Optimization of Wave Energy Converter: DEIM Point Absorber II

The paper presents a possible solution to optimize a wave energy converter, device able to exploit the wave energy resource. The utilization of this technology shows also positive aspects, thanks to the limited visual and environmental impacts. This system could be also installed in reserved areas, being similar to signal buoys, simplifying the problem of energy supply in small islands. In order to exploit the wave energy potential in the Mediterranean Sea, the department of Energy of Palermo University realized a first prototype of the electrical linear generator, that is the main component of the wave energy converter. This electrical machine can be operated by a two-floating buoys system, able to produce a linear vertical motion. The main goal of this paper is investigating the advantages and the disadvantages of the utilization of steel materials to realize the stator of linear generators. Thus, starting from the prototype already realized, the Authors analyses the effects produced by the replacement of steel in the stator with a non-magnetic material. As terms of comparison, the Authors considered the analysis of no-load voltages, using a three-phases connection of windings, and magnetic force produced by the interaction of magnets with the stator. Each aspect above mentioned was studied through numerical simulation (FEM tools) and mathematical models.