Calculation of Dynamic Load for Wind Turbine
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摘要: 改进了传统动量-叶素理论,提出了基于动态入流的动量-叶素理论,并应用于风力机偏航与动态变桨下的载荷计算。将Pitt-Peters方法与GDW方法应用于风力机的载荷计算中,并进行了相应的修正。载荷计算结果与NREL实测结果进行了对比分析,结果表明:基于动态入流修正的动量-叶素理论、修正Pitt-Peters方法和修正GDW方法均能够较准确评估风力机非定常流动下的载荷。进一步对某实际风力机进行了偏航与动态变桨的载荷分析,在偏航状态和动态变桨瞬间,风力机将承受较大的动态载荷,需要进行非定常流动载荷计算,以免低估风力机在实际运行过程中的动态载荷。Abstract: In this paper,traditional BEM theory is improved by considering dynamic inflow effect and then the improved BEM theory is applied to estimate wind turbine load at yawing and dynamic pitching.Pitt-Peters method and Generalized Dynamic Wake(GDW) method are also improved and applied in the calculation of wind turbine load.The comparison between calculated load and test results for real NREL wind turbine show that the improved BEM theory,improved Pitt-Peters method and improved GDW method can predict the wind turbine load very well at yawing and dynamic pitching.Furthermore,load calculation for real ZDS-2500 wind turbine also show that,at yawing and dynamic pitching the wind turbine will suffer from very high dynamic load.In order to avoid underestimation of load,load calculation for unsteady flow should be adopted.
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