State space model of an array of oscillating water column wave energy converters with inter-body hydrodynamic coupling
State space model of an array of oscillating water column wave energy converters with inter-body hydrodynamic coupling
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DOI：
10.1016/j.oceaneng.2019.106668
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发表时间：
2020
影响因子：
5
通讯作者：
D. Gaebele;M. Magaña;T. Brekken;O. Sawodny
中科院分区：
文献类型：
--
作者：
D. Gaebele;M. Magaña;T. Brekken;O. Sawodny
在本文中，我们推导出一个状态空间模型，限制到起伏运动的全尺寸阵列的浮动水柱（OWC）波能转换器与非线性动力输出动力学，考虑所有机构之间的水动力相互作用。由此产生的状态空间模型的目的是作为一个基础，加速发展先进的控制方法，以最大限度地发电。传递到空气室的动能和势能引起压力差，引起新型双径向涡轮机的单向运动。考虑到气体可压缩性的非线性，这可以使用压力相关的涡轮机特性来精确地建模。浮动OWC的分析模型是基于线性水动力系数，使用边界元求解器ANSYS Aqwa的Marmok-A-5型轴对称浮动OWC的等边三角形阵列。最后，在不同的波浪气候下，对系统的时域模型方程进行了仿真，并应用理想的主动控制器来最大化能量转换。对于具体实施的分离距离，所产生的跨体相互作用被发现是可以忽略不计的不规则相比，规则波的情况。涡轮机的转速表明，在半全局方法用于优化发电之前，应先研究间断非线性控制方法。
In this paper we derive a state-space model restricted to heave motion of a full scale array of floating oscillating-water-column (OWC) wave energy converters with nonlinear power take off dynamics, taking hydrodynamic interactions between all bodies into account. The resulting state-space model is intended as a basis for accelerated development of advanced control approaches to maximize power generation. The kinetic and potential energy transferred to the air chamber causes a pressure difference, inducing unidirectional motion of a novel bi-radial turbine. This can be accurately modeled using pressure dependent turbine characteristics, taking into account the nonlinearity of the gas compressibility. The analytical model of the floating OWC is based on linear hydrodynamic coefficients, obtained using the boundary element solver ANSYS Aqwa of an equilateral triangle array of axis-symmetric floating OWCs of the Marmok-A-5 type. Finally, the system’s model time domain equations are simulated in different wave climates and an ideal active controller is applied to maximize energy conversion. For the specific implemented separation distance the resulting cross body interactions are found to be negligible in irregular compared to regular wave scenarios. The turbine rotational speed suggests investigations on discontinues nonlinear control methods before semi-global approaches are used to optimize power generation.