Optimal Cyclic Control of an Ocean Kite System in a Spatiotemporally Varying Flow Environment
Optimal Cyclic Control of an Ocean Kite System in a Spatiotemporally Varying Flow Environment
复制标题
时空变化流环境下海洋风筝系统的最优循环控制
DOI：
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
C. Vermillion
中科院分区：
文献类型：
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作者：
James Reed;Joshua Daniels;Ayaz Siddiqui;Mitchell Cobb;M. Muglia;C. Vermillion
本文提出了一种技术，用于最大限度地提高电力生产的系留海洋能源收集风筝执行横流8字飞行在三维时空变化的流动环境。为了产生净正功率输出，风筝采用循环绕线方法，其中风筝在以高张力横流8字形飞行时被绕出，然后在低张力下被径向绕向基站。目前的工作集中在两个关键的贡献。首先，我们提出了一个过渡控制器，用于在变流量条件下在发电卷出操作和低压（耗电）卷入操作之间进行鲁棒切换。其次，我们提出了一个优化，选择线轴出的速度和平均仰角的风筝在线轴出阶段，使每个线轴周期产生的净功率最大化。一个六度的自由风筝模型在三维时空变化的流动环境（叠加高频湍流到低频流场）的模拟结果显示为基线的情况下，以及优化的情况下。这些仿真结果表明，稳健的过渡，沿着与9.3%的循环平均功率输出增加作为优化的结果。
This paper presents a technique for maximizing the power production of a tethered marine energy-harvesting kite performing cross-current figure-eight flight in a 3D spatiotemporally varying flow environment. To generate a net positive power output, the kite employs a cyclic spooling method, where the kite is spooled out while flying in high-tension cross-current figure-eight flight, then spooled in radially towards the base-station under low tension. The present work focuses on two key contributions. First, we present a transition controller for robustly switching between power-generating spool-out operation and low-tension (power-consuming) spool-in operation under variable flow conditions. Second, we present an optimization that selects spool-out speeds and mean elevation angles for the kite during the spool-out phase such that the net power produced per spooling cycle is maximized. Simulation results for a six-degree-of-freedom kite model in a 3D spatiotemporally varying flow environment (which superimposes high-frequency turbulence onto a low-frequency flow field) are shown for a baseline case as well as an optimized case. These simulation results show robust transition, along with a 9.3 percent cycle-averaged power output increase as a result of the optimization.