Control of ILC in an Autonomous AC–DC Hybrid Microgrid with Unbalanced Nonlinear AC Loads

This article presents a multi objective control scheme for a bidirectional interlinking converter (ILC) of renewable energy based ac–dc hybrid microgrid. The prime focus of the power management algorithm is to feed the ac loads, and dc loads from ac source, and photovoltaic battery energy storage (BES), respectively. The second objective is to utilize the solar power to maximum capacity, by feeding it to dc load, BES, and ac load, in the given order of priority. The ac and dc subgrids operate independently, while supporting each other in case of overloading/under loading, thus reducing the amount of power reserve required in each, and eliminating the need of dump loads. The ANFIS-MN-based power quality control is integrated in order to ensure the total harmonics distortion of ac source current remains below 5% as per IEEE 519 standard, irrespective of the nature of load connected.

Index Terms—Battery, distributed generation, diesel generator (DG), interlinking converter (ILC), hybrid, microgrid, power management, power quality, photovoltaic (PV).