Method and system for preventing wind turbine blade-tower collision

Abstract

A method and system for preventing wind turbine blade-tower collision. The method comprises: step 1: calculating a boundary pitch angle on the basis of the operating state of a wind turbine blade, and recording the boundary pitch angle as A0; step 2: calculating a required operating time for the blade to move from 0° to the boundary pitch angle A0, and determining a pitch position P0 on the basis of the operating time; step 3: determining a blade passing through the pitch position P0 on the basis of the pitch position P0; step 4: performing blade-tower collision preventing operating state determination on the blade passing through the pitch position P0 to obtain a determination result; and step 5: performing blade-tower collision preventing operation on the basis of the determination result.

Description

A wind turbine blade anti-sweep tower method and system Technical Field

[0001] The present invention belongs to the technical field of wind power generation, and in particular relates to a method and system for preventing blades from sweeping a tower of a wind turbine. Background Art

[0002] The tower of a wind turbine is a critical component of the entire turbine, supporting the blades and all equipment within the nacelle. To maximize wind energy capture and reduce turbine costs, wind turbines are increasingly adopting larger, longer blades. The increasing size and weight of blades inevitably lead to increased deformation, severely impacting the clearance between the blades and the tower. Furthermore, the complex and ever-changing operating environment of wind turbines significantly increases the risk of blade sweeps. Blade sweeps can damage the blades at best, or even cause the turbine tower to collapse, resulting in significant equipment and financial losses, and even personal injury. Therefore, it is crucial to prevent wind turbine tower sweeps.

[0003] Currently, clearance detection mainly detects the distance between the blades and the tower. When the distance is too small, the unit sends a signal to shut down or reduce power. However, the error is large and it is easily affected by the surrounding environment, and the reliability is low. Another method is to limit the power of the unit to reduce the bending degree of the blades, but the economic efficiency is poor. Summary of the Invention

[0004] The purpose of the present invention is to solve the technical problem of existing wind turbines being able to effectively avoid the occurrence of tower sweep accidents to ensure the safe and stable operation of wind turbines, and to provide a method and system for preventing wind turbine blades from sweeping the tower.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a method for preventing the sweep tower of a wind turbine blade, comprising the following steps: 1: calculating a boundary pitch angle according to an operating state of the wind turbine blade, and recording the boundary pitch angle as A0; 2: calculating the operating time required for the blade to change from 0° to the boundary pitch angle AO, and determining a pitch position P0 according to the operating time; 3: determining a blade passing through the pitch position P0 according to the pitch position P0; 4: determining the operating state of the anti-sweep tower for the blade passing through the pitch position P0, and obtaining a determination result; and 5: performing anti-sweep tower operation according to the determination result.

[0007] Furthermore, step 3: determining the blade passing through the pitch position P0 through the blade identification system according to the pitch position P0.

[0008] Furthermore, the blade identification system is: using a laser signal meter in combination with a reflective strip to determine the blade passing the pitch position P0.

[0009] Furthermore, the laser signal instrument receives a pulse signal of 0.1S.

[0010] Furthermore, the anti-sweep tower working status determination method includes: one method of determining whether to enter the anti-sweep tower operation based on the rated wind speed, and the other method of determining whether to enter the anti-sweep tower operation based on the average wind speed turbulence.

[0011] Furthermore, the determination of whether to enter the anti-sweep tower operation is based on the rated wind speed. Specifically, the rated wind speed is set to WS0. When the 10-minute average wind speed exceeds (rated wind speed WS0-2) m / s, the wind turbine enters the anti-sweep tower operation.

[0012] Furthermore, the determination of whether to enter the anti-sweep tower operation is based on the average wind speed turbulence. Specifically, when the wind speed is 5m / s and above, the turbulence limit T0 is set. When the 20-minute average turbulence is greater than T0, the wind turbine enters the anti-sweep tower operation.

[0013] Furthermore, step 5: the anti-sweep tower works: specifically, the unit main control receives the blade signal passing the pitch position P0, and the blade immediately performs independent pitch change work until the boundary pitch angle A0 angle no longer continues to change the pitch, and the blade returns to normal operating state and accepts normal commands from the unit main control.

[0014] A wind turbine blade anti-sweep tower system includes an independent pitch control system, a blade identification system, turbine operating condition information, a data collector, a microprocessor, and a turbine main controller;

[0015] The independent pitch control system calculates the boundary pitch angle A0 according to the operating status of the wind turbine blades, and can realize the independent pitch control of the blades;

[0016] The blade identification system uses a laser signal meter combined with a reflective strip to identify blades passing through the pitch position P0. The turbine operating condition information includes the blade angle information and wind speed information of the wind turbine blades. The data collector collects the blade angle information, blade position information, and wind speed information, records the running time required for the blade to move from 0° to the boundary pitch angle AO, and transmits it to the microprocessor.

[0017] The microprocessor: analyzes and judges the received data

[0018] The rated wind speed is WS0. When the 10-minute average wind speed exceeds (rated wind speed WS0-2) m / s, the wind turbine enters the anti-sweep tower operation; in the wind speed range of 5 m / s and above, the turbulence limit T0 is set. When the 20-minute average turbulence is greater than T0, the wind turbine enters the anti-sweep tower operation; the main controller of the unit: adjusts the blade angle, receives the blade signal passing through the pitch position P0, and the blade immediately performs independent pitch change work until the boundary pitch angle A0 angle no longer continues to change pitch, and the blade resumes normal operation and accepts normal commands from the unit main control.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] The wind turbine blade anti-sweep tower method of the present invention fully utilizes the independent pitch system to effectively control a single blade without installing additional blade position detection equipment.

[0021] The invention provides a method for preventing blades from sweeping the tower of a wind turbine set, which scientifically and rationally calculates the boundary pitch angle at which the blades do not sweep the tower, thereby avoiding excessive pitch change to increase the imbalance of the blades.

[0022] The blade identification system in the wind turbine blade anti-sweep tower method of the present invention can effectively judge the blades passing through P0, so that the main control system can accurately control it.

[0023] The wind turbine blade anti-sweep tower method of the present invention determines the anti-sweep tower working state of the blade passing P0, thereby preventing the occurrence of the tower sweep and avoiding invalid pitch change.

[0024] The present invention provides a method for preventing blades from sweeping the tower of a wind turbine generator set based on the occurrence of tower sweep, and the solution is efficient and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a flow chart of a method for preventing wind turbine blades from sweeping towers according to the present invention;

[0026] FIG2 is a schematic diagram of the structure of a possible tower sweeping according to the present invention;

[0027] FIG3 is a schematic structural diagram of a blade from a first perspective according to an embodiment of the present invention;

[0028] FIG4 is a schematic structural diagram of a blade from a second viewing angle according to an embodiment of the present invention;

[0029] FIG5 is a schematic structural diagram of the installation position of the laser signal instrument according to an embodiment of the present invention;

[0030] FIG6 is a schematic structural diagram of the installation position of the reflective strip in an embodiment of the present invention. Modes for Carrying Out the Invention

[0031] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0032] Example 1

[0033] As shown in FIG1 , a method for preventing wind turbine blades from sweeping a tower includes the following steps:

[0034] Step 1: Calculate the boundary pitch angle according to the operating state of the wind turbine blades, and record the boundary pitch angle as A0;

[0035] Step 2: Calculate the running time required for the blade to move from 0° to the boundary pitch angle AO, and determine the pitch position P0 based on the running time;

[0036] Step 3: determining the blade passing through the pitch position P0 according to the pitch position;

[0037] Step 4: performing an anti-sweep tower working state determination on the blade passing through the pitch position P0 to obtain a determination result;

[0038] Step 5: Perform anti-sweeping tower work according to the determination result.

[0039] In step 1, when the blades are fully opened to 0°, the blades are subjected to the greatest force and are most likely to sweep the tower. When the blades are fully retracted to 90°, tower sweep will not occur. Based on the operating status of the wind turbine blades, the boundary pitch angle is calculated and recorded as A0. At the same time, the boundary pitch angles are different for blades of different lengths.

[0040] In step 2, the running time required for the blade to move from 0° to the boundary pitch angle AO is calculated, and the pitch position P0 is determined based on the running time. It takes a certain amount of time T for the blade to move from 0° or other angles to the boundary pitch angle AO. During this time, it is necessary to ensure that the blade has not yet rotated to the tower position or has just reached the tower position. This process includes two rotation processes, as shown in Figures 3 and 4, one is the pitch angle from 0° or other angles to the boundary pitch angle A0, and the other is the entire blade from the beginning of pitch change to the tower position. It should be noted that: T represents the time required from 0° to the boundary pitch angle A0, but the blade does not necessarily start moving from 0°. From 0° to the boundary pitch angle A0 is the maximum angle that needs to be changed. During the whole process, the pitch speed remains unchanged and the impeller rotation speed.

[0041] In step 3, the blades passing through the pitch position P0 are determined according to the pitch position. As shown in Figures 5 and 6, a laser signal meter is combined with a reflection bar to determine the blades passing through the pitch position P0. The reflection bar is installed on the main shaft flange, and the laser signal meter is installed on the main frame and adapted to the pitch position P0. At the same time, the laser signal meter receives a pulse signal of 0.1S.

[0042] In step 4, the anti-sweep tower working state is determined for the blades passing the pitch position P0, and a determination result is obtained, specifically: there are two types of anti-sweep tower working state determinations, one is to determine whether to enter the anti-sweep tower operation based on the rated wind speed, and the other is to determine whether to enter the anti-sweep tower operation based on the average wind speed turbulence; determining whether to enter the anti-sweep tower operation based on the rated wind speed is specifically as follows: setting the rated wind speed to WS0, when the 10-minute average wind speed exceeds (rated wind speed WS0-2) m / s, the unit enters the anti-sweep tower operation; determining whether to enter the anti-sweep tower operation based on the average wind speed turbulence is specifically as follows: in the wind speed range of 5m / s and above, setting the turbulence limit T0, when the 20-minute average turbulence is greater than the turbulence limit T0, the unit enters the anti-sweep tower operation.

[0043] In step 5, anti-sweep tower work is performed according to the judgment result, specifically: the unit main control receives the blade signal passing the pitch position P0, and the blade immediately performs independent pitch change work until the boundary pitch angle A0 no longer continues to change the pitch, and the blade returns to normal operating state and accepts normal commands from the unit main control.

[0044] Example 2

[0045] A wind turbine blade anti-sweep tower system includes an independent pitch control system, a blade identification system, turbine operating condition information, a data collector, a microprocessor, and a turbine main controller;

[0046] The independent pitch control system calculates the boundary pitch angle A0 according to the operating status of the wind turbine blades, and can realize the independent pitch control of the blades;

[0047] The blade identification system uses a laser signal meter combined with a reflective strip to identify the blade passing through the pitch position P0;

[0048] The unit operating condition information includes blade angle information and wind speed information of the wind turbine blades;

[0049] The data collector collects blade angle information, blade position information and wind speed information, records the running time required for the blade to move from 0° to the boundary pitch angle AO, and transmits the information to the microprocessor;

[0050] The microprocessor: analyzes and judges the received data

[0051] The rated wind speed is WS0. When the 10-minute average wind speed exceeds (rated wind speed WS0-2) m / s, the wind turbine will enter the anti-sweep tower operation;

[0052] When the wind speed is 5m / s or above, the turbulence limit T0 is set. When the average turbulence over 20 minutes is greater than T0, the wind turbine starts to work in the anti-sweep tower.

[0053] The main controller of the unit adjusts the blade angle and receives a signal from a blade passing through the pitch position P0. The blade immediately performs independent pitch change until the boundary pitch angle A0 no longer changes pitch. The blade then resumes normal operation and accepts normal commands from the main controller of the unit.

[0054] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

Claims

1. A method for preventing a wind turbine blade from sweeping the tower, characterized in that: including Step 1: Calculate the boundary pitch angle according to the operating state of the wind turbine blade, and denote the boundary pitch angle as A0; Step 2: Calculate the running time required for the blade to move from 0° to the boundary pitch angle AO, and determine the pitch position P0 according to the running time; Step 3: Determine the blade passing through the pitch position P0 according to the pitch position P0; Step 4: Judge the anti-tower-sweeping working state of the blade passing through the pitch position P0 to obtain a judgment result; Step 5: Carry out anti-tower-sweeping work according to the judgment result.

2. The method for preventing a wind turbine blade from sweeping the tower according to claim 1, wherein: Step 3: Determine the blade passing through the pitch position P0 through a blade recognition system according to the pitch position P0.

3. The method for preventing a wind turbine blade from sweeping the tower according to claim 2, wherein: The blade recognition system is: combining a laser signal instrument and a reflective strip to determine the blade passing through the pitch position P0.

4. The method for preventing a wind turbine blade from sweeping the tower according to claim 3, wherein: The laser signal instrument receives a pulse signal at 0.1S.

5. The method for preventing a wind turbine blade from sweeping the tower according to claim 1, wherein: The judgment method for the anti-tower-sweeping working state includes: one is to determine whether to enter the anti-tower-sweeping work according to the rated wind speed, and the other is to determine whether to enter the anti-tower-sweeping work according to the average wind speed turbulence.

6. The method for preventing a wind turbine blade from sweeping the tower according to claim 5, wherein: The determination of whether to enter the anti-tower-sweeping work according to the rated wind speed is specifically: set the rated wind speed as WS0, when the 10-minute average wind speed exceeds (rated wind speed WS0 - 2) m / s, the wind turbine enters the anti-tower-sweeping work.

7. The method for preventing a wind turbine blade from sweeping the tower according to claim 5, wherein: The determination of whether to enter the anti-tower-sweeping work according to the average wind speed turbulence is specifically: in the wind speed range of 5 m / s and above, set the turbulence limit value T0, when the 20-minute average turbulence is greater than T0, the wind turbine enters the anti-tower-sweeping work.

8. The method for preventing a wind turbine blade from sweeping the tower according to claim 1, wherein: Step 5: The anti-tower-sweeping work: specifically, when the unit main controller receives the blade signal passing through the pitch position P0, the blade immediately performs independent pitching work until the boundary pitch angle A0 is reached and no further pitching occurs, and the blade resumes its normal operating state and accepts the normal command of the unit main controller.

9. A wind turbine blade anti-tower-sweeping system, based on the wind turbine blade anti-tower-sweeping method according to any one of claims 1-8, wherein: It includes an independent pitch system, a blade recognition system, unit working conditions information, a data collector, a microprocessor and a unit main controller; The independent pitch system: calculates the boundary pitch angle A0 according to the operating state of the wind turbine blade and can realize the independent pitching action of the blade; The blade recognition system: combines a laser signal instrument and a reflective strip to determine the blade passing through the pitch position P0; The unit working conditions information: includes the pitch angle information and wind speed information of the wind turbine blade; The data collector: collects the paddle angle information, blade position information, and wind speed information, records the running time required for the blade to move from 0° to the boundary pitch angle AO, and transmits it to the microprocessor; The microprocessor: analyzes and judges the received data The rated wind speed is WS0. When the 10-minute average wind speed exceeds (rated wind speed WS0 - 2) m / s, the wind turbine enters the tower sweeping prevention operation; In the wind speed range of 5 m / s and above, a turbulence limit value T0 is set. When the 20-minute average turbulence is greater than T0, the wind turbine enters the tower sweeping prevention operation; The main controller of the unit: adjusts the blade angle. When receiving the blade signal passing through the pitch position P0, the blade immediately performs independent pitch operation until the boundary pitch angle A0 is reached and no further pitch adjustment is made. Then the blade resumes normal operation and accepts the normal command of the main controller of the unit.

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