High efficiency indirect matrix converter topologies

This paper discusses new three-phase ac-ac Indirect Matrix Converter (IMC) topologies featuring higher power efficiency than conventional IMCs. Initially, a new Inverting-link Matrix Converter (ILMC) with lower conduction power losses than a standard ILMC for voltage step-down operation is proposed. New Ultra-Sparse Matrix Converters (USMCs) well-suited for voltage step-down applications are also presented. These circuits have redundant current paths to distribute the impressed dc-link current to the input terminals which can be potentially used to reduce semiconductor losses. A voltage step-up USMC, referred to as delta-switch USMC (Δ-USMC), well-suited for wind power generation systems, where low inductance machines are used, is also analyzed. In order to benefit from the best features of the proposed IMCs, standard and new space vector modulations featuring distinctive commutation schemes are presented. Finally, to demonstrate the advantages of the studied IMCs, power loss comparisons of these solutions and standard IMCs rated to 10 kW are shown.