Experimental Validation of Wireless Load Sharing Method for Isolated AC Microgrids

The efficient integration of Distributed Generation (DG) systems, taking as main energy source the renewable energies is nowadays a great challenge. To integrate them into a whole power sharing system as a part of an autonomous micro grid, the Droops control is a local alternative to control the power interfaces such as voltage source inverters (VSI) in order to share the common load power and to supply frequency/voltage required by the load. The objective of this paper is the demonstration of a power sharing strategy achieved with a wireless master/slave load configuration. The strategy involves a Direct Droops (DDroops) control scheme for the master mode operation and an Inverse Droops (I-Droops) control scheme for the slave mode operation, this last following the frequency and the voltage imposed by the master VSI. The synchronization of VSIs, the signals estimation and the frequency tracking have been efficiently achieved using ADALINE network (Adaptive Linear Neuron). Experimental results using a real micro grid test bench with Field Programmable Gate Array embedded devices (FPGA) for the hardware implementation of each VSIs control demonstrate the validity of the strategy proposed.