VARIABLE-STRUCTURE LOAD FREQUENCY CONTROLLERS FOR MULTIAREA POWER-SYSTEMS

In this paper, variable structure load frequency controllers (VSLFC) a re proposed for interconnected power systems. Two designs are presente d: the optimal variable structure load frequency controller (OVSLFC) a nd the pole placement variable structure load frequency controller (PP VSLFC). The choice of the controllers switching vectors is based on lo cal information and accessible state variables. The effectiveness of t he proposed controllers is demonstrated through their application to t wo-area and three-area interconnected power systems. The results revea l that there is a significant improvement in the system dynamic perfor mance with VSLFC over that with an integral controller. Moreover, the performance of the system using the proposed controllers was found to be quite insensitive to the system parameters uncertainties.