With the increasing demand for industrial processes for power rating, quality and faster dynamics, multilevel converters and structures have been developed and became popular. Among them, the open-end winding topology is an advantageous structure for its lower device count and switching redundancy. This paper presents a vector modulation technique for one of these systems, which employs a pair of two-level converters, being equivalent to a traditional three-level system. The strategy uses the nearest space vectors to the reference in order ensure a good power quality on the output. Its main features are the balance of commutations among devices, its constant switching rate and the higher frequency current ripple. The characteristics of the fixed switching patterns to obtain the best quality on the output are presented along with simulation results that demonstrate the accomplishment of the strategy goals.

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