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Natural Space Vector Modulation in Six-Step Voltage Source Inverters

R.De Four, T.Wadi

This paper presents the existence of natural space vector modulation occurring between adjacent switching space vectors in quasi-square wave voltage source inverters. This natural space vector modulation is responsible for the hexagonal trajectory of the rotating resultant voltage space vector which is produced by the referral of the instantaneous line or phase voltage quantities to the drive’s virtual magnetic axes. Space vector rotation, which gives rise to the hexagonal trajectory only occur between switching states when the instantaneous line or phase voltages are undergoing changes in magnitude. The theoretical approach undertaken to develop the concept of natural space vector modulation is also supported with experimental results and fully support the well-known theory of space vector modulation.