海上风力机随机风场模拟及风振响应分析

来源期刊:中南大学学报(自然科学版)2016年第4期

论文作者:柯世堂 王同光 曹九发 王珑

文章页码:1245 - 1253

关键词:海上风力机;随机风场模拟;风振响应;风振系数;一致耦合法

Key words:offshore wind turbine system; stochastic wind field simulation; wind-induced response; wind vibration coefficient; consistent coupled method

摘    要:为研究海上风力机的风振特性,进行风力发电塔-轮系统的随机风场模拟和风振动力响应计算。采用谐波叠加法模拟塔架和风轮的来流风速时程,进而基于改进的叶素-动量理论(MBEM)模拟考虑风轮和塔架相干效应、风轮旋转效应的风轮脉动风速时程。结合已提出的柔性结构风振精细化频域计算方法“一致耦合法”,对海上风力发电系统结构进行风振动力响应和风振系数计算。研究结果表明:海上风力发电塔-轮系统的风振动力响应以共振效应为主,但背景响应和耦合项不能忽略,风振呈现多模态耦合和多振型响应2个显著特征;系统风振系数的分布差异较大,其中风轮尖部最大(2.35),塔架中下部位最小(1.40)。

Abstract: In order to analyze the wind-induced characteristics of offshore wind turbine system, the simulation of stochastic wind field and wind-induced responses of wind turbine tower-rotor system were finished. The fluctuating wind velocity time series was simulated by the modified harmony superposition method. The incoming fluctuating wind velocity time series of wind rotors was simulated by the harmony superposition method, then the fluctuating wind velocity time series considering the rotor rotational effect and aero-elastic effect was simulated with modified blade element momentum. Finally, using the domain calculating method “consistent coupled method”, the wind-induced responses and coefficients for the offshore wind turbine system were calculated. The results show that the resonant effect of wind-induced dynamic responses is obvious for offshore wind turbine system, and is characterized with multimode coupling effect and multiple mode of vibration responses; the wind vibration coefficients are fluctuating in different components, and the value of wind vibration in rotor top is 2.35, the middle section of tower is 1.40.

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