CN114673630A

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

Info

Publication number: CN114673630A
Application number: CN202011552744.6A
Authority: CN
Inventors: 吕金桥; 王瑞
Original assignee: Xinjiang Goldwind Science and Technology Co Ltd
Current assignee: Xinjiang Goldwind Science and Technology Co Ltd
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2022-06-28

Abstract

The application discloses a method, a device and a main controller for determining a speed ratio of a wind turbine blade tip. The method for determining the tip speed ratio of the wind turbine generator comprises the following steps: obtaining a target wind speed interval and M preset optimal gain coefficients K_optM is a positive integer greater than 1; based on target wind speed interval and M preset Ks_optObtaining M preset Ks of the wind turbine generator in the target wind speed interval_optRespectively corresponding internet access power; determining the maximum internet power in all the internet powers; presetting K corresponding to maximum internet power_optIs determined as target K_opt(ii) a According to the target K_optAnd determining a target tip speed ratio of the wind turbine generator. By the method for determining the tip speed ratio of the wind turbine generator, the target K can be determined_optThe determined target tip speed ratio is more excellent, and therefore the generated energy of the wind turbine generator can be effectively improved.

Description

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

Technical Field

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

Background

The tip speed ratio is used as an important parameter for representing the characteristics of the wind turbine, and the value of the tip speed ratio influences the generated energy of the wind turbine, so that the setting of the optimal tip speed ratio is very important.

At this stage, the Optimal gain factor (K) is usually set empirically by the skilled person_opt) Is the most important ofAnd the optimal value realizes the setting of the optimal value of the tip speed ratio, and the wind turbine generator is controlled to operate based on the optimal value of the tip speed ratio. However, since this approach depends on the experience level of the technician, the set tip speed ratio may not be optimal, resulting in a lower power generation of the wind turbine.

Disclosure of Invention

The embodiment of the application aims to provide a method, a device and a main controller for determining a tip speed ratio of a wind turbine generator, so as to solve the technical problem that the generated energy of the wind turbine generator is low due to the fact that the set tip speed ratio is possibly not optimal in the prior art.

The technical scheme of the application is as follows:

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

obtaining a target wind speed interval and M preset optimal gain coefficients K_optM is a positive integer greater than 1;

based on target wind speed interval and M preset Ks_optObtaining M preset Ks of the wind turbine generator in a target wind speed interval_optRespectively corresponding internet access power;

determining the maximum internet power in all the internet powers;

presetting K corresponding to maximum internet power_optIs determined as a target K_opt；

According to the target K_optAnd determining the target tip speed ratio of the wind turbine generator.

In a second aspect, an apparatus for determining a tip speed ratio of a wind turbine may include:

an obtaining module for obtaining a target wind speed interval and M preset optimal gain coefficients K_optM is a positive integer greater than 1;

a power acquisition module for acquiring power based on the target wind speed interval and M preset Ks_optObtaining M preset Ks of the wind turbine generator in a target wind speed interval_optRespectively corresponding internet power is set;

the first determining module is used for determining the maximum internet power in all the internet powers;

a second determining module for presetting K corresponding to the maximum internet power_optIs determined as a target K_opt；

A third determination module for determining K according to the target_optAnd determining a target tip speed ratio of the wind turbine generator.

In a third aspect, a master controller is provided, which may include:

a processor;

a memory for storing the processor-executable instructions;

wherein the processor is configured to execute the instructions to implement the method of determining a wind turbine tip speed ratio as shown in any embodiment of the first aspect.

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

The technical scheme provided by the embodiment of the application at least has the following beneficial effects:

according to the embodiment of the application, the target wind speed interval and M preset optimal gain coefficients K are obtained_optBased on the target wind speed interval and M preset Ks_optObtaining M preset Ks of the wind turbine generator in the target wind speed interval_optThe corresponding internet power is set, and then the target K corresponding to the maximum internet power in all the internet powers is set_optA target tip speed ratio is determined. Thus, according to the target K corresponding to the maximum internet access power_optDetermining the target tip speed ratio, independent of the experience of the technician, allows the target K to be selected_optPreferably so that according to the target K_optThe determined target tip speed ratio is more excellent, and therefore the generated energy of the wind turbine generator 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 restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application and are not to be construed as limiting the application.

Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present application;

FIG. 2 is a schematic flow chart of a method for determining a tip speed ratio of a wind turbine generator according to an embodiment of the present disclosure;

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

FIG. 4 is a graph comparing power curves provided by embodiments of the present application;

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

fig. 6 is a schematic structural diagram of a master controller according to an embodiment of the present application.

Detailed Description

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

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences 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. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

As is known in the art, K is set empirically_optThe optimal value of the blade tip speed ratio of the wind turbine generator is set, so that the setting of the blade tip speed ratio depends on the experience level of technicians and can be guidedThe set tip speed ratio may not be optimal, and the generated energy of the wind turbine generator is low.

Based on the technical problem, the application provides a method, a device and a main controller for determining the tip speed ratio of a wind turbine generator, which can obtain a target wind speed interval and M preset optimal gain coefficients K_optBased on the target wind speed interval and M preset Ks_optObtaining M preset Ks of the wind turbine generator in the target wind speed interval_optAnd respectively corresponding internet access power. Then according to the target K corresponding to the maximum internet power in all the internet powers_optA target tip speed ratio is determined. Thus, according to the target K corresponding to the maximum internet access power_optDetermining the target tip speed ratio, independent of the experience of the technician, allows the target K to be selected_optMore preferably, so that according to the target K_optThe determined target tip speed ratio is more excellent, and therefore the generated energy of the wind turbine generator can be effectively improved.

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

Fig. 1 shows a schematic diagram of an application scenario provided in an embodiment of the present application. The application scenario may include wind turbines 110 and a main controller 120 of a wind farm, and each wind farm may include a plurality of wind turbines 110. It is understood that three wind turbines 110 are schematically shown in fig. 1, and in practice, the number of wind turbines 110 may be greater or smaller.

The wind turbine 110 may include components such as a foundation, a tower, a nacelle, a hub, blades, and the like. The foundation can be used as a foundation of the wind turbine generator 110 to keep the wind turbine generator 110 stable. The tower may be used to raise the wind center (e.g., blades) of the wind turbine 110 to a height. The nacelle is a cabin body which can be used for accommodating and protecting a main shaft of a wind turbine, a gear box, a generator and other transmission systems and other electrical equipment, and can be generally made of glass fiber reinforced plastics with light dead weight, high strength and corrosion resistance. The hub can be used for fixing the blades, is a base for installing the blades and can transmit mechanical energy converted by the blades to the main shaft. The blades are mounted on the hub and can convert wind energy into mechanical energy.

The wind turbine 110 is communicatively connected to a master controller 120 of the wind farm. Thus, the main controller 120 of the wind farm can obtain the wind speed, the rotation speed, the power on the grid and the like of the wind turbine generator 110, and can preset K based on M preset K target wind speed intervals_optDetermining M preset Ks of the wind turbine generator within a target wind speed interval_optThe maximum internet access power in the respective corresponding internet access power is preset K according to the maximum internet access power_optAnd determining a target tip speed ratio of the wind turbine generator.

The method for determining the tip speed ratio of the wind turbine generator provided by the embodiment of the application is described in detail below.

Fig. 2 is a schematic flow chart of a method for determining a tip speed ratio of a wind turbine provided in an embodiment of the present application, where the method for determining the tip speed ratio of the 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 the wind turbine provided by the embodiment of the present application may include the following steps:

s210, obtaining a target wind speed interval and M preset optimal gain coefficients K_opt。

Wherein M is an integer greater than 1.

K_optFor the optimal gain factor, this factor can be used to determine the generator torque of the wind turbine (which influences the grid power of the wind turbine). K_optRelated to factors such as blade radius, optimum tip speed ratio, wind energy utilization coefficient, air density, and more specifically, K_optCan be as follows:

K_opt＝(πρR⁵C_pλopt)/(2λopt³G³) (1)

where ρ is the air density, R is the blade radius, C_pFor the coefficient of wind energy utilization, λ opt is the optimum tip speed ratio, C_pλ opt is the wind energy capture coefficient (maximum wind energy capture coefficient) at the time of optimum tip speed ratio operation, and G is the gearbox speed ratio.

In this embodiment, K is preset_optMay be of a value ofA multiple of the theoretical optimum set empirically.

The target wind speed interval may be a wind speed interval divided in advance, one or more target wind speed intervals may be used as the target wind speed interval, and the number of the target wind speed intervals and the specific wind speed range of each target wind speed interval are preset before the method for determining the tip speed ratio of the wind turbine generator provided in this embodiment is executed.

As an example, the target wind speed interval and M preset optimal gain coefficients K set in advance may be obtained first_opt。

As a specific example, K is preset_optCan be a multiple of a theoretical optimal value set according to experience, taking M as 7 as an example, and 7 preset K_optCan be as shown in Table 1, where K is shown in Table 1_opt1 represents the first K_opt，K _opt2 denotes the 2 nd K_opt… …, each value of the multiple value row represents a preset K corresponding to the multiple value_optQuotient of theoretical optimum, i.e. preset K for each multiple value_optShould be the product of the multiplier value and the theoretical optimum, e.g. K _opt1 is 0.8 times the theoretical optimum value, K _opt2 is 0.85 times the theoretical optimum.

TABLE 1

K_opt	K_opt1	K_opt2	K_opt3	K_opt4	K_opt5	K_opt6	K _opt7
								Multiple number	0.8	0.85	0.9	0.95	1.0	1.05	1.1

S220, based on the target wind speed interval and M preset Ks_optObtaining M preset Ks of the wind turbine generator in the target wind speed interval_optAnd respectively corresponding internet access power.

The power on line refers to the difference between the generated power of the wind turbine and the consumption of the wind turbine.

In the acquired target wind speed interval and M preset K_optThereafter, each preset K may be based on the target wind speed interval and the aforementioned_optControlling the wind turbine generator to operate to obtain that each preset K is within a target wind speed interval_optAnd respectively corresponding internet access power. M is still 7, M is preset K_optAre each K _opt1、K _opt2、K_opt3、K _opt4、K _opt5、K _opt6、K _opt7, may be based on the target wind speed interval and K _opt1, controlling the fan unit to operate to obtain K of the wind turbine generator set in the target wind speed interval _opt1, corresponding power of surfing the Internet, and based on the target wind speed interval and K _opt2, controlling the fan set to operate to obtain K of the wind turbine generator set in the target wind speed interval _opt2, sequentially executing the corresponding internet surfing powers until the wind turbine generator is on the targetEach preset K in the interval of the standard wind speed_optAnd (5) the corresponding internet access power.

It can be understood that, when there are a plurality of target wind speed intervals, the target wind speed intervals may be sequentially based on each target wind speed interval and M preset K_optControlling the wind turbine generator to operate to obtain each preset K within each target wind speed interval of the wind turbine generator_optAnd respectively corresponding internet power. Presetting K, wherein the number of the target wind speed intervals is 3, namely a wind speed interval 1, a wind speed interval 2 and a wind speed interval 3_optIs 4, are respectively K_opt1、K _opt2、K_opt3、K _opt4 for example, may be based on wind speed intervals 1 and K, respectively_opt1. Wind speed interval 1 and K _opt2. Wind speed interval 1 and K_opt3. Wind speed intervals 1 and K _opt4. Wind speed interval 2 and K _opt1. Wind speed interval 2 and K _opt2. Wind speed interval 2 and K_opt3. Wind speed interval 2 and K _opt4. Wind speed intervals 3 and K _opt1. Wind speed intervals 3 and K _opt2. Wind speed intervals 3 and K_opt3. Wind speed intervals 3 and K _opt4, controlling the wind turbine generator to operate to obtain K in the wind speed interval 1_opt1、K _opt2、K_opt3、K _opt4 corresponding power of surfing the net and K in the interval of wind speed 2_opt1、K _opt2、K_opt3、K _opt4 corresponding power of surfing the net and within 3 wind speed intervals of K _opt1、K _opt2、K_opt3、K _opt4, the respective corresponding internet access power.

And S230, determining the maximum internet power in all the internet powers.

M preset Ks are obtained within the target wind speed interval of the wind turbine generator_optAfter the respective corresponding internet surfing powers are obtained, the internet surfing power with the largest value, namely the maximum internet surfing power, can be selected from all the internet surfing powers corresponding to the target wind speed interval. If the internet surfing powers in the target wind speed interval can be sequenced, the maximum internet surfing power in the target wind speed interval is obtained.

It can be understood that, when a plurality of target wind speed intervals are provided, the maximum on-grid power of all the on-grid powers corresponding to each target wind speed interval may be determined respectively.

S240, presetting K corresponding to the maximum internet power_optIs determined as a target K_opt。

After the maximum internet surfing power of all internet surfing powers in the target wind speed interval is determined, the preset K corresponding to the maximum internet surfing power can be determined_optI.e. target K_opt。

It can be understood that, when there are a plurality of target wind speed intervals, the target K corresponding to the maximum power on grid in each target wind speed interval may be determined respectively_opt. As shown in Table 2, Table 2 shows the target K for each target wind speed interval, taking 11 target wind speed intervals as an example_optIn which a is K_optThe theoretical optimum value of (1).

TABLE 2

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

S250, according to the target K_optAnd determining a target tip speed ratio of the wind turbine generator.

As an example, the target K corresponding to the maximum internet power is determined_optThereafter, the target K can be determined_optAnd determining the tip speed ratio of the wind turbine generator in the target wind speed interval, namely the target tip speed ratio. Due to the object K_optIs a preset K corresponding to the maximum on-line power in the target wind speed interval_optSo based on the target K_optThe determined target tip speed ratio also corresponds to the maximum power on line, and the generated energy of the wind turbine generator which runs in the target wind speed interval based on the target tip speed ratio is relatively high.

It is understood that, when the target wind speed interval is plural, it may be based on the target K of each wind speed interval_optA target tip speed ratio for each wind speed interval is determined. Since each target K_optIs a preset K corresponding to the maximum power of the on-line in each target wind speed interval_optSo based on each target K of each target wind speed interval_optThe determined target tip speed ratio also corresponds to the maximum power on line in the target wind speed interval, and the generated energy of the wind turbine generator which operates in the corresponding target wind speed interval based on each target tip speed ratio is relatively high.

According to the embodiment of the application, the target wind speed interval and M preset optimal gain coefficients K are obtained_optBased on the target wind speed interval and M preset Ks_optObtaining M preset Ks of the wind turbine generator in the target wind speed interval_optAnd respectively corresponding internet access power. Then according to the target K corresponding to the maximum internet power in all the internet powers_optA target tip speed ratio is determined. Thus, according to the target K corresponding to the maximum internet access power_optDetermining the target tip speed ratio, independent of the experience of the technician, allows the target K to be selected_optPreferably so that according to the target K_optThe determined target tip speed ratio is more excellent, and therefore the generated energy of the wind turbine generator can be effectively improved.

Moreover, different target tip speed ratios may correspond to different wind speed intervals, so when a plurality of target wind speed intervals are provided, the target tip speed ratio corresponding to each target wind speed interval is determined. Therefore, the determined target tip speed ratio can be further optimized, and the generated energy of the wind turbine generator can be further improved.

In some embodiments, K may be preset at the target wind speed interval and at the current time of the wind turbine_optWhen the running state meets the preset switching condition, switching to the next preset K_optAccordingly, the specific implementation manner of the step S220 may be as follows:

obtaining the ith preset K_opt. Wherein i is a positive integer less than or equal to M;

based on the target wind speed interval and the ith preset K_optControlling the wind turbine generator to operate to obtain the target wind speed interval of the wind turbine generator and the ith preset K_optLower corresponding internet access power;

under the condition that the running state of the wind turbine generator meets the preset switching condition, the ith preset K is used_optSwitch to jth preset K_opt. Wherein j is a positive integer less than or equal to M, and j is not equal to i;

presetting K based on target wind speed interval and jth_optControlling the wind turbine generator to operate to obtain the target wind speed interval and the jth preset K of the wind turbine generator_optAnd (5) the corresponding internet access power.

Wherein the preset switching condition may be a preset K_optThe switching condition of (a) may be, for example, that the wind turbine runs for a preset time period under a preset condition, and when the switching condition is met, the current preset K may be used_optSwitch to next preset K_opt. The preset switching condition may be that the accumulated effective operation of the wind turbine generator is greater than or equal to a preset time length. The effective operation refers to the operation of the wind turbine generator under the conditions of grid connection, non-full power generation, non-limited power and non-yaw. The wind turbine generator grid connection means that the wind turbine generator is connected into a power grid; the non-full power generation means that the running power of a generator of the wind turbine generator set is smaller than that of the generator; the unlimited power means that the active power of the wind turbine generator is not limited by the regulation or the reason of the wind turbine generator; non-yaw means that the course of the wind turbine generator does not change with the wind direction.

As an example, the ith preset K may be obtained first_optAnd controlling the wind turbine generator set based on the target wind speed interval and the ith preset K_optIn operation, i is less than or equal to a positive integer of M. Presetting K based on target wind speed interval and ith at wind turbine generator_optIn the operation process, the online power of the wind turbine generator can be obtained, and the target wind speed interval of the wind turbine generator and the ith preset K are obtained_optAnd (5) the corresponding internet access power. Controlling the wind turbine generator based on the target wind speed interval and the ith preset K_optIn the operation process, whether the operation state of the wind turbine generator meets the preset switching condition or not can be detected.

Under the condition that the running state of the wind turbine generator meets the preset switching condition, the ith preset K can be controlled_optSwitch to jth preset K_optWherein j is a positive integer less than or equal to M, and j is not equal to i. Controlling the wind turbine generator based on the target wind speed interval and the jth preset K_optOperating in the interval of the wind turbine based on the target wind speedAnd jth preset K_optIn the operation process, the online power of the wind turbine generator can be obtained, and the target wind speed interval of the wind turbine generator and the jth preset K are obtained_optAnd (5) the corresponding internet access power. And controlling the wind turbine generator set based on the target wind speed interval and the jth preset K_optIn the operation process, whether the operation state of the wind turbine generator meets the preset switching condition or not is detected, and under the condition that the operation state of the wind turbine generator meets the preset switching condition, the jth preset K is used_optSwitch to next preset K_opt. Therefore, each preset K is set until the wind turbine generator is within the target wind speed interval_optAnd respectively corresponding internet access power.

It will be appreciated that the above is based on the target wind speed interval and M preset K_optObtaining M preset Ks of the wind turbine generator in the target wind speed interval_optThe specific implementation process of the respective corresponding internet power is specific to one target wind speed interval, and when the target wind speed intervals are multiple, the implementation process is executed for each wind speed interval, so that M preset Ks of the wind turbine generator set in each wind speed interval can be obtained_optAnd respectively corresponding internet access power. Then, preset K is performed_optDuring switching, the switching can be carried out in sequence or out of sequence as long as the switching of the same preset K is not repeated_optAnd can poll all preset Ks_optAnd (4) finishing.

Thus, under the condition that the preset switching condition is met, switching is carried out to the next preset K_optThe effectiveness of the obtained internet power can be ensured, and the target K is determined_optA more accurate data basis is provided, so that the accuracy of the determined target tip speed ratio can be further improved, and the target K is further determined_optThe determined target tip speed ratio is better, and the generated energy of the wind turbine generator is improved.

In some embodiments, K can be preset at a preset rate of change_optThe specific implementation manner of the handover may be as follows:

obtaining K_optA preset rate of change;

based on a preset rate of change fromi preset K_optSwitch to jth preset K_opt。

As an example, K is preset_optBefore switching, a preset change rate may be obtained, where the preset change rate may be a preset switching slope, and for example, the preset change rate may be: theoretical optimum K_optValue/5000.0. Then, from the ith preset K can be controlled according to the preset change rate_optSwitch to jth preset K_opt. Thus, K is preset according to a preset change rate_optSwitching, avoiding direct switching from a preset K_optSwitch to next preset K_optAnd in time, the wind turbine generator jumps, so that the stability of the wind turbine generator can be improved.

In some embodiments, the accumulated number of the average values of the preset variables may be obtained in the process of controlling the wind turbine generator to operate, and the method may return to execute the obtaining of the ith preset K when the accumulated number of the average values does not meet the preset optimization stop condition_optAccordingly, the specific implementation manner thereof may be as follows:

acquiring numerical values of preset variables in the operation process of the wind turbine generator according to a preset period, wherein the preset variables comprise wind speed, rotating speed and internet power;

and calculating the average value of the numerical values of the preset variables in the preset period, updating the numerical values of the preset variables based on the average value, and counting the accumulated number of the average value.

The preset period may be a preset period for acquiring preset variables of the wind turbine, for example, 10 seconds.

At the moment, the target wind speed interval and the ith preset K of the wind turbine generator are obtained_optAfter the corresponding internet power is lower, the following steps can be executed:

under the condition that the accumulated number of the average values does not meet the preset optimizing stop condition, the ith preset K is obtained_opt；

Stopping obtaining the ith preset K under the condition that the accumulated number of the average values meets the preset optimizing stop condition_opt。

The preset optimization stopping 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 conditions:

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

and the sum of the accumulated number of the average values in all the target wind speed intervals is greater than or equal to a second preset number.

The first preset number is a minimum allowable value of the accumulated number of the average values of the preset single target wind speed intervals, such as 300, 400, 500, and the like; the second preset number is a minimum allowable value of the accumulated number of the average values of all the preset target wind speed intervals, and may be, for example, 50000, 55000, 60000, and the like.

As an example, the target wind speed interval and the ith preset K are used as the basis of the wind turbine generator_optIn the operation process, the numerical value of a preset variable in the operation process of the wind turbine generator can be obtained according to a preset period, and the preset variable can comprise wind speed, rotating speed and internet power. Then, an average value of the preset variables in the preset period may be calculated, the average value of the preset variables may be updated based on the average value, and the accumulated number of the average values may be counted. Taking the example that the preset period is 10 seconds, the average value of the preset variables in the previous preset period (namely 9:59:50-10:00:00) after 10:00:00 updating is the wind speed average value 0, the rotating speed average value 0 and the internet power average value 0, and the accumulated number of the average values from the current operation to 10:00:00 is 100, assuming that the average value of the preset variables in the operation process of the wind turbine generator in the current preset period (namely 10:00:00-10:00:10) obtained by 10:00:10 is the wind speed average value 1, the rotating speed average value 1 and the internet power average value 1, the average value of the preset variables can be updated to be the wind speed average value 1, the rotating speed average value 1 and the internet power average value 1, and the accumulated number of the average values from the current operation to 10:00:00 can be updated to be 101.

At the moment, the target wind speed interval and the ith preset K of the wind turbine generator are obtained_optAfter the corresponding internet power is lowered, whether the accumulated number of the average values meets the preset optimizing stop condition or not can be judged.

Specifically, when the target wind speed interval is one, the preset optimization stop condition may be an accumulated number of average values in the target wind speed interval, which is greater than or equal to a first preset number. When the cumulative number of the average values in the target wind speed interval is greater than or equal to the first preset number, the cumulative number of the average values in the target wind speed interval may be considered to satisfy the preset optimization stop condition, and the obtaining of the ith preset K may be stopped_optI.e. no longer go back to execute the acquisition of the ith preset K_optBased on the target wind speed interval and M preset K_optControlling the wind turbine generator to operate to obtain M preset Ks of the wind turbine generator in a target wind speed interval_optAnd downloading the corresponding internet surfing power. When the cumulative number of the average values in the target wind speed interval is smaller than the first preset number, the cumulative number of the average values in the target wind speed interval is considered not to satisfy the preset optimization stop condition, and the method returns to the embodiment of the method for obtaining the ith preset K_optBased on the target wind speed interval and M preset K_optControlling the wind turbine generator to operate to obtain M preset Ks of the wind turbine generator in a target wind speed interval_optAnd respectively corresponding internet access power.

When the target wind speed interval is multiple, the preset optimization stop condition may be: the accumulated number of the averages in each target wind speed interval is greater than or equal to a first preset number, and the sum of the accumulated number of the averages in all the 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 averages in each target wind speed interval is greater than or equal to a first preset number, or the sum of the cumulative number of averages in all target wind speed intervals is greater than or equal to a second preset number. When the target wind speed interval is multiple, the specific implementation manner of determining whether the accumulated number of the average values meets the preset optimization stop condition is similar to the specific processing procedure when the target wind speed interval is one, and details are not repeated here.

In this way, when the preset optimizing stop condition is not satisfied, the method returns to the step of acquiring the ith preset K_optBased on the target wind speed interval and M preset K_optControlling the wind turbine generator to operate to obtain M preset Ks of the wind turbine generator in a target wind speed interval_optAnd respectively corresponding internet access power. Thus, can be the target K_optProvides a more adequate data base.

In some embodiments, in the case that the accumulated number of the average values satisfies the preset optimization stop condition, the obtaining of the ith preset K is stopped_optAfterwards, the wind speed interval can be further subdivided, and the specific implementation manner can be as follows:

acquiring a wind speed average value in each average value of preset variables of each target wind speed interval;

dividing wind speed intervals based on all wind speed average values;

and determining the divided wind speed interval as a target wind speed interval.

As an example, consider a wind speed interval based on a target and a preset K_optThe wind speed at the time of operation may not coincide with the previously divided target wind speed interval. Therefore, under the condition that the accumulated number of the average values meets the preset optimizing stop condition, the acquisition of the ith preset K is stopped_optThen, the wind speed average value in each average value of the preset variables of each target wind speed interval can be obtained, the wind speed intervals are re-divided according to all the wind speed average values, and the divided wind speed intervals can be determined as the target wind speed intervals, that is, the divided wind speed intervals are updated to the target wind speed intervals. Therefore, the target wind speed interval is obtained according to the wind speed obtained in the actual operation, and the target wind speed interval can better accord with the actual operation.

In some embodiments, the maximum value of the internet surfing power corresponding to all the average values of the rotating speeds belonging to the preset rotating speed interval may be determined as the target K_optAccordingly, the specific implementation manner thereof may be as follows:

acquiring a rotating speed average value in each average value of preset variables of each target wind speed interval;

selecting a target rotating speed average value belonging to a preset rotating speed interval from all rotating speed average values;

acquiring target internet surfing power corresponding to the target rotating speed average value;

selecting a target K corresponding to the maximum value in the target internet access power_opt；

According to the target K_optAnd determining a target tip speed ratio of the wind turbine generator.

The preset rotation speed interval can be a rotation speed interval of main action of the wind turbine generator determined according to the minimum rotation speed and the rated rotation speed of the wind turbine generator, namely, the preset K is_optFor example, the main action interval of (2) may be 0.3rpm greater than the minimum rotation speed and less than 1.0rpm less than the rated rotation speed.

As an example, in the case where the accumulated number of averages satisfies the preset seek stop condition, the acquisition of the ith preset K is stopped_optThereafter, the average value of the rotation speed in each average value of all the preset variables for each target wind speed interval may be obtained. Then, the average of the rotation speeds belonging to the preset rotation speed interval, i.e. the target average of the rotation speeds, may be selected from all the aforementioned average of the rotation speeds, and the target average of the rotation speeds is usually multiple. After the target rotation speed average value is selected, the internet power corresponding to each target rotation speed average value, that is, the target internet power, can be determined. Then selecting the maximum value from all the target internet power, and determining the preset K corresponding to the maximum value in all the target internet power_optIs a target K_optBased on the target K_optAnd determining a target tip speed ratio of the wind turbine generator.

As a specific example, K may also be preset_optBy the speed of rotation and a predetermined K_optFitting a quadratic curve, as shown in FIG. 3, with the abscissa as the rotation speed value and the ordinate as K_optThe value is obtained. When the rotating speed is less than the lower limit demarcation point of the preset rotating speed interval, taking the K corresponding to the lower limit demarcation point of the preset rotating speed interval_optA value; when the rotating speed is greater than the upper limit dividing point of the preset rotating speed interval, taking K corresponding to the upper limit dividing point of the preset rotating speed interval_optThe value is obtained.

As shown in FIG. 4, FIG. 4 illustrates K before optimization_optAnd the target K after optimization by the method provided by the embodiment of the application_optResulting power curveIn the graph of fig. 4, the abscissa represents the wind speed, the left ordinate represents the power, and the right ordinate represents the power ratio. Therefore, the target K optimized by the method provided by the embodiment of the application_optRelative to K before optimization_optThe power generation amount is improved by 1.3165% according to the theoretical optimal value.

In this way, K corresponding to the maximum value in the target rotation speed average value belonging to the main action rotation speed interval of the wind turbine generator_optIs determined as a target K_optAccording to the target K_optA target tip speed ratio is determined. Therefore, on one hand, the target tip speed ratio determined based on the target rotating speed average value in the main acting rotating speed interval of the wind turbine generator can better meet the actual requirement. On the other hand, the average rotating speed value which does not belong to the main action interval of the wind turbine is filtered, so that the calculated amount can be reduced to a certain extent, and the efficiency of the method for determining the tip speed ratio of the wind turbine is improved.

It will be appreciated that the target K is derived in addition to the above-mentioned average value based on the preset variable_optBesides the method, the target K can be obtained by other modes such as linear interpolation and the like_opt。

In some embodiments, the target tip speed ratio may be determined in conjunction with air density, and accordingly specific implementations thereof may be as follows:

acquiring air density;

according to air density and target K_optAnd determining the target tip speed ratio of the wind turbine generator.

As one example, the air density may be obtained first, and then based on the air density and the target K_optAnd determining the target tip speed ratio of the wind turbine generator. The target tip speed ratio may be calculated, for example, by the following equation:

K_opt＝(ρ·π·R⁵·C_P)/(2·TSR) (2)

where ρ is the air density, R is the blade radius, C_PThe tip speed ratio is the ratio of the tip linear velocity to the wind speed, and the TSR is the tip speed ratio.

Therefore, the target tip speed ratio is determined by combining 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 generated energy of the wind turbine generator is further improved.

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

the obtaining module 510 may be configured to obtain a target wind speed interval and M preset optimal gain coefficients K_optM is a positive integer greater than 1;

a power obtaining module 520, configured to obtain a target wind speed interval and M preset Ks_optObtaining M preset Ks of the wind turbine generator in the target wind speed interval_optRespectively corresponding internet access power;

a first determining module 530, configured to determine a maximum internet power of all internet powers;

the second determining module 540 may be configured to determine a preset K corresponding to the maximum internet power_optIs determined as a target K_opt；

A third determining module 550 for determining K according to the target_optAnd determining a target tip speed ratio of the wind turbine generator.

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

a first obtaining unit for obtaining the ith preset K_optI is a positive integer less than or equal to M;

a first operation unit operable to preset K based on the target wind speed interval and the ith_optControlling the wind turbine generator to operate to obtain the target wind speed interval and the ith preset K of the wind turbine generator_optLower corresponding internet access power;

the switching unit can be used for presetting K by the ith under the condition that the running state of the wind turbine generator meets the preset switching condition_optSwitch to jth preset K_optJ is a positive integer less than or equal to M, and j is not equal to i;

a second operation unit for presetting K based on the target wind speed interval and the jth_optControlling the wind turbine generator to operate to obtain the target wind turbine generatorThe interval of the standard wind speed and the jth preset K_optAnd (5) the corresponding internet access power.

In some embodiments, the switching unit may include:

an acquisition subunit operable to acquire K_optA preset rate of change;

a switching subunit operable to switch from the ith preset K based on a preset rate of change_optSwitch to jth preset K_opt。

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

the variable acquisition module can be used for acquiring numerical values of preset variables in the operation process of the wind turbine generator according to a preset period, wherein the preset variables comprise wind speed, rotating speed and internet power;

the calculation module can be used for calculating the average value of the numerical values of the preset variables in the preset period, updating the numerical values of the preset variables based on the average value, and counting the accumulated number of the average value;

the first obtaining unit may be configured to, when the accumulated number of the average values does not satisfy the preset optimization stop condition, return to obtain the ith preset K_opt；

The control module can be used for stopping obtaining the ith preset K under the condition that the accumulated number of the average values meets the preset optimizing stop condition_opt。

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

In some embodiments, the control module may include:

a second obtaining unit, configured to obtain a wind speed average value of each average value of preset variables of each target wind speed interval;

a division unit which may be used to divide the wind speed interval based on all wind speed averages;

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

a third obtaining unit, configured to obtain a rotation speed average value of each average value of preset variables of each target wind speed interval;

the first selection unit can be used for selecting a target rotating speed average value belonging to a preset rotating speed interval from all rotating speed average values;

the fourth obtaining unit may be configured to obtain a target internet access power corresponding to the target rotation speed average value;

a second selecting unit, configured to select a target K corresponding to a maximum value of the target internet power_opt；

The third determining module 550 may include:

a second determination unit operable to determine K according to the target_optAnd determining a target tip speed ratio of the wind turbine generator.

a fifth acquiring unit, which can be used for acquiring the air density;

the third determining module 550 may include:

a third determination unit operable to determine a target K based on the air density_optAnd determining the target tip speed ratio of the wind turbine generator.

The device for determining the tip speed ratio of the wind turbine generator provided by the embodiment of the application can be used for executing the method for determining the tip speed ratio of the wind turbine generator provided by the embodiments of the methods, the specific implementation principle and the technical effect are similar, and for the sake of brevity, the details are not repeated herein.

Based on the same inventive concept, the present application also provides a main controller, as shown in fig. 6, which may include a processor 601 and a memory 602 storing computer program instructions.

Specifically, the processor 601 may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or may be configured as one or more Integrated circuits implementing 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), floppy Disk Drive, flash memory, optical Disk, magneto-optical Disk, tape, or Universal Serial Bus (USB) Drive or a combination of two or more of these. Memory 602 may include removable or non-removable (or fixed) media, where appropriate. The memory 602 may be internal or external to the integrated gateway disaster recovery device, where appropriate. In a particular embodiment, the memory 602 is a non-volatile solid-state memory. In a particular embodiment, the memory 602 includes Read Only Memory (ROM). Where appropriate, the ROM may be 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 these.

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

In one example, the host controller may also include a communication interface 603 and a bus 610. As shown in fig. 6, the processor 601, the memory 602, and the communication interface 603 are connected via a bus 610 to complete communication therebetween.

The communication interface 603 is mainly used for implementing communication between modules, devices, units and/or devices in the embodiment of the present invention.

Bus 610 includes hardware, software, or both to couple the components of the host controller to each other. By way of example, and not limitation, a bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hypertransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an infiniband interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a video electronics standards association local (VLB) bus, or other suitable bus or a combination of two or more of these. Bus 610 may include one or more buses, where appropriate. Although specific buses have been described and shown in the embodiments of the invention, any suitable buses or interconnects are contemplated by the invention.

The main controller may execute the method for determining the speed ratio of the wind turbine blade tip in the embodiment of the present invention, so as to implement the method and the apparatus for determining the speed ratio of the wind turbine blade tip described in fig. 1 to 5.

In addition, in combination with the method for determining the tip speed ratio of the wind turbine generator in the above embodiment, an embodiment of the present invention may provide a computer-readable storage medium to implement the method. The computer readable storage medium having stored thereon computer program instructions; when executed by a processor, the computer program instructions implement any one of the methods for determining the tip speed ratio of a wind turbine generator in the above embodiments.

It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the 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, plug-in, function card, or the like. When implemented in software, the elements of the invention are the 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 by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium 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 so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.

It should also be noted that the exemplary embodiments mentioned in this patent 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-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.

As described above, only the specific embodiments of the present invention are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.

Claims

1. A method for determining a tip speed ratio of a wind turbine generator is characterized by comprising the following steps:

based on the target wind speed interval and the M preset Ks_optAnd obtaining M preset Ks of the wind turbine generator set in the target wind speed interval_optRespectively corresponding internet access power;

determining the maximum internet power in all the internet powers;

presetting K corresponding to the maximum internet power_optIs determined as a target K_opt；

2. The method of claim 1, wherein the target wind speed interval is based on the M preset Ks and the target wind speed interval_optAnd obtaining M preset Ks of the wind turbine generator set in the target wind speed interval_optThe following respective corresponding internet access powers include:

obtaining the ith preset K_optWherein i is a positive integer less than or equal to M;

based on the target wind speed interval and the ith preset K_optControlling the wind turbine generator to operate to obtain the target wind speed interval and the ith preset K of the wind turbine generator_optLower corresponding internet access power;

under the condition that the running state of the wind turbine generator meets the preset switching condition, the ith preset K_optSwitch to jth preset K_optJ 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 jth preset K_optControlling the wind turbine generator to operate to obtain the target wind speed interval and the jth preset K of the wind turbine generator_optAnd (5) the corresponding internet access power.

3. The method of claim 2, wherein K is preset by the ith_optSwitch to jth preset K_optBefore, still include:

obtaining K_optA preset rate of change;

the ith preset K_optSwitch to jth preset K_optThe method comprises the following steps:

from the ith preset K based on the preset rate of change_optSwitching to the jth preset K_opt。

4. The method of claim 2, wherein the target wind speed zone is based onBetween and said ith preset K_optIn the process of controlling the operation of the wind turbine generator, the method further comprises the following steps:

acquiring numerical values of preset variables in the running process of the wind turbine generator according to a preset period, wherein the preset variables comprise wind speed, rotating speed and internet power;

calculating the average value of the numerical values of the preset variables in the preset period, updating the numerical values of the preset variables based on the average value, and counting the accumulated number of the average value;

obtaining the target wind speed interval and the ith preset K of the wind turbine generator_optAfter the lower corresponding internet power, the method further comprises:

under the condition that the accumulated number of the average values does not meet the preset optimizing stop condition, returning to obtain the ith preset K_opt；

Stopping obtaining the ith preset K under the condition that the accumulated number of the average values meets a preset optimizing stop condition_opt。

5. The method of claim 4, wherein the preset optimization stop condition comprises at least one of:

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

6. The method according to claim 5, wherein the obtaining of the ith preset K is stopped when the accumulated number of the average values meets a preset optimization stop condition_optThen, the method further comprises the following steps:

dividing wind speed intervals based on all the wind speed average values;

7. The method according to claim 5, wherein the obtaining of the ith preset K is stopped when the accumulated number of the average values meets a preset optimization stop condition_optThen, the method further comprises the following steps:

selecting a target rotating speed average value belonging to a preset rotating speed interval from all the rotating speed average values;

selecting a target K corresponding to the maximum value in the target internet surfing power_opt；

8. The method according to any one of claims 1-7, wherein said target K is based on_optBefore determining the target tip speed ratio of the wind turbine generator, the method further comprises the following steps:

acquiring air density;

said according to said target K_optDetermining a target tip speed ratio of the wind turbine generator, comprising:

according to the air density and the target K_optAnd determining the target tip speed ratio of the wind turbine generator.

9. A wind turbine generator tip speed ratio determination device is characterized by comprising:

a power acquisition module for acquiring the power of the wind turbine based on the target wind speed interval and the M preset Ks_optAnd obtaining M preset Ks of the wind turbine generator set in the target wind speed interval_optRespectively corresponding internet access power;

a second determining module, configured to determine a preset K corresponding to the maximum internet power_optIs determined as a target K_opt；

A third determining module for determining the target K according to_optAnd determining a target tip speed ratio of the wind turbine generator.

10. A master controller, comprising: 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 as claimed in any one of claims 1 to 8.

11. A computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the method of determining a tip speed ratio of a wind turbine generator as claimed in any one of claims 1 to 8.