DCT-REES Note 18 High-Power DC-DC Converters

About

High-power dc-dc converters are key enabling components in MVDC grids as dc transformers, where galvanic isolation is usually required due to the high voltage-ratio and fault isolation requirement. Depending on different applications, unidirectional topologies e.g. series resonant converter (SRC) or bidirectional topologies e.g. dual-active bridge (DAB) converter are the most promising candidates among others, mainly attributed to the soft-switching operation. This note aims to give an introduction of selected dc-dc topologies, the operation principle, and the corresponding control. Following chapters are planned in this note. 1. Introduction of high-power dc-dc converters 2. Soft-switching technique 3. Series-resonant converter 4. Dual-active bridge converter 5. Application examples of high-power dc-dc converters