Robust frequency controller based on linear matric inequality for Parallel Islanded Microgrid

摘要

This paper presents a robust H ∞ control technique for anislanded microgrid in the presence of sudden changes in loadconditions. The proposed microgrid scheme consists of a parallelconnected inverter with distributed generations. When the load issuddenly changed the frequency deviates from its nominal value.The objective is to design a robust frequency droop controller inorder to achieve the frequency at nominal values without usingany secondary controller and communication systems whileimproving power sharing accuracy. Small signal modeling of thepower system is designed for the formulation of the problem andthe H ∞ optimal linear matrix inequality technique is applied inorder to achieve the objectives. The proposed controller has beentested with the MATLAB/ SimPowerSytem toolbox.