Stability criteria for load frequency control systems with communication delays and packet dropout

Due to increasing use of open communication channels for electric power systems, delay and packet dropout are common phenomena which lead the system to the verge of instability. This paper explores the delay-dependent stability for single area power system load frequency control (LFC) models installed with optimal controller considering both time delay and packet dropout. The maximum delay bound is found using Lyaponuv theory and free-weighting-matrix (FWM) approach. Simulations performed validate the effectiveness of the criterion used.