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Control method and module for solving second-order front-back vibration of wind generating set tower

A wind power generation unit, front and rear vibration technology, applied in the direction of wind power engine control, wind power engine monitoring, wind power engine, etc., can solve problems such as the vibration effect is not obvious, to improve the competitiveness of the unit, reduce the load of the unit, and save costs Effect

Active Publication Date: 2021-08-31
GUANGDONG MINGYANG WIND POWER IND GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This scheme has a good effect on the front and rear vibrations of the first-order tower, but the vibration effect is not obvious for the vibration that is dominated by the second-order front and rear modes of the tower

Method used

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  • Control method and module for solving second-order front-back vibration of wind generating set tower
  • Control method and module for solving second-order front-back vibration of wind generating set tower
  • Control method and module for solving second-order front-back vibration of wind generating set tower

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] First, we analyzed the force of the wind turbine:

[0088] Due to the impact of gravity, wind shear, turbulence, yaw error and updraft on the blades of the impeller, the unbalanced force on the three blades causes the fluctuating resultant force and bending moment on the top of the tower, causing the tower to vibrate, especially not The balanced overturning moment in the fore-aft direction will intensify the second-order modal vibration of the tower, and the second-order mode has a great influence on the vibration of the middle section of the tower. The second-order modal formation is as follows figure 1 As shown, it shows that the acceleration in the middle section of the tower is large and the two ends are small. Based on the front and rear vibration acceleration of the middle section of the tower, combined with the IPC control strategy based on the azimuth angle, the overturning bending moment acting on the front and rear directions of the tower is generated to offset...

Embodiment 2

[0125] See image 3 As shown, the conventional controller of the wind turbine consists of two parts: the torque controller and the pitch controller: the torque controller works when the wind speed is below the rated wind speed, and is used to capture the maximum wind energy; the pitch controller is used when the wind speed is above the rated wind speed , by adjusting the pitch angle to keep the generator speed near the rated speed, to ensure the normal operation of the unit and to ensure that the output power of the unit is at the rated power. Considering the current long blades, high towers, especially the upper end of the tower of offshore wind turbines is affected by wind, wake, etc., the lower end is affected by ocean currents and waves, etc., and the natural frequency of the tower is reduced, the tower vibration problem is relatively large. It is more serious than the land-based unit, especially the second-order forward and backward vibration of the tower is more serious....

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PUM

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Abstract

The invention discloses a control method and module for solving second-order front-back vibration of a wind generating set tower. The control method comprises the steps of analyzing a second-order modal formation based on the front-back acceleration of the middle section of the tower and the azimuth angle of an impeller, adopting a P controller, on a variable pitch rate instruction output by a conventional variable pitch controller, superposing different dynamic variable pitch rates on three blades correspondingly, and carrying out amplitude limiting to obtain the final variable pitch rate value of each blade; and then obtaining the final pitch angle set value of each blade through calculation, namely increasing or decreasing the pitch angle through fine adjustment according to different azimuth angles of the blades. The stress imbalance of the blades is reduced, finally, the purpose of reducing the front-back vibration of the tower at the second-order frequency point is achieved, and safe and stable operation of a wind generating set is guaranteed.

Description

technical field [0001] The invention relates to the technical field of wind power generators, in particular to a control method and module for solving the second-order front and rear vibration of a tower of a wind power generator. Background technique [0002] With the development of wind power generation technology and the demand of the market to reduce the cost of electricity, the capacity of wind turbines is getting bigger and bigger, the blades are getting longer and the towers are getting higher and higher, and due to the abundant offshore resources and stable wind speed, the economic Developed, with a large demand for electricity, it can solve the consumption problem by itself and improve the utilization rate of wind power energy. Therefore, offshore wind power will usher in rapid development. [0003] However, whether it is an onshore unit or an offshore unit, tower vibration is a difficult problem. In particular, the foundation of offshore wind turbines stands on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D7/02F03D17/00F03D13/20F03D1/06
CPCF03D7/022F03D7/0224F03D7/0204F03D7/0296F03D17/00F03D13/20F03D1/0675F05B2270/329F05B2270/328Y02E10/728Y02E10/72
Inventor 周玲任永王超
Owner GUANGDONG MINGYANG WIND POWER IND GRP CO LTD