All-electric Wave Energy Converter array with energy storage and reactive power compensation for improved power quality

2012 ◽  
Author(s):  
Jonas Sjolte ◽  
Gaute Tjensvoll ◽  
Marta Molinas
Keyword(s):  
Energy Storage ◽  
Power Quality ◽  
Wave Energy ◽  
Reactive Power ◽  
Reactive Power Compensation ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Electric Wave

scholarly journals Wave-to-Wire Power Maximization Control for All-Electric Wave Energy Converters with Non-Ideal Power Take-Off

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2948
Author(s):  
Sousounis ◽  
Shek
Keyword(s):  
Wave Energy ◽  
Reactive Power ◽  
Energy Resource ◽  
Wave Energy Converter ◽  
Floating Body ◽  
Maximum Efficiency ◽  
Energy Converter ◽  
Electric Wave ◽  
Wave Energy Converters ◽  
Energy Converters

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.

Energy storage system for off-grid testing of a Wave Energy Converter

2016 ◽  
Author(s):  
Kristof L De Koker ◽  
Guillaume Crevecoeur ◽  
Bart Meersman ◽  
Marc Vantorre ◽  
Lieven Vandevelde
Keyword(s):  
Energy Storage ◽  
Wave Energy ◽  
Storage System ◽  
Energy Storage System ◽  
Wave Energy Converter ◽  
Energy Converter
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