CN114673630A - Method and device for determining speed ratio of blade tip of wind turbine generator and main controller - Google Patents

Abstract

The present application discloses a method, a device and a main controller for determining the blade tip speed ratio of a wind turbine. The method for determining the tip speed ratio of the wind turbine includes: obtaining a target wind speed interval and M preset optimal gain coefficients K _opt , where M is a positive integer greater than 1; and obtaining wind power based on the target wind speed interval and M preset K _opt . Within the target wind speed range, the unit's corresponding on-grid power under M preset K _opt ; determine the maximum on-grid power among all on-grid powers; determine the preset K _opt corresponding to the maximum on-grid power as the target K _opt ; according to the target K _opt Determine the target tip speed ratio of the wind turbine. Using the method for determining the tip speed ratio of a wind turbine provided by the present application can make the target tip speed ratio determined according to the target K _opt more optimal, thereby effectively improving the power generation of the wind turbine.

Description

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

technical field

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

Background technique

As a very important parameter representing the characteristics of the wind turbine, the tip speed ratio will affect the power generation of the wind turbine. Therefore, it is particularly important to set the optimal tip speed ratio.

At this stage, technicians usually set the optimal value of the optimal gain coefficient (Optimal gain, K _opt ) according to experience to realize the setting of the optimal value of the tip speed ratio, and control the wind turbine based on the optimal value of the tip speed ratio. run. However, since this method depends on the experience level of technicians, the set tip speed ratio may not be optimal, resulting in lower power generation of the wind turbine.

SUMMARY OF THE INVENTION

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, so as to solve the problem that in the prior art, since the set tip speed ratio may not be optimal, the power generation of the wind turbine may be caused by low-volume technical issues.

The technical solution of this application is as follows:

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

Obtain the target wind speed interval 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 corresponding on-grid powers of the wind turbines under the M preset K _opt in the target wind speed interval are obtained;

Determine the maximum on-grid power among all on-grid power;

Determine the preset K _opt corresponding to the maximum online power as the target K _opt ;

The target tip speed ratio of the wind turbine is determined according to the target K _opt .

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

an acquisition module, configured to acquire a target wind speed interval and M preset optimal gain coefficients K _opt , where M is a positive integer greater than 1;

a power acquisition module, configured to obtain, based on the target wind speed interval and the M preset K _opt , the respective on-grid powers of the wind turbines corresponding to the M preset K _opt within the target wind speed interval;

The first determining module is used to determine the maximum online power among all the online powers;

The second determination module is used to determine the preset K _opt corresponding to the maximum online power as the target K _opt ;

The third determination module is configured to determine the target tip speed ratio of the wind turbine according to the target K _opt .

In a third aspect, a main controller is provided, and the main controller may include:

processor;

a memory for storing the processor-executable instructions;

Wherein, the processor is configured to execute the instructions to implement the method for determining a tip speed ratio of a wind turbine as shown in any one of the embodiments of the first aspect.

A fourth aspect provides a computer-readable storage medium, where computer program instructions are stored on the computer-readable storage medium, and when the computer program instructions are executed by a processor, the wind power as shown in any one of the embodiments of the first aspect is implemented. The method of determining the blade tip speed ratio of the unit.

The technical solutions provided by the embodiments of the present application bring at least the following beneficial effects:

In the embodiment of the present application, by acquiring the target wind speed interval and M preset optimal gain coefficients K _opt , and based on the target wind speed interval and the M preset K _opt , it is obtained that the wind turbines are within the target wind speed interval and under the M preset K _opt , respectively. Corresponding on-grid power, and then determine the target tip speed ratio according to the target K _opt corresponding to the maximum on-grid power among all on-grid powers. In this way, the target tip speed ratio is determined according to the target K _opt corresponding to the maximum online power, and no longer depends on the experience of the technicians, so that the selected target K _opt can be more optimal, so that the target tip speed determined according to the target K _opt The ratio is better, and then the power generation of the wind turbine can be effectively improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not limiting of the present application.

Description of drawings

The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the description, serve to explain the principles of the present application, and do not constitute an improper limitation of the present application.

1 is a schematic diagram of an application scenario provided by an embodiment of the present application;

2 is a schematic flowchart of a method for determining a tip speed ratio of a wind turbine provided by an embodiment of the present application;

3 is a schematic diagram of a quadratic curve fitting provided by an embodiment of the present application;

Fig. 4 is a kind of power curve comparison diagram provided by the embodiment of the present application;

5 is a schematic structural diagram of a device for determining a tip speed ratio of a wind turbine provided by an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a main controller provided by an embodiment of the present application.

Detailed ways

In order to make those skilled in the art better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings.

It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that data so used may be interchanged under appropriate circumstances so that the embodiments of the application described herein can be practiced in sequences other than those illustrated or described herein. The implementations described in the illustrative examples below are not intended to represent all implementations consistent with this application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as recited in the appended claims.

According to the background art, setting the optimal value of K _opt based on experience to realize the setting of the optimal value of the tip speed ratio of the wind turbine will cause the setting of the tip speed ratio to depend on the experience level of the technicians, which will lead to the setting of the tip speed ratio. The speed ratio may not be optimal, resulting in lower power generation from the wind turbine.

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 interval and M preset optimal gain coefficients K _opt , M preset K _opt , to obtain the corresponding on-grid power of the wind turbine under the M preset K _opt in the target wind speed range. Then, the target tip speed ratio is determined according to the target K _opt corresponding to the maximum on-grid power among all on-grid powers. In this way, the target tip speed ratio is determined according to the target K _opt corresponding to the maximum online power, and no longer depends on the experience of the technicians, so that the selected target K _opt can be more optimal, so that the target tip speed determined according to the target K _opt The ratio is better, and then the power generation of the wind turbine can be effectively improved.

The method for determining the tip speed ratio of a wind turbine provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios.

FIG. 1 shows a schematic diagram of an application scenario provided by an embodiment of the present application. The application scenario may include the wind turbines 110 and the main controller 120 of the wind farm, and each wind farm may include multiple wind turbines 110 . It can be understood that, FIG. 1 only schematically depicts three wind turbines 110 , and in practice, the number of wind turbines 110 may be more or less.

Wind turbine 110 may include foundations, towers, nacelles, hubs, blades, and the like. The foundation can be used 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 (eg, the blades) of the wind turbine 110 to a certain height. The engine room is a cabin that can be used to accommodate and protect the main shaft, gearbox, generator and other transmission systems and other electrical equipment of the wind turbine. The hub can be used to fix the blade and is the basis for installing the blade, which can transmit the mechanical energy converted by the blade to the main shaft. The blades are mounted on the hub and convert wind energy into mechanical energy.

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, rotational speed, grid power, etc. of the wind turbine 110, and can determine that the wind turbine is within the target wind speed interval based on the target wind speed interval and the M preset K _opt , and the M preset K The maximum on-grid power among the corresponding on-grid powers under _opt , and the target tip speed ratio of the wind turbine is determined according to the preset K _opt corresponding to the maximum on-grid power.

The method for determining the tip speed ratio of the wind turbine provided by the embodiments of the present application will be described in detail below.

FIG. 2 shows a schematic flowchart of a method for determining a tip speed ratio of a wind turbine provided by an embodiment of the present application. The method for determining a tip speed ratio of a wind turbine may be executed by a main controller of a wind farm. As shown in FIG. 2 , the method for determining the tip speed ratio of a wind turbine provided by the embodiment of the present application may include the following steps:

S210: Obtain the target wind speed interval and M preset optimal gain coefficients K _opt .

Wherein, M is an integer greater than 1.

K _opt is the optimal gain coefficient, which can be used to determine the generator torque of the wind turbine (the generator torque will affect the on-grid power of the wind turbine). K _opt is related to the blade radius, optimal tip speed ratio, wind energy utilization coefficient, air density and other factors. Specifically, K _opt can be:

K _opt =(πρR ⁵ C _p λopt)/(2λopt ³ G ³ ) (1)

Among them, 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 the optimal tip speed ratio is running, G is the gear ratio.

In this embodiment, the value of the preset K _opt may be a multiple of a theoretical optimal value set according to experience.

The target wind speed interval can be a pre-divided wind speed interval, and the target wind speed interval can 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 the wind power provided by this embodiment. The method for determining the blade tip speed ratio of the unit is preset beforehand.

As an example, the target wind speed interval and the preset M preset optimal gain coefficients K _opt may be obtained first.

As a specific example, the preset K _opt may be a multiple of the theoretical optimal value set according to experience. Taking M as 7 as an example, the settings of the seven preset K _opt may be as 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 of the multiple value row represents the quotient of the preset K _opt corresponding to the multiple value and the theoretical optimal value, that is, each multiple The preset K _opt corresponding to the value should be the product of the multiple value and the theoretical optimum value, for example, K _opt 1 is 0.8 times the theoretical optimum value, and K _opt 2 is 0.85 times the theoretical optimum value.

Table 1

K_opt K_opt1 K_opt2 K_opt3 K_opt4 K_opt5 K_opt6 K_opt7 multiple value 0.8 0.85 0.9 0.95 1.0 1.05 1.1

S220 , based on the target wind speed interval and the M preset K _opt , obtain the corresponding on-grid power of the wind turbine under the M preset K _opt in the target wind speed interval.

Among them, the on-grid power refers to the difference between the power generated by the wind turbine and the consumption of the wind turbine itself.

After the target wind speed interval and the M preset K _opt are obtained, the operation of the wind turbine can be controlled based on the target wind speed interval and each of the aforementioned preset K _opt , and it is obtained that within the target wind speed interval, the wind _turbines are Corresponding online power. Still taking M as 7 and the M preset K _opt as K _opt 1, K _opt 2, K _opt 3, K _opt 4, K _opt 5, K _opt 6, and K _opt 7 as an example, the target wind speed interval and K _opt 1 controls the operation of the wind turbine to obtain the corresponding on-grid power of the wind turbine in the target wind speed interval K _opt 1, and then controls the operation of the wind turbine based on the target wind speed interval and K _opt 2 to obtain the wind turbine in the target wind speed interval K The corresponding on-grid power under _opt 2 is executed sequentially until the on-grid power corresponding to each preset K _opt of the wind turbine within the target wind speed interval is obtained.

It can be understood that when there are multiple target wind speed intervals, the operation of the wind turbine can be controlled based on each target wind speed interval and the M preset K _opt in turn, so as to obtain the wind turbine in each target wind speed interval, each preset K opt. The corresponding online power under _opt . Taking the target wind speed interval as 3, namely wind speed interval 1, wind speed interval 2, and wind speed interval 3, the preset K _opt is 4, respectively K _opt 1, K _opt 2, K _opt 3, K _opt 4 as an example, may be based on wind speed bin 1 and K _opt 1, wind speed bin 1 and K _opt 2, wind speed bin 1 and K _opt 3, wind speed bin 1 and K _opt 4, wind speed bin 2 and K _opt 1, wind speed bin 2 and K _opt 2, respectively , wind speed range 2 and K _opt 3, wind speed range 2 and K _opt 4, wind speed range 3 and K _opt 1, wind speed range 3 and K _opt 2, wind speed range 3 and K _opt 3, wind speed range 3 and K _opt 4 to control wind power The unit is running to obtain the corresponding on-grid power of K _opt 1, K _opt 2, K _opt 3, and K _opt 4 in wind speed interval 1, and K _opt 1, K _opt 2, K _opt 3, and K _opt 4 in wind speed interval 2 respectively correspond to , the corresponding online power of K _opt 1, K _opt 2, K _opt 3, and K _opt 4 in the wind speed interval 3.

S230, determine the maximum online power among all the online powers.

After obtaining the corresponding on-grid power of the wind turbines in the target wind speed range under M preset K _opt , the on-grid power with the largest value can be selected from all on-grid powers corresponding to the target wind speed range, that is, the maximum on-grid power. For example, the grid power in the target wind speed range can be sorted to obtain the maximum grid power in the target wind speed range.

It can be understood that, when there are multiple target wind speed intervals, the maximum on-grid power among all on-grid powers corresponding to each target wind speed interval can be determined respectively.

S240, the preset K _opt corresponding to the maximum online power is determined as the target K _opt .

After the maximum on-grid power among all on-grid powers in the target wind speed interval is determined, the preset K _opt corresponding to the maximum on-grid power, that is, the target K _opt can be determined.

It can be understood that, when there are multiple target wind speed intervals, the target K _opt corresponding to the maximum on-grid power in each target wind speed interval can be determined respectively. As shown in Table 2, Table 2 takes 11 target wind speed intervals as an example, and shows a running result of the target K _opt for each target wind speed interval, where a is the theoretical optimal value of K _opt .

Table 2

target wind speed range 1 2 3 4 5 6 7 8 9 10 11 Goal K_opt 1.1a 1a 1a 1a 0.95a 0.8a 0.8a 0.85a 0.85a 0.85a 0.9a

S250, determining a target tip speed ratio of the wind turbine according to the target K _opt .

As an example, after the target K _opt corresponding to the maximum on-grid power is determined, the tip speed ratio of the wind turbine in the target wind speed interval, that is, the target tip speed ratio, may be determined according to the target K _opt . Since the target K _opt is the preset K _opt corresponding to the maximum on-grid power in the target wind speed interval, the target tip speed ratio determined based on the target K _opt also corresponds to the maximum on-grid power. Based on the target tip speed ratio in the target wind speed interval The generating capacity of the operating wind turbines is also relatively high.

It can be understood that, when there are multiple target wind speed intervals, the target tip speed ratio of each wind speed interval may be determined based on the target K _opt of each wind speed interval. Since each target K _opt is the preset K _opt corresponding to the maximum on-grid power in each target wind speed interval, the target tip speed ratio determined based on each target K _opt in each target wind speed interval, in the target wind speed interval It also corresponds to the maximum on-grid power. Based on each target tip speed ratio, the power generation of the wind turbine operating in the corresponding target wind speed range is also relatively high.

In the embodiment of the present application, by acquiring the target wind speed interval and M preset optimal gain coefficients K _opt , and based on the target wind speed interval and the M preset K _opt , it is obtained that the wind turbines are within the target wind speed interval and under the M preset K _opt , respectively. Corresponding online power. Then, the target tip speed ratio is determined according to the target K _opt corresponding to the maximum on-grid power among all on-grid powers. In this way, the target tip speed ratio is determined according to the target K _opt corresponding to the maximum online power, and no longer depends on the experience of the technicians, so that the selected target K _opt can be more optimal, so that the target tip speed determined according to the target K _opt The ratio is better, and then the power generation of the wind turbine can be effectively improved.

Moreover, since different wind speed intervals may correspond to different target 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 tip speed ratio can be further optimized, thereby further improving the power generation of the wind turbine.

In some embodiments, when the operating state of the wind turbine in the target wind speed interval and the current preset K _opt satisfies the preset switching condition, it may switch to the next preset K _opt , correspondingly, the specific implementation of the above step S220 Can be as follows:

Get the ith preset K _opt . Among them, i is a positive integer less than or equal to M;

Control the operation of the wind turbine based on the target wind speed interval and the i-th preset K _opt , and obtain the corresponding on-grid power of the wind turbine in the target wind speed interval and the i-th preset K _opt ;

In the case that the operating state of the wind turbine satisfies the preset switching condition, the ith preset K _opt is switched to the j th preset K _opt . Among them, j is a positive integer less than or equal to M, and j is not equal to i;

The operation of the wind turbine is controlled based on the target wind speed interval and the jth preset K _opt , and the corresponding on-grid power of the wind turbine in the target wind speed interval and the jth preset K _opt is obtained.

The preset switching condition may be a preset switching condition of the preset K _opt . For example, it may be that the wind turbine runs for a preset period of time under the preset condition. If the switching condition is satisfied, the current preset switching condition may be used. Set K _opt to switch to the next preset K _opt . For example, the preset switching condition may be that the cumulative effective operation of the wind turbine is greater than or equal to the preset duration. Among them, effective operation refers to the operation of wind turbines in grid-connected, non-full power, non-limited power, and non-yaw conditions. Grid-connected wind turbine means that the wind turbine is connected to the power grid; non-full power means that the operating power of the generator of the wind turbine is less than that of the generator; non-limited power means that the active power of the wind turbine is not restricted by dispatch or its own reasons; non-yaw means wind power The crew's heading does not change with the wind.

As an example, the ith preset K _opt may be obtained first, and the wind turbine is controlled to operate based on the target wind speed interval and the ith preset K _opt , where i is less than or equal to a positive integer of M. During the operation of the wind turbine based on the target wind speed interval and the i-th preset K _opt , the on-grid power of the wind turbine can be obtained, and the corresponding on-grid power of the wind turbine in the target wind speed interval and the i-th preset K _opt can be obtained. . In the process of controlling the wind turbine to operate based on the target wind speed interval and the i-th preset K _opt , it can also be detected whether the operating state of the wind turbine satisfies the preset switching condition.

In the case that the operating state of the wind turbine satisfies the preset switching condition, it can be controlled to switch from the ith preset K _opt to the j th preset K _opt , where j is a positive integer less than or equal to M, and j not equal to i. Control the wind turbine to run based on the target wind speed interval and the jth preset K _opt . During the operation of the wind turbine based on the target wind speed interval and the jth preset K _opt , the grid power of the wind turbine can be obtained, and the target wind turbine can be obtained. The wind speed interval and the corresponding online power under the jth preset K _opt . And in the process of controlling the wind turbine to operate based on the target wind speed interval and the jth preset K _opt , it is detected whether the operating state of the wind turbine satisfies the preset switching condition, and in the case that the operating state of the wind turbine satisfies the preset switching condition, Switch from the jth preset K _opt to the next preset K _opt . In this way, the corresponding on-grid power under each preset K _opt of the wind turbine within the target wind speed range is obtained.

It can be understood that, based on the target wind speed interval and the M preset K _opt , the specific implementation process of obtaining the corresponding on-grid power under the M preset K _opt of the wind turbine within the target wind speed interval 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, and the corresponding on-grid power of the wind turbine in each wind speed interval under M preset K _opt can be obtained. Moreover, when switching the preset K _opt , the switching may be performed in sequence or out of sequence, as long as the same preset K _opt is not repeatedly switched, and all the preset K _opt can be polled.

In this way, when the preset switching conditions are met, switching to the next preset K _opt can ensure the validity of the obtained online power, provide a more accurate data basis for determining the target K _opt , and further improve the determination of the target K opt . The accuracy of the target tip speed ratio further makes the target tip speed ratio determined according to the target K _opt better, and improves the power generation of the wind turbine.

In some embodiments, the preset K _opt switching may be performed according to the preset change rate, and the specific implementation manner may be as follows:

Get the preset rate of change of K _opt ;

Switching from the i-th preset K _opt to the j-th preset K _opt is based on the preset rate of change.

As an example, before switching the preset K _opt , a preset change rate may be obtained first, and the preset change rate may be a preset switching slope, such as: theoretical optimal K _opt value/5000.0. Then, it is possible to switch from the i-th preset K _opt to the j-th preset K _opt according to the preset rate of change control. In this way, switching the preset K _opt according to the preset rate of change can avoid jumping of the wind turbine when directly switching from one preset K _opt to the next preset K _opt , thereby improving the stability of the wind turbine.

In some embodiments, the accumulated number of average values of preset variables may be acquired during the control of the operation of the wind turbine, and if the accumulated number of average values does not meet the preset optimization stop condition, the process may return to execute the acquisition of the i-th A preset K _opt , correspondingly, its specific implementation can be as follows:

Obtain the value of the preset variables during the operation of the wind turbine according to the preset cycle, and the preset variables include wind speed, rotational speed, and grid power;

Calculate the average value of the value of the preset variable in the preset period, update the value of the preset variable based on the average value, and count the cumulative number of the average value.

Wherein, the preset period may be a preset period for acquiring preset variables of the wind turbine, such as 10 seconds.

At this time, after obtaining the corresponding on-grid power of the wind turbine in the target wind speed interval and the i-th preset K _opt , the following steps may also be performed:

In the case that the accumulated quantity of the average value does not meet the preset optimization stop condition, return to obtain the i-th preset K _opt ;

When the accumulated number of average values satisfies the preset optimization stop condition, the acquisition of the i-th preset K _opt is stopped.

Wherein, the preset optimization stop condition may be a preset condition for judging the end of optimization, and the preset optimization condition may include at least one of the following:

The cumulative number of average values in each target wind speed interval is greater than or equal to the first preset number;

The sum of the cumulative number of averages in all target wind speed intervals is greater than or equal to the second preset number.

Wherein, the first preset number is a preset minimum allowable value of the cumulative number of the average value of a single target wind speed interval, such as 300, 400, 500, etc.; the second preset number is all preset target wind speeds The minimum allowable value of the cumulative number of the average value of the interval, such as 50000, 55000, 60000, etc.

As an example, during the operation of the wind turbine based on the target wind speed interval and the i-th preset K _opt , the value of a preset variable during the operation of the wind turbine may also be obtained according to a preset period, and the preset variable may include: Wind speed, rotation speed, power on the Internet. Then, the average value of the preset variables in the preset period can be calculated, the average value of the preset variables can be updated based on the average value, and the accumulated number of the average values can be counted. Taking the preset period as 10 seconds, the average value of the preset variables in the last preset period after the update at 10:00:00 (ie, 9:59:50-10:00:00) is the average value of wind speed 0, the rotational speed The average value is 0, the average value of Internet access power is 0, and the cumulative number of average values from the start of this operation to 10:00:00 is 100. :00-10:00:10), the average values of the preset variables during the operation of the wind turbine are the average value of wind speed 1, average speed 1, and average power on the grid 1, then the average value of the preset variables can be calculated. It is updated to the average value of wind speed 1, the average value of rotational speed 1, the average value of online power 1, and the cumulative number of average values that can be updated from the start of this operation to 10:00:00 is 101.

At this time, after obtaining the corresponding on-grid power of the wind turbine in the target wind speed interval and the i-th preset K _opt , it can be determined whether the accumulated number of average values satisfies the preset optimization stop condition.

Specifically, when there is one target wind speed interval, the preset optimization stop condition may be the cumulative number of average values in the target wind speed interval, which 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 _opt , that is, do not return to the execution to obtain the i-th preset K _opt , so as to control the operation of the wind turbine based on the target wind speed interval and the M preset K _opt , and obtain that the wind turbine is within the target wind speed interval, M preset K opt Steps for the corresponding Internet access power under _opt . In the case where the accumulated number of average values in the target wind speed interval is less than the first preset number, it can be considered that the accumulated number of average values in the target wind speed interval does not meet the preset optimization stop condition, and the method returns to execute the method obtained in the embodiment above. The i-th preset K _opt step is to control the operation of the wind turbine based on the target wind speed interval and the M preset K _opt , and obtain the corresponding on-grid power of the wind turbine under the M preset K _opt in the target wind speed interval.

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 the first preset number, and the cumulative number of average values in all target wind speed intervals The sum of the numbers is greater than or equal to the 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 the 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 The second preset number. When there are multiple target wind speed intervals, the specific implementation method of judging whether the accumulated number of average values satisfies the preset optimization stop condition is similar to the specific processing process when the target wind speed interval is one, and will not be repeated here.

In this way, if the preset optimization stop condition is not met, return to the step of obtaining the i-th preset K _opt , control the operation of the wind turbine based on the target wind speed interval and the M preset K _opt , and obtain the target wind speed of the wind turbine. In the interval, the corresponding online power under the M preset K _opt . In this way, a more sufficient data basis can be provided for the determination of the target K _opt .

In some embodiments, in the case that the accumulated number of average values satisfies the preset optimization stop condition, after the acquisition of the i-th preset K _opt is stopped, the wind speed interval may be re-divided, and the specific implementation method may be as follows:

Obtain the average value of wind speed in each average value of preset variables for each target wind speed interval;

Divide the wind speed interval based on the average value of all wind speeds;

The divided wind speed interval is determined as the target wind speed interval.

As an example, considering the wind speed during operation based on the target wind speed interval and the preset K _opt , it may not be consistent with the pre-divided target wind speed interval. Therefore, in the case that the cumulative number of average values satisfies the preset optimization stop condition, after stopping the acquisition of the i-th preset K _opt , the average value of each average value of the preset variables in each target wind speed interval can be acquired. The average value of wind speed, and then re-divide the wind speed interval according to the average value of all wind speeds, 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 by dividing according to the wind speed obtained in the actual operation, which can make the target wind speed interval more in line with the actual operation.

In some embodiments, the maximum value of the online power corresponding to the average value of all rotational speeds belonging to the preset rotational speed range may be determined as the target K _opt , and correspondingly, the specific implementation manner may be as follows:

Obtain the average value of the rotational speed in each average value of the preset variables of each target wind speed interval;

Select the target speed average value belonging to the preset speed range among all speed average values;

Obtain the target online power corresponding to the average target speed;

Select the target K _opt corresponding to the maximum value in the target Internet access power;

The target tip speed ratio of the wind turbine is determined according to the target K _opt .

The preset rotational speed interval may be the rotational speed interval of the main function of the wind turbine determined according to the minimum rotational speed and the rated rotational speed of the wind turbine, that is, the main function interval of the preset K _opt , for example, it may be 0.3 rpm greater than the minimum rotational speed, and Less than the rated speed minus 1.0rpm.

As an example, in the case that the accumulated number of average values satisfies the preset optimization stop condition, after the acquisition of the i-th preset K _opt is stopped, each average value of all preset variables in each target wind speed interval may be acquired. average speed. Then, among all the above-mentioned average rotational speed values, an average rotational speed value belonging to a preset rotational speed interval, that is, an average value of target rotational speed may be selected, and there are usually multiple average average rotational speeds of the target rotational speed. After the average target rotational speed is selected, the Internet access power corresponding to each target rotational speed average value, that is, the target Internet access power can be determined. Then select the maximum value among all target on-grid powers, determine the preset K _opt corresponding to the maximum value of all target on-grid powers as the target K _opt , and then determine the target tip speed ratio of the wind turbine based on the target K _opt .

As a specific example, in the main action interval of the preset K _opt , the rotation speed and the preset K _opt can be used for quadratic curve fitting, as shown in Figure 3, the abscissa is the rotation speed value, and the ordinate is the K _opt value . When the rotational speed is less than the lower boundary of the preset rotational speed interval, the K _opt value corresponding to the lower boundary of the preset rotational speed interval is taken; when the rotational speed is greater than the upper boundary of the preset rotational speed interval, the K _opt value corresponding to the upper boundary of the preset rotational speed interval is taken. value.

As shown in FIG. 4 , FIG. 4 shows a power curve comparison diagram based on the theoretical optimal value of K _opt before optimization and the target K _opt after optimization by using the method provided in the embodiment of the present application. In FIG. 4 , the abscissa is the wind speed , the left ordinate is the power, and the right ordinate is the power ratio. It can be seen that the power generation is increased by 1.3165% compared to the theoretical optimum value of K _opt before optimization based on the optimized target K _opt using the method provided in the embodiment of the present application.

In this way, K _opt corresponding to the maximum value of the average target rotational speed in the main operating rotational speed interval of the wind turbine is determined as the target K _opt , and the target tip speed ratio is determined according to the target K _opt . In this way, on the one hand, the target tip speed ratio determined based on the average value of the target rotational speed in the main operating rotational speed range of the wind turbine will be more in line with the actual needs. On the other hand, filtering out the average speed of the wind turbine that does not belong to the main action 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.

It can be understood that, in addition to the above-mentioned method of obtaining the target K _opt based on the average value of the preset variables, the target K _opt can also be obtained by other methods such as linear interpolation.

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

get air density;

According to the air density and the target K _opt , the target tip speed ratio of the wind turbine is determined.

As an example, the air density may be obtained first, and then the target tip speed ratio of the wind turbine may be determined according to the air density and the target K _opt . For example, the target tip speed ratio can be calculated by the following formula:

K _opt =(ρ·π·R ⁵ ·C _P )/(2·TSR) (2)

Among them, 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 blade tip speed ratio.

In this way, the target tip speed ratio is determined in combination with the air density, and the influence of 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.

Based on the same inventive concept, the present application also provides a device for determining the tip speed ratio of a wind turbine. As shown in FIG. 5 , the present application also provides a device 500 for determining the tip speed ratio of a wind turbine, which may include:

The obtaining module 510 can be used to obtain the target wind speed interval and M preset optimal gain coefficients K _opt , where M is a positive integer greater than 1;

The power acquisition module 520 can be configured to obtain, based on the target wind speed interval and the M preset K _opt , the corresponding on-grid powers of the wind turbines under the M preset K _opt in the target wind speed interval;

The first determination module 530 can be used to determine the maximum online power among all the online power;

The second determination module 540 may be configured to determine the preset K _opt corresponding to the maximum online power as the target K _opt ;

The third determination module 550 may be configured to determine the target tip speed ratio of the wind turbine according to the target K _opt .

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

the first obtaining unit, which can be used to obtain the i-th preset K _opt , where i is a positive integer less than or equal to M;

The first operation unit can be used to control the operation of the wind turbine based on the target wind speed interval and the i-th preset K _opt , and obtain the corresponding on-grid power of the wind turbine in the target wind speed interval and the i-th preset K _opt ;

The switching unit can be used to switch from the ith preset K _opt to the j th preset K _opt when the operating state of the wind turbine meets the preset switching condition, where j is a positive integer less than or equal to M, and j not equal to i;

The second operation unit may be configured to control the operation of the wind turbine based on the target wind speed interval and the jth preset K _opt , and obtain the corresponding on-grid power of the wind turbine in the target wind speed interval and the jth preset K _opt .

In some embodiments, the switching unit may include:

Obtain the subunit, which can be used to obtain the preset rate of change of K _opt ;

The switching subunit may be used to switch from the ith preset K _opt to the j th preset K _opt based on the preset change rate.

In some embodiments, the device 500 for determining a tip speed ratio of a wind turbine may further include:

The variable acquisition module can be used to acquire the value of the preset variable during the operation of the wind turbine according to the preset period, and the preset variable includes the wind speed, the rotational speed, and the power on the grid;

The calculation module can be used to calculate the average value of the values of the preset variables in the preset period, update the values of the preset variables based on the average value, and count the cumulative number of the average values;

The above-mentioned first obtaining unit can be used to return to obtain the i-th preset K _opt when the accumulated number of the average value does not meet the preset optimization stop condition;

The control module can be configured to stop acquiring the i-th preset K _opt when the accumulated number of average values satisfies the preset optimization stop condition.

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

The cumulative number of average values in each target wind speed interval is greater than or equal to the first preset number;

The sum of the cumulative number of averages in all target wind speed intervals is greater than or equal to the second preset number.

In some embodiments, the control module may include:

The second obtaining unit can be used to obtain the average value of the wind speed in each average value of the preset variables of each target wind speed interval;

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

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

In some embodiments, the device 500 for determining a tip speed ratio of a wind turbine may further include:

a third obtaining unit, which can be used to obtain the average value of the rotational speed in each average value of the preset variables of each target wind speed interval;

the first selection unit, which can be used to select the average value of the target rotational speed that belongs to the preset rotational speed range among all the average rotational speed values;

a fourth obtaining unit, which can be used to obtain the target online power corresponding to the average value of the target rotational speed;

The second selection unit can be used to select the target K _opt corresponding to the maximum value in the target Internet access power;

The third determining module 550 may include:

The second determining unit may be configured to determine the target tip speed ratio of the wind turbine according to the target K _opt .

In some embodiments, the device 500 for determining a tip speed ratio of a wind turbine may further include:

the fifth obtaining unit, which can be used to obtain the air density;

The third determining module 550 may include:

The third determining unit may be configured to determine the target tip speed ratio of the wind turbine according to the air density and the target K _opt .

The device for determining the tip speed ratio of a wind turbine provided by the embodiments of the present application can be used to implement the methods for determining the tip speed ratio of a wind turbine provided by the above method embodiments. The specific implementation principles and technical effects are similar. For the sake of brevity, in This will not be repeated here.

Based on the same inventive concept, an embodiment of the present application further provides a main controller. As shown in FIG. 6 , the main controller may include a processor 601 and a memory 602 storing computer program instructions.

Specifically, the above-mentioned processor 601 may include a central processing unit (CPU), or a specific integrated circuit (Application Specific Integrated Circuit, ASIC), or may be configured to implement one or more integrated circuits in the embodiments of the present invention.

Memory 602 may include mass storage for data or instructions. By way of example and not limitation, memory 602 may include a Hard Disk Drive (HDD), a floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive or two or more A combination of more than one of the above. Memory 602 may include removable or non-removable (or fixed) media, where appropriate. Storage 602 may be internal or external to the integrated gateway disaster recovery device, where appropriate. In certain embodiments, memory 602 is non-volatile solid state memory. In particular embodiments, memory 602 includes read only memory (ROM). Where appropriate, the ROM may be a mask programmed ROM, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), electrically rewritable ROM (EAROM) or flash memory or A combination of two or more of the above.

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

In one example, the master controller may also include a communication interface 603 and a bus 610 . Among them, as shown in FIG. 6 , the processor 601 , the memory 602 , and the communication interface 603 are connected through the bus 610 and complete the mutual communication.

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

The bus 610 includes hardware, software, or both, coupling the components of the master controller to each other. By way of example and not limitation, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, Enhanced Industry Standard Architecture (EISA) bus, Front Side Bus (FSB), HyperTransport (HT) Interconnect, Industry Standard Architecture (ISA) Bus, Infiniband Interconnect, Low Pin Count (LPC) Bus, Memory Bus, Microchannel Architecture (MCA) Bus, Peripheral Component Interconnect (PCI) Bus, PCI-Express (PCI-X) Bus, Serial Advanced Technology Attachment (SATA) bus, Video Electronics Standards Association Local (VLB) bus or other suitable bus or a combination of two or more of the above. Bus 610 may include one or more buses, where appropriate. Although embodiments of the present invention describe and illustrate a particular bus, the present invention contemplates any suitable bus or interconnect.

The main controller may execute the method for determining the tip speed ratio of a wind turbine in the embodiment of the present invention, so as to realize the method and device for determining the tip speed ratio of a wind turbine described in FIGS. 1 to 5 .

In addition, in combination with the method for determining the tip speed ratio of the wind turbine in the above embodiments, the embodiments of the present invention may provide a computer-readable storage medium for implementation. Computer program instructions are stored on the computer-readable storage medium; when the computer program instructions are executed by the processor, any method for determining the tip speed ratio of a wind turbine in the foregoing embodiments is implemented.

It is to be understood that the present invention is not limited to the specific arrangements and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above-described 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 sequence of steps after comprehending the spirit of the present invention.

The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an application specific integrated circuit (ASIC), suitable firmware, a plug-in, a function card, or the like. When implemented in software, elements of the invention are programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted over a transmission medium or communication link by a data signal carried in a carrier wave. A "machine-readable medium" may include any medium that can store or transmit 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, fiber optic media, radio frequency (RF) links, and the like. The code segments may be downloaded via a computer network such as the Internet, an intranet, or the like.

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 may be performed in the order mentioned in the embodiment, or may be different from the order in the embodiment, or several steps may be performed simultaneously.

The above are only specific implementations of the present invention. Those skilled in the art can clearly understand that, for the convenience and brevity of the description, for the specific working process of the above-described systems, modules and units, reference may be made to the foregoing method embodiments. The corresponding process in , will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should all cover within the protection scope of the present invention.

Claims (11)

1. a determination method of wind turbine blade tip speed ratio, is characterized in that, comprises: obtaining the target wind speed interval 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 , obtain the corresponding on-grid power of the wind turbines under the M preset K _opt within the target wind speed interval; determining the maximum on-grid power among all the on-grid powers; Determining the preset K _opt corresponding to the maximum online power as the target K _opt ; The target tip speed ratio of the wind turbine is determined according to the target K _opt . 2 . The method according to claim 1 , wherein, based on the target wind speed interval and the M preset K _opt , it is obtained that the M preset wind turbines are within the target wind speed interval. 3 . The corresponding online power under K _opt , including: Obtain the i-th preset K _opt , where i is a positive integer less than or equal to the M; Control the operation of the wind turbine based on the target wind speed interval and the i-th preset K _opt , and obtain the corresponding on-grid power of the wind turbine in the target wind speed interval and the i-th preset K _opt ; In the case that the operating state of the wind turbine satisfies the preset switching condition, the ith preset K _opt is switched to the j th preset K _opt , where j is a positive integer less than or equal to the M, and all said j is not equal to said i; The operation of the wind turbine is controlled based on the target wind speed interval and the jth preset K _opt , and the corresponding on-grid power of the wind turbine in the target wind speed interval and the jth preset K _opt is obtained. 3. The method according to claim 2, wherein, before the switching from the i-th preset K _opt to the j-th preset K _opt , the method further comprises: Get the preset rate of change of K _opt ; The switching from the i-th preset K _opt to the j-th preset K _opt includes: Switching from the i-th preset K _opt to the j-th preset K _opt is based on the preset rate of change. 4. The method according to claim 2, wherein, in the process of controlling the operation of the wind turbine based on the target wind speed interval and the i-th preset K _opt , further comprising: Acquiring values of preset variables during the operation of the wind turbine according to a preset cycle, where the preset variables include wind speed, rotational speed, and grid power; Calculate the average value of the values of the preset variables in the preset period, update the values of the preset variables based on the average value, and count the cumulative number of the average values; After obtaining the corresponding on-grid power of the wind turbine in the target wind speed interval and the i-th preset K _opt , the method further includes: In the case that 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 accumulated number of the average values satisfies the preset optimization stop condition, the acquisition of the i-th preset K _opt is stopped. 5. The method according to claim 4, wherein the preset optimization stop condition comprises 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 sum of the cumulative quantities of the average values in all the target wind speed intervals is greater than or equal to a second preset quantity. 6. The method according to claim 5, characterized in that, after stopping the acquisition of the i-th preset K _opt under the condition that the cumulative number of the average value satisfies a preset optimization stop condition, further include: Obtain the average value of the wind speed in each average value of the preset variables in each of the target wind speed intervals; dividing wind speed intervals based on the average value of all said wind speeds; The divided wind speed interval is determined as the target wind speed interval. 7. The method according to claim 5, wherein, when the cumulative number of the average value satisfies a preset optimization stop condition, after stopping the acquisition of the i-th preset K _opt , further include: Obtain the average value of the rotational speed in each average value of the preset variables in each of the target wind speed intervals; Selecting the average target rotational speed that belongs to the preset rotational speed range among all the average rotational speed values; obtaining the target Internet access power corresponding to the average value of the target rotational speed; Select the target K _opt corresponding to the maximum value in the target Internet access power; The target tip speed ratio of the wind turbine is determined according to the target K _opt . 8. The method according to any one of claims 1-7, wherein before determining the target tip speed ratio of the wind turbine according to the target K _opt , the method further comprises: get air density; The determining of the target tip speed ratio of the wind turbine according to the target K _opt includes: Based on the air density and the target K _opt , a target tip speed ratio of the wind turbine is determined. 9. A device for determining the tip speed ratio of a wind turbine, comprising: an acquisition module, configured to acquire a target wind speed interval and M preset optimal gain coefficients K _opt , where M is a positive integer greater than 1; a power acquisition module, configured to obtain, based on the target wind speed interval and the M preset K _opt , the corresponding on-grid power of the wind turbine in the target wind speed interval and the M preset K _opt ; a first determining module, configured to determine the maximum on-grid power among all the on-grid powers; a second determination module, configured to determine the preset K _opt corresponding to the maximum online power as the target K _opt ; A third determination module, configured to determine a target tip speed ratio of the wind turbine according to the target K _opt . 10. A main controller, characterized in that the main controller comprises: a processor, and a memory storing computer program instructions; The processor reads and executes the computer program instructions to implement the method for determining a tip speed ratio of a wind turbine according to any one of claims 1-8. 11. A computer-readable storage medium, wherein computer program instructions are stored on the computer-readable storage medium, and when the computer program instructions are executed by a processor, any one of claims 1-8 is implemented. A method for determining the tip speed ratio of wind turbines.

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