High-Capacity Wave Energy Conversion by Multi-Float, Multi-PTO, Control and Prediction: Generalized State-Space Modelling With Linear Optimal Control and Arbitrary Headings
High-Capacity Wave Energy Conversion by Multi-Float, Multi-PTO, Control and Prediction: Generalized State-Space Modelling With Linear Optimal Control and Arbitrary Headings
复制标题
通过多浮子、多 PTO、控制和预测进行高容量波浪能转换：具有线性最优控制和任意航向的广义状态空间建模
DOI：
10.1109/tste.2021.3082510
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发表时间：
2021
影响因子：
8.8
通讯作者：
Liao Z
中科院分区：
文献类型：
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作者：
Liao Z
具有类似于或大于风力涡轮机的容量的波浪能转换器对于向电网供电是期望的。结果表明，这可能是由多个浮子在一个铰链筏型配置与多模式强迫。所分析的案例有8个浮子和4个动力输出（PTO）装置。分析是基于线性衍射辐射建模，验证了在波池实验与少量的浮子。控制是理想的，以提高能量捕获，主要表现为点吸收器，但这还没有被应用到这样一个复杂的问题，许多自由度。状态空间形式的线性水动力学模型使得真实的实时实现先进的控制算法成为可能。线性非因果最优控制（LNOC）应用与波浪力预测的自回归。对于零航向的设计情况，由于配置自然地朝向波浪方向，能量捕获提高了21%至83%。能量捕获约为理想分析中最大可能值的62%。非设计，非零航向也进行了分析，以表明如何可以减少能量捕获，从不同的强迫模式的贡献不同的航向和能量捕获总是通过控制，提高了几倍的航向。
Wave energy converters with capacity similar to, or greater than, wind turbines are desirable for the supply of electricity to the grid. It is shown that this may be provided by multiple floats in a hinged raft-type configuration with multi-mode forcing. The case analysed has 8 floats and 4 power take off (PTO) units. Analysis is based on linear diffraction-radiation modelling, validated in wave basin experiments with a smaller number of floats. Control is desirable to improve energy capture, mainly demonstrated for point absorbers, but this has not previously been applied to such a complex problem with many degrees of freedom. The linear hydrodynamic model in a state-space form makes it possible to implement advanced control algorithms in real time. Linear non-causal optimal control (LNOC) is applied with wave force prediction from auto-regression. For the design case with zero heading, as the configuration heads naturally into the wave direction, energy capture is improved by between 21% and 83%. The energy capture is about 62% the maximum possible from idealised analyses. Off-design, non-zero headings are also analysed to indicate how energy capture can be reduced; the contribution from different modes of forcing varies with heading and energy capture is always improved by control, by several times atheading.