A Three-Level Single Stage A-Source Inverter with the Ability to Generate Active Voltage Vector during Shoot-Through State

In this paper, as the boosting stage for a three-level inverter, a new modified configuration of A-source IN with two series outputs is proposed and connected to a 10-switches three-level inverter. Besides generating two outputs by a single IN, the proposed DC/AC inverter is able to apply an active voltage vector during the ST state. This capability improves the DC/AC voltage gain, increases the modulation index, and decreases the required ST time. The operation principles are described, and the steady-state relations are derived. It is compared with other magnetically coupled INs in terms of boost factor and voltage stress of switches. Considering the 10-switches three-level inverter as the front-end inverter, an adopted maximum boost strategy using the space vector modulation is developed targeting minimum ST time. The performance of the proposed topology is validated through the MATLAB-based simulations.

Keywords: Impedance source network, A-Source impedance network, multi-level inverter, maximum boost space vector, PWM.