Abstract
Summary form only given, as follows. The complete presentation was not made available for publication as part of the conference proceedings. In the future smart grid, it is a significant trend to integrate large capacity renewable energy into medium voltage (MV) DC grids. The high-power conversion techniques for wind generation, photovoltaic generation and hydrogen energy system integrated into MVDC grids are reviewed and compared in this lecture, including the system configurations, AC-DC and DC-DC converter designs, control strategies and fault protection. Novel solutions of DC grid-connected photovoltaic generation system are presented, providing new ways to integrate solar energy to DC grids with high efficiency and high-power density. As the key element of high-power isolated DC-DC converters, high frequency transformers with high withstand voltage are studied in terms of multi-physics modeling, magnetic integration, insulation design, thermal design and multi-objective optimization.
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