A pitch drive control method for wind power

Abstract

This invention discloses a pitch drive control method for wind power, characterized by the following steps: setting at least one installation mode in the pitch drive unit; using knob one to enter or exit the installation mode; and simultaneously, when the pitch drive control unit enters the installation mode, using knob two to control the movement of the pitch bearing in the installation mode, including controlling the blades to start feathering, stop movement, and start pitch opening. This invention is mainly applied to the installation, calibration, and subsequent maintenance of pitch wind turbine blades, providing a pitch operation mode that eliminates the need for specific blade lifting tools or other additional tooling to assist blade installation. Pitch bearing angle adjustment replaces blade tilting during lifting, and this mode can also be used for blade angle calibration and subsequent unit maintenance. The mode disclosed in this invention can effectively improve on-site installation efficiency, eliminate additional equipment costs, ensure on-site installation safety, and facilitate subsequent maintenance.

Description

Technical Field

[0001] This invention relates to a variable pitch operation mode during blade hoisting, blade calibration, and periodic inspection and maintenance, and belongs to the technical field of variable pitch wind turbine generators. Background Technology

[0002] The main structural feature of variable pitch wind turbine generators is the connection between the blade root and the hub using bearings capable of withstanding radial and axial loads. The blade pitch angle can be adjusted by a variable pitch mechanism. With the increasing installed capacity of wind turbine generators in recent years, the length and weight of the blades have also increased. Larger blades place higher demands on the performance of cranes. During installation, excessive blade tilt angles or additional tension on the lifting clamps can easily lead to safety accidents, causing significant inconvenience to blade installation.

[0003] Patent application CN111994787A discloses a blade lifting fixture, which requires a blade lifting tool to clamp and rotate the blade, replacing a turning mechanism for blade installation. Utility model patent CN216691705U discloses a manual single-blade pitch control hydraulic station for wind turbine generators. In this utility model patent, hydraulic oil needs to be added to the hydraulic station before manually pressing a manual pump to control the hydraulic actuator and achieve blade pitch control. Utility model patent CN211338512U discloses a special lifting tool for blade flipping. This utility model patent requires a special lifting tool to adjust the blade tilt angle and the blade-to-hole angle to complete the blade installation. Similar to patent application CN111994787A, these applications all require specific lifting tools to assist in blade installation. Summary of the Invention

[0004] The technical problem to be solved by this invention is that there is little information on the hoisting of wind turbine blades, and most of the work requires specific hoisting tools or other additional tooling to align the blades with the pitch bearings.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is to provide a pitch drive control method for wind power, characterized by comprising the following steps:

[0006] At least two operating modes are set in the pitch drive unit, including at least the installation mode. When the pitch drive unit enters the installation mode, the pitch control unit will not act according to the host computer command, and will not feather due to system power failure or triggering other protection.

[0007] The pitch drive control unit can be put into or taken out of the installation mode by using knob one. At the same time, when the pitch drive control unit is in the installation mode, the operation of the pitch bearing in the installation mode can be controlled by using knob two, including controlling the blade to start feathering, stop the operation and start opening the blade.

[0008] The pitch drive unit and the driver that drives the pitch bearing are powered by the main power supply and a supercapacitor that serves as a backup power supply.

[0009] When performing blade installation / replacement, blade angle calibration, and periodic checks and maintenance related to pitch, use knob one to put the pitch drive control unit into installation mode, and then use knob two to control the blade movement in installation mode, thereby completing blade installation / replacement, blade angle calibration, and periodic checks and maintenance related to pitch.

[0010] Preferably, during blade installation / replacement:

[0011] The pitch drive control unit is put into the installation mode by rotating the knob, and the pitch bearing remains stationary.

[0012] Once the blades are close to the pitch bearing, rotate knob two according to the actual position of the blade flange and the bearing to control the pitch bearing to adjust the angle at a low speed until the bearing hole of the pitch bearing corresponds to the blade flange.

[0013] By turning knob two, the pitch bearing is stopped from moving and its state is maintained.

[0014] Complete the installation / replacement of the propeller blades.

[0015] Preferably, when installing / replacing the blades, the knob can be repeatedly adjusted to ensure that the bolts inside the hub web can complete the torque operation.

[0016] Preferably, during blade angle calibration:

[0017] The pitch control unit is put into the installation mode by rotating the knob.

[0018] Repeatedly rotate the second knob to control the blade to rotate at a low speed until it reaches the ideal position. Then rotate the second knob again until the blade stops moving, maintain the blade state, and assist in calibrating the blade angle.

[0019] After completing the blade calibration work, rotate knob one to exit the installation mode of the pitch control unit.

[0020] Preferably, during routine checks and maintenance related to pitch:

[0021] The pitch control unit is put into the installation mode by using knob one, and the blade is stopped from moving by using knob two. When needed, knob two is rotated to control the blade to rotate at a low speed, which helps to carry out a series of inspections and maintenance work in the hub and improves the convenience of maintenance work.

[0022] After completing the inspection and maintenance work, rotate knob one to exit the installation mode of the pitch control unit. When the pitch control unit exits the installation mode and returns to the normal operation mode, there is a certain transition period. Before the set time is reached, the pitch control unit will not perform pitching action to ensure that the staff can safely exit the hub area.

[0023] This invention is primarily applied to the installation, calibration, and subsequent maintenance of blades in variable pitch wind turbine generators. It presents a variable pitch operation mode that eliminates the need for specific blade lifting tools or other additional equipment to assist in blade installation. Instead of tilting the blades during installation, the variable pitch bearing angle is adjusted. This mode can also be used for blade angle calibration and subsequent turbine maintenance. The mode disclosed in this invention effectively improves on-site installation efficiency, eliminates additional equipment costs, ensures on-site installation safety, and facilitates subsequent maintenance. Attached Figure Description

[0024] Figure 1 The hardware schematic diagram is for applying this invention. Detailed Implementation

[0025] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0026] Generally, before the blades are installed in a variable pitch wind turbine, the pitch drive control unit inside the hub already has the ability to directly operate with power. Therefore, after directly powering the pitch drive control unit, the pitch bearing can be controlled to operate in its specific operating mode.

[0027] In the solutions disclosed in this invention, such as Figure 1 As shown, the pitch system includes a main power supply, a control power supply, and a supercapacitor to power the pitch drive control unit and the driver. The supercapacitor serves as backup power in case of system power failure and can guarantee at least three feathering maneuvers. The pitch drive unit has multiple operating modes, one of which (hereinafter referred to as "installation mode") is independent of the normal operating logic and can be used during blade installation, blade angle calibration, and periodic pitch-related inspections and maintenance.

[0028] The pitch drive control unit is equipped with two knobs for the installation mode: Knob A is used to enter and exit installation mode, with two positions: enter installation mode and exit installation mode; Knob B is used to control the actions in installation mode, with three positions: start feathering, stop action, and start propeller opening. Normally, knob A is in the "exit installation mode" position and knob B is in the "stop action" position. When knob A is rotated to the "enter installation mode" position, emergency feathering occurs without being controlled by the host computer or the internal protection logic of the pitch drive control unit. Knob B only becomes active after knob A is rotated to the "enter installation mode" position.

[0029] No. equipment model 1 controller Homemade pitch control module (using STM32 chip) 2 drive FD144S-CB-000 3 Control power supply RSD100C-24 4 main power supply RSR3000-48 5 Control power supply RSD200C-48 6 Supercapacitor M14S-060-05S 7 motor SMC130D-0180-30ABK-4DKR

[0030] Table 1

[0031] In this embodiment, Figure 1 The selection of various hardware devices is shown in Table 1 above.

[0032] During blade installation, knob A is used to put the pitch drive control unit into installation mode, while knob B remains in the "stop" position. Once the blade and pitch bearing are close together, knob B is rotated to the "start feathering" or "start opening" position, depending on the actual position of the blade flange and bearing. This controls the pitch bearing to adjust its angle at a low speed until the bearing bore aligns with the blade flange. Knob B is then rotated back to the "stop" position to maintain the bearing's position. Depending on the actual installation requirements, knob B can be repeatedly adjusted to ensure the bolts in the hub web can operate at torque. During this stage, the pitch control unit is unaffected by system power failure; that is, the pitch will not trigger feathering protection. Even in the event of a power failure, the supercapacitor has sufficient energy to complete this process.

[0033] Similarly, the same method can be used for blade replacement.

[0034] During routine maintenance of the pitch and blades, the pitch drive control unit can be put into installation mode by turning knob A. In this mode, the pitch control unit will not act according to commands from the host computer, nor will it feather due to system power failure or triggering of other protection mechanisms. When knob B is in the "Stop Action" position, the pitch control unit will not operate, ensuring the safety of maintenance work. When needed, knob B can be rotated to the "Start Feathering" or "Start Spreading" position to control the blades to rotate at low speed, assisting in a series of inspections and maintenance work within the hub, improving the convenience of maintenance work. After completing the inspection and maintenance work, knob A must be returned to the original position to exit installation mode and return the pitch control unit to normal operation mode. There is a certain transition period when the pitch control unit exits installation mode and returns to normal operation mode. Before the set time is reached, the pitch control unit will not perform pitch actions, ensuring that personnel can safely exit the hub area and guaranteeing the safety of maintenance and repair work.

[0035] During blade angle calibration, knob A can be used to deactivate the pitch control unit from the host computer's commands and its own protection logic. Then, repeatedly rotate knob B to the "Start Feathering" or "Start Spreading" position to control the blades at low speed until they reach the ideal position. Finally, rotate knob B to the "Stop Operation" position to maintain the blade position and assist in blade angle calibration. After completing the blade calibration, rotate knob A to exit the installation mode of the pitch control unit.

Claims

1. A pitch drive control method for wind power, characterized in that, Includes the following steps: At least two operating modes are set in the pitch drive unit, including at least the installation mode. When the pitch drive unit enters the installation mode, the pitch control unit will not act according to the host computer command, and will not feather due to system power failure or triggering other protection. The pitch drive control unit can be put into or taken out of the installation mode by using knob one. At the same time, when the pitch drive control unit is in the installation mode, the operation of the pitch bearing in the installation mode can be controlled by using knob two, including controlling the blade to start feathering, stop the operation and start opening the blade. The pitch drive unit and the driver that drives the pitch bearing are powered by the main power supply and a supercapacitor that serves as a backup power supply. When performing blade installation / replacement, blade angle calibration, and periodic checks and maintenance related to pitch, use knob one to put the pitch drive control unit into installation mode, and then use knob two to control the blade movement in installation mode, thereby completing blade installation / replacement, blade angle calibration, and periodic checks and maintenance related to pitch.

2. The pitch drive control method for wind power as described in claim 1, characterized in that, When installing / replacing propeller blades: The pitch drive control unit is put into the installation mode by rotating the knob, and the pitch bearing remains stationary. Once the blades and pitch bearings are close together, rotate knob two according to the actual positions of the blade flange and the bearing to control the pitch bearing to adjust the angle at a low speed until the bearing hole of the pitch bearing corresponds to the blade flange. By turning knob two, the pitch bearing is stopped from moving and its state is maintained. Complete the installation / replacement of the propeller blades.

3. The pitch drive control method for wind power as described in claim 2, characterized in that, When installing / replacing the blades, the knob can be repeatedly adjusted to ensure that the bolts inside the hub web can complete the torque operation.

4. The pitch drive control method for wind power as described in claim 1, characterized in that, When performing blade angle calibration: The pitch control unit is put into the installation mode by rotating the knob. Repeatedly rotate the second knob to control the blade to rotate at a low speed until it reaches the ideal position. Then rotate the second knob again until the blade stops moving, maintain the blade state, and assist in calibrating the blade angle. After completing the blade calibration work, rotate knob one to exit the installation mode of the pitch control unit.

5. The pitch drive control method for wind power as described in claim 1, characterized in that, During routine checks and maintenance related to pitch control: The pitch control unit is put into the installation mode by using knob one, and the blades are stopped from moving by using knob two. When needed, knob two is rotated to control the blades to rotate at a low speed, which helps to perform a series of inspections and maintenance work in the hub and improves the convenience of maintenance work. After completing the inspection and maintenance work, rotate knob one to exit the installation mode of the pitch control unit. When the pitch control unit exits the installation mode and returns to the normal operation mode, there is a certain transition period. Before the set time is reached, the pitch control unit will not perform pitching action to ensure that the staff can safely exit the hub area.

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