Wind turbine positioning method and wind turbine

Abstract

The application discloses a wind wheel positioning method of a wind generating set and the wind generating set. The wind wheel positioning method of the wind generating set comprises the following steps: short-circuiting windings of a generator so as to change the generator into a motor; calculating a given current of the motor according to an angle difference between a target angle of the wind wheel and a current angle of the wind wheel; and supplying power to the motor according to the given current so as to drive the wind wheel to rotate to the target angle by the motor and fix the wind wheel. The wind wheel can be fixed in the case of no wind or small wind without waiting for wind to blow the wind wheel or manually pulling the wind wheel by virtue of the fact that the windings of the generator of the wind generating set are short-circuited and then the wind wheel is driven to rotate by the given current. The number of workers is reduced, the waste of manpower and material resources is reduced, and the fixing efficiency of the wind wheel is improved by virtue of the fact that the wind wheel is driven by the motor.

Description

Technical Field

[0001] This invention relates to the field of wind power generation equipment technology, and in particular to a wind turbine rotor positioning method and a wind turbine generator set. Background Technology

[0002] The pitch system of a wind turbine is a key component to ensure the efficient operation of the turbine under different wind speed conditions. The pitch system typically includes components such as the rotor, pitch drive system, and sensors. Wind turbines usually operate in harsh natural environments and are exposed to different weather conditions. The blades on the rotor and related structures may be eroded and damaged by natural factors such as wind, rain, snow, and ice, leading to wear and fatigue. Therefore, in order to prevent damage to the pitch system, it is necessary to maintain the pitch system frequently.

[0003] When maintaining a pitch system, it is usually necessary to fix the wind turbine at an angle before maintenance is performed by staff. In existing technology, the wind turbine is usually stopped by staff who lock the locking structure with the matching structure on the wind turbine when the wind blows it to a fixed position. However, due to the time difference between multiple staff members, it is usually necessary to wait repeatedly for the wind turbine to rotate to a fixed position before it can be fixed. In the case of light wind or no wind, the wind turbine may even need to be dragged manually, which wastes a lot of manpower and results in low efficiency in fixing the wind turbine. Summary of the Invention

[0004] The main objective of this invention is to provide a method for positioning the wind turbine rotor of a wind turbine generator set and a wind turbine generator set, aiming to solve the problem of low efficiency in fixing the wind turbine rotor in existing wind turbine generator sets.

[0005] To achieve the above objectives, the present invention provides a method for positioning the wind turbine rotor of a wind turbine generator set, comprising the following steps:

[0006] Short-circuit the windings of the generator to convert the generator into an electric motor;

[0007] The given current of the motor is calculated based on the angle difference between the target angle of the wind turbine and the current angle of the wind turbine.

[0008] Power is supplied to the motor according to the given current so that the motor drives the wind turbine to rotate to the target angle and fix the wind turbine.

[0009] Preferably, the formula for calculating the given current is:

[0010]

[0011] Where k1, k2, and k3 are PID parameters, and are respectively the proportional constant, integral coefficient, and derivative coefficient, Δθ(t) is the angle difference, I is the given current, and t is time.

[0012] Preferably, the step of supplying power to the motor according to the given current to drive the wind turbine to rotate to the target angle, and fixing the wind turbine includes:

[0013] Power is supplied to the wind turbine according to the given current, and the given current is gradually adjusted during the rotation of the wind turbine;

[0014] When the wind turbine rotates to the target angle, the wind turbine is braked;

[0015] Detect the current angle of the wind turbine and compare it with the target angle;

[0016] If the angle difference between the current angle of the wind turbine and the target angle is within a preset difference range, then the wind turbine is fixed.

[0017] If the angle difference between the current angle of the wind turbine and the target angle is outside the preset difference range, then return to the step of calculating the given current of the motor based on the angle difference between the target angle of the wind turbine and the current angle of the wind turbine, until the angle difference between the current angle of the wind turbine and the target angle is within the preset difference range.

[0018] Preferably, the step of gradually adjusting the given current during the rotation of the wind turbine includes:

[0019] The angle difference between the current angle and the target angle during the rotation of the wind turbine is calculated in real time.

[0020] Based on the angle difference between the current angle and the target angle of the wind turbine, the PID parameters are adjusted in real time using a PID algorithm to adjust the magnitude of the given current.

[0021] Preferably, the step of fixing the wind turbine includes:

[0022] The wind turbine locking pin is pushed out and engaged with the pin hole on the wind turbine to fix the wind turbine.

[0023] To achieve the above objectives, the present invention also provides a wind turbine generator set and a wind turbine rotor positioning method applied to the above-mentioned wind turbine generator set. The wind turbine generator set includes a housing, a generator, a wind turbine rotor, an angle sensor, a brake, a gearbox, and a controller. The generator is located inside the housing. The wind turbine rotor is mounted on the housing and connected to the input shaft of the gearbox. The output shaft of the gearbox is connected to the rotor of the generator. The wind turbine rotor is used to drive the rotor of the generator to rotate through the gearbox. The angle sensor is mounted on the input shaft or the wind turbine rotor and is used to detect the current angle of the wind turbine rotor. The brake is mounted on the output shaft of the gearbox and is used to brake the wind turbine rotor. The angle sensor, the generator, and the brake are all electrically connected to the controller.

[0024] Preferably, the angle sensor is an absolute encoder.

[0025] Preferably, the impeller is provided with a pin hole, and a locking pin is movably installed on the housing. The locking pin is used to insert into the pin hole to fix the impeller.

[0026] Preferably, a driving component is provided on the housing, and the locking pin is mounted on the output shaft of the driving component. The driving component is used to drive the locking pin to move toward or away from the wind turbine.

[0027] Preferably, the driving component is a hydraulic driving component.

[0028] In the technical solution of this invention, the windings of the generator in the wind turbine are short-circuited, forming a current loop. The magnetic field generated by this current in the windings interacts with the magnetic field on the generator rotor, causing the rotor to rotate. This rotor then drives the wind turbine to rotate. Based on the target angle of the wind turbine and the given current of the wind turbine motor, power is supplied to the motor according to the given current. This prevents the wind turbine from rotating too quickly, which would cause it to stop beyond its fixed position and be impossible for workers to fix. The wind turbine rotates slowly, and then is braked when it reaches the target angle. At this point, the wind turbine is in a fixed position, facilitating maintenance and fixation. This invention, by short-circuiting the generator windings and driving the wind turbine with a given current, eliminates the need to wait for wind to blow the turbine or manually pull it. It can fix the wind turbine even in windless or lightly windy conditions, and timely braking prevents the turbine from rotating past its fixed position due to time differences between multiple workers. Furthermore, driving the turbine with a motor reduces the number of workers required, minimizing waste of manpower and resources and improving the efficiency of turbine fixation. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 This is a flowchart of a wind turbine rotor positioning method according to an embodiment of the present invention.

[0031] Figure 2 This is a detailed flowchart of step S300 of a wind turbine rotor positioning method according to an embodiment of the present invention.

[0032] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indicator will also change accordingly.

[0035] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible to those skilled in the art. If a combination of technical solutions contradicts each other or cannot be implemented, such a combination should be considered non-existent and not within the scope of protection claimed by the present invention. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0038] This invention proposes a method for positioning the wind turbine rotor of a wind turbine generator set.

[0039] Please see Figure 1 The wind turbine rotor positioning method of this embodiment includes the following steps: The wind turbine generator set includes a wind turbine rotor and a generator.

[0040] S100: Short-circuit the windings of the generator to convert the generator into an electric motor;

[0041] The principles of generators and motors are similar, both based on the working principle of electromagnetic induction. Therefore, by manually connecting the wires in the event of a power outage, or by using existing technologies such as electric switching to achieve line switching, the windings of the wind turbine can be short-circuited, and then current can be input into the windings to form a magnetic field. This magnetic field interacts with the magnetic field of the generator rotor to generate an electromagnetic torque, thereby causing the generator rotor to start rotating.

[0042] S200: Calculate the given current of the motor based on the angle difference between the target angle of the wind turbine and the current angle of the wind turbine;

[0043] The angle of the wind turbine is 0° when one of its blades is pointing vertically downwards. The position of the pin hole on the wind turbine corresponding to the locking pin is the target angle. The magnitude of the given current is calculated based on the angle difference between the target angle and the current angle.

[0044] S300: Power the motor according to the given current to drive the wind turbine to rotate to the target angle and fix the wind turbine.

[0045] In the technical solution of this invention, the windings of the wind turbine generator are short-circuited. By short-circuiting the generator windings, a current loop is formed. The magnetic field generated by this current in the windings interacts with the magnetic field on the generator rotor, causing the rotor to start rotating. This rotor then drives the wind turbine to rotate. Based on the target angle of the wind turbine and the given current of the wind turbine motor, power is supplied to the motor according to the given current. This prevents the wind turbine from rotating too quickly and exceeding the fixed position when it stops, making it impossible for workers to fix the wind turbine. The wind turbine rotates slowly, and then is braked when it reaches the target angle. At this point, the wind turbine is in a fixed position, facilitating maintenance and fixation. This invention, by short-circuiting the wind turbine generator windings and driving the wind turbine to rotate with a given current, eliminates the need to wait for wind to blow the wind turbine or manually pull it. It can fix the wind turbine even in windless or lightly windy conditions, and timely braking prevents the wind turbine from rotating past the fixed position due to time differences between multiple workers. Driving the wind turbine with a motor also reduces the number of workers required, minimizing waste of manpower and resources and improving the efficiency of wind turbine fixation.

[0046] Specifically, the formula for calculating the given current is:

[0047]

[0048] Where k1, k2, and k3 are PID parameters, and are respectively the proportional constant, integral coefficient, and derivative coefficient, Δθ(t) is the angle difference, I is the given current, and t is time.

[0049] The magnitude of the given current is calculated based on the above formula, ensuring that the rotation speed of the wind turbine is neither too fast nor too slow. This allows the operator to fix the wind turbine in time when it reaches the target angle, thus improving the fixing efficiency of the wind turbine.

[0050] Please see Figure 2 In one embodiment, step S300 includes:

[0051] S310: Power the wind turbine according to the given current, and gradually adjust the given current during the rotation of the wind turbine;

[0052] As the wind turbine approaches the preset angle, the given current is gradually reduced to slow down the wind turbine and prevent it from rotating past the fixed position.

[0053] S320: When the wind turbine rotates to the target angle, brake the wind turbine;

[0054] When the wind turbine rotates to a preset angle, the wind turbine is braked by a high-speed brake, so that the wind turbine stops in a fixed position;

[0055] S330: Detect the current angle of the wind turbine and compare it with the target angle;

[0056] Detect the current angle of the wind turbine after it stops and compare it with the target angle;

[0057] S340: If the angle difference between the current angle of the wind turbine and the target angle is within a preset difference range, then the wind turbine is fixed;

[0058] S350: If the angle difference between the current angle of the wind turbine and the target angle is outside the preset difference range, then return to step S200 until the angle difference between the current angle of the wind turbine and the target angle is within the preset difference range.

[0059] Understandably, even if the brake applies pressure to the wind turbine, the turbine will continue to rotate a certain distance due to inertia. Therefore, the angle difference between the current angle of the wind turbine and the target angle is detected. If the difference is within the preset range, the locking pin and the pin hole on the wind turbine can be engaged and fixed, and the rotation is completed, thus fixing the wind turbine. If the difference is outside the preset range, the locking pin and the pin hole on the wind turbine cannot be engaged and fixed, and the process needs to return to the step of calculating the given current until the difference is within the preset range.

[0060] Further, step S310 includes:

[0061] S3101: Calculate the angle difference between the current angle and the target angle during the rotation of the wind turbine in real time;

[0062] S3102: Based on the angle difference between the current angle and the target angle of the wind turbine, the PID parameters are adjusted in real time using a PID algorithm to adjust the magnitude of the given current.

[0063] Specifically, the step of fixing the wind turbine includes:

[0064] The wind turbine locking pin is pushed out and engaged with the pin hole on the wind turbine to fix the wind turbine.

[0065] The wind turbine is secured by using a hydraulic system to push out the locking pin and engage it with the pin hole on the wind turbine, or by manually engaging the locking pin with the pin hole to fix the wind turbine and prevent it from rotating during maintenance.

[0066] To achieve the above objectives, the present invention also provides a wind turbine generator set and a wind turbine rotor positioning method applied to the above-mentioned wind turbine generator set. The wind turbine generator set includes a housing, a generator, a wind turbine rotor, an angle sensor, a brake, a gearbox, and a controller. The generator is located inside the housing, the wind turbine rotor is mounted on the housing and connected to the input shaft of the gearbox, the output shaft of the gearbox is connected to the rotor of the engine, the wind turbine rotor is used to drive the rotor of the generator to rotate through the gearbox, the angle sensor is mounted on the input shaft or the wind turbine rotor and is used to detect the current angle of the wind turbine rotor, the brake is mounted on the output shaft of the gearbox and is used to brake the wind turbine rotor, and the angle sensor, generator, and brake are all electrically connected to the controller.

[0067] In the technical solution of this invention, the rotor of the wind turbine and the engine body are connected by an input shaft. The wind turbine is driven by the wind to rotate the input shaft. After the input shaft is driven in the gearbox, it drives the output shaft to rotate, which in turn drives the rotor to rotate. The rotor can also drive the wind turbine to rotate. An angle sensor is set on the wind turbine or the input shaft to detect the current angle of the wind turbine. The installation position of the angle sensor is selected according to the actual situation to improve its applicability. The controller uses the brake to brake the wind turbine based on the current angle detected by the angle sensor. When the wind turbine needs maintenance, the winding of the generator is short-circuited, so that the generator becomes a motor. Then, the target angle of the wind turbine and the given current of the wind turbine are used to calculate the given current of the motor. Power is supplied to the motor according to the given current. The generator drives the output shaft to rotate, and after being driven by the gearbox, it drives the input shaft to rotate, which in turn drives the wind turbine to rotate slowly. Then, when the wind turbine reaches the target angle, the wind turbine is braked. At this time, the wind turbine is in a fixed position, which is convenient for the staff to fix and maintain the wind turbine. This invention short-circuites the generator windings and then drives the wind turbine to rotate with a given current. It eliminates the need to wait for wind to blow the wind turbine or manually pull it. It can fix the wind turbine even in the absence of wind or with light wind. At the same time, it can brake the wind turbine in time to prevent the wind turbine from rotating past the fixed position due to the time difference of multiple workers. The motor-driven wind turbine also reduces the number of workers, reduces the waste of manpower and material resources, and improves the fixing efficiency of the wind turbine.

[0068] In one embodiment, the angle sensor is further defined as an absolute encoder. An absolute encoder can provide accurate position information at any given time, improving the accuracy of the detection results.

[0069] In one embodiment, the wind turbine is provided with a pin hole, and a locking pin is movably mounted on the housing. The locking pin is used to insert into the pin hole to fix the wind turbine. The wind turbine is fixed by the cooperation of the locking pin and the pin hole, preventing the wind turbine from rotating during maintenance and improving safety.

[0070] Furthermore, a driving component is provided on the housing, and the locking pin is mounted on the output shaft of the driving component. The driving component is used to drive the locking pin to move toward or away from the wind turbine. By setting the driving component to drive the locking pin to move toward or away from the wind turbine to cooperate with the pin hole, the wind turbine is fixed. When the angle difference between the current angle and the target angle of the wind turbine is within a preset interpolation range, the controller controls the driving component to push out the locking pin and cooperate with the pin hole to fix the wind turbine. No manual operation is required, which can save manpower, improve fixing efficiency, and drive accuracy.

[0071] Specifically, the driving component is a hydraulic drive component. Hydraulic drive components have a large thrust, which can provide higher inference output within the same volume. At the same time, the structure is simple and stable, easy to maintain and replace, and the control of hydraulic drive components is simple, making it easy to control the hydraulic drive components to perform operations through a controller.

[0072] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for positioning the rotor of a wind turbine generator set, wherein, The wind turbine generator set includes a wind rotor and a generator, characterized in that the wind rotor positioning method of the wind turbine generator set includes the following steps: Short-circuit the windings of the generator to convert the generator into an electric motor; The given current of the motor is calculated based on the angle difference between the target angle of the wind turbine and the current angle of the wind turbine. Power is supplied to the motor according to the given current so that the motor drives the wind turbine to rotate to the target angle and fix the wind turbine. The formula for calculating the given current is: in, , and These are all PID parameters, specifically the proportional constant, integral coefficient, and derivative coefficient. Let I be the angle difference, I be the given current, and t be time; The step of supplying power to the motor according to the given current, so as to drive the wind turbine to rotate to the target angle by the motor, and fixing the wind turbine includes: Power is supplied to the wind turbine according to the given current, and the given current is gradually adjusted during the rotation of the wind turbine; When the wind turbine rotates to the target angle, the wind turbine is braked; Detect the current angle of the wind turbine and compare it with the target angle; If the angle difference between the current angle of the wind turbine and the target angle is within a preset difference range, then the wind turbine is fixed. If the angle difference between the current angle of the wind turbine and the target angle is outside the preset difference range, then return to the step of calculating the given current of the motor based on the angle difference between the target angle of the wind turbine and the current angle of the wind turbine, until the angle difference between the current angle of the wind turbine and the target angle is within the preset difference range.

2. The wind turbine rotor positioning method of a wind turbine generator set as described in claim 1, characterized in that, The step of gradually adjusting the given current during the rotation of the wind turbine includes: The angle difference between the current angle and the target angle during the rotation of the wind turbine is calculated in real time. Based on the angle difference between the current angle and the target angle of the wind turbine, the PID parameters are adjusted in real time using a PID algorithm to adjust the magnitude of the given current.

3. The wind turbine rotor positioning method of a wind turbine generator set as described in claim 1, characterized in that, The step of fixing the wind turbine includes: The wind turbine locking pin is pushed out and engaged with the pin hole on the wind turbine to fix the wind turbine.

4. A wind turbine generator set, applied to the rotor positioning method of the wind turbine generator set as described in any one of claims 1-3, characterized in that, The wind turbine generator set includes a housing, a generator, a wind turbine, an angle sensor, a brake, a gearbox, and a controller. The generator is located inside the housing. The wind turbine is mounted on the housing and connected to the input shaft of the gearbox. The output shaft of the gearbox is connected to the rotor of the generator. The wind turbine is used to drive the rotor of the generator to rotate through the gearbox. The angle sensor is mounted on the input shaft or the wind turbine and is used to detect the current angle of the wind turbine. The brake is mounted on the output shaft of the gearbox and is used to brake the wind turbine. The angle sensor, the generator, and the brake are all electrically connected to the controller.

5. The wind turbine generator set as described in claim 4, characterized in that, The angle sensor is an absolute encoder.

6. The wind turbine generator set as described in claim 4, characterized in that, The wind turbine is provided with a pin hole, and a locking pin is movably installed on the housing. The locking pin is used to insert into the pin hole to fix the wind turbine.

7. The wind turbine generator set as described in claim 6, characterized in that, A drive unit is provided on the housing, and the locking pin is mounted on the output shaft of the drive unit. The drive unit is used to drive the locking pin to move toward or away from the wind turbine.

8. The wind turbine generator set as described in claim 7, characterized in that, The driving component is a hydraulic driving component.

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