Analyses and simulation of three-phase MLI with high value of resolution per switch employing SVM control scheme

This paper proposes a three-phase voltage source inverter employing space vector modulation control scheme. The proposed inverter is a modular type that can increase its level by adding more cells to each arm. The phase `a´ arm consists of `m´ cells and each cell consists of single isolated dc source with two switches. Switches are connected in such a way that one switch is in series with the isolated capacitor and the second switch is connected in parallel with the series dc source and the series switch. In order to increase the resolution of the proposed inverter, isolated dc source voltages with different values are used in such a way that the dc source voltage of a cell equals half of the next cell dc source voltage (V_dc, 2V_dc, 4V_dc, ...). A space vector modulation control technique is employed to generate the different output voltages. The proposed inverter is suitable for renewable energy applications, where many batteries with different values can be available. Analyses and simulation have been executed to validate the the proposed inverter. The proposed inverter has been compared with the existence latest counterpart inverter under the conditions of identical supply dc voltage and switching frequency. Some selected simulation results have been provided for validation.