Study of a novel buck-boost inverter for photovoltaic systems

For inverter-based photovoltaic(PV) systems in grid-connected applications as distributed generators(DG), variable sources often cause wide changes in the inverter input voltage above and below the output voltage, thus demanding a buck-boost operation of inverters. Many traditional full-bridge buck inverters, two-stage inverters, single-stage buck-boost inverters either have complex structure or have limited range of input voltage. The authors have proposed and developed an innovative single-phase, single-stage, flyback-based, buck-boost inverter for renewable energy systems, especially for PV systems in grid-connected applications. This paper focuses on the analysis of the working principles, computer simulation of the operation, and design consideration of the inverter for grid-connected applications.