Research on a novel buck-boost converter for wind turbine systems

For converter-based wind turbine systems in grid-connected applications as distributed generators (DG), variable sources often cause wide changes in the converter input voltage above and below the output ac voltage, thus demanding a buck-boost operation of converters. Many traditional full-bridge buck converters, two-stage converters and single-stage buck-boost converters either have complex structure or have limited range of input dc voltage. The authors have proposed and developed an innovative single-phase, single-stage, flyback-based, buck-boost converter for renewable energy systems, especially for wind turbine 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 converter for grid-connected applications.