A novel multilevel inverter topology based on multi-winding multi-tapped transformers for improved wave shape requirements

Abstract

The present work proposes a simple cost effective multilevel topology for generating high quality sinusoidal AC waveform based onmulti-tapped multi-winding transformer switching technique. Multi-winding multi-tapped transformers are used to aid the multi-level switching process which guarantees a large number of intermediate switching levels. Each secondary tapping can act as a separate DC source derived from the single DC supply input to feed the second transformer. The proposed topology can generate 27 switching states by using only 8 switches and 3 full bridge diode rectifiers. The basic working principle is based on the selective addition and subtraction of magnetic flux in the transformer core. Although the mathematical modeling of multi-winding multi-tapped transformer is slightly complex, the resulting circuit complexity reduces when compared to the conventional topologies like diode clamped, capacitor clamped and cascaded multilevel inverters. The present work uses PSPICE and MATLABmodeling techniques to simulate the entire system using synthesized multi-winding multi-tapped transformer models. Also the proposed system has superior quality performance characteristics when compared to the conventional topologies, due to its ability to avoid major drawbacks like capacitor voltage unbalancing, common mode voltage stresses at the load end and the requirement of large filters to avoid the presence of harmonic frequencies at the output.Index Terms-Multi-winding multi tapped transformer, multilevel inverter, Common mode voltage, PSICE modeling

A new scheme of symmetric multilevel inverter with reduced number of circuit devices

“…The basic multilevel converters are assorted to 3 configurations: diode clamped (DCM), flaying capacitor (FCM) and cascaded H-Bridge (CHB) multilevel inverter. Each subdivision has its own advantage and disadvantages, i.e DCM have noticeable problems with unequal current stresses and voltage unbalancing [11]. Flying capacitor multilevel inverters are less popular in industrial applications, because of their higher switching frequency that is needed to maintain the capacitor voltages balanced and also the requirement of the FC initial voltages [12].…”