高原风力机与来流湍流的多尺度结构响应关系

Multi-scale Structural Response Relationship Between Wind Turbine and Turbulent Inflow over the Plateau

为了解在高原环境下的大型风力机功率输出和来流湍流之间的尺度关系,以青藏高原环境下的大型水平轴风力机为研究对象,基于先进的激光雷达测量技术,通过现场实验的方法,在特定风速下,对机组持续运行1 h的湍流来流和输出功率间的尺度耦合关系进行研究与分析。结果表明:中尺度范围的湍流尺度时滞与对流时间的比值近似于功率的延迟时间与对流时间的比值;来流湍流的间歇性特征被传递到风力机风轮上,且因湍流强度和风剪切的增加而被放大;高频区湍流对功率无明显影响。本文的研究结果可为高原地区及其他特殊工况下风力机结构响应的研究提供参考。

In order to understand the scale relationship between the power output and the incoming turbulence of large wind turbines in the plateau environment,taking the large-scale horizontal axis wind turbine in the Qinghai-Tibet Plateau as the research object,based on the advanced LiDAR technology and through the field experiment method,the scale coupling relationship between the inflow and the output power of the wind turbine for one hour of continuous operation under specific wind speed was studied and analyzed.The results show that the ratio of turbulence scale time lag to convection time in the mesoscale range is close to the ratio of power delay time to convection time;the intermittent characteristics of inflow turbulence are transmitted to the wind turbine rotor and amplified by the increase of turbulence intensity and wind shear exponent.And Turbulence in high frequency has no obvious effect on power.It can provide reference for the study of wind turbine structural response in plateau area and other special conditions.