Four-Switch Common-Grounded Single-Phase Buck-Boost Non-Isolated PV Inverter

As the conventional non-isolated photovoltaic inverters all have low voltage gain and the leakage current issues, a transformerless common-grounded inverter with a relatively higher boosting ability is introduced. The suggested inverter comprises of a conventional boost converter and a buck inverter and is suitable for photovoltaic applications. The proposed inverter provides a solid connection in the negative port between the DC input power and the output load, thus eliminating the leakage current in the photovoltaic systems. Also, the introduced inverter has a higher input-to-output voltage ratio than other converters named semi-quasi-z-source and half-z-source converters. Employing the CBB capacitors increases the reliability of the suggested inverter and prolongs its service life. The working principle of the suggested inverter is elaborated in detail. The control strategy applied is ordinary and the proposed inverter is a single-level topology during the switching period. Finally, the simulation model is built in Matlab/Simulink platform, so the performance of inverter can be verified.