An Approach for the Supervision and Management of Power for the Solar Photovoltaic and BESS Based DC Microgrid Integrated System

The paper presents the supervisory monitoring of sources like solar photovoltaic cell and battery energy storage system (BESS) for the various loading conditions in the DC micro-grid integrated system. The non-synchronization of power, control of frequency etc. are the advantages of DC- micro grid over AC system. The conventional control techniques like droop control, dc bus signaling control were unable to provide the robust solution in DC micro grid integrated system. This paper proposes a supervisory control technique for a microgrid comprising a number of PVs and batteries. The dc bus voltage is used as a measure for supply-demand power balance. Depending upon the magnitude of dc bus voltage, the control is divided into levels. The proposed technique divides dc bus voltage into three levels: Level 1, Level 2 and Level 3. Under normal operating conditions, there is a communication between different terminals of the microgrid, the microgrid operates in Level 1. The dc bus operates in Level 3 in case of abnormal conditions like sudden shedding or increase in loads or faults in PVs etc. Simulations are performed in MATLAB for validating the proposed research for the estimation of the various performance parameters.