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This paper describes space vector modulation (SVM) techniques for different motor drive systems. Two three-phase topologies are compared from the viewpoints of switching sequences and the resultant voltage waveforms, i.e., an open-end winding motor fed by dual inverters and a conventional star-connected three-winding motor fed by a single inverter. In the dual inverter system, both the inverters are supplied by batteries with a 1:1 DC-bus voltage ratio, while in the single inverter system, the DC-DC converter is employed to supply the inverter. The simulation results compared with the single inverter system show that, with the identical motor speed command value, the dual inverter motor drive system can generate 9-level voltage waveforms which can suppress the total harmonic distortion (THD) of the voltage down to 35.86% and THD of the current down to 6.39%.

Space Vector Modulation of dual inverter motor drive compared with single inverter drive