Topology and circuit analysis of photovoltaic module integrated inverters

Abstract

Special requirements on the system structure, components selection and converter topology of the Module Integrated Inverters (Converters) for PV applications are considered. Under discussion are the features of usage of different converter topologies in photovoltaics, including buck, boost, forward, flyback converters. Examples are studied of using Silicon Carbide junction field-effect transistors in PV inverters and their influence on the inverter schematics. The single-stage Module Integrated Inverter (Solar Microinverter SMI-01) has been designed and fabricated in the frame of this work. The developed microinverter uses the interleaved flyback topology and is intended for integration in PV modules up to 240W. It has the following parameters: input voltage - 30 ÷ 48V, maximum system voltage - 600V, efficiency - 96%, output current THD - 4.5%, input/output isolation, dimensions - 220 x 150 x 56 mm. Microinverter is traced on the 4-layer PCB and placed in the IP65 case.