Abstract This paper aims to maximize the performance of a U-type Oscillating Water Column power plant integrated into a breakwater to be built in Roccella Jonica, Mediterranean Sea, Italy. In this location, both prevalent mild waves and less frequent highly energetic sea states occur. The main challenge is to select a Power Take-Off (PTO) system able to operate with high-efficiency in this wave climate without the need of turning the power plant off for safety reasons. A non-linear time-domain wave-to wire model was developed to evaluate the performance of the Roccella Jonica power plant. Capture width ratio results for single and multi-stage Wells turbines were compared with the biradial turbine. The possibility to install a single turbine on combined air chambers was also considered to reduce the overall PTO costs. The rotational speed of the biradial turbine was found to only rarely exceed the maximum allowed limit during the most energetic sea states, while the Wells turbines too often exceeded that limit. The introduction of relief valves was found to be necessary to keep the PTO rotational speed within safety limits. Optimal turbine diameter, generator rated power and multi-chamber configuration were selected by maximizing the performance of the power plant.

中文翻译：

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地中海固定式U-OWC波浪发电厂的取力器选择：以Roccella Jonica为例

摘要 本文旨在最大限度地提高将在意大利地中海 Roccella Jonica 建造的防波堤中集成的 U 型振荡水柱发电厂的性能。在这个位置，既有普遍的温和海浪，也有不太频繁的高能量海况。主要挑战是选择一种能够在这种波浪气候下高效运行而无需出于安全原因关闭发电厂的取力器 (PTO) 系统。开发了非线性时域波对线模型来评估 Roccella Jonica 发电厂的性能。将单级和多级井涡轮机的捕获宽度比结果与双径向涡轮机进行了比较。还考虑了在组合气室上安装单个涡轮机的可能性，以降低整体 PTO 成本。发现双径向涡轮机的转速在最活跃的海况期间很少超过最大允许限制，而威尔斯涡轮机经常超过该限制。发现引入安全阀对于将 PTO 转速保持在安全限制内是必要的。通过最大化发电厂的性能来选择最佳涡轮直径、发电机额定功率和多室配置。