A method and system for controlling speed resonance frequency ride-through of flexible tower wind turbines
A technology of wind turbines and control methods, which is applied in the direction of wind engine control, engine control, and wind power generation, and can solve the problems of inconvenient practical application and excessive power generation, so as to reduce the loss of power generation, improve power generation efficiency, and reduce load Effect
Active Publication Date: 2021-08-17
ZHEJIANG WINDEY
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Problems solved by technology
The above-mentioned technical scheme loses a lot of power generation and causes a large economic loss, and the first-order resonance frequency of the tower must be accurately measured in advance, which is not convenient for practical application
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Embodiment
[0050] Embodiment: In this embodiment, a speed resonance frequency ride-through control method of a flexible tower wind turbine, as shown in figure 1 shown, including the following steps:
[0051] (1) The first-order modal frequency ω in the left and right directions of the tower in the nth control cycle obtained by the online tower mode identification system 0 (n) and damping ratio B 0 (n), the motion acceleration a in the left and right direction of the tower top in the nth control cycle obtained by the tower vibration sensor ss (n), the wind rotor speed ω of the nth control cycle measured by the encoder r (n), and the operation mode flag A of the nth control cycle, the initial value of flag A is set to 0.
[0052] (2) The acceleration a of the movement in the left and right directions of the tower top ss Perform low-pass filtering and band-pass filtering respectively to obtain the acceleration a of the left and right direction movement of the tower top after filtering ss...
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The invention discloses a method and a system for controlling the speed resonance frequency crossing of a flexible tower wind turbine. The method includes: acquiring basic calculation data; ss Process; obtain the left and right motion acceleration a of the tower top after the filter of the nth control cycle ss0 The root mean square of ; different operating states are performed according to the operating flag bit A. The system includes a tower modal online identification system, a tower vibration sensor and a speed measuring encoder, which are respectively connected with the flexible tower wind turbine rotational speed resonance frequency crossing control system, and the tower vibration sensor is evenly installed on the tower from top to bottom. The above technical scheme realizes the adaptive control of the jumping deviation value of the rotor speed, the vibration amplitude and the damping coefficient, reduces the load of the flexible tower, ensures the safety of the unit, and at the same time makes the wind turbine run in the maximum energy tracking mode most of the time, which is obvious. Reduce the loss of power generation and effectively improve the power generation efficiency of wind turbines.
Description
technical field [0001] The present invention relates to the field of wind power generation, in particular to a method and system for controlling the speed resonance frequency ride-through of a flexible tower wind turbine. Background technique [0002] Statistics show that my country's wind power has developed rapidly, and its installed capacity has ranked first in the world for eight consecutive years, making it the third largest energy source in my country. In recent years, the development of my country's wind power technology has shown a trend of longer and longer blades, larger and larger unit capacity, and higher and higher towers. As towers become higher and higher, conventional rigid towers whose first-order natural frequency is between 1P and 3P within the operating speed range can no longer meet the design requirements of high towers. More and more tall towers The frame adopts a flexible tower design, that is, within the operating speed range, the first-order natura...
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IPC IPC(8): F03D7/00
CPCF03D7/00F05B2270/101F05B2270/334Y02E10/72F03D7/0276F03D7/0296
Inventor 应有孙勇陈棋史晓鸣杨靖程晨光
Owner ZHEJIANG WINDEY