부산대학교 도서관

This paper presents the analysis of a hydraulic transmission model used in various types of wave energy conversion systems. In this case, a multi-point absorber wave energy converter is used because its structure is simple and efficient. This design offers some advantages such as greater energy harvesting and stabilization of the output power. In this way, the union of the hydraulic system and electric generator in detail is presented. The objective of the proposed approach has been to maintain the speed in the electric generator and reduce the effect of wave energy fluctuation on the output power. At the same time, an MPPT (Maximum Power Point Tracking) control algorithm is incorporated. Its purpose is to obtain maximum efficiency of the proposed system. In addition, the system uses an HVDC line and high-power DC/DC converters to connect to the power grid. The different modules are connected in parallel on the side of the buoy-farm and in series on the HVDC transmission line to achieve high power and high voltage. The developed model also incorporates a decentralized hybrid energy storage system (dHESS) based on ultracapacitors. In many cases, ESS is necessary for the grid integration of marine energy due to flicker restrictions in the devices, which allows us to attenuate the oscillations of energy injected into the HVDC line. The WEC system and the dHESS model have been simulated in Matlab-Simulink. In this way, different simulations have been developed to verify the basic characteristics of the proposed system. The results of the simulated model and the conclusions obtained are also presented in this document.