A New Transformer-Less Common Grounded Three-Level Grid-Tied Inverter With Voltage Boosting Capability
Naser Vosoughi Kurdkandi, Milad Ghavipanjeh Marangalu, Sama Salehi Vala, Parham Mohseni, Amirreza Zarrin Gharehkoushan, Seyed Hossein Hosseini, Mehran Sabahi
Abstract
A new transformer-less three-level grid-tied inverter is proposed in this article. By employing the switched-capacitor (SC) modules, a new topology is derived. The proposed topology has some features which are high efficiency, the capability of voltage boosting without utilization of any additional boost stage, and suppressing the leakage current by using common grounded strategy. In this article, a peak current control is employed to generate the gate pulses of power semiconductor switches and adjustment of both active and reactive powers. By doing so, the grid injected current is controlled and adjusted to have a proper quality. The operation modes, design consideration, and a comparison with some recently proposed grid-connected topologies are done through this paper. Finally, the performance and feasibility of the proposed inverter are confirmed with a 500 W experimental prototype.