A Novel Single-Phase Common-Grounded Converter Based on Switched-Capacitor

This article presents a new common grounded converter based on a switched capacitor. The converter can be used as a suitable interface for single-phase ac or two-wire dc grids. The direct connection between the negative terminal of the input voltage source and the null terminal of the output source enables the elimination of the leakage current in renewable energy systems, especially in photovoltaic power generation. The proposed topology offers voltage-boosting capability, so there is no need for an additional boost converter and it is possible to inject power into the grid at dc input voltages lower than the peak value of the output voltage, which helps improve the efficiency of the converter. In addition, the proposed topology has the ability to handle reverse current, hence, it feeds non-unity power factor loads. The operating modes and design of passive components are described in detail. The performance and advantages of the proposed converter are compared with other converters. Finally, through the experiment on a (3.78 kW/7 kW) converter, the performance of the proposed converter is validated.