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The paper presents the design procedure and modeling of performance for a special coupled electromechanical system, for use in sea wave energy extraction applications. The electromechanical system is consisted of a linear permanent magnet generator (LPMG), combined with a cylindrical floating buoy moving due to the sea wave incidence.The basic advantage using LPMG for sea wave energy extraction applications is that the generator exploits directly the vertical movement of the incident sea wave. In such a case, the linear generator is directly coupled with a vertical cylindrical buoy in heave. This topology involves a lighter and simpler mechanical system, in comparison with a complex system that converts the vertical linear movement of the sea wave to rotation, in case that a rotating generator is used.In order to efficiently exploit the wave energy using a point absorber like a floating buoy, it is important to tune the movement of the coupled mechanism, with the main frequency of the incident wave by using appropriate control. The system analysis requires particularly developed electromagneticmechanical -hydraulic simulation models for the time variation representation of the system's operational parameters.Index Terms--Sea wave energy conversion, coupled subsystems modeling, linear permanent magnet generator, finite element method, sea wave forces. His research involves optimal power generation from renewable energy sources and energy saving devices, design and control. Hybrid systems and wind power energy are the focal points of his research.

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Several operation principles and generator types have been developed because of the growing interest for the wave energy conversion systems (WECSs). A WECS is demanded to be more efficient so that the overview of the already developed systems is necessary. An overview of the different operation principles and the various linear generator types is presented analyzing the advantages and the disadvantages. Finally, a complete scheme gathering the most vital characteristics is introduced.