Quantification of the influence of directional sea state parameters over the performances of wave energy converters
Quantification of the influence of directional sea state parameters over the performances of wave energy converters
复制标题
定向海况参数对波浪能转换器性能影响的量化
DOI：
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发表时间：
2012
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通讯作者：
R. Pascal
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文献类型：
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作者：
R. Pascal
准确预测波能转换器的年发电量对波能产业的发展至关重要。目前的基于功率矩阵的方法只使用了海况估计中的一小部分数据，因此容易产生误差。本文研究了能量产量预测问题，并对功率矩阵方法提出了质疑。这是通过量化几个定向海况参数对波能转换器性能的影响来实现的。所采取的方法是在具有大量海况的爱丁堡弧形水箱中测试几个波能转换器。所选的波能转换器是固定式OWC、作为弱定向装置的一组两个OWC和海水淡化鸭型。使用了单模和双模海况。对于单模海况，考虑了与波系形状有关的参数。对于双模海态，研究了波系峰值的相对位置，并引入了单峰指数来量化海态可被认为是双模的程度。对于所有海国，有效波高保持不变。实验工作需要良好的谱估计。为了提高其稳定性和准确性，对MLM和MMLM进行了调整，以适应确定性波。为了估计每个波浪系统的参数，还开发了一个隔离波浪系统的程序。对于单模谱，可以设计出器件观测性能的参数模型。频率扩展及其与能量周期的相互作用与能量周期本身同样重要，建议将频率扩展用于能量生产预测。对于双峰频谱，发现了鸭子对方向性敏感的证据，而OWCs没有受到影响。
Accurate predictions of the annual energy yield from wave energy converters are essential to the development of the wave industry. The current method based on power matrices uses only a small part of the data available from sea state estimations and it is consequently prone to inaccuracies. The research presented in this work investigates the issue of energy yield prediction and questions the power matrix method. This is accomplished by quantifying the influence of several directional sea states parameters on the performances of wave energy converters. The approach taken was to test several wave energy converters in the Edinburgh Curved tank with a large set of sea states. The selected wave energy converters are a fix OWC, a set of two OWCs acting as a weak directional device and the desalination duck model. Uni-modal and bi-modal sea states were used. For the uni-modal sea states, parameters related to the wave system shape were considered. For the bi-modal sea states, the relative position of the wave system peaks was investigated and the uni-modality index was introduced to quantify the degree to which sea states could be considered bi-modal. For all sea states, the significant wave height was kept constant. The experimental work required good spectral estimates. The MLM and MMLM were adapted to deterministic waves to improve their stability and accuracy. A routine to isolate wave systems was also developed in order to estimate parameters with respect to each wave systems. For uni-modal spectra, parametric models of the observed performances of the devices could be devised. The frequency spreading and its interaction with the energy period proved to be as important as the energy period itself, which suggests that the frequency spreading should be used for energy production prediction. For bi-modal spectra, evidence of the duck sensitivity to directionality was found while the OWCs were not affected.