Wind turbine generator safety detection method

Abstract

The invention particularly relates to a wind turbine generator safety detection method, which comprises the following steps: after a main control software program in a wind turbine generator obtains a self-checking signal, starting self-checking of the wind turbine generator; whether the wind turbine generator meets the safety condition or not is judged, and when the wind turbine generator meets the safety condition, self-inspection is conducted on the paddle; if the safety condition is not met, judging that self-inspection fails; in response to the fact that the wind turbine generator meets the safety condition, the paddle is controlled to be adjusted to the self-inspection position at the preset speed; carrying out emergency feathering test on the blades one by one, wherein the emergency feathering test of each blade comprises the step of judging whether the type of a response signal, the current of a variable-pitch motor and an emergency feathering parameter reach the standard or not; whether all the three blades reach the standard or not is judged, when all the three blades reach the standard, the self-inspection test is successful, and the wind turbine generator set is started; otherwise, triggering the corresponding fault code of the wind turbine generator, and setting the three blades of the wind turbine generator to perform self-inspection successively, so as to achieve the effects of ensuring feathering safety and avoiding galloping accidents when the three blades are driven out at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine generator sets, and in particular to a wind turbine generator set safety detection method. Background Art

[0002] A wind turbine is a device that converts wind energy into electrical energy. It is mainly composed of a tower, blades, hub, generator, gearbox, control system, etc. When the wind blows the blades to rotate, it drives the generator to rotate and realize energy conversion.

[0003] At present, with the large-scale development of wind power, safety accidents of wind turbines are also increasing rapidly. There have been many safety accidents in China due to failure of the variable pitch system to shut down in time, resulting in runaway. Therefore, emergency pitch retraction tests are performed on wind turbines to achieve the purpose of regular inspection. Emergency pitch retraction tests in China are mainly divided into two options: manual operation test and automatic test.

[0004] However, automatic testing requires regular testing, the pitch test angle is large, and the maintenance cost is high. When there is a problem in the communication between the main control system of the wind turbine and the hub pitch system, the main control cannot accurately send instructions to the pitch system, resulting in the three blades not being able to be aligned normally as required. When the three blades are opened at one time during the self-check, if the control system is unable to accurately control and coordinate the movement of the blades at this time, it is easy for the blades to be in an inappropriate position, thereby causing a runaway accident. In addition, when the three blades are opened at one time during the self-check, erroneous control instructions may be issued, causing the blades to move inconsistently with expectations, and effective pitch braking cannot be achieved, resulting in a runaway accident and a low level of safety.

[0005] Therefore, it is necessary to provide a new wind turbine safety detection method. Summary of the invention

[0006] Based on the above problems existing in the prior art, an object of the embodiments of the present invention is to provide a wind turbine safety detection method to ensure the safety of propeller feathering and avoid runaway accidents when three blades are extended at the same time.

[0007] See also Figure 1 To achieve the above-mentioned purpose, on the one hand, the present invention provides a wind turbine safety detection method, which is characterized by comprising:

[0008] S1, when the main control software program in the wind turbine generator set obtains the self-test signal, the wind turbine generator set self-test is started;

[0009] S2, judging whether the wind turbine generator set meets the safety conditions. If the wind turbine generator set meets the safety conditions, the blades are self-checked; if the wind turbine generator set does not meet the safety conditions, the self-check is judged to have failed.

[0010] S3. In response to the wind turbine meeting the safety conditions, control the blade to adjust to the self-check position at a preset speed;

[0011] S4. Conduct an emergency feathering test on each blade one by one. The emergency feathering test for each blade includes judging whether the response signal type, the pitch motor current, and the emergency feathering parameters meet the standards;

[0012] S5. Judge whether all three blades meet the standards. When all three blades meet the standards, the self-check test is successful and the wind turbine starts; otherwise, trigger the corresponding wind turbine fault code and feather to the safe position angle.

[0013] Further, in S1, obtaining the self-check signal through the main control program includes: operating in the shutdown state of the wind turbine, and judging whether the wind turbine is in a fault-free state. If the wind turbine is in a fault state, continue to maintain the shutdown state.

[0014] Further, the fault state includes: the main control software program starts the "start-component self-check" sub-state machine, the wind turbine jumps states according to the state machine, the main states of the wind turbine are stop, start, brake, operation, and maintenance, and the component self-check state is a sub-state under the start main state.

[0015] Further, in S2, the safety check of the wind turbine includes: all three blades are greater than the safety self-check position angle, the impeller speed is less than the impeller start-up speed; the generator speed is less than the generator start-up speed, then the wind turbine is in a safe state and enters the emergency feathering test.

[0016] Further, in S4, the self-check of the emergency feathering test of the wind turbine includes: when the self-check procedures of all three blades are completed, send a self-check test success signal to the main control system, and the wind turbine is in the state of waiting to start after self-check completion.

[0017] Further, the self-check procedure of the blade includes: Step S41, the main control program issues an emergency feathering instruction, monitors the position of the blade before feathering, and disconnects the 24V hardware emergency feathering signal from the nacelle cabinet to the pitch system through the slip ring when the safety chain is closed, and at the same time sends the software emergency feathering signal of the blade through the pitch communication.

[0018] Further, in Step S42, obtain the pitch motor current after reaching the first preset time T1, and judge whether the motor is working normally according to the pitch motor current. If the current is normal, it is determined that the pitch motor current meets the standard. If the current is abnormal, it is determined that the self-check of this blade fails;

[0019] Among them, the first preset time T1 is set by the user according to the test requirements.

[0020] Step S43: After reaching the second preset time T2, determine the type of the pitch system response signal, and judge whether the response signal type meets the standard according to the response signal type;

[0021] Among them, the first preset time T2 is set by the user according to the test requirements, and the response signal types include the hardware emergency pitch-down signal and the software emergency pitch-down signal.

[0022] Step S45: Preset an emergency pitch-down time threshold, and judge whether the emergency pitch-down is overtime according to the emergency pitch-down time threshold.

[0023] Step S46: Judge whether the self-check is passed according to the emergency pitch-down speed and the blade retraction position.

[0024] In a second aspect, a computer-readable storage medium is provided. One or more instructions are stored in the computer-readable storage medium. When the one or more instructions are executed by a processor in a wind turbine, the wind turbine safety detection method involved in the first aspect and any optional implementation manner of the first aspect is implemented.

[0025] In a third aspect, a wind turbine is provided, and the wind turbine includes:

[0026] A memory and a processor;

[0027] At least one program instruction is stored in the memory;

[0028] The processor loads and executes the at least one program instruction to implement the wind turbine safety detection method involved in the first aspect and any optional implementation manner of the first aspect.

[0029] The beneficial effects of the present invention are as follows: The wind turbine safety detection method of the present invention, including the wind turbine safety detection method provided by the first embodiment of the present invention, includes: when the main control software program in the wind turbine obtains a self-check signal, start the self-check of the wind turbine; determine whether the wind turbine meets the safety conditions. When the wind turbine meets the safety conditions, perform a self-check on the blades; if the safety conditions are not met, determine that the self-check fails; in response to the wind turbine meeting the safety conditions, control the blades to adjust to the self-check position at a preset speed; perform an emergency feathering test on each blade one by one. The emergency feathering test of each blade includes determining whether the response signal type, the pitch motor current, and the emergency feathering parameters meet the standards; determine whether all three blades meet the standards. When all three blades meet the standards, the self-check test is successful and the wind turbine starts; otherwise, trigger the corresponding wind turbine fault code, feather to the safe position angle, automatically trigger the self-check function of the emergency feathering test when the wind turbine starts through a preset logic, and judge whether the self-check is successful by monitoring the feathering position and the feathering speed, reducing manual operation, reducing frequent regular monitoring, and reducing the impact on the unit due to a large feathering angle; at the same time, set the three blades of the wind turbine to perform self-checks sequentially, achieving the effect of ensuring feathering safety and avoiding a runaway accident when the three blades are opened simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below in conjunction with the drawings and embodiments.

[0031] In the figure:

[0032] Figure 1 is a flowchart of the wind turbine safety detection method provided by Embodiment 1 of the present invention.

[0033] Figure 2 is a schematic structural diagram of the pitch system according to Embodiment 3 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] The First Embodiment:

[0036] Refer to Figure 1, the first embodiment of the present invention provides a safety detection method for a wind turbine, including: when the main control software program in the wind turbine acquires a self-check signal, starting the self-check of the wind turbine; determining whether the wind turbine meets the safety conditions, and when the wind turbine meets the safety conditions, performing a self-check on the blades; if the safety conditions are not met, determining that the self-check fails; in response to the wind turbine meeting the safety conditions, controlling the blades to adjust to the self-check position at a preset speed; performing an emergency feathering test on each blade one by one, and the emergency feathering test for each blade includes determining whether the response signal type, the pitch motor current, and the emergency feathering parameters meet the standards; determining whether all three blades meet the standards, and when all three blades meet the standards, the self-check test is successful and the wind turbine starts; otherwise, triggering the corresponding wind turbine fault code, feathering to the safe position angle, automatically triggering the self-check function of the emergency feathering test when the wind turbine starts through a preset logic, and determining whether the self-check is successful by monitoring the feathering position and the feathering speed, reducing manual operation, reducing frequent regular monitoring, and reducing the impact on the unit due to a large feathering angle; and in the preset logic, hardware emergency feathering and software emergency feathering processing are set to ensure that the blades can be retracted through software instructions even when the pitch drive does not receive an emergency feathering instruction. At the same time, the three blades of the wind turbine are self-checked sequentially to achieve the effect of ensuring feathering safety and avoiding a runaway accident when the three blades are opened simultaneously.

[0037] The implementation details of the safety detection method for the wind turbine in this embodiment are specifically described below. The following content is only the implementation details provided for convenient understanding and is not necessary for implementing this solution. The specific process of this embodiment is as Figure 1 shown.

[0038] Referring to Figure 1 and Figure 2 for a safety detection method for a wind turbine, this self-check test method includes:

[0039] Step S1: When the main control software program in the wind turbine acquires a self-check signal, start the self-check of the wind turbine.

[0040] Specifically, the operation is performed in the shutdown state of the wind turbine. By determining whether the wind turbine is in a fault-free state, if the wind turbine is in a fault state, it continues to maintain the shutdown state;

[0041] If the wind turbine is in a fault-free state, the main control software program of the wind turbine starts, and the main control software program starts the "start - component self-check" sub-state machine. The wind turbine performs state jumps according to the state machine: there are five main states of the wind turbine: stop, start, brake, operation, and maintenance, and the component self-check state is a sub-state under the start main state; the component self-check state is a set component self-check program, and the main control program acquires the signal of the component self-check to obtain the current state of the wind turbine.

[0042] Step S2: Determine whether the wind turbine meets the safety conditions. When the wind turbine meets the safety conditions, perform a self-check on the blades; if it does not meet the safety conditions, it is determined that the self-check fails.

[0043] Specifically, when the wind turbine meets the following conditions simultaneously, including that all three blades are greater than the safety self-check position angle, the impeller speed (converted to the high-speed shaft speed of the gearbox) is less than the impeller starting speed, and the generator speed is less than the generator starting speed, it is determined at this time that the wind turbine meets the safety conditions. Otherwise, it is determined that the wind turbine does not meet the safety conditions, trigger the corresponding fault code of the wind turbine, disconnect the safety chain, control all blades to feather to the safety position angle, and terminate the startup process.

[0044] Step S3: In response to the wind turbine meeting the safety conditions, control the blades to adjust to the self-check position at a preset speed.

[0045] Specifically, after the wind turbine meets the safety conditions, the wind turbine is in the component self-check state. The main control program outputs control instructions to the pitch drive through the communication protocol. The pitch drive receives the main control instruction, and the pitch drive controls the pitch motor to move the blade to the self-check position through the preset pitch speed and pitch position in the pitch drive.

[0046] Step S4: Conduct an emergency feathering test on each blade one by one. The emergency feathering test for each blade includes judging whether the response signal type, the pitch motor current, and the emergency feathering parameters meet the standards.

[0047] Specifically, by detecting the three blades of the wind turbine one by one, first perform the self-check process of the first blade. When the self-check of the first blade is completed, sequentially perform the self-check of the second and third blades;

[0048] The self-check process of the first blade described above includes:

[0049] When the pitch system moves to the self-check position of pitching at a preset pitch speed;

[0050] Step S41: The main control program issues an emergency feathering instruction, monitors the position of the blade before feathering, and then disconnects the 24V hardware emergency feathering signal from the nacelle cabinet to the pitch system through the slip ring while the safety chain is closed, and at the same time sends the software emergency feathering signal of the blade through the pitch communication.

[0051] Specifically, during the operation of the wind turbine generator set, the main control program controls the operation of the wind turbine generator set. When an emergency occurs, an emergency pitch command is issued through the main control program. Before the pitch operation is executed, the monitoring system of the wind turbine generator set monitors the position of the blade to understand the initial state of the blade, providing accurate position information for the subsequent pitch operation to ensure that the pitch process can proceed in the expected direction and angle. When the safety chain is closed, the 24V hardware emergency pitch signal from the nacelle cabinet to the pitch system through the slip ring is disconnected. In an emergency, a specific power supply path of the pitch system is cut off, enabling the pitch system to act according to the established emergency pitch logic, thereby ensuring the safety of the wind turbine generator set and avoiding more serious faults or damages caused by inappropriate pitch operations.

[0052] Step S42: After reaching the first preset time T1, obtain the pitch motor current, and judge whether the motor is working normally according to the pitch motor current. If the current is normal, it is determined that the pitch motor current meets the standard; if the current is abnormal, it is determined that the self-check of the blade fails.

[0053] Among them, the first preset time T1 is set by the user according to the test requirements;

[0054] Step S43: After reaching the second preset time T2, judge the type of response signal of the pitch system, and judge whether the response signal type meets the standard according to the response signal type.

[0055] Among them, the first preset time T2 is set by the user according to the test requirements, and the response signal type includes the hardware emergency pitch signal and the software emergency pitch signal.

[0056] Specifically, if the wind turbine generator set corresponds to the hardware emergency pitch signal, it enters the emergency shutdown state, the blade pitches successfully, and the blade brake is applied. At this time, if it is determined that the response signal type meets the standard, the self-check program continues; if the hardware emergency pitch signal is not responded to, but the software emergency pitch signal is responded to, at this time, it is determined that the response signal type does not meet the standard, then the pitch emergency retraction is triggered and stopped at the software emergency stop angle given by the main control. For the fault of not stopping at the hardware limit, continue the software pitch to the normal shutdown angle of the blade, and the brake is not applied, and the self-check fails.

[0057] Step S44: Judge whether the emergency pitch parameters of the pitch system meet the standard. The emergency pitch parameters include the blade positions before and after pitching, the emergency pitch speed, and the pitch time threshold.

[0058] Record the blade positions before and after the emergency pitch brake and the emergency pitch speed after the emergency pitch ends;

[0059] Specifically, when the emergency feathering action is completed, the system of the wind turbine will record in detail the blade position at the end of the emergency feathering, as well as the change in the blade position before and after the emergency feathering brake is triggered. By comparing the blade position data before and after the brake, the deflection amplitude and the in-place situation of the blade during the feathering process can be evaluated, providing a basis for subsequent fault troubleshooting and performance analysis. During the subsequent process of handling problems or troubleshooting, it can achieve the effects of quickly locating problems, optimizing system parameters, and ensuring the reliable operation and safety of the wind turbine in case of emergencies.

[0060] For each blade, the emergency feathering test includes determining that when the response signal type, the pitch motor current, and the emergency feathering parameters all meet the standards, it is determined that the self-check of this blade meets the standards.

[0061] The emergency feathering parameters include pitch angle parameters and feathering speed parameters. Among them, the pitch angle parameters include the starting pitch angle, the safe position pitch angle, and the stop position pitch angle, and the feathering speed parameters include the preset maximum feathering speed and the law of change of the feathering speed during the deceleration stage.

[0062] The pitch motor current includes two types: normal operating current and emergency feathering current.

[0063] The response signal types include safety chain signal, external emergency stop signal, grid power failure signal, encoder fault signal, and pitch angle deviation signal.

[0064] By comparing whether the specific corresponding values within the above-mentioned response signal types, pitch motor current, and emergency feathering parameters meet the standards, it is further determined whether the self-check of the blade meets the standards.

[0065] After the self-check of the first blade meets the standards, the second blade and the third blade are successively subjected to the detection procedures of steps S41 - S46.

[0066] Step S45, preset an emergency feathering time threshold, and determine whether the emergency feathering is timed out according to the emergency feathering time threshold;

[0067] Specifically, by comparing the preset feathering time threshold with the emergency feathering time value recorded in the wind turbine system, it is determined whether the emergency feathering is timed out. If it is timed out, it is determined that the self-check fails.

[0068] Step S46, determine whether it passes the self-check based on the emergency feathering speed and the blade retraction position.

[0069] Step S5, determine whether all three blades meet the standards. When all three blades meet the standards, the self-check test is successful and the wind turbine starts; otherwise, the corresponding wind turbine fault code is triggered and the blades are feathered to the safe position angle.

[0070] After the three blades complete the self-check procedure and all meet the standards, a self-test success signal is sent to the main control system. The wind turbine is in the state of waiting to start after the self-check is completed. If any one of the blades fails to meet the standards, the corresponding wind turbine fault code is triggered, and the wind turbine returns to the fault state and shuts down.

[0071] Specifically, when all three blades have completed the self-check, the sensors on the three blades will send a self-check success signal to the main control system. After receiving this signal, the main control system will update the status of the wind turbine to "waiting to start after self-check completed", which means that the wind turbine has passed the initial safety and function checks and can enter the next startup process. In this state, the wind turbine will wait for a further startup command, usually determined by wind speed, grid demand, and other environmental and operating conditions to decide whether to officially start operating.

[0072] Specifically, first, the main control program enters the "start-up - component self-check" sub-state machine; then, it conducts a safety check on the wind turbine. When the conditions are met that all three blades are greater than the safety self-check position angle, the impeller speed (converted to the high-speed shaft speed of the gearbox) is less than the impeller starting speed; and the generator speed is less than the generator starting speed, it enters the emergency feathering test. First, it conducts the self-check process of one blade. When one self-check is completed, it sequentially self-checks the second and third blades. The following is the self-check process of one blade: the pitch system moves to the self-check position of pitching at a preset pitch speed; the main control program issues an emergency feathering command. When the safety chain is closed, it disconnects the 24V hardware emergency feathering signal from the nacelle cabinet to the pitch system through the slip ring, and at the same time sends the software emergency feathering signal of the blade through the pitch communication; after T1 seconds, it checks the pitch motor current to determine that the pitch motor is working normally; after T2 seconds, it judges whether the pitch system responds to the hardware emergency feathering signal or the software emergency feathering signal; if it responds to the hardware emergency feathering signal, it enters the emergency shutdown state, the blade feathers successfully, and the blade brake is applied; if it does not respond to the hardware emergency feathering signal but responds to the software emergency feathering signal, it triggers the pitch emergency retraction and stops at the software emergency stop angle given by the main control. If there is a fault that it does not stop at the hardware limit position, it continues to software feather to the normal shutdown angle of the blade and does not apply the brake, and the self-check fails. Then, after the emergency feathering ends, it monitors the position of the blade after the emergency feathering, calculates the emergency feathering speed, judges whether the emergency feathering times out, and finally judges whether it passes the self-check based on the emergency feathering speed and the retraction position. When all three blades pass the self-check, the self-test is successful.

[0073] The wind turbine safety detection method provided by the first embodiment of the present invention includes: when the main control software program in the wind turbine obtains a self-check signal, starting the self-check of the wind turbine; determining whether the wind turbine meets the safety conditions, and when the wind turbine meets the safety conditions, performing a self-check on the blades; if the safety conditions are not met, determining that the self-check fails; in response to the wind turbine meeting the safety conditions, controlling the blades to adjust to the self-check position at a preset speed; performing an emergency feathering test on each blade one by one, and the emergency feathering test for each blade includes determining whether the response signal type, the pitch motor current, and the emergency feathering parameters meet the standards; determining whether all three blades meet the standards, and when all three blades meet the standards, the self-check test is successful and the wind turbine starts; otherwise, triggering the corresponding wind turbine fault code, feathering to the safe position angle, automatically triggering the self-check function of the emergency feathering test when the wind turbine starts through a preset logic, and determining whether the self-check is successful by monitoring the feathering position and the feathering speed, reducing manual operation, reducing frequent regular monitoring, and reducing the impact on the unit due to a large feathering angle; and in the preset logic, hardware emergency feathering and software emergency feathering processing are set to ensure that the blades can be retracted through software instructions even when the pitch drive does not receive an emergency feathering instruction. At the same time, the three blades of the wind turbine are self-checked sequentially to achieve the effect of ensuring feathering safety and avoiding a runaway accident when the three blades are opened simultaneously.

[0074] The step division of the above various methods is only for clear description. When implemented, they can be combined into one step or some steps can be split into multiple steps. As long as the same logical relationship is included, they are all within the protection scope of this patent; adding insignificant modifications to the algorithm or process or introducing insignificant designs, but not changing the core design of its algorithm and process are all within the protection scope of this patent.

[0075] Embodiment 2. An embodiment of the present invention also provides a computer-readable storage medium. One or more instructions are stored in the computer-readable storage medium. When the one or more instructions are executed by a processor in the wind turbine, the wind turbine safety detection method involved in any of the above embodiments is implemented.

[0076] Embodiment 3. An embodiment of the present invention also provides a wind turbine, which includes: a memory and a processor; at least one program instruction is stored in the memory; the processor loads and executes the at least one program instruction to implement the wind turbine safety detection method involved in any of the above embodiments.

[0077] As Figure 2 shown, the wind turbine includes a main control system, and the main control system is connected to the pitch system through a slip ring for 400V power supply cables, 230V cables, 24V signal cables, and pitch communication cables.

[0078] After the master control system is connected to the slip ring through the 400V power supply cable, 230V cable, 24V signal cable and pitch communication cable, the slip ring is connected to the pitch axis control cabinet A, pitch axis control cabinet B and pitch axis control cabinet C through the 00V power supply cable, 230V cable, 24V signal cable and pitch communication cable. Pitch drivers are provided in the pitch axis control cabinet A, pitch axis control cabinet B and pitch axis control cabinet C, and the pitch axis control cabinet A, pitch axis control cabinet B and pitch axis control cabinet C drive three blade paddles respectively.

[0079] That is, those skilled in the art can understand that all or part of the steps in the methods of the above embodiments can be completed by instructing relevant hardware through a program. This program is stored in a storage medium, including several instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor to execute all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks or optical discs that can store program codes.

[0080] The above are only embodiments of the present invention. Specific structures and common knowledge such as characteristics that are well-known in the art are not described in detail here. Those of ordinary skill in the art know all the common technical knowledge in the technical field to which the invention belongs before the application date or the priority date, can know all the existing technologies in this field, and have the ability to apply conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given in this application, combine their own abilities to improve and implement this solution. Some typical well-known structures or well-known methods should not be an obstacle for those of ordinary skill in the art to implement this application. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

[0081] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A safety detection method for a wind turbine unit, characterized in that, Including: S1. When the main control software program in the wind turbine obtains the self - test signal, it starts the self - test of the wind turbine. S2. Judge whether the wind turbine meets the safety conditions. When the wind turbine meets the safety conditions, it conducts a self - test on the blades; if it does not meet the safety conditions, it judges that the self - test fails. S3. In response to the wind turbine meeting the safety conditions, control the blades to adjust to the self - test position at a preset speed. S4. Conduct an emergency feathering test on each blade one by one. The emergency feathering test for each blade includes judging whether the response signal type, the pitch motor current, and the emergency feathering parameters meet the standards. S5. Judge whether all three blades meet the standards. When all three blades meet the standards, the self - test is successful and the wind turbine starts; otherwise, trigger the corresponding wind turbine fault code and feather to the safe position angle.

2. The wind turbine safety detection method according to claim 1, wherein In S1, obtaining the self - test signal through the main control program includes: operating in the shutdown state of the wind turbine, and judging whether the wind turbine is in a fault - free state. If the wind turbine is in a fault state, it continues to maintain the shutdown state.

3. The wind turbine safety detection method according to claim 2, characterized in that The fault state includes: the main control software program starts the "start - component self - test" sub - state machine, the wind turbine jumps states according to the state machine, the main states of the wind turbine are stop, start, brake, operation, and maintenance, and the component self - test state is a sub - state under the start main state.

4. The wind turbine safety detection method according to claim 1, wherein, In S2, the safety inspection of the wind turbine includes: all three blades are greater than the safety self - test position angle, the impeller speed is less than the impeller start - up speed; the generator speed is less than the generator start - up speed, then the wind turbine is in a safe state and enters the emergency feathering test.

5. The wind turbine safety detection method according to claim 1, wherein, In S4, the self - inspection of the emergency feathering test of the wind turbine includes: when all three blades complete the self - test program, send a self - test success signal to the main control system, and the wind turbine is in the state of waiting to start after self - inspection.

6. The wind turbine safety detection method according to claim 5, wherein The self - test program of the blade includes: Step S41, the main control program issues an emergency feathering command, monitors the position of the blade before feathering, and disconnects the 24V hardware emergency feathering signal from the nacelle cabinet to the pitch system through the slip ring when the safety chain is closed, and at the same time sends the software emergency feathering signal of the blade through pitch communication.

7. The wind turbine safety detection method according to claim 6, wherein Step S42, after reaching the first preset time T1, obtain the pitch motor current, and judge whether the motor is working normally according to the pitch motor current. If the current is normal, it is determined that the pitch motor current meets the standard; if the current is abnormal, it is determined that the self - test of this blade fails. Among them, the first preset time T1 is set by the user according to the test requirements. Step S43, after reaching the second preset time T2, judge the response signal type of the pitch system, and judge whether the response signal type meets the standard according to the response signal type. Among them, the first preset time T2 is set by the user according to the test requirements, and the response signal type includes the hardware emergency feathering signal and the software emergency feathering signal.

8. The wind turbine safety detection method according to claim 6, characterized in that, Step S44, record the blade positions and emergency feathering speeds before and after the emergency feathering brake at the end of the emergency feathering. Step S45, preset an emergency feathering time threshold, and judge whether the emergency feathering is overtime according to the emergency feathering time threshold. Step S46, judge whether it passes the self - test through the emergency feathering speed and the blade retraction position.

9. A computer-readable storage medium storing one or more instructions, characterized in that, When the one or more instructions are executed by a processor in a wind turbine, the wind turbine safety detection method according to any one of claims 1 to 8 is implemented.

10. A wind turbine, characterized in that, The wind turbine includes: a memory and a processor; at least one program instruction is stored in the memory; The processor implements the wind turbine safety detection method according to any one of claims 1 to 8 by loading and executing the at least one program instruction.

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