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This paper presents an adaptive load frequency control technique in both of isolated microgrid power system and two interconnected microgrids (MGs). A modified Jaya optimization method is used to make online tuning of the area controller. The Balloon Effect (BE) modification is designed to increase the sensitivity of the Jaya algorithm to both of the system load disturbance and parameters variations. In Jaya with BE technique, the objective function (OF) is affected by the on-time system problems. Communication delay time is considered in the dynamic model of interconnected MGs. System with proposed adaptive control method has been tested in several scenarios including step and variable load demand and parameters variations. Simulation results using Matlab software show that the proposed adaptive controller tuned by Jaya + BE technique provides better performance of frequency control than other methods such as conventional controller or adaptive one tuned by classical Jaya algorithm. [ABSTRACT FROM AUTHOR]