3-D SVM for Three-Phase Open-End Winding Drives With Common DC Bus

Existing modulation strategies for three-phase open-end winding drives (OWDs) with common dc bus usually conduct the modulations for alpha-beta subspace and zero-sequence loop (ZSL) separately, which cannot reflect the relationship between alpha-beta subspace and ZSL and fully utilize the dc bus voltage. To this end, this article proposes a three-dimensional space vector modulation (3-D SVM) strategy for three-phase OWDs with common dc bus, which can be conducted in both a-b-c and alpha-beta-z coordinates, leading to full utilization of dc bus voltage and convenient over-modulation adjustment. Voltage vector distributions of OWD in the 3-D spaces with a-b-c and alpha-beta-z coordinates are revealed at first. Subsequently, the three adjacent voltage vectors for reference voltage vector synthesis are selected based on the relationship between leg-voltage potentials, avoiding the complex tetrahedron identification in existing 3-DSVMsfor other drive topologies. In addition, overmodulation in different coordinates is also investigated. Experimental results are presented to validate the feasibility of the proposed 3-D SVM for OWDs with common dc bus.

Automated summary

In this article, a three-dimensional space vector modulation (3-D SVM) strategy for three-phase open-end winding drives with common dc bus is proposed, which can be conducted in both a-b-c and alpha-beta-z coordinates, leading to full utilization of the dc bus voltage and convenient over-modulation adjustment. The voltage vector distributions in the 3-D spaces with a-b-c and alpha-beta-z coordinates are revealed, and three adjacent voltage vectors are selected for reference voltage vector synthesis based on the relationship between leg-voltage potentials. Furthermore, the overmodulation in different coordinates is also investigated. Experimental results validate the feasibility of the proposed 3-D SVM for OWDs with common dc bus.