A New 7-Level Inverter for Active and Reactive Power Compensation Using PEV in Grid-Connected Applications

Typically, conventional multilevel inverters (MLI) have the disadvantage of being unable to step up the input voltage. Therefore, one type of three phase MLI with boost capacity is proposed. The proposed three-phase inverter is capable of generating seven levels (0, 1V dc, 2V dc, 3V dc, -1 V dc, -2V dc, -3V dc), while only one DC source and five capacitors are required for the three phase configuration. To facilitate analysis, a phase position pulse-width-modulation (PD-PWM) strategy is applied to control switches. And suitable switching modes are also selected to balance the voltage of capacitors. In order to verify and validate the proper operation of the proposed circuit configuration and the ability using plug-in electric vehicle (PVE) battery into grid, the system is simulated in PLECS. The results of simulation are provided to validate the feasibility of the proposed inverter.