Decentralized Output Feedback Stabilization Based on Modified Event-Trigger Scheme for Load Frequency Control of an Interconnected Microgrid

In this paper, a new method is presented to design a H-infinity decentralized static output feedback controller for the load frequency control problem. A power system which includes diesel generator, wind turbine, photovoltaic panel, and battery storage in each area is considered as case study. It is assumed that all control loops of the interconnected multi-area power system are closed under network communication. Thus, a networked control system model is extended for this class of large-scale system based on a modified event-triggered scheme; which decreases the bandwidth utilization. A Wirtinger inequality, which encompasses the Jensen inequality, is used to derive less conservative synthesis conditions in terms of linear matrix inequalities. Some sufficient conditions are presented to guarantee the stability and the H-infinity performance, based on LKF and integral estimation. Also, design of optimal output feedback controllers are based on stability conditions. The effectiveness of the proposed method is shown in simulation study for a four-area interconnected microgrid.