A method, system, medium and device for eliminating the vortex-induced vibration of fan blades

Abstract

The present invention discloses a method, system, medium and device for eliminating the vortex-induced vibration of fan blades. This method adds a strategy for eliminating vortex-induced vibration to the main control program of the fan through the PLC main controller, and can eliminate the vortex-induced vibration of the fan blades when the fan is not powered off and in a shutdown state. If the main control program detects that the fan needs to execute the strategy for eliminating vortex-induced vibration, it controls the pitch system of the fan to execute the pitch vibration elimination strategy in the strategy for eliminating vortex-induced vibration; if the pitch vibration elimination strategy fails to execute, the main control program controls the yaw system of the fan to execute the yaw vibration elimination strategy in the strategy for eliminating vortex-induced vibration, and finally successfully makes the wind speed and vibration value of the fan meet the preset conditions, eliminating the vortex-induced vibration to protect the safety of the fan blades; the present invention can control the fan to execute pitch or yaw vibration elimination actions in the non-powered-off shutdown state of the fan, so as to destroy the periodicity of vortex shedding, suppress the increase of vibration, achieve the purpose of eliminating vortex-induced vibration, and protect the safety of the fan blades.

Description

Technical Field

[0001] The present invention relates to the technical field of eliminating the vortex-induced vibration of a fan, and in particular to a method, a system, a medium and a device for eliminating the vortex-induced vibration of a fan blade. Background Art

[0002] With the increasing diameter of the impeller of modern wind turbines, the threat of vortex-induced vibration to the safety of the fan is also increasing. Most of the existing patents for suppressing or eliminating the vortex-induced vibration of a fan are aimed at the vortex-induced vibration of the fan tower, and the patents for the vortex-induced vibration of the blade only adjust the blade state or add a flow disturbance device in the non-powered state to achieve the purpose of reducing the vortex-induced vibration.

[0003] For example, in the Chinese invention patent CN112360684A, a method for suppressing the vortex-induced vibration of a fan blade is disclosed. The steps of the method include adjusting the pitch angle of the blade with reference to the load range that the fan can withstand in the non-powered state of the fan. This method can only work when the fan is in the idle state before being powered on after being hoisted, and it is impossible to achieve the purpose of suppressing or eliminating the vortex-induced vibration in the normal shutdown state after the fan is hoisted and debugged.

[0004] In the Chinese invention patent CN114033634A, a device for suppressing the vortex-induced vibration of a fan is disclosed. The device installs multiple groups of blade vortex-induced vibration suppression devices and tower vortex-induced vibration suppression devices respectively at the leading edge and trailing edge of the feathering blade and on both sides of the fan tower, in the area from the area where the blade is closest to the tower to the area where the chord length of the blade is similar to the diameter of the tower, to balance the pressure on the windward and leeward sides of the fan blade and the tower, destroy the smooth contour line of the blade and the tower, destroy the consistency of the large-scale separated vortex along the height, and disrupt the frequency and orderliness of the shedding of the large-scale separated vortex behind the blade and the tower, thereby suppressing the phenomenon of vortex-induced resonance of the blades and tower of a large wind turbine. Summary of the Invention

[0005] The first object of the present invention is to provide a method for eliminating the vortex-induced vibration of a fan blade to solve the deficiencies in the prior art. Based on the pitch and yaw systems of the fan, when the fan is in normal shutdown after being put into use and powered on, it can effectively suppress and eliminate the risk of vortex-induced vibration of the blade under special wind conditions and protect the safety of the fan blade.

[0006] The second object of the present invention is to provide a system for eliminating the vortex-induced vibration of a fan blade.

[0007] The third object of the present invention is to provide a non-transitory computer-readable medium.

[0008] The fourth object of the present invention is to provide a computing device.

[0009] The first object of the present invention is achieved by the following technical solution: A method for eliminating the vortex-induced vibration of a fan blade. This method adds a strategy for eliminating vortex-induced vibration to the main control program of the fan through a PLC main controller, which can eliminate the vortex-induced vibration of the fan blade when the fan is not powered off and in a shutdown state. If the main control program detects that the fan needs to execute the strategy for eliminating vortex-induced vibration, it controls the pitch system of the fan to execute the pitch vibration elimination strategy in the strategy for eliminating vortex-induced vibration; if the pitch vibration elimination strategy fails to execute, the main control program controls the yaw system of the fan to execute the yaw vibration elimination strategy in the strategy for eliminating vortex-induced vibration, and finally successfully makes the wind speed and vibration value of the fan meet the preset conditions, eliminating the vortex-induced vibration to protect the safety of the fan blade.

[0010] Further, when the main control program detects that the fan needs to execute the strategy for eliminating vortex-induced vibration, it controls the pitch system of the fan to execute the pitch vibration elimination strategy in the strategy for eliminating vortex-induced vibration, and specifically performs the following operations:

[0011] When the fan is in a shutdown state and not under power-off maintenance or general maintenance, the main control program needs to detect whether it meets the conditions for pitch vibration elimination to be enabled, the current wind speed is within the set wind speed range, and the effective value of the fan vibration is greater than the set threshold. If all the above conditions are met, then it is further determined whether the current fan safety chain is disconnected. If the safety chain is not disconnected, the main control program controls the fan to start executing the actions of the pitch vibration elimination strategy, that is, first opening the blades by a1 degrees at a speed of v1, and after the blade opening is completed, waiting for a time t1, and then closing the blades back to the original shutdown angle at a speed of v2; if the safety chain is disconnected, first perform a reset bypass on the fan, and after the fan returns to the shutdown state, then execute the actions of the pitch vibration elimination strategy; if the main control program still detects that the fan needs pitch vibration elimination after the actions of the pitch vibration elimination strategy are completed, repeat the above actions.

[0012] Further, when the pitch vibration elimination strategy fails to execute, the main control program controls the yaw system of the fan to execute the yaw vibration elimination strategy in the strategy for eliminating vortex-induced vibration, and specifically performs the following operations:

[0013] When the main control program detects that the pitch vibration elimination cannot work properly, that is, the actions of the pitch vibration elimination strategy fail to execute, or when the yaw vibration elimination is manually turned on and the switch of the pitch vibration elimination automatically closes, the main control program switches to execute the actions of the yaw vibration elimination strategy. The main control program needs to detect whether the current wind speed is within the set wind speed range and the effective value of the fan vibration is greater than the set threshold. If both of the above conditions are met, then the yaw direction is determined according to the current cable-twisting angle of the fan. First, yaw by b1 degrees in one direction. After the yaw is completed, wait for a time t2, and determine whether the vibration value of the fan at this time is less than the set threshold. If the vibration value of the fan is less than the set threshold, then exit the yaw vibration elimination action; otherwise, yaw by 2*b1 degrees in the other direction; if the main control program still detects that the fan needs yaw vibration elimination after the above yaw vibration elimination actions are completed, repeat the above actions.

[0014] The second object of the present invention is achieved by the following technical solution: An anti-vortex-induced vibration system for a fan blade, comprising:

[0015] A PLC main controller module for importing an anti-vortex-induced vibration strategy;

[0016] A pitch control module for controlling the pitch action of the fan;

[0017] A pitch vibration damping module for eliminating the vortex-induced vibration of the fan blade by controlling the pitch control module;

[0018] A yaw drive module for controlling the yaw action of the fan;

[0019] A yaw vibration damping module for eliminating the vortex-induced vibration of the fan blade by controlling the yaw drive module;

[0020] A vibration sensor module for monitoring the vibration value of the fan;

[0021] A wind speed and direction monitoring module for monitoring the real-time wind speed of the fan;

[0022] A yaw position encoder module for controlling the yaw direction of the fan.

[0023] The third object of the present invention is achieved by the following technical solution: A non-transitory computer-readable medium storing instructions, when the instructions are executed by a processor, performing the steps of the method for eliminating vortex-induced vibration of a fan blade according to the above.

[0024] The fourth object of the present invention is achieved by the following technical solution: A computing device, comprising a processor and a memory for storing a program executable by the processor, when the processor executes the program stored in the memory, implementing the method for eliminating vortex-induced vibration of a fan blade according to the above.

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0026] After the fan is debugged and put into use, the present invention adds an anti-vortex-induced vibration strategy to the main control program of the fan. Based on the pitch system and yaw system of the fan, the required relevant signals already exist in the fan itself, and no additional hardware needs to be added; at the same time, when it is detected that there may be a risk of vortex-induced vibration in the non-powered-off shutdown state of the fan, the fan can be controlled to perform pitch or yaw vibration damping actions to destroy the periodicity of the original vortex shedding, thereby suppressing the increase of vibration and achieving the purpose of eliminating vortex-induced vibration and protecting the safety of the fan blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a flowchart of the pitch vibration damping strategy.

[0028] Figure 2 It is a flowchart of the yaw vibration elimination strategy. Specific implementation mode

[0029] The present invention will be further described below in conjunction with specific embodiments.

[0030] Embodiment 1

[0031] See Figures 1 to 2 As shown, it is a method for eliminating the vortex-induced vibration of the fan blades provided in this embodiment. This method adds a vortex-induced vibration elimination strategy to the main control program of the fan through the PLC main controller, and can eliminate the vortex-induced vibration of the fan blades for a fan that is not powered off and in a shutdown state. If the main control program detects that the fan needs to execute the vortex-induced vibration elimination strategy, it controls the pitch system of the fan to execute the pitch vibration elimination strategy in the vortex-induced vibration elimination strategy; if the pitch vibration elimination strategy fails to execute, the main control program controls the yaw system of the fan to execute the yaw vibration elimination strategy in the vortex-induced vibration elimination strategy, and finally successfully makes the wind speed and vibration value of the fan meet the preset conditions, eliminating the vortex-induced vibration to protect the safety of the fan blades. The specific operations are as follows:

[0032] When the fan is in a shutdown state and not under power-off maintenance or non-maintenance, the main control program needs to detect whether it meets the conditions for pitch vibration elimination start, the current wind speed is within the set wind speed range, and the effective value of the fan vibration is greater than the set threshold. If all the above conditions are met, then it is judged whether the current fan safety chain is disconnected. If the safety chain is not disconnected, the main control program controls the fan to start executing the actions of the pitch vibration elimination strategy, that is, first open the blades at a speed of v1 by an angle of a1. After the blade opening is completed, wait for a time t1, and then retract the blades at a speed of v2 to the original shutdown angle; if the safety chain is disconnected, first perform a reset bypass on the fan. After the fan returns to the shutdown state, then execute the actions of the pitch vibration elimination strategy; if the main control program still detects that the fan needs pitch vibration elimination after the actions of the pitch vibration elimination strategy are completed, repeat the above actions; among them, v1 and v2 do not exceed the normal pitch speed of the fan, and the range of v1 and v2 is from 0 degrees per second to 4 degrees per second. The waiting time t1 ranges from 30 seconds to 2 minutes. The blade opening angle a1 needs to satisfy that the fan impeller can rotate when there is a strong wind after blade opening, but the rotation speed cannot be too fast. Therefore, during the test, a1 is between 1 degree and 10 degrees;

[0033] When the main control program detects that the pitch anti-vibration cannot work properly, that is, the action execution of the pitch anti-vibration strategy fails, or when the yaw anti-vibration is manually turned on, the switch of the pitch anti-vibration automatically closes, then the main control program switches to execute the action of the yaw anti-vibration strategy. The main control program needs to detect whether the current wind speed is within the set wind speed range and the effective value of the fan vibration is greater than the set threshold. If the above conditions are met, the yaw direction is judged according to the current cable-twisting angle of the fan. First, yaw b1 degrees in one direction. After the yaw is completed, wait for time t2, and judge whether the vibration value of the fan at this time is less than the set threshold. If the vibration value of the fan is less than the set threshold, then exit the yaw anti-vibration action, otherwise yaw 2*b1 degrees in the other direction; if the main control program still detects that the fan needs to perform yaw anti-vibration after the above yaw anti-vibration action is completed, repeat the above action; among them, the range of the yaw angle b1 is between 10 degrees and 30 degrees, and the waiting time t2 after the first yaw ranges between 30 seconds and 2 minutes.

[0034] Embodiment 2

[0035] This embodiment discloses a system for eliminating the vortex-induced vibration of the fan blades, including:

[0036] The PLC main controller module is used to import the strategy for eliminating vortex-induced vibration;

[0037] The pitch module is used to control the pitch action of the fan;

[0038] The pitch anti-vibration module is used to eliminate the vortex-induced vibration of the fan blades by controlling the pitch module;

[0039] The yaw drive module is used to control the yaw action of the fan;

[0040] The yaw anti-vibration module is used to eliminate the vortex-induced vibration of the fan blades by controlling the yaw drive module;

[0041] The vibration sensor module is used to monitor the vibration value of the fan;

[0042] The wind speed and direction monitoring module is used to monitor the real-time wind speed of the fan;

[0043] The yaw position encoder module is used to control the yaw direction of the fan.

[0044] Embodiment 3

[0045] This embodiment discloses a non-transitory computer-readable medium storing instructions, which when executed by a processor, execute the steps of the method for eliminating the vortex-induced vibration of the fan blades according to Embodiment 1.

[0046] The non-transitory computer-readable medium in this embodiment may be a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), a USB flash drive, a portable hard disk, or other such media.

[0047] Embodiment 4

[0048] This embodiment discloses a computing device, including a processor and a memory for storing processor-executable programs. When the processor executes the programs stored in the memory, the method for eliminating the vortex-induced vibration of the fan blades described in Embodiment 1 is implemented.

[0049] The computing device described in this embodiment may be a desktop computer, a laptop computer, a smart phone, a PDA handheld terminal, a tablet computer, a programmable logic controller (PLC), or other terminal devices with processor functions.

[0050] The above-described embodiments are only the preferred embodiments of the present invention, and do not limit the scope of implementation of the present invention. Therefore, all changes made according to the shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for eliminating the vortex-induced vibration of fan blades, characterized in that: This method adds a strategy to eliminate vortex-induced vibration in the main control program of the fan through the PLC main controller, which can eliminate the blade vortex-induced vibration of the fan that is not powered off and in a shutdown state. If the main control program detects that the fan needs to execute the strategy to eliminate vortex-induced vibration, it controls the pitch system of the fan to execute the pitch vibration elimination strategy in the strategy to eliminate vortex-induced vibration. The specific operations are as follows: When the fan is in a shutdown state and not under power-off maintenance or regular maintenance, the main control program needs to detect whether it meets the conditions for pitch vibration elimination to start, the current wind speed is within the set wind speed range, and the effective value of the fan vibration is greater than the set threshold. If all the above conditions are met, then it is further determined whether the current safety chain of the fan is disconnected. If the safety chain is not disconnected, the main control program controls the fan to start executing the actions of the pitch vibration elimination strategy, that is, first open the blades by a1 degrees at a speed of v1. After the blade opening is completed, wait for a time t1, and then retract the blades to the original shutdown angle at a speed of v2; if the safety chain is disconnected, first perform a reset bypass on the fan. After the fan returns to the shutdown state, then execute the actions of the pitch vibration elimination strategy; If the main control program still detects that the fan needs pitch vibration elimination after the actions of the pitch vibration elimination strategy are completed, repeat the above actions; if the execution of the pitch vibration elimination strategy fails, the main control program controls the yaw system of the fan to execute the yaw vibration elimination strategy in the strategy to eliminate vortex-induced vibration. The specific operations are as follows: When the main control program detects that pitch vibration elimination cannot work properly, that is, the actions of the pitch vibration elimination strategy are executed failed, or when yaw vibration elimination is manually turned on and the switch of pitch vibration elimination is automatically turned off, the main control program switches to execute the actions of the yaw vibration elimination strategy. The main control program needs to detect whether the current wind speed is within the set wind speed range and the effective value of the fan vibration is greater than the set threshold. If the above conditions are all met, then determine the yaw direction according to the current cable-twisting angle of the fan. First, yaw b1 degrees in one direction. After the yaw is completed, wait for a time t2, and determine whether the vibration value of the fan at this time is less than the set threshold. If the vibration value of the fan is less than the set threshold, then exit the yaw vibration elimination action; otherwise, yaw 2 * b1 degrees in the other direction; if the main control program still detects that the fan needs yaw vibration elimination after the above yaw vibration elimination actions are completed, repeat the above actions; Finally, it successfully makes the wind speed and vibration value of the fan meet the preset conditions, eliminates vortex-induced vibration to protect the safety of the fan blades.

2. A system for eliminating the vortex-induced vibration of fan blades, characterized in that, For implementing the method for eliminating vortex-induced vibration of fan blades described in claim 1, it includes: A PLC main controller module for importing the strategy to eliminate vortex-induced vibration; A pitch module for controlling the pitch action of the fan; A pitch vibration elimination module for eliminating the vortex-induced vibration of the fan blades by controlling the pitch module; A yaw drive module for controlling the yaw action of the fan; A yaw vibration elimination module for eliminating the vortex-induced vibration of the fan blades by controlling the yaw drive module; A vibration sensor module for monitoring the vibration value of the fan; A wind speed and direction monitoring module for monitoring the real-time wind speed of the fan; A yaw position encoder module for controlling the yaw direction of the fan.

3. A non-transitory computer-readable medium storing instructions, characterized in that, When the instruction is executed by the processor, it executes the steps of the method for eliminating vortex-induced vibration of fan blades described in claim 1.

4. A computing device, comprising a processor and a memory for storing processor-executable programs, characterized in that, When the processor executes the program stored in the memory, the method for eliminating the vortex-induced vibration of the fan blade described in claim 1 is implemented.

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