Wave energy converters transform ocean energy which varies irregularly into electricity with a constant voltage and constant frequency. The converted electricity must satisfy the grid-connection requirements  in the frequency fluctuations and voltage fluctuations, and must be maximized as much as possible.
To maximize the power that satisfies the requirements, it is necessary to optimize the rating of the electrical components, which include generators, inverters and converters. However,
a method of selecting electric parts have not been established. This is because the input energy is irregular and it covers several disciplines such as machinery, electricity, hydrodynamics and control. Therefore, it is necessary to fabricate a power conversion system in the laboratory and select elements and control that maximize power conversion under input conditions simulating ocean waves.