Optimization of Mooring Configuration Parameters of Floating Wave Energy Converters
Optimization of Mooring Configuration Parameters of Floating Wave Energy Converters
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DOI：
10.1115/omae2011-49955
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
P. Vicente;A. Falcão;P. Justino
中科院分区：
文献类型：
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作者：
P. Vicente;A. Falcão;P. Justino
浮点吸收器装置是用于部署在海上的一大类波浪能转换器，通常在40至100米之间的水深中。作为浮式油气平台，这些装置会受到波浪、水流和风造成的漂移力，因此必须通过适当的系泊系统保持就位。虽然在能量转换系统和浮动平台之间可以发现相似之处，但是它们之间的系泊设计要求将具有一些重要的差异，其中之一与以下事实相关：在波浪能转换器的情况下，系泊连接件可以通过与其振荡相互作用而显著地改变其能量吸收特性。因此，根据转换器规范，检查什么可能是更适合波浪能装置的系泊设计是很重要的。在为设备定义系泊系统时，必须确定几个初始参数，例如缆绳材料和厚度、到海底系泊点的距离，这些参数可能会影响设备在运动、功率输出和生存能力方面的性能。可以建立可接受间隔的不同参数将代表不同的功率消耗、从平衡位置的位移、对系泊设备的负载需求，当然还有不同的成本。这里介绍的工作分析了波浪能转换器浮点吸收器的最佳系泊配置参数，考虑到某些预先确定的可接受间隔，并使用考虑系泊系统引入的非线性的时域模型。针对由规则波中的半球形浮标组成的系统的两种不同系泊配置，并假设为线性PTO，提供了系泊力需求以及运动和吸收功率的数值结果。版权所有© 2011，ASME
Floating point absorbers devices are a large class of wave energy converters for deployment offshore, typically in water depths between 40 and 100m. As floating oil and gas platforms, the devices are subject to drift forces due to waves, currents and wind, and therefore have to be kept in place by a proper mooring system. Although similarities can be found between the energy converting systems and floating platforms, the mooring design requirements will have some important differences between them, one of them associated to the fact that, in the case of a wave energy converter, the mooring connections may significantly modify its energy absorption properties by interacting with its oscillations. It is therefore important to examine what might be the more suitable mooring design for wave energy devices, according to the converters specifications. When defining a mooring system for a device, several initial parameters have to be established, such as cable material and thickness, distance to the mooring point on the bottom, and which can influence the device performance in terms of motion, power output and survivability. Different parameters, for which acceptable intervals can be established, will represent different power absorptions, displacements from equilibrium position, load demands on the moorings and of course also different costs. The work presented here analyzes what might be, for wave energy converter floating point absorber, the optimal mooring configuration parameters, respecting certain pre-established acceptable intervals and using a time-domain model that takes into account the non-linearities introduced by the mooring system. Numerical results for the mooring forces demands and also motions and absorbed power, are presented for two different mooring configurations for a system consisting of a hemispherical buoy in regular waves and assuming a liner PTO.Copyright © 2011 by ASME