Design and analysis of a novel multilevel active-clamped power-converter

摘要: Multilevel converter technology has been receiving increasing attention during the last years due to its important advantages compared conventional two-level conversion. converters reduce voltage across each semiconductor. These also synthesize waveforms with better harmonic spectrum, and in most cases, efficiency of power conversion system. However, a larger quantity semiconductors is needed modulation strategy control them becomes more complex. There are three basic multilevel topologies: diode clamped, flying capacitor, cascaded H-bridge separate dc sources. Numerous hybrid configurations combining other topologies have presented literature. A novel active-clamped (MAC) topology subject study present thesis. This derived from generalized by simply removing all capacitors. The can be seen as an extension into arbitrary number levels three-level active neutral-point-clamped (ANPC) topology. controlled using proper set switching states state transition strategy, which permits obtain maximum benefits converter. In this thesis, performance operating capabilities MAC studied through comprehensive fault-tolerance analyses. The analysis comprises power-device conduction losses topology, followed analytical experimental comparisons between converters. In capacity both open- short-circuit faults considered carried out under single-device two-simultaneous-device faults. Switching strategies overcome limitations caused variations increment ability proposed. The thesis proposes guidelines guarantee design improve performance.