Work

Modular Multilevel Converter with Novel Octal-Switch Redundant Submodules to Ride Through Open-Circuit Faults

Year: 2025

Type: article

Abstract: A modular multilevel converter (MMC) with octal-switch redundant submodules is proposed to ride through open-circuit faults from insulated gate bipolar transistors. Faults are detected using a residual analysis method, followed by prompt compensation for insufficient voltage. An active fault diagnosis method is subsequently applied to accurately identify the faulty switch location, bypass the affected submodule, and engage redundant modules to maintain converter output, thereby achieving ride-through operation for open-circuit faults. The proposed fault ride-through can quickly detect faults and identify the types without requiring additional sensors or complex mathematical models. This ensures the stable operation of the MMC with the proposed octal-switch redundant submodules. The proposed circuit and control are validated through simulations.

Source: IEEJ Journal of Industry Applications

DOI: 10.1541/ieejjia.24015161

Authors: Mei-Fang Wang, Chen-Han Lin, Pei-Wen Lee, Tzung-Lin Lee

Institution: National Sun Yat-sen University

Language: English

Topic: HVDC Systems and Fault Protection

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Industry, innovation and infrastructure, Affordable and clean energy

Open Access status: diamond

Funder: National Science and Technology Council