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JPE, Vol. 17, No. 1, January 2017
Improved Pre-charging Method for MMC-Based HVDC Systems Operated in Nearest Level Control
Kyo-Min Kim, Jae-Hyuk, Kim, Do-Hyun Kim, Byung-Moon Han, and Jun-Young Lee
Area High Power Converters
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.
Keyword 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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