Lidar-assisted feedforward wind measurement individual pitch control method of wind generating set

Abstract

The invention discloses a lidar-assisted feedforward wind measurement individual pitch control method of a wind generating set. According to the method, a telescope is mounted on each blade for observing the incoming flow wind speed, and the telescopes are connected with a laser radar system in a hub through optical fibers to form a telescope radar system; the wind speed u<h,est,i> parallel to theaxis of the hub is estimated to be obtained through a measurement result of the telescope radar system and is used as the control feedforward input quantity for compensating impeller aerodynamic unbalanced load caused by wind shear and yaw errors; and according to the estimated wind speeds of the three blades parallel to the axis of the hub, Park transformation or Coleman transformation is carried out on the wind speeds to obtain orthogonal double components of a wind speed field, a pitch action field is obtained from the double components of the wind speed field through a double-input and double-output controller, two orthogonal blade angles of the pitch action field are subjected to Park inverse transformation to finally obtain independent blade angle disturbance quantities of the threeblades, and the independent blade angle disturbance quantities are sent to a variable pitch execution mechanism to be executed. According to the method, the hardware reliability is guaranteed, and the superiority of laser radar feedforward control is also exerted.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to an independent pitch control method for a wind power generating set based on laser radar feed-forward wind measurement. Background technique [0002] Judging from the current development trend of wind power technology, wind turbines are more inclined to develop in the direction of large megawatts, high towers, large impellers and lightweight, especially the current offshore units. For a large impeller unit, turbulence, wind shear effect, tower shadow effect and yaw error will cause uneven force on the impeller plane, thus making the fatigue load My of the blade root, the unbalanced load of the hub and yaw system (Myz) Significantly increase and restrict its development; Lidar-assisted IPC technology based on lidar feedforward wind measurement can reduce the unbalanced load of the impeller; independent pitch technology is currently mainly based on blade root load or ...

AI Technical Summary

Problems solved by technology

For a large impeller unit, turbulence, wind shear effect, tower shadow effect and yaw error will cause uneven force on the impeller plane, thus making the fatigue load My of the blade root, the unbalanced load of the hub and yaw system (Myz) Significantly increase and restrict its development; Lidar-assisted IPC technology based on lidar feedforward wind measurement can reduce the unbalanced load of the impeller; independent pitch technology is currently mainly based on blade root load or tower top load Feedback of the control, but the reliability of the load sensor and the real-time nature of the feedback have always troubled technicians

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