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Investigation of the Error of Mean Representative Current Velocity Based on the Method of Bins for Tidal Turbines Using ADP Data
Journal of Marine Science and Engineering ( IF 2.7 ) Pub Date : 2020-05-29 , DOI: 10.3390/jmse8060390
Udara Rathnayake , Matt Folley , S.D.G.S.P. Gunawardane , Carwyn Frost

Representing the velocity at a tidal energy extraction site in a standardized manner is essential for the development of the tidal energy sector. The International Electrotechnical Commission (IEC) have issued a technical specification to determine the mean representative current velocity (MRV) relative to a tidal energy converter (TEC). This method determines the MRV using an acoustic Doppler profiler (ADP). This is used to evaluate the power performance of a TEC and so can have a significant influence on the power performance uncertainties, due to the cubed relationship of the MRV and power. This paper investigates these uncertainties in the MRV by considering four sources of uncertainty in the ADP. These are turbulence intensity, tilt, Doppler noise and beam misalignment of an ADP. A synthetically generated dataset is used to define current velocity and profile using the characteristics of currents and ADP. The generated synthetic dataset is processed to calculate the MRV based on the standard IEC method. An alternative method to calculate the MRV, called the temporal-spatial method (TSM), is proposed and the two methodologies are used to assess the error of the MRV. A sensitivity analysis shows that the errors of the MRV based on the standard IEC method are always higher than the TSM. The biases in the MRV based on the different combinations of the uncertainty are investigated and it is found that the bias for the MRVs based on the TSM method is generally less than that of the IEC method.

中文翻译:

基于ADP数据的潮汐涡轮仓法的平均代表流速误差研究。

以标准化的方式表示潮汐能提取站点的速度对于潮汐能领域的发展至关重要。国际电工委员会(IEC)发布了一项技术规范,以确定相对于潮汐能转换器(TEC)的平均代表流速(MRV)。此方法使用声学多普勒分析仪(ADP)确定MRV。这用于评估TEC的功率性能,因此由于MRV和功率之间的立方关系,可能会对功率性能不确定性产生重大影响。本文通过考虑ADP中的四个不确定性来源来研究MRV中的这些不确定性。这些是湍流强度,倾斜度,多普勒噪声和ADP的光束未对准。综合生成的数据集用于使用电流和ADP的特性定义电流速度和轮廓。根据标准IEC方法处理生成的合成数据集以计算MRV。提出了一种计算MRV的替代方法,称为时空方法(TSM),这两种方法用于评估MRV的误差。敏感性分析表明,基于标准IEC方法的MRV的误差始终高于TSM。研究了基于不确定性不同组合的MRV中的偏差,发现基于TSM方法的MRV的偏差通常小于IEC方法的偏差。根据标准IEC方法处理生成的合成数据集以计算MRV。提出了一种计算MRV的替代方法,称为时空方法(TSM),这两种方法用于评估MRV的误差。敏感性分析表明,基于标准IEC方法的MRV的误差始终高于TSM。研究了基于不确定性不同组合的MRV中的偏差,发现基于TSM方法的MRV的偏差通常小于IEC方法的偏差。根据标准IEC方法处理生成的合成数据集以计算MRV。提出了一种计算MRV的替代方法,称为时空方法(TSM),这两种方法用于评估MRV的误差。敏感性分析表明,基于标准IEC方法的MRV的误差始终高于TSM。研究了基于不确定性不同组合的MRV中的偏差,发现基于TSM方法的MRV的偏差通常小于IEC方法的偏差。敏感性分析表明,基于标准IEC方法的MRV的误差始终高于TSM。研究了基于不确定性不同组合的MRV中的偏差,发现基于TSM方法的MRV的偏差通常小于IEC方法中的偏差。敏感性分析表明,基于标准IEC方法的MRV的误差始终高于TSM。研究了基于不确定性不同组合的MRV中的偏差,发现基于TSM方法的MRV的偏差通常小于IEC方法的偏差。
更新日期:2020-05-29
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