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http://dx.doi.org/10.5762/KAIS.2020.21.3.17

Development of Simulation Model for Modular Multilevel Converters Using A Dynamic Equivalent Circuit  

Shin, Dong-Cheoul (School of Electronic and Electrical Engineering, Hongik University)
Lee, Dong-Myung (School of Electronic and Electrical Engineering, Hongik University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.21, no.3, 2020 , pp. 17-23 More about this Journal
Abstract
This paper proposes a simulation model using an equivalent circuit for the development of an MMC system. The MMC has been chosen as the most suitable topology for high voltage power transmission, such as a voltage-type HVDC, and it has dozens to hundreds of sub-modules in the form of a half-bridge or full-bridge connected in series. A simulation study is essential for the development of an MMC algorithm. On the other hand, it is virtually impossible to construct and implement MMC simulation models, including hundreds or thousands of switching devices. Therefore, this paper presents an MMC equivalent model, which is easily expandable and implemented by modeling the dynamic characteristics. The voltage and current equation of the equivalent circuit was calculated using the direction of the arm current and switching signal. The model was implemented on Matlab/Simulink. In this paper, to show the validity of the model developed using Matlab/Simulink, the simulation results of a five-level MMC using the real switching element and the proposed equivalent model are shown. The validity of the proposed model was verified by showing that the current and voltage waveform in the two models match each other.
Keywords
MMC(modular multilevel converter); HVDC; Equivalent circuit model; Simulink model; PWM;
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