Abstract
In this paper, a delay-dependent method is adopted to deal with the continuous-discrete
operation mode and time delays induced by communication through open networks in load
frequency control (LFC) scheme. By using a novel technique, the design problem of digital PID -type
controller is converted into a design problem of static output feedback controller based on the
discrete-time system model. The controller gains are obtained using networked control system
theory, linear matrix inequality technique and cone complementarity linearization algorithm. By
taking the developed systematic procedures, digital PID -type controllers for LFC scheme of a
three-area interconnected power system are designed. Simulation results show that the designed
controllers provide better robustness against certain time delays than the existing controllers.