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http://dx.doi.org/10.6113/JPE.2017.17.1.127

Improved Pre-charging Method for MMC-Based HVDC Systems Operated in Nearest Level Control  

Kim, Kyo-Min (Department of Electrical Engineering, Myongji University)
Kim, Jae-Hyuk (Department of Electrical Engineering, Myongji University)
Kim, Do-Hyun (Department of Electrical Engineering, Myongji University)
Han, Byung-Moon (Department of Electrical Engineering, Myongji University)
Lee, Jun-Young (Department of Electrical Engineering, Myongji University)
Publication Information
Journal of Power Electronics / v.17, no.1, 2017 , pp. 127-135 More about this Journal
Abstract
Recently the researches on modular multi-level converter (MMC) are being highlighted because high quality and efficient power transmission have become key issues in high voltage direct current (HVDC) systems. This paper proposes an improved pre-charging method for the sub-module (SM) capacitor of MMC-based HVDC systems, which operates in the nearest level control (NLC) modulation and does not need additional circuits or pulse width modulation (PWM) techniques. The feasibility of the proposed method was verified through computer simulations for a scaled 3-phase 10kVA MMC with 12 SMs per each arm. Hardware experiments with a scaled prototype have also been performed in the lab to confirm the simulation results.
Keywords
High voltage direct current (HVDC) systems; Modular multilevel converter (MMC); Nearest level control (NLC); Pre-charging method; Sub-module (SM) capacitors;
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