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Voltage Unbalance Elimination in Multilevel Inverter using Coupled Inductor and Feedback Control

Divya S, G.Umamaheswari

This paper deals with the voltage unbalance problem in multilevel inverters. Multilevel voltage source converters are the new trend in the power converter option for high-power applications. One of the major limitations of the multilevel converters is the voltage unbalance between different levels. The elimination of voltage unbalance in a single-phase five-level inverter which uses coupled inductors and feedback control, which can produce a five level output voltage with only one dc source. With this topology, splitting of the dc voltage is avoided, which eliminates the problem of voltage balancing in the circuit which was a prominent problem in the conventional topologies. The feedback control of the inverter is implemented using a PI controller. The six power switches used here have the same voltage stress and only one set of coupled inductors are adopted.