Variable pitch system of wind turbine generator and control method and device thereof

Abstract

The application discloses a variable pitch system of a wind turbine generator set and a control method and device thereof, and belongs to the technical field of wind power generation. The system comprises: a variable pitch bearing connected with a blade of the wind turbine generator set, the variable pitch bearing being used for rotating between N preset working positions; the pitch angle of the blade is different at different preset working positions; a rotating position detection device is used for detecting a first preset working position of the variable pitch bearing in the N preset working positions; and a control device is connected with the variable pitch bearing and the rotating position detection device, and is used for controlling the variable pitch bearing to discontinuously rotate M times to switch the variable pitch bearing from the first preset working position to a second preset working position under the condition that the wind turbine generator set is in a full-power generation state and the power of the wind turbine generator set changes, and under the second preset working position, the rotating speed of the blade can be adjusted to a rated rotating speed.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, specifically to a pitch control system for a wind turbine generator set and its control method and device. Background Technology

[0002] With the development of wind power technology, wind turbine generators are being used more and more widely to convert wind energy into the electrical energy needed by people. Pitch control, as one of the main methods for controlling power during wind turbine generator operation, involves adjusting the pitch angle of the turbine blades after the generator has reached full power output to maintain a stable power output. In adjusting the pitch angle, the pitch bearing connected to the blade root is typically driven by a pitch drive device to rotate, thus changing the blade pitch angle. However, currently, the pitch bearing is prone to fatigue damage during pitch angle adjustment, leading to reduced operational stability of the wind turbine generator. Summary of the Invention

[0003] The purpose of this application is to provide a pitch system and control method / device for a wind turbine generator set, which can reduce the possibility of fatigue damage to the pitch bearing during the adjustment of the blade pitch angle of the wind turbine, thereby improving the operational stability of the wind turbine generator set.

[0004] In a first aspect, embodiments of this application provide a pitch control system for a wind turbine generator set, comprising:

[0005] A pitch bearing is connected to the blades of the wind turbine generator set. The pitch bearing is used to rotate between N preset working positions. The pitch angle of the blades is different in different preset working positions, where N is an integer greater than 1.

[0006] A rotational position detection device is used to detect the first preset working position of the pitch bearing among the N preset working positions;

[0007] A control device, connected to the pitch bearing and the rotational position detection device, and the control device is used for:

[0008] When the wind turbine generator is in full-power power generation mode and the power of the wind turbine generator changes, the pitch bearing is controlled to rotate M times discontinuously, so that the pitch bearing switches from the first preset working position to the second preset working position. In the second preset working position, the speed of the blade can be adjusted to the rated speed, and M is a positive integer.

[0009] Secondly, embodiments of this application provide a wind turbine generator set, including the pitch system described in the first aspect.

[0010] Thirdly, embodiments of this application provide a control method for a pitch system of a wind turbine generator set, including:

[0011] When the power of the wind turbine generator set is greater than or equal to a first preset power threshold and the pitch bearing of the pitch system is in a first preset working position, the power of the wind turbine generator set is monitored. The pitch bearing can rotate between N preset working positions, and the blade pitch angle is different in different preset working positions. N is an integer greater than 1.

[0012] When the wind turbine generator is detected to be generating power at full capacity, the pitch bearing is controlled to rotate M times discontinuously, so that the pitch bearing switches from the first preset working position to the second preset working position. In the second preset working position, the speed of the blade can be adjusted to the rated speed, and M is a positive integer.

[0013] Fourthly, embodiments of this application provide a control device for the pitch system of a wind turbine generator set, comprising:

[0014] The monitoring module is used to monitor the power of the wind turbine generator set when the power of the wind turbine generator set is greater than or equal to a first preset power threshold and the pitch bearing of the pitch system is in a first preset working position. The pitch bearing can rotate between N preset working positions, and the blade pitch angle is different in different preset working positions, where N is an integer greater than 1.

[0015] The first control module is used to control the pitch bearing to rotate M times discontinuously when the wind turbine generator is detected to be in full power generation state, so that the pitch bearing switches from the first preset working position to the second preset working position. In the second preset working position, the speed of the blade can be adjusted to the rated speed, and M is a positive integer.

[0016] Fifthly, embodiments of this application provide a readable storage medium on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method described in the third aspect.

[0017] In this embodiment, when the wind turbine is operating at full power and its power output changes, the control device of the pitch system can control the pitch bearing to rotate discontinuously M times. This causes the pitch bearing to rotate from a first preset operating position to a second preset operating position where the blade speed can be adjusted to the rated speed. By controlling the pitch bearing to rotate between N preset operating positions, the frequency of its rotation can be reduced during the adjustment of the wind turbine blade pitch angle, thereby reducing the likelihood of fatigue damage and improving the operational stability of the wind turbine. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the pitch system of the wind turbine generator provided in this application;

[0019] Figure 2 This is a schematic diagram of a portion of the structure in an embodiment of the pitch system of the wind turbine generator provided in this application;

[0020] Figure 3 This is a flowchart illustrating an embodiment of the control method for the pitch system of a wind turbine generator provided in this application;

[0021] Figure 4 This is a schematic diagram of an embodiment of the control device for the pitch system of the wind turbine generator provided in this application. Detailed Implementation

[0022] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0023] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0024] The control method of the pitch system of the wind turbine generator provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0025] Please see Figure 1 This is a structural schematic diagram of an embodiment of the pitch system of the wind turbine generator provided in this application. Figure 1 As shown, the pitch system of this wind turbine generator includes:

[0026] A pitch bearing 10 is connected to the blades of the wind turbine generator set. The pitch bearing 10 is used to rotate between N preset working positions. The pitch angle of the blades is different in different preset working positions, where N is an integer greater than 1.

[0027] Rotational position detection device 20 is used to detect the first preset working position of the pitch bearing 10 among the N preset working positions;

[0028] A control device 30 is connected to the pitch bearing 10 and the rotational position detection device 20, and the control device 30 is used for:

[0029] When the wind turbine generator is in full-power power generation mode and the power of the wind turbine generator changes, the pitch bearing 10 is controlled to rotate M times discontinuously, so that the pitch bearing 10 switches from the first preset working position to the second preset working position. In the second preset working position, the speed of the blade can be adjusted to the rated speed, and M is a positive integer.

[0030] Based on this, when the wind turbine generator is operating at full power and its power output changes, the control device 30 of the pitch system can control the pitch bearing 10 to rotate discontinuously M times. This allows the pitch bearing 10 to rotate from the first preset operating position to a second preset operating position where the blade speed can be adjusted to the rated speed. In this way, by controlling the pitch bearing 10 to rotate between N preset operating positions, the frequency of rotation of the pitch bearing 10 can be reduced during the adjustment of the wind turbine blade pitch angle. This reduces the possibility of fatigue damage to the pitch bearing 10 and improves the operational stability of the wind turbine generator.

[0031] In this embodiment of the application, the pitch system of the wind turbine generator set includes a pitch bearing 10, which is connected to the blades of the wind turbine generator set. The pitch bearing 10 can rotate, and when the pitch bearing 10 rotates, it drives the blades to move and causes the blade pitch angle to change.

[0032] See also Figure 2The pitch bearing 10 is connected to the blade in two ways: the blade root is connected to the outer ring r2 of the pitch bearing 10, and the hub of the wind turbine is connected to the inner ring r1 of the pitch bearing 10. The outer ring r2 of the pitch bearing 10 rotates relative to the hub to adjust the blade pitch angle, i.e., the pitch method can be adjusted by adjusting the outer ring. Alternatively, the blade root is connected to the inner ring r1 of the pitch bearing 10, and the hub of the wind turbine is connected to the outer ring r2 of the pitch bearing 10. The inner ring r1 of the pitch bearing 10 rotates relative to the hub to adjust the blade pitch angle, i.e., the pitch method can be adjusted by adjusting the inner ring.

[0033] It should be noted that the above-mentioned pitch system may have N preset working positions. Under different preset working positions, the blade pitch angle is different, and the above-mentioned pitch bearing 10 can rotate between the N preset working positions.

[0034] Of course, the aforementioned pitch bearing 10 rotates between the N preset working positions. The pitch system may be equipped with an indicator component for indicating the rotation position of the pitch bearing 10 (for example, a protrusion on the outer or inner ring of the pitch bearing 10 during rotation). When the wind turbine generator is in a shutdown state, the indicator component indicates the preset shutdown position of the pitch system; and when the pitch bearing 10 rotates between the N preset working positions, the indicator component indicates the current preset working position of the pitch bearing 10.

[0035] Furthermore, the number (i.e., N) of the aforementioned preset working positions and their positions can be set according to actual needs. Since the aforementioned pitch bearing 10 moves in a rotating manner, the aforementioned N preset working positions can be arranged around the aforementioned pitch bearing 10, and the spacing between any two adjacent preset working positions among the N preset working positions can be equal or unequal, which is not limited here.

[0036] In this embodiment of the application, the pitch system further includes a rotational position detection device 20, which is used to detect the first preset working position of the pitch bearing 10 among N preset working positions.

[0037] The aforementioned rotational position detection device 20 can be any device capable of detecting the first preset working position of the pitch bearing 10 among N preset working positions. For example, the aforementioned rotational position detection device 20 may include an image recognition device, which can capture images of the pitch bearing 10 and the N preset working positions using its camera when the pitch bearing 10 completes rotation, and identify the first preset working position indicated by the aforementioned indicating component based on the images, and so on.

[0038] Alternatively, the rotational position detection device may include a sensor mounted on a rotating shaft connected to the pitch bearing. The rotational position detection device can calculate the first preset working position of the pitch bearing 10 based on the rotation angle of the rotating shaft, thereby making the structure simple and easy to implement.

[0039] It should be noted that the aforementioned sensor is mounted on the rotating shaft connected to the pitch bearing. This could mean that the sensor is mounted on the output shaft of the pitch motor, or on the output shaft of the reducer, etc.

[0040] In some embodiments, the rotational position detection device 20 described above may include a first sensor and N second sensors:

[0041] The first sensor is connected to the inner ring of the pitch bearing 10 or the outer ring of the pitch bearing;

[0042] The N second sensors are arranged sequentially at intervals around the outer ring of the pitch bearing 10, and the first sensor rotates under the drive of the pitch bearing 10 and works in cooperation with each of the second sensors. When the first sensor works in cooperation with different second sensors, the pitch bearing 10 is in different preset working positions.

[0043] Based on this, by setting a first sensor and N second sensors, the rotation position detection device 20 can determine the preset working position corresponding to the second sensor that works in cooperation with the first sensor as the first preset working position according to the cooperation between the first sensor and the second sensor. This makes the structure of the rotation position detection device 20 simple and highly reliable.

[0044] It should be noted that the first sensor mentioned above can determine that the pitch bearing 10 is in a preset working position corresponding to the second sensor when working in conjunction with any of the N second sensors mentioned above.

[0045] The N second sensors are arranged sequentially and at intervals around the outer ring of the pitch bearing 10. This can be achieved by having the N preset working positions arranged sequentially and at intervals around the outer ring of the pitch bearing 10, with the N second sensors respectively located at the N preset working positions and different second sensors located at different preset working positions.

[0046] For example, the first sensor can be a light emitter, and the N second sensors can be N light receivers arranged at intervals around the outer ring of the pitch bearing 10. The pitch bearing 10 has a through hole facing the light emitter so that the infrared light emitted by the light emitter can pass through the through hole. When the pitch bearing 10 rotates, if any of the N light receivers receives the infrared light emitted by the light emitter, the preset working position of the light receiver is the first preset working position.

[0047] In some embodiments, the rotational position detection device 20 may further include:

[0048] The third sensor is disposed around the outer ring of the pitch bearing 10, and the position of the third sensor is different from the positions of the N second sensors, wherein:

[0049] When the first sensor rotates to cooperate with the third sensor, the pitch bearing 10 is in a preset stop position.

[0050] Based on this, by setting the aforementioned third sensor, it is possible to determine that the pitch bearing 10 is in a preset shutdown position when the first sensor and the third sensor work together, thereby enabling precise control of the pitch bearing 10 when the wind turbine generator is shut down.

[0051] The third sensor is located around the outer ring of the pitch bearing 10. It can be arranged at intervals around the outer ring of the pitch bearing 10 with a preset stop position and N preset working positions, and the third sensor is located at the preset stop position.

[0052] In addition, when the first sensor rotates to cooperate with the third sensor, it can be determined that the pitch bearing 10 is in the aforementioned preset stop position.

[0053] For example, when the first sensor is the emitter and the N preset working positions are equipped with the N receivers, a receiver may also be provided at the preset shutdown position. When the receiver at the preset shutdown position receives the infrared light emitted by the emitter, the wind turbine of the wind turbine generator set is in a shutdown state.

[0054] Furthermore, when the wind turbine generator switches from a stopped state to an operating state, the wind turbine first drives the blades to rotate via the turbine drive device to achieve self-starting. During the self-starting process, the aforementioned pitch bearing 10 can rotate from a preset stop position to adjust the blades from the retracted state to the open state, until the pitch angle of the adjusted blades is at the start-up angle. At this start-up angle, the turbine drive device stops, thus achieving self-starting of the wind turbine.

[0055] It should be noted that during the process of adjusting the blade pitch angle to the start-up angle, the pitch system can control the pitch bearing 10 to rotate multiple times according to the power output of the wind turbine generator set or the speed of the wind turbine, etc., according to a preset rotation range. That is, after each rotation of the pitch bearing 10, it is determined whether the wind turbine has reached the self-starting condition according to the power output of the wind turbine generator set or the speed of the wind turbine. If it has not been met, the pitch bearing 10 is controlled to rotate again according to the preset rotation range until it is determined that the wind turbine has reached the self-starting condition, and the wind turbine drive device is controlled to stop. At this time, the blade pitch angle is the aforementioned start-up angle.

[0056] Alternatively, based on historical startup data, a preset startup position can be pre-set in the pitch system. When the turbine drive unit drives the blades to rotate, the pitch bearing 10 can directly rotate to the preset startup position. At the preset startup position, the turbine can meet the above-mentioned self-starting conditions, and the turbine drive unit will stop.

[0057] In some embodiments, the rotational position detection device 20 may further include:

[0058] The fourth sensor is disposed around the outer ring of the pitch bearing 10, and its position is located between the N second sensors and the third sensor, wherein:

[0059] When the first sensor rotates to cooperate with the fourth sensor, the pitch bearing 10 is in a preset start-up position.

[0060] Based on this, by setting the aforementioned fourth sensor, the pitch bearing 10 can be controlled to rotate during the self-starting process of the wind turbine generator set, so that the first sensor and the fourth sensor work together to achieve the pitch bearing 10 in the preset start-up position. This can further reduce the number of times the pitch bearing 10 rotates, thereby reducing the possibility of fatigue damage to the pitch bearing 10 and improving control accuracy.

[0061] In this embodiment of the application, the pitch system further includes a control device 30, which can be connected to the pitch bearing 10 and the rotation position detection device 20. The control device 30 can control the pitch bearing 10 to rotate according to the detection result of the rotation position detection device 20.

[0062] The control device 30 controls the pitch bearing 10 to rotate. The control device 30 may include a controller and a bearing drive assembly. The controller is connected to the rotation position detection device 20 and the bearing drive assembly. The bearing drive assembly is connected to the pitch bearing 10. The controller controls the bearing drive assembly to drive the pitch bearing 10 to rotate according to the detection result of the rotation position detection device 20.

[0063] It should be noted that the connection between the control device 30 and the pitch bearing 10 and the rotation position detection device 20 can be at least one of mechanical connection and electrical connection, and is not limited here.

[0064] In this embodiment of the application, the control device 30 controls the pitch bearing 10 to rotate according to the detection result of the rotation position detection device 20. This can be achieved when the wind turbine generator is in full power generation and the power of the wind turbine generator changes. The control device 30 controls the pitch bearing 10 to rotate M times discontinuously, so that the pitch bearing 10 switches from the first preset working position to the second preset working position. In the second preset working position, the rotational speed of the blade can be adjusted to the rated speed.

[0065] Wherein, the first preset working position is the current preset working position among the N preset working positions, and the second preset working position can be any preset working position other than the first preset working position among the N preset working positions. In the circumferential direction of the pitch bearing 10, the second preset working position can be adjacent to the first preset working position, or the second preset working position can be spaced apart from the first preset working position by at least one preset working position.

[0066] It should be noted that the above-mentioned wind turbine generators are in full-power power generation mode, and the power of the wind turbine generators changes. This can be when the power of the wind turbine generators at the current moment is greater than or equal to the rated power, and the power of the wind turbine generators at the current moment increases or decreases.

[0067] In addition, the control device 30 controls the pitch bearing 10 to rotate discontinuously M times so that the pitch bearing 10 switches from the first preset working position to the second preset working position. Alternatively, the control device 30 may determine the second preset working position according to a preset rule and control the pitch bearing 10 to rotate M times from the first preset working position to the second preset working position.

[0068] For example, the control device 30 can determine the number of rotations of the pitch bearing 10 based on the ratio of the change in the power of the wind turbine generator set to the rated power. The number of rotations can be i, so that the pitch bearing 10 can rotate from the j-th preset working position to the j±i-th preset working position. The larger the ratio, the larger i is, and vice versa; i and j can both be positive integers.

[0069] In some embodiments, the control device 30 described above is specifically used for:

[0070] When the wind turbine generator is detected to be generating power at full capacity, the change in the power of the wind turbine generator is obtained, and the change is used to indicate whether the power of the wind turbine generator increases or decreases.

[0071] Control the pitch bearing 10 to rotate from the first preset working position to a preset working position adjacent to the first preset working position along the target direction associated with the change result, and update the first preset working position to the adjacent preset working position.

[0072] If the rotational speed of the blade can be adjusted to the rated rotational speed in the updated first preset working position, then the updated first preset working position is determined as the second preset working position.

[0073] If the blade speed cannot be adjusted to the rated speed in the updated first preset working position, the control of the pitch bearing 10 to rotate from the updated first preset working position to a preset working position adjacent to the updated first preset working position is repeated along the target direction associated with the change result, and the first preset working position is updated to a preset working position adjacent to the last updated first preset working position until the blade speed can be adjusted to the rated speed in the continuously updated first preset working position.

[0074] Based on this, the control device 30 can control the pitch bearing 10 to rotate to a preset working position adjacent to the target direction associated with the change in the power of the wind turbine generator set. After the rotation is completed, it can determine whether the speed of the blade can be adjusted to the rated speed. If not, the pitch bearing 10 is controlled to rotate to the next preset working position until the speed of the blade can be adjusted to the rated speed, thereby achieving precise control of the pitch system.

[0075] In one example, such as Figure 2As shown, after the wind turbine generator completes its self-start, the control device 30 can control the pitch bearing 10 to rotate counterclockwise from the preset working position where the sensor b1 (i.e., the start-up sensor) is located, and determine whether the power of the wind turbine generator can reach the rated power (i.e., it is in full power generation state) at each preset working position. When the sensor d1 (i.e., the first sensor) and the sensor a0 (i.e., the second sensor) work together, that is, when the pitch bearing 10 is in the preset working position where the sensor a0 is located, if the power of the wind turbine generator reaches the rated power, the blade pitch angle remains unchanged.

[0076] When sensor d1 (i.e., the first sensor) and sensor a0 (i.e., the second sensor) are working together and the wind turbine is generating power at full capacity, if the power of the wind turbine continues to increase, the control device 30 can control the pitch bearing 10 to rotate clockwise (i.e., in the target direction), so that sensor d1 and sensor a1 work together, even if the pitch bearing 10 rotates to the preset working position where sensor a1 is located. When the pitch bearing 10 is in the preset working position where sensor a1 is located, the control device 30 can control the generator electromagnetic torque of the wind turbine to reduce, so as to adjust the blade speed to the rated speed; if the control device 30 determines that the blade speed can be adjusted to the rated speed, then the blade pitch angle remains unchanged; if the control device 30 determines that the blade speed cannot be adjusted to the rated speed, then the control device 30 continues to control the pitch bearing 10 to rotate clockwise, so that sensor d1 and sensor a2 work together, even if the pitch bearing 10 rotates to the preset working position where sensor a2 is located. When the pitch bearing 10 is in the preset working position where the sensor a2 is located, the control device 30 can control the generator electromagnetic torque of the wind turbine to reduce, so as to adjust the speed of the blade to the rated speed. If the control device 30 determines that the speed of the blade can be adjusted to the rated speed, the blade pitch angle is kept unchanged. If the control device 30 determines that the speed of the blade cannot be adjusted to the rated speed, the pitch bearing 10 is controlled to rotate clockwise, ... until the control device 30 determines that the speed of the blade can be adjusted to the rated speed.

[0077] In another example, when sensor d1 (i.e., the first sensor) and sensor a2 (i.e., the second sensor) are working together, that is, when the pitch bearing 10 is in the preset working position where sensor a2 is located, and the wind turbine is generating power at full power, if the power of the wind turbine continues to decrease, the control device 30 can control the pitch bearing 10 to rotate counterclockwise (i.e., in the target direction), so that sensor d1 and sensor a1 work together, that is, the pitch bearing 10 rotates to the preset working position where sensor a1 is located. When the pitch bearing 10 is in the preset working position where sensor a1 is located, the control device 30 can control the generator electromagnetic torque of the wind turbine to reduce, so as to adjust the blade speed to the rated speed; if the control device 30 determines that the blade speed can be adjusted to the rated speed, then the blade pitch angle remains unchanged; if the control device 30 determines that the blade speed cannot be adjusted to the rated speed, then the control device 30 continues to control the pitch bearing 10 to rotate counterclockwise, so that sensor d1 and sensor a0 work together, that is, the pitch bearing 10 rotates to the preset working position where sensor a0 is located. When the pitch bearing 10 is in the preset working position where the sensor a0 is located, the control device 30 can control the generator electromagnetic torque of the wind turbine to reduce, so as to adjust the speed of the blade to the rated speed. If the control device 30 determines that the speed of the blade can be adjusted to the rated speed, the blade pitch angle is kept unchanged. If the control device 30 determines that the speed of the blade cannot be adjusted to the rated speed, the pitch bearing 10 is controlled to rotate clockwise, ... until the control device 30 determines that the speed of the blade can be adjusted to the rated speed.

[0078] The control device 30 controls the rotation of the pitch bearing 10 based on the change result. Specifically, it can control the pitch bearing 10 to change its preset operating position when the power change of the wind turbine generator meets preset conditions, thereby preventing excessively frequent pitch changes in the pitch system. For example, the preset operating position of the pitch bearing 10 can be changed when the absolute value of the power change of the wind turbine generator at full power generation is greater than or equal to a preset power value.

[0079] It should be noted that the preset power can be a value set according to actual needs; or, the above change result can be specifically used to indicate that the change in the power of the wind turbine generator set is greater than or equal to the preset power, which is the product of the rated power of the wind turbine generator set and a preset percentage, thereby making the setting method of the preset power more flexible.

[0080] For example, assuming the preset percentage is 10% and the rated power is P, when the pitch bearing 10 is in the preset working position where sensor a0 is located and the wind turbine is generating power at full power, if the control device 30 determines that the increase in the wind turbine reaches 10%P, it controls the pitch bearing 10 to rotate to the preset working position where sensor a1 is located; similarly, when the pitch bearing 10 is in the preset working position where sensor a2 is located and the wind turbine is generating power at full power, if the control device 30 determines that the decrease in the wind turbine reaches 10%P, it controls the pitch bearing 10 to rotate to the preset working position where sensor a1 is located, and so on.

[0081] In some embodiments, the control device 30 is further configured to control the pitch bearing 10 to switch from the first preset working position to the preset shutdown position when the preset shutdown conditions of the wind turbine generator set are met, wherein the wind turbine generator set is shut down in the preset shutdown position.

[0082] Based on this, the control device 30 can promptly control the pitch bearing 10 to rotate to the preset shutdown position when the wind turbine generator meets the preset shutdown conditions, thereby achieving the shutdown of the wind turbine generator.

[0083] It should be noted that the aforementioned wind turbine generator sets meeting the preset shutdown conditions can be due to the wind turbine generator set receiving a shutdown command, or the wind turbine generator set experiencing a malfunction, etc.

[0084] In some embodiments, from the first preset working position to the Nth preset working position, the blade pitch angle changes in a stepwise manner from low to high;

[0085] The control device 30 is also used for:

[0086] When the wind turbine is operating at full power and the first preset operating position is the Nth preset operating position, if the power of the wind turbine continues to increase, the pitch bearing 10 is controlled to switch from the Nth preset operating position to the preset shutdown position; or

[0087] If the wind turbine generator is not in full power generation mode and the first preset working position is the first preset working position, if the wind speed is less than or equal to the preset wind speed, the pitch bearing 10 is controlled to switch from the first preset working position to the preset shutdown position.

[0088] Based on this, when the wind turbine is generating power at full capacity and the pitch bearing 10 is in the Nth preset working position, if the power of the wind turbine continues to increase, the Nth preset working position is controlled to switch to the preset shutdown position to achieve shutdown protection for the wind turbine when the power is too high, thereby avoiding damage to the wind turbine. When the wind turbine is not generating power at full capacity and the first preset working position is the first preset working position, if the wind speed is less than or equal to the preset wind speed, the pitch bearing 10 is controlled to switch from the first preset working position to the preset shutdown position to achieve shutdown of the wind turbine when the power is too low, thereby reducing the loss of the wind turbine.

[0089] For example, assuming the above-mentioned pitch system only has preset working positions for the locations of the sensors a0-a3, if the wind turbine is in full-power power generation and sensor d1 works in conjunction with sensor a0 (when the pitch bearing 10 is in the Nth preset working position), and if the power of the wind turbine continues to increase and reaches 10%P, then the pitch bearing 10 is controlled to rotate so that sensor d1 works in conjunction with sensor c1 (i.e., the third sensor) to control the wind turbine to stop; if the wind turbine is not in full-power power generation and sensor d1 works in conjunction with sensor a3 (the first preset working position is the first preset working position), and if the wind speed is less than or equal to the preset wind speed, the pitch bearing 10 is controlled to rotate so that sensor d1 works in conjunction with sensor c1 (i.e., the third sensor) to control the wind turbine to stop.

[0090] It should be noted that the first preset working position and the Nth preset working position can each correspond to any two pitch angles of the blade. For example, when the pitch bearing 10 is in the first preset working position, the blade pitch angle is 45°; when the pitch bearing 10 is in the Nth preset working position, the blade pitch angle is 75°, and so on.

[0091] Of course, the control device 30 can also be used to: when the pitch bearing 10 is in the preset stop position and the wind turbine generator set is started, control the pitch bearing 10 to switch from the preset stop position to a preset start position. In the preset start position, the drive device stops driving the wind turbine, thereby enabling the wind turbine to start. Since the start-up process of the wind turbine generator set has been described above, it will not be repeated here.

[0092] Based on the above-described pitch system, this application also provides a wind turbine generator set, including the above-described pitch system.

[0093] Since the specific structure of the pitch system has been described in detail in the above embodiments, and the other structures of the wind turbine generator set (such as the wind turbine) are well known to those skilled in the art, they will not be described in detail here.

[0094] Please see Figure 3 This is a flowchart illustrating an embodiment of the control method for the pitch system of a wind turbine generator provided in this application, applied to the aforementioned pitch system. Figure 3 As shown, the control method for the pitch system of this wind turbine generator set includes at least the following steps:

[0095] Step 301: When the power of the wind turbine generator set is greater than or equal to the first preset power threshold and the pitch bearing of the pitch system is in the first preset working position, monitor the power of the wind turbine generator set, wherein the pitch bearing can rotate between N preset working positions and the blade pitch angle is different in different preset working positions, where N is an integer greater than 1.

[0096] Step 302: When the wind turbine generator is detected to be generating power at full power, the pitch bearing is controlled to rotate M times discontinuously, so that the pitch bearing is switched from the first preset working position to the second preset working position. In the second preset working position, the speed of the blade can be adjusted to the rated speed, and M is a positive integer.

[0097] In some embodiments, controlling the pitch bearing to rotate discontinuously M times to switch the pitch bearing from the first preset operating position to the second preset operating position includes:

[0098] When the wind turbine generator is detected to be generating power at full capacity, the change in the power of the wind turbine generator is obtained, and the change is used to indicate whether the power of the wind turbine generator increases or decreases.

[0099] Control the pitch bearing to rotate from the first preset working position to a preset working position adjacent to the first preset working position along the target direction associated with the change result, and update the first preset working position to the adjacent preset working position;

[0100] If the rotational speed of the blade can be adjusted to the rated rotational speed in the updated first preset working position, then the updated first preset working position is determined as the second preset working position.

[0101] If the blade speed cannot be adjusted to the rated speed in the updated first preset working position, the control of the pitch bearing to rotate along the target direction associated with the change result from the updated first preset working position to a preset working position adjacent to the updated first preset working position is repeated, and the first preset working position is updated to a preset working position adjacent to the last updated first preset working position, until the blade speed can be adjusted to the rated speed in the continuously updated first preset working position.

[0102] In some implementations, the change result is specifically used to indicate that the amount of increase or decrease in the power of the wind turbine generator set is greater than or equal to a preset power, which is the product of the rated power of the wind turbine generator set and a preset percentage.

[0103] In some embodiments, the method further includes:

[0104] If the preset shutdown conditions of the wind turbine generator set are met, the pitch bearing is controlled to switch from the first preset working position to the preset shutdown position, wherein the wind turbine generator set is shut down in the preset shutdown position.

[0105] In some embodiments, the blade pitch angle changes in a stepwise manner from low to high from the first preset working position to the Nth preset working position.

[0106] When the preset shutdown conditions of the wind turbine generator are met, controlling the pitch bearing to switch from the first preset working position to the preset shutdown position may include:

[0107] When the wind turbine is operating at full power and the first preset operating position is the Nth preset operating position, if the power of the wind turbine continues to increase, the pitch bearing is controlled to switch from the Nth preset operating position to the preset shutdown position; or

[0108] If the wind turbine is not in full power generation mode and the first preset working position is the first preset working position, and the wind speed is less than or equal to the preset wind speed, then the pitch bearing is controlled to switch from the first preset working position to the preset shutdown position.

[0109] In some implementations, it also includes:

[0110] When the pitch bearing is in the preset shutdown position and the wind turbine generator is started, control the pitch bearing to switch from the preset shutdown position to the preset start position.

[0111] Regarding the methods in the above embodiments, the implementation process of each implementation method has been described in detail in the embodiments of the pitch system of the wind turbine generator set, and the effects that each implementation method can achieve have also been described in detail in the embodiments of the pitch system of the wind turbine generator set, and will not be elaborated here.

[0112] Please see Figure 4 This is a schematic diagram of the structure of an embodiment of the control device for the pitch system of the wind turbine generator provided in this application. Figure 4 As shown, the device 400 includes:

[0113] The monitoring module 401 is used to monitor the power of the wind turbine generator set when the power of the wind turbine generator set is greater than or equal to a first preset power threshold and the pitch bearing of the pitch system is in a first preset working position. The pitch bearing can rotate between N preset working positions and the blade pitch angle is different in different preset working positions. N is an integer greater than 1.

[0114] The first control module 402 is used to control the pitch bearing to rotate M times discontinuously when the wind turbine generator is detected to be in full power generation state, so that the pitch bearing switches from the first preset working position to the second preset working position. In the second preset working position, the speed of the blade can be adjusted to the rated speed, and M is a positive integer.

[0115] In some implementations, the first control module 402 includes:

[0116] The change result acquisition unit is used to acquire the change result of the power of the wind turbine generator set when the wind turbine generator set is detected to be in full power generation state. The change result is used to indicate whether the power of the wind turbine generator set increases or decreases.

[0117] The first update unit is used to control the pitch bearing to rotate from the first preset working position to a preset working position adjacent to the first preset working position along the target direction associated with the change result, and update the first preset working position to the adjacent preset working position.

[0118] The second updating unit is used to determine the updated first preset working position as the second preset working position if the rotational speed of the blade can be adjusted to the rated rotational speed under the updated first preset working position.

[0119] The repeat execution unit is configured to, in the updated first preset working position, if the rotational speed of the blade cannot be adjusted to the rated rotational speed, repeatedly execute control to rotate the pitch bearing along the target direction associated with the change result from the first preset working position to a preset working position adjacent to the first preset working position, and update the first preset working position to the adjacent preset working position.

[0120] In some implementations, the change result is specifically used to indicate that the amount of increase or decrease in the power of the wind turbine generator set is greater than or equal to a preset power, which is the product of the rated power of the wind turbine generator set and a preset percentage.

[0121] In some embodiments, the device 400 further includes:

[0122] The second control module is used to control the pitch bearing to switch from the first preset working position to the preset shutdown position when the preset shutdown conditions of the wind turbine generator are met.

[0123] In some embodiments, the blade pitch angle changes in a stepwise manner from low to high from the first preset working position to the Nth preset working position.

[0124] The second control module can be specifically used for:

[0125] When the wind turbine is operating at full power and the first preset operating position is the Nth preset operating position, if the power of the wind turbine continues to increase, the pitch bearing is controlled to switch from the Nth preset operating position to the preset shutdown position; or

[0126] If the wind turbine is not in full power generation mode and the first preset working position is the first preset working position, and the wind speed is less than or equal to the preset wind speed, then the pitch bearing is controlled to switch from the first preset working position to the preset shutdown position.

[0127] In some embodiments, the device 400 further includes:

[0128] The third control module is used to control the pitch bearing to switch from the preset stop position to the preset start position when the pitch bearing is in the preset stop position and the wind turbine generator is started.

[0129] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments of the method, and the effects that each implementation can achieve have also been described in detail in the embodiments of the method, and will not be elaborated here.

[0130] This application also provides a computer storage medium storing computer-executable instructions for implementing the control method of the pitch system of the wind turbine generator described in this application.

[0131] The processor is the controller in the pitch system described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks. Examples of computer-readable storage media include non-transitory computer-readable storage media, such as read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0132] This application also provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the control method for the pitch system of a wind turbine generator described in this application.

[0133] The computer program product may employ any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0134] This application is described with reference to flowchart illustrations and / or block diagrams of the methods, apparatus, and computer program products according to this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable transaction data statistical device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable transaction data statistical device, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1A device that provides the functions specified in one or more boxes.

[0135] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable transaction data statistical device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including an instruction means, which is implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0136] These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable device for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0137] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0138] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A pitch control system for a wind turbine generator set, characterized in that, include: A pitch bearing is connected to the blades of the wind turbine generator set and is used to rotate between N preset working positions. The blade pitch angle is different under different preset working positions, and N is an integer greater than 1; A rotational position detection device is used to detect the first preset working position of the pitch bearing among the N preset working positions; A control device, connected to the pitch bearing and the rotational position detection device, and the control device is used for: When the wind turbine generator is in full-power power generation mode and the power of the wind turbine generator changes, the pitch bearing is controlled to rotate M times discontinuously, so that the pitch bearing switches from the first preset working position to the second preset working position. In the second preset working position, the speed of the blade can be adjusted to the rated speed, and M is a positive integer. The rotational position detection device includes a first sensor and N second sensors: The first sensor is connected to the inner ring of the pitch bearing or the outer ring of the pitch bearing; The N second sensors are arranged sequentially at intervals around the outer ring of the pitch bearing, and the first sensor rotates under the drive of the pitch bearing, cooperating with each of the second sensors respectively. When the first sensor cooperates with different second sensors, the pitch bearing is in different preset working positions; or... The rotational position detection device includes a sensor mounted on a rotating shaft connected to the pitch bearing.

2. The pitch system according to claim 1, characterized in that, The control device is specifically used for: When the wind turbine generator is detected to be generating power at full capacity, the change in the power of the wind turbine generator is obtained, and the change is used to indicate whether the power of the wind turbine generator increases or decreases. Control the pitch bearing to rotate from the first preset working position to a preset working position adjacent to the first preset working position along the target direction associated with the change result, and update the first preset working position to the adjacent preset working position; If the rotational speed of the blade can be adjusted to the rated rotational speed in the updated first preset working position, then the updated first preset working position is determined as the second preset working position. If the blade speed cannot be adjusted to the rated speed in the updated first preset working position, the control of the pitch bearing to rotate along the target direction associated with the change result from the updated first preset working position to a preset working position adjacent to the updated first preset working position is repeated, and the first preset working position is updated to a preset working position adjacent to the last updated first preset working position, until the blade speed can be adjusted to the rated speed in the continuously updated first preset working position.

3. The pitch system according to claim 1 or 2, characterized in that, The control device is also used to control the pitch bearing to switch from the first preset working position to the preset shutdown position when the preset shutdown conditions of the wind turbine generator are met.

4. The pitch system according to claim 3, characterized in that, From the first preset working position to the Nth preset working position, the blade pitch angle changes in a stepwise manner from low to high; The control device is also used for: When the wind turbine generator is in full power generation mode and the first preset working position is the Nth preset working position, if the power of the wind turbine generator continues to increase, the pitch bearing is controlled to switch from the Nth preset working position to the preset shutdown position. or If the wind turbine is not in full power generation mode and the first preset working position is the first preset working position, if the wind speed is less than or equal to the preset wind speed, the pitch bearing is controlled to switch from the first preset working position to the preset shutdown position.

5. The pitch system according to claim 4, characterized in that, The rotational position detection device further includes: A third sensor is disposed around the outer ring of the pitch bearing, and the position of the third sensor differs from the positions of the N second sensors, wherein: When the first sensor rotates to cooperate with the third sensor, the pitch bearing is in a preset stop position.

6. The pitch system according to claim 3, characterized in that, The control device is also used for: When the pitch bearing is in the preset shutdown position and the wind turbine generator is started, control the pitch bearing to switch from the preset shutdown position to the preset start position.

7. The pitch system according to claim 6, characterized in that, The rotational position detection device further includes: A fourth sensor is disposed around the outer ring of the pitch bearing, and the fourth sensor is located between the N second and third sensors, wherein: When the first sensor rotates to cooperate with the fourth sensor, the pitch bearing is in a preset start-up position.

8. A wind turbine generator set, characterized in that, Includes the pitch system as described in any one of claims 1 to 7.

9. A control method for a pitch system of a wind turbine generator set, characterized in that, include: When the power of the wind turbine generator set is greater than or equal to a first preset power threshold and the pitch bearing of the pitch system is in a first preset working position, the power of the wind turbine generator set is monitored. The pitch bearing can rotate between N preset working positions, and the blade pitch angle of the wind turbine generator set is different in different preset working positions, where N is an integer greater than 1. When the wind turbine generator is detected to be generating power at full capacity, the pitch bearing is controlled to rotate M times discontinuously, so that the pitch bearing switches from the first preset working position to the second preset working position. In the second preset working position, the speed of the blade can be adjusted to the rated speed, and M is a positive integer.

10. The method according to claim 9, characterized in that, The method of controlling the pitch bearing to rotate discontinuously M times, so as to switch the pitch bearing from the first preset working position to the second preset working position, includes: When the wind turbine generator is detected to be generating power at full capacity, the change in the power of the wind turbine generator is obtained, and the change is used to indicate whether the power of the wind turbine generator increases or decreases. Control the pitch bearing to rotate from the first preset working position to a preset working position adjacent to the first preset working position along the target direction associated with the change result, and update the first preset working position to the adjacent preset working position; If the rotational speed of the blade can be adjusted to the rated rotational speed in the updated first preset working position, then the updated first preset working position is determined as the second preset working position. If the blade speed cannot be adjusted to the rated speed in the updated first preset working position, the control of the pitch bearing to rotate along the target direction associated with the change result from the updated first preset working position to a preset working position adjacent to the updated first preset working position is repeated, and the first preset working position is updated to a preset working position adjacent to the last updated first preset working position, until the blade speed can be adjusted to the rated speed in the continuously updated first preset working position.

11. The method according to claim 10, characterized in that, The change result is specifically used to indicate that the change in the power of the wind turbine generator set is greater than or equal to a preset power, which is the product of the rated power of the wind turbine generator set and a preset percentage.

12. The method according to any one of claims 9 to 11, characterized in that, The method further includes: When the preset shutdown conditions of the wind turbine generator are met, the pitch bearing is controlled to switch from the first preset working position to the preset shutdown position.

13. The method according to claim 12, characterized in that, From the first preset working position to the Nth preset working position, the blade pitch angle changes in a stepwise manner from low to high. When the preset shutdown conditions of the wind turbine generator are met, controlling the pitch bearing to switch from the first preset operating position to the preset shutdown position includes: When the wind turbine is operating at full power and the first preset operating position is the Nth preset operating position, if the power of the wind turbine continues to increase, the pitch bearing is controlled to switch from the Nth preset operating position to the preset shutdown position; or If the wind turbine is not in full power generation mode and the first preset working position is the first preset working position, if the wind speed is less than or equal to the preset wind speed, the pitch bearing is controlled to switch from the first preset working position to the preset shutdown position.

14. The method according to any one of claims 9 to 11, characterized in that, Also includes: When the pitch bearing is in the preset stop position and the wind turbine generator is started, control the pitch bearing to switch from the preset stop position to the preset start position.

15. A control device for the pitch system of a wind turbine generator set, characterized in that, include: The monitoring module is used to monitor the power of the wind turbine generator set when the power of the wind turbine generator set is greater than or equal to a first preset power threshold and the pitch bearing of the pitch system is in a first preset working position. The pitch bearing can rotate between N preset working positions, and the blade pitch angle of the wind turbine generator set is different in different preset working positions, where N is an integer greater than 1. The first control module is used to control the pitch bearing to rotate M times discontinuously when the wind turbine generator is detected to be in full power generation state, so that the pitch bearing switches from the first preset working position to the second preset working position. In the second preset working position, the speed of the blade can be adjusted to the rated speed, and M is a positive integer.

16. The apparatus according to claim 15, characterized in that, The first control module includes: The change result acquisition unit is used to acquire the change result of the power of the wind turbine generator set when the wind turbine generator set is detected to be in full power generation state. The change result is used to indicate whether the power of the wind turbine generator set increases or decreases. The first update unit is used to control the pitch bearing to rotate from the first preset working position to a preset working position adjacent to the first preset working position along the target direction associated with the change result, and update the first preset working position to the adjacent preset working position. The second updating unit is used to determine the updated first preset working position as the second preset working position if the rotational speed of the blade can be adjusted to the rated rotational speed under the updated first preset working position. The repeat execution unit is configured to, in the updated first preset working position, if the rotational speed of the blade cannot be adjusted to the rated rotational speed, repeatedly execute the control to rotate the pitch bearing along the target direction associated with the change result from the updated first preset working position to a preset working position adjacent to the updated first preset working position, and continue to update the first preset working position to a preset working position adjacent to the last updated first preset working position, until the rotational speed of the blade can be adjusted to the rated rotational speed in the continuously updated first preset working position.

17. The apparatus according to claim 15 or 16, characterized in that, Also includes: The second control module is used to control the pitch bearing to switch from the first preset working position to the preset shutdown position when the preset shutdown conditions of the wind turbine generator are met.

18. The apparatus according to claim 15 or 16, characterized in that, Also includes: The third control module is used to control the pitch bearing to switch from the preset stop position to the preset start position when the pitch bearing is in the preset stop position and the wind turbine is started.

19. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the control method for the pitch system of a wind turbine generator as described in any one of claims 9 to 14.

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