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http://dx.doi.org/10.5370/KIEE.2014.63.12.1640

Switching Frequency Reduction Method for Modular Multi-level Converter Utilizing Redundancy Sub-module  

Lee, Yoon-Seok (Dept. of Electrical Engineering, Myongji University)
Yoo, Seung-Hwan (Dept. of Electrical Engineering, Myongji University)
Choi, Jong-Yun (Hyosung Corporation and Dept. of Electrical Engineering, Myongji University)
Park, Yong-Hee (Hyosung Corporation and Dept. of Electrical Engineering, Myongji University)
Han, Byung-Moon (Dept. of Electrical Engineering, Myongji University)
Yoon, Young-Doo (Dept. of Electrical Engineering, Myongji University)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.63, no.12, 2014 , pp. 1640-1648 More about this Journal
Abstract
This paper proposes a switching frequency reduction method for MMC (Modular Multilevel Converter) utilizing redundancy operation of sub-module, which can offer reduction of voltage harmonics and switching loss. The feasibility of proposed method was verified through computer simulations with PSCAD/EMTDC software. Based on simulation analysis, a hardware scaled-model of 10kVA, DC-1000V MMC was designed and manufactured in the lab. Various experiments were conducted to verify the feasibility of proposed method in the actual hardware system. The hardware scaled-model can be effectively utilized for analyzing the performance of MMC according to the modulation scheme and redundancy operation.
Keywords
HVDC (high-voltage DC transmission); MVDC (medium-voltage DC transmission); MMC (modular multi-level converter); SM (sub-module); DC voltage balancing; redundancy sub-module; harmonic reduction; NLC (Nearest Level Compensation); Hardware Scaled-Model;
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