CN105649876A - Control method and device of wind generating set - Google Patents

Abstract

Embodiments of the present invention provide a control method and device for a wind turbine generator. The control method includes: obtaining the first wind speed at the current moment; if the first wind speed is greater than the wind speed threshold, obtaining the first average pitch angle within the first preset time period, wherein the end time of the first preset time period The point is the current moment; if the first average pitch angle is greater than the pitch angle threshold, a first speed regulation instruction for triggering a reduction in the rated speed of the wind turbine is sent to the pitch controller of the wind turbine. By adopting the embodiments of the present invention, the problem of overspeed shutdown of the wind turbine generator set under strong gusty wind conditions can be solved, and the power generation efficiency of the wind turbine generator set can be improved.

Description

Wind turbine control method and device

technical field

The invention relates to wind power generation technology, in particular to a control method and device for a wind power generating set.

Background technique

With the continuous development of new energy technology, wind power generation technology is more and more favored by people, and how to control the wind power generation unit has become a hot issue in people's research.

After the wind turbine is started and the wind speed reaches the rated wind speed, it usually works at rated power, rated speed and rated torque. If there is a strong wind that exceeds the rated wind speed (but does not reach the cut-out wind speed of the wind turbine), the impeller speed of the wind turbine will increase instantaneously, so that the wind turbine will be shut down due to over-speed protection, thereby reducing the wind turbine. power generation efficiency.

Contents of the invention

The purpose of the present invention is to adjust the rotational speed of the wind power generating set by judging whether the current wind condition is a strong gust wind condition, so that the rotational speed of the wind generating set fluctuates on the basis of a reduced level, and avoids the wind power exceeding the threshold when the rotational speed exceeds the threshold. The generator set fails and shuts down, thereby solving the problem of overspeed shutdown of the wind generator set under strong gust wind conditions, and improving the power generation efficiency of the wind generator set.

According to an aspect of the present invention, a control method for a wind power generating set is provided. The control methods include:

Get the first wind speed at the current moment;

If the first wind speed is greater than the wind speed threshold, then obtain a first average pitch angle within a first preset duration, wherein the end time point of the first preset duration is the current moment;

If the first average pitch angle is greater than the pitch angle threshold, a first speed regulation instruction for triggering a reduction in the rated speed of the wind power generating set is sent to the pitch controller of the wind generating set.

According to another aspect of the present invention, a control device for a wind power generating set is provided. The control device includes:

The first wind speed obtaining module is used to obtain the first wind speed at the current moment;

A first pitch angle acquisition module, configured to acquire a first average pitch angle within a first preset duration if the first wind speed is greater than a wind speed threshold, wherein the end time point of the first preset duration is current moment;

The first speed regulation instruction sending module is used to send the first speed regulation instruction for triggering the reduction of the rated speed of the wind power generating set to the wind power generator if the first average pitch angle is greater than the pitch angle threshold. Pitch controller for generator set.

According to the control method and device of the wind power generating set provided by the embodiments of the present invention, by detecting in real time whether the instantaneous wind speed and the pitch angle of the wind generating set exceed the corresponding threshold, and then judge whether there is a strong gust of wind at present, if it is judged to exceed the corresponding threshold, then determine the current When a strong gust occurs, the rated speed of the wind turbine will be actively reduced so that the speed of the wind turbine fluctuates at a lower level, while the overspeed fault threshold of the wind turbine remains unchanged, thereby effectively preventing the wind turbine from operating at a relatively high speed. When the level fluctuates at a high level, strong gusts are likely to cause overspeed shutdown of the unit, which improves the power generation efficiency of the wind power generation unit.

Description of drawings

Fig. 1 is a flow chart showing a control method of a wind power generating set according to Embodiment 1 of the present invention;

Fig. 2 is a flowchart illustrating a control method of a wind power generating set according to Embodiment 2 of the present invention;

Fig. 3 is a logic block diagram showing a control device for a wind power generating set according to Embodiment 3 of the present invention;

Fig. 4 is another logic block diagram showing the control device of the wind power generating set according to the third embodiment of the present invention.

detailed description

The inventive idea of this scheme is to first judge in real time the strong gust wind condition that may cause the overspeed of the wind power generating set, and moderately reduce the maximum speed of the unit, that is, the rated speed, when the strong gust wind condition occurs. When the wind speed fluctuates quickly, the speed of the unit fluctuates on the basis of the reduced level, avoiding the speed exceeding the threshold that causes the overspeed shutdown of the wind turbine, and avoiding the failure of the wind turbine to stop, thereby solving the overspeed of the wind turbine under strong gust wind conditions Stop the problem and improve the power generation efficiency of wind turbines.

Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Embodiment one

Fig. 1 is a flow chart showing a control method of a wind power generating set according to Embodiment 1 of the present invention. The control method is executed by including a control device as shown in FIG. 3 .

Referring to Fig. 1, in step S110, the first wind speed at the current moment is obtained.

Specifically, the rated speed of the wind turbine is usually fixed. When a strong gust occurs, the speed of the wind turbine fluctuates greatly, so it is easy to exceed the overspeed fault threshold, causing the wind turbine to fail and shut down. Therefore, through The anemometer installed in the wind turbine can measure the instantaneous wind speed outside in real time. When the wind power generating set is working normally, start the anemometer and detect the instantaneous wind speed (namely the first wind speed) outside at the current moment.

In step S120, if the first wind speed is greater than the wind speed threshold, a first average pitch angle within a first preset time period is obtained.

Wherein, the end time point of the first preset duration may be the current moment. The wind speed threshold may be set according to actual conditions, for example, the wind speed threshold may be a wind speed higher than the rated wind speed of the wind power generating set by more than 4m/s. The first duration can be set according to actual conditions, such as 3 minutes or 5 minutes.

Specifically, the instantaneous wind speed cannot uniquely determine that the current state is a strong gust, and the pitch angle can be used as an auxiliary judgment condition. The corresponding processing may include: comparing the first wind speed with a predetermined wind speed threshold, if the first wind speed is greater than the wind speed threshold, it is determined that the current instantaneous wind speed is relatively high. At this time, the pitch angle of the wind turbine can be detected by the pitch angle detection component. When the first preset time is reached, the first time can be calculated by the detected pitch angle. The first average pitch angle in . If the first wind speed is not greater than the wind speed threshold, the above step S110 may be repeatedly performed.

In step S130, if the first average pitch angle is greater than the pitch angle threshold, a first speed regulation command for triggering a reduction in the rated speed of the wind power generation set is sent to the pitch controller of the wind power generation set.

Wherein, the pitch angle threshold may be determined according to the approximate range of the pitch angle of the wind power generating set when the wind speed is the wind speed threshold under normal conditions, or may be set according to actual conditions.

Specifically, the obtained first average pitch angle can be compared with the pitch angle threshold, and if the first average pitch angle is greater than the pitch angle threshold, it can be determined that the current wind speed is high and the pitch angle is no longer at the minimum position Above, it can be considered that the current state is a strong gust of wind, at this time, the first speed regulation command can be generated and sent to the pitch controller. In this way, after the pitch controller receives the first speed regulation command, it can reduce the rated speed of the wind turbine to a predetermined speed, for example, to K times the rated speed, where K is a constant less than 1, specifically as 0.85. If the first average pitch angle is not greater than the pitch angle threshold, it can be determined that the current wind speed is not high, and it can be considered that the current is not a strong gust state. At this time, the above steps S110 to S130 can be repeatedly performed.

It should be noted that if there is an abnormality when detecting the wind speed, or if the wind speed detection is normal but the operation status of the wind turbine is abnormal, the above pitch angle conditions will not be satisfied. At this time, the wind turbine will not be allowed to Its rated speed is adjusted.

The control method of the wind power generating set provided by the embodiment of the present invention detects in real time whether the instantaneous wind speed and pitch angle of the wind generating set exceed the corresponding threshold, and then logically judges whether there is a strong gust of wind at present. In case of strong gusts, the rated speed of the wind turbine will be actively reduced so that the speed of the wind turbine fluctuates at a lower level, while the overspeed fault threshold of the wind turbine remains unchanged, thereby effectively preventing the wind turbine from operating at a relatively high speed. When the level fluctuates, due to strong gusts, it is easy to cause over-speed shutdown of the unit, so as to improve the power generation efficiency of the wind power generation unit.

Embodiment two

FIG. 2 is a flow chart showing a control method for a wind power generating set according to Embodiment 2 of the present invention, and this embodiment can be regarded as another specific implementation solution of FIG. 1 .

Referring to Fig. 2, in step S210, the first wind speed at the current moment is obtained.

The step content of step S210 is the same as the step content of step S110 in the first embodiment above, and will not be repeated here.

In step S220, if the first wind speed is greater than the wind speed threshold, a first average pitch angle within a first preset time period is obtained.

The step content of step S220 is the same as the step content of step S120 in the first embodiment above, and will not be repeated here.

In addition, the first preset duration can have multiple representation forms. In order to fully and accurately indicate the current strong gust state, the end time point of the first preset duration can be set as the current moment. Correspondingly, the current moment can be used as At the end of the time point, search before the current time to obtain a plurality of pitch angles within the first preset time length, and perform an average calculation on the multiple pitch angles to obtain the first average pitch within the first preset time length horn. For example, if the current time is 15:15:00 and the first preset duration is 3 minutes, then the first average pitch angle within 15:12:00-15:15:00 can be obtained.

In step S230, if the first average pitch angle is greater than the pitch angle threshold, the first average wind speed within the second preset time period with the current moment as the end time point is obtained.

Wherein, the second preset duration can be set according to the actual situation, for example, 10 seconds or 15 seconds.

Specifically, in order to improve the accuracy of judging the strong gust state, in addition to the instantaneous wind speed and the average pitch angle as the judgment parameters, it is also possible to further use the magnitude of the wind speed increase in a short period of time to determine whether the current state is a strong gust state, and the corresponding processing It may include: the instantaneous wind speed at each moment may be recorded in advance. The obtained average pitch angle can be compared with the pitch angle threshold. If the average pitch angle is greater than the pitch angle threshold, it can be determined that the current wind speed is high and the pitch angle is not at the minimum position. At this time, the current The time is the end time point, and the second predetermined time period is acquired before the current time. At the same time, the instantaneous wind speed within the second predetermined time period can be obtained, and the average value of the instantaneous wind speed can be calculated to obtain the first average wind speed.

It should be noted that the first average wind speed can also be obtained in other ways, such as the first average wind speed can be a constant, or the output result of a wind speed model calculation formula, such as the function of c=f(v), c is the first average wind speed, and v is the average wind speed in a short period of time. The average wind speed in a short period of time determines the difference in the value of c. In this way, the adaptability of the wind turbine to complex wind conditions can be improved. The calculation formula of the wind speed model can be established according to the actual wind conditions of the wind field.

In step S240, if the first wind speed is greater than the first average wind speed, a first speed regulation instruction for triggering a reduction of the rated speed of the wind power generating set is sent to the pitch controller of the wind generating set.

Specifically, the obtained first wind speed can be compared with the first average wind speed, if the first wind speed is greater than the first average wind speed, it can be determined that the current wind speed is relatively high, and it can be considered that the current state is a strong gust. At this time, the first wind speed can be generated. A speed regulation command is sent to the pitch controller. After receiving the first speed regulation command, the pitch controller can lower the rated speed of the wind turbine, so that the speed of the wind turbine fluctuates at a lower level to avoid The speed of the wind power generating set exceeds the rated speed, causing the wind power generating set to stop at an overspeed.

Further, considering the stability and power generation efficiency of the wind generator set, after reducing the rated speed of the wind generator set, the torque of the wind generator set can be appropriately increased to ensure that the output power of the wind generator set is as stable as possible. Therefore, the process of sending the first speed regulation instruction for triggering the reduction of the rated speed of the wind generating set to the pitch controller of the wind generating set in the above step S240 may include the following content: The rated speed of the wind turbine is reduced to the predetermined target speed, and the first speed regulation instruction is sent to the pitch controller of the wind turbine; Torque controller for wind turbines.

Specifically, if it is determined through the processing of step S240 that the first wind speed is greater than the first average wind speed, the first speed regulation instruction and the first torque regulation instruction can be generated, in order to reduce the rated speed of the wind power generation set as soon as possible to avoid the wind power generation To stop at a high speed, the first speed regulation command can be sent to the pitch controller first, and the rated speed of the wind turbine can be lowered to the target speed through the pitch controller, and then the first torque regulation command can be sent to the torque controller , the torque controller can increase the rated torque of the wind power generating set to the target torque, so as to ensure that the adjusted wind power generating set has a higher power generation efficiency as much as possible.

Further, the values of the target rotational speed and the target torque satisfy the condition of keeping the rated power of the wind power generating set unchanged.

It should be noted that, in the process of adjusting the rated speed and rated torque of the wind turbine, the adjustment process can be carried out by means of the rated speed adjustment coefficient and the rated torque adjustment coefficient, wherein the rated speed adjustment coefficient and the rated torque adjustment coefficient are related to the wind force The relationship between the power of the generating set can be as follows:

T _e ＝K _opt *Ω ² ………………………(1)

$\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; =</span>{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; 9.55</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}\mathrm{<span\; class="notranslate">\; p</span>}\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; *</span>\mathrm{<span\; class="notranslate">\; 0.001</span>}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Ω＝2πn/60…………………………(3)

According to the formulas (1), (2), (3), it can be deduced that

P＝0.9n*T _e /9.55 ³ π ² ..........................(4)

Among them, T _e is the electromagnetic torque, K _opt is the optimal gain, Ω is the angular velocity, P is the power, and n is the rotational speed.

The initial rated power before adjustment is P _e , and the power P after adjustment can be deduced from formula (4)

P＝k ₁ *k ₂ *P _e ...................................(5)

According to the formula (5), it can be seen that when the rated torque adjustment coefficient k ₂ =1/k ₁ , the output power of the wind generator set before and after the rated speed adjustment can be guaranteed to remain unchanged.

In addition, for the rated speed adjustment coefficient k ₁ , it can be a constant, such as k ₁ =0.97, or can be determined by a preset algorithm, such as the average wind speed in a short period of time, taking the average wind speed of 10 seconds as an example, the rated speed adjustment coefficient k ₁ is a function of the variable v _10s , k ₁ =f(v _10s ), and v _10s is the average wind speed for 10s.

k ₁ =f(v _10s ) can be a piecewise and continuous function:

${\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 10</span>}\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\left\{\begin{array}{cc}\mathrm{<span\; class="notranslate">\; 0.99</span>}& {\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 10</span>}\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; <</span>\mathrm{<span\; class="notranslate">\; 18</span>}\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}\\ <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; 0.013</span>}}^{{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 10</span>}\mathrm{<span\; class="notranslate">\; the\; s</span>}}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1.225</span>}& \mathrm{<span\; class="notranslate">\; 18</span>}\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}<span\; class="notranslate">\; \&le;</span>{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 10</span>}\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; <</span>\mathrm{<span\; class="notranslate">\; 25</span>}\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}\\ \mathrm{<span\; class="notranslate">\; 0.90</span>}& {\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 10</span>}\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; \&Greater\; Equal;</span>\mathrm{<span\; class="notranslate">\; 25</span>}\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}\end{array}\right.<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; )</span>$

The rated rotational speed adjustment coefficient k ₁ and the rated torque adjustment coefficient k ₂ can be determined through the above contents.

In addition, in order to ensure the operation stability of the wind turbine, a timer can be set to set an execution period (such as 2 minutes) for the strong gust state. The timer is set with an output terminal (ie TOF.Q). When the output terminal is 1 , it can be determined that the current wind generating set is in a strong gust state, and at this time, the first speed regulation instruction for triggering the reduction of the rated speed of the wind generating set to a predetermined target speed is sent to the pitch controller of the wind generating set , and sending the first torque adjustment instruction for triggering the increase of the rated torque of the wind power generating set to a predetermined target torque to the torque controller of the wind generating set, so that the pitch controller and the torque controller perform corresponding operations; When the output terminal is 0, it can be determined that the timing is over. At this time, the wind generator set still works at the target speed or returns to the rated speed depending on the current wind condition.

When the timer preset execution period (such as 2 minutes) arrives, it can be judged by the current instantaneous wind speed whether the wind turbine can resume to work at the rated speed, and the corresponding processing may include the following steps S250 and S260.

In step S250, when the third preset duration is reached, the second wind speed is acquired.

Wherein, the third preset duration may be an execution period preset by the timer for the strong gust state, such as 2 minutes or 3 minutes.

Specifically, when the rated speed is reduced to the target speed and the rated torque is increased to the target torque, the timer can be used for timing. When the execution period preset for the strong gust state is reached, the output terminal TOF.Q of the timer is 0. At this time, the current wind speed can be obtained through the anemometer, that is, the second wind speed.

In step S260, if the second wind speed is not greater than the wind speed threshold, a second speed regulation instruction for triggering the increase of the target speed of the wind power generating set to the rated speed is sent to the pitch controller of the wind power generating set, and the The second torque adjustment instruction for triggering the reduction of the target torque of the wind power generating set to the rated torque is sent to the torque controller of the wind power generating set.

Specifically, the second wind speed can be compared with the wind speed threshold, and if the second wind speed is not greater than the wind speed threshold, a second speed regulation instruction and a second torque regulation instruction can be generated, and the second speed regulation instruction can be sent to the pitch control The pitch controller can convert the speed of the wind turbine from the target speed to the rated speed. At the same time, it can also send the second torque adjustment command to the torque controller, and the torque controller can convert the torque from the target torque to the rated speed. torque.

In addition to adjusting the speed from the target speed to the rated speed and the torque from the target torque to the rated torque through the above methods, it can also be handled in other ways, such as:

Method 1: After the rated speed is reduced to the target speed and the rated torque is increased to the target torque, the timer can be used for timing. When the execution period preset for the strong gust state is reached, the output terminal TOF.Q of the timer is 0, timing can be started at this time, and when the fourth preset time length is reached, the second average pitch angle within the fourth preset time length is obtained, wherein, the fourth preset time length can be the time length for obtaining the average pitch angle, such as 3 minutes wait. Then, the second average pitch angle can be compared with the pitch angle threshold, if the second average pitch angle is not greater than the pitch angle threshold, then the third The speed regulation command is sent to the pitch controller of the wind generator set, and the pitch controller can increase the target speed of the wind generator set to the rated speed, and can reduce the target torque of the wind generator set to the rated torque. The three-adjustment torque command is sent to the torque controller of the wind power generating set, and the torque controller can reduce the target torque of the wind generating set to the rated torque.

Method 2, when the fifth preset time is reached, the third wind speed and the second average wind speed within the second preset time are acquired, and if the third wind speed is not greater than the second average wind speed, it will be used to trigger the wind turbine The fourth speed regulation instruction for increasing the target speed to the rated speed is sent to the pitch controller of the wind turbine, and the fourth torque regulation instruction for triggering the reduction of the target torque of the wind turbine to the rated torque is sent to the wind turbine torque controller.

Wherein, the fifth preset duration is an execution period preset by the timer for the strong gust state, such as 2 minutes.

Specifically, when the rated speed is reduced to the target speed and the rated torque is increased to the target torque, the timer can be used for timing. When the execution period preset for the strong gust state is reached, the output terminal TOF.Q of the timer is 0. At this time, the third wind speed and the second average wind speed within the second preset time period are obtained. Then, the third wind speed can be compared with the second average wind speed. If the third wind speed is not greater than the second average wind speed, the The fourth speed regulation instruction for triggering the increase of the target speed of the wind power generation set to the rated speed is sent to the pitch controller of the wind power generation The torque command is sent to the torque controller of the wind power generating set. For the above-mentioned specific processing method, please refer to the relevant content above, and will not repeat it here.

Mode 3, when the sixth preset duration is reached, the fifth speed regulation instruction for triggering the increase of the target speed of the wind turbine to the rated speed will be sent to the pitch controller of the wind turbine, and will be used to trigger the The fifth torque adjustment instruction that reduces the target torque of the wind power generating set to the rated torque is sent to the torque controller of the wind power generating set.

Wherein, the sixth preset duration may be the execution period preset by the timer for the strong gust state, such as 2 minutes or 3 minutes, or it may be set according to the actual situation.

For the above-mentioned processing manner, reference may be made to the above-mentioned related content, which will not be repeated here.

Through the above content, the timer is a cycle after the execution period preset for the strong gust state, and if the timer is not triggered, the wind power generating set switches to the rated speed and rated torque. The timer is a cycle after the preset execution period of the strong gust state, and if the timer is triggered again, the wind power generator will continue to work at the target speed and target torque. Therefore, the TOF.Q state of the timer output terminal can be used as the switching condition of the two control modes, so that the wind turbine must run in the strong gust control mode for 2 minutes when a strong gust is detected to deal with the instantaneous strong gust. During this time period, if no strong gust is detected, the wind turbine will not switch out of the strong gust control mode, which avoids the problem that the wind turbine control mode switches back and forth due to too short a PLC scan cycle and cannot stabilize the speed.

It should be noted that for steps S210 and S220, if the first wind speed is not greater than the wind speed threshold, it can be detected whether the timer output TOF.Q is 1, and if the timer output TOF.Q is 1, the target speed Work with the target torque, if the timer output TOF.Q is 0, then work with the rated speed and rated torque.

For step S230, if the first average pitch angle is not greater than the pitch angle threshold, it can be detected whether the timer output TOF.Q is 1, if the timer output TOF.Q is 1, then the target speed and target Torque work, if the timer output TOF.Q is 0, it will work at rated speed and rated torque.

For step S240, if the first wind speed is not greater than the first average wind speed, it can be detected whether the timer output TOF.Q is 1, if the timer output TOF.Q is 1, then work with the target speed and target torque, if the timer If the output terminal TOF.Q is 0, it will work at rated speed and rated torque. For specific relevant content, reference may be made to the above-mentioned relevant content, which will not be repeated here.

In the control method of the wind power generating set provided by the embodiment of the present invention, on the one hand, after comparing and judging the first wind speed and the wind speed threshold and the average pitch angle and the pitch angle threshold, further by comparing the first wind speed with the first average wind speed Compare and judge to determine whether the current is a strong gust wind condition, improve the ability to identify strong gust wind conditions, and improve the control accuracy of the wind turbine; on the other hand, the speed and torque of the wind turbine can be adjusted Return to the rated value, or, through the relationship between the wind speed and the wind speed threshold, or the wind speed and the average wind speed, restore the speed and torque of the wind turbine to the rated value, thereby improving the power generation efficiency and stability of the wind turbine.

Embodiment Three

Based on the same technical concept, Fig. 3 is a logic block diagram showing a control device for a wind power generating set according to Embodiment 3 of the present invention. Referring to FIG. 3 , the control device includes a first wind speed acquisition module 310 , a first pitch angle acquisition module 320 and a first speed regulation instruction sending module 330 .

The first wind speed acquisition module 310 is used to acquire the first wind speed at the current moment.

The first pitch angle acquisition module 320 is configured to acquire the first average pitch angle within the first preset time period if the first wind speed is greater than the wind speed threshold, wherein the end time point of the first preset time length is the current moment .

The first speed regulation command sending module 330 is used to send the first speed regulation command for triggering the reduction of the rated speed of the wind power generating set to the wind power generating set if the first average pitch angle is greater than the pitch angle threshold. pitch controller.

Further, on the basis of the embodiment shown in FIG. 3 , the first speed regulation instruction sending module 330 shown in FIG. 4 includes: a first average wind speed acquisition unit 331 , configured to if the first average pitch angle is greater than the The distance angle threshold value, then obtain the first average wind speed within the second preset time period with the current moment as the end time point; the first speed regulation instruction sending unit 332 is used to if the first wind speed is greater than the first average wind speed, Then, the first speed regulation instruction for triggering the reduction of the rated rotational speed of the wind generating set is sent to the pitch controller of the wind generating set.

In addition, the first speed regulation instruction sending module 330 is used to send the first speed regulation instruction for triggering the reduction of the rated speed of the wind power generating set to a predetermined target speed to the pitch controller of the wind power generating set; The first torque adjustment instruction is sent to the torque controller of the wind generating set to trigger the increase of the rated torque of the wind generating set to a predetermined target torque.

In addition, the values of the target rotational speed and the target torque satisfy the condition of keeping the rated power of the wind power generating set unchanged.

Further, the control device also includes: a second wind speed acquiring module, used to acquire a second wind speed when the third preset time period is reached; a second speed regulation instruction sending module, used to if the second wind speed is not greater than the wind speed threshold, then the second speed regulation command used to trigger the increase of the target speed of the wind power generating set to the rated speed is sent to the pitch controller of the wind power generating set, and will be used to trigger the wind power generating set The target torque is reduced to the rated torque and the second torque adjustment instruction is sent to the torque controller of the wind power generating set; or, the second pitch angle acquisition module is used to acquire the fourth pitch angle when the fourth preset duration is reached. The second average pitch angle within the preset time period, the third speed regulation instruction sending module is used to trigger the wind power generating set if the second average pitch angle is not greater than the pitch angle threshold The third speed regulation command that the target speed is increased to the rated speed is sent to the pitch controller of the wind power generating set, and will be used to trigger the third torque regulating command that reduces the target torque of the wind power generating set to the rated torque sent to the torque controller of the wind power generating set; or, the third wind speed acquisition module is used to obtain the third wind speed and the second average wind speed within the second preset time length when the fifth preset time length is reached, and the fourth a speed regulation instruction sending module, configured to send a fourth speed regulation instruction for triggering the increase of the target speed of the wind power generating set to the rated speed to the wind power if the third wind speed is not greater than the second average wind speed the pitch controller of the generating set, and send the fourth torque adjustment instruction for triggering the reduction of the target torque of the wind generating set to the rated torque to the torque controller of the wind generating set; or, the fifth speed regulation The command sending module is used to send the fifth speed regulation command for triggering the increase of the target speed of the wind power generating set to the rated speed to the pitch controller of the wind power generating set when the sixth preset time period is reached , and send the fifth torque adjustment instruction for triggering the reduction of the target torque of the wind power generating set to the rated torque to the torque controller of the wind generating set.

The control device of the wind power generating set provided by the embodiment of the present invention detects in real time whether the instantaneous wind speed and the pitch angle of the wind generating set exceed the corresponding threshold, and then judges whether there is a strong gust of wind at present. , then actively reduce the rated speed of the wind turbine, so that the speed of the wind turbine fluctuates at a lower level, while the overspeed fault threshold of the wind turbine remains unchanged, thereby effectively avoiding the fluctuation of the wind turbine speed at a relatively high level Sometimes, due to strong gusts, it is easy to cause over-speed shutdown of the unit, so as to improve the power generation efficiency of the wind power generation unit.

Further, in the embodiment of the present invention, on the one hand, after comparing and judging the first wind speed with the wind speed threshold and the average pitch angle with the pitch angle threshold, further judging by comparing the first wind speed with the first average wind speed, Determine whether the current is a strong gust wind condition, improve the ability to identify strong gust wind conditions, and improve the control accuracy of the wind turbine; on the other hand, restore the speed and torque of the wind turbine to the rated value by setting the preset time length , or, through the relationship between the wind speed and the wind speed threshold, or the wind speed and the average wind speed, restore the speed and torque of the wind generator to the rated value, thereby improving the power generation efficiency and stability of the wind generator.

It should be pointed out that according to the needs of implementation, each step/component described in this application can be split into more steps/components, and two or more steps/components or part of the operations of steps/components can also be combined into a new Step/component, to realize the object of the present invention.

The above-mentioned method according to the present invention can be implemented in hardware, firmware, or as software or computer code that can be stored in a recording medium (such as CDROM, RAM, floppy disk, hard disk or magneto-optical disk), or as a computer code downloaded through the network. Computer code originally stored on a remote recording medium or a non-transitory machine-readable medium to be stored on a local recording medium so that the methods described herein can be stored on a computer using a general purpose computer, a dedicated processor, or programmable or dedicated hardware Such software processing on a recording medium (such as ASIC or FPGA). It will be appreciated that a computer, processor, microprocessor controller, or programmable hardware includes memory components (e.g., RAM, ROM, flash memory, etc.) that can store or receive software or computer code that, when When accessed and executed by a processor or hardware, the processing methods described herein are implemented. Furthermore, when a general-purpose computer accesses the code for implementing the processing shown here, the execution of the code converts the general-purpose computer into a special-purpose computer for executing the processing shown here.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (10)

1. A control method for a wind power generating set, characterized in that the control method comprises: Get the first wind speed at the current moment; If the first wind speed is greater than the wind speed threshold, then obtain a first average pitch angle within a first preset duration, wherein the end time point of the first preset duration is the current moment; If the first average pitch angle is greater than the pitch angle threshold, a first speed regulation instruction for triggering a reduction in the rated speed of the wind power generating set is sent to the pitch controller of the wind generating set. 2. The control method according to claim 1, wherein if the first average pitch angle is greater than a pitch angle threshold, the first The process of sending the speed regulation command to the pitch controller of the wind generating set includes: If the first average pitch angle is greater than the pitch angle threshold, then acquire the first average wind speed within a second preset time period with the current moment as the end time point; If the first wind speed is greater than the first average wind speed, a first speed regulation instruction for triggering a reduction of the rated speed of the wind power generating set is sent to the pitch controller of the wind generating set. 3. The control method according to claim 2, wherein the first speed regulation command for triggering the reduction of the rated speed of the wind power generating set is sent to the pitch controller of the wind generating set Processing includes: Sending a first speed regulation instruction for triggering the reduction of the rated speed of the wind power generating set to a predetermined target speed to the pitch controller of the wind power generating set; Sending a first torque adjustment instruction for triggering the increase of the rated torque of the wind power generating set to a predetermined target torque to the torque controller of the wind power generating set. 4. The control method according to claim 3, wherein the values of the target rotational speed and the target torque satisfy the condition of keeping the rated power of the wind power generating set unchanged. 5. control method according to claim 4, is characterized in that, described control method also comprises: When the third preset duration is reached, the second wind speed is obtained, and if the second wind speed is not greater than the wind speed threshold, it will be used to trigger the increase of the target speed of the wind generating set to the rated speed The second speed regulation command is sent to the pitch controller of the wind power generating set, and the second torque regulating command for triggering the reduction of the target torque of the wind power generating set to the rated torque is sent to the Torque controllers for wind turbines; or, When the fourth preset duration is reached, the second average pitch angle within the fourth preset duration is acquired, and if the second average pitch angle is not greater than the pitch angle threshold, it will be used to trigger the The third speed regulation instruction that the target speed of the wind power generating set is increased to the rated speed is sent to the pitch controller of the wind power generating set, and will be used to trigger the change of the target speed of the wind power generating set to A third torque adjustment command whose torque is reduced to the rated torque is sent to the torque controller of the wind power generating set; or, When the fifth preset duration is reached, the third wind speed and the second average wind speed within the second preset duration are acquired, and if the third wind speed is not greater than the second average wind speed, it will be used to trigger the The fourth speed regulation instruction that increases the target speed of the wind power generating set to the rated speed is sent to the pitch controller of the wind power generating set, and will be used to trigger the change of the target torque of the wind power generating set to Sending the fourth torque adjustment instruction reduced to the rated torque to the torque controller of the wind power generating set; or, When the sixth preset duration is reached, sending a fifth speed regulation instruction for triggering the increase of the target speed of the wind generating set to the rated speed to the pitch controller of the wind generating set, and Sending a fifth torque adjustment instruction for triggering the reduction of the target torque of the wind power generating set to the rated torque to the torque controller of the wind power generating set. 6. A control device for a wind power generating set, characterized in that the control device comprises: The first wind speed obtaining module is used to obtain the first wind speed at the current moment; A first pitch angle acquisition module, configured to acquire a first average pitch angle within a first preset duration if the first wind speed is greater than a wind speed threshold, wherein the end time point of the first preset duration is current moment; The first speed regulation instruction sending module is used to send the first speed regulation instruction for triggering the reduction of the rated speed of the wind power generating set to the wind power generator if the first average pitch angle is greater than the pitch angle threshold. Pitch controller for generator set. 7. The control device according to claim 6, wherein the first speed regulation command sending module comprises: A first average wind speed acquisition unit, configured to acquire the first average wind speed within a second preset time period with the current moment as the end time point if the first average pitch angle is greater than the pitch angle threshold; A first speed regulation instruction sending unit, configured to send a first speed regulation instruction for triggering a reduction of the rated speed of the wind generating set to the wind power generator if the first wind speed is greater than the first average wind speed The pitch controller of the unit. 8. The control device according to claim 7, wherein the first speed regulation instruction sending module is used for: Sending the first speed regulation instruction for triggering the reduction of the rated speed of the wind generating set to a predetermined target speed to the pitch controller of the wind generating set; will be used to trigger reducing the rated speed of the wind generating set The first torque adjustment instruction that the torque is increased to a predetermined target torque is sent to the torque controller of the wind power generating set. 9. The control device according to claim 8, wherein the values of the target rotational speed and the target torque satisfy the condition of keeping the rated power of the wind power generating set unchanged. 10. The control device according to claim 9, wherein the control device further comprises: The second wind speed acquisition module is used to acquire the second wind speed when the third preset duration is reached, A second speed regulation command sending module, configured to trigger a second speed regulation that increases the target speed of the wind power generating set to the rated speed if the second wind speed is not greater than the wind speed threshold The instruction is sent to the pitch controller of the wind generating set, and the second torque adjustment instruction for triggering the reduction of the target torque of the wind generating set to the rated torque is sent to the pitch controller of the wind generating set torque controller; or, The second pitch angle acquisition module is used to obtain the second average pitch angle within the fourth preset time length when the fourth preset time length is reached, A third speed regulation command sending module, configured to trigger an increase of the target speed of the wind generating set to the rated speed if the second average pitch angle is not greater than the pitch angle threshold The third speed regulation instruction is sent to the pitch controller of the wind generating set, and the third torque adjusting instruction for triggering the reduction of the target torque of the wind generating set to the rated torque is sent to the pitch controller of the wind generating set the torque controller of the above-mentioned wind turbine; or, The third wind speed acquisition module is configured to acquire the third wind speed and the second average wind speed within the second preset time length when the fifth preset time length is reached, A fourth speed regulation instruction sending module, configured to trigger a fourth speed regulation command to increase the target speed of the wind power generating set to the rated speed if the third wind speed is not greater than the second average wind speed. The speed regulation command is sent to the pitch controller of the wind power generating set, and the fourth torque regulating command for triggering the reduction of the target torque of the wind power generating set to the rated torque is sent to the wind power generator the torque controller of the unit; or, The fifth speed regulation instruction sending module is configured to send the fifth speed regulation instruction for triggering the increase of the target speed of the wind generating set to the rated speed when the sixth preset time period is reached to the The pitch controller of the wind generating set, and sends the fifth torque adjustment command for triggering the reduction of the target torque of the wind generating set to the rated torque to the torque controller of the wind generating set.