Wind turbine generator set protection control method, device, main controller and medium

Abstract

The present application discloses a wind turbine protection control method, device, main controller, and medium, which belongs to the field of wind power generation. The method includes: obtaining the maximum blade root load based on the blade root load signal of the load sensor set at the blade root of each blade of the wind turbine; when the maximum blade root load is greater than the protection trigger threshold for a first preset time period, controlling the wind turbine to continuously perform a protection operation to reduce the blade root load; during the process of the wind turbine continuously performing the protection operation, if the maximum blade root load is less than the protection end threshold, controlling the wind turbine to maintain the current pitch angle operation, wherein the protection end threshold is less than the protection trigger threshold; after the wind turbine maintains the current pitch angle operation for a second preset time period, controlling the wind turbine to resume normal operation. According to the embodiments of the present application, the loss of power generation of the wind turbine can be reduced.

Description

Technical Field

[0001] The present application relates to the field of wind power generation, and in particular to a wind turbine generator protection control method, device, main controller and medium. Background Art

[0002] Wind turbines are devices that convert wind energy into electrical energy. Their operation is affected by actual wind conditions. If operating conditions exceed the turbine's design specifications, this can lead to operational risks. Therefore, protection and control strategies are necessary for wind turbines. However, existing protection and control strategies are susceptible to interference in identifying risks, leading to misjudgments and frequent wind turbine shutdowns, increasing power generation losses. Summary of the Invention

[0003] The embodiments of the present application provide a wind turbine generator protection control method, device, main controller and medium, which can reduce the loss of power generation of the wind turbine generator.

[0004] In a first aspect, an embodiment of the present application provides a wind turbine protection control method, comprising: obtaining a maximum blade root load based on a blade root load signal of a load sensor provided at the blade root of each blade of the wind turbine; when the maximum blade root load is greater than a protection trigger threshold value for a first preset time period, controlling the wind turbine to continuously perform a protection operation to reduce the blade root load; in the process of the wind turbine continuously performing the protection operation, if the maximum blade root load is less than a protection end threshold value, controlling the wind turbine to maintain operation at a current pitch angle, wherein the protection end threshold value is less than the protection trigger threshold value; after the wind turbine maintains operation at the current pitch angle for a second preset time period, controlling the wind turbine to resume normal operation.

[0005] In some possible embodiments, the method further includes: during the process of the wind turbine generator set continuously performing the protection operation, if the duration of the maximum blade root load being greater than or equal to the protection end threshold exceeds a third preset duration, controlling the wind turbine generator set to shut down.

[0006] In some possible embodiments, the method further includes: during the process of the wind turbine generator set continuously performing protection operations, if the maximum blade root load is greater than a danger threshold, controlling the wind turbine generator set to shut down, wherein the danger threshold is greater than a protection triggering threshold.

[0007] In some possible embodiments, the protection operation includes a variable torque operation and a pitch retraction operation.

[0008] In some possible embodiments, when the maximum load at the blade root is greater than the protection trigger threshold for a first preset time period, the wind turbine is controlled to continuously perform protection operations, including: when the maximum load at the blade root is greater than the protection trigger threshold for a first preset time period, a first control instruction is sent to the converter of the wind turbine, and a second control instruction is sent to the pitch system of the wind turbine, the first control instruction is used to control the converter to adjust the output to the generator of the wind turbine to increase or decrease the torque of the wind turbine, and the second control instruction is used to control the pitch system to retract the pitches.

[0009] In some possible embodiments, the method further includes: determining a protection triggering threshold value according to a limit load of normal operation of the wind turbine generator set and a preset bias coefficient.

[0010] In some possible embodiments, the maximum blade root load is obtained based on the blade root load signals of the load sensors arranged at the blade roots of each blade of the wind turbine generator set, including: obtaining the blade root load signals collected by the load sensors of each blade; obtaining the maximum absolute value of the signal values of each blade root load signal, and determining the maximum absolute value as the maximum blade root load of the blade.

[0011] In some possible embodiments, controlling the wind turbine generator set to maintain the current pitch angle includes: synchronously controlling each blade of the wind turbine generator set to maintain the current pitch angle.

[0012] In a second aspect, an embodiment of the present application provides a wind turbine protection control device, comprising: a signal processing module for obtaining a maximum blade root load based on a blade root load signal of a load sensor provided at the blade root of each blade of the wind turbine; a control module for: controlling the wind turbine to continuously perform protection operations to reduce the blade root load when the maximum blade root load is greater than a protection trigger threshold for a first preset period of time; controlling the wind turbine to maintain a current pitch angle operation if the maximum blade root load is less than a protection end threshold during the process of the wind turbine continuously performing the protection operation, wherein the protection end threshold is less than the protection trigger threshold; and controlling the wind turbine to resume normal operation after the wind turbine maintains the current pitch angle operation for a second preset period of time.

[0013] In a third aspect, an embodiment of the present application provides a main controller of a wind turbine generator set, comprising: a processor and a memory storing computer program instructions; when the processor executes the computer program instructions, the wind turbine generator set protection control method of the first aspect is implemented.

[0014] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having computer program instructions stored thereon. When the computer program instructions are executed by a processor, the wind turbine generator protection control method of the first aspect is implemented.

[0015] Embodiments of the present application provide a wind turbine generator protection control method, device, main controller, and medium. These methods can obtain a maximum blade root load on a blade based on a blade root load signal of each blade of the wind turbine generator obtained from a load sensor. Only when the maximum blade root load exceeds a protection trigger threshold for a first preset duration is the wind turbine generator controlled to continuously perform a protection operation to reduce the blade root load. The wind turbine generator is not immediately triggered to perform a protection operation when the maximum blade root load exceeds the protection trigger threshold, thereby avoiding misjudgment. While the wind turbine generator is continuously performing a protection operation, the maximum blade root load obtained based on the blade root load signals continuously obtained from the load sensors is compared with a protection termination threshold. If the maximum blade root load is less than the protection termination threshold, the wind turbine generator is not immediately controlled to resume normal operation. Instead, the wind turbine generator is controlled to maintain a current pitch angle to stabilize the blade root load of the wind turbine generator's blades. Only after the wind turbine generator maintains the current pitch angle for a second preset duration, i.e., after the blade root load of the wind turbine generator's blades stabilizes, is the wind turbine generator controlled to resume normal operation. In the embodiment of the present application, frequent shutdowns of the wind turbine generator set caused by misjudgment of risk can be avoided, thereby reducing the loss of power generation of the wind turbine generator set while protecting the safety of the wind turbine generator set. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 A flow chart of an embodiment of a wind turbine generator protection control method provided by the present application;

[0018] Figure 2 A flow chart of another embodiment of the wind turbine generator protection control method provided by the present application;

[0019] Figure 3 A flow chart of another embodiment of the wind turbine generator protection control method provided by the present application;

[0020] Figure 4 A schematic structural diagram of an embodiment of a wind turbine generator protection control device provided in this application;

[0021] Figure 5A schematic structural diagram of another embodiment of the wind turbine generator protection control device provided by the present application;

[0022] Figure 6 A schematic structural diagram of another embodiment of the wind turbine generator protection control device provided by the present application;

[0023] Figure 7 This is a structural diagram of an embodiment of a main controller of a wind turbine generator set provided in the third aspect of the present application. DETAILED DESCRIPTION

[0024] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present application by illustrating the examples of the present application.

[0025] Wind turbines are devices that convert wind energy into electrical energy. During operation, wind turbines are affected by actual wind conditions. For example, operating conditions outside the standard design range can lead to operational risks. Therefore, to improve wind turbine operational safety, protective control strategies are necessary. However, current protective control strategies are susceptible to interference in identifying risks, leading to misjudgments of operational risks, frequent wind turbine downtime, and increased power generation losses.

[0026] The embodiments of the present application provide a wind turbine protection control method, device, main controller and medium, which can more accurately judge the operating risks of the wind turbine, reduce misjudgments, and reduce the loss of wind turbine power generation.

[0027] In the embodiments of the present application, a wind turbine generator set has multiple blades, and a load sensor may be installed at the root of each blade. The number of load sensors installed at the root of each blade is not limited. The load sensor can collect load data at the blade root and transmit it to the main controller of the wind turbine generator set via a blade root load signal. The load data can represent the blade root load, and thus, the blade root load can be obtained based on the blade root load signal.

[0028] In a first aspect, the present application provides a wind turbine protection control method, which can be applied to a wind turbine protection control device or a main controller of a wind turbine, that is, the wind turbine protection control method can be executed by a wind turbine protection control device or a main controller of a wind turbine, and is not limited here. Figure 1 This is a flow chart of an embodiment of the wind turbine protection control method provided by this application. Figure 1 As shown, the wind turbine generator protection control method may include steps S101 to S104.

[0029] In step S101 , the maximum blade root load is obtained according to a blade root load signal from a load sensor provided at the blade root of each blade of the wind turbine generator set.

[0030] The blade root load signal from a load sensor represents the blade root load on the blade where the load sensor is located. The blade root load can be derived from the blade root load signal. A wind turbine has multiple blades, and the blade root loads on these blades may vary. To ensure safe operation of a wind turbine, the maximum blade root load among the multiple blades is used as a basis for determining whether the wind turbine presents an operational risk. The maximum blade root load is the maximum blade root load among the multiple blades.

[0031] In some examples, the blade root load signals collected by the load sensors of each blade can be obtained, and the maximum absolute value of each signal value of the blade root load signals can be obtained. This maximum absolute value is then determined as the maximum blade root load of the blade. The signal value of the blade root load signal can represent the blade root load. The maximum absolute value of the signal value is the maximum absolute value of the signal value. To further improve the accuracy and stability of the blade root maximum load, before obtaining the maximum absolute value of each signal, the blade root load signal can be filtered to remove interference and other signals. The absolute value of the peak value of the filtered blade root load signal is obtained, and the maximum value among the peak absolute values is determined as the maximum absolute value, i.e., the maximum blade root load. For example, to facilitate calculation of the maximum blade root load, an envelope curve can be drawn for the filtered blade root load signal. Specifically, the envelope curve of the blade root load signal can be obtained by connecting the peak points of the blade root load signal. The maximum absolute value of the points on the envelope curve is determined as the maximum absolute value, i.e., the maximum blade root load.

[0032] For example, a wind turbine generator set has three blades, and a load sensor is provided at the root of each blade. According to the blade root load signal 1, the blade root load signal 2, and the blade root load signal 3 transmitted by each load sensor to the wind turbine generator set protection control device or the main controller of the wind turbine generator set, the maximum absolute value M1 of the peak value of the blade root load signal 1, the maximum absolute value M2 of the peak value of the blade root load signal 2, and the maximum absolute value M3 of the peak value of the blade root load signal 3 can be obtained. The maximum value of M1, M2, and M3 is the maximum blade root load.

[0033] In step S102 , when the maximum load on the blade root is greater than the protection triggering threshold value for a first preset time period, the wind turbine generator set is controlled to continuously perform a protection operation to reduce the blade root load.

[0034] The protection trigger threshold is the critical value of the blade root load that triggers a protective action. It can be set based on the scenario, requirements, experience, etc., and is not limited here. For example, the protection trigger threshold can be a blade root torque value of 25,000 kNm. A maximum blade root load greater than the protection trigger threshold indicates that the blade root load is excessive and poses a certain risk. A maximum blade root load less than or equal to the protection trigger threshold indicates that the blade root load is normal and is essentially risk-free. In some examples, the protection trigger threshold can be pre-determined based on the wind turbine's normal operating limit load and a preset bias coefficient. The wind turbine's normal operating limit load is the maximum load that the wind turbine can withstand under normal operating conditions. It can be obtained based on the wind turbine's historical data or simulation results, and is not limited here. The difference between the wind turbine's normal operating limit load and the bias coefficient is the protection trigger threshold. The bias coefficient is a positive number and can be set based on the scenario, requirements, experience, etc., and is not limited here. By using the bias coefficient, a certain margin is left for the protection trigger threshold, thereby ensuring that when the maximum blade root load exceeds the protection trigger threshold, attention is paid to the blade root load risk, avoiding the situation where attention is not paid to the blade root load risk until the maximum blade root load exceeds the limit load for normal operation of the wind turbine, thereby further improving the safety of wind turbine operation.

[0035] In an embodiment of the present application, when the maximum blade root load exceeds the protection trigger threshold, the wind turbine generator set may not be immediately triggered to perform a protection operation. Instead, the wind turbine generator set may be controlled to continuously perform the protection operation when the maximum blade root load exceeds the protection threshold for a certain period of time. This avoids misjudgments caused by transient increases in the maximum blade root load due to signal instability or transient sudden changes. The protection operation includes an operation aimed at reducing the blade root load. If the maximum blade root load does not exceed the protection threshold for a first predetermined period of time, the wind turbine generator set is controlled to operate normally without performing the protection operation. In some embodiments, the protection operation may include a torque-variable operation and a pitch-retracting operation. The torque-variable operation can be used to increase or decrease the torque of the wind turbine generator set. The specific choice of increasing or decreasing the torque of the wind turbine generator set can be determined based on the method used to reduce the blade root load. For example, if the blade root load is reduced by reducing power, the torque-variable operation is specifically a torque-reduction operation, which reduces power by reducing torque, thereby reducing the blade root load. For another example, if the blade root load is reduced by reducing speed, the torque-variable operation is specifically a torque-increasing operation, which reduces speed by increasing torque, thereby reducing the blade root load. The retracting operation can be used to increase the minimum pitch angle of the blades of the wind turbine. The pitch angle of the blades of the wind turbine must be greater than or equal to the minimum pitch angle. That is, the retracting operation is used to increase the pitch angle of the blades of the wind turbine and reduce the blade root load by increasing the pitch angle.

[0036] The first preset duration can be set according to the scenario, requirements, experience, etc., and is not limited here. For example, the first preset duration can be 8 seconds.

[0037] In step S103 , when the wind turbine generator set continuously performs the protection operation, if the maximum blade root load is less than the protection end threshold, the wind turbine generator set is controlled to maintain the current pitch angle.

[0038] The protection termination threshold is the critical blade root load that triggers the termination of the protection operation. The protection termination threshold is less than the protection trigger threshold. The protection termination threshold can be set based on the scenario, requirements, experience, and other factors, and is not limited here. For example, the protection termination threshold can be 22,000 kNm.

[0039] While the wind turbine generator set continues to perform protection operations, the wind turbine generator set protection control device or the main controller of the wind turbine generator set continues to periodically obtain the maximum blade root load and compare the maximum blade root load with the protection end threshold. If the maximum blade root load is less than the protection end threshold, it means that the blade root load of the wind turbine generator set has basically returned to normal, and the wind turbine generator set can exit the protection operation. However, in order to ensure that the blade root load of the wind turbine generator set can be stably restored to normal, the wind turbine generator set can be controlled to maintain the current pitch angle operation to avoid the situation where the blade root load may rise again due to immediate restoration of normal operation. The current pitch angle is the pitch angle when the maximum blade root load drops to less than the protection end threshold during the process of the wind turbine generator set performing protection operations.

[0040] In the embodiment of the present application, collective pitch control (CPC) can be used to control the operation of the wind turbine. Specifically, each blade of the wind turbine can be synchronously controlled to maintain the current pitch angle, that is, multiple blades of the wind turbine are controlled in a unified manner.

[0041] If the maximum blade root load is greater than or equal to the protection end threshold, it means that the blade root load of the wind turbine generator set has not returned to normal, and the wind turbine generator set still needs to continue to perform protection operations to reduce the blade root load.

[0042] In step S104, after the wind turbine generator set maintains the current pitch angle for a second preset time period, the wind turbine generator set is controlled to resume normal operation.

[0043] In order to further ensure the safety of the operation of the wind turbine generator set, when the maximum blade root load is less than the protection end threshold, the wind turbine generator set may not be immediately controlled to operate in a normal operating state. Instead, the wind turbine generator set may be controlled to resume normal operation after maintaining the current pitch angle in step S103 for a certain period of time so that the blade root load of the wind turbine generator set's blades stabilizes.

[0044] The second preset time length can be set according to the scene, needs, experience, etc., and is not limited here. For example, the second preset time length can be 15 seconds.

[0045] In an embodiment of the present application, a maximum blade root load on a blade can be obtained based on a blade root load signal of each blade of the wind turbine generator set obtained from a load sensor. Only when the maximum blade root load exceeds a protection trigger threshold for a first preset time period is the wind turbine generator set controlled to continuously perform a protection operation to reduce the blade root load. The wind turbine generator set is not immediately triggered to perform a protection operation when the maximum blade root load exceeds the protection trigger threshold, thereby avoiding misjudgment. While the wind turbine generator set is continuously performing a protection operation, the maximum blade root load obtained based on the blade root load signal continuously obtained from the load sensor is compared with a protection termination threshold. If the maximum blade root load is less than the protection termination threshold, the wind turbine generator set is not immediately controlled to resume normal operation. Instead, the wind turbine generator set is controlled to maintain a current pitch angle to stabilize the blade root load of the wind turbine generator set's blades. Only after the wind turbine generator set maintains the current pitch angle for a second preset time period, i.e., after the blade root load of the wind turbine generator set's blades stabilizes, is the wind turbine generator set controlled to resume normal operation. In the embodiment of the present application, frequent shutdowns of the wind turbine generator set caused by misjudgment of risk can be avoided, thereby reducing the loss of power generation of the wind turbine generator set while protecting the safety of the wind turbine generator set.

[0046] In some embodiments, if the protection operation cannot effectively reduce the blade root load, a shutdown operation needs to be performed to ensure the safety of the wind turbine generator set. Figure 2 This is a flow chart of another embodiment of the wind turbine generator protection control method provided by the present application. Figure 2 and Figure 1 The difference is that Figure 2 The wind turbine generator protection control method shown may further include step S105 and step S106. Figure 2 Zhongyu Figure 1 For the specific contents of the same steps, please refer to the relevant descriptions in the above embodiments and will not be repeated here.

[0047] In step S105 , during the process of the wind turbine generator set continuously performing the protection operation, if the duration of the maximum blade root load being greater than or equal to the protection end threshold exceeds a third preset duration, the wind turbine generator set is controlled to shut down.

[0048] While the wind turbine generator set is continuously performing protection operations, the wind turbine generator set protection control device or the wind turbine generator set's main controller may continuously obtain blade root load signals from the load sensors, thereby continuously obtaining the maximum blade root load. If the obtained maximum blade root load does not drop below a protection termination threshold within a certain period of time, it indicates that there is still a significant risk to the operation of the wind turbine generator set. To ensure the safe operation of the wind turbine generator set, the wind turbine generator set is controlled to shut down.

[0049] The third preset time length can be set according to the scene, needs, experience, etc., and is not limited here. For example, the third preset time length can be 45 seconds.

[0050] In step S106 , when the wind turbine generator set continuously performs the protection operation, if the maximum blade root load is greater than the danger threshold, the wind turbine generator set is controlled to shut down.

[0051] The danger threshold is a critical value used to determine whether there is a greater risk in the blade root load of the wind turbine blades. The danger threshold is greater than the protection trigger threshold and can be set according to the scenario, requirements, and experience, and is not limited here. For example, the danger threshold may be 27500kNm. If the maximum blade root load is greater than the danger threshold, it means that there is a greater risk in the blade root load of the wind turbine blades. In order to ensure the safe operation of the wind turbine, the wind turbine is controlled to shut down. If the maximum blade root load is less than or equal to the danger threshold, it means that there is no greater risk in the blade root load of the wind turbine blades, and there is no need to temporarily control the wind turbine to shut down.

[0052] In some embodiments, the wind turbine generator set protection control device or the main controller of the wind turbine generator set may send control instructions to components in the wind turbine generator set related to the protection operation to implement the execution of the protection operation. Figure 3 This is a flow chart of another embodiment of the wind turbine generator protection control method provided in this application. Figure 3 and Figure 1 The difference is that Figure 1 Step S102 in the above example can be specifically broken down into Figure 3 Step S1021 in . Figure 3 Zhongyu Figure 1 For the specific contents of the same steps, please refer to the relevant descriptions in the above embodiments and will not be repeated here.

[0053] In step S1021, when the maximum blade root load is greater than the protection trigger threshold for a first preset time period, a first control instruction is sent to the converter of the wind turbine generator set, and a second control instruction is sent to the pitch system of the wind turbine generator set.

[0054] The first control instruction is used to control the converter to adjust the output to the generator of the wind turbine generator set to increase or decrease the torque of the wind turbine generator set. Specifically, the first control instruction can be used to control the converter to adjust the current or voltage output to the generator of the wind turbine generator set to increase or decrease the torque of the wind turbine generator set.

[0055] The second control instruction is used to control the pitch system to retract the blades to increase the pitch angle of each blade of the wind turbine. The second control instruction can control the pitch system to increase the minimum pitch angle of each blade, with the pitch angle of each blade being greater than or equal to the minimum pitch angle of that blade. In other words, the second control instruction can increase the pitch angle of each blade of the wind turbine. In response to the second control instruction, the pitch system can uniformly control the increase in the pitch angle of each blade.

[0056] Through the first control instruction and the second control instruction, measures are taken from two aspects of variable torque and variable pitch to reduce the blade root load, thereby promoting the reduction of the blade root load of the wind turbine generator set.

[0057] A second aspect of the present application provides a wind turbine generator protection control device. Figure 4 This is a schematic diagram of the structure of an embodiment of the wind turbine generator protection control device provided by this application. Figure 4 As shown, the wind turbine generator protection control device 200 may include a signal processing module 201 and a control module 202 .

[0058] The signal processing module 201 may be used to obtain a maximum blade root load based on a blade root load signal from a load sensor disposed at the blade root of each blade of the wind turbine generator set.

[0059] The control module 202 can be used to: control the wind turbine generator set to continuously perform protection operations to reduce the blade root load when the maximum blade root load is greater than the protection trigger threshold for a first preset time period; control the wind turbine generator set to maintain the current pitch angle operation if the maximum blade root load is less than the protection end threshold during the process of the wind turbine generator set continuously performing the protection operation, wherein the protection end threshold is less than the protection trigger threshold; and control the wind turbine generator set to resume normal operation after the wind turbine generator set maintains the current pitch angle operation for a second preset time period.

[0060] In some examples, protection operations may include variable torque operations and pitch retraction operations.

[0061] In an embodiment of the present application, a maximum blade root load on a blade can be obtained based on a blade root load signal of each blade of the wind turbine generator set obtained from a load sensor. Only when the maximum blade root load exceeds a protection trigger threshold for a first preset time period is the wind turbine generator set controlled to continuously perform a protection operation to reduce the blade root load. The wind turbine generator set is not immediately triggered to perform a protection operation when the maximum blade root load exceeds the protection trigger threshold, thereby avoiding misjudgment. While the wind turbine generator set is continuously performing a protection operation, the maximum blade root load obtained based on the blade root load signal continuously obtained from the load sensor is compared with a protection termination threshold. If the maximum blade root load is less than the protection termination threshold, the wind turbine generator set is not immediately controlled to resume normal operation. Instead, the wind turbine generator set is controlled to maintain a current pitch angle to stabilize the blade root load of the wind turbine generator set's blades. Only after the wind turbine generator set maintains the current pitch angle for a second preset time period, i.e., after the blade root load of the wind turbine generator set's blades stabilizes, is the wind turbine generator set controlled to resume normal operation. In the embodiment of the present application, frequent shutdowns of the wind turbine generator set caused by misjudgment of risk can be avoided, thereby reducing the loss of power generation of the wind turbine generator set while protecting the safety of the wind turbine generator set.

[0062] In some embodiments, the control module 202 may also be configured to control the wind turbine to shut down if the maximum blade root load is greater than or equal to the protection end threshold for a duration exceeding a third preset duration during the wind turbine's continuous protection operation.

[0063] In some embodiments, the control module 202 may also be configured to control the wind turbine to shut down if the maximum blade root load exceeds a danger threshold during the wind turbine's continuous protection operation, where the danger threshold is greater than a protection triggering threshold.

[0064] In some embodiments, the wind turbine generator protection control device 200 may send control instructions to components related to protection operations to control the wind turbine generator to perform protection operations. Figure 5 This is a structural schematic diagram of another embodiment of the wind turbine generator protection control device provided in this application. Figure 5 and Figure 4 The difference is that Figure 5 The wind turbine generator protection control device 200 shown may further include a sending module 203 . Figure 5 Zhongyu Figure 4 For the specific contents of the same structures, please refer to the relevant descriptions in the above embodiments and will not be repeated here.

[0065] The sending module 203 can be used to: when the maximum blade root load exceeds the protection trigger threshold for a first preset time period, send a first control instruction to the converter of the wind turbine generator set and send a second control instruction to the pitch system of the wind turbine generator set.

[0066] The first control instruction is used to control the converter to adjust the output to the generator of the wind turbine generator set to increase or decrease the torque of the wind turbine generator set. The second control instruction is used to control the pitch system to retract the pitch.

[0067] In some embodiments, the wind turbine generator protection control device 200 may pre-generate a protection triggering threshold value to facilitate subsequent comparison of the maximum blade root load with the protection triggering threshold value. Figure 6 This is a structural schematic diagram of another embodiment of the wind turbine generator protection control device provided by the present application. Figure 6 and Figure 4 The difference is that Figure 6 The wind turbine generator protection control device 200 shown may further include a threshold generating module 204 . Figure 6 Zhongyu Figure 4 For the specific contents of the same structures, please refer to the relevant descriptions in the above embodiments and will not be repeated here.

[0068] The threshold generation module 204 may be configured to determine a protection triggering threshold according to a limit load of normal operation of the wind turbine generator set and a preset bias coefficient.

[0069] In some embodiments, the signal processing module 201 may be used to: obtain blade root load signals collected by load sensors of each blade; obtain the maximum absolute value of each blade root load signal, and determine the maximum absolute value as the maximum blade root load of the blade.

[0070] In some embodiments, the control module 202 may be used to synchronously control the blades of the wind turbine generator set to maintain the current pitch angle.

[0071] The third aspect of the present application further provides a main controller of a wind turbine generator set. Figure 7 This is a structural diagram of an embodiment of the main controller of the wind turbine generator set provided in the third aspect of the present application. Figure 7 As shown, the main controller 300 of the wind turbine generator set includes a memory 301 , a processor 302 , and a computer program stored in the memory 301 and executable on the processor 302 .

[0072] In an example, the processor 302 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0073] The memory 301 may include a read-only memory (ROM), a random access memory (RAM), a magnetic disk storage medium device, an optical storage medium device, a flash memory device, an electrical, optical or other physical / tangible memory storage device. Therefore, generally, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., a memory device) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the wind turbine protection control method according to the embodiment of the present application.

[0074] The processor 302 runs a computer program corresponding to the executable program code by reading the executable program code stored in the memory 301 , so as to implement the wind turbine generator protection control method in the above embodiment.

[0075] In one example, the main controller 300 of the wind turbine generator set may further include a communication interface 303 and a bus 304. Figure 7 As shown, the memory 301 , the processor 302 , and the communication interface 303 are connected via a bus 304 and communicate with each other.

[0076] The communication interface 303 is mainly used to implement communication between the modules, devices, units and / or equipment in the embodiment of the present application. Input devices and / or output devices can also be connected through the communication interface 303.

[0077] The bus 304 includes hardware, software, or both, and couples the components of the wind turbine main controller 300 to each other. By way of example and not limitation, the bus 304 may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-E) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local Bus (VLB) bus, or other suitable buses, or a combination of two or more of these. Where appropriate, the bus 304 may include one or more buses. Although embodiments herein describe and illustrate a particular bus, this application contemplates any suitable bus or interconnect.

[0078] In a fourth aspect, the present application further provides a computer-readable storage medium having computer program instructions stored thereon. When the computer program instructions are executed by a processor, the wind turbine generator protection control method in the above-mentioned embodiment can be implemented, and the same technical effects can be achieved. To avoid repetition, the above-mentioned computer-readable storage medium may include a non-transitory computer-readable storage medium, such as a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc., and is not limited here.

[0079] It should be understood that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. For the device embodiment, main controller embodiment, and computer-readable storage medium embodiment, the relevant parts can be referred to the description part of the method embodiment. This application is not limited to the specific steps and structures described above and shown in the figures. Those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of this application. In addition, for the sake of brevity, a detailed description of known method technologies is omitted here.

[0080] Aspects of the present application have been described above with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to produce a machine so that these instructions executed via the processor of the computer or other programmable data processing device enable the implementation of the function / action specified in one or more boxes of the flowchart and / or block diagram. This processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor or a field programmable logic circuit. It is also understood that each box in the block diagram and / or the flowchart and the combination of the boxes in the block diagram and / or the flowchart can also be implemented by the dedicated hardware that performs the specified function or action, or can be implemented by the combination of dedicated hardware and computer instructions.

[0081] Those skilled in the art should understand that the above embodiments are illustrative rather than restrictive. Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Based on a study of the drawings, the specification and the claims, those skilled in the art should be able to understand and implement other variations of the disclosed embodiments. In the claims, the term "comprising" does not exclude other devices or steps; the quantifier "one" does not exclude a plurality; the terms "first" and "second" are used to identify names rather than to indicate any specific order. Any figure marks in the claims should not be understood as limiting the scope of protection. The functions of multiple parts appearing in the claims can be implemented by a separate hardware or software module. The fact that certain technical features appear in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

1. A wind turbine generator protection control method, characterized in that: include: Obtaining a maximum blade root load according to a blade root load signal from a load sensor disposed at the blade root of each blade of the wind turbine generator set; When the maximum load on the blade root is greater than the protection trigger threshold value for a first preset time period, controlling the wind turbine generator set to continuously perform a protection operation to reduce the blade root load; During the process of the wind turbine generator set continuously performing the protection operation, if the maximum blade root load is less than a protection end threshold, controlling the wind turbine generator set to maintain the current pitch angle operation, wherein the protection end threshold is less than the protection triggering threshold; After the wind turbine generator set maintains the current pitch angle operation for a second preset time period, the wind turbine generator set is controlled to resume normal operation.

2. The method according to claim 1, characterized in that Also includes: During the process of the wind turbine generator set continuously performing the protection operation, if the duration during which the maximum blade root load is greater than or equal to the protection end threshold exceeds a third preset duration, the wind turbine generator set is controlled to shut down.

3. The method according to claim 1, characterized in that Also includes: During the process of the wind turbine generator set continuously performing the protection operation, if the maximum load of the blade root is greater than the danger threshold, the wind turbine generator set is controlled to shut down, The danger threshold is greater than the protection trigger threshold.

4. The method according to claim 1, wherein The protection operation includes a torque changing operation and a propeller retracting operation.

5. The method according to claim 4, characterized in that When the maximum load on the blade root is greater than the protection triggering threshold value for a first preset time period, controlling the wind turbine generator set to continuously perform the protection operation includes: When the maximum load on the blade root is greater than the protection trigger threshold for a first preset time period, a first control instruction is sent to the converter of the wind turbine generator set, and a second control instruction is sent to the pitch system of the wind turbine generator set. The first control instruction is used to control the converter to adjust the output to the generator of the wind turbine generator set to increase or decrease the torque of the wind turbine generator set. The second control instruction is used to control the pitch system to retract the pitches.

6. The method according to claim 1, characterized in that Also includes: The protection triggering threshold is determined according to the limit load of the normal operation of the wind turbine generator set and a preset bias coefficient.

7. The method according to claim 1, characterized in that The step of obtaining the maximum blade root load according to the blade root load signal of the load sensor provided at the blade root of each blade of the wind turbine generator set includes: Obtaining the blade root load signal collected by the load sensor of each blade; The maximum absolute value of each signal value of the blade root load signal is obtained, and the maximum absolute value is determined as the blade root maximum load of the blade.

8. The method according to claim 1, characterized in that The controlling the wind turbine generator set to maintain the current pitch angle operation includes: The blades of the wind turbine generator set are synchronously controlled to maintain the current pitch angle.

9. A wind turbine generator protection control device, characterized in that: include: a signal processing module, configured to obtain a maximum blade root load based on a blade root load signal from a load sensor disposed at the blade root of each blade of the wind turbine generator set; Control module for: When the maximum load on the blade root is greater than the protection trigger threshold value for a first preset time period, controlling the wind turbine generator set to continuously perform a protection operation to reduce the blade root load; During the process of the wind turbine generator set continuously performing the protection operation, if the maximum blade root load is less than a protection end threshold, controlling the wind turbine generator set to maintain the current pitch angle operation, wherein the protection end threshold is less than the protection triggering threshold; as well as, After the wind turbine generator set maintains the current pitch angle operation for a second preset time period, the wind turbine generator set is controlled to resume normal operation.

10. A main controller of a wind turbine generator set, characterized in that: include: a processor and a memory storing computer program instructions; When the processor executes the computer program instructions, the wind turbine generator protection and control method according to any one of claims 1 to 8 is implemented.

11. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the wind turbine generator protection and control method according to any one of claims 1 to 8 is implemented.

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