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Experimental and numerical investigation of non-predictive phase-control strategies for a point-absorbing wave energy converter

机译：点吸收波能量转换器的非预测相位控制策略的实验和数值研究

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摘要

Phase control may substantially increase the power absorption in point-absorber wave energy converters. This study deals with validation of dynamic models and latching control algorithms for an oscillating water column (OWC) inside a fixed vertical tube of small circular cross-section by small-scale testing. The paper describes experimental and numerical results for the system's dynamics, using simple and practical latching control techniques that do not require the prediction of waves or wave forces, and which will be relevant to any type of point-absorbing devices.rnIn the experimental set-up, the upper end of the tube was equipped with an outlet duct and a shut-off valve, which could be controlled to give a latching of the inner free surface movement. The pressure drop through the open valve is used as a simplified measure of the energy extraction. The control was realized by using the real-time measurement signals for the inner and outer surface displacement.rnA mathematical model of the system was established and applied in numerical simulation. In the case the OWC's diameter is much smaller than the wavelength and the wave amplitude much smaller than the draft, the free surface movement inside the tube can be described as an oscillating weightless piston. For this hydrodynamic problem an analytical solution is known. In addition, the mathematical model includes the effects of viscous flow losses, the air compressibility inside the chamber and the pressure drop across the valve. Experimental results were used to calibrate some of the model parameters, and the total model was formulated as a coupled system of six non-linear, first-order differential equations. Time-domain integration was used to simulate the system in order to test the control strategies and compare with experimental results.
机译：相位控制可以大大增加点吸收波能量转换器中的功率吸收。本研究通过小规模测试，对小圆形横截面的固定垂直管内的振荡水柱（OWC）的动力学模型和闭锁控制算法进行了验证。本文使用简单而实用的闭锁控制技术描述了系统动力学的实验和数值结果，这些技术不需要预测波浪或波浪力，并且与任何类型的点吸收装置都相关。向上，该管的上端装有一个出口管道和一个截止阀，可以对它们进行控制，以锁定内部自由表面的运动。通过打开的阀的压降用作能量提取的简化方法。通过使用实时测量信号的内外表面位移来实现控制。建立了该系统的数学模型并将其应用于数值模拟。如果OWC的直径远小于波长，而波幅却远小于吃水深度，则管内的自由表面运动可描述为振荡的失重活塞。对于该流体动力学问题，已知一种分析解决方案。另外，该数学模型还包括粘性流损失，腔室内的空气可压缩性以及整个阀的压降的影响。实验结果被用来校准一些模型参数，整个模型被公式化为一个由六个非线性一阶微分方程组成的耦合系统。为了测试控制策略并与实验结果进行比较，使用时域集成对系统进行了仿真。

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  • 来源
    《Ocean Engineering》 |2009年第5期|386-402|共17页
  • 作者

    M.F.P. Lopes; J. Hals; R.P.F. Gomes; T. Moan; L.M.C. Gato; A.F.de O. Falcao;

  • 作者单位

    IDMEC, Instituto Superior Tecnico, Technical University of Lisbon, 1049-001 Lisbon, Portugal;

    CeSOS, Norwegian University of Science and Technology NTNU, NO-7491 Trondheim, Norway;

    IDMEC, Instituto Superior Tecnico, Technical University of Lisbon, 1049-001 Lisbon, Portugal;

    CeSOS, Norwegian University of Science and Technology NTNU, NO-7491 Trondheim, Norway;

    IDMEC, Instituto Superior Tecnico, Technical University of Lisbon, 1049-001 Lisbon, Portugal;

    IDMEC, Instituto Superior Tecnico, Technical University of Lisbon, 1049-001 Lisbon, Portugal;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ocean waves; wave energy; latching control; point-absorber; threshold unlatching; oscillating water column;

    机译：海浪;波能锁存控制;点吸收剂门限解锁振荡水柱;

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