Modular Isolated LLC DC/DC Conversion System for Offshore Wind Farm Collection and Integration

Compared with conventional offshore wind farm ac collection and high-voltage dc (HVDC) transmission system, the all system shows advantages characteristics of higher power density, lower costs, efficiency in many analyses. This letter proposed a novel for integration. The presented is composed several medium-voltage (MV) systems system. A modular isolated dc/dc converter (MIDC) topology MV to raise medium voltage level, while realizing maximum point tracking (MPPT) connected generators. Thorough comparisons three candidates are carried out, LLC resonant found be optimal submodule (SM) MIDC. Furthermore, two-layer control MIDC developed obtain current sharing achieving MPPT generators meantime. time-domain simulation model consisting 160 SMs using PSCAD, prototype nine built experiments. feasibility pure verified by both experimental results.