Thyristor Branch-Assisted Modular Multilevel Converter for Handling DC Short-Circuit Faults

Le résumé fourni par la source

At present, High Voltage Direct Current (HVDC) transmission is increasingly critical in renewable energy grid integration and regional grid interconnections. However, DC short-circuit faults remain a major challenge to HVDC system stability. While modular multilevel converters (MMC) have been widely adopted, their DC fault-clearing capability is limited by the required proportion of full-bridge submodules (FBSM), which also brings high losses and costs. In this paper, a thyristor branch-assisted MMC topology and corresponding control strategy are proposed to handle DC short-circuit faults. By transferring energy from the AC side to the thyristor branch during faults, the scheme reduces the AC-side fault current contribution. MATLAB/Simulink simulations demonstrate effective fault clearance with a low unipolar full-bridge submodule (UFBSM) ratio.

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