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A Solid State Transformer Integrating Distributed Generation and Storage

Ponraj.T, Alex george

The development of a Solid State Transformer (SST) that incorporates a DC-DC multiport converter to combine both photovoltaic (PV) power generation and battery energy storage. The DC-DC stage is based on a quad active-bridge (QAB) converter which not merely provides isolation for the load, but also for the PV and storage. The AC-DC stage is implemented with a pulse-width-modulated (PWM) single phase rectifier. Terminology to determine the power rating of the MAB ports is also derived. The QAB demanded power is calculated at the QAB controls and then fed into the rectifier controls in order to minimize the effect of the interface between the two SST stages. The voltage performance of the designed control loops based on the proposed control strategies are verified through extensive simulation of the SST average and switching models.The implementation of the virtual image as been made using MATLAB