MOSFET-switch-based transformerless single-phase grid-tied inverter for PV systemsMOSFET-switch-based transformerless single-phase grid-tied inverter for PV systems Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2023-05-042022enThis work was supported in part by the program “Bilateral and Multilateral Research & Technology Co-operation between Greece and China” under Grant 2017YFE0134300 and Grant eSOLAR/T7ΔKI-00066.Nonisolated photovoltaic (PV) inverters based on a single high-frequency MOSFET power switch have become more and more popular recently. Among these topologies, the conventional buck–boost inverter is fairly achievable but has low efficiency, whereas the buck with boost inverter has the main drawback that its circuit includes too many devices. In order to outperform these topologies, a new MOSFET-switch-based transformerless inverter topology sharing one common ground between the PV source and the grid is presented in this article. The inverter experiences zero leakage current and only one energy-regulating inductor is equipped. The basic principle of operation is studied based on an equivalent circuit analysis. Moreover, the control strategy adopting dead-beat controller for the proposed inverter is designed and introduced in detail. Finally, a 110-V/50-Hz/500-W prototype is built up to test the correctness of the theoretical analysis. According to the measurement results, the efficiency of the prototype is 98.81% and 95.89% in light- and full-load situations, respectively. According to the experimental results, it can be verified that the proposed dc/ac inverter exhibits satisfactory steady-state and transient performance.http://creativecommons.org/licenses/by/4.0/IEEE Journal of Emerging and Selected Topics in Power Electronics1043830-3839 Gao Ning Jin Zhigang Wang Houqing Wu Weimin Koutroulis Eftychios Κουτρουλης Ευτυχιος Chung Henry Blaabjerg, Frede, 1963- Institute of Electrical and Electronics Engineers Buck–boost Dead-beat control (DBC) Grid-tied inverter Leakage current Transformerless