Post Assessment Method of Wind Farms’ Performance Based on Terrain and Wake Effect

There are some inefficient turbines in active wind farms, which affect the performance and normal benefits of wind farms. In view of the above problems, a wind farm post assessment was proposed, in which the low-efficiency turbines are defined and determined with the low efficacy factors been analyzed. The proposed method was applied in the actual wind farm in Hebbei. First of all, the low-efficiency turbines are determined based on the wind speed and power generation. The data shows that there are 3 low-efficiency turbines out of the 19 turbines in the wind farm. Then, the wind shear formula is used to calculate the converted wind speed of each turbine, and the relative error between the converted wind speed and the measured wind speed is judged to be consistent with the relative height of the turbine and the wind tower. The results show that two inefficient turbines are affected by the wake. Finally, the wake model was used to verify the two turbines, and the calculated values were in good agreement with the measured values, proving the effectiveness of the method. This study can provide a certain post-field evaluation for in-service wind farms and provide guidance for the operation and maintenance strategies of wind farms.