This research work presents an investigation into the effects of wave spectra on energy conversion for wave energy converters and shows it may be important what theoretical spectrum should be used for a better assessment of a wave energy converter (WEC) in the given sea conditions in a proposed deployment site. To illustrate the problem and the solution, a slightly modified Reference Model 3 (RM3) self-referencing floating point absorber device is used for examining the effects of spectrum types on wave energy conversion. The compared wave spectra include the most used theoretical wave spectra, such as the standard JONSWAP and Bretschneider spectra, as well as the real sea spectrum from field measurements. From the analysis it is shown that the modified RM3 WEC extracts a similar amount of energy from the recorded sea conditions (measured at the AMETS site 2010) when the device is optimized to both the Bretschneider spectrum and the real sea spectrum while the use of the JONSWAP spectrum for optimization leads to an over-prediction in the annual energy production of 16.5%. This may be because, in many practical applications for wave energy development, the JONSWAP spectrum is often preferred by the developers for assessing the device power performance. However, the use of the narrower JONSWAP spectrum (compared to the Bretschneider spectrum) may lead to inaccurate optimization results and power performance data for the device. Therefore, using the correct wave spectrum shapes in the assessment and optimization of a device is suggested for a more accurate assessment and a better understanding of the overall power performance of the device.

中文翻译：

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波谱对波能转换影响的研究

这项研究工作对波浪能谱对波浪能转换器能量转换的影响进行了调查，并表明在特定海况下，应该使用何种理论频谱来更好地评估波浪能转换器 (WEC) 可能很重要。建议的部署地点。为了说明问题和解决方案，使用稍微修改的参考模型 3 (RM3) 自参考浮点吸收器设备来检查频谱类型对波能转换的影响。比较的波浪光谱包括最常用的理论波浪光谱，例如标准的 JONSWAP 和 Bretschneider 光谱，以及来自现场测量的真实海洋光谱。从分析中可以看出，当设备针对 Bretschneider 光谱和真实海洋光谱进行优化时，改进的 RM3 WEC 从记录的海况（在 2010 年 AMETS 站点测量）中提取了相似数量的能量，同时使用用于优化的 JONSWAP 频谱导致对年能源生产的 16.5% 的高估。这可能是因为，在波浪能开发的许多实际应用中，开发人员通常首选 JONSWAP 频谱来评估设备功率性能。但是，使用更窄的 JONSWAP 频谱（与 Bretschneider 频谱相比）可能会导致设备的优化结果和功率性能数据不准确。所以，