Fast Algorithm for Eliminating Common Mode Voltage in Dual Three-phase Inverter

In this paper, a novel fast algorithm for dual three-phase inverters with a focus on common mode voltage (CMV) elimination is proposed. By considering the operation of inverters, the occurrence of switching operation with minimum CMV can be found. Hence, one set of three-phase switching signals are analyzed and calculated, with their modulation being achieved by pulse modification and pulse complementarity. To introduce the proposed modulation technique, a simple but useful concept 'pulse modification theory' is summarized and fully employed. Then the modulation strategies for the second set of three-phases can be easily obtained through complementing pulses. All claims are validated through simulation and experimental results.