Abstract

The Modular Multilevel Converter (MMC) has modular and redundant structure, which makes it more reliable during certain fault conditions. Hence MMC technology has received considerable attention among various topologies for interconnecting High Voltage Direct Current (HVDC) grid. Existing literature has devoted limited focus on the behavior of the MMC during internal fault condition. This paper presents the switching as well as approximate voltage source model of MMC with analysis of its internal fault current behavior. It also presents an analytical approach for calculating harmonic components in arm current. The simulation studies with both MMC models rated at 161 kV, 625 MVA are performed using MATLAB/Simulink. For this study the power transfer is controlled by changing modulation signal. Presented results emphasize on understanding fault current behavior for various internal faults in MMC.

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