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Numerical and experimental studies of excitation force approximation for wave energy conversion

机译：波能转换的激振力近似数值和实验研究

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Past or/and future information of the excitation force is useful for real-time power maximisation control of Wave Energy Converter (WEC) systems. Current WEC modelling approaches assume that the wave excitation force is accessible and known. However, it is not directly measurable for oscillating bodies. This study aims to provide accurate approximations of the excitation force for the purpose of enhancing the effectiveness of WEC control. In this work, three approaches are proposed to approximate the excitation force, by (i) identifying the excitation force from wave elevation, (ii) estimating the excitation force from the measurements of pressure, acceleration and displacement, (iii) observing the excitation force via an unknown input observer. These methods are compared with each other to discuss their advantages, drawbacks and application scenarios. To validate and compare the performance of the proposed methods, a 1/50 scale heaving point absorber WEC was tested in a wave tank under variable wave scenarios. The experimental data were in accordance with the excitation force approximations in both the frequency- and time-domains based upon both regular and irregular wave excitation. Although the experimental data were post-processed for model verification, these approaches can be applied for real-time power maximisation control with excitation force prediction. (C) 2018 Elsevier Ltd. All rights reserved.
机译：过去或将来的激励力信息对于波动能量转换器（WEC）系统的实时功率最大化控制很有用。当前的WEC建模方法假定波浪激励力是可访问和已知的。但是，它不能直接测量振动体。这项研究旨在提供精确的激振力近似值，以增强WEC控制的有效性。在这项工作中，提出了三种方法来估算激振力，方法是：（i）从波高确定激振力，（ii）从压力，加速度和位移的测量值估算激振力，（iii）观察激振力通过一个未知的输入观察器。将这些方法相互比较以讨论它们的优点，缺点和应用场景。为了验证和比较所提出方法的性能，在可变波浪情况下，在波浪罐中测试了1/50规模的升沉点吸收器WEC。实验数据与基于规则和不规则波激励的频域和时域中的激励力近似一致。尽管对实验数据进行了后处理以进行模型验证，但这些方法可用于具有激励力预测的实时功率最大化控制。 （C）2018 Elsevier Ltd.保留所有权利。

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