Fault protection method, device and equipment for wind generating set

Abstract

The invention provides a fault protection method, device and equipment for a wind generating set, and the method comprises the steps: controlling and executing a fault protection strategy under the condition of determining that the wind generating set has a target fault; wherein the target fault comprises a blade paddle clamping fault and / or an impeller overspeed fault, and the fault protection strategy comprises the following steps of simultaneously executing the following operations: controlling the rotating speed of the wind generating set to be gradually reduced through torque until the rotating speed is reduced to a target rotating speed value; a variable pitch system of the wind generating set is controlled to execute a pitch retracting operation until a blade pitch angle is a target angle; and a yaw system of the wind generating set is controlled to execute yaw operation until the wind deviation angle between the axis of a wind wheel and the wind direction is the target wind deviation angle. By the adoption of the technical scheme, the loads of the impeller and the yaw system can be effectively reduced, and the cost of the whole machine is reduced while safety is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind power generation, in particular to a fault protection method, device and equipment of a wind turbine generator system. BACKGROUND

[0002] As a clean and renewable energy, the core equipment of wind turbine generator system will inevitably encounter various faults during long-term operation. Among them, the blade jamming fault and the impeller overspeed fault are common faults of the wind turbine generator system. If such faults occur, the wind turbine system will immediately trigger a fault shutdown protection mode to prevent damage to the wind turbine system or cause more serious safety accidents.

[0003] The conventional fault shutdown protection strategy mainly relies on the pitch system to collect the pitch and the torque control of the converter to reduce the speed of the wind turbine to absorb the energy. However, during the transition from fault occurrence to completion of shutdown, the load of the impeller and yaw system will be too large due to the fault shutdown protection process, which will cause the impeller and yaw system to require higher design strength or yaw system and drive requirements during design, resulting in higher overall machine cost.

[0004] Therefore, during the fault shutdown protection process, how to effectively reduce the load of the impeller and yaw system so as to reduce the overall machine cost while ensuring safety is a technical problem to be solved by those skilled in the art. SUMMARY

[0005] The present application provides a fault protection method, device and equipment of a wind turbine generator system, which can effectively reduce the load of the impeller and yaw system during the fault shutdown protection process, so as to reduce the overall machine cost while ensuring safety.

[0006] The present application provides a fault protection method of a wind turbine generator system, applied to a main control device in the wind turbine generator system, the method comprising: In a case where it is determined that a target fault occurs in the wind turbine generator system, a fault protection strategy is controlled to be executed; wherein the target fault includes a blade jamming fault and / or an impeller overspeed fault, and the fault protection strategy includes simultaneously performing the following operations: The speed of the wind turbine generator system is gradually reduced by torque control until the target speed value is reached; The pitch system of the wind turbine generator system is controlled to perform a pitch collection operation until the blade pitch angle is a target angle; The yaw system of the wind turbine generator system is controlled to perform a yaw operation until the yaw deviation angle between the wind wheel axis and the wind direction is a target yaw deviation angle.

[0007] The method for protecting the wind turbine generator system from failure comprises the following steps: determining a yaw direction based on the current wind direction; controlling the yaw system to perform yaw operation at a first preset rate based on the yaw direction; wherein the first preset rate is any value within the range of 0.3° / s to 0.8° / s.

[0008] According to the method for protecting the wind turbine generator system from failure provided by the present application, the first preset rate is 0.5° / s.

[0009] According to the method for protecting the wind turbine generator system from failure provided by the present application, the target wind alignment deviation angle is any value within the range of 10° to 30°.

[0010] According to the method for protecting the wind turbine generator system from failure provided by the present application, the target wind alignment deviation angle is any value within the range of 15° to 25°.

[0011] According to the method for protecting the wind turbine generator system from failure provided by the present application, in the case where the target failure comprises blade jamming failure, the yaw direction of the target wind alignment deviation angle is the direction in which the operating angle of attack of the blade is reduced due to the increase of the linear velocity of each cross section of the blade when the impeller rotates.

[0012] The method for protecting the wind turbine generator system from failure comprises the following steps: controlling the pitch system to perform pitch operation at a second preset rate; wherein the second preset rate is any value within the range of 1.0° / s to 2.5° / s.

[0013] According to the method for protecting the wind turbine generator system from failure provided by the present application, the second preset rate is 1.5° / s.

[0014] The method for protecting the wind turbine generator system from failure provided by the present application further comprises the following steps: monitoring the yaw angle in real time during the process of controlling the yaw system to perform yaw operation; determining the wind alignment deviation angle based on the current wind direction and the yaw angle; stopping the yaw operation and controlling the locking cabin to lock the position in the case where the wind alignment deviation angle reaches the target wind alignment deviation angle; wherein the locking cabin locking the position provides the over yaw brake to be applied.

[0015] The application further provides a fault protection device of a wind turbine generator system, which is applied to a main control device in the wind turbine generator system, and comprises a fault diagnosis module and a main control module. The main control module is configured to control the execution of a fault protection strategy when the fault diagnosis module determines that a target fault occurs in the wind turbine generator system, wherein the target fault comprises a blade jamming fault and / or a rotor overspeed fault, and the fault protection strategy comprises simultaneously performing the following operations: gradually reducing the rotating speed of the wind turbine generator system through torque control until the rotating speed is reduced to a target rotating speed value; controlling a pitch system of the wind turbine generator system to perform a pitch-in operation until a blade pitch angle is a target angle; controlling a yaw system of the wind turbine generator system to perform a yaw operation until an off-wind deviation angle between a wind wheel axis and a wind direction is a target off-wind deviation angle.

[0016] The application further provides a main control device, which comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the wind turbine generator system fault protection method according to any one of the above when executing the computer program.

[0017] The application further provides a wind turbine generator system, characterized in comprising the wind turbine generator system fault protection device or the main control device.

[0018] The application further provides a non-transitory computer readable storage medium, which stores a computer program, and the computer program is executable on a processor to implement the wind turbine generator system fault protection method according to any one of the above.

[0019] The application further provides a computer program product, which comprises a computer program, and the computer program is executable on a processor to implement the wind turbine generator system fault protection method according to any one of the above.

[0020] The wind turbine fault protection method, device and equipment provided by the application, in the case of determining that the wind turbine has a target fault, control the execution of a fault protection strategy; wherein the target fault includes a blade jamming fault and / or a rotor overspeed fault, and the fault protection strategy includes simultaneously executing the following operations: gradually reducing the speed of the wind turbine through torque control until the speed is reduced to a target speed value; controlling the pitch system of the wind turbine to execute a pitch-in operation until the blade pitch angle is a target angle; and controlling the yaw system of the wind turbine to execute a yaw operation until the angle of attack between the wind wheel axis and the wind direction is a target angle of attack. In this way, in the case of a blade jamming fault and / or a rotor overspeed fault, the fault protection strategy is controlled to be executed, including simultaneously gradually reducing the speed of the wind turbine through torque control until the speed is reduced to a target speed value, controlling the pitch system of the wind turbine to execute a pitch-in operation, and controlling the yaw system of the wind turbine to execute a yaw operation, which can make the entire wind wheel deviate from the main wind direction, reduce the wind energy captured by the wind wheel from the source, and thus effectively reduce the extreme load under the blade jamming fault and / or the rotor overspeed fault, so as to solve the problem of high overall machine cost caused by excessive load of the wind wheel and the yaw system in the shutdown protection process, and make it possible to reduce the overall machine cost while ensuring safety. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0022] Figure 1 A flowchart of a wind turbine fault protection method provided by an embodiment of the application.

[0023] Figure 2 A framework diagram of a wind turbine fault protection method provided by an embodiment of the application.

[0024] Figure 3 A structural diagram of a wind turbine fault protection device provided by an embodiment of the application.

[0025] Figure 4 An entity structure diagram of a main control device provided by an embodiment of the application. DETAILED DESCRIPTION

[0026] In order to make the purposes, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0027] In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. The association relationship of "and / or" describing the associated objects indicates that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. In the textual description of the present application, the character " / " generally represents an "or" relationship between the associated objects before and after it.

[0028] The technical solutions provided by the present application can be applied to the fault protection scene of a wind turbine generator set. Blade stall failure and impeller overspeed failure are common failures of a wind turbine generator set. If such a failure occurs, the wind turbine set will immediately trigger a failure shutdown protection mode to prevent damage to the wind turbine set or cause more serious safety accidents.

[0029] Among them, for the impeller overspeed failure, the reasons include: wind speed changes too large or too fast, control system failure, sensor failure, etc. Generally, the speed sensor monitors the impeller speed signal. When the wind turbine impeller appears overspeed, the impeller speed signal reaches the soft overspeed threshold, which is generally 1.15 times the rated speed of the impeller, the wind turbine generator set will immediately enter the software shutdown protection mode, i.e. the blade is pitch and shutdown; when the impeller speed signal reaches the hard overspeed threshold, which is generally 1.2 times the rated speed of the impeller, the wind turbine generator set immediately starts the failure shutdown protection strategy and enters the failure shutdown protection mode, i.e. the blade is pitch and shutdown. Because in the time period from the rising of the impeller speed to the start of the failure shutdown protection strategy, the speed continuously exceeds the rated speed of the impeller for a period of time, and the wind energy absorbed by the impeller continuously remains at a high level, the load of the impeller and the yaw system is too large, and the excessive load will cause the impeller and the yaw system to require higher design strength or yaw system and drive requirements during design, resulting in higher overall machine cost.

[0030] For the blade jam, in the case of a single blade jam failure, the wind turbine immediately starts the fault shutdown protection strategy and enters the fault shutdown protection mode. Since the single blade cannot be pitched, the other two blades are normally pitched, which leads to excessive load on the impeller and yaw system during the fault shutdown protection process. The excessive load requires higher design strength or yaw system and drive requirements during the design of the impeller and yaw system, resulting in higher overall machine cost.

[0031] Therefore, during the fault shutdown protection process, how to effectively reduce the load of the impeller and yaw system so that the overall machine cost can be reduced while safety is ensured, the embodiments of the present application provide a fault protection method of a wind turbine. In the following, the fault protection method of the wind turbine provided by the present application will be described in detail through the following specific embodiments. It can be understood that the following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described in some embodiments.

[0032] Figure 1 A flowchart of a fault protection method of a wind turbine provided by an embodiment of the present application is applied to a main control device in a wind turbine. For example, as shown in the figure, the fault protection method of the wind turbine can include: Figure 1 S101, in the case of determining that a target fault occurs in the wind turbine, a fault protection strategy is controlled to be executed; wherein the target fault includes a blade jam fault and / or an impeller overspeed fault, and the fault protection strategy includes simultaneously performing the following operations: The speed of the wind turbine is gradually reduced by torque control until the speed is reduced to a target speed value; The pitch system of the wind turbine is controlled to perform a pitch-in operation until the blade pitch angle is a target angle; The yaw system of the wind turbine is controlled to perform a yaw operation until the angle of the wind direction deviation between the wind wheel axis and the wind direction is a target angle of wind direction deviation.

[0033] For example, in the embodiments of the present application, the target torque value can be 20% of the rated torque value, which can be set according to actual needs.

[0034] For example, in the embodiments of the present application, the target angle can be 90°, which can be set according to actual needs.

[0035] For example, in the embodiments of the present application, the target angle of wind direction deviation can be any value in the range of 10° to 30°. Further, the target angle of wind direction deviation is any value in the range of 15° to 25°, which can be set according to actual needs.

[0036] ​For the impeller overspeed fault, for example, the soft overspeed threshold value can be 1.12-1.18 times of the rated speed of the impeller, and the hard overspeed threshold value is 1.18-1.25 times of the rated speed of the impeller, which can be set according to actual needs. If the impeller speed signal exceeds the soft overspeed threshold value, the software fault protection strategy, i.e. the fault protection strategy in the application, is triggered.

[0037] For example, in the embodiment of the application, the main control device can determine whether the wind turbine generator set has a blade jamming fault and / or an impeller overspeed fault through the fault diagnosis module thereof. Specifically, for the blade jamming fault, the fault diagnosis module can continuously monitor the pitch feedback in the wind turbine generator set; if it is found that the pitch angle of a certain blade has no change or an abnormal change rate after the command is issued, and the change lasts for more than a set time, for example, 2 seconds, it can be determined that the wind turbine generator set has a blade jamming fault.

[0038] For the impeller overspeed fault, the fault diagnosis module can obtain the impeller speed signal collected by the speed sensor in real time, the sampling frequency is not less than 10 Hz, and compare the impeller speed signal with the corresponding soft overspeed threshold value. If the impeller speed signal exceeds the corresponding soft overspeed threshold value, it can be determined that the wind turbine generator set has an impeller overspeed fault.

[0039] In the case of determining whether the wind turbine generator set has a blade jamming fault and / or an impeller overspeed fault, the main controller in the main control device, for example, the main programmable logic controller (PLC) dedicated control unit, can control the execution of the fault protection strategy, so that the entire impeller deviates from the main wind direction, reduces the energy input from the source, and reduces the wind energy captured by the wind wheel, thereby effectively reducing the limit load under the blade jamming fault and / or the impeller overspeed fault, to solve the problem of high cost of the entire machine caused by the excessive load of the impeller and yaw system in the obstacle shutdown protection process, so that the safety can be ensured while reducing the cost of the entire machine.

[0040] For example, in the embodiment of the application, the main control module in the main control device, for example, the main controller, controls the execution of the fault protection strategy, including simultaneously controlling the speed of the wind turbine generator set to gradually decrease until the target speed value through torque control, controlling the pitch system of the wind turbine generator set to perform the pitch operation, and controlling the yaw system of the wind turbine generator set to perform the yaw operation.

[0041] For example, the main controller gradually reduces the rotating speed of the wind turbine generator set through torque control until the rotating speed is reduced to the target rotating speed value. Specifically, the main controller can give a torque given value, and the converter accurately controls the torque value of the generator to gradually reduce the rotating speed of the wind turbine generator set through torque control until the rotating speed is reduced to the target rotating speed value by adjusting the switching of power electronic devices such as insulated gate bipolar transistors (IGBT).

[0042] For example, when the main controller controls the pitch system of the wind turbine generator set to perform the pitch-in operation, the main controller can control the pitch drive motor or the pitch hydraulic system to perform the pitch-in operation. For example, when the main controller controls the pitch drive motor to perform the pitch-in operation, each blade is driven by an independent servo motor, and the blade is rotated through a gear box. The main controller sends a pitch-in instruction to the pitch drive motor, and the pitch drive motor performs the pitch-in operation to 90° to the pitch position after receiving the pitch-in instruction. For example, when the main controller controls the pitch hydraulic system to perform the pitch-in operation, the main controller sends a pitch-in instruction to the pitch hydraulic system, and the pitch hydraulic system performs the pitch-in operation to 90° to the pitch position by driving the hydraulic cylinder or the hydraulic motor to push the blade after receiving the pitch-in instruction. In this way, the reverse drag can be assisted to brake.

[0043] For example, when the main controller controls the yaw system of the wind turbine generator set to perform the yaw operation, the yaw brake can be first controlled to be released to release the locking state of the nacelle. Then, the yaw motor is started to drive the nacelle to rotate to perform the yaw operation by using the torque of the yaw motor. In this way, the entire impeller can be deviated from the main wind direction through active yaw control, the energy input from the source can be reduced, and the wind energy captured by the wind wheel can be significantly reduced. Therefore, the limit load of the blade pitch-in failure and / or the impeller overspeed failure can be effectively reduced. According to simulation calculation verification, the limit load of the torque around the Y axis at the hub center can be reduced by about 3%, and the limit load of the torque around the Z axis of the yaw system can be reduced by about 10%. This makes the above-mentioned failure working condition no longer the dominant working condition of the component load and cost, and provides space for lightweight and cost reduction. In addition, the structural damage or chain failure caused by the blade pitch-in failure and / or the impeller overspeed failure can be effectively avoided, and the survival ability and operation safety of the unit in severe working conditions are improved.

[0044] It should be noted that in the embodiments of the present application, the control of the failure protection strategy is a software optimization scheme, and no new hardware device needs to be additionally added. The control logic is only optimized to achieve the control, and the implementation cost is extremely low, but the cost reduction benefit is very significant.

[0045] It can be seen that, in the embodiment of the application, in the case where it is determined that the wind turbine generator set has a target fault, a fault protection strategy is executed; wherein the target fault includes a blade jamming fault and / or a rotor overspeed fault, and the fault protection strategy includes simultaneously performing the following operations: gradually reducing the rotational speed of the wind turbine generator set through torque control until the rotational speed is reduced to a target rotational speed value; controlling the pitch system of the wind turbine generator set to perform a pitch-in operation until the blade pitch angle is a target angle; and controlling the yaw system of the wind turbine generator set to perform a yaw operation until the yaw deviation angle between the wind wheel axis and the wind direction is a target yaw deviation angle. In this way, in the case of a blade jamming fault and / or a rotor overspeed fault, the fault protection strategy is executed, including simultaneously gradually reducing the rotational speed of the wind turbine generator set through torque control until the rotational speed is reduced to a target rotational speed value, controlling the pitch system of the wind turbine generator set to perform a pitch-in operation, and controlling the yaw system of the wind turbine generator set to perform a yaw operation, which can make the entire rotor deviate from the main wind direction, reduce the wind energy captured by the rotor from the source, and thus effectively reduce the extreme load under the blade jamming fault and / or the rotor overspeed fault, so as to solve the problem of high overall machine cost caused by excessive load of the rotor and the yaw system in the shutdown protection process, and make it possible to reduce the overall machine cost while ensuring safety.

[0046] For example, in the embodiment of the application, the above-mentioned main controller controls the pitch system of the wind turbine generator set to perform a pitch-in operation, including: controlling the pitch system to perform the pitch-in operation at a second preset rate; wherein the second preset rate is any value in the range of 1.0° / s to 2.5° / s.

[0047] For example, in the embodiment of the application, the second preset rate is 1.5° / s, which can be set according to actual needs.

[0048] For example, in the embodiment of the application, when the above-mentioned main controller controls the yaw system of the wind turbine generator set to perform a yaw operation, the yaw direction can be determined based on the current wind direction first; and the yaw system is controlled to perform the yaw operation at a first preset rate based on the yaw direction.

[0049] wherein the first preset rate is any value in the range of 0.3° / s to 0.8° / s.

[0050] For example, in the embodiment of the application, the first preset rate is 0.5° / s, which can be set according to actual needs.

[0051] For example, when the main controller determines the yaw direction based on the current wind direction, on one hand, the current wind direction angle from the nacelle top wind direction indicator can be determined based on the wind speed and direction indicator, with 0° being due north and increasing clockwise; on the other hand, the current nacelle position angle from the yaw encoder can be obtained, representing the yaw angle of the current orientation of the nacelle, also with 0° being due north; and a preliminary deviation is calculated based on the wind deviation angle = current wind direction angle - current nacelle position angle; and the preliminary deviation is normalized to convert the calculation result to [-180°, +180°]. For example, if the preliminary calculation result is +190°, it should be normalized to -170° after normalization, which represents a 170° counterclockwise yaw in the shorter path; the sign of the normalized wind deviation angle directly determines the optimal yaw direction: if the deviation angle is positive, for example, +30°, it indicates that the wind direction is in the clockwise direction of the nacelle orientation, and the controller determines the clockwise direction as the yaw direction; if the deviation angle is negative, for example, -45°, it indicates that the wind direction is in the counterclockwise direction of the nacelle orientation. At this time, the controller determines the counterclockwise direction as the yaw direction.

[0052] After the yaw direction is determined, the yaw direction and the first preset speed can be combined to generate a specific control instruction, which is sent to the yaw driver to start the yaw motor to rotate in the most efficient path towards the target direction. Through active yaw control, the entire impeller can be deviated from the main wind direction, reducing energy input from the source, significantly reducing the wind energy captured by the wind wheel, and thus effectively reducing the limit load under the blade stall failure and / or impeller overspeed failure.

[0053] For example, in the embodiments of the present application, in the case where the target failure includes a blade stall failure, the yaw direction of the target wind deviation angle is in the direction in which the increase in the linear velocity of each cross section of the blade during the rotation of the impeller causes the operating angle of attack of each cross section of the blade to decrease, so that the most dangerous unbalanced load can be actively and accurately reduced, thereby protecting the yaw system, the transmission chain and the foundation structure, and preventing the failure from worsening into a catastrophic accident.

[0054] For example, in the embodiments of the present application, the main controller can also monitor the yaw angle in real time during the control of the yaw system to perform the yaw operation; determine the wind deviation angle based on the current wind direction and the yaw angle; and stop performing the yaw operation and control the locking of the nacelle position when the wind deviation angle reaches the target wind deviation angle, wherein the locking of the nacelle position is provided by the locking of the over-yaw brake.

[0055] For example, the main controller can convert the real-time signals of the yaw encoder installed on the yaw system into the yaw angle value of the nacelle relative to the tower, thereby achieving continuous and real-time angle monitoring.

[0056] For example, when the main controller determines the wind deviation angle based on the current wind direction and the yaw angle, on the one hand, the current wind direction angle from the nacelle top wind direction indicator can be determined based on the wind speed and direction indicator, with north as 0° and increasing clockwise; on the other hand, the current nacelle position angle from the yaw encoder is obtained, representing the yaw angle of the current orientation of the nacelle, also with north as 0°; and the preliminary deviation is calculated based on the wind deviation angle = current wind direction angle - yaw angle; and the preliminary deviation is normalized to convert the calculation result to [-180°, +180°]. The shortest yaw path and direction are determined, and the final accurate angle value with a positive or negative sign is denoted as the wind deviation angle.

[0057] In this way, when the wind deviation angle reaches the target wind deviation angle, the yaw operation can be stopped, and the nacelle position can be locked, so that the theoretically optimal unloading posture can be accurately converted into an actual, stable, and controllable physical state, thereby truly achieving the reduction of the extreme load and providing an ultimate engineering guarantee for reducing the overall cost.

[0058] Based on any of the above embodiments, taking the impeller overspeed fault as an example, in the embodiment of the present application, when the impeller speed drops to 30% of the rated speed or below and the blade pitch angle is 90° in the feathering state, the yaw system is unlocked, the nacelle is controlled to yaw against the wind, and after the yaw against the wind is completed, the machine is stopped and enters the standby state. After the fault is eliminated, the operator restarts the unit by pressing the reset button of the control system.

[0059] For example, during the entire shutdown process, the impeller speed, blade pitch angle, yaw angle, and other key parameters can be continuously monitored. If any abnormal condition is detected, a backup protection strategy, i.e., a hardware fault protection strategy, is immediately started, and an independent safety chain system is activated. In this way, the contradiction between intelligent load reduction and absolute safety can be fundamentally solved, thereby providing an effective guarantee for reducing the overall cost.

[0060] In combination with the above description, for example, refer to Figure 2 as shown, Figure 2 A framework schematic diagram of a fault protection method of a wind turbine provided by the embodiment of the present application is shown. When the wind turbine is normally operating, the main control device determines whether a target fault occurs in the wind turbine; wherein the target fault includes a blade jamming fault and / or an impeller overspeed fault; and in the case where it is determined that the target fault occurs in the wind turbine, a fault protection strategy is controlled to be executed.

[0061] The fault protection strategy comprises simultaneously performing the following operations: gradually reducing the rotating speed of the wind turbine generator set by torque control until the rotating speed is reduced to a target rotating speed value; controlling the variable pitch system of the wind turbine generator set to perform a pitch-in operation until the blade pitch angle is a target angle; and controlling the yaw system of the wind turbine generator set to perform a yaw operation until the angle of wind alignment deviation between the wind wheel axis and the wind direction is a target angle of wind alignment deviation. In this way, the entire wind wheel can be deviated from the main wind direction, the energy input can be reduced from the source, and the wind energy captured by the wind wheel can be reduced, so that the limit load under the blade pitch fault and / or the wind wheel overspeed fault can be effectively reduced, the problem of high overall cost caused by the excessive load of the wind wheel and the yaw system in the shutdown protection process can be solved, and the overall cost can be reduced while safety is ensured.

[0062] Further, when the rotating speed of the wind wheel is reduced to below 30% of the rated rotating speed and the blade pitch angle is in a 90° feathering state, the nacelle is controlled to yaw to wind, and after the yaw to wind is completed, shutdown is completed and a standby state is entered, the yaw system remains at the current yaw position until the fault is eliminated, and an operator restarts the wind turbine generator set by resetting the control system.

[0063] The wind turbine generator set fault protection device provided in the present application is described below, and the wind turbine generator set fault protection device described below can be correspondingly referred to the wind turbine generator set fault protection method described above.

[0064] Figure 3 A structural schematic diagram of a wind turbine generator set fault protection device provided in an embodiment of the present application is applied to a main control device in a wind turbine generator set. The wind turbine generator set fault protection device can be realized by software, hardware or a combination of both, and can be specifically set according to actual needs. For example, please refer to FIG. 1. Figure 3 As shown in the figure, the wind turbine generator set fault protection device 30 comprises a fault diagnosis module 301 and a main control module 302. The main control module 302 is configured to control the execution of a fault protection strategy in the case that the fault diagnosis module 301 determines that the wind turbine generator set has a target fault. The target fault comprises a blade pitch fault and / or a wind wheel overspeed fault, and the fault protection strategy comprises simultaneously performing the following operations: gradually reducing the rotating speed of the wind turbine generator set by torque control until the rotating speed is reduced to a target rotating speed value; controlling the variable pitch system of the wind turbine generator set to perform a pitch-in operation until the blade pitch angle is a target angle; controlling the yaw system of the wind turbine generator set to perform a yaw operation until the angle of wind alignment deviation between the wind wheel axis and the wind direction is a target angle of wind alignment deviation.

[0065] For example, in the embodiment of the present application, the main control module 302 is configured to control the yaw system of the wind turbine generator to perform yaw operation, including: determining a yaw direction based on the current wind direction; controlling the yaw system to perform yaw operation at a first preset rate based on the yaw direction; wherein the first preset rate is any value in the range of 0.3° / s to 0.8° / s.

[0066] For example, in the embodiment of the present application, the first preset rate is 0.5° / s.

[0067] For example, in the embodiment of the present application, the target wind alignment deviation angle is any value in the range of 10° to 30°.

[0068] For example, in the embodiment of the present application, the target wind alignment deviation angle is any value in the range of 15° to 25°.

[0069] For example, in the embodiment of the present application, in the case where the target fault includes a blade pitch fault, the yaw direction of the target wind alignment deviation angle is the direction in which the increase in the linear velocity of each section of the blade when the impeller rotates causes the operating angle of attack of each section of the blade to decrease.

[0070] For example, in the embodiment of the present application, the main control module 302 is configured to control the pitch system of the wind turbine generator to perform pitch operation, including: controlling the pitch system to perform pitch operation at a second preset rate; wherein the second preset rate is any value in the range of 1.0° / s to 2.5° / s.

[0071] For example, in the embodiment of the present application, the second preset rate is 1.5° / s.

[0072] For example, in the embodiment of the present application, the fault protection device 30 of the wind turbine generator further includes: a monitoring module configured to monitor the yaw angle in real time during the control of the yaw system to perform yaw operation; The main control module 302 is further configured to determine the wind alignment deviation angle based on the current wind direction and the yaw angle, and stop performing yaw operation and control the locking cabin position when the wind alignment deviation angle reaches the target wind alignment deviation angle; wherein the locking cabin locking position provides over-yaw brake closing.

[0073] The fault protection device 30 for wind turbine generator sets provided in this application embodiment can execute the technical solution of the fault protection method for wind turbine generator sets in any of the above embodiments. Its implementation principle and beneficial effects are similar to those of the fault protection method for wind turbine generator sets. Please refer to the implementation principle and beneficial effects of the fault protection method for wind turbine generator sets, which will not be repeated here.

[0074] Figure 4 This is a schematic diagram of the physical structure of a main control device provided in an embodiment of this application, such as... Figure 4 As shown, the main control device may include: a processor 410, a communication interface 420, a memory 430, and a communication bus 440. The processor 410, communication interface 420, and memory 430 communicate with each other via the communication bus 440. The processor 410 can call logical instructions in the memory 430 to execute a fault protection method for the wind turbine generator set. This method includes: upon determining that a target fault has occurred in the wind turbine generator set, controlling the execution of a fault protection strategy; wherein the target fault includes blade jamming and / or rotor overspeed fault, and the fault protection strategy includes simultaneously performing the following operations: gradually reducing the speed of the wind turbine generator set through torque control until it reaches the target speed value; controlling the pitch system of the wind turbine generator set to perform a pitch reduction operation until the blade pitch angle is the target angle; and controlling the yaw system of the wind turbine generator set to perform a yaw operation until the windward deviation angle between the rotor axis and the wind direction is the target windward deviation angle.

[0075] Furthermore, the logical instructions in the aforementioned memory 430 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0076] This application also provides a wind turbine generator set, including the one described above. Figure 3 The fault protection device of the wind turbine generator set shown, or the aboveFigure 4 The main control device shown, the implementation principle and the beneficial effects are similar to the implementation principle and the beneficial effects of the fault protection method of the wind turbine, and the implementation principle and the beneficial effects of the fault protection method of the wind turbine can be referred to, and details are not repeated here.

[0077] In another aspect, the present application also provides a computer program product, which comprises a computer program, the computer program can be stored on a non-transitory computer readable storage medium, and the computer program can be executed by a processor to execute the wind turbine fault protection method provided by the above-mentioned methods, the method comprises: in the case of determining that the wind turbine has a target fault, controlling to execute a fault protection strategy; wherein the target fault comprises a blade stall fault and / or a rotor overspeed fault, and the fault protection strategy comprises simultaneously executing the following operations: gradually reducing the rotational speed of the wind turbine through torque control until the rotational speed is reduced to a target rotational speed value; controlling the pitch system of the wind turbine to execute a pitch-in operation until the blade pitch angle is a target angle; controlling the yaw system of the wind turbine to execute a yaw operation until the yaw deviation angle between the wind wheel axis and the wind direction is a target yaw deviation angle.

[0078] In another aspect, the present application also provides a non-transitory computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the wind turbine fault protection method provided by the above-mentioned methods, the method comprises: in the case of determining that the wind turbine has a target fault, controlling to execute a fault protection strategy; wherein the target fault comprises a blade stall fault and / or a rotor overspeed fault, and the fault protection strategy comprises simultaneously executing the following operations: gradually reducing the rotational speed of the wind turbine through torque control until the rotational speed is reduced to a target rotational speed value; controlling the pitch system of the wind turbine to execute a pitch-in operation until the blade pitch angle is a target angle; controlling the yaw system of the wind turbine to execute a yaw operation until the yaw deviation angle between the wind wheel axis and the wind direction is a target yaw deviation angle.

[0079] The device embodiments described above are only schematic, wherein the units shown as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., they can be located in one place, or distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiment scheme. Those skilled in the art can understand and implement without creative labor.

[0080] Those skilled in the art can clearly understand the implementation of the various embodiments by means of software and the necessary general hardware platform from the above description of the embodiments, and of course, the embodiments can also be implemented by hardware. Based on such understanding, the above technical solutions, essentially or in other words, the part of the prior art that contributes to the technical solutions can be embodied in the form of a software product. The computer software product can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, and the like, and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0081] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A fault protection method for a wind turbine generator set, characterized in that, A main control device applied in a wind turbine generator set, the method comprising: Upon determining that a target fault has occurred in the wind turbine generator set, a fault protection strategy is executed; wherein the target fault includes blade jamming and / or rotor overspeed fault, and the fault protection strategy includes simultaneously performing the following operations: The speed of the wind turbine generator is gradually reduced by torque control until it reaches the target speed value. Control the pitch system of the wind turbine generator to perform a pitch retraction operation until the blade pitch angle is the target angle; The yaw system of the wind turbine generator is controlled to perform yaw operation until the windward deviation angle between the wind turbine axis and the wind direction is the target windward deviation angle.

2. The method according to claim 1, characterized in that, The yaw system controlling the wind turbine generator to perform yaw operations includes: Determine the yaw direction based on the current wind direction; Based on the yaw direction, control the yaw system to perform a yaw operation at a first preset rate; Wherein, the first preset rate is any value in the range of 0.3° / s to 0.8° / s.

3. The method according to claim 2, characterized in that, The first preset rate is 0.5° / s.

4. The method according to any one of claims 1-3, characterized in that, The target wind deviation angle is any value within the range of 10° to 30°.

5. The method according to any one of claims 1-3, characterized in that, The yaw direction of the target's wind deviation angle is the direction in which the angle of attack of each section of the blade decreases due to the increase in the linear velocity of each section of the blade when the impeller rotates.

6. The method according to any one of claims 1-3, characterized in that, The control system for the pitch control unit of the wind turbine generator to perform pitch retraction operation includes: The pitch control system is controlled to perform a pitch recovery operation at a second preset rate; The second preset rate is any value within the range of 1.0° / s to 2.5° / s.

7. The method according to any one of claims 1-3, characterized in that, The method further includes: During the process of controlling the yaw system to perform yaw operations, the yaw angle is monitored in real time; The wind deviation angle is determined based on the current wind direction and the yaw angle. When the wind deviation angle reaches the target wind deviation angle, the yaw operation is stopped and the nacelle position is locked; wherein, the locking of the nacelle position is achieved by engaging the yaw brake.

8. A fault protection device for a wind turbine generator set, characterized in that, A main control device used in wind turbine generator sets, the device comprising a fault diagnosis module and a main control module: The main control module is used to control the execution of a fault protection strategy when the fault diagnosis module determines that a target fault has occurred in the wind turbine generator set; wherein the target fault includes blade jamming fault and / or rotor overspeed fault, and the fault protection strategy includes simultaneously performing the following operations: The speed of the wind turbine generator is gradually reduced by torque control until it reaches the target speed value. Control the pitch system of the wind turbine generator to perform a pitch retraction operation until the blade pitch angle is the target angle; The yaw system of the wind turbine generator is controlled to perform yaw operation until the windward deviation angle between the wind turbine axis and the wind direction is the target windward deviation angle.

9. A main control device, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the fault protection method for the wind turbine generator set as described in any one of claims 1 to 7.

10. A wind turbine generator set, characterized in that, It includes the fault protection device for wind turbine generator sets as described in claim 8, or the main control equipment as described in claim 9.

Images