漂浮式风-浪能混合利用系统运动模型数值分析

Numerical modeling of floating wind-wave energy hybrid utilization system

风浪能混合发电技术具备可提高平台利用效率、增加并稳定发电量和减小发电成本的特点。本文以STC型漂浮式风浪能混合利用系统为例,建立并求解风浪能混合利用系统的非线性联合运动方程组,分析风浪能混合利用系统的波浪载荷、风载荷。计算风浪能混合利用系统的运动响应,并将数值计算的结果与已有的试验数据进行比较,验证了风浪能混合利用系统数学运动模型的准确性和适用性。应用该数学运动模型分析PTO(power takeoff)参数BPTO对波能装置发电性能的影响。在一定范围内,增加BPTO使俘获宽度比曲线带宽变小,且俘获宽度峰值对应入射波频率向低频区转移。

Combining wind turbine system and wave energy converter （WEC） is a new trend which will be cost ef- fective and lead to an overall improvement on power performance. In this paper, the Spar-Torus Combination （STC） type floating wind-wave energy hybrid utilization system is studied. A MATLAB program was built to analyze the wave load and wind load of the hybrid system. The motion response of the hybrid system was calculated and the result was compared with the experimental data that had been gotten. The accuracy and adaptability of the numerical model for the hybrid system were validated. Then this numerical method was used to study the effect of WEC＇s power take-off system on its power performance. As the PTO coefficient increased, the peak frequency of capture width ratio curve decreased, and the corresponding incident wave frequency turned to low-frequency area.