Journal
IET POWER ELECTRONICS
Volume 9, Issue 12, Pages 2318-2328Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/iet-pel.2015.0747
Keywords
power convertors; power grids; power transformers; galvanically isolated modular converter; direct current electrical grid; DC electrical grid; low voltage telecom distribution system; LV telecom distribution system; point-to-point high voltage DC transmission; medium voltage domain; protection technology; conversion technology; bidirectional galvanically isolated high power converter; MVDC grid; LVAC grid; line frequency transformer into; modular multilevel converter; MMC
Categories
Funding
- Swiss Commission for Technology and Innovation (CTI)
- Future Swiss Electrical Infrastructure (FURIES)
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Direct current (DC) electrical grids are already a reality in low voltage (LV) telecom distribution systems and point-to-point high voltage DC transmission. Medium voltage (MV) domain, despite its big potential, still suffers from a lack of suitable conversion and protection technologies. This study presents a bidirectional, galvanically isolated, high power converter for interface of emerging MVDC grids with readily available LVAC grids. To achieve high conversion efficiency, the integration of a line frequency transformer into the structure of the modular multilevel converter (MMC) is analysed and described in a systematic manner. Two configurations of the galvanically isolated modular converter: (i) interleaved and (ii) stacked, are derived and presented. Differences and similarities, compared to the classical MMC, are presented on the system design level, while control performances are evaluated by means of simulations.
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