine set.

[0085] In some embodiments, the cumulative number of average values ​​of the preset variables can be obtained during the operation of the wind turbine generator system, and when the cumulative number of the average values ​​does not meet the preset optimization stop condition, the process of returning to obtain the i-th preset K value can be repeated. opt , accordingly, its specific implementation can be as follows:

[0086] Obtaining values ​​of preset variables during the operation of the wind turbine generator set according to a preset cycle, wherein the preset variables include wind speed, rotation speed, and grid-connected power;

[0087] Calculate the average value of the preset variable within the preset period, update the value of the preset variable based on the average value, and count the cumulative number of the average value.

[0088] The preset period may be a preset period for obtaining preset variables of the wind turbine generator system, such as 10 seconds.

[0089] At this time, after obtaining the wind turbine in the target wind speed range and the i-th preset K opt After downloading the corresponding Internet access power, you can also perform the following steps:

[0090] When the cumulative number of average values ​​does not meet the preset optimization stop condition, return to get the i-th preset K opt ;

[0091] When the cumulative number of average values ​​meets the preset optimization stop condition, stop obtaining the i-th preset K opt .

[0092] The preset optimization stop condition may be a preset condition for determining the end of optimization, and the preset optimization condition may include at least one of the following:

[0093] The cumulative number of average values ​​in each target wind speed interval is greater than or equal to a first preset number;

[0094] The cumulative sum of the average values ​​in all target wind speed intervals is greater than or equal to a second preset number.

[0095] Among them, the first preset number is the minimum allowable value of the cumulative number of average values ​​of a single target wind speed interval that is preset, such as 300, 400, 500, etc.; the second preset number is the minimum allowable value of the cumulative number of average values ​​of all target wind speed intervals that are preset, such as 50000, 55000, 60000, etc.

[0096] As an example, in a wind turbine generator system, based on the target wind speed interval and the i-th preset K opt During the operation, the values ​​of preset variables during the operation of the wind turbine can also be obtained according to a preset period, and the preset variables can include wind speed, rotation speed, and online power. Then, the average value of the preset variables within the preset period can be calculated, the average value of the preset variables can be updated based on the average value, and the cumulative number of the average values ​​can be counted. Taking the preset period as 10 seconds, the average values ​​of the preset variables in the previous preset period after the update at 10:00:00 (i.e., 9:59:50-10:00:00) are the wind speed average value 0, the rotation speed average value 0, and the online power average value 0, and the cumulative number of average values ​​from the start of this operation to 10:00:00 is 100 as an example, assuming that the average values ​​of the preset variables in the operation process of the wind turbine in this preset period (i.e., 10:00:00-10:00:10) obtained at 10:00:10 are the wind speed average value 1, the rotation speed average value 1, and the online power average value 1, then the average values ​​of the preset variables can be updated to the wind speed average value 1, the rotation speed average value 1, and the online power average value 1, and the cumulative number of average values ​​from the start of this operation to 10:00:00 can be updated to 101.

[0097] At this time, after obtaining the wind turbine in the target wind speed range and the i-th preset K opt After the corresponding online power is obtained, it can be determined whether the accumulated average value satisfies the preset optimization stop condition.

[0098] Specifically, when the target wind speed interval is one, the preset optimization stop condition may be that the cumulative number of average values ​​in the target wind speed interval is greater than or equal to the first preset number. When the cumulative number of average values ​​in the target wind speed interval is greater than or equal to the first preset number, it can be considered that the cumulative number of average values ​​in the target wind speed interval satisfies the preset optimization stop condition, and the acquisition of the i-th preset K can be stopped. opt , that is, no longer return to execute to obtain the i-th preset K opt , based on the target wind speed range and M preset K opt Control the operation of the wind turbine to obtain the wind turbine within the target wind speed range, M preset K optWhen the cumulative number of average values ​​in the target wind speed interval is less than the first preset number, it can be considered that the cumulative number of average values ​​in the target wind speed interval does not meet the preset optimization stop condition, and the method embodiment described above is returned to obtain the i-th preset K opt The steps are based on the target wind speed interval and M preset K opt Control the operation of the wind turbine to obtain the wind turbine within the target wind speed range, M preset K opt The corresponding Internet power is shown below.

[0099] When there are multiple target wind speed intervals, the preset optimization stop condition may be: the cumulative number of average values ​​in each target wind speed interval is greater than or equal to a first preset number, and the sum of the cumulative number of average values ​​in all target wind speed intervals is greater than or equal to a second preset number. Alternatively, the preset optimization stop condition may be: the cumulative number of average values ​​in each target wind speed interval is greater than or equal to a first preset number, or the sum of the cumulative number of average values ​​in all target wind speed intervals is greater than or equal to a second preset number. When there are multiple target wind speed intervals, the specific implementation method for determining whether the cumulative number of average values ​​satisfies the preset optimization stop condition is similar to the specific processing procedure when there is only one target wind speed interval, and will not be repeated here.

[0100] In this way, if the preset optimization stop condition is not met, return to execute to obtain the i-th preset K opt The steps are based on the target wind speed range and M preset K opt Control the operation of the wind turbine to obtain the wind turbine within the target wind speed range, M preset K opt The corresponding online power is then calculated. opt Provide a more adequate data basis for determination.

[0101] In some embodiments, when the cumulative number of average values ​​meets the preset optimization stop condition, the acquisition of the i-th preset K opt Afterwards, the wind speed interval can be re-divided, and the specific implementation method can be as follows:

[0102] Obtaining a wind speed average value in each average value of a preset variable in each target wind speed interval;

[0103] Divide wind speed intervals based on the average of all wind speeds;

[0104] The divided wind speed interval is determined as the target wind speed interval.

[0105] As an example, considering the target wind speed range and the preset K optThe wind speed during operation may not match the pre-divided target wind speed range. Therefore, when the cumulative number of average values ​​meets the preset optimization stop condition, the i-th preset K is stopped. opt Afterwards, the wind speed average value in each average value of the preset variable of each target wind speed interval can be obtained, and then the wind speed interval can be re-divided according to all the wind speed average values, and the divided wind speed interval can be determined as the target wind speed interval, that is, the divided wind speed interval is updated to the target wind speed interval. In this way, the target wind speed interval is obtained according to the wind speed obtained in the actual operation, so that the target wind speed interval can be more in line with the actual operation.

[0106] In some embodiments, the maximum value of the online power corresponding to the average values ​​of all speeds belonging to the preset speed range can be determined as the target K opt , accordingly, its specific implementation can be as follows:

[0107] Obtaining a rotation speed average value in each average value of a preset variable in each target wind speed interval;

[0108] Selecting a target speed average value belonging to a preset speed range from among all speed average values;

[0109] Obtain the target online power corresponding to the target speed average value;

[0110] Select the target K corresponding to the maximum value of the target online power opt ;

[0111] According to the target K opt Determine the target tip speed ratio of the wind turbine.

[0112] The preset speed range may be a speed range of the main function of the wind turbine generator set determined according to the minimum speed and rated speed of the wind turbine generator set, that is, the preset K opt The main operating range may be greater than the minimum speed by 0.3 rpm and less than the rated speed by 1.0 rpm.

[0113] As an example, when the cumulative number of average values ​​meets the preset optimization stop condition, stop obtaining the i-th preset K opt After that, the speed average value in each average value of all preset variables in each target wind speed interval can be obtained. Then, the speed average value belonging to the preset speed interval can be selected from all the aforementioned speed average values, that is, the target speed average value, and the target speed average value is usually multiple. After selecting the target speed average value, the online power corresponding to each target speed average value can be determined, that is, the target online power. Then, the maximum value is selected from all the target online powers to determine the preset K corresponding to the maximum value among all the target online powers. opt The target Kopt , and then based on the target K opt Determine the target tip speed ratio of the wind turbine.

[0114] As a specific example, it is also possible to preset K opt The main action range is determined by the speed and preset K opt Do quadratic curve fitting, such as Figure 3 As shown, the horizontal axis is the speed value and the vertical axis is K opt When the speed is less than the lower limit of the preset speed range, the K value corresponding to the lower limit of the preset speed range is taken. opt When the speed is greater than the upper limit of the preset speed interval, the K value corresponding to the upper limit of the preset speed interval is taken. opt value.

[0115] like Figure 4 As shown, Figure 4 It shows that based on the optimization K opt The theoretical optimal value and the target K after optimization by the method provided in the embodiment of the present application opt The power curve comparison chart obtained is: Figure 4 In the figure, the horizontal axis is wind speed, the left vertical axis is power, and the right vertical axis is power ratio. opt Compared with K before optimization opt Compared with the theoretical optimal value, the power generation is increased by 1.3165%.

[0116] In this way, the K corresponding to the maximum value of the average value of the target speed belonging to the main working speed range of the wind turbine is opt Determined as target K opt According to the target K opt Determine the target tip speed ratio. In this way, on the one hand, the target tip speed ratio determined based on the target speed average value within the main operating speed range of the wind turbine will be more in line with actual needs. On the other hand, filtering out the speed average value that does not belong to the main operating range of the wind turbine can reduce the amount of calculation to a certain extent and improve the efficiency of the method for determining the tip speed ratio of the wind turbine.

[0117] It can be understood that, in addition to the above-mentioned average value based on the preset variables to obtain the target K opt In addition to the method, the target K can also be obtained by other methods such as linear interpolation. opt .

[0118] In some embodiments, the target tip speed ratio may be determined in combination with the air density, and the corresponding specific implementation method may be as follows:

[0119] Get the air density;

[0120] According to the air density and target Kopt , determine the target tip speed ratio of the wind turbine.

[0121] As an example, the air density can be obtained first, and then the air density and the target K can be used to calculate the air density. opt , determine the target tip speed ratio of the wind turbine. For example, the target tip speed ratio can be calculated by the following formula:

[0122] K opt =(ρ·π·R 5 ·C P ) / (2·TSR) (2)

[0123] Where ρ is the air density, R is the blade radius, C P is the ratio of the blade tip linear velocity to the wind speed, and TSR is the tip speed ratio.

[0124] In this way, the target tip speed ratio is determined in combination with the air density, and the influence of the air density is further considered, so that the accuracy of the target tip speed ratio can be further improved, and the power generation of the wind turbine can be further improved.

[0125] Based on the same inventive concept, the present application also provides a device for determining the tip speed ratio of a wind turbine. Figure 5 As shown, the present application also provides a device 500 for determining a tip speed ratio of a wind turbine generator set, which may include:

[0126] The acquisition module 510 can be used to obtain the target wind speed range and M preset optimal gain coefficients K opt , M is a positive integer greater than 1;

[0127] The power acquisition module 520 can be used to obtain the power of the target wind speed interval and M preset K opt , we get the wind turbine set in the target wind speed range, M preset K opt The corresponding Internet access power is as follows;

[0128] The first determination module 530 may be used to determine the maximum Internet access power among all Internet access powers;

[0129] The second determination module 540 can be used to determine the preset K corresponding to the maximum online power. opt Determined as target K opt ;

[0130] The third determination module 550 can be used to determine the target K opt Determine the target tip speed ratio of the wind turbine.

[0131] In some embodiments, the power acquisition module 520 may include:

[0132] The first acquisition unit can be used to obtain the i-th preset Kopt , i is a positive integer less than or equal to M;

[0133] The first operation unit can be used to calculate the wind speed based on the target wind speed range and the i-th preset K opt Control the operation of the wind turbine to obtain the wind turbine in the target wind speed range and the i-th preset K opt The corresponding Internet access power;

[0134] The switching unit can be used to switch the wind turbine generator system from the i-th preset K to the i-th preset K when the wind turbine generator system operating state meets the preset switching condition. opt Switch to j-th preset K opt , j is a positive integer less than or equal to M, and j is not equal to i;

[0135] The second operation unit can be used to calculate the wind speed based on the target wind speed interval and the jth preset K opt Control the operation of the wind turbine to obtain the wind turbine in the target wind speed range and the jth preset K opt The corresponding Internet power.

[0136] In some embodiments, the switching unit may include:

[0137] Get subunit, which can be used to get K opt The preset rate of change of

[0138] The switching subunit can be used to change from the i-th preset K based on the preset change rate opt Switch to jth preset K opt .

[0139] In some embodiments, the wind turbine blade tip speed ratio determination device 500 may further include:

[0140] The variable acquisition module can be used to obtain the values ​​of preset variables during the operation of the wind turbine according to a preset cycle. The preset variables include wind speed, rotation speed, and grid power.

[0141] The calculation module can be used to calculate the average value of the value of the preset variable within a preset period, update the value of the preset variable based on the average value, and count the cumulative number of the average value;

[0142] The first acquisition unit can be used to return to obtain the i-th preset K value when the cumulative number of average values ​​does not meet the preset optimization stop condition. opt ;

[0143] The control module can be used to stop obtaining the i-th preset K when the cumulative number of average values ​​meets the preset optimization stop condition. opt .

[0144] In some embodiments, the preset optimization stop condition includes at least one of the following:

[0145] The cumulative number of average values ​​in each target wind speed interval is greater than or equal to a first preset number;

[0146] The cumulative sum of the average values ​​in all target wind speed intervals is greater than or equal to a second preset number.

[0147] In some embodiments, the control module may include:

[0148] The second acquisition unit may be used to acquire the wind speed average value in each average value of the preset variable in each target wind speed interval;

[0149] The division unit can be used to divide the wind speed interval based on the average value of all wind speeds;

[0150] The first determining unit may be configured to determine the divided wind speed interval as a target wind speed interval.

[0151] In some embodiments, the wind turbine blade tip speed ratio determination device 500 may further include:

[0152] A third acquisition unit may be used to acquire a rotation speed average value in each average value of a preset variable in each target wind speed interval;

[0153] The first selection unit may be used to select a target speed average value belonging to a preset speed range from all speed average values;

[0154] A fourth acquisition unit may be used to acquire a target online power corresponding to an average value of a target rotation speed;

[0155] The second selection unit can be used to select the target K corresponding to the maximum value of the target online power opt ;

[0156] The third determination module 550 may include:

[0157] The second determination unit can be used to determine the target K opt Determine the target tip speed ratio of the wind turbine.

[0158] In some embodiments, the wind turbine blade tip speed ratio determination device 500 may further include:

[0159] A fifth acquisition unit may be used to acquire air density;

[0160] The third determination module 550 may include:

[0161] The third determination unit can be used to determine the air density and the target K opt , determine the target tip speed ratio of the wind turbine.

[0162] The device for determining the tip speed ratio of a wind turbine set provided in the embodiment of the present application can be used to execute the method for determining the tip speed ratio of a wind turbine set provided in the above-mentioned method embodiments. Its specific implementation principles and technical effects are similar and will not be described herein for the sake of brevity.

[0163] Based on the same inventive concept, the embodiment of the present application also provides a main controller, such as Figure 6 As shown, the main controller may include a processor 601 and a memory 602 storing computer program instructions.

[0164] Specifically, the processor 601 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiment of the present invention.

[0165] The memory 602 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 602 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. In appropriate cases, the memory 602 may include a removable or non-removable (or fixed) medium. In appropriate cases, the memory 602 may be inside or outside the integrated gateway disaster recovery device. In a specific embodiment, the memory 602 is a non-volatile solid-state memory. In a specific embodiment, the memory 602 includes a read-only memory (ROM). In appropriate cases, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM) or a flash memory or a combination of two or more of these.

[0166] The processor 601 reads and executes the computer program instructions stored in the memory 602 to implement any one of the methods for determining the tip speed ratio of the wind turbine in the above embodiments.

[0167] In one example, the main controller may further include a communication interface 603 and a bus 610. Figure 6 As shown, the processor 601, the memory 602, and the communication interface 603 are connected via a bus 610 and communicate with each other.

[0168] The communication interface 603 is mainly used to implement the communication between the modules, devices, units and / or devices in the embodiment of the present invention.

[0169] Bus 610 includes hardware, software or both, and the components of the main controller are coupled to each other. For example, but not limitation, the bus may include accelerated graphics port (AGP) or other graphics bus, enhanced industrial standard architecture (EISA) bus, front side bus (FSB), hypertransport (HT) interconnection, industrial standard architecture (ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnection (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. In appropriate cases, bus 610 may include one or more buses. Although the embodiment of the present invention describes and shows a specific bus, the present invention considers any suitable bus or interconnection.

[0170] The main controller can execute the method for determining the tip speed ratio of the wind turbine in the embodiment of the present invention, thereby achieving Figures 1 to 5 A method and device for determining the tip speed ratio of a wind turbine are described.

[0171] In addition, in combination with the method for determining the tip speed ratio of a wind turbine in the above embodiment, an embodiment of the present invention may provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer program instructions; when the computer program instructions are executed by a processor, any method for determining the tip speed ratio of a wind turbine in the above embodiment is implemented.

[0172] It should be clear that the present invention is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present invention.

[0173] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present invention are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0174] It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or in a different order from the embodiments, or several steps can be performed simultaneously.

[0175] The above is only a specific implementation of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the system, module and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be covered within the protection scope of the present invention.

Claims

1. A method for determining the tip speed ratio of a wind turbine, characterized in that: include: Get the target wind speed range and M preset optimal gain coefficients K opt , where M is a positive integer greater than 1; Based on the target wind speed interval and the M preset K opt , the wind turbine generator set is within the target wind speed range, and the M preset K opt The corresponding Internet access power is as follows; Determine the maximum Internet access power among all the Internet access powers; The preset K corresponding to the maximum online power opt Determined as target K opt ; According to the target K opt Determining a target tip speed ratio of the wind turbine generator set; The method further comprises: in the step of: opt In the process of controlling the operation of the wind turbine generator set, the values ​​of preset variables in the operation of the wind turbine generator set are obtained according to a preset period, and the preset variables include wind speed, rotation speed, and grid power; The method of stopping the method based on the target wind speed interval and the M preset K opt After controlling the wind turbine generator set to operate, obtaining a rotation speed average value in each average value of the preset variables in the target wind speed interval; Selecting a target speed average value belonging to a preset speed range from among all the speed average values; Obtaining a target online power corresponding to the target rotation speed average value; Select the preset K corresponding to the maximum value of the target online power opt , as the target K opt .

2. The method according to claim 1, characterized in that The method based on the target wind speed interval and the M preset K opt , the wind turbine generator set is within the target wind speed range, and the M preset K opt The corresponding online power is as follows: Get the i-th preset K opt , i is a positive integer less than or equal to M; Based on the target wind speed interval and the i-th preset K opt Control the operation of the wind turbine to obtain the wind turbine in the target wind speed range and the i-th preset K opt The corresponding Internet access power; When the wind turbine operating state meets the preset switching condition, the i-th preset K opt Switch to jth preset K opt , j is a positive integer less than or equal to M, and j is not equal to i; Based on the target wind speed interval and the j-th preset K opt Control the operation of the wind turbine generator set to obtain the wind turbine generator set in the target wind speed range and the jth preset K opt The corresponding Internet power.

3. The method according to claim 2, characterized in that The i-th preset K opt Switch to jth preset K opt Previously, it also included: Get K opt The preset rate of change of The i-th preset K opt Switch to jth preset K opt ,include: Based on the preset change rate, the i-th preset K opt Switch to the jth preset K opt .

4. The method according to claim 2, characterized in that: In the method based on the target wind speed interval and the i-th preset K opt The process of controlling the operation of wind turbines also includes: Acquire values ​​of preset variables during the operation of the wind turbine generator set according to a preset cycle, wherein the preset variables include wind speed, rotation speed, and grid-connected power; Calculating an average value of the values ​​of the preset variable within the preset period, updating the value of the preset variable based on the average value, and counting the cumulative number of the average value; In the step of obtaining the wind turbine generator system in the target wind speed interval and the i-th preset K opt After the corresponding Internet access power is calculated, it also includes: If the cumulative number of the average value does not meet the preset optimization stop condition, return to obtain the i-th preset K opt ; When the cumulative number of the average values ​​meets the preset optimization stop condition, stop obtaining the i-th preset K opt .

5. The method according to claim 4, characterized in that The preset optimization stopping condition includes at least one of the following: The cumulative number of the average values ​​in each of the target wind speed intervals is greater than or equal to a first preset number; The cumulative sum of the average values ​​in all the target wind speed intervals is greater than or equal to a second preset number.

6. The method according to claim 5, characterized in that When the cumulative number of the average values ​​meets the preset optimization stop condition, stop obtaining the i-th preset K opt After that, it also includes: Obtaining a wind speed average value from each average value of a preset variable in each target wind speed interval; Dividing the wind speed intervals based on the average values ​​of all the wind speeds; The divided wind speed interval is determined as the target wind speed interval.

7. The method according to any one of claims 1 to 6, characterized in that: According to the target K opt Before determining the target tip speed ratio of the wind turbine generator set, the method further includes: Get the air density; According to the target K opt Determining a target tip speed ratio of the wind turbine generator system includes: According to the air density and the target K opt , determine the target tip speed ratio of the wind turbine generator set.

8. A device for determining the tip speed ratio of a wind turbine, characterized in that: include: The acquisition module is used to obtain the target wind speed range and M preset optimal gain coefficients K opt , where M is a positive integer greater than 1; A power acquisition module is used to obtain a power based on the target wind speed interval and the M preset K opt , the wind turbine generator set is within the target wind speed range, and the M preset K opt The corresponding Internet access power is as follows; A first determining module, used to determine the maximum Internet access power among all the Internet access powers; The second determination module is used to determine the preset K corresponding to the maximum online power opt Determined as target K opt ; The third determination module is used to determine the target K opt Determining a target tip speed ratio of the wind turbine generator set; The variable acquisition module is used to obtain the variable based on the target wind speed interval and the M preset K opt In the process of controlling the operation of the wind turbine generator set, the values ​​of preset variables in the operation of the wind turbine generator set are obtained according to a preset period, and the preset variables include wind speed, rotation speed, and grid power; A third acquisition unit, configured to acquire a rotation speed average value in each average value of a preset variable in the target wind speed interval; A first selection unit is used to select a target speed average value belonging to a preset speed range from all speed average values; A fourth acquisition unit, configured to acquire a target online power corresponding to the target rotation speed average value; The second selection unit is used to select the preset K corresponding to the maximum value of the target online power. opt , as the target K opt .

9. A main controller, characterized in that: The main controller includes: a processor, and a memory storing computer program instructions; The processor reads and executes the computer program instructions to implement the method for determining the tip speed ratio of a wind turbine set according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the method for determining the tip speed ratio of a wind turbine set according to any one of claims 1 to 7 is implemented.

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