Energy Management System for Direct current (DC) Microgrid

Renewable energy-based direct current microgrids are becoming popular due to their higher energy efficiency than AC microgrids. In addition to the DC Microgrid not required more conversion systems and simple to connected to Battery systems In this paper we will propose effective energy management for a photovoltaic-based DC microgrid. The DC microgrid consist of a Photovoltaic Power System, a BSS to enhance the generation of power in the inability of a PV system, and a DC shunt motor connected as dynamic load. Battery storage system (BSS) helps to stabilize the system against the instability caused by stochastic nature of the renewable sources as well as demand variation within a microgrid To extract the maximum power from the PV array, we will implement a maximum power point tracking system (MPPTs). The BSS feeds the load through a bidirectional DC-DC buck-boost converter. The BSS is put into operation when the MG is in an emergency where the battery can provide backup when the PV system fails to generate the demand load under different weather conditions. The MG will be simulated using MATLAB/Simulink. We will exanimate the DC microgrid under various weather conditions to see the behavior of Battery storage system (BSS) when the power generation less the load demand and to see how the BSS helps the stabilization of the system against the instability caused by stochastic nature of the renewable sources as well as demand variation within a microgrid. We Will see the affects shown in electrical torque of DC shunt motor when the motor operates under full, half and quarter of the load.