Wave-to-Wire Power Maximization Control for All-Electric Wave Energy Converters with Non-Ideal Power Take-Off
Wave-to-Wire Power Maximization Control for All-Electric Wave Energy Converters with Non-Ideal Power Take-Off
复制标题
非理想取力器全电动波浪能转换器的波线功率最大化控制
作者：
M. Sousounis;J. Shek
本文提出的研究探讨了优化全电波能转换器以实现最大波线效率的新方法。此外，提出了一种新的基于速度的控制器，这是专门为波线效率最大化。在理想的波能转换器系统中，通过使浮体的流体动力效率最大化来实现功率转换的最大效率。然而，在一个真实的系统中，这涉及到从波到电网的不同阶段的损失，并且全局波线优化不同于流体动力学优化。为此，详细建模了一种使用直接驱动永磁直线发电机的全波到线波能转换器。建模方面包括使用Edinburgh Wave Systems Simulation SDK进行复杂的流体动力学模拟，以及在MATLAB/Simulink中对发电机、控制器、功率转换器和电网连接的输电侧进行电气建模。三个参考控制器开发的基础上，以前的文献：一个真实的阻尼，反应弹簧阻尼和基于速度的控制器。所有三个基于文献的控制器进行了优化，以最大的波线效率为特定的波能资源配置文件。结果表明，利用无功功率使点式吸振器的速度与波浪激振力同相的优点，直接利用基于速度的控制器来实现，可以获得更高的效率。此外，它被证明，最大限度地提高流体动力学能量捕获可能不会导致最大的波线效率。最后，在随机海况下对控制器进行了测试，并对其性能进行了评估。
The research presented in this paper investigates novel ways of optimizing all-electric wave energy converters for maximum wave-to-wire efficiency. In addition, a novel velocity-based controller is presented which was designed specifically for wave-to-wire efficiency maximization. In an ideal wave energy converter system, maximum efficiency in power conversion is achieved by maximizing the hydrodynamic efficiency of the floating body. However, in a real system, that involves losses at different stages from wave to grid, and the global wave-to-wire optimum differs from the hydrodynamic one. For that purpose, a full wave-to-wire wave energy converter that uses a direct-drive permanent magnet linear generator was modelled in detail. The modelling aspect included complex hydrodynamic simulations using Edinburgh Wave Systems Simulation Toolbox and the electrical modelling of the generator, controllers, power converters and the power transmission side with grid connection in MATLAB/Simulink. Three reference controllers were developed based on the previous literature: a real damping, a reactive spring damping and a velocity-based controller. All three literature-based controllers were optimized for maximum wave-to-wire efficiency for a specific wave energy resource profile. The results showed the advantage of using reactive power to bring the velocity of the point absorber and the wave excitation force in phase, which was done directly using the velocity-based controller, achieving higher efficiencies. Furthermore, it was demonstrated that maximizing hydrodynamic energy capture may not lead to maximum wave-to-wire efficiency. Finally, the controllers were also tested in random sea states, and their performance was evaluated.