Effect Of communication delay on load frequency control application in autonomous hybrid power system

In wide area monitoring and control application, a time delay is introduced in the system while transmitting the control signal from control center to remote terminal unit. This paper presents the effect of communication delay on load frequency regulation in autonomous hybrid power system. An autonomous hybrid power system consisting of conventional thermal power system (TPS) integrated to distributed generation (DG) resources is considered. The DG system forms a combination of wind turbine generators (WTG), diesel engine generators (DEGs), fuel cell (FC), aqua-electrolyzer (AE) and battery energy storage system (BESS). Due to intermittent power output from wind generation, its combination in system leads to frequency and power mismatch. A robust H-infinity controller based on particle swarm optimization (PSO) and genetic algorithm (GA) is presented to maintain the frequency deviation profile. Robustness of controller is verified with different load conditions and parameter variation scenario. Simulation results show that PSO based H-infinity loop shaping controller achieves minimum frequency deviation compared to other controllers.