Battery Management System for Microgrids

Abstract

A novel approach of project is to model and control of a battery management system used in microgrid.
The system composed of photovoltaic array and battery. The photovoltaic array normally uses a maximum power point
tracking (MPPT) technique to continuously deliver the highest power to the load, when there are irradiation and
temperature. The disadvantage of photovoltaic energy is that photovoltaic output power depends upon weather
condition and cell temperature making it an uncontrollable source. To make the system controllable, the battery is
considered. This battery compensate the load variations when solar power is damping in nature.
System has two operation modes, the unit-power control (UPC) mode and the feeder-flow control (FFC) mode,
applied to hybrid system. When load is light, the UPC mode is selected. In UPC mode variation in load demands are
compensated by the main grid because the hybrid source output is regulated to reference power. In FFC mode feeder
flow is regulated to a constant power, the extra load demand is picked up by hybrid sources and hence feeder reference
power must be known. The system can maximize the generated power when load is heavy and minimizes the load
shedding area.
The proposed operating strategies with flexible operation mode change always operates the photovoltaic array at
maximum output power and battery in its high efficiency performance band, thus improving the performance of system
operation, enhance system stability, decreasing the number of operating mode changes in the MATLAB Simulink
environment.