Emergency shutdown and load reduction control method, device, electronic equipment and medium for wind turbine

Abstract

The present invention provides a method, device, electronic device and medium for emergency shutdown and load reduction control of a wind turbine, which are used to solve the problem that the safety and service life of the wind turbine are seriously affected when the wind turbine undergoes an emergency shutdown in the prior art, and belong to the field of shutdown and load reduction control. The method includes receiving an emergency shutdown signal instruction; obtaining the fault information of the wind turbine; judging the fault level of the fault signal; when the fault level is the first level, controlling the converter system to immediately disconnect from the grid and controlling the pitch system to retract the blades at a preset constant pitch rate; when the fault level is the second level, determining the load level of the wind turbine; determining the off-grid torque reduction rate of the converter system, as well as the segmented pitch rate and segmented pitch time of the pitch system; controlling the converter system to flexibly disconnect from the grid and controlling the pitch system to retract the blades at a variable rate. Through the above technical solution, the present invention can improve the safety and service life of the wind turbine.

Description

Technical Field

[0001] The present invention relates to the field of shutdown and load reduction control, and particularly to an emergency shutdown and load reduction control method for a wind turbine, an emergency shutdown and load reduction control device for a wind turbine, an electronic device, and a computer-readable storage medium. Background Art

[0002] With the continuous increase in the capacity of wind turbines, the blades are getting longer and the towers are getting taller. During the operation of wind turbines, the blades and towers will bear greater loads, and the impact force during the shutdown process often results in a large ultimate load. In particular, the impact force on the wind turbine during an emergency shutdown is even greater.

[0003] In the prior art, the control strategy for emergency shutdown is usually that the converter directly disconnects from the grid, and the blades are feathered at the maximum speed. According to the principle of aerodynamics, when disconnecting from the grid and feathering in the above manner, the sudden change in aerodynamic force during the emergency shutdown process will cause a large load impact on the blade root and the tower bottom, thus seriously affecting the safety and service life of the wind turbine. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide an emergency shutdown and load reduction control method, device, system, and medium for a wind turbine, which are used to at least solve the problem that when a wind turbine undergoes an emergency shutdown in the prior art, the blades and the tower bear large loads, thus seriously affecting the safety and service life of the wind turbine.

[0005] To achieve the above purpose, the first aspect of the present invention provides an emergency shutdown and load reduction control method for a wind turbine, the method comprising:

[0006] Respond to an emergency shutdown signal instruction to obtain the fault information of the wind turbine;

[0007] Judge the fault level of the wind turbine according to the fault information, where the fault level includes a first level and a second level;

[0008] When the fault level is the first level, control the converter system to directly disconnect from the grid, and control the pitch system to feather at a preset constant pitch rate;

[0009] When the fault level is the second level, determine the load level of the wind turbine, determine the disconnection torque reduction rate of the converter system, the segmented pitch rate and the segmented pitch time of the pitch system according to the load level, control the converter system to flexibly disconnect from the grid according to the disconnection torque reduction rate, and control the pitch system to feather at a variable rate according to the segmented pitch rate and the segmented pitch time.

[0010] Further, the determining the load level of the wind turbine includes:

[0011] Obtain the operation data of the wind turbine generator set;

[0012] Determine the load of the operating components of the wind turbine generator set according to the operation data;

[0013] Determine the load level of the wind turbine generator set according to the weighted sum of the loads of the operating components.

[0014] Furthermore, the operation data includes wind speed, rotational speed, pitch angle, fore-and-aft acceleration of the nacelle, and left-and-right acceleration of the nacelle;

[0015] The loads of the operating components include the X-direction load at the blade root, the Z-direction load at the blade root, the X-direction load at the bottom of the tower, and the Y-direction load at the bottom of the tower.

[0016] Furthermore, determining the load level of the wind turbine generator set further includes:

[0017] Mx_blade = G1(V, w, β, a_fa, a_ss)

[0018] Mz_blade = G2(V, w, β, a_fa, a_ss)

[0019] Mx_tower = G3(V, w, β, a_fa, a_ss)

[0020] My_tower = G4(V, w, β, a_fa, a_ss)

[0021] M_total = K1 * Mx_blade + K2 * Mz_blade + K3 * Mx_tower + K4 * My_tower;

[0022] Wherein, V represents the wind speed, w represents the rotational speed, β represents the pitch angle, a_fa represents the fore-and-aft acceleration of the nacelle, a_ss represents the left-and-right acceleration of the nacelle, Mx_blade represents the X-direction load at the blade root, Mz_blade represents the Z-direction load at the blade root, Mx_tower represents the X-direction load at the bottom of the tower, My_tower represents the Y-direction load at the bottom of the tower, M_total represents the load level, G() represents an empirical function, K1 represents the weighting coefficient of the X-direction load at the blade root, K2 represents the weighting coefficient of the Z-direction load at the blade root, K3 represents the weighting coefficient of the X-direction load at the bottom of the tower, and K4 represents the weighting coefficient of the Y-direction load at the bottom of the tower.

[0023] Furthermore, the method further includes:

[0024] Determine the network disconnection torque reduction rate of the converter system, as well as the segmented pitch rate and segmented pitch time of the pitch system according to the load level and the emergency stop control parameters.

[0025] Further, the segmented pitch rate includes a first-stage pitch rate, a second-stage pitch rate, and a third-stage pitch rate;

[0026] The segmented pitch time includes a first-stage pitch time and a second-stage pitch time;

[0027] Judging the fault level of the wind turbine according to the fault information includes:

[0028] When the fault information is a grid fault, a converter fault, a generator short circuit, or a blade jamming, judging that the fault level of the wind turbine is the first level;

[0029] When the fault information is a tower bottom emergency stop button trigger, a tower top emergency stop button trigger, a soft overspeed of the rotational speed, or an encoder fault, judging that the fault level of the wind turbine is the second level.

[0030] In a third aspect, the present application provides a wind turbine emergency shutdown and load reduction control device, and the device includes:

[0031] A receiving module, configured to receive an emergency shutdown signal instruction;

[0032] An obtaining module, configured to obtain the fault information of the wind turbine;

[0033] A judging module, configured to judge the fault level of the wind turbine according to the fault information, and the fault level includes a first level and a second level;

[0034] A control module, configured to directly disconnect the grid of the converter system and control the pitch system to retract the blades at a preset constant pitch rate when the fault level is the first level;

[0035] A determining module, configured to determine the load level of the wind turbine when the fault level is the second level, determine the grid disconnection torque reduction rate of the converter system according to the load level, and the segmented pitch rate and segmented pitch time of the pitch system;

[0036] The control module is further configured to flexibly disconnect the grid of the converter system according to the grid disconnection torque reduction rate, and control the pitch system to retract the blades at a variable pitch rate according to the segmented pitch rate and segmented pitch time.

[0037] Further, determining the load level of the wind turbine includes:

[0038] Obtaining the operation data of the wind turbine;

[0039] Determining the load of the operating components of the wind turbine according to the operation data;

[0040] Determine the load level of the wind turbine according to the weighted sum of the loads of the operating components.

[0041] In a third aspect, the present application provides an electronic device, including one or more processors;

[0042] a storage device for storing one or more programs;

[0043] When the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the wind turbine emergency shutdown and load reduction control method described in the embodiments.

[0044] In a fourth aspect, the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the wind turbine emergency shutdown and load reduction control method described in the embodiments is implemented.

[0045] Through the above technical solutions, the present application has at least the following technical effects:

[0046] In the present invention, the control system receives an emergency shutdown signal instruction, then determines the fault level of the fault signal. When the fault level is the second level, it is also necessary to determine the load level of the wind turbine, and then determine the disconnection torque reduction rate of the converter system according to the load level, as well as determine the segmented pitch rate and segmented pitch time of the pitch system. Finally, control the converter system to flexibly disconnect from the grid according to the disconnection torque reduction rate, and control the pitch system to retract the pitch at a variable rate according to the segmented pitch rate and segmented pitch time. Since the converter system is flexibly disconnected from the grid instead of directly disconnecting from the grid, and the pitch system retracts the pitch at a variable rate instead of at the maximum speed, the load impact on the blade root and the bottom of the tower caused by the sudden change of aerodynamic force during the emergency shutdown process can be greatly reduced, thereby improving the safety and service life of the wind turbine.

[0047] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The drawings are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the specification, and are used to explain the embodiments of the present invention together with the following specific implementation, but do not constitute a limitation to the embodiments of the present invention. In the drawings:

[0049] Figure 1 is a flowchart of a wind turbine emergency shutdown and load reduction control method provided by the present invention;

[0050] Figure 2 is a flowchart of determining the load level of the wind turbine in the method provided by the present invention;

[0051] Figure 3Schematic diagram of the flexible grid - disconnection strategy of the converter system in the method provided by the present invention at different times;

[0052] Figure 4 Schematic diagram of the pitch - control method for each section of variable speed rate in the pitch system in the method provided by the present invention;

[0053] Figure 5 Frame diagram of an emergency shutdown and load - reduction control device for a wind turbine provided by the present invention;

[0054] Figure 6 Frame diagram of the electronic device in the method provided by the present invention. Detailed implementation manners

[0055] According to different fault levels, the current control strategies of wind turbines are divided into normal shutdown, fast shutdown, emergency shutdown, etc. However, the control strategy for emergency shutdown is usually that the converter directly disconnects from the grid and the blades retract at the maximum speed, which causes the blades and the tower barrel to bear greater loads, thus more seriously affecting the safety and service life of the wind turbine.

[0056] In order to solve the above - mentioned technical problems, the following will describe in detail the specific implementation manners of the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only used to illustrate and explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention.

[0057] Figure 1 Flowchart of an emergency shutdown and load - reduction control method for a wind turbine provided by the present invention. As Figure 1 shown, this embodiment provides an emergency shutdown and load - reduction control method for a wind turbine, and the method includes:

[0058] S101: In response to an emergency shutdown signal instruction, obtain the fault information of the wind turbine.

[0059] The emergency shutdown signal instruction can be sent by relevant personnel or automatically sent by other conventional devices. The control system can obtain the fault information of the wind turbine through conventional means. Among them, the fault information can be grid fault, converter fault, generator short - circuit, blade jamming, triggering of the emergency stop button at the tower bottom, triggering of the emergency stop button at the tower top, soft overspeed of the rotation speed, encoder fault, etc.

[0060] S102: Judge the fault level of the wind turbine according to the fault information. The fault level includes the first level and the second level.

[0061] After the control system receives the emergency shutdown instruction, it simultaneously reads the current fault information and classifies the fault information into different levels, namely the first level and the second level, and adopts different shutdown strategies for different fault information levels; among them, in the case of grid faults, converter faults, generator short circuits, blade jams, etc. in the fault information, it is judged that the fault level of the wind turbine is the first level; in the case of the bottom tower emergency stop button being triggered, the top tower emergency stop button being triggered, soft overspeed of the rotational speed or encoder faults, etc. in the fault information, it is judged that the fault level of the wind turbine is the second level.

[0062] S103: When the fault level is the first level, control the converter system to directly disconnect from the grid, and control the pitch system to retract the blades at a preset constant pitch rate.

[0063] If the fault level is the first level, the control system controls the converter system to immediately and directly disconnect from the grid, and controls the pitch system to retract the blades at the maximum pitch rate to 90°.

[0064] S104: When the fault level is the second level, determine the load level of the wind turbine, determine the grid disconnection torque decline rate of the converter system according to the load level, as well as the segmented pitch rate and segmented pitch time of the pitch system, and control the converter system to disconnect from the grid flexibly according to the grid disconnection torque decline rate, and control the pitch system to retract the blades at a variable rate according to the segmented pitch rate and segmented pitch time.

[0065] That is, both the pitch rate and pitch time of the pitch system are divided into multiple segments, and the pitch rates of each segment are different, and there are corresponding pitch times for the segmented pitch rates.

[0066] "Flexible grid disconnection" here can be understood as slow grid disconnection, not immediate grid disconnection, and "retracting the blades at a variable rate" can be understood as retracting the blades at different rates, rather than retracting the blades at the maximum pitch rate.

[0067] The load optimization of the wind turbine needs to start from multiple aspects, such as the design optimization of component structures, mechanical property optimization, advanced control strategies, etc. This method receives the emergency shutdown signal instruction through the control system, and then judges the fault level of the fault signal. When the fault level is the second level, it is also necessary to determine the load level of the wind turbine, and then determine the grid disconnection torque decline rate of the converter system according to the load level, as well as determine the segmented pitch rate and segmented pitch time of the pitch system. Finally, control the converter system to disconnect from the grid flexibly according to the grid disconnection torque decline rate, and control the pitch system to retract the blades at a variable rate according to the segmented pitch rate and segmented pitch time. Since the converter system is disconnected from the grid flexibly instead of directly, and since the pitch system retracts the blades at a variable rate instead of at the maximum speed, it is possible to greatly reduce the load impact on the blade root and the bottom of the tower caused by the sudden change of aerodynamic force during the emergency shutdown process, thereby improving the safety and service life of the wind turbine.

[0068] Figure 2 The flowchart for determining the load level of a wind turbine in the method provided by the present invention. In some embodiments, as Figure 2 shown, determining the load level of the wind turbine specifically includes the following steps:

[0069] S201: Determine the operating data of the wind turbine.

[0070] Among them, the operating data includes wind speed, rotational speed, pitch angle, fore-aft acceleration of the nacelle, and left-right acceleration of the nacelle.

[0071] S202: Determine the loads on the operating components of the wind turbine according to the operating data.

[0072] Among them, the loads on the operating components include the X-direction load at the blade root, the Z-direction load at the blade root, the X-direction load at the bottom of the tower, and the Y-direction load at the bottom of the tower.

[0073] S203: Determine the load level of the wind turbine according to the weighted sum of the loads on the operating components.

[0074] Specifically, the load level is calculated by the following formula:

[0075] Mx_blade = G1(V, w, β, a_fa, a_ss)

[0076] Mz_blade = G2(V, w, β, a_fa, a_ss)

[0077] Mx_tower = G3(V, w, β, a_fa, a_ss)

[0078] My_tower = G4(V, w, β, a_fa, a_ss)

[0079] M_total = K1 * Mx_blade + K2 * Mz_blade + K3 * Mx_tower + K4 * My_tower;

[0080] Wherein, V represents the wind speed, w represents the rotational speed, β represents the pitch angle, a_fa represents the acceleration of the nacelle in the front-rear direction, a_ss represents the acceleration of the nacelle in the left-right direction, Mx_blade represents the load in the X direction at the blade root, Mz_blade represents the load in the Z direction at the blade root, Mx_tower represents the load in the X direction at the bottom of the tower, My_tower represents the load in the Y direction at the bottom of the tower, M_total represents the load level, G() represents an empirical function, K1 represents the weighting coefficient of the load in the X direction at the blade root, K2 represents the weighting coefficient of the load in the Z direction at the blade root, K3 represents the weighting coefficient of the load in the X direction at the bottom of the tower, K4 represents the weighting coefficient of the load in the Y direction at the bottom of the tower, and the weighting system is determined according to actual working experience and the actual situation of the unit.

[0081] Figure 3 It is a schematic diagram of the flexible disconnection strategy of the converter system at different times in the method provided by the present invention. Figure 4 It is a schematic diagram of the pitch control method with a segmented variable speed rate of the pitch system in the method provided by the present invention; Figure 3 In it, the abscissa represents time, with the unit of s, and the ordinate represents the generator torque, with the unit of kNm. Figure 4 In it, the abscissa represents time, with the unit of s, and the ordinate represents the blade pitch rate, with the unit of deg / s.

[0082] As Figure 3 shown, in some embodiments, the disconnection torque reduction rate of the converter system, as well as the segmented pitch rate and segmented pitch time of the pitch system, are determined according to the load level and the emergency stop control parameters. Here, the emergency stop control parameters can record the standard emergency stop control parameters based on past work experiences and can be made into a table. When the wind turbine is emergently shut down later, the previously recorded emergency stop control parameters can be directly queried, and the corresponding flexible disconnection strategy, segmented pitch rate, and segmented pitch time can be selected more quickly and accurately according to these emergency stop control parameters. According to Figure 3 it can be seen that each line of the flexible disconnection strategy has a certain slope, which represents the speed of the disconnection torque reduction rate. The larger the slope, the greater the disconnection torque reduction rate and the shorter the time used. The smaller the slope, the smaller the disconnection torque reduction rate and the longer the time used. Since the converter system is flexibly disconnected instead of directly disconnected, the load impact on the blade root and the bottom of the tower caused by the sudden change of aerodynamic force during the emergency shutdown process can be greatly reduced, thereby improving the safety and service life of the wind turbine.

[0083] As Figure 4 shown, here the pitch rate of the pitch system is divided into three segments, called "three-segment variable speed rate". The segmented pitch rate includes the first-segment pitch rate, the second-segment pitch rate, and the third-segment pitch rate. The segmented pitch time includes the first-segment pitch time and the second-segment pitch time. FromFigure 4 It can be seen that starting from 10s on the abscissa, a three-stage variable speed rate is implemented for the pitch rate of the pitch system to retract the blades. Since the pitch system retracts the blades at a variable speed rate rather than at the maximum speed, the load impact on the blade root and the bottom of the tower caused by the sudden change of aerodynamic force during the emergency shutdown process can be greatly reduced, thereby improving the safety and service life of the wind turbine.

[0084] Figure 5 The framework diagram of a wind turbine emergency shutdown and load reduction control device provided by the present invention is as Figure 5 shown. The present application provides a wind turbine emergency shutdown and load reduction control device, and the device includes:

[0085] A receiving module, configured to receive an emergency shutdown signal instruction, where the emergency shutdown signal instruction can be sent by relevant personnel or automatically sent by other devices.

[0086] An obtaining module, configured to obtain the fault information of the wind turbine. The control system can obtain the fault information of the wind turbine through conventional means, where the fault information can be grid fault, converter fault, generator short circuit, blade jamming, tower bottom emergency stop button trigger, tower top emergency stop button trigger, soft overspeed of rotation speed, encoder fault, etc.

[0087] A judging module, configured to judge the fault level of the wind turbine according to the fault information. The fault level includes a first level and a second level. After receiving the emergency shutdown instruction, the control system reads the current fault information at the same time and classifies the fault information into different levels, that is, the first level and the second level, and adopts different shutdown strategies for different fault information levels; among them, the first level includes grid fault, converter fault, generator short circuit, blade jamming, etc.; the second level includes tower bottom emergency stop button trigger, tower top emergency stop button trigger, soft overspeed of rotation speed, encoder fault, etc.

[0088] A control module, configured to control the converter system to directly disconnect from the grid and control the pitch system to retract the blades at the maximum pitch rate when the fault level is the first level. If the fault level is the first level, the control system controls the converter system to immediately directly disconnect from the grid and controls the pitch system to retract the blades at the maximum pitch rate to 90°.

[0089] A determining module, configured to determine the load level of the wind turbine when the fault level is the second level, that is, to determine the load level of the wind turbine, and determine the disconnection torque reduction rate of the converter system and the segmented pitch rate and segmented pitch time of the pitch system according to the load level, that is, the pitch rate and time of the pitch system are divided into multiple segments, and the pitch rate of each segment is different, and each segment of the pitch rate has a corresponding pitch time.

[0090] The control module is also used to control the flexible network disconnection of the converter system according to the network disconnection torque reduction rate, and control the variable speed pitch system to retract the pitch according to the segmented pitch rate and the segmented pitch time. Here, "flexible network disconnection" can be understood as slow network disconnection rather than immediate network disconnection, and "variable speed pitch retraction" can be understood as retracting the pitch at different rates instead of at the maximum pitch rate.

[0091] This device receives an emergency stop signal instruction through the control system, and then judges the fault level of the fault signal. When the fault level is the second level, it is also necessary to determine the load level of the wind turbine generator set, and then determine the network disconnection torque reduction rate of the converter system and the segmented pitch rate and the segmented pitch time of the pitch system according to the load level. Finally, control the flexible network disconnection of the converter system according to the network disconnection torque reduction rate, and control the variable speed pitch retraction of the pitch system according to the segmented pitch rate and the segmented pitch time. Since the converter system is flexibly disconnected from the network instead of directly disconnected from the network, and since the pitch system retracts the pitch at a variable speed instead of at the maximum speed, it is possible to greatly reduce the load impact on the blade root and the tower bottom caused by the sudden change of aerodynamic force during the emergency stop process, thereby improving the safety and service life of the wind turbine generator set.

[0092] In some embodiments,

[0093] Determining the load level of the wind turbine generator set includes:

[0094] Determining the operating data of the wind turbine generator set;

[0095] Determining the load of the operating components of the wind turbine generator set according to the operating data;

[0096] Determining the load level of the wind turbine generator set according to the weighted sum of the loads of the operating components.

[0097] Specifically, the load level is calculated by the following formula:

[0098] Mx_blade = G1(V, w, β, a_fa, a_ss)

[0099] Mz_blade = G2(V, w, β, a_fa, a_ss)

[0100] Mx_tower = G3(V, w, β, a_fa, a_ss)

[0101] My_tower = G4(V, w, β, a_fa, a_ss)

[0102] M_total = K1 * Mx_blade + K2 * Mz_blade + K3 * Mx_tower + K4 * My_tower.

[0103] Among them, V represents the wind speed, w represents the rotational speed, β represents the pitch angle, a_fa represents the front-back acceleration of the nacelle, a_ss represents the left-right acceleration of the nacelle, Mx_blade represents the X-direction load at the blade root, Mz_blade represents the Z-direction load at the blade root, Mx_tower represents the X-direction load at the bottom of the tower, My_tower represents the Y-direction load at the bottom of the tower, M_total represents the load level, G() represents an empirical function, K1 represents the weighting coefficient of the X-direction load at the blade root, K2 represents the weighting coefficient of the Z-direction load at the blade root, K3 represents the weighting coefficient of the X-direction load at the bottom of the tower, K4 represents the weighting coefficient of the Y-direction load at the bottom of the tower, and the weighting system is determined according to actual working experience and actual conditions.

[0104] The rest is the same as that in the part of an emergency shutdown and load reduction control method for a wind turbine generator set, and will not be elaborated here.

[0105] Figure 6 This is the framework diagram of the electronic device in the method provided by the present invention. In another alternative embodiment, the present embodiment discloses an electronic device, such as Figure 6 shown, which shows the structural schematic diagram of the electronic device involved in the embodiment of the present invention. Specifically:

[0106] The electronic device includes components such as a memory 101, one or more processors 102, a power supply 103, and an input unit 104; those skilled in the art can understand that Figure 6 the structure of the electronic device shown in does not constitute a limitation on the electronic device, and it may include more or fewer components than shown, or combine certain components, or have different component arrangements. Among them:

[0107] The processor 102 is the control center of the electronic device, connecting various parts of the entire electronic device through various interfaces and lines. By running or executing software programs and / or modules stored in the memory 101, and calling data stored in the memory 101, it executes various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. Optionally, the processor 102 may include one or more processing cores; preferably, the processor 102 may integrate an application processor and a modem processor. Among them, the application processor mainly processes the operating system, user interface, and application programs, etc., and the modem processor mainly processes wireless communication. It can be understood that the above modem processor may not be integrated into the processor 102.

[0108] The memory 101 can be used to store software programs and modules. The processor 102 executes various functional applications and data processing by running the software programs and modules stored in the memory 101. The memory 101 mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required for at least one function (such as a sound playback function, an image playback function, etc.); the data storage area can store data created according to the use of the electronic device. In addition, the memory 101 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices. Correspondingly, the memory 101 may also include a memory controller to provide the processor 102 with access to the memory 101.

[0109] The electronic device further includes a power supply 103 for powering each component. Preferably, the power supply 103 can be logically connected to the processor 102 through a power management system, so as to realize functions such as management of charging, discharging, and power consumption management through the power management system. The power supply 103 may also include any components such as one or more DC or AC power supplies, a recharge system, a power failure detection circuit, a power converter or inverter, and a power status indicator.

[0110] The electronic device may further include an input unit 104, which can be used to receive input digital or character information, and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function controls.

[0111] Although not shown, the electronic device may further include a display unit, etc., which will not be elaborated here. Specifically, in this embodiment, when one or more programs are executed by one or more processors 102 in the electronic device, the one or more processors 102 implement the emergency shutdown and load reduction control method of the wind turbine unit in the above embodiment.

[0112] Those of ordinary skill in the art can understand that all or part of the steps in the above various methods can be completed by instructions, or by controlling related hardware through instructions. The instructions can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0113] In another embodiment, a computer-readable storage medium is further provided. A computer program is stored on the computer-readable storage medium. When the computer program is executed by a processor, the emergency shutdown and load reduction control method of the wind turbine unit in the above embodiment is implemented.

[0114] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, an apparatus, or a computer program product. Therefore, the present application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) that contain computer-usable program code.

[0115] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses, and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks 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, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for realizing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0116] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing devices to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured product including an instruction device, and the instruction device realizes the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0117] These computer program instructions can also be loaded onto a computer or other programmable data processing devices, so that a series of operation steps are executed on the computer or other programmable devices to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable devices provide steps for realizing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: still can modify the specific implementation manners of the present invention or make equivalent replacements, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the protection scope of the claims of the present invention.

Claims

1. An emergency shutdown and load reduction control method for a wind turbine, characterized in that, The method includes: Obtaining the fault information of the wind turbine in response to an emergency shutdown signal instruction; Judging the fault level of the wind turbine according to the fault information, where the fault level includes a first level and a second level; When the fault level is the first level, controlling the converter system to directly disconnect from the grid, and controlling the pitch system to retract the blades at a preset constant pitch rate; When the fault level is the second level, determining the load level of the wind turbine, determining the disconnection torque reduction rate of the converter system and the segmented pitch rate and segmented pitch time of the pitch system according to the load level, controlling the converter system to flexibly disconnect from the grid according to the disconnection torque reduction rate, and controlling the pitch system to retract the blades at a variable rate according to the segmented pitch rate and segmented pitch time; where, determining the load level of the wind turbine includes: obtaining the operation data of the wind turbine; determining the load of the operating components of the wind turbine according to the operation data; determining the load level of the wind turbine according to the weighted sum of the loads of the operating components.

2. The emergency shutdown and load reduction control method for a wind turbine unit according to claim 1, characterized in that, The operation data includes wind speed, rotational speed, pitch angle, fore-aft acceleration of the nacelle, and left-right acceleration of the nacelle; The loads of the operating components include the X-direction load at the blade root, the Z-direction load at the blade root, the X-direction load at the bottom of the tower, and the Y-direction load at the bottom of the tower.

3. The emergency shutdown and load reduction control method for a wind turbine unit according to claim 2, characterized in that , determining the load level of the wind turbine further includes: Mx_blade = G1(V, w, β, a_fa, a_ss) Mz_blade = G2(V, w, β, a_fa, a_ss) Mx_tower = G3(V, w, β, a_fa, a_ss) My_tower = G4(V, w, β, a_fa, a_ss) M_total = K1 * Mx_blade + K2 * Mz_blade + K3 * Mx_tower + K4 * My_tower; Where, V represents the wind speed, w represents the rotational speed, β represents the pitch angle, a_fa represents the fore-aft acceleration of the nacelle, a_ss represents the left-right acceleration of the nacelle, Mx_blade represents the X-direction load at the blade root, Mz_blade represents the Z-direction load at the blade root, Mx_tower represents the X-direction load at the bottom of the tower, My_tower represents the Y-direction load at the bottom of the tower, M_total represents the load level, G() represents an empirical function, K1 represents the weighting coefficient of the X-direction load at the blade root, K2 represents the weighting coefficient of the Z-direction load at the blade root, K3 represents the weighting coefficient of the X-direction load at the bottom of the tower, and K4 represents the weighting coefficient of the Y-direction load at the bottom of the tower.

4. The emergency shutdown and load reduction control method for a wind turbine unit according to any one of claims 1-3, characterized in that , the method further includes: Determining the disconnection torque reduction rate of the converter system and the segmented pitch rate and segmented pitch time of the pitch system according to the load level and the emergency stop control parameters.

5. The emergency shutdown and load reduction control method for a wind turbine unit according to claim 4, characterized in that , the segmented pitch rate includes a first-segment pitch rate, a second-segment pitch rate, and a third-segment pitch rate; The segmented pitch time includes a first-segment pitch time and a second-segment pitch time; Judging the fault level of the wind turbine according to the fault information includes: In the case where the fault information is a power grid fault, a converter fault, a generator short circuit, or a blade jam, it is determined that the fault level of the wind turbine is the first level; In the case where the fault information is the triggering of the emergency stop button at the tower base, the triggering of the emergency stop button at the tower top, a soft overspeed of the rotational speed, or an encoder fault, it is determined that the fault level of the wind turbine is the second level.

6. An emergency shutdown and load reduction control device for a wind turbine unit, characterized in that, The device includes: a receiving module, configured to receive an emergency stop signal instruction; an obtaining module, configured to obtain the fault information of the wind turbine; a judging module, configured to judge the fault level of the wind turbine according to the fault information, where the fault level includes a first level and a second level; a control module, configured to, in the case where the fault level is the first level, control the converter system to directly disconnect from the grid and control the pitch system to retract the blades at a preset constant pitch rate; a determining module, configured to, in the case where the fault level is the second level, determine the load level of the wind turbine, and determine the disconnection torque reduction rate of the converter system and the segmented pitch rate and segmented pitch time of the pitch system according to the load level; wherein, determining the load level of the wind turbine includes: obtaining the operation data of the wind turbine; determining the load of the operating components of the wind turbine according to the operation data; and determining the load level of the wind turbine according to the weighted sum of the loads of the operating components; The control module is further configured to control the converter system to disconnect from the grid flexibly according to the disconnection torque reduction rate, and control the pitch system to retract the blades at a variable rate according to the segmented pitch rate and the segmented pitch time.

7. An electronic device, characterized in that, including one or more processors; a storage device, configured to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the wind turbine emergency stop and load reduction control method according to any one of claims 1 to 5.

8. A computer-readable storage medium, on which a computer program is stored, characterized in that, The computer program, when executed by the processor, implements the wind turbine emergency stop and load reduction control method according to any one of claims 1 to 5.

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