Microgrid is a new paradigm for current and future energy distribution 
systems that enable renewable energy integration. The microgrid generally 
consists of multiple distributed generators interfacing with the grid through 
power inverters. When the islanded microgrids are concerned, it is essential 
to maintain the system stability and achieve load power sharing among the 
multiple parallel-connected distributed generation units. However, poor 
active and reactive power-sharing is expected due to the influence of 
impedance mismatch of the distributed generation feeders. The key 
objective of this work is to estimate the virtual impedance value to nullify 
the power-sharing errors without the need for communication links. A fuzzy 
logic controller is proposed to estimate the value for virtual impedance 
based on the instantaneous real and reactive power demands. The virtual 
impedance dynamically changes depending on the load demand to 
compensate for the feeder impedance mismatch, hence called adaptive 
virtual impedance. The proposed power-sharing control strategies are 
validated using Matlab/Simulink simulation under four operational 
scenarios. The proposed fuzzy controller provides precise reactive power 
sharing and helps to eliminate the need for communication links. In 
addition, it provides superior dynamic performance