Real Time Implementation of Fuzzy Based Charging-Discharging Controller for Lithium-ion Battery in Microgrid Applications

This paper presents the fuzzy based charging-discharging control technique of lithium-ion battery storage in microgrid application. Proposed fuzzy based scheme enabling the storage to charge or discharge based on the available power, load demand and battery SOC. Various controlling techniques have been implemented to evaluate and control the battery performance, which have the limitation of controlling overcharging or over-discharging, complexity in control and longer charging time. Besides, fuzzy controller is less complex, and faster, as it obviates the extra sensing components, requires no additional deep discharging and overcharging protection, and easy to implement due to the absence of mathematical calculation. Numerical simulations with the load demand and the generations demonstrate the effectiveness of the proposed charging-discharging controller strategy. The efficacy of the proposed controller is tested under certain load variation for real time application. Obtained experimental result shows that, the developed model can control the battery charging-discharging efficiently. Moreover, it is also seen from the output that, the battery state of charge does not go beyond the limit of the respective safe battery operating region (20% to 80%). Thus, the main contribution of this research is to develop an improved fuzzy model and thus implement the system for real time application to control the charging-discharging of the battery.