Wind turbine and method and related device for overspeed control of a wind turbine rotor

Abstract

The application discloses a wind turbine and a method and related device for controlling overspeed of a blade wheel of the wind turbine. The method comprises: collecting a rotating speed of the blade wheel of the wind turbine in real time; determining that the rotating speed is greater than a preset rotating speed and the rotating speed is in an ascending state, and determining that the wind turbine has an overspeed risk of the blade wheel, at this time, an additional torque is determined according to the rotating speed and the preset rotating speed; so as to increase a rated torque of the wind turbine when the wind turbine is running, and make the rated torque increase the additional torque. It can be seen that the wind turbine has the overspeed risk of the blade wheel, the rotating speed of the blade wheel is reduced by increasing the rated torque of the wind turbine, on the basis that the torque response is faster and more effective than the variable pitch response, the risk of triggering the overspeed protection of the blade wheel to make the wind turbine emergency stop is greatly reduced, the operation reliability of the wind turbine is improved, and the power generation loss of the wind turbine is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of control, in particular to a wind turbine and a method for controlling overspeed of a rotor thereof and related devices. BACKGROUND

[0002] Currently, the speed of the rotor of the wind turbine is controlled by pitch after full load of the wind turbine. When the wind turbine experiences extreme conditions such as gust conditions or turbulent conditions, the slow response of the pitch leads to rapid rise of the speed. If the speed continues to exceed the set speed threshold for a period of time, the rotor overspeed protection is triggered to cause the wind turbine to shut down.

[0003] However, when the wind turbine is in an extreme condition, the emergency shutdown of the wind turbine causes a large vibration of the wind turbine, resulting in a loss of power generation of the wind turbine. Especially, as the rotor gradually increases, the response of the pitch becomes slower and slower when the wind turbine is in an extreme condition after full load, which aggravates the triggering of the rotor overspeed protection to cause the wind turbine to shut down, thereby aggravating the loss of power generation of the wind turbine. SUMMARY

[0004] Therefore, the embodiments of the present application provide a wind turbine and a method for controlling overspeed of a rotor thereof and related devices, which can greatly reduce the risk of triggering the rotor overspeed protection to cause the wind turbine to shut down, improve the operation reliability of the wind turbine, and thus greatly reduce the loss of power generation of the wind turbine.

[0005] In a first aspect, the embodiments of the present application provide a method for controlling overspeed of a rotor of a wind turbine, the method comprising:

[0006] obtaining the speed of the rotor of the wind turbine in real time;

[0007] if the speed is greater than a preset speed and the speed is in a rising state, determining an additional torque based on the speed and the preset speed, the preset speed being a speed threshold for measuring whether there is a risk of rotor overspeed, and the additional torque being greater than 0;

[0008] controlling the rated torque of the wind turbine to increase the additional torque when the wind turbine is running.

[0009] Optionally, the determination of the additional torque based on the speed and the preset speed comprises:

[0010] obtaining a speed deviation according to the speed and the preset speed;

[0011] adjusting the speed deviation by a preset linear controller to determine the additional torque, the preset linear controller comprising a preset proportional element and a preset integral element.

[0012] Optionally, the adjusting the speed deviation by the preset linear controller to determine the additional torque comprises:

[0013] The adjusting the speed deviation by the preset proportional gain in the preset proportional link and the preset integral gain in the preset integral link to determine the additional torque.

[0014] Optionally, the additional torque is less than a preset multiple of the rated torque, and the preset multiple is determined based on torque bearing performance of the wind turbine when the additional torque is increased.

[0015] Optionally, the real-time acquisition of the speed of the impeller of the wind turbine comprises:

[0016] The real-time acquisition of the speed of the impeller of the wind turbine is performed when the wind turbine is in an extreme working condition after full-load detection, and the extreme working condition comprises a gust working condition or a turbulent flow working condition.

[0017] Optionally, the method further comprises:

[0018] When the rated torque of the wind turbine is controlled to be increased by the additional torque, a first duration during which the speed is greater than the preset speed is recorded;

[0019] If the first duration is greater than a first preset time, the wind turbine is controlled to be shut down.

[0020] Optionally, the method further comprises:

[0021] When the speed is greater than the preset speed, a second duration during which the speed is greater than the preset speed is started to be recorded;

[0022] If the second duration is greater than a second preset time, the wind turbine is controlled to be shut down, and the second preset time is greater than the first preset time.

[0023] In a second aspect, an embodiment of the present application provides a device for controlling overspeed of an impeller of a wind turbine, and the device comprises an acquisition unit, a determination unit and a control unit.

[0024] The acquisition unit is configured to acquire, in real time, a speed of the impeller of the wind turbine.

[0025] The determination unit is configured to, if the speed is greater than a preset speed and the speed is in an ascending state, determine an additional torque based on the speed and the preset speed, the preset speed being a speed threshold for measuring whether there is a risk of overspeed of the impeller, and the additional torque being greater than 0.

[0026] The control unit is configured to, when the wind turbine is running, control the rated torque of the wind turbine to be increased by the additional torque.

[0027] Optionally, the determining unit comprises an obtaining subunit and a determining subunit.

[0028] The obtaining subunit is configured to obtain a speed deviation according to the rotating speed and the preset rotating speed.

[0029] The determining subunit is configured to determine the additional torque by adjusting the speed deviation through a preset linear controller, wherein the preset linear controller comprises a preset proportional element and a preset integral element.

[0030] Optionally, the determining subunit is configured to:

[0031] adjust the speed deviation based on a preset proportional gain in the preset proportional element and a preset integral gain in the preset integral element, and determine the additional torque.

[0032] Optionally, the additional torque is less than a preset multiple of the rated torque, and the preset multiple is determined based on torque bearing performance of the wind turbine when an additional torque is increased.

[0033] Optionally, the obtaining unit is configured to:

[0034] obtain the rotating speed of the impeller of the wind turbine in real time when the wind turbine is in an extreme working condition after full-load generation is detected, wherein the extreme working condition comprises a gust working condition or a turbulent flow working condition.

[0035] Optionally, the device further comprises a recording unit.

[0036] The recording unit is configured to record a first duration during which the rotating speed is greater than the preset rotating speed when the rated torque of the wind turbine is controlled to be increased by the additional torque.

[0037] The control unit is further configured to:

[0038] control the wind turbine to be shut down if the first duration is greater than a first preset time.

[0039] Optionally, the recording unit is further configured to:

[0040] start recording a second duration during which the rotating speed is greater than the preset rotating speed when the rotating speed is greater than the preset rotating speed.

[0041] The control unit is further configured to:

[0042] control the wind turbine to be shut down if the second duration is greater than a second preset time, wherein the second preset time is greater than the first preset time.

[0043] Optionally, the impeller overspeed control device is arranged in a variable pitch controller of the wind turbine.

[0044] In a third aspect, an embodiment of the present application provides a computer device, comprising a processor and a memory:

[0045] The memory is configured to store program code and transmit the program code to the processor.

[0046] The processor is configured to execute the wind turbine impeller overspeed control method according to the instructions in the program code.

[0047] Optionally, the computer device is a variable pitch controller of the wind turbine.

[0048] In a fourth aspect, an embodiment of the present application provides a computer readable storage medium, configured to store program code, wherein the program code is configured to execute the wind turbine impeller overspeed control method according to the first aspect.

[0049] In a fifth aspect, an embodiment of the present application provides a wind turbine, comprising the wind turbine impeller overspeed control device according to the second aspect, or the computer device according to the third aspect.

[0050] Compared with the prior art, the present application has at least the following advantages:

[0051] By adopting the technical solutions of the embodiments of the present application, the rotation speed of the impeller of the wind turbine is collected in real time; it is determined that the rotation speed is greater than the preset rotation speed and the rotation speed is in an ascending state, it is determined that the wind turbine has an impeller overspeed risk, at this time, the additional torque is determined according to the rotation speed and the preset rotation speed, wherein the preset rotation speed refers to a rotation speed threshold for measuring whether there is an impeller overspeed risk; so as to increase the rated torque of the wind turbine when the wind turbine is running, so that the rated torque increases by the additional torque. It can be seen that when it is determined that the wind turbine has an impeller overspeed risk, the rated torque of the wind turbine is increased, so that the rotation speed of the impeller decreases, on the basis that the torque response is faster and more effective than the variable pitch response, the risk of triggering the impeller overspeed protection to make the wind turbine emergency stop can be greatly reduced, the operation reliability of the wind turbine is improved, and the power generation loss of the wind turbine is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application or the prior art. Obviously, the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0053] Figure 1A system framework schematic diagram related to an application scenario in an embodiment of the present application;

[0054] Figure 2 A flowchart of a method for over-speed control of a wind turbine impeller provided in an embodiment of the present application;

[0055] Figure 3 A framework diagram of over-speed control of a wind turbine impeller provided in an embodiment of the present application;

[0056] Figure 4 A flowchart of another method for over-speed control of a wind turbine impeller provided in an embodiment of the present application;

[0057] Figure 5 A schematic diagram of over-speed control of a wind turbine impeller based on a double protection mechanism provided in an embodiment of the present application;

[0058] Figure 6 A structural schematic diagram of an apparatus for over-speed control of a wind turbine impeller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0059] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor fall within the scope of protection of the present application.

[0060] In the related art, the speed of the wind turbine impeller is controlled by pitch after the wind turbine is full-load, and when the wind turbine experiences extreme conditions such as gust conditions or turbulent conditions, the slow response of the pitch leads to rapid rise of the speed, and if the speed continues to exceed the set speed threshold for a period of time, the over-speed protection of the impeller is triggered to make the wind turbine emergency stop. However, the inventors have found through research that the emergency stop of the wind turbine causes the wind turbine to vibrate greatly, the key components of the wind turbine and the tower load are large, and the power generation of the wind turbine is lost. Especially, as the impeller gradually increases, the pitch response is slower and slower when the wind turbine is full-load in extreme conditions, which aggravates the triggering of the over-speed protection of the impeller to make the wind turbine emergency stop, thereby aggravating the loss of power generation of the wind turbine.

[0061] To solve this problem, in the embodiment of the present application, the rotating speed of the impeller of the wind turbine generator is collected in real time; it is determined that the rotating speed is greater than the preset rotating speed and the rotating speed is in an ascending state, it is determined that the wind turbine generator has an impeller overspeed risk, at this time, the additional torque is determined according to the rotating speed and the preset rotating speed, wherein the preset rotating speed refers to a rotating speed threshold for measuring whether there is an impeller overspeed risk; so as to increase the rated torque of the wind turbine generator when the wind turbine generator is running, so that the rated torque increases by the additional torque. It can be seen that when it is determined that the wind turbine generator has an impeller overspeed risk, the rotating speed of the impeller can be reduced by increasing the rated torque of the wind turbine generator. On the basis that the torque response is faster and more effective than the pitch response, the risk of triggering the impeller overspeed protection to make the wind turbine generator emergency stop can be greatly reduced, the operation reliability of the wind turbine generator is improved, and the power generation loss of the wind turbine generator is greatly reduced.

[0062] For example, one of the scenarios of the embodiment of the present application can be applied to the scenario as shown in Figure 1 The scenario includes an impeller 101 of a wind turbine generator and a pitch controller 102, which implements the overspeed control of the impeller 101 by using the implementation manner of the impeller overspeed control method provided by the embodiment of the present application.

[0063] Firstly, in the above application scenario, although the actions of the implementation manner provided by the embodiment of the present application are executed by the pitch controller 102; however, the embodiment of the present application is not limited in the execution subject, as long as the actions disclosed by the implementation manner provided by the embodiment of the present application are executed.

[0064] Secondly, the above scenario is only one scenario example provided by the embodiment of the present application, and the embodiment of the present application is not limited to this scenario.

[0065] The specific implementation manner of the wind turbine generator and the impeller overspeed control method and device thereof in the embodiment of the present application will be described in detail in combination with the drawings and embodiments.

[0066] Exemplary method

[0067] Referring to Figure 2 , a flowchart of an impeller overspeed control method of a wind turbine generator in the embodiment of the present application is shown. In the embodiment, the method may, for example, include the following steps:

[0068] Step 201: Real-time acquisition of the rotating speed of the impeller of the wind turbine generator.

[0069] In the embodiment of the present application, the rotating speed of the impeller of the wind turbine generator needs to be controlled under certain conditions during the operation of the wind turbine generator; and the premise of controlling the rotating speed of the impeller of the wind turbine generator is to acquire the rotating speed of the impeller of the wind turbine generator in real time.

[0070] In the step 201, when the wind turbine is in an extreme condition such as a gust condition or a turbulent flow condition after full-load operation, the slow response of the pitch control results in a rapid increase of the rotating speed of the impeller. Therefore, it is particularly necessary to obtain the rotating speed of the impeller in real time, so as to perform the rotating speed control based on the obtained rotating speed. Therefore, in an optional embodiment of the present application, the step 201 can include, for example, obtaining the rotating speed of the impeller in real time when the wind turbine is in an extreme condition such as a gust condition or a turbulent flow condition after full-load operation.

[0071] In the step 202, if the rotating speed is greater than the preset rotating speed and the rotating speed is in an increasing state, an additional torque is determined based on the rotating speed and the preset rotating speed. The preset rotating speed is a rotating speed threshold for measuring whether there is a risk of over-speed of the impeller. The additional torque is greater than 0.

[0072] When the rotating speed of the impeller of the wind turbine continuously exceeds the set rotating speed threshold for a period of time, the over-speed protection of the impeller is triggered, and the wind turbine is stopped urgently. However, when the wind turbine is in an extreme condition, the urgent stop of the wind turbine causes a large vibration of the wind turbine, and the power generation of the wind turbine is lost. Especially, as the impeller gradually increases, when the wind turbine is in an extreme condition such as a gust condition or a turbulent flow condition after full-load operation, the pitch control response is slower and slower, which aggravates the phenomenon that the over-speed protection of the impeller is triggered and the wind turbine is stopped urgently, thereby aggravating the loss of the power generation of the wind turbine.

[0073] In the present application, the set rotating speed threshold is used as the preset rotating speed for measuring whether there is a risk of over-speed of the impeller. When the rotating speed of the impeller of the wind turbine is greater than the preset rotating speed and the rotating speed is in an increasing state, it indicates that there is a risk of over-speed of the impeller, that is, the over-speed protection of the impeller is likely to be triggered and the wind turbine is stopped urgently. In order to avoid the phenomenon that the rotating speed of the impeller of the wind turbine continuously exceeds the preset rotating speed for a period of time, the over-speed protection of the impeller is triggered and the wind turbine is stopped urgently, the over-speed control of the impeller of the wind turbine is needed to make the rotating speed of the impeller decrease. The rotating speed in an increasing state can be represented as an acceleration corresponding to the rotating speed being greater than 0.

[0074] Considering that the aerodynamic power of the impeller is equal to the product of the torque and the rotating speed, the rotating speed of the impeller can be decreased by increasing the rated torque of the wind turbine. Therefore, the additional torque needed to be additionally increased to make the rotating speed of the impeller decrease can be determined as the additional torque based on the rotating speed and the preset rotating speed. The additional torque is necessarily greater than 0.

[0075] In the implementation of step 202, on the basis of the preset rotating speed being a rotating speed threshold for measuring whether there is a risk of over-speed of the impeller, the additional torque first needs to calculate a deviation of the rotating speed from the preset rotating speed as a rotating speed deviation; then, the additional torque corresponding to the rotating speed deviation is obtained by adjusting the rotating speed deviation through a preset linear controller, so that the additional torque corresponding to the rotating speed deviation is obtained; wherein the preset linear controller is a preset proportional element for realizing proportional adjustment and a preset integral element for realizing integral adjustment. Therefore, in an optional embodiment of the present application, the step 202 may, for example, include the following steps A-B:

[0076] Step A: obtaining a rotating speed deviation according to the rotating speed and the preset rotating speed.

[0077] Step B: adjusting the rotating speed deviation through a preset linear controller to determine the additional torque, wherein the preset linear controller includes a preset proportional element and a preset integral element.

[0078] In the implementation of step B, the preset proportional element in the preset linear controller for realizing proportional adjustment is preset with a proportional gain as a preset proportional gain; and the preset integral element in the preset linear controller for realizing integral adjustment is preset with an integral gain as a preset integral gain; the adjustment of the rotating speed deviation through the preset linear controller actually means the adjustment of the rotating speed deviation through the preset proportional gain in the preset proportional element and the preset integral gain in the preset integral element, so that the additional torque corresponding to the rotating speed deviation is obtained. Therefore, in an optional embodiment of the present application, the step B may, for example, include: adjusting the rotating speed deviation based on the preset proportional gain in the preset proportional element and the preset integral gain in the preset integral element to determine the additional torque.

[0079] In the present application, the additional torque determined by the rotating speed and the preset rotating speed has a certain upper limit, for example, on the basis of the rated torque being known, the additional torque can be represented as less than a preset multiple of the rated torque; that is, the sum of the rated torque and the preset multiple of the rated torque represents the limit of the torque bearing performance of the wind turbine when the additional torque is increased. Therefore, in an optional embodiment of the present application, the additional torque is less than a preset multiple of the rated torque, and the preset multiple is determined based on the torque bearing performance of the wind turbine when the additional torque is increased.

[0080] Step 203: increasing the rated torque of the wind turbine by the additional torque when the wind turbine is running.

[0081] In the embodiment of the present application, after the additional torque is determined in step 202, during the operation of the wind turbine, the additional torque needs to be added to the rated torque to increase the rated torque of the wind turbine, so that the rotating speed of the impeller is reduced, thereby avoiding the phenomenon that the rotating speed of the impeller of the wind turbine continuously exceeds the preset rotating speed for a period of time, triggering the impeller overspeed protection to make the wind turbine emergency stop.

[0082] As an example, a framework diagram of an impeller overspeed control of a wind turbine is shown in Figure 3 In the framework diagram, when the rotating speed w is greater than the preset rotating speed Wset1 and the rotating speed w is in the rising state, the rotating speed deviation is obtained according to the rotating speed w and the preset rotating speed Wset1, and the additional torque AT is determined by adjusting the rotating speed deviation through the preset linear controller PI; so that when the wind turbine is running, the rated torque Tn of the wind turbine is controlled to increase the additional torque AT, thereby controlling the rotating speed w to decrease.

[0083] Through various embodiments provided by the embodiment, the rotating speed of the impeller of the wind turbine is collected in real time; it is determined that the rotating speed is greater than the preset rotating speed and the rotating speed is in the rising state, it is determined that the wind turbine has an impeller overspeed risk, at this time, the additional torque is determined by the rotating speed and the preset rotating speed, wherein the preset rotating speed refers to a rotating speed threshold for measuring whether there is an impeller overspeed risk; so that when the wind turbine is running, the rated torque of the wind turbine is increased, so that the rated torque increases the additional torque. It can be seen that when it is determined that the wind turbine has an impeller overspeed risk, the rotating speed of the impeller can be reduced by increasing the rated torque of the wind turbine. On the basis that the torque response is faster and more effective than the variable pitch response, the risk of triggering the impeller overspeed protection to make the wind turbine emergency stop can be greatly reduced, the operation reliability of the wind turbine is improved, and the power generation loss of the wind turbine is greatly reduced.

[0084] On the basis of the above-mentioned embodiment, the rotating speed of the impeller is controlled to decrease in order to avoid the phenomenon that the rotating speed of the impeller of the wind turbine continuously exceeds the preset rotating speed for a period of time, triggering the impeller overspeed protection to make the wind turbine emergency stop; however, for controlling the rated torque of the wind turbine to increase the additional torque, there may be a case that the rotating speed is still greater than the preset rotating speed, then the duration that the rotating speed is greater than the preset rotating speed needs to be recorded as a first duration, it is determined that the first duration is greater than a first preset time, which indicates that even if the rated torque of the wind turbine is increased, the rotating speed still continuously exceeds the preset rotating speed for a certain time, at this time, the impeller overspeed protection still needs to be triggered to control the wind turbine to emergency stop.

[0085] Referring to Figure 4, shows a flow diagram of another method for controlling overspeed of a wind turbine in embodiments of the present application. In this embodiment, the method may, for example, include the following steps:

[0086] Step 401: Real-time acquisition of the rotational speed of the wind turbine impeller.

[0087] Step 402: If the rotational speed is greater than the preset rotational speed and the rotational speed is in an ascending state, determining an additional torque based on the rotational speed and the preset rotational speed; the preset rotational speed refers to a rotational speed threshold for measuring whether there is a risk of impeller overspeed, and the additional torque is greater than 0.

[0088] Step 403: Controlling the rated torque of the wind turbine to increase by the additional torque while the wind turbine is running.

[0089] In embodiments of the present application, steps 401-403 are the same as steps 201-203 in the above embodiment; therefore, the specific implementation of steps 401-403 can be referred to the specific implementation of steps 201-203 in the above embodiment, which will not be described here.

[0090] Step 404: Recording a first duration of the rotational speed being greater than the preset rotational speed while controlling the rated torque of the wind turbine to increase by the additional torque.

[0091] Step 405: If the first duration is greater than a first preset time, controlling the wind turbine to shut down.

[0092] In addition, in embodiments of the present application, in order to avoid the rotational speed of the wind turbine impeller being greater than the preset rotational speed for a long time, a double impeller overspeed protection mechanism needs to be set based on the above control of the wind turbine shutdown. Then, according to the principle that the rotational speed of the wind turbine impeller exceeds the set rotational speed threshold for a period of time, triggering the impeller overspeed protection to make the wind turbine shut down urgently, when the rotational speed of the wind turbine impeller is greater than the preset rotational speed, the duration of the rotational speed being greater than the preset rotational speed can be recorded as a second duration, and when the second duration is greater than a second preset time, the impeller overspeed protection needs to be triggered to control the wind turbine to shut down urgently. Since the time node at which the second duration starts recording is earlier than the time node at which the first duration starts recording, the corresponding second preset time needs to be greater than the first preset time. Therefore, in an optional implementation of the present application, the method may further include:

[0093] Step 406: Starting to record a second duration of the rotational speed being greater than the preset rotational speed when the rotational speed is greater than the preset rotational speed.

[0094] Step 407: If the second duration is greater than the second preset time, control the wind turbine to stop, where the second preset time is greater than the first preset time.

[0095] As an example, such as Figure 5 The diagram illustrates a wind turbine rotor overspeed control system based on a dual protection mechanism. The system involves: acquiring the rotor speed in real-time; determining if the speed exceeds a preset speed (a threshold speed used to assess the risk of rotor overspeed); if so, determining if the speed is increasing; and if so, determining an additional torque based on the speed and the preset speed. During wind turbine operation, the rated torque of the wind turbine is increased by the additional torque, ensuring the additional torque is greater than zero. While increasing the rated torque, a first duration of the speed exceeding the preset speed is recorded. The system then determines if this first duration exceeds a first preset time; if so, the wind turbine is shut down. Furthermore, upon determining that the speed exceeds the preset speed, a second duration of the speed exceeding the preset speed is recorded; this second duration exceeds a second preset time, and if so, the wind turbine is shut down.

[0096] Through the various implementation methods provided in this embodiment, the rotor speed of the wind turbine is collected in real time. If the rotor speed is found to be greater than a preset speed and increasing, it is determined that there is a risk of rotor overspeed in the wind turbine. At this point, an additional torque is determined by comparing the rotor speed with the preset speed, where the preset speed is a threshold speed used to measure the presence of rotor overspeed risk. This allows the rated torque of the wind turbine to be increased during operation, thereby increasing the rated torque with the additional torque. Furthermore, when increasing the additional torque, the first duration for which the rotor speed is greater than the preset speed is recorded. If the first duration exceeds a first preset time, the rotor overspeed protection control shuts down the wind turbine.

[0097] It is evident that when a wind turbine is deemed to have a risk of rotor overspeed, increasing the turbine's rated torque can reduce the rotor speed. Since torque response is faster and more efficient than pitch response, this significantly reduces the risk of triggering rotor overspeed protection and causing an emergency shutdown of the wind turbine, improving operational reliability and thus substantially reducing power generation loss. However, even when the rated torque is increased, if the rotor speed continues to exceed the preset speed for a certain period, rotor overspeed protection will still be triggered, causing an emergency shutdown of the wind turbine to protect it.

[0098] Exemplary device

[0099] See Figure 6, shows a structural schematic diagram of a wind turbine impeller overspeed control device in the embodiment of the application. In the embodiment, the device may, for example, specifically include an acquisition unit 601, a determination unit 602, and a control unit 603.

[0100] The acquisition unit 601 is configured to acquire the rotating speed of the wind turbine impeller in real time.

[0101] The determination unit 602 is configured to determine an additional torque based on the rotating speed and a preset rotating speed if the rotating speed is greater than the preset rotating speed and the rotating speed is in an ascending state. The preset rotating speed refers to a rotating speed threshold for measuring whether there is an impeller overspeed risk, and the additional torque is greater than 0.

[0102] The control unit 603 is configured to control the rated torque of the wind turbine to increase by the additional torque when the wind turbine is running.

[0103] In an optional implementation of the embodiment of the application, the determination unit 602 includes an obtaining subunit and a determination subunit.

[0104] The obtaining subunit is configured to obtain a rotating speed deviation according to the rotating speed and the preset rotating speed.

[0105] The determination subunit is configured to adjust the rotating speed deviation by a preset linear controller to determine the additional torque, wherein the preset linear controller includes a preset proportional element and a preset integral element.

[0106] In an optional implementation of the embodiment of the application, the determination subunit is configured to:

[0107] adjust the rotating speed deviation based on a preset proportional gain in the preset proportional element and a preset integral gain in the preset integral element to determine the additional torque.

[0108] In an optional implementation of the embodiment of the application, the additional torque is less than a preset multiple of the rated torque, and the preset multiple is determined based on the torque bearing performance of the wind turbine when the additional torque is increased.

[0109] In an optional implementation of the embodiment of the application, the acquisition unit 601 is configured to:

[0110] acquire the rotating speed of the wind turbine impeller in real time when the wind turbine is detected to be in an extreme working condition after full-load generation, wherein the extreme working condition includes a gust working condition or a turbulent flow working condition.

[0111] In an optional implementation of the embodiment of the application, the device further includes a recording unit.

[0112] the recording unit is configured to record a first duration during which the rotating speed is greater than the preset rotating speed when the rated torque of the wind turbine is controlled to increase the additional torque;

[0113] The control unit is further configured to:

[0114] If the first duration is greater than a first preset time, the wind turbine is controlled to shut down.

[0115] In an optional embodiment of the wind turbine overspeed control method, the recording unit is further configured to:

[0116] When the rotating speed is greater than the preset rotating speed, a second duration during which the rotating speed is greater than the preset rotating speed is recorded.

[0117] The control unit is further configured to:

[0118] If the second duration is greater than a second preset time, the wind turbine is controlled to shut down, and the second preset time is greater than the first preset time.

[0119] In an optional embodiment of the wind turbine overspeed control method, the impeller overspeed control device is arranged in a variable pitch controller of the wind turbine.

[0120] According to the various embodiments provided in the embodiment, the rotating speed of the impeller of the wind turbine is collected in real time; it is determined that the rotating speed is greater than a preset rotating speed and the rotating speed is in an ascending state, it is determined that the wind turbine has an impeller overspeed risk, at this time, the additional torque is determined according to the rotating speed and the preset rotating speed, wherein the preset rotating speed refers to a rotating speed threshold for measuring whether there is an impeller overspeed risk; so as to increase the rated torque of the wind turbine when the wind turbine is running, so that the rated torque increases by the additional torque. It can be seen that when it is determined that the wind turbine has an impeller overspeed risk, the rotating speed of the impeller can be reduced by increasing the rated torque of the wind turbine, on the basis that the torque response is faster and more effective than the variable pitch response, the risk of triggering the impeller overspeed protection to make the wind turbine shut down urgently can be greatly reduced, the operation reliability of the wind turbine is improved, and the power generation loss of the wind turbine is greatly reduced.

[0121] In addition, the present application also provides a computer device, which comprises a processor and a memory:

[0122] The memory is configured to store program code and transmit the program code to the processor;

[0123] The processor is configured to execute the wind turbine overspeed control method according to the instructions in the program code.

[0124] In an optional implementation of the embodiment of the application, the computer device is a pitch controller of the wind turbine generator.

[0125] The embodiment of the application further provides a computer readable storage medium for storing program codes, the program codes being used for executing the wind turbine generator overspeed control method in the method embodiment.

[0126] The embodiment of the application further provides a wind turbine generator comprising the wind turbine generator overspeed control device in the device embodiment or comprising the computer device in the embodiment.

[0127] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0128] The skilled person can further realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed in the present application can be realized in electronic hardware, computer software or combination of both. In order to clearly show the interchangeability of hardware and software, the components and steps of the examples have been described in general in the above description. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0129] It should be noted that, in the present application, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between the entities or operations. The terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0130] The above descriptions are only the preferred embodiments of the present application, not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art, without departing from the technical solution of the present application, can make many possible changes and modifications to the technical content disclosed above, or modify equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solution of the present application, are still within the scope of protection of the present application.

Claims

1. A method of overspeed control of a wind turbine rotor, characterized in that, The method comprises: obtaining the rotating speed of the impeller of the wind turbine in real time; if the rotating speed is greater than a preset rotating speed and the rotating speed is in an ascending state, determining an additional torque based on the rotating speed and the preset rotating speed; the preset rotating speed refers to a rotating speed threshold for measuring whether there is a risk of impeller overspeed, and the additional torque is greater than 0; wherein the rotating speed being in an ascending state means that the acceleration corresponding to the rotating speed is greater than 0; when the wind turbine is running, increasing the rated torque of the wind turbine by the additional torque; the method further comprises: when the rated torque of the wind turbine is controlled to increase by the additional torque, recording a first duration for which the rotating speed is greater than the preset rotating speed; if the first duration is greater than a first preset time, controlling the wind turbine to shut down.

2. The method of claim 1, wherein, The method further comprises: obtaining the rotating speed of the impeller of the wind turbine in real time; if the rotating speed is greater than a preset rotating speed and the rotating speed is in an ascending state, determining an additional torque based on the rotating speed and the preset rotating speed; 3. The method of claim 2, wherein, the preset rotating speed refers to a rotating speed threshold for measuring whether there is a risk of impeller overspeed, and the additional torque is greater than 0; wherein the rotating speed being in an ascending state means that the acceleration corresponding to the rotating speed is greater than 0; when the wind turbine is running, increasing the rated torque of the wind turbine by the additional torque; 4. The method according to any one of claims 1 to 3, characterized in that, the method further comprises:

5. The method of claim 1, wherein, when the rated torque of the wind turbine is controlled to increase by the additional torque, recording a first duration for which the rotating speed is greater than the preset rotating speed; if the first duration is greater than a first preset time, controlling the wind turbine to shut down.

6. The method of claim 1, wherein, The method further comprises: obtaining the rotating speed of the impeller of the wind turbine in real time; if the rotating speed is greater than a preset rotating speed and the rotating speed is in an ascending state, determining an additional torque based on the rotating speed and the preset rotating speed; 7. A wind turbine over-speed control device for a wind turbine, comprising: the preset rotating speed refers to a rotating speed threshold for measuring whether there is a risk of impeller overspeed, and the additional torque is greater than 0; wherein the rotating speed being in an ascending state means that the acceleration corresponding to the rotating speed is greater than 0; when the wind turbine is running, increasing the rated torque of the wind turbine by the additional torque; the method further comprises: when the rated torque of the wind turbine is controlled to increase by the additional torque, recording a first duration for which the rotating speed is greater than the preset rotating speed; if the first duration is greater than a first preset time, controlling the wind turbine to shut down. The method further comprises: obtaining the rotating speed of the impeller of the wind turbine in real time; if the rotating speed is greater than a preset rotating speed and the rotating speed is in an ascending state, determining an additional torque based on the rotating speed and the preset rotating speed; the preset rotating speed refers to a rotating speed threshold for measuring whether there is a risk of impeller overspeed, and the additional torque is greater than 0; wherein the rotating speed being in an ascending state means that the acceleration corresponding to the rotating speed is greater than 0; 8. The wind turbine over-speed control apparatus of claim 7, wherein, when the wind turbine is running, increasing the rated torque of the wind turbine by the additional torque; the method further comprises: when the rated torque of the wind turbine is controlled to increase by the additional torque, recording a first duration for which the rotating speed is greater than the preset rotating speed; if the first duration is greater than a first preset time, controlling the wind turbine to shut down. The wind turbine overspeed control device is arranged in a variable pitch controller of the wind turbine.

9. A computer device, comprising: The computer device comprises a processor and a memory: The memory is configured to store program code and transmit the program code to the processor; The processor is configured to execute the wind turbine impeller overspeed control method according to the instructions in the program code.

10. The computer device of claim 9, wherein, The computer device is a variable pitch controller of a wind turbine.

11. A computer readable storage medium, characterized in that, The computer readable storage medium is configured to store program code, and the program code is configured to execute the wind turbine impeller overspeed control method.

12. A wind turbine generator characterized by, The wind turbine impeller overspeed control device of claim 7 or 8, or the computer device of claim 9 or 10.

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