A novel single phase transformerless inverter topology for PV applications

Abstract

A key stage of photovoltaic (PV) systems is the inverter connected at the chain's end. Inverters dedicated to PV systems could be classified into two major topologies: (i) those equipped by a transformer and (ii) those without a transformer, the so-called: transformerless inverters (TIs). The latter were recognized to be more efficient in terms of energy efficiency and compactness. In spite of these performances, the integration of TIs in PV systems is compromised by some shortcomings, such as the circulation of a leakage current due to the absence of the galvanic isolation. This work considers a new single phase TI topology dedicated to PV systems. Beyond its energy efficiency capability and its null zero-crossing distortion, it has the merit to eradicate the leakage current. Following, the analysis of its operating sequences, the proposed TI topology is simulated in order to highlight its effectiveness.