Power Management of Solar based DC Microgrid System Enabled by Solid State Transformer

DC microgrid for solar based Photovoltaic (PV) application is picking up prominence because of its availability and potential to fulfil the future electricity needs. Power management control for this system is important to guarantee high use of sustainable sources and stable operation of system. Its intermittence nature increases the importance of power management for this system. In this paper a power management strategy for solar based DC microgrid (DCMG) enabled by solid state transformer (SST) is proposed. The power management is performed by controlling individual units, i.e. PV system is controlled by hill climbing perturb and observe (P&O) algorithm to operate at MPPT, Battery state of charge (SoC) is controlled by droop controlled algorithm, power in AC MG is controlled by hysteresis current control (HCC) method while, sliding mode control algorithm is employed to control the load connected to the DC MG. A MATLAB/Simulink DC microgrid model with integration of a PV array, battery and a load through SST was developed. The results are presented and discussed in this paper.