考虑二阶波浪荷载效应的海上TLP浮式风机分析

Analysis on the TLP Floating Offshore Wind Turbine Considering the Effect of Second Order Wave Load

基于多数专业风机数值模拟软件只可进行一阶波浪荷载计算这一缺点,文中将以AQWA为基础,利用其可进行二次开发的技术优势,通过实时调用风机气动荷载,实现海上TLP浮式风机分析。分析中,浮式风机平台一阶、二阶波浪荷载由AQWA计算,实时调用的气动荷载由动态链接库提供。该动态链接库主要包含了根据叶素动量定理自行编译的气动荷载计算程序。经过与FAST比较,得知该方法能满足分析需求。垂荡、纵摇力的二阶效应尤为明显。仅计算浮式风机平台波浪荷载时,可以不考虑风荷载的影响,但必须考虑平台运动的影响,波浪荷载主要受纵荡、纵摇运动影响,几乎不受垂荡运动的影响;当研究浮式风机平台运动时,必须考虑风荷载和二阶波浪荷载的影响,二阶波浪荷载使得平台响应在整个频率范围内都明显增大。张力筋腱张力受二阶波浪荷载的作用更明显。

For the most professional wind turbine numerical simulation software, it has the disadvantage that only the first order wave load can be calculated. This paper is based on AQWA and takes advantage of its technical advantages for secondary development, by invoking the aerodynamic load in a real-time way, before the analysis of TLP floating offshore wind turbine is realized. In the analysis, the first order and second order wave loads of the floating offshore wind turbine platform calculated by AQWA, and the aerodynamic load in real-time invocation are provided by the dynamic link library, which mainly contains the aerodynamic load calculation program compiled by the blade element momentum. Through comparison with FAST, it is known that the method can meet the requirement of analysis. The second order effects of surge and pitch forces are especially obvious.Only the wave load of the floating wind turbine platform is calculated, and the influence of aerodynamic load can be ignored, but the influence of the platform motion must be considered. The wave load is mainly affected by surge and pitch, and is almost unaffected of heave. When studying the platform motion, the influence of wind load and second order wave load must be given full consideration,the second order wave load makes the platform motion increase obviously in the whole frequency range. The tension of tendons is more obviously affected by second-order wave loads.