AC Microgrid, distributed secondary control, reactive power sharing, droop control, consensus based strategy
Abstract
To correct the frequency and voltage deviations in the buses of an islanded AC microgrid (MG), generated by the droop control, and to achieve precision in the reactive power sharing between the distributed generation (DG) units, this work proposes a distributed fuzzy consensus secondary controller (FCSC), composed by a fuzzy controller (FC) in association with a consensus-based strategy (CBS). The FC is used in each unit to correct deviations in frequency and voltage, using local measurements. The CBS is composed by two algorithms that aim for precision in reactive power sharing. Through a narrowband communication channel, the units exchange reactive power information with neighboring. Simulation results are presented to validate the strategy in a MG composed by four units. The proposed FCSC reduces the frequency and voltage deviations and achieves the accuracy in the reactive power sharing for connection and disconnection of loads on the MG buses.
