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Development of a mathematical model to design an offshore wind and wave hybrid energy system

机译：开发用于设计海上风浪混合能源系统的数学模型

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Fossil Fuels are always considered as environmental pollutants. On the other hand, the political and economic situations highly affect the price of these fuels. Offshore wind and wave, as renewable energy sources, represent the better alternatives for electricity generation. Therefore, it is necessary that wind speeds effectively be estimated due to the absence of field measurements of the wind speed above the surface of the sea in many regions. In this paper, the annual-average wind speed above the sea is calculated mathematically. Wind data obtained from onshore monitoring stations were analyzed to obtain wind power density above the sea. In addition, this study provides information on the variation of the wave energy using Beaufort scale and wind speeds. This allows an approximate estimation of energies corresponding to various wave heights in that region. Besides, a mathematical model was developed to assess wave and wind hybrid energy system. Thus, using a mathematical model, wind-wave hybrid system components were: wind turbine, wave converter and foundation. The wave energy converter (WEC) selected for the hybrid device is Wavestar prototype which was combined with a wind turbine. As for case study, the wind speed as well as the resulting wind and wave power potential in the area of Eastern Mediterranean Sea and the North Sea were determined and the assessment were done for the designed hybrid system. It can be concluded that the annual energy production from hybrid wind-wave device in the North Sea is 64.3% more than its value in the Mediterranean Sea.
机译：化石燃料一直被认为是环境污染物。另一方面，政治和经济形势严重影响了这些燃料的价格。海上风能作为可再生能源，代表了更好的发电方式。因此，由于在许多地区都没有对海面以上的风速进行现场测量，因此必须有效地估算风速。在本文中，数学计算了海上平均年风速。分析了从陆上监测站获得的风数据，以获取海上的风能密度。此外，这项研究还提供了有关使用波弗特尺度和风速的波能变化的信息。这允许近似估计与该区域中的各种波高相对应的能量。此外，建立了数学模型来评估波浪和风能混合能源系统。因此，使用数学模型，风浪混合系统的组件为：风力涡轮机，波转换器和基础。选择用于混合动力设备的波能转换器（WEC）是Wavestar原型，与风力涡轮机结合使用。对于案例研究，确定了东地中海和北海地区的风速以及由此产生的风能和波浪能，并对设计的混合系统进行了评估。可以得出的结论是，北海混合风浪装置的年能源产量比其在地中海的年产值高64.3％。

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