微型山坡地形对风电场性能的影响研究

Study of the Effect of Micro-Hillside Topography on Wind Farm Performance

为探究微型山坡对风电场性能的影响,本文以NREL 5MW水平轴风力机为研究对象,对比分析了其在平原和微型山坡地形下串列风场的流动特性。同时探究微型山坡与下游风力机(HAWT2)相对距离(L)以及山坡坡度(θ)对风场功率输出的影响。结果表明,山坡的迎风面能够将风电场底部高速气流引入上游风力机的尾流中,有利于提高HAWT2的输出功率;HAWT2的输出功率随着L增加先减小后增大,L为6D时HAWT2的输出功率增长最高,比平原地形高70.3%,总功率提高20.02%;θ在30˚~75˚范围内,HAWT2的输出功率随着θ的增加先增大后减小,当θ = 60˚时风电场总输出功率达到最高。

In order to investigate the effect of micro hillsides on wind farm performance, this paper compares the flow characteristics of tandem wind farms with NREL 5MW HAWT in plain and micro hillside terrain. The effects of the relative distance (L) between the micro hillside and the downstream wind turbine (HAWT2) and the slope of the hillside (θ) on the power output of the wind farm are also in-vestigated. The results show that the windward side of the hillside can introduce the high-speed airflow at the bottom of the wind farm into the wake of the upstream wind turbine, which is condu-cive to increasing the output power of HAWT2. The output power of HAWT2 first decreases and then increases as L increases, and the output power of HAWT2 is the largest when L is 6D, which is 70.3% higher than that of the plain terrain, and the total power increases by 20.02%. When θ is in the range of 30˚~75˚, the output power of HAWT2 increases and then decreases as θ increases, and the total output power of the wind farm reaches the highest when θ = 60˚.