Minimum-loss minimum-distortion space vector sequence generator for high-reliability three-phase power converters for aircraft applications

This paper presents the analysis and design of an all-digital space vector modulator for high-performance voltage-source converters. The modulator features a fast rule-based sector identification algorithm, sheer simple arithmetic for its conduction time determination, continuously adjusted zero state selection based on the AC currents magnitudes, and switching frequency minimization through sequence-reversal in odd and even sectors. The paper includes a detailed description and analysis of three discontinuous space vector sequences featuring DC-bus clamping for switching losses minimization, and active-state splitting for distortion minimization. An evaluation including AC and DC distortion factors, commutation frequency, and losses is presented for verification of the proposed modulator.