Scalable DC Microgrid Architecture with Phase Shifted Full Bridge Converter Based Power Management Unit

This paper documents a scalable dc microgrid architecture offering phase shifted full bridge (PSFB) converter based power management units (PMUs). There is a set of two PMUs connected to 36 V and 12 V batteries respectively. The energy source is a photo-voltaic (PV) array of 315 W maximum power. A source converter comprising a maximum power point tracking (MPPT) unit and a boost converter has been designed to generate a dc bus. The MPPT unit applies incremental conductance method to detect the peak power condition. A load converter comprises a set of parallely connected PMUs and batteries and PMUs are responsible for supplying power to the batteries and utility loads. PSFB converter in each PMU enables zero voltage transition by phase shifted pulse width modulation (PWM). In this paper the overall system is modeled and simulated on MATLAB/Simulink platform. A generic Lead acid battery model has been used and a voltage source converter (VSC) with an R-L load has been delivered power. The behavior of the system has been tested in both without and with load situations and the evaluated power efficiency values corroborate the reliability of the proposed design. The respective MATLAB/Simulink simulation waveforms and results are presented in this paper.