海上风电机组塔架基础一体化设计

  [目的]  随着国家对于海上风电竞价上网指导意见的出台，降低开发成本的需求越来越迫切，急需通过技术创新降低成本。而海上塔架和基础的成本，显著影响着海上风电的平准化度电成本LCoE(Levelized Cost of Energy)，直接决定着海上风电项目的竞争力。  [方法]  为了有效降低塔架基础的成本，文章提出了基于数字化云平台iDO(integrated Design Offshore)的一体化设计方法，对极端极限状态ULS工况下结构的静强度、疲劳极限状态FLS工况下结构的疲劳损伤进行了数值计算分析。为验证一体化设计方法在降低海上风电塔架基础成本的效果，文章针对两个实际工程项目，基于iDO云平台和传统分步迭代法SIA(Sequentially Iterated Approach)进行设计分析，对比ULS工况和FLS工况下的结构安全衡准指标。  [结果]  计算结果表明:ULS和FLS工况下，基于iDO云平台的一体化设计方法比SIA在结构强度、变形、疲劳损伤等指标有较大幅度下降，可显著优化塔架基础结构，降低结构重量，减小整个支撑结构成本，降低海上风电的LCoE。  [结论]  在实际海上风电工程项目应用中，基于iDO云平台的一体化设计方法可有效降低塔架基础结构成本，从而提高海上风电项目的竞争力，同时可对未来海上风电支撑结构优化设计提供借鉴。

Integrated Design of Offshore Wind Tower and Foundation

  [Introduction]  With the “Guidance for bidding of the wind power farm development ” having been published, the demand of reducing the development cost is more and more urgent. Therefore, it is crucial to reduce the cost through technological innovantion. The cost of tower and foundation significantly affects the Levelized Cost of Energy(LCoE) of offshore wind and directly determines the competitiveness of offshore wind developer.  [Method]  This paper aims at applying an integrated Design Offshore (iDO) approach based on a digital cloud platform for an offshore wind turbine tower and foundation design in the ULS and the FLS conditions, respectively. To show the effectiveness of the iDO approach in reducing the cost of the tower and foundation, a sequentially iterated approach (SIA) was also used for a comparison using two of our offshore wind power projects.  [Result]  The results we obtained demonstrate that the design loads are all much smaller by using the iDO approach than the SIA approach in both ULS and FLS conditions. Our calculation results suggest that the iDO approach can significantly optimize the design process and reduce the weight and cost of the supporting structures, as well as the LCoE of offshore wind farm.  [Conclusion]  In the practical engineering projects of offshore wind farms, the iDO approach can significantly reduce the integrated tower & foundation cost and enhance project competitiveness. This work also provides some guidance for further study on the supporting structures design optimization by applying the iDO approach.