Extension of the Injected-Absorbed-Current Method Applied to DC–DC Converters With Input Filter, Output Postfilter, and Feedforward Compensations

In railway applications, it is common to use an LC filter connected between the catenary and the input port of the main converter of the auxiliary and traction systems. In addition, in the auxiliary systems, there is a converter operating as a battery charger, which requires a very low ripple in the output current and output voltage, so a postfilter may be placed at the output port of the c...