Shutdown control method, apparatus, and wind turbine generator system

Abstract

The present disclosure provides a shutdown control method, device and wind turbine generator set. The shutdown control method comprises: in response to the wind turbine generator set triggering a shutdown fault, determining whether a variable pitch system is in an open pitch operating state; and in response to the variable pitch system being in the open pitch operating state, controlling the variable pitch motor to stop and then execute a feathering speed to drive the blades to feather to a safe position. The shutdown control method according to the embodiment of the present disclosure can reduce the impact of the sudden change of the large electromagnetic torque on the wind turbine generator set and improve the safety of the wind turbine generator set.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of wind power, in particular, to a shutdown control method and device of a wind turbine generator system, a computer readable storage medium and a wind turbine generator system. BACKGROUND

[0002] Currently, when the wind turbine generator system fails, a pitch system is generally immediately sent a feathering instruction and a feathering speed, and at this time, if the pitch system is adjusting the pitch in the opening direction, due to the fast speed during emergency feathering and the large mass (generally greater than 6 tons) and moment of inertia of the blade, suddenly sending a reverse speed command will cause the pitch motor to suddenly reverse while rotating forward, which will generate a large vibration and be transmitted to the wind turbine generator system through the mechanical structure, causing the nacelle of the wind turbine generator system to vibrate.

[0003] In addition, when the pitch motor is in emergency braking, the excessive inertia from the blade will turn the motor into a generator, and the motor will reverse to power the frequency converter, which will cause the frequency converter to overvoltage alarm. In order to release this part of the energy, currently, the kinetic energy after the pitch motor braking is stopped and the magnetic energy stored in the coil are consumed by a power consumption element (such as a braking resistor), so as to achieve rapid shutdown. After emergency feathering and triggering the limit switch, the pitch system will immediately set the control speed of the pitch motor to 0, which will increase the unloading pressure of the braking resistor.

[0004] Furthermore, due to the large mass and moment of inertia of the blade, the pitch motor will generate a large fluctuation in braking current and torque during emergency braking, which may easily cause the drive to trigger a fault due to vibration or sudden change in the given speed (for example, a change frequency greater than 16 Hz), causing the blade to be stuck in the pitch, which endangers the safety of the entire wind turbine generator system. SUMMARY

[0005] One of the purposes of the present disclosure is to provide a shutdown control method capable of reducing the impact of sudden changes in large electromagnetic torque on the wind turbine generator system.

[0006] One of the purposes of the present disclosure is to provide a shutdown control method capable of improving the safety of the wind turbine generator system.

[0007] According to a first aspect of the present disclosure, a shutdown control method of a wind turbine generator system is provided, the shutdown control method comprising: in response to the wind turbine generator system triggering a shutdown fault, determining whether a pitch system is in an opening pitch operating state; in response to the pitch system being in the opening pitch operating state, controlling a pitch motor to execute a feathering speed after stopping rotation, so as to drive a blade to feather to a safe position.

[0008] According to an embodiment of the present disclosure, the shutdown control method of the wind turbine generator system can further include: in response to the pitch system being in the non-pitching operation state, controlling the pitch motor to directly execute a feathering speed to drive the blades to feather to a safe position.

[0009] According to an embodiment of the present disclosure, the step of judging whether the pitch system is in the pitching operation state can include: judging whether the rotation speed of the pitch motor is 0; in response to the rotation speed of the pitch motor not being 0, judging whether the pitch speed is a negative value; and in response to the pitch speed being the negative value, determining that the pitch system is in the pitching operation state.

[0010] According to an embodiment of the present disclosure, the step of controlling the pitch motor to execute the feathering speed after being stopped in response to the pitch system being in the pitching operation state can include: in response to the pitch system being in the pitching operation state, sending a 0 value pitch speed to the pitch motor to control the pitch motor to be stopped; and in response to the rotation speed of the pitch motor being 0, sending the feathering speed to the pitch motor to drive the blades to feather to the safe position.

[0011] According to an embodiment of the present disclosure, in response to the wind turbine generator system triggering a shutdown fault, the shutdown control method can further include: setting a fault trigger flag to 1; and the step of controlling the pitch motor to be stopped in response to the pitch system being in the pitching operation state includes: in response to the pitch system being in the pitching operation state and the fault trigger flag being 1, sending a 0 value pitch speed to the pitch motor to control the pitch motor to execute a stop strategy according to the 0 value pitch speed within a first preset time.

[0012] According to an embodiment of the present disclosure, the step of controlling the pitch motor to execute the feathering speed after being stopped can include: in response to the fault trigger flag being constantly 1 and lasting a second preset time, sending the feathering speed to the pitch motor to drive the blades to feather to the safe position.

[0013] According to an embodiment of the present disclosure, in response to the fault trigger flag being reset within the second preset time, a normal pitch command is sent to the pitch motor to drive the blades to normally pitch.

[0014] According to a second aspect of the present disclosure, a computer readable storage medium storing a computer program is provided, when the computer program is executed by a processor, the processor is caused to execute the shutdown control method of the wind turbine generator system as described above.

[0015] According to a third aspect of the present disclosure, a shutdown control device of a wind turbine generator system is provided, the shutdown control device includes: a processor; and a memory storing a computer program, wherein when the computer program is executed by the processor, the processor is caused to execute the shutdown control method of the wind turbine generator system as described above.

[0016] According to a fourth aspect of the present disclosure, there is provided a wind turbine generator system comprising the shutdown control device as described above.

[0017] The shutdown control method according to the embodiments of the present disclosure is low in cost, can reduce or eliminate the impact and vibration on the system when the wind turbine is urgently pitched, and can effectively reduce the unloading pressure of the brake resistor and the current and torque when the pitch motor brakes.

[0018] The shutdown time of the pitch motor in the shutdown control method according to the embodiments of the present disclosure is very short, and therefore does not affect the safety of the wind turbine generator system.

[0019] The shutdown control method according to the embodiments of the present disclosure can not form a short shutdown time interval. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and other objects and features of the present disclosure will become more apparent from the following description of embodiments thereof taken in conjunction with the accompanying drawings, in which:

[0021] Figure 1 is a schematic diagram showing the electrical connection relationship of the pitch system according to an embodiment of the present disclosure.

[0022] Figure 2 is a flowchart showing a shutdown control method of a wind turbine generator system according to a first embodiment of the present disclosure.

[0023] Figure 3 is a flowchart showing a shutdown control method of a wind turbine generator system according to a second embodiment of the present disclosure.

[0024] Figure 4 is a flowchart showing a shutdown control method of a wind turbine generator system according to a third embodiment of the present disclosure.

[0025] Figure 5 is a flowchart showing a shutdown control method of a wind turbine generator system according to a fourth embodiment of the present disclosure.

[0026] Figure 6 is a block diagram showing a shutdown control device of a wind turbine generator system according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] Preferred embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. Like reference numerals indicate like elements throughout the drawings. The terms used in the present disclosure are briefly described below.

[0028] The pitch state generally includes two states of feathering (or retraction) and opening. The feathering refers to a control process of turning the blades of the wind turbine to a state of being approximately parallel to the wind direction (also referred to as a safe position, in a specific angle, a position of about 89 degrees of the blades, at which the wind turbine blades absorb the least wind energy, and can play a role of aerodynamic brake to make the wind turbine stop safely) after the wind turbine fails. The opening refers to a control process of adjusting the blades of the wind turbine to a certain angle (in a specific angle, a position of about 0 degrees of the blades, at which the wind turbine blades absorb the most wind energy) with the wind direction.

[0029] Figure 1 FIG. 1 is a schematic diagram showing an electrical connection relationship of a pitch system according to an embodiment of the present disclosure.

[0030] As shown in FIG. 1, each shaft has corresponding pitch controller 110, pitch driver 120 and pitch motor 130, and a corresponding number of backup power supplies (not shown). Figure 1

[0031] The main controller 100 of the wind turbine is connected to the pitch controller 110 of the blades of each shaft (the first shaft, the second shaft and the third shaft).

[0032] When the blades of each shaft need to be pitched, the pitch controller 110 first calculates the current pitch angle of the blades according to the electrical signal output by the encoder installed on the shaft of the pitch motor 130 of the blades, then generates a pitch instruction for controlling the speed of the pitch motor 130 according to the difference between the current pitch angle and the target pitch angle, and issues the pitch instruction to the pitch driver 120, so that the pitch driver 120 controls the pitch motor 130 to pitch according to the pitch instruction.

[0033] The pitch motor 130 of the pitch system is controlled by the pitch driver 120 and belongs to electric braking. When the DC voltage is higher than the upper limit value, the braking unit of the pitch system is turned on, the charge on the filter capacitor is discharged through the braking resistor, and the speed of the discharge will exceed the speed of the charging, so the DC voltage decreases.

[0034] When the DC voltage is lower than the hysteresis voltage, the braking unit is cut off, and the filter capacitor stops discharging. Since the regenerative braking process is still continuing, the DC voltage will rise again, causing the temperature of the braking resistor to rise and the vibration of the pitch motor.

[0035] ​According to an embodiment of the present disclosure, when the wind turbine generator set triggers a fault, the pitch motor is controlled to stop pitching first and then to pitch to feather according to the previous pitch speed, so as to reduce the impact on the wind turbine generator set when the wind turbine generator set is suddenly stopped in an emergency. In addition, when the wind turbine generator set triggers a fault and the wind turbine generator set or the pitch system is in a pitch running state, the pitch motor can be first stopped and then controlled to pitch to feather.

[0036] For example, the pitch system can automatically execute the stop or stop operation of the pitch motor after receiving the emergency stop signal or the emergency stop feathering speed sent by the main controller, and then execute the feathering speed sent by the main controller after the pitch speed (for example, the rotating speed of the pitch motor) becomes 0.

[0037] The stop control method of the wind turbine generator set according to all embodiments of the present disclosure can be executed by the main controller 100 or the pitch controller 110 as described above, or can be executed on a third-party platform independent of the main controller and the pitch controller. As an example, the stop control method can also be executed by at least two of the main controller 100, the pitch controller 110 and the third-party platform jointly. Figure 1

[0038] Figure 2 is a flowchart showing the stop control method of the wind turbine generator set according to the first embodiment of the present disclosure.

[0039] According to the first embodiment of the present disclosure, the stop control method of the wind turbine generator set can include a step S210 of further judging whether the pitch system is in a pitch running state when the wind turbine generator set triggers a stop fault, and a step S220 of controlling the pitch motor 130 to stop and then to pitch to feather when the pitch system is in the pitch running state.

[0040] Specifically, in step S210, it can be judged whether the pitch system is in a pitch running state in response to the wind turbine generator set triggering a stop fault.

[0041] The wind turbine generator set may, for example, occur and trigger a fault due to a safety chain disconnection, an encoder failure, etc., and eventually cause the wind turbine generator set to stop.

[0042] According to the first embodiment of the present disclosure, when the wind turbine generator set triggers a stop fault, it can be further judged whether the pitch system is in a pitch running state. The step of judging whether the pitch system is in a pitch running state can be executed by the main controller 100 or the pitch controller 110, or by a third-party platform independent of the main controller 100 and the pitch controller 110.

[0043] ​Whether the wind turbine generator triggers a shutdown fault can be determined by whether the corresponding executing subject receives a fault signal, an emergency feathering signal, etc., or can be directly determined by a detection signal of a related component.

[0044] At step S220, in response to the pitch system being in the unfeathering operation state, the control is performed to stop the pitch motor 130 and then execute a feathering speed to drive the blades to feather to a safe position.

[0045] For example, the main controller 100 can control the pitch motor 130 to stop (i.e., the rotation speed of the pitch motor 130 becomes 0) in a case where it is determined that the pitch system is in the unfeathering operation state, and then send a feathering speed to the pitch motor (specifically, a feathering instruction and a feathering speed instruction can be sent to the pitch controller 110, and the pitch controller 110 controls the pitch driver 120 to drive the pitch motor 130 to execute feathering, so that the blades are feathered to a safe position).

[0046] In one example, the shutdown or stop control of the pitch motor 130 can use a PID (proportional-integral-derivative) control strategy to gradually reduce the speed of the pitch motor 130 to 0. Since the PID control strategy controls the speed of the pitch motor 130 to gradually reduce the speed of the pitch motor, the impact on the wind turbine generator is smaller than when the speed of the pitch motor is directly set to 0.

[0047] As an example, sending a 0 value pitch speed control signal (or a pitch speed instruction) to the pitch motor can also be achieved by disconnecting the pitch enabling signal (switching quantity) of the pitch driver.

[0048] In one example, when feathering, the pitch speed is positive, and the pitch motor rotates forward; when unfeathering, the pitch speed is negative, and the pitch motor rotates in reverse. In another example, the rotation direction of the motor and the positive and negative of the pitch speed when feathering or unfeathering can be additionally set correspondingly.

[0049] In response to the pitch system being in a non-unfeathering operation state (e.g., a feathering operation state or a non-pitching state), the control is performed to directly execute a feathering speed to drive the blades to feather to a safe position.

[0050] That is, if the pitch system is in a non-unfeathering operation state, the control can be performed to directly execute a feathering speed to the pitch motor.

[0051] In terms of the execution subject, when executed by the master controller 100, the master controller 100 can control a control signal for stopping the pitch motor to be sent to the pitch controller under the condition that it is determined that the pitch system is in the open pitch operating state, in addition, the master controller 100 can send a feathering control signal to the pitch controller in response to receiving a feedback signal from the pitch controller indicating that the pitch motor has stopped, so that the pitch motor executes the feathering speed. The feathering speed of the pitch motor can be proportional to the pitch-in speed of the blade, which can be determined in advance according to the gear ratio, etc.

[0052] When executed by the pitch controller 110, the pitch controller can send a control signal for controlling the pitch motor to stop to the pitch driver under the condition that the wind turbine generator set is in the open pitch operating state and the pitch controller receives an emergency stop or feathering instruction, and send another control signal to the pitch driver in response to receiving a feedback signal that the pitch motor has stopped, so that the pitch motor operates in the feathering state and drives the blade to pitch in.

[0053] The shutdown control method of the wind turbine generator set of the present disclosure can reduce or eliminate the impact on the set when the wind turbine generator set is in an emergency feathering state, and reduce the vibration generated thereby, and can effectively reduce the unloading pressure of the brake resistor and the current and torque of the pitch motor when braking.

[0054] As an example, whether the pitch system is in the open pitch operating state can be determined according to the speed of the pitch motor.

[0055] Figure 3 is a flowchart showing a shutdown control method of a wind turbine generator set according to a second embodiment of the present disclosure.

[0056] As Figure 3 shown, the step of determining whether the pitch system is in the open pitch operating state can include steps S310, S320 and S330.

[0057] In step S310, whether the rotational speed of the pitch motor is 0 can be determined.

[0058] Whether the rotational speed of the pitch motor is 0 can be determined by an encoder, the current of the pitch motor, etc. For example, the pitch speed value can be calculated based on the angle value of the encoder by collecting the angle value of the encoder.

[0059] In step S320, in response to the rotational speed of the pitch motor not being 0, whether the pitch speed is a negative value is determined.

[0060] As an example, whether the pitch speed is a negative value can be related to the rotation direction of the pitch motor, etc., whether the pitch speed is a negative value can be determined according to the rotation direction of the pitch motor, or whether the pitch speed is a negative value can be determined according to the angle value of the encoder collected.

[0061] The feathering speed can be sent to the variable pitch motor when the rotation speed of the variable pitch motor is 0, so that the variable pitch motor executes the feathering speed. For example, the feathering instruction and the feathering speed instruction including the predetermined feathering speed can be sent to the variable pitch driver, so that the variable pitch driver controls the variable pitch motor to execute the feathering according to the feathering speed.

[0062] In step S330, it is determined that the variable pitch system is in the feathering operation state in response to the variable pitch speed being a negative value.

[0063] As described above, the variable pitch system is in the feathering operation state when the variable pitch speed is a negative value, which is only a pre-set corresponding relationship or association. As an example, the variable pitch system can also be determined to be in the feathering operation state when the variable pitch speed is a positive value, in which case the determination of the feathering operation state can be adaptively changed.

[0064] Although Figure 3 Although not shown in the above embodiments, in response to the rotation speed of the variable pitch motor being 0, the variable pitch motor can directly execute the feathering speed (i.e., execute the feathering according to the predetermined feathering speed included in the feathering speed instruction).

[0065] In addition, in response to the variable pitch speed being a positive value, it can be determined that the variable pitch system is in the feathering operation state, and therefore the variable pitch motor can directly execute the feathering speed.

[0066] Figure 4 is a flowchart showing a shutdown control method of a wind turbine generator system according to a third embodiment of the present disclosure.

[0067] The shutdown control method of the wind turbine generator system according to the third embodiment of the present disclosure can include a variable pitch motor stall control step when the variable pitch system is in the feathering state, and a feathering control step after the variable pitch motor stalls.

[0068] Specifically, according to the third embodiment of the present disclosure, the shutdown control method can include steps S410, S420, S430 and S440.

[0069] In step S410, it is determined whether the variable pitch system is in the feathering operation state. The specific feathering operation state determination method can be as described above, and will not be described here again.

[0070] In step S420, in response to the variable pitch system being in the feathering operation state, a 0 value variable pitch speed is sent to the variable pitch motor to control the variable pitch motor to stall.

[0071] As an example, the shutdown or stall of the variable pitch motor 130 can be controlled using a PID control strategy, which can gradually reduce the speed of the variable pitch motor, which is less impact on the wind turbine generator system than directly setting the speed of the variable pitch motor to 0.

[0072] In a specific implementation, the pitch controller can issue a pitch command to the pitch driver in response to the pitch system being in the open pitch operating state, so that the pitch driver controls the pitch motor to drive the blades to pitch according to the pitch command.

[0073] When the pitch system is in a non-open pitch operating state (for example, a feathering operating state or a non-pitching state), the feathering speed can be directly sent to the pitch motor to directly execute feathering.

[0074] In step S430, it is determined whether the rotation speed of the pitch motor is 0. For example, whether the rotation speed of the pitch motor is 0 can be calculated according to the angle value of the encoder.

[0075] In step S440, in response to the rotation speed of the pitch motor being 0, the feathering speed is sent to the pitch motor to drive the blades to feather to a safe position.

[0076] Specifically, the feathering command including the predetermined feathering speed is sent to the pitch motor to control the pitch motor to execute feathering at the predetermined feathering speed.

[0077] Although Figure 4 Although not shown in the above embodiments, in response to the system being in a non-open pitch operating state, the pitch motor can directly execute the feathering speed. In response to the rotation speed of the pitch motor being 0, the pitch motor can also directly execute the feathering speed (i.e., execute feathering at the predetermined feathering speed included in the feathering speed command).

[0078] According to the embodiments of the present disclosure, a fault trigger flag can be set, the trigger time of the fault trigger flag being earlier than the normal time by a predetermined time, when the fault condition reaches the trigger time of the fault trigger, the corresponding fault trigger flag bit is triggered, and the feathering speed sent to the pitch motor is set to 0.

[0079] Figure 5 FIG. 4 is a flowchart illustrating a shutdown control method of a wind turbine generator system according to a fourth embodiment of the present disclosure.

[0080] As an example, the fault trigger flag can be set to 1 when the wind turbine generator system triggers a shutdown fault.

[0081] According to the fourth embodiment of the embodiments of the present disclosure, the shutdown control method can include S510 and S520.

[0082] In step S510, in response to the wind turbine generator system triggering a shutdown fault, the fault trigger flag is set to 1.

[0083] The flag bit here can be an existing flag bit in the original control strategy, or can be a flag bit set additionally.

[0084] The trigger condition of the fault trigger flag position 1 can be that the fault duration reaches a predetermined time, which can be shorter than the original fault condition reaching time, that is, the delay time is earlier than the normal fault trigger time by a predetermined time. Therefore, the shutdown control of the pitch motor can be performed in advance.

[0085] In step S520, in response to the pitch system being in the pitch operation state and the fault trigger flag being 1, a 0 value pitch speed is sent to the pitch motor to control the pitch motor to perform the shutdown strategy according to the 0 value pitch speed within the first preset time.

[0086] That is, the shutdown control of the pitch motor can be performed before the original fault condition reaching time, and the shutdown control of the pitch motor can be completed within a predetermined time before or after the original fault condition reaching time.

[0087] In one example, by setting the above-mentioned fault duration and the original fault condition reaching time, etc., the pitch motor can be shut down in a short time under the premise of reducing the impact, and the adverse effects on the safety of the wind turbine generator set can be reduced. Even a short downtime interval can not be formed.

[0088] Step S510 can be part of step S210, and step S520 can be part of step S220.

[0089] According to a fourth embodiment of the embodiments of the present disclosure, the shutdown control method can further include S530.

[0090] In step S530, in response to the fault trigger flag being constantly 1 and lasting for a second preset time (at this time, it means that the pitch motor has been shut down or stopped), a pitch-in speed is sent to the pitch motor to drive the blades to pitch in to a safe position. The second preset time is greater than the first preset time. Step S530 can also be part of step S220.

[0091] As an example, if the fault trigger flag is reset (the fault trigger flag is reset to 0) within the second preset time, normal pitch can be performed. Specifically, in response to the fault trigger flag being reset within the second preset time, a normal pitch command can be sent to the pitch motor to drive the blades to normally pitch.

[0092] For example, the time from triggering of a certain fault to execution of a subsequent protection action is 2000 ms, according to the scheme of the present disclosure, this period of time can be divided into two parts, wherein the former part of time is used for pitch motor shutdown control, and the latter part of time is used for fault reconfirmation to determine whether it is necessary to continue to execute the feathering control. In a specific implementation, after triggering of a certain fault, a fault triggering flag is set to 1, the maintenance time of the flag is 1800 ms, from the time when the fault triggering flag is set to 1 to the 1800 ms delay, if the pitch motor is in the open pitch operating state, a shutdown control signal can be sent to the pitch motor to make the pitch motor execute the shutdown according to the 0 value pitch speed within 1800 ms. If the fault triggering flag is 1 and lasts for 2000 ms, the pitch motor can be sent to the pitch speed to control the pitch motor to execute the pitch collection. Therefore, a short shutdown time interval can not be formed. If the pitch motor is in a non-open pitch state when the fault triggering flag is just set to 1, the 2000 ms can be executed, if the fault triggering flag is still 1 at this time, the pitch collection speed is executed, and if the fault triggering flag is 0 at the time of 2000 ms, the normal pitch adjustment speed can be executed.

[0093] Each operation of the above steps can be written as a software program or instruction, therefore, the shutdown control method of the wind power generating unit according to the exemplary embodiments of the present disclosure can be implemented via software, and the computer readable storage medium of the exemplary embodiments of the present disclosure can store a computer program, when the computer program is executed by a processor, the shutdown control method of the wind power generating unit according to the above exemplary embodiments is implemented.

[0094] The computer readable storage medium includes magnetic media such as floppy disks and magnetic tapes, optical media (including CD ROM and DVD ROM), magneto-optical media such as a flexible disc, hardware devices designed to store and execute program commands such as ROM, RAM, and flash memory. The program commands include language codes executable by a computer using an interpreter and machine language codes generated by a compiler. The above hardware devices can be implemented by one or more software modules for executing the operations of the various embodiments of the present disclosure.

[0095] As shown in the main controller Figure 1 may include a memory and a processor, the memory can store the above instructions or codes, when the instructions or codes are executed by the processor, the above shutdown control method can be executed.

[0096] As shown in the main controller Figure 1The illustrated pitch controller can include a pitch control module that can be configured to control the pitch motor to perform a pitch-in speed in response to a pitch control signal (e.g., a pitch-in command and / or a pitch-in speed command) received from the main controller. Both the main controller and / or the pitch controller described above can be part of a pitch system or a wind turbine generator system.

[0097] Figure 6 is a block diagram illustrating a shutdown control device of a wind turbine generator system according to an embodiment of the present disclosure.

[0098] As Figure 6 illustrated, the shutdown control device 600 according to an embodiment of the present disclosure includes a processor 610 and a memory 620, which can be a computer readable storage medium as described above, and the memory 620 can have stored therein a computer program that, when executed by the processor 610, causes the processor 610 to perform the shutdown control method of a wind turbine generator system as described above.

[0099] It should be noted that the above steps can be executed by the processor 610 after loading each software module or programming module in the memory 620.

[0100] According to an embodiment of the present disclosure, at least a part of the modules or units can be implemented (e.g., executed) by a processor. At least a part of the programming module can include a module, a program, a routine, an instruction set, and a process for performing at least one function. In one example, the instructions or software include machine code (such as machine code generated by a compiler) directly executed by one or more processors or computers. In another example, the instructions or software include higher-level code that is executed by one or more processors or computers using an interpreter. The instructions or software can be written based on the block diagrams and flowcharts in the accompanying drawings and corresponding descriptions in the specification using any programming language.

[0101] The modules or programming modules of the present disclosure can include at least one of the aforementioned components with some components omitted or other components added. The operations of the modules, programming modules, or other components can be executed sequentially, in parallel, cyclically, or heuristically. In addition, some operations can be executed in different orders, can be omitted, or can be extended with other operations.

[0102] The shutdown control device described above can also be part of a wind turbine generator system. The shutdown control device can be a device including a main controller, a pitch controller, or a device independent of the main controller or the pitch controller.

[0103] The shutdown control method of the present disclosure adjusts the control strategy to reduce the impact on the pitch motor, the pitch driver, etc. when the wind turbine generator system fails to pitch.

[0104] The shutdown control method of the present disclosure can reduce the vibration of the wind turbine generator set, reduce the mechanical fatigue load of the wind turbine generator set, prolong the mechanical life of the wind turbine generator set, and reduce the vibration and motor current caused by the speed mutation to the variable pitch motor.

[0105] The shutdown control method of the present disclosure can be directly matched with the control strategy of first yaw and then pitch, further reducing the load of the wind turbine generator set.

[0106] The shutdown control method of the present disclosure can reduce the cost and is easy to implement, only needs to modify the software control strategy, and can be completed by the pitch controller or the main control controller alone or jointly.

[0107] Although some exemplary embodiments of the present disclosure have been shown and described, those skilled in the art should understand that modifications and improvements can be made to these embodiments without departing from the principles and spirits of the present disclosure, for example, the technical features of different embodiments can be combined. These modifications and improvements are within the scope of the present disclosure.

Claims

1. A method for controlling the shutdown of a wind turbine generator set, characterized in that, include: In response to a wind turbine generator set triggering a shutdown fault, determine whether the pitch system is in a pitch-opening operation state; In response to the pitch system being in open-pitch operation, the control system stops the pitch motor and then executes the retraction speed to drive the blades to retract to a safe position. In response to a shutdown fault triggered by a wind turbine generator set, the shutdown control method further includes setting the fault trigger flag to 1. In response to the pitch system being in open-pitch operation, the steps to stop the pitch motor include: In response to the pitch system being in open-pitch operation and the fault trigger flag being set to 1, a pitch speed of 0 is sent to the pitch motor to control the pitch motor to execute a stop strategy at the pitch speed of 0 for a first preset time. The steps for controlling the pitch motor to stop and then execute the pitch recovery speed include: In response to a fault trigger flag being constantly set to 1 for a second preset time, a retraction speed is sent to the pitch motor to drive the blades to retract to a safe position, wherein the second preset time is greater than the first preset time. In response to the fault trigger flag being reset within a second preset time, a normal pitch control command is sent to the pitch motor to drive the blades to adjust the pitch normally.

2. The shutdown control method for wind turbine generator sets according to claim 1, characterized in that, Also includes: In response to the pitch system being in a non-opening operation state, the pitch motor is controlled to directly execute the retraction speed to drive the blades to retract to a safe position.

3. The shutdown control method for wind turbine generator sets according to claim 1, characterized in that, The steps to determine whether the pitch system is in open-pitch operation include: Determine whether the speed of the pitch motor is 0; In response to the pitch motor's rotational speed being non-zero, determine whether the pitch speed is negative; In response to the pitch speed being negative, it is determined that the pitch system is in a pitch-opening operation state.

4. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it causes the processor to perform the shutdown control method for the wind turbine generator as described in any one of claims 1 to 3.

5. A shutdown control device for a wind turbine generator set, characterized in that, The shutdown control equipment includes: processor; and Memory, which stores computer programs When the computer program is executed by the processor, it causes the processor to execute the shutdown control method for the wind turbine generator as described in any one of claims 1 to 3.

6. A wind turbine generator set, characterized in that, The wind turbine generator set includes the shutdown control device as described in claim 5.

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