CN113090453B - Control method and device of wind generating set and wind generating set - Google Patents

Abstract

The invention provides a control method and device of a wind generating set and the wind generating set. The control method comprises the following steps: dividing a wind speed range of the wind generating set before reaching a rated wind speed into a plurality of wind speed sections; aiming at each wind speed section, establishing a corresponding relation between theoretical maximum output power and a corresponding theoretical rotating speed and between actual maximum output power and a corresponding actual rotating speed in the wind speed section; acquiring real-time wind speed and real-time output power of a wind generating set, and determining a wind speed section where the real-time wind speed is located and the corresponding relation in the wind speed section; and determining a rotation speed increment according to the corresponding relation between the real-time output power and the wind speed section in which the real-time wind speed is positioned, and controlling the operation of the wind generating set according to the rotation speed increment. The control method can quickly and accurately track the maximum output power according to the change of the wind speed, so as to obtain the wind energy to the maximum extent.

Description

Wind generating set control method, device and wind generating set

technical field

The invention relates to the technical field of wind power generation, in particular to a control method and device for a wind power generating set and the wind power generating set.

Background technique

How to get the maximum wind energy under the condition of constant wind speed is the eternal pursuit of wind turbines. The goal of the Maximum Power Point Tracking (MPPT) control strategy applied to wind turbines is to make the speed of the wind rotor quickly track the change of wind speed, so that the wind turbines can always operate at the best tip speed ratio, so as to maximize Get wind power.

The existing MPPT control strategy has many problems, for example, it is greatly affected by the operating environment of the wind turbine, the accuracy of the maximum power point tracking is low, the maximum power point tracking time is too long, and the engineering application is difficult.

Contents of the invention

The purpose of the exemplary embodiments of the present invention is to provide a control method and device for a wind power generating set, and a wind power generating set, so as to overcome at least one of the aforementioned drawbacks.

In a general aspect, a control method for a wind power generating set is provided, the control method includes: dividing the wind speed range before the wind generating set reaches the rated wind speed into a plurality of wind speed segments; for each wind speed segment, establishing The corresponding relationship between the theoretical maximum output power and the corresponding theoretical rotational speed, the actual maximum output power and the corresponding actual rotational speed; obtain the real-time wind speed and real-time output power of the wind turbine, and determine the wind speed segment where the real-time wind speed is located and the corresponding wind speed segment within the wind speed segment relationship; according to the corresponding relationship between the real-time output power and the wind speed segment where the real-time wind speed is located, the rotational speed increment is determined, and the operation of the wind power generating set is controlled according to the rotational speed increment.

Optionally, for each wind speed segment, the step of establishing the corresponding relationship between the theoretical maximum output power in the wind speed segment and the corresponding theoretical rotational speed, and the actual maximum output power and the corresponding actual rotational speed includes: establishing the theoretical maximum output power in the wind speed segment A two-dimensional array whose first dimension is the power and the corresponding theoretical rotational speed and whose second dimension is the actual maximum output power and the corresponding actual rotational speed within the wind speed range.

Optionally, the step of determining the rotational speed increment includes: calculating the allowable power difference in the wind speed segment where the wind speed was at the previous moment according to the theoretical maximum output power and the actual maximum output power in the wind speed segment where the wind speed was at the previous moment; determining the current wind speed Whether the wind speed segment where the wind speed is located is the wind speed segment where the wind speed is at the previous moment; if the wind speed segment where the current wind speed is located is the wind speed segment where the wind speed is at the previous moment, then determine the theoretical maximum output power in the wind speed segment where the wind speed is at the previous moment. Whether the difference between the output power is less than the allowable power difference; if the difference between the theoretical maximum output power and the current output power is less than the allowable power difference, then determine that the rotational speed increment is zero; if the theoretical maximum output power and the current output If the power difference is not less than the allowable power difference, then the rotational speed increment is determined to be the difference between the theoretical rotational speed and the current rotational speed within the wind speed range where the wind speed was at the previous moment.

Optionally, the step of determining the rotational speed increment further includes: if the wind speed segment where the current wind speed is located is not the wind speed segment where the wind speed is located at the previous moment, then determining the rotational speed increment as the difference between the theoretical rotational speed in the wind speed segment where the current wind speed is located and the current rotational speed Difference.

Optionally, the allowable power difference in the wind speed segment where the wind speed is at the previous moment is half of the difference between the theoretical maximum output power and the actual maximum output power in the wind speed segment.

Optionally, the step of controlling the operation of the wind generating set according to the rotational speed increment includes: adjusting the real-time rotational speed of the wind generating set according to the rotational speed increment until the theoretical maximum output power in the wind speed segment where the wind speed is at the previous moment is equal to until the current output power difference is smaller than the allowable power difference.

Optionally, the control method further includes: obtaining the actual maximum output power and the corresponding actual rotational speed in each wind speed segment according to the historical operation data of the wind power generating set.

Optionally, the control method further includes: determining whether the current output power of the wind generating set is greater than the actual maximum output power in the wind speed segment where the current wind speed is located; if the current output power is greater than the actual maximum output power in the wind speed segment , then the corresponding relationship between the actual maximum output power and the corresponding actual rotational speed in the wind speed segment is updated to the corresponding relationship between the current output power and the current rotational speed.

In another general aspect, there is provided a control device for a wind power generating set, the control device comprising: a wind speed segment division unit configured to divide the wind speed range before the wind generating set reaches the rated wind speed into a plurality of wind speed segments; the corresponding relationship The establishment unit is configured to, for each wind speed segment, establish the corresponding relationship between the theoretical maximum output power and the corresponding theoretical rotational speed, the actual maximum output power and the corresponding actual rotational speed in the wind speed segment; the data acquisition unit is configured to obtain the wind power generating set The real-time wind speed and real-time output power; the rotation speed increment determination unit is configured to determine the wind speed segment where the real-time wind speed is located and the corresponding relationship in the wind speed segment, according to the real-time output power and the wind speed segment where the real-time wind speed is located. The corresponding relationship is to determine the rotation speed increment; the control unit is configured to control the operation of the wind power generating set according to the rotation speed increment.

Optionally, the correspondence establishment unit is further configured to: for each wind speed segment, establish the theoretical maximum output power in the wind speed segment and the corresponding theoretical rotational speed as the first dimension and the actual maximum output power in the wind speed segment and the The corresponding actual speed is a two-dimensional array with the second dimension.

Optionally, the rotation speed increment determination unit is further configured to: calculate the allowable power difference in the wind speed range where the wind speed is located at the previous moment according to the theoretical maximum output power and the actual maximum output power in the wind speed range where the wind speed is located at the previous moment; determine Whether the wind speed segment where the current wind speed is located is the wind speed segment where the wind speed was at the previous moment; if the wind speed segment where the current wind speed is located is the wind speed segment where the wind speed was at the previous moment, then determine the theoretical maximum output power in the wind speed segment where the wind speed was at the previous moment Whether the difference with the current output power is less than the allowable power difference; if the difference between the theoretical maximum output power and the current output power is less than the allowable power difference, then determine that the rotational speed increment is zero; if the theoretical maximum output power and If the current output power difference is not less than the allowable power difference, then the rotational speed increment is determined to be the difference between the theoretical rotational speed and the current rotational speed within the wind speed segment where the wind speed is at the previous moment.

Optionally, the rotational speed increment determination unit is further configured to: if the wind speed segment where the current wind speed is located is not the wind speed segment where the wind speed is located at the previous moment, then determine the rotational speed increment as the theoretical rotational speed and the current rotational speed within the wind speed segment where the current wind speed is located Difference.

Optionally, the rotational speed increment determination unit is further configured to: calculate one-half of the difference between the theoretical maximum output power and the actual maximum output power in the wind speed range where the wind speed was at the previous moment, and use it as the wind speed where the wind speed was at the previous moment Allowable power difference within a segment.

Optionally, the control unit is further configured to: adjust the real-time rotational speed of the wind generating set according to the rotational speed increment until the difference between the theoretical maximum output power and the current output power in the wind speed range where the wind speed is located at the previous moment is less than the allowable until the power is poor.

Optionally, the correspondence establishing unit is further configured to: obtain the actual maximum output power and the corresponding actual rotational speed in each wind speed segment according to the historical operation data of the wind power generating set.

Optionally, the corresponding relationship establishing unit is further configured to: determine whether the current output power of the wind generating set is greater than the actual maximum output power in the wind speed segment where the current wind speed is located; if the current output power is greater than the actual maximum output power in the wind speed segment output power, update the corresponding relationship between the actual maximum output power and the corresponding actual rotational speed in the wind speed segment to the corresponding relationship between the current output power and the current rotational speed.

In another general aspect, a wind park comprising a control device as described above is provided.

In another general aspect, a computing device is provided, the computing device includes a computer-readable storage medium and a processor, the computer-readable storage medium stores programs or instructions, when the programs or instructions are executed by the processor When executed, the above-mentioned control method is realized.

In another general aspect, a controller of a wind park is provided, the controller being configured to perform the control method as described above.

By adopting the control method, device and wind power generating set according to the exemplary embodiments of the present invention, by segmenting the wind speed range and feeding back the output power in real time, the rotational speed increment is determined based on the fed back output power and the corresponding wind speed segment, It can effectively avoid the problem that the speed increment in the hill-climbing algorithm is difficult to determine, and can avoid the problem that the small fluctuation of wind speed causes the control performance of the wind turbine to decrease. It is also possible to calculate the allowable power difference based on the theoretical maximum output power and the actual maximum output power, thereby effectively avoiding the influence of parameter changes during the real-time operation of the wind turbine on the accuracy of maximum output power tracking, and at the same time avoiding the theoretical maximum output power. The maximum output power tracking time of the unit caused by the difficulty of reaching is too long. By using a hybrid control strategy based on power signal feedback algorithm and hill-climbing algorithm to quickly and accurately track the maximum output power according to wind speed changes, so as to maximize wind energy.

Description of drawings

The above and other objects and features of the present invention will become clearer through the following description in conjunction with the accompanying drawings, wherein:

Fig. 1 is a block diagram of a control device of a wind power generating set according to an exemplary embodiment of the present invention;

Figure 2 shows an exemplary two-dimensional array according to the present invention;

FIG. 3 is a partial flowchart of a control method according to an exemplary embodiment of the present invention;

Fig. 4 is another partial flow chart of the control method according to an exemplary embodiment of the present invention;

FIG. 5 is another partial flow chart of the control method according to the exemplary embodiment of the present invention.

Detailed ways

The maximum power point tracking (MPPT) of wind turbines can be realized by using the optimal tip speed ratio algorithm, power signal feedback algorithm, hill climbing algorithm, three-point comparison algorithm, fuzzy logic control algorithm, duty cycle disturbance algorithm, etc. )Control Strategy. The hill-climbing algorithm does not require any wind measuring device, has low requirements on the power characteristics of the wind turbine, and has the advantages of strong adaptability and small system dependence. It can quickly track the optimal speed under different wind conditions, increasing the adaptability to different wind speeds. However, the disturbance increment design of the fixed-step-length hill-climbing method is difficult: if the increment is too small, the system adjustment process will be slow; Ineffective. The control performance in the power signal feedback algorithm largely depends on the difference between the generation environment of the optimal power curve and the actual operating environment of the unit. Often, the optimal power curve cannot be reached during the actual operation of the unit, and the control performance of the unit is affected. . The three-point comparison algorithm adjusts the speed by comparing the mechanical power of three different speeds to achieve maximum power tracking, which can avoid the power loss on the machine side caused by the disturbance of the unit at the maximum power point, but it has poor adaptability to wind speed changes. The fuzzy logic search method can realize the intelligent variable step size tracking of the maximum power of the generator by establishing the membership function of the power increment, the last speed increment and the output speed increment, but determine the fuzzy set, the shape of the membership function and formulate the rule table, etc. The key link needs to rely on the experience of the designer, which is difficult in engineering application.

As mentioned above, there are many deficiencies in applying the above algorithm alone to the MPPT control strategy of wind turbines, but the hybrid control strategy based on hill climbing algorithm and power signal feedback algorithm proposed by the present invention can effectively avoid the above deficiencies.

Exemplary embodiments of the present invention will now be described more fully with reference to the accompanying drawings, in which some example embodiments are shown but to which the invention is not limited.

Fig. 1 is a block diagram of a control device 10 of a wind power generating set according to an exemplary embodiment of the present invention. The control device 10 may include a wind speed section division unit 101 , a correspondence relationship establishment unit 102 , a data acquisition unit 103 , a rotational speed increment determination unit 104 , and a control unit 105 .

The wind speed segment division unit 101 can divide the wind speed range before the wind power generating set reaches the rated wind speed into a plurality of wind speed segments. Or unequally divided into m wind speed segments (m is a natural number greater than 1). At the same time, the wind speed section division unit 101 can set the value of m according to the actual demand, the larger the value of m is, the higher the accuracy of tracking the maximum output power of the wind generating set by the control device 10 is.

The corresponding relationship establishing unit 102 may establish, for each wind speed segment, the corresponding relationship between the theoretical maximum output power and the corresponding theoretical rotational speed within the wind speed segment, and the corresponding relationship between the actual maximum output power and the corresponding actual rotational speed. For example, the correspondence establishing unit 102 may obtain the theoretical maximum output power and the corresponding theoretical rotational speed of each wind speed segment according to the theoretical maximum output power curve of the wind power generating set, and establish a corresponding relationship accordingly. The theoretical maximum output power curve may be provided by the manufacturer of the wind power generating set, or it may be the maximum output power curve under ideal working conditions calculated according to the characteristics of the wind power generating set. In addition, the correspondence establishment unit 102 may obtain the actual maximum output power and the corresponding actual rotational speed in each wind speed segment according to the historical operation data of the wind power generating set, and establish a correspondence accordingly.

Fig. 2 shows an exemplary two-dimensional array according to the present invention to present the correspondence.

In the example shown in FIG. 2 , the corresponding relationship establishment unit 102 can establish, for each wind speed segment, the theoretical maximum output power P1 in the wind speed segment and the corresponding theoretical rotational speed N1 as the first dimension and the actual output power in the wind speed segment. The maximum output power P2 and the corresponding actual rotational speed N2 are two-dimensional arrays of the second dimension, so as to present the corresponding relationship between the theoretical maximum output power and the corresponding theoretical rotational speed in each wind speed segment, and the corresponding relationship between the actual maximum output power and the corresponding actual rotational speed.

The data acquisition unit 103 can acquire the real-time wind speed and real-time output power of the wind power generating set. The data acquisition unit 103 can also acquire the real-time rotational speed of the wind power generating set. The acquired real-time wind speed, real-time output power, and real-time rotational speed correspond to the entire operation process of the wind power generating set.

During the operation of the wind power generating set, the data acquisition unit 103 can obtain the real-time wind speed of the wind generating set through the wind speed measuring device (for example, wind radar, wind speed sensor), and can obtain the real-time output power of the wind generating set through the power measuring device, The real-time rotational speed of the wind power generating set can also be obtained through the rotational speed measuring device.

The rotational speed increment determination unit 104 may receive the real-time wind speed, real-time output power and/or real-time rotational speed from the data acquisition unit 103 , and may receive the divided wind speed segments from the wind speed segment division unit 101 . Furthermore, the rotation speed increment determining unit 104 may determine the wind speed segment where the real-time wind speed is located. In addition, the rotation speed increment determination unit 104 may also receive the correspondence between the theoretical maximum output power and the corresponding theoretical rotation speed, and the correspondence between the actual maximum output power and the corresponding actual rotation speed for each wind speed segment from the correspondence establishment unit 102 . For example, the rotational speed increment determination unit 104 may receive a two-dimensional array of multiple wind speed segments from the correspondence relationship establishment unit 102, and then determine the correspondence between the theoretical maximum output power in the wind speed segment and the corresponding theoretical rotational speed according to the wind speed segment where the real-time wind speed is located. , The corresponding relationship between the actual maximum output power and the corresponding actual speed.

The rotational speed increment determination unit 104 may determine the rotational speed increment of the wind power generating set according to the corresponding relationship between the real-time output power and the wind speed segment in which the real-time wind speed is located.

In the example of the present invention, the rotation speed increment determining unit 104 may calculate the allowable power difference in the wind speed range where the real-time wind speed is located according to the theoretical maximum output power and the actual maximum output power in the wind speed range where the real-time wind speed is located. For example, but not limited to, the allowable power difference in the wind speed segment can be half of the difference between the theoretical maximum output power and the actual maximum output power in the wind speed segment, that is, Dp=(P1-P2)/2, where Dp is the allowable power difference in the wind speed range, P1 and P2 are the theoretical maximum output power and the actual maximum output power in the wind speed range respectively. By calculating the allowable power difference based on the theoretical maximum output power and the actual maximum output power, it can effectively avoid the influence of the parameter changes in the real-time operation of the wind turbine on the accuracy of the maximum output power tracking, and at the same time avoid the difficulty in achieving the theoretical maximum output power. As a result, the maximum output power tracking time of the unit is too long.

In the example of the present invention, the rotational speed increment determining unit 104 may calculate the allowable power difference in the wind speed range at the previous time according to the theoretical maximum output power and the actual maximum output power in the wind speed range at the previous time. Optionally, the rotation speed increment determination unit 104 may calculate the allowable power difference in the wind speed range where the current wind speed is located according to the theoretical maximum output power and the actual maximum output power in the wind speed segment where the current wind speed is, so as to determine the rotation speed increase at the next moment. quantity.

In the example of the present invention, the rotational speed increment determining unit 104 may determine whether the wind speed segment where the current wind speed is located is the wind speed segment where the wind speed is located at the previous moment.

If the wind speed segment where the current wind speed is located is the wind speed segment where the wind speed was located at the previous moment, the rotational speed increment determining unit 104 can determine whether the difference between the theoretical maximum output power and the current output power in the wind speed segment where the wind speed is located at the previous moment is smaller than the previous one. The allowable power difference within the wind speed segment where the wind speed is located at any moment. If the difference between the theoretical maximum output power and the current output power in the wind speed segment where the wind speed is located at the previous moment is smaller than the allowable power difference in the wind speed segment where the wind speed is located at the previous moment, the rotational speed increment determining unit 104 may determine that the rotational speed increment is zero , to stop the maximum output power tracking. Otherwise, the rotational speed increment determining unit 104 may determine the rotational speed increment as the difference between the theoretical rotational speed and the current rotational speed in the wind speed segment where the wind speed is at the previous moment.

If the wind speed segment where the current wind speed is located is not the wind speed segment where the wind speed was located at the previous moment, the rotational speed increment determining unit 104 may determine the rotational speed increment as the difference between the theoretical rotational speed and the current rotational speed in the wind speed segment where the current wind speed is located.

The control unit 105 may receive the rotational speed increment from the rotational speed increment determination unit 104, and control the operation of the wind power generating set according to the rotational speed increment. In the example of the present invention, the control unit 105 can adjust the real-time rotational speed of the wind power generating set according to the rotational speed increment until the difference between the theoretical maximum output power and the current output power in the wind speed range where the wind speed was at the previous moment is less than the wind speed at the previous moment. Up to the allowable power difference in the wind speed range, that is, the speed increment is zero.

During the process of the control unit 105 adjusting the real-time rotational speed of the wind generating set according to the rotational speed increment, the control unit 105 can use a hill-climbing algorithm to adjust the real-time rotational speed of the wind generating set according to the rotational speed increment, so as to track the speed that satisfies the above-mentioned condition based on the allowable power difference. maximum output power.

As mentioned above, by feeding back the output power in real time and determining the speed increment based on the fed-back output power, the problem that the speed increment in the hill-climbing algorithm is difficult to determine can be effectively avoided, and the problem of small fluctuations in wind speed causing the control performance of the wind turbine to decrease question.

By calculating the allowable power difference based on the theoretical maximum output power and the actual maximum output power, it can effectively avoid the influence of the parameter changes in the real-time operation of the wind turbine on the accuracy of the maximum output power tracking, and at the same time avoid the difficulty in achieving the theoretical maximum output power. As a result, the maximum output power tracking time of the unit is too long.

Therefore, by using the hybrid control strategy based on the power signal feedback algorithm and the hill climbing algorithm, the maximum output power can be tracked rapidly and accurately according to the change of wind speed, so as to obtain the maximum wind energy.

In addition, the correspondence relationship establishment unit 102 can also obtain the current wind speed, current output power and current rotational speed of the wind power generating set from the data acquisition unit 103, and determine whether the current output power is greater than the actual maximum output power in the wind speed range where the current wind speed is located. If the current output power is greater than the actual maximum output power in the wind speed segment, the correspondence relationship establishment unit 102 may update the corresponding relationship between the actual maximum output power in the wind speed segment and the corresponding actual rotational speed to the corresponding relationship between the current output power and the current rotational speed . In this way, the corresponding relationship between the theoretical maximum output power and the corresponding theoretical rotational speed in each wind speed segment, and the corresponding relationship between the actual maximum output power and the corresponding actual rotational speed can be updated in real time through the corresponding relationship establishment unit 102, so that the accuracy of the maximum output power tracking get improved.

An exemplary embodiment according to the present invention also provides a wind power plant comprising a control device 10 of the wind power plant.

A control method according to an exemplary embodiment of the present invention is described below with reference to FIGS. 3 to 5 .

In step S101, the wind speed range before reaching the rated wind speed can be divided into a plurality of wind speed segments. For example, the wind speed range may be from the cut-in wind speed to the rated wind speed of the wind power generating set, and the wind speed range may be divided into m wind speed segments (m is a natural number greater than 1) equally or unequally. The value of m can be set according to actual requirements. The larger the value of m is, the higher the accuracy of tracking the maximum output power of the wind power generating set is.

Step S102 , for each wind speed segment, establish the corresponding relationship between the theoretical maximum output power and the corresponding theoretical rotational speed in the wind speed segment, and the corresponding relationship between the actual maximum output power and the corresponding actual rotational speed. For example, the theoretical maximum output power of each wind speed segment and the corresponding theoretical rotational speed can be obtained according to the theoretical maximum output power curve of the wind power generating set, and a corresponding relationship can be established accordingly. The theoretical maximum output power curve may be provided by the manufacturer of the wind power generating set, or it may be the maximum output power curve under ideal working conditions calculated according to the characteristics of the wind power generating set. In addition, the actual maximum output power and the corresponding actual rotational speed in each wind speed segment can be obtained according to the historical operation data of the wind power generating set, and a corresponding relationship can be established accordingly. The corresponding relationship may be a two-dimensional array as shown in FIG. 2 .

In step S103, the real-time wind speed and real-time output power of the wind power generating set can be obtained.

In step S104, the wind speed segment where the real-time wind speed is located, the corresponding relationship between the theoretical maximum output power and the corresponding theoretical rotational speed, and the corresponding relationship between the actual maximum output power and the corresponding actual rotational speed within the wind speed range may be determined.

In step S105, the allowable power difference in the wind speed range at the previous moment may be calculated according to the theoretical maximum output power and the actual maximum output power in the wind speed range at the previous moment. For example, but not limited to, the allowable power difference in the wind speed segment can be half of the difference between the theoretical maximum output power and the actual maximum output power in the wind speed segment, that is, Dp=(P1-P2)/2, where Dp is the allowable power difference in the wind speed range, P1 and P2 are the theoretical maximum output power and the actual maximum output power in the wind speed range respectively.

Step S106, it may be determined whether the wind speed segment where the current wind speed is located is the wind speed segment where the wind speed was located at the previous moment. If the wind speed segment where the current wind speed is located is the wind speed segment where the wind speed is located at the previous moment, then execute step S107 , otherwise execute step S111 .

In step S107, it may be determined whether the difference between the theoretical maximum output power and the current output power in the wind speed range at the previous moment is smaller than the allowable power difference in the wind speed range at the previous moment. If the difference between the theoretical maximum output power and the current output power in the wind speed range where the wind speed is at the previous moment is smaller than the allowable power difference in the wind speed range where the wind speed is at the previous moment, then execute step S108; otherwise, execute step S109.

In step S108, it may be determined that the rotational speed increment is zero, thereby stopping the maximum output power tracking.

In step S109, the current rotational speed of the wind power generating set can be obtained, and the rotational speed increment is determined as the difference between the theoretical rotational speed and the current rotational speed in the wind speed range where the wind speed is at the previous moment.

Step S110, the operation of the wind power generating set may be controlled according to the rotational speed increment. In the example of the present invention, the real-time speed of the wind power generating set can be adjusted according to the speed increment, for example, the real-time speed can be adjusted to the sum of the theoretical speed and the speed increment, and then step S103 is executed in a loop until the wind speed at the previous moment is The difference between the theoretical maximum output power in the segment and the current output power is less than the allowable power difference in the wind speed segment where the wind speed was at the previous moment, that is, the speed increment is zero.

In step S111, the current rotational speed of the wind power generating set may be obtained, and the rotational speed increment is determined as the difference between the theoretical rotational speed and the current rotational speed within the wind speed range where the current wind speed is located.

In step S112, the real-time rotational speed of the wind power generating set may be adjusted according to the rotational speed increment determined in step S111, and then step S103 is executed in a loop until the difference between the theoretical maximum output power and the current output power in the wind speed segment where the wind speed is located at the previous moment is less than the previous The allowable power difference within the wind speed segment where the wind speed is located at all times, that is, the speed increment is zero.

The control method according to the present invention can also update the corresponding relationship in each wind speed segment, as shown in FIG. 5 .

In step S201, the current wind speed, current output power and current rotational speed of the wind power generating set can be acquired.

In step S202, it may be determined whether the current output power is greater than the actual maximum output power in the wind speed range where the current wind speed is located. If the current output power is greater than the actual maximum output power in the wind speed range, then execute step S203, otherwise execute step S201 again.

In step S203, the corresponding relationship between the actual maximum output power and the corresponding actual rotational speed in the wind speed segment may be updated to the corresponding relationship between the current output power and the current rotational speed.

According to an exemplary embodiment of the present invention, there is also provided a computing device, the computing device includes a computer-readable storage medium and a processor, and the computer-readable storage medium stores a computer that causes the processor to execute the above-mentioned control method when executed by the processor program or instruction. The computer-readable recording medium is any data storage device that can store data read by a computer system. Examples of computer-readable recording media include: read-only memory, random-access memory, optical disc, magnetic tape, floppy disk, optical data storage devices, and carrier waves (such as data transmission over the Internet via wired or wireless transmission paths).

An exemplary embodiment according to the present invention also provides a controller of a wind power generating set, which can be configured to execute the control method as described above.

By adopting the control method, device and wind power generating set according to the exemplary embodiments of the present invention, by segmenting the wind speed range and feeding back the output power in real time, the rotational speed increment is determined based on the fed back output power and the corresponding wind speed segment, It can effectively avoid the problem that the speed increment in the hill-climbing algorithm is difficult to determine, and can avoid the problem that the small fluctuation of wind speed causes the control performance of the wind turbine to decrease.

By adopting the control method and device of the wind power generator set and the wind power generator set according to the exemplary embodiments of the present invention, the allowable power difference can be calculated according to the theoretical maximum output power and the actual maximum output power, thereby effectively avoiding the real-time operation of the wind power generator set. The parameter change has an impact on the accuracy of the maximum output power tracking, and at the same time, it can also avoid the excessively long tracking time of the maximum output power of the unit caused by the difficulty in reaching the theoretical maximum output power.

Therefore, the control method and device for a wind power generating set according to an exemplary embodiment of the present invention, and the wind power generating set can quickly and accurately track the maximum output power according to changes in wind speed by using a hybrid control strategy based on a power signal feedback algorithm and a hill-climbing algorithm, Thereby gaining maximum wind energy.

Although the present invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various modifications and changes may be made to these embodiments without departing from the spirit and scope of the invention as defined in the claims .

Claims (13)

1. A control method for a wind power generating set, characterized in that the control method comprises: Divide the wind speed range before the wind turbine reaches the rated wind speed into multiple wind speed segments; For each wind speed segment, establish the corresponding relationship between the theoretical maximum output power and the corresponding theoretical rotational speed, the actual maximum output power and the corresponding actual rotational speed in the wind speed segment; Obtain the real-time wind speed and real-time output power of the wind power generating set, determine the wind speed segment where the real-time wind speed is located and the corresponding relationship in the wind speed segment; According to the corresponding relationship in the real-time output power and the wind speed segment where the real-time wind speed is located, determine the rotational speed increment of the wind rotor, and control the operation of the wind power generating set according to the rotational speed increment, Among them, for each wind speed segment, the step of establishing the corresponding relationship between the theoretical maximum output power in the wind speed segment and the corresponding theoretical rotational speed, the actual maximum output power and the corresponding actual rotational speed includes: establishing the theoretical maximum output power and the corresponding theoretical rotational speed in the wind speed segment. The corresponding theoretical speed is the first dimension and the actual maximum output power and the corresponding actual speed in the wind speed range are the two-dimensional array of the second dimension, Wherein, the steps of determining the rotational speed increment include: According to the theoretical maximum output power and the actual maximum output power in the wind speed segment where the wind speed is located at the previous moment, the allowable power difference in the wind speed segment where the wind speed is located at the previous moment is calculated; Determine whether the wind speed segment where the current wind speed is located is the wind speed segment where the wind speed is located at the previous moment; If the wind speed section where the current wind speed is located is the wind speed section where the wind speed was located at the previous moment, then determine whether the difference between the theoretical maximum output power and the current output power in the wind speed section where the wind speed is located at the previous moment is less than the allowable power difference; If the difference between the theoretical maximum output power and the current output power is smaller than the allowable power difference, then determine that the rotational speed increment is zero; If the difference between the theoretical maximum output power and the current output power is not less than the allowable power difference, then determine the rotational speed increment as the difference between the theoretical rotational speed and the current rotational speed in the wind speed segment where the wind speed is at the previous moment; If the wind speed segment where the current wind speed is located is not the wind speed segment where the wind speed is located at the previous moment, then the rotational speed increment is determined to be the difference between the theoretical rotational speed and the current rotational speed in the wind speed segment where the current wind speed is located. 2. The control method according to claim 1, characterized in that the allowable power difference in the wind speed segment where the wind speed was located at the previous moment is half of the difference between the theoretical maximum output power and the actual maximum output power in the wind speed segment one. 3. The control method according to claim 1, characterized in that, the step of controlling the operation of the wind power generating set according to the rotational speed increment comprises: adjusting the real-time rotational speed of the wind power generating set according to the rotational speed increment until the previous moment Until the difference between the theoretical maximum output power and the current output power within the wind speed range where the wind speed is less than the allowable power difference. 4. The control method according to claim 1, further comprising: obtaining the actual maximum output power and the corresponding actual rotational speed in each wind speed segment according to the historical operation data of the wind power generating set. 5. The control method according to claim 1, wherein the control method further comprises: Determine whether the current output power of the wind turbine is greater than the actual maximum output power in the wind speed segment where the current wind speed is located; If the current output power is greater than the actual maximum output power in the wind speed range, the corresponding relationship between the actual maximum output power in the wind speed range and the corresponding actual rotation speed is updated to the corresponding relationship between the current output power and the current rotation speed. 6. A control device for a wind power generating set, characterized in that the control device comprises: The wind speed segment division unit is configured to divide the wind speed range before the wind turbine reaches the rated wind speed into a plurality of wind speed segments; The corresponding relationship establishment unit is configured to, for each wind speed segment, establish the corresponding relationship between the theoretical maximum output power and the corresponding theoretical rotational speed, and the actual maximum output power and the corresponding actual rotational speed within the wind speed segment; The data acquisition unit is configured to acquire the real-time wind speed and real-time output power of the wind generating set; The rotation speed increment determination unit is configured to determine the wind speed segment where the real-time wind speed is located and the corresponding relationship in the wind speed segment, and determine the rotation speed of the wind rotor according to the real-time output power and the corresponding relationship in the wind speed segment where the real-time wind speed is located increment; a control unit configured to control the operation of the wind turbine according to said rotational speed increment, Wherein, the corresponding relationship establishment unit is further configured to: for each wind speed segment, establish the theoretical maximum output power in the wind speed segment and the corresponding theoretical rotational speed as the first dimension and the actual maximum output power in the wind speed segment and the corresponding actual A two-dimensional array with rotational speed as the second dimension, Wherein, the rotational speed increment determining unit is further configured as: According to the theoretical maximum output power and the actual maximum output power in the wind speed segment where the wind speed is located at the previous moment, the allowable power difference in the wind speed segment where the wind speed is located at the previous moment is calculated; Determine whether the wind speed segment where the current wind speed is located is the wind speed segment where the wind speed is located at the previous moment; If the wind speed section where the current wind speed is located is the wind speed section where the wind speed was located at the previous moment, then determine whether the difference between the theoretical maximum output power and the current output power in the wind speed section where the wind speed is located at the previous moment is less than the allowable power difference; If the difference between the theoretical maximum output power and the current output power is smaller than the allowable power difference, then determine that the rotational speed increment is zero; If the difference between the theoretical maximum output power and the current output power is not less than the allowable power difference, then determine the rotational speed increment as the difference between the theoretical rotational speed and the current rotational speed in the wind speed segment where the wind speed is at the previous moment; If the wind speed segment where the current wind speed is located is not the wind speed segment where the wind speed is located at the previous moment, then the rotational speed increment is determined to be the difference between the theoretical rotational speed and the current rotational speed in the wind speed segment where the current wind speed is located. 7. The control device according to claim 6, wherein the rotation speed increment determination unit is further configured to: calculate the difference between the theoretical maximum output power and the actual maximum output power in the wind speed segment where the wind speed is at the previous moment. One-tenth, as the allowable power difference in the wind speed segment where the wind speed was at the previous moment. 8. The control device according to claim 6, wherein the control unit is further configured to: adjust the real-time rotational speed of the wind power generating set according to the rotational speed increment until the theoretical maximum in the wind speed segment where the wind speed was at the previous moment until the difference between the output power and the current output power is smaller than the allowable power difference. 9. The control device according to claim 6, wherein the correspondence relationship establishment unit is further configured to: obtain the actual maximum output power and the corresponding actual rotational speed in each wind speed segment according to the historical operation data of the wind power generating set. 10. The control device according to claim 6, characterized in that, the correspondence relationship establishment unit is further configured to: Determine whether the current output power of the wind turbine is greater than the actual maximum output power in the wind speed segment where the current wind speed is located; If the current output power is greater than the actual maximum output power in the wind speed range, the corresponding relationship between the actual maximum output power in the wind speed range and the corresponding actual rotation speed is updated to the corresponding relationship between the current output power and the current rotation speed. 11. A wind power generating set, characterized in that the wind power generating set comprises the control device according to any one of claims 6-10. 12. A computing device, characterized in that the computing device includes a computer-readable storage medium and a processor, the computer-readable storage medium stores programs or instructions, and when the programs or instructions are executed by the processor At the same time, the control method according to any one of claims 1 to 5 is realized. 13. A controller for a wind power generating set, characterized in that the controller is configured to execute the control method according to any one of claims 1-5.

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