Lakshmi Bhat
Independent Researcher
India
Abstract
This manuscript presents a comprehensive study of three-level inverter topologies designed for high-power industrial applications, focusing exclusively on technologies available up to 2016. We examine the evolution, operating principles, and comparative merits of the Neutral-Point-Clamped (NPC), Flying Capacitor (FC), and Cascaded H-Bridge (CHB) three-level inverters. Detailed case studies illustrate implementations in renewable energy integration, variable-speed drives, and high-voltage direct-current (HVDC) transmission. A rigorous methodology section outlines simulation models and experimental validation performed on laboratory prototypes rated at 100 kW. Results demonstrate each topology’s performance in terms of voltage quality, efficiency, switching stress, and thermal management. We conclude by summarizing the trade-offs between complexity, reliability, and scalability, and by proposing guidelines for topology selection in various high-power scenarios. Finally, scope and limitations are discussed.
Keywords
Three-level inverter, NPC, FC, CHB, high-power applications, PWM, multilevel converters
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