Atmospheric stability has a significant influence on the power of wind turbines, however this influence has been not well studied in complex terrain. Here, through the analysis of operation data and field measurement data in a wind farm over complex terrain, the influence of atmospheric stability on wind turbine power through wind speedup factor, turbulence intensity and wind shear exponent is quantitatively studied. Affected by the terrain, the hub-height wind speed measured at an upstream mast has changed before the wind turbine, and the nacelle wind speed is used to calculate the inflow wind speed of the wind turbine through the nacelle transfer function. Results show that the difference between the wind speedup factors under non-neutral and neutral conditions is positively correlated with the topography effect under neutral conditions, and every 1% change in the inflow wind speed due to different wind speedup factors can cause a 3% change in power. Besides, for a given inflow wind speed, the wind turbine power is maximum under neutral conditions, slightly reduced under stable conditions and has a significant decrease by 8% under unstable conditions. The decrease in power under non-neutral conditions could be because the control system parameters of the wind turbine maximum power point tracking are calibrated according to neutral conditions.
|Journal||Gongcheng Rewuli Xuebao|
|Number of pages||10|
|Publication status||Published - 2021|