Modeling, Control and Analysis of Input-Series-Output-Parallel-Output-Series architecture with Common-Duty-Ratio and Input Filter

This paper introduces a new architecture for modular converters in railway applications and in general in high input voltage - high power applications. This topology consists of four Phase-shift Full Bridge converter which are connected in series at the input while in the output side every two of them are connected in parallel and then be connected in series. A stability analysis which is achieved through input voltage sharing is shown. A small-signal model of Input-Series-Output-Parallel-Output-Series architecture with common duty ratio control is presented. Considering the effect of the input filter over the modular converter, a linear controller is designed. Finally, simulation validates the theoretical predictions.