CN105649876A - Control method and device of wind generating set - Google Patents
Control method and device of wind generating set Download PDFInfo
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- CN105649876A CN105649876A CN201511032715.6A CN201511032715A CN105649876A CN 105649876 A CN105649876 A CN 105649876A CN 201511032715 A CN201511032715 A CN 201511032715A CN 105649876 A CN105649876 A CN 105649876A
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- 230000033228 biological regulation Effects 0.000 claims description 54
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- 238000010248 power generation Methods 0.000 description 4
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/0256—Stall control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/0276—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling rotor speed, e.g. variable speed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Sustainable Development (AREA)
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
Abstract
The embodiment of the invention provides a control method and device of a wind generating set. The control method comprises the following steps: acquiring a first wind speed at the current moment; if the first wind speed is greater than a wind speed threshold value, acquiring a first average pitch angle within a first preset time length, wherein the end time point of the first preset time length is the current time; and if the first average pitch angle is larger than the pitch angle threshold value, sending a first speed regulating instruction for triggering reduction of the rated rotating speed of the wind generating set to a pitch controller of the wind generating set. By adopting the embodiment of the invention, the problem of overspeed shutdown of the wind generating set under a strong gust wind condition can be solved, and the generating efficiency of the wind generating set is improved.
Description
Technical Field
The invention relates to a wind power generation technology, in particular to a control method and a control device of a wind generating set.
Background
With the continuous development of new energy technology, the wind power generation technology is more and more favored by people, and how to control the wind generating set becomes a hot problem of research of people.
After the wind generating set is started, the wind generating set usually operates at a rated power, a rated rotating speed and a rated torque after the wind speed reaches a rated wind speed. If strong wind exceeding the rated wind speed is high (but the wind speed does not reach the cut-out wind speed of the wind generating set), the rotating speed of the impeller of the wind generating set is instantly increased, so that the wind generating set is shut down due to overspeed protection, and the generating efficiency of the wind generating set is reduced.
Disclosure of Invention
The invention aims to adjust the rotating speed of the wind generating set by judging whether the current wind condition is a strong gust wind condition or not, so that the rotating speed of the wind generating set fluctuates on the basis of reducing the level, and the wind generating set is prevented from being stopped due to the fact that the rotating speed exceeds a threshold value, the problem that the wind generating set is stopped at an overspeed under the strong gust wind condition is solved, and the generating efficiency of the wind generating set is improved.
According to an aspect of the present invention, a control method of a wind turbine generator set is provided. The control method comprises the following steps:
acquiring a first wind speed at the current moment;
if the first wind speed is greater than a wind speed threshold value, acquiring a first average pitch angle within a first preset time length, wherein the end time point of the first preset time length is the current time;
and if the first average pitch angle is larger than a pitch angle threshold value, sending a first speed regulating instruction for triggering reduction of the rated rotating speed of the wind generating set to a pitch controller of the wind generating set.
According to another aspect of the invention, a control device of a wind turbine generator set is provided. The control device includes:
the first wind speed acquisition module is used for acquiring a first wind speed at the current moment;
the first pitch angle acquisition module is used for acquiring a first average pitch angle within a first preset time length if the first wind speed is greater than a wind speed threshold, wherein the end time point of the first preset time length is the current time;
and the first speed regulation instruction sending module is used for sending a first speed regulation instruction for triggering and reducing the rated rotating speed of the wind generating set to a variable pitch controller of the wind generating set if the first average pitch angle is larger than a pitch angle threshold value.
According to the control method and the control device of the wind generating set provided by the embodiment of the invention, whether the instantaneous wind speed and the pitch angle of the wind generating set exceed the corresponding threshold values is detected in real time, so that whether strong gust occurs at present is judged, if the strong gust occurs at present is determined to exceed the corresponding threshold values, the rated rotating speed of the wind generating set is actively reduced, so that the rotating speed of the wind generating set fluctuates at a lower level, and the overspeed fault threshold value of the wind generating set is kept unchanged, thereby effectively avoiding the over-speed shutdown fault of the wind generating set caused by the strong gust when the rotating speed of the wind generating set fluctuates at a relatively higher level, and improving the generating efficiency of the wind generating set.
Drawings
Fig. 1 is a flow chart illustrating a control method of a wind turbine generator system according to a first embodiment of the invention;
fig. 2 is a flow chart illustrating a control method of a wind turbine generator set according to a second embodiment of the present invention;
fig. 3 is a logic block diagram showing a control apparatus of a wind turbine generator system according to a third embodiment of the present invention;
fig. 4 is another logic block diagram showing a control apparatus of a wind turbine generator system according to a third embodiment of the present invention.
Detailed Description
The invention of the scheme is that a strong gust wind condition which may cause the overspeed of the wind generating set is judged in real time, and the maximum rotating speed of the set, namely the rated rotating speed, is properly reduced when the strong gust wind condition occurs. When the wind speed fluctuates rapidly, the rotating speed of the wind generating set fluctuates on the basis of the reduced level, the rotating speed is prevented from exceeding the threshold value which causes the overspeed shutdown of the wind generating set, and the fault shutdown of the wind generating set is avoided, so that the problem of the overspeed shutdown of the wind generating set under the condition of strong gust wind is solved, and the generating efficiency of the wind generating set is improved.
Exemplary embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example one
Fig. 1 is a flowchart illustrating a control method of a wind turbine generator system according to a first embodiment of the present invention. The control method is performed by including a control device as shown in fig. 3.
Referring to fig. 1, in step S110, a first wind speed at the current time is acquired.
Specifically, the rated rotating speed of the wind generating set is usually fixed and unchanged, and the fluctuation of the rotating speed of the wind generating set becomes large when strong gust occurs, so that the rotating speed easily exceeds an overspeed fault threshold value to cause the wind generating set to be in fault shutdown. When the wind generating set works normally, the anemoscope is started and the external instantaneous wind speed (namely the first wind speed) at the current moment is detected.
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.
The ending time point of the first preset duration may be the current time. The wind speed threshold value can be set according to actual conditions, for example, the wind speed threshold value can be a wind speed which is higher than the rated wind speed of the wind generating set by more than 4 m/s. The first time period can be set according to actual conditions, such as 3 minutes or 5 minutes.
Specifically, the instantaneous wind speed cannot be uniquely determined to be in the strong wind gust state, the pitch angle may be used as an auxiliary determination condition, and the corresponding processing may include: and comparing the first wind speed with a preset wind speed threshold, if the first wind speed is greater than the wind speed threshold, determining that the current instantaneous wind speed is higher, detecting the pitch angle of the wind generating set through a pitch angle detection component, and calculating a first average pitch angle in the first time period through the detected pitch angle after the first preset time period is reached. If the first wind speed is not greater than the wind speed threshold, the process of 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 instruction for triggering reduction of the rated rotation speed of the wind turbine generator system is sent to a pitch controller of the wind turbine generator system.
The pitch angle threshold value may be determined according to an approximate range of the pitch angle of the wind turbine generator set when the wind speed is the wind speed threshold value under normal conditions, or may be set according to actual conditions.
Specifically, the obtained first average pitch angle may be compared with a pitch angle threshold, and if the first average pitch angle is greater than the pitch angle threshold, it may be determined that the current wind speed is high, the pitch angle is not at the minimum position, and it may be considered that the current wind gust state is a strong gust state, and at this time, a first speed adjustment instruction may be generated and sent to the pitch controller. In this way, after receiving the first speed regulation instruction, the pitch controller may regulate the rated rotation speed of the wind turbine generator system to a predetermined rotation speed, for example, to K times the rated rotation speed, where K is a constant less than 1, specifically 0.85. If the first average pitch angle is not greater than the pitch angle threshold, it may be determined that the current wind speed is not large, and it may be considered that the current wind speed is in a non-strong wind state, and at this time, the processes of step S110 to step S130 may be repeatedly performed.
It should be noted that, if an abnormality occurs when the wind speed is detected, or if the wind speed is detected normally but the operating state of the wind turbine generator system is abnormal, the pitch angle condition may be unsatisfied, and at this time, the wind turbine generator system is not allowed to adjust the rated rotation speed.
According to the control method of the wind generating set provided by the embodiment of the invention, whether the instantaneous wind speed and the pitch angle of the wind generating set exceed the corresponding threshold values is detected in real time, and then the logic judgment is carried out to judge whether the strong gust occurs at present, if the judgment exceeds the corresponding threshold values, the strong gust is determined to occur at present, the rated rotating speed of the wind generating set is actively reduced, so that the rotating speed of the wind generating set fluctuates at a lower level, and the overspeed fault threshold value of the wind generating set is kept unchanged, thereby effectively avoiding the over-speed shutdown fault of the wind generating set caused by the strong gust when the rotating speed of the wind generating set fluctuates at a relatively higher level, and improving the.
Example two
Fig. 2 is a flow chart illustrating a control method of a wind turbine generator system according to a second embodiment of the present invention, which may be regarded as a further specific implementation of fig. 1.
Referring to fig. 2, in step S210, a first wind speed at the current time is acquired.
The content of step S210 is the same as the content of step S110 in the first embodiment, and is not 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 content of step S220 is the same as the content of step S120 in the first embodiment, and is not repeated here.
In addition, the first preset time period may have a plurality of representation forms, in order to sufficiently and accurately indicate that the current state is a strong gust state, the ending time point of the first preset time period may be set as the current time, and correspondingly, the current time may be used as the ending time point, and the current time is searched before the current time to obtain a plurality of pitch angles within the first preset time period, and an average value of the plurality of pitch angles may be calculated to obtain a first average pitch angle within the first preset time period. For example, if the current time is 15:15:00 and the first preset time period is 3 minutes, the first average pitch angle within 15:12:00 to 15:15:00 may be obtained.
In step S230, if the first average pitch angle is greater than the pitch angle threshold, a first average wind speed within a second preset duration with the current time as an end time point is obtained.
The second preset time period may be set according to an actual situation, specifically, 10 seconds or 15 seconds, for example.
Specifically, in order to improve the accuracy of the judgment of the strong gust state, in addition to the instantaneous wind speed and the average pitch angle as the judgment parameters, the amplitude of the wind speed increase in a short time can be further used to judge whether the current state is the strong gust state, and the corresponding processing may include: the instantaneous wind speed at each moment can be pre-recorded. The obtained average pitch angle may be compared with a pitch angle threshold, and if the average pitch angle is greater than the pitch angle threshold, it may be determined that the current wind speed is greater and the pitch angle is not already at the minimum position, at this time, the current time may be an end time point, a second predetermined time period may be obtained before the current time, and at the same time, an instantaneous wind speed within the second predetermined time period may be obtained, and an average value of the instantaneous wind speeds may be calculated to obtain the first average wind speed.
It should be noted that the first average wind speed may be obtained by other means, for example, the first average wind speed may be a constant, or may be an output result of a wind speed model calculation formula, such as a function of c ═ f (v), where c is the first average wind speed and v is the average wind speed in a short time. The difference of the c value is determined by the average wind speed in a short time, so that the adaptability of the wind generating set under complex wind conditions can be improved, and a wind speed model calculation formula can be established according to the actual wind conditions of a 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 reduction of the rated rotation speed of the wind turbine generator system is sent to a pitch controller of the wind turbine generator system.
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 high, and the current wind speed can be considered to be in a strong gust state.
Further, in consideration of the stability and the power generation efficiency of the wind generating set, after the rated rotation speed of the wind generating set is reduced, the torque of the wind generating set may be appropriately increased to ensure that the output power of the wind generating set is stable as much as possible, and therefore, the processing of sending the first speed regulating instruction for triggering reduction of the rated rotation speed of the wind generating set to the pitch controller of the wind generating set in step S240 may include the following steps: sending a first speed regulating instruction for triggering the reduction of the rated rotating speed of the wind generating set to a preset target rotating speed to a variable pitch controller of the wind generating set; a first torque adjustment command for triggering the increase of the rated torque of the wind turbine generator set to a preset target torque is sent to a torque controller of the wind turbine generator set.
Specifically, if it is determined through the processing in step S240 that the first wind speed is greater than the first average wind speed, a first speed regulation instruction and a first torque regulation instruction may be generated, and in order to reduce the rated rotational speed of the wind turbine generator set as soon as possible to avoid the wind turbine generator set from stopping at an excessive speed, the first speed regulation instruction may be sent to the pitch controller, the rated rotational speed of the wind turbine generator set may be reduced to a target rotational speed by the pitch controller, and then the first torque regulation instruction may be sent to the torque controller, which may increase the rated torque of the wind turbine generator set to the target torque, so as to ensure that the adjusted wind turbine generator set has a higher power generation efficiency as much as possible.
Further, the values of the target rotating speed and the target torque meet the condition of keeping the rated power of the wind generating set unchanged.
It should be noted that, in the process of adjusting the rated rotation speed and the rated torque of the wind turbine generator system, the adjustment process may be performed by using a rated rotation speed adjustment coefficient and a rated torque adjustment coefficient, where the relationship between the rated rotation speed adjustment coefficient and the rated torque adjustment coefficient and the power of the wind turbine generator system may be as follows:
Te＝Kopt*Ω2……………………………(1)
Ω＝2πn/60………………………………(3)
according to the equations (1), (2) and (3), it can be deduced
P＝0.9n*Te/9.553π2...............................(4)
Wherein, TeIs an electromagnetic torque, KoptFor optimal gain, Ω is angular velocity, P is power, and n is rotational speed.
Initial rated power P before regulationeThe power P after regulation can be derived from equation (4)
P＝k1*k2*Pe...............................(5)
According to the formula (5), when the rated torque is adjusted by the coefficient k2＝1/k1And meanwhile, the output power of the wind generating set before and after the rated rotating speed is adjusted is ensured to be unchanged.
In addition, the coefficient k is adjusted for the rated rotation speed1It may be a constant, e.g. k1The speed may be 0.97, or may be determined by a predetermined algorithm, such as average wind speed in a short time, e.g., 10 seconds average wind speed, and the rated speed adjustment coefficient k1To relate to a variable v10sFunction of k1＝f(v10s)，v10sThe average wind speed was 10 s.
k1＝f(v10s) May be a segmented and continuous function:
the setpoint rotational speed adjustment factor k can be determined from the above1And rated torque adjustment coefficient k2。
In addition, in order to ensure the operation stability of the wind generating set, a timer can be set, an execution time interval (such as 2 minutes) is set for the strong gust state, the timer is provided with an output end (namely TOF.Q), when the output end is 1, the current wind generating set can be determined to be in the strong gust state, at the moment, a first speed regulating instruction for triggering the reduction of the rated rotating speed of the wind generating set to a preset target rotating speed is sent to a variable pitch controller of the wind generating set, and a first torque regulating instruction for triggering the increase of the rated torque of the wind generating set to a preset target torque is sent to a torque controller of the wind generating set, so that the variable pitch controller and the torque controller execute corresponding operations; when the output is 0, it may be determined that the timing is over, and whether the wind turbine generator system is still operating at the target speed or is returning to the rated speed may depend on the current wind conditions.
When the preset execution time period (such as 2 minutes) of the timer is reached, whether the wind generating set can be recovered to the rated rotating speed operation can be judged according to the current instantaneous wind speed, and the corresponding processing can comprise the following steps of S250 and S260.
In step S250, when the third preset duration is reached, the second wind speed is acquired.
The third preset time period may be an execution time period preset by the timer for the strong gust state, such as 2 minutes or 3 minutes.
Specifically, after the rated rotation speed is reduced to the target rotation speed and the rated torque is increased to the target torque, the timer may be used to count time, and when the execution time period preset for the strong gust state is reached, the output end tof.q of the timer is 0, and at this time, the current wind speed, that is, the second wind speed, may be obtained by the anemometer.
In step S260, if the second wind speed is not greater than the wind speed threshold, a second speed regulation command for triggering the target rotation speed of the wind turbine generator system to be increased to the rated rotation speed is sent to a pitch controller of the wind turbine generator system, and a second torque regulation command for triggering the target torque of the wind turbine generator system to be decreased to the rated torque is sent to a torque controller of the wind turbine generator system.
Specifically, the second wind speed may be compared with a wind speed threshold, if the second wind speed is not greater than the wind speed threshold, a second speed regulation instruction and a second torque regulation instruction may be generated, and the second speed regulation instruction may be sent to the pitch controller, the pitch controller may convert the rotation speed of the wind turbine generator set from the target rotation speed to the rated rotation speed, and simultaneously, the second torque regulation instruction may also be sent to the torque controller, and the torque controller may convert the torque from the target torque to the rated torque.
Besides the above-mentioned adjustment of the rotation speed from the target rotation speed back to the rated rotation speed and the adjustment of the torque from the target torque back to the rated torque, the adjustment can be processed by other means, such as:
in a first mode, after the rated rotation speed is reduced to the target rotation speed and the rated torque is increased to the target torque, the timer may be used for timing, when an execution time period preset for a strong gust state is reached, tof.q of an output end of the timer is 0, timing may be started at this time, and when a fourth preset time period is reached, a second average pitch angle within the fourth preset time period is obtained, where the fourth preset time period may be a time period for obtaining the average pitch angle, such as 3 minutes. Then, the second average pitch angle may be compared with a pitch angle threshold, if the second average pitch angle is not greater than the pitch angle threshold, a third speed adjustment instruction for triggering an increase of the target rotational speed of the wind turbine generator set to the rated rotational speed may be sent to a pitch controller of the wind turbine generator set, the pitch controller may increase the target rotational speed of the wind turbine generator set to the rated rotational speed, and a third torque adjustment instruction for triggering a decrease of the target torque of the wind turbine generator set to the rated torque may be sent to a torque controller of the wind turbine generator set, and the torque controller may decrease the target torque of the wind turbine generator set to the rated torque.
And secondly, when the fifth preset time length is reached, acquiring a third wind speed and a second average wind speed within the second preset time length, if the third wind speed is not greater than the second average wind speed, sending a fourth speed regulating instruction for triggering the target rotating speed of the wind generating set to be increased to the rated rotating speed to a variable pitch controller of the wind generating set, and sending a fourth torque regulating instruction for triggering the target torque of the wind generating set to be reduced to the rated torque to a torque controller of the wind generating set.
The fifth preset time is an execution time period preset by the timer for the strong gust state, such as 2 minutes.
Specifically, when the rated rotation speed is reduced to the target rotation speed and the rated torque is increased to the target torque, the timer can be used for timing, when the execution time interval preset for the strong gust state is reached, the output end TOF.Q of the timer is 0, the third wind speed and the second average wind speed within the second preset time interval are obtained at the moment, the third wind speed may then be compared to the second average wind speed, and if the third wind speed is not greater than the second average wind speed, sending a fourth speed regulating instruction for triggering the target rotating speed of the wind generating set to be increased to the rated rotating speed to a variable pitch controller of the wind generating set, and sending a fourth torque adjusting command for triggering the reduction of the target torque of the wind generating set to the rated torque to a torque controller of the wind generating set, wherein the specific processing manner can be referred to the related contents, and is not described herein again.
And in a third mode, when the sixth preset time length is reached, sending a fifth speed regulating instruction for triggering the target rotating speed of the wind generating set to be increased to the rated rotating speed to a variable pitch controller of the wind generating set, and sending a fifth torque regulating instruction for triggering the target torque of the wind generating set to be reduced to the rated torque to a torque controller of the wind generating set.
The sixth preset time period may be an execution time period preset by the timer for the strong gust state, such as 2 minutes or 3 minutes, and may also be set according to an actual situation.
The above processing manner can refer to the related contents, and is not described herein again.
Through the above, the timer is one period after the execution time period preset for the strong wind gust state, and if the timer is not triggered, the wind generating set is switched to the rated rotating speed and the rated torque. And the timer is a period after the execution time interval preset in the strong wind gust state, and if the timer is triggered again, the wind generating set continues to work at the target rotating speed and the target torque. Therefore, the TOF.Q state of the output end of the timer can be used as a switching condition of two control modes, so that the wind generating set must run for 2 minutes in the strong gust control mode when detecting that the strong gust exists, and the wind generating set can deal with the instantaneous strong gust. In the time period, if no strong gust is detected, the wind generating set does not switch out the strong gust control mode, so that the problem that the rotating speed cannot be stabilized due to the fact that the control mode of the wind generating set is switched back and forth due to the fact that the scanning period of the PLC is too short is solved.
It should be noted that, for steps S210 and S220, if the first wind speed is not greater than the wind speed threshold, it may be detected whether the timer output tof.q is 1, if the timer output tof.q is 1, the target rotation speed and the target torque are operated, and if the timer output tof.q is 0, the rated rotation speed and the rated torque are operated.
For step S230, if the first average pitch angle is not greater than the pitch angle threshold, it may be detected whether the timer output tof.q is 1, if the timer output tof.q is 1, operating at the target rotational speed and the target torque, if the timer output tof.q is 0, operating at the nominal rotational speed and the nominal torque.
For step S240, it is detected whether the timer output tof.q is 1 if the first wind speed is not greater than the first average wind speed, and operated at the target rotation speed and the target torque if the timer output tof.q is 1, and operated at the rated rotation speed and the rated torque if the timer output tof.q is 0. For specific related contents, reference may be made to the above related contents, which are not described herein again.
On one hand, after the first wind speed is compared with the wind speed threshold and the average pitch angle is compared with the pitch angle threshold, the first wind speed is further compared with the first average wind speed to determine whether the current wind condition is a strong gust wind condition, so that the identification capability of the strong gust wind condition is improved, and the control accuracy of the wind generating set is improved; on the other hand, the rotating speed and the torque of the wind generating set are recovered to the rated values by setting the preset time length, or the rotating speed and the torque of the wind generating set are recovered to the rated values through the relation between the wind speed and the wind speed threshold value or between the wind speed and the average wind speed, so that the generating efficiency and the stability of the wind generating set are improved.
EXAMPLE III
Based on the same technical concept, fig. 3 is a logic block diagram illustrating a control apparatus of a wind turbine generator system according to a third embodiment of the present invention. Referring to fig. 3, the control apparatus includes a first wind speed acquisition module 310, a first pitch angle acquisition module 320, and a first speed regulation instruction transmission module 330.
The first wind speed obtaining module 310 is configured to obtain a first wind speed at a current time.
The first pitch angle obtaining module 320 is configured to obtain a first average pitch angle within a first preset time period if the first wind speed is greater than a wind speed threshold, where an end time point of the first preset time period is a current time.
The first speed regulation instruction sending module 330 is configured to send a first speed regulation instruction for triggering reduction of the rated rotation speed of the wind turbine generator system to a pitch controller of the wind turbine generator system if the first average pitch angle is greater than the pitch angle threshold.
Further, on the basis of the embodiment shown in fig. 3, the first throttling instruction sending module 330 shown in fig. 4 includes: a first average wind speed obtaining unit 331, configured to obtain a first average wind speed within a second preset time period taking the current time as an end time point if the first average pitch angle is greater than a pitch angle threshold; a first speed regulation instruction sending unit 332, configured to send a first speed regulation instruction for triggering reduction of a rated rotation speed of the wind turbine generator system to a pitch controller of the wind turbine generator system if the first wind speed is greater than the first average wind speed.
In addition, the first speed regulation instruction sending module 330 is configured to send a first speed regulation instruction for triggering reduction of the rated rotation speed of the wind turbine generator set to a predetermined target rotation speed to a pitch controller of the wind turbine generator set; and sending a first torque adjusting instruction for triggering the rated torque of the wind generating set to be increased to a preset target torque to a torque controller of the wind generating set.
In addition, the values of the target rotating speed and the target torque meet the condition of keeping the rated power of the wind generating set unchanged.
Further, the control device further includes: a second wind speed obtaining module, configured to obtain a second wind speed when a third preset time length is reached, and a second speed regulation instruction sending module, configured to send a second speed regulation instruction for triggering to increase the target rotation speed of the wind turbine generator system to the rated rotation speed to a pitch controller of the wind turbine generator system and send a second torque regulation instruction for triggering to decrease the target torque of the wind turbine generator system to the rated torque to a torque controller of the wind turbine generator system if the second wind speed is not greater than the wind speed threshold; or, a second pitch angle obtaining module, configured to obtain a second average pitch angle within a fourth preset time when the fourth preset time is reached, and a third speed regulation instruction sending module, configured to send a third speed regulation instruction for triggering to increase the target rotation speed of the wind turbine generator set to the rated rotation speed to a pitch controller of the wind turbine generator set if the second average pitch angle is not greater than the pitch angle threshold, and send a third torque regulation instruction for triggering to decrease the target torque of the wind turbine generator set to the rated torque to a torque controller of the wind turbine generator set; or, a third wind speed obtaining module, configured to obtain a third wind speed and a second average wind speed within a second preset duration when the fifth preset duration is reached, and a fourth speed regulation instruction sending module, configured to send a fourth speed regulation instruction, which is used to trigger the target rotation speed of the wind turbine generator system to be increased to the rated rotation speed, to a pitch controller of the wind turbine generator system and send a fourth torque regulation instruction, which is used to trigger the target torque of the wind turbine generator system to be decreased to the rated torque, to a torque controller of the wind turbine generator system, if the third wind speed is not greater than the second average wind speed; or, the fifth speed regulation instruction sending module is configured to send a fifth speed regulation instruction for triggering the target rotation speed of the wind turbine generator system to be increased to the rated rotation speed to a pitch controller of the wind turbine generator system when a sixth preset duration is reached, and send a fifth torque regulation instruction for triggering the target torque of the wind turbine generator system to be decreased to the rated torque to a torque controller of the wind turbine generator system.
The control device of the wind generating set provided by the embodiment of the invention judges whether the current strong gust occurs or not by detecting whether the instantaneous wind speed and the pitch angle of the wind generating set exceed the corresponding threshold values or not in real time, if so, the current strong gust is determined to occur, and the rated rotating speed of the wind generating set is actively reduced, so that the rotating speed of the wind generating set fluctuates at a lower level, and the overspeed fault threshold value of the wind generating set is kept unchanged, thereby effectively avoiding the over-speed shutdown fault of the wind generating set caused by the strong gust when the rotating speed of the wind generating set fluctuates at a relatively higher level, and improving the generating efficiency of the wind generating set.
Further, in the embodiment of the present invention, on one hand, after the comparison and determination of the first wind speed and the wind speed threshold and the average pitch angle and the pitch angle threshold, the first wind speed and the first average wind speed are further compared and determined to determine whether the current wind condition is a strong gust wind condition, so that the recognition capability of the strong gust wind condition is improved, and the control accuracy of the wind generating set is improved; on the other hand, the rotating speed and the torque of the wind generating set are recovered to the rated values by setting the preset time length, or the rotating speed and the torque of the wind generating set are recovered to the rated values through the relation between the wind speed and the wind speed threshold value or between the wind speed and the average wind speed, so that the generating efficiency and the stability of the wind generating set are improved.
It should be noted that, according to the implementation requirement, each step/component described in the present application can be divided into more steps/components, and two or more steps/components or partial operations of the steps/components can be combined into new steps/components to achieve the purpose of the present invention.
The above-described method according to the present invention can be implemented in hardware, firmware, or as software or computer code storable in a recording medium such as a CDROM, RAM, floppy disk, hard disk, or magneto-optical disk, or as computer code originally stored in a remote recording medium or a non-transitory machine-readable medium downloaded through a network and to be stored in a local recording medium, so that the method described herein can be stored in such software processing on a recording medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware such as ASIC or FPGA. It will be appreciated that the 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 accessed and executed by the computer, processor or hardware, implements the processing methods described herein. Further, when a general-purpose computer accesses code for implementing the processes shown herein, execution of the code transforms the general-purpose computer into a special-purpose computer for performing the processes shown herein.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A control method of a wind generating set is characterized by comprising the following steps:
acquiring a first wind speed at the current moment;
if the first wind speed is greater than a wind speed threshold value, acquiring a first average pitch angle within a first preset time length, wherein the end time point of the first preset time length is the current time;
and if the first average pitch angle is larger than a pitch angle threshold value, sending a first speed regulating instruction for triggering reduction of the rated rotating speed of the wind generating set to a pitch controller of the wind generating set.
2. The control method according to claim 1, wherein the processing of sending a first speed governing instruction to a pitch controller of the wind park for triggering a reduction of a rated rotational speed of the wind park if the first average pitch angle is greater than a pitch angle threshold comprises:
if the first average pitch angle is larger than a pitch angle threshold value, acquiring a first average wind speed within a second preset time period taking the current moment as an end time point;
and if the first wind speed is greater than the first average wind speed, sending a first speed regulating instruction for triggering reduction of the rated rotating speed of the wind generating set to a variable pitch controller of the wind generating set.
3. The control method according to claim 2, wherein the process of sending a first speed regulation command for triggering a reduction of the rated speed of the wind power plant to a pitch controller of the wind power plant comprises:
sending a first speed regulating instruction for triggering the reduction of the rated rotating speed of the wind generating set to a preset target rotating speed to a variable pitch controller of the wind generating set;
sending a first torque adjustment command for triggering the rated torque of the wind generating set to be increased to a preset target torque to a torque controller of the wind generating set.
4. A control method according to claim 3, characterized in that the values of the target rotational speed and the target torque satisfy the condition of keeping the rated power of the wind turbine generator set constant.
5. The control method according to claim 4, characterized by further comprising:
when the third preset time length is reached, acquiring a second wind speed, if the second wind speed is not greater than the wind speed threshold, sending a second speed regulation instruction for triggering the target rotating speed of the wind generating set to be increased to the rated rotating speed to a variable pitch controller of the wind generating set, and sending a second torque regulation instruction for triggering the target torque of the wind generating set to be reduced to the rated torque to a torque controller of the wind generating set; or,
when a fourth preset time length is reached, obtaining a second average pitch angle within the fourth preset time length, if the second average pitch angle is not larger than a pitch angle threshold value, sending a third speed regulation instruction for triggering the target rotating speed of the wind generating set to be increased to the rated rotating speed to a pitch controller of the wind generating set, and sending a third torque regulation instruction for triggering the target torque of the wind generating set to be reduced to the rated torque to a torque controller of the wind generating set; or,
when a fifth preset time length is reached, acquiring a third wind speed and a second average wind speed within the second preset time length, if the third wind speed is not greater than the second average wind speed, sending a fourth speed regulating instruction for triggering to increase the target rotating speed of the wind generating set to the rated rotating speed to a variable pitch controller of the wind generating set, and sending a fourth torque regulating instruction for triggering to reduce the target torque of the wind generating set to the rated torque to a torque controller of the wind generating set; or,
when the sixth preset time length is reached, a fifth speed regulating instruction for triggering the target rotating speed of the wind generating set to be increased to the rated rotating speed is sent to a variable pitch controller of the wind generating set, and a fifth torque regulating instruction for triggering the target torque of the wind generating set to be reduced to the rated torque is sent to a torque controller of the wind generating set.
6. A control device of a wind turbine generator set, characterized in that the control device comprises:
the first wind speed acquisition module is used for acquiring a first wind speed at the current moment;
the first pitch angle acquisition module is used for acquiring a first average pitch angle within a first preset time length if the first wind speed is greater than a wind speed threshold, wherein the end time point of the first preset time length is the current time;
and the first speed regulation instruction sending module is used for sending a first speed regulation instruction for triggering and reducing the rated rotating speed of the wind generating set to a variable pitch controller of the wind generating set if the first average pitch angle is larger than a pitch angle threshold value.
7. The control device according to claim 6, wherein the first throttle command transmission module includes:
a first average wind speed obtaining unit, configured to obtain a first average wind speed within a second preset time period taking the current time as an end time point if the first average pitch angle is greater than a pitch angle threshold;
and the first speed regulating instruction sending unit is used for sending a first speed regulating instruction for triggering and reducing the rated rotating speed of the wind generating set to a variable pitch controller of the wind generating set if the first wind speed is greater than the first average wind speed.
8. The control device of claim 7, wherein the first throttle command sending module is configured to:
sending a first speed regulating instruction for triggering the reduction of the rated rotating speed of the wind generating set to a preset target rotating speed to a variable pitch controller of the wind generating set; sending a first torque adjustment command for triggering the rated torque of the wind generating set to be increased to a preset target torque to a torque controller of the wind generating set.
9. The control device according to claim 8, wherein values of the target rotation speed and the target torque satisfy a condition of keeping a rated power of the wind turbine generator set constant.
10. The control device according to claim 9, characterized by further comprising:
a second wind speed obtaining module for obtaining a second wind speed when a third preset duration is reached,
a second speed regulation instruction sending module, configured to send a second speed regulation instruction for triggering to increase the target rotation speed of the wind turbine generator system to the rated rotation speed to a pitch controller of the wind turbine generator system and send a second torque regulation instruction for triggering to decrease the target torque of the wind turbine generator system to the rated torque to a torque controller of the wind turbine generator system if the second wind speed is not greater than the wind speed threshold; or,
a second pitch angle acquisition module for acquiring a second average pitch angle within a fourth preset time duration when the fourth preset time duration is reached,
a third speed regulation instruction sending module, configured to send a third speed regulation instruction for triggering the target rotation speed of the wind turbine generator system to be increased to the rated rotation speed to a pitch controller of the wind turbine generator system if the second average pitch angle is not greater than the pitch angle threshold, and send a third torque regulation instruction for triggering the target torque of the wind turbine generator system to be decreased to the rated torque to a torque controller of the wind turbine generator system; or,
a third wind speed obtaining module, configured to obtain a third wind speed and a second average wind speed within a second preset duration when a fifth preset duration is reached,
a fourth speed regulation instruction sending module, configured to send a fourth speed regulation instruction for triggering to increase the target rotation speed of the wind turbine generator system to the rated rotation speed to a pitch controller of the wind turbine generator system and send a fourth torque regulation instruction for triggering to decrease the target torque of the wind turbine generator system to the rated torque to a torque controller of the wind turbine generator system if the third wind speed is not greater than the second average wind speed; or,
and the fifth speed regulation instruction sending module is used for sending a fifth speed regulation instruction for triggering the target rotating speed of the wind generating set to be increased to the rated rotating speed to a variable pitch controller of the wind generating set when a sixth preset time length is reached, and sending a fifth torque regulation instruction for triggering the target torque of the wind generating set to be reduced to the rated torque to a torque controller of the wind generating set.
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