Wind mill leeway control method based on wind vane and output power

Abstract

The invention relates to a drift control method of wind mill based on wind vane and output power. When the absolute wind change value is higher than 15degree, the invention uses wind vane control method, and when the absolute wind change value is not higher than 15degree, the invention uses power control method. Since the wind direction and speed changes will change the output power of generator, the power checker can check the output power of motor, the invention only processes drift control when the wind direction changes, while the wind change is used as interference signal on the power control method. The power control method is divided into anti-clockwise rotation, clockwise rotation, and original position stop conditions. The invention can shorten the align time, improve accuracy and energy utilization.

Description

Technical field [0001] The invention relates to a control method in the technical field of wind power generation, in particular to a wind turbine yaw control method based on a wind vane and output power. Background technique [0002] Wind energy is a kind of renewable energy. In recent years, the development and utilization of wind energy has received extensive attention. But wind is a kind of vector and has randomness. Whether it is wind direction or wind speed, it is always changing. It is required to control the yaw control system of the wind turbine to ensure that the wind turbine nacelle is always facing the wind and improve the efficiency of wind energy utilization and wind turbines. life. [0003] In the prior art, some people propose to adopt a passive upwind yaw system, which is controlled by the tail rudder of a wind turbine, and adopts a passive counterwind mode when the wind direction changes. It is mostly used for small, independent, non-grid-connected wind turbines....

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Problems solved by technology

[0004] Found through literature search to prior art, Farret et al. in "Proc.of The 27th Annual Conference of the IEEE" (the 27th Annual Conference Proceedings of the Institute of Electrical and Electronics Engineers of America) (2001, Volume 2, No. 1370-- 1375 pages) on "Sensorless active yaw control forwind turbines" (wind turbine speedless active yaw control), this paper proposes a HILL CLIMBING (blind man climbing) control method that does not use wind direction sensors, the specific method is: based on The principle of finding the maximum value of the function is to detect the output power of the generator and control the steering of the yaw motor according to the change of the output power to find the maximum output power point, but this method is only applicable to small, independent non-grid-connected types Wind Turbine

In the search, it was also found that Kung Chris Wu et al. in "Proceedings of The FirstIEEE Regional Conference on Aerospace Control Systems" (Proceedings of the First IEEE Regional Conference on Aerospace Control Systems) (May 25-27, 1993, No. 254 -258 pages) published "Evaluation of Classical and Fuzzy Logic Controllers for Wind Turbine Yaw Control" (analysis and comparison of typical and fuzzy controllers for wind turbine yaw control), in which it is proposed that for large-scale grid-connected wind turbines, active wind yaw The navigation system actively controls the wind according to the wind direction signal measured by the wind direction sensor located in the downwind direction, and adopts control methods such as PI (proportional integral), fuzzy and optimal control. Signal, to implement yaw-to-wind control on the wind turbine, the disadvantage is that the yaw control signal of the yaw controller comes from the wind direction sensor, and the sensor is placed in the downwind direction, which is often easily affected by turbulence, etc., and the measurement accuracy is not high. Unsatisfactory yaw control effect

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