系泊系统对波能发电装置动力响应的影响

Effects of mooring systems on dynamic response of wave energy converter

    摘要
  • 摘要:
      目的  为了设计造价合理、性能高效的系泊系统，研究不同系泊系统对波能发电装置（WEC）的能量摄取（PTO）能力和定位性能的影响。
      方法  选择一典型的两刚体点吸式WEC装置为研究对象，采用WEC-Sim和MoorDyn开源代码设计两类系泊系统，一类采用锚链，另一类采用锚链和聚酯缆绳所组成的混合缆。通过对这两类系泊系统进行时域分析计算，获得WEC位移响应以及PTO装置响应和系缆张力响应。
      结果  结果表明：系泊系统对浮子位移响应的影响很小，但对Spar式底板的影响明显；对于针对线性阻尼型WEC，系泊系统对PTO响应的影响可以忽略不计；在工作海况下，混合缆系泊系统的张力比锚链系泊系统中同一位置处的更低。
      结论  该研究可为波能发电装置的系泊设计提供参考。

     

    Abstract:
      Objectives  Aiming at a mooring system design with cost-effectiveness and high performance for wave energy converter (WEC) , the effects of such systems on the capability of power take-off (PTO) system and positioning performance of WEC are investigated.
      Methods  A two-body floating point absorber is chosen as the sample WEC. The open-source WEC-Sim and MoorDyn codes are used to design two types of mooring system for the WEC: one is a chain mooring system and the other is an integrated chain-rope (i.e., polyester fiber rope) mooring system. By performing time-domain analysis for the WEC with different mooring lines, the responses, such as WEC displacement, power take-off (PTO) and mooring line tension, are obtained respectively.
      Results  The results show that, the effects of mooring systems on the displacement response of the floater are small, but these effects on the response of the spar body is obvious. For the WEC with a linear damper, these effects on the PTO response are negligible. Moreover, the line tensions of the integrated mooring system are lower than the corresponding tensions of the chain mooring system under the operational sea state.
      Conclusions  The results of this study have reference value for the improved design of WEC mooring systems.

     

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