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http://dx.doi.org/10.6113/TKPE.2017.22.4.285

Improved Modulation Scheme for Medium Voltage Modular Multi-level Converter Operated in Nearest Level Control  

Kim, Do-Hyun (Electrotechnology R&D Division, LS Industrial Systems)
Kim, Jae-Hyuk (Dept. of Electrical Engineering Myongji University)
Han, Byung-Moon (Dept. of Electrical Engineering Myongji University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.22, no.4, 2017 , pp. 285-296 More about this Journal
Abstract
This paper proposes an improved modulation scheme for the medium voltage modular multi-level converter (MMC), which operates in the nearest level control and applies in the medium voltage direct current (MVDC) system. In the proposed modulation scheme, the offset (neutral-to-zero output) voltage is adjusted, with the phase voltage magnitude, thereby maintaining a constant value with N+1 level in the controllable modulation index (MI) range. In order to confirm the proposed scheme's validity, computer simulations for the 22.9 kV - 25 MVA MMC were performed with PSCAD/EMTDC, as well as hardware experiments for the 380 V - 10 kVA MMC. The proposed modulation scheme offers to build a constant pole voltage regardless of the MI value, and to build a phase voltage with improved total harmonic distortion (THD).
Keywords
MMC(Modular Multi-level Converter); MVDC(Medium Voltage Direct Current) system; NLC (Nearest Level Control); SM(Sub-Module); DC voltage balancing; MI(Modulation Index); THD (Total Harmonic Distortion);
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Times Cited By KSCI : 2  (Citation Analysis)
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