LOAD FREQUENCY CONTROL USING MULTI VARIABLE CHARACTERISTIC LOCI METHOD IN POWER SYSTEMS

This paper describes a Multi Input Multi Output (MIMO) design method based on the Characteristic Loci (CL) to Load Frequency Control (LFC) of the power systems. The load frequency control problem has been a major subject in electrical power system design/operation and is becoming more significant recently with increasing size, changing structure and complexity in the interconnected power systems. In practice LFC systems use simple proportional integral controllers. However, since the PI control parameters are usually tuned based on the classical or trial-and-error approaches, they are incapable of obtaining good dynamic performance for a wide range of operation conditions and various load changes scenarios in multi-area power system. To solve this problem, in this paper the CL method is proposed. In addition for reducing compelxibility in computation, redefine input and output of system. The proposed method is tested on two area power system under various operating conditions .The simulation results show that the proposed CL design method controller achieves good performance even in the presence of Generation Rate Constraints (GRC) and is superior to the other controllers.