Model Predictive Control of Buoy Type Wave Energy Converter
Model Predictive Control of Buoy Type Wave Energy Converter
复制标题
浮标式波浪能转换器的模型预测控制
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
M. Mirzaei
中科院分区：
文献类型：
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作者：
M. Soltani;M. T. Sichani;M. Mirzaei
摘要 本文介绍了 Wavestar 波浪能转换器，并介绍了最大化发电量的模型预测控制器的实现。使用连接到振荡浮标的液压发电机提取海浪能量。发电机是附接到浮标的附加装置，其可能包括阻尼、刚度或类似术语，因此将影响浮标的动态运动。因此，这样的装置可以被视为闭环控制器。波浪能转换器的目标是从海洋中获取尽可能多的能量。该最大化问题的直接解决方案是通过最大化浮标的瞬时运动范围来实现。浮标作为单自由度振荡器，在与海况共振时将产生最大运动。因此，通过强制这个条件来实现问题的最佳解决方案。本文展示了这一原理的理论框架。最优控制器需要无限视野的海况信息，这是不适用的。模型预测控制器 (MPC) 可以具有有限范围，从而满足了这一要求。然后考虑这种方法，并为模型波浪能转换器设计 MPC 控制器并在数值示例中实现。此外，将该控制器的功率输出与最佳控制器进行比较，作为设计控制器性能的指标。
Abstract The paper introduces the Wavestar wave energy converter and presents the implementation of model predictive controller that maximizes the power generation. The ocean wave power is extracted using a hydraulic electric generator which is connected to an oscillating buoy. The power generator is an additive device attached to the buoy which may include damping, stiffness or similar terms hence will affect the dynamic motion of the buoy. Therefore such a device can be seen as a closed-loop controller. The objective of the wave energy converter is to harvest as much energy from sea as possible. The straight forward solution to this maximization problem is achieved by maximizing the instantaneous range of motion of the buoy. The buoy as a single degree of freedom oscillator will undergo its maximum movements when it is in resonance with the sea state. Hence the best solution to the problem is achieved by forcing this condition. In the paper the theoretical framework for this principal is shown. The optimal controller requires information of the sea state for infinite horizon which is not applicable. Model Predictive Controllers (MPC) can have finite horizon which crosses out this requirement. This approach is then taken into account and an MPC controller is designed for a model wave energy converter and implemented on a numerical example. Further, the power outtake of this controller is compared to the optimal controller as an indicator of the performance of the designed controller.