Research On Yaw And Pitch Control Strategy Of Wind Turbine In Complex Terrain With Low Wind Speed

With the gradual saturation of wind energy development in coastal and western high wind speed areas,people have gradually begun to use wind resources in low wind speed areas.The Guizhou area is a low wind speed area,affected by the complex topography,the wind conditions change frequently and the range of changes is large.If the traditional high wind speed zone yaw and pitch control strategy is applied in Guizhou area,frequent yaw will easily occur and stable operation will not be possible.Therefore,it is necessary to study a yaw and pitch control strategy suitable for Guizhou area.This article first establishes a suitable wind forecast model based on the characteristics of the wind conditions in Guizhou.Analyze the wind data in Guizhou area,and get the characteristics of wind conditions in Guizhou and the distribution of wind speed and wind direction.Combine singular spectrum analysis(SSA)and long short-term memory(LSTM)into a hybrid model for wind speed prediction in low wind speed areas in Guizhou.Compared with traditional LSTM and BP prediction algorithms,the accuracy has been significantly improved;after a sine and cosine component prediction The method of revising and restoring the wind direction to ensure the continuity of the wind direction at 0 degrees and 360 degrees;for the variable wind direction,it is proposed to add clustering to the SSALSTM hybrid model.The simulation shows that compared to the SSA-LSTM,the SSAclustering-LSTM model The overall wind direction forecast error has dropped by about 20%.Based on the forecast of wind conditions,a set of combined yaw and pitch control strategies suitable for Guizhou wind conditions are proposed.The wind turbine energy acquisition model was established based on aerodynamics;a yaw control strategy based on predicted wind conditions was proposed,the core criterion of which was the time required for yaw and the energy acquisition situation;the wind turbine model was established and the low wind speed area was simulated in ANSYS The yaw and pitch move at the same time.The simulation shows that the yaw and pitch move are performed at the same time under complex wind conditions.In the wind speed zone,the yaw and pitch action are often carried out at the same time,which affects the life of the wind turbine.A pitch control strategy that staggers the yaw action is proposed.The proposed yaw and pitch control strategy is simulated using wind data from a certain place in Guizhou.The results show that the wind turbine energy gain is significantly higher than the traditional yaw pitch control strategy,and there is basically no stopping condition around the cable.Finally,the optimal low wind speed yaw and pitch joint control strategy and its adaptability to other different wind conditions in Guizhou are studied.Based on the proposed yaw and pitch control strategy,the influence of each parameter in the strategy on the wind turbine is analyzed through orthogonal experiments,and the optimal coordinated control strategy is obtained.The optimized control strategy is simulated using data from different wind conditions in other regions of Guizhou.The results show that the proposed low wind speed yaw and pitch coordinated control strategy can better adapt to different low wind speed wind conditions in Guizhou,and the wind conditions fluctuate.Energy gains in larger areas are significantly higher than traditional control strategies,and there is no significant advantage in areas where wind conditions are less fluctuating.