Modeling and analysis of a sea wave energy converter

This paper presents the analysis and optimization of a wave-to-wire energy converter developed by COPPE / UFRJ researchers. The main features of this technology are: the use of a Hydropneumatic Storage System (HSS) to filter the wave power oscillations absorbed and a Double Feed Induction Generator (DFIG) to perform electromechanical energy conversion. Mathematical models for all conversion stages (from the waves to the electrical grid) are shown and the integrated control strategy of electromechanical and hydropneumatic systems is proposed to maximize the utilization of Wave Energy Converter (WEC). Simulation results (MATLAB/SIMULINK) are presented to evaluate the performance of energy storage systems (compression air and rotating masses inertia) and their impact on the power quality.