Abstract

This paper presents a floating capacitor (FC) voltage balancing technique, which extends the linear modulation range of a single source three-phase thirteen-level inverter having reduced switch count. Due to lack of suitable redundancies at certain pole voltage levels, it is challenging to balance the FC voltages for the entire modulation range operation required for induction motor drive applications. Hence a technique is proposed for FC voltage balancing by adding a common-mode offset to the reference voltage. This improves the DC bus utilization of the proposed inverter up to 0.63 times the dc-link voltage even at unity power factor load. Using MATLAB simulation, the effectiveness of this scheme is analyzed during different steady-state and transient conditions.

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