Efficient fuzzy logic load-frequency controller

This paper investigates an application of the fuzzy logic technique for designing the load-frequency control system to damp the frequency and tic line power oscillations due to different load disturbances. The proposed fuzzy load-frequency controller, called a two layered fuzzy controller, consists of two layers. The first one is called the precompensator, which is used to generate and update the reference value of area control error (ACE), while the second one, called feedback fuzzy logic controller, makes the ACE decay to zero at steady state. The simulated power system consists of an integral control, two area load-frequency power system. The proposed two layered fuzzy logic controllers are designed for each area. The studied power system is subjected to a wide range of load disturbances to validate the effectiveness of the proposed controller. Moreover, a comparison between the power system frequency error responses using the conventional integral control system only and the proposed fuzzy controller is reported and obtained. The digital results prove the power of the present two layered fuzzy load-frequency controller over the conventional one in terms of fast response with less overshoot and small settling time. (C) 2002 Elsevier Science Ltd. All rights reserved.