Assessment of Battery Energy Storage System with Hybrid Renewable Energy Sources to Voltage Control of Islanded Microgrid Considering Demand-Side Management Capability

Abstract

To address the issue of voltage instability in the stand-alone microgrid structure, the paper presents control algorithm of energy storage system that can support the microgrid network at the time of sudden variation in load. The incorporation of battery module into the microgrid network strengthens the overall structure as it features high energy density. A control strategy is devised that establishes power delivery from the battery unit, and it also manages the status of state of charge (SOC) of battery. The delivery of power from battery structure is solely dependent on two variables: first the voltage established by the wind energy, PV and battery unit, i.e. the voltage Vdc. The second variable comprises the status of SOC of battery module. The paper also presents the process of demand-side management, and voltage customization control strategy is adopted to harness the power. The control mechanism of DC–AC microgrid incorporates voltage droop algorithm to retain the power. The demand-side management is the consequence of coordinated control strategy of battery module and stand-alone microgrid network. The microgrid topology and devised control framework of energy storage system are intertwined to establish the desired voltage and make the autonomous structure sturdy and robust in case of voltage perturbation. The standards of IEEE 1547 allow to employ conservative voltage regulation, and the proposed work of demand-side management fulfils the standard. The effectiveness of the devised control strategy is demonstrated through MATLAB simulation, and different cases are included to validate the proposed work.