双风轮风电机组是一种新型水平轴式风电机组,可以利用前风轮尾流发电,风能利用系数高,然而为了减少前后风轮间流场干涉效应,传动链轴向跨距较单风轮机组更长,造成长跨距柔性机架多点弹性支撑下双风轮风电机组传动链模态特性复杂,潜在共振风险高。本文考虑机架柔性及其与传动链间弹性支撑,建立了双风轮风电机组传动链刚柔耦合动力学模型,分析了传动链耦合振动模式,研究了机架柔性对传动链固有特性的影响。研究结果表明：双风轮风电机组传动链前两阶扭振固有频率分别为5.63 Hz和6.01 Hz,分别对应后、前风轮传动链第一阶扭振固有频率；双风轮风电机组传动链共存在3类系统振动模式,包括前或后风轮传动链局部振动模式、前或后风轮传动链耦合振动模式以及前与后风轮传动链耦合振动模式；当系统各构件的模态能量主要集中在非扭振方向时,机架柔性会使各构件模态能量朝同侧传动链其余构件或异侧传动链构件转移。

Dual-rotor wind turbine is a new type of horizontal axis wind turbine, which can use the wake of the front wind turbine to generate electricity and has a high utilization coefficient of wind energy. However, in order to reduce the flow field interference effect between the front and the rear wind turbine, the axial span of the transmission chain is longer than that of the single wind turbine, resulting in complex transmission chain modal characteristics and high potential resonance risk under the multi-point elastic support of the long-span flexible frame. In this paper, considering the frame flexibility and elastic support between the frame and the transmission chain, a rigid-flexible coupling dynamic model of the transmission chain of dual-rotor wind turbine was established, the coupling vibration mode of the transmission chain was analyzed, and the influence of frame flexibility on the inherent characteristics of the transmission chain was studied. The results show that the first two torsional vibration natural frequencies of the wind turbine transmission chain are 5.63Hz and 6.01Hz respectively, which correspond to the first torsional vibration natural frequencies of the rear and front wind turbine transmission chains respectively. There are three vibration modes in the drive chain of dual-rotor wind turbines, including the local vibration mode of the front or rear wind turbine drive chain, the coupled vibration mode of the front or rear wind turbine drive chain and the coupled vibration mode of the front and rear wind turbine drive chain. When the modal energy of each component of the system is mainly concentrated in the non-torsional direction, the frame flexibility will make the modal energy of each component transfer to the other components of the same side drive chain or the other side drive chain components.

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国家重点研发计划(2020YFB1506600)；山西省重点研发计划项目(202102060301017)；广东省重点研发计划项目(2021B0101230002)