Transformerless DC-DC converter with high voltage gain based on a switched-inductor structure applied to photovoltaic systems

Abstract

In photovoltaic (PV) systems, high step-up dc-dc converters are required to manage the power flow. Since the output voltage of photovoltaic source is lower than the grid voltage level, dc-dc converters with high voltage gain are the solution in transformerless topologies. A high step-up dc-dc Ćuk converter with switched-inductor is proposed in this paper. The presented topology is designed to application in current source inverters (CSI) and unfolding inverters. Furthermore, to validate theoretical analysis, a 200W prototype is implemented. Lastly, a dc rectified sinusoidal output current modulation is performed to validate its application in unfolding inverters.