A Single-Phase Common-Ground Y-Source Grid-Connected Inverter

Impedance-source inverters have the characteristics of high reliability, high boosting capability, and flexible boosting methods, making them promising for applications in photovoltaic power generation systems. However, the parasitic capacitance of photovoltaic panels to ground can generate common-mode currents, leading to electromagnetic interference and safety concerns. Therefore, this paper proposes a new single-phase common-ground Y-source grid-connected inverter, which directly connects the negative pole of the DC source to the neutral point of the grid, thus eliminating common-mode currents in the topology. The paper analyzes the operating principle and voltage stresses of the new Y-source inverter. Finally, a 250W experimental prototype is designed, and the results prove the correctness of the analysis.