Droop Control Strategy in Decentralized DC/AC Inverter-based Smartgrid for Power Balance

Microgrids represent a core component of future power systems, consisting of interconnected distributed generators (DGs), energy storing units, with multiple consumers functioning under coordinated command, often incorporating renewables. This paper introduces a decentralized power-balance control strategy for grid voltage and current for a smartgrid involving a virtual impedance droop controller. The proposed technique focuses on three parallel voltage source inverters responsible for sharing both residential and industrial loads. Virtual impedances are employed to mitigate the effects of fluctuating line impedances, thereby minimizing circulating voltages, currents, and imbalances in power distribution. This research evaluates the strengths and weaknesses of conventional droop control methods and suggests a decentralized, novel droop control for balancing active and reactive power among integrated multiple DG's, incorporating grid voltage (310 V), current (24.11 A), and frequency (45.95 Hz) control in OFF/ON- grid mode operation of smartgrid. The operational validity of the droop controller model is verified in real-time using MATLAB, showcasing robust performance under inductive behavior in an OFF -grid or ON-grid system.