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This is the author accepted manuscript. The final version is available from IET via the DOI in this record.8th IET international conference on Power Electronics, Machines and Drives, 19-21 April 2016, Glasgow, Scotland, UKIn an islanded AC microgrid consisting of renewable energy sources, battery, and load, the battery balances the difference\udbetween power generated by renewable sources and that consumed by the load. However, battery charging capacity is\udlimited and its state of charge needs to be maintained within the safety limits. Furthermore, battery has limited maximum\udcharging and discharging power. This paper proposes a controller based on fuzzy logic to prevent the battery state of\udcharge and charging/discharging power from exceeding their limits regardless of variations in load and intermittent power\udof renewable sources. The microgrid considered in this paper consists of PV, battery, load and auxiliary supplementary\udunit. The fuzzy logic controller alters the AC bus frequency which is used by the local controllers of the parallel units to curtail the power generated by PV or to supplement power from the auxiliary unit. The main merits of the proposed\udcontroller are simplicity and easiness of implementation without the need for any communication links between the\udparallel units. Matlab/Simulink results are presented to validate the performance of the proposed controller.The work is financially supported by the Government of Oman, which provides a PhD grant for Rashid Al Badwawi. Also, the work is supported by EPSRC-DST funded project: Reliable and Efficient System for Community Energy Solutions (RESCUES- EP/K03619X/1)

Power Management of AC Islanded Microgrids using Fuzzy Logic