Distributed Generation based AC-DC-DC converter

In this paper a wind turbine Distributed Generation (DG) based AC-DC-DC converter is presented. AC-DC converter is used to supply constant or fixed DC voltage to the DC-DC converter, even in the presence of variations in input or source i.e. wind DG voltage. A new mathematical model has been derived for the above said system consisting DG, AC-DC and DC-DC converter (used for step-up voltage). A novel closed loop transfer function model for AC-DC converter and DC-DC converter is proposed. The control of AC-DC and DC-DC converter is implemented by indirect control strategy and cascaded scheme respectively. Using the derived mathematical model and the above said control, simulation studies have been carried in Matlab/Simulink. The results presented demonstrates excellent performance of overall system in terms of (i) control of voltage at the output of both the converters and (ii) power factor and harmonics at the input or source i.e. DG terminal of the AC-DC-DC converter.