Switching-Leg Redundancy in Power-Electronic Converters: Topologies, Strategies, and Emerging Directions

Author(s)	Mr. Gajkumar Ramesh Kavathekar, Dr. Suraj Deelip Pawar
Country	India
Abstract	Switching-leg redundancy has become a key design philosophy for modern power-electronic converters, boosting reliability, fault resilience and uninterrupted service. This survey consolidates recent advances in redundant-leg concepts across multi-level inverters, modular multilevel converters (MMCs) and power-electronic building blocks (PEBBs). Redundancy schemes are reviewed from device to full-converter scale, alongside fault-detection, diagnostic and reliability-assessment methods, plus adaptive-control techniques. Results show leg-level redundancy offers the best cost-to-performance compromise relative to device- or module-level options. Contemporary fault-tolerant multi-level inverter configurations markedly raise system dependability; several render a converter immune to both single- and multi-switch faults. AI-driven diagnostics routinely exceed 95% accuracy under varied conditions. The review also highlights self-healing power architectures and reconfigurable topologies that autonomously restore operation with no human input
Keywords	switching-leg redundancy, fault resilience, power-electronic converters, multi-level inverters, reliability analysis, fault diagnostics, modular systems
Field	Engineering
Published In	Volume 16, Issue 3, July-September 2025
Published On	2025-07-24
DOI	https://doi.org/10.71097/IJSAT.v16.i3.7211
Short DOI	https://doi.org/g9vdc5

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International Journal on Science and Technology