Effect of power limited above cut out wind speed on MW wind turbines

LIU Xiaohui, GENG Lihong, CAO shengping, LI Chengchen, CHENG Linzhi

（Xuchang XJ Group Wind Power Technology Company, Xuchang 461000, China）

Abstract: Aiming at the problem that the wind turbines loads would be increased when the cut out wind speed was increased to improve the energy production, the theoretical calculation based on blade element momentum and inertia law about components loads of the turbine were conducted, a method of power limited above cut out wind speed was proposed, the power limited simulation test research on a 2 MW wind turbine of a company based on BLADED software was performed, using the NWP and NTM wind model as the simulation external condition. The results indicate that this method can improve the theoretical annual energy production about 0.76%, and the fatigue loads increase with the increasing output power, while the ultimate loads show the different changing trends, which consistent with the theoretical calculation. The results can provide some reference for the envelope loads calculation and cut out wind speed setting.

Key words: wind turbine; power limited; cut out wind speed; loads; energy production