Design of Decentralized Fuzzy Logic Load Frequency Controller

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K. A. Ellithy 1,* K.A. El-Metwally 2

1. Department of Electrical Engineering, Qatar University, Qatar

2. Department of Electrical Engineering, Cairo University, Cairo, Egypt

* Corresponding author.


Received: 17 Feb. 2011 / Revised: 3 Jun. 2011 / Accepted: 15 Aug. 2011 / Published: 8 Mar. 2012

Index Terms

Load Frequency Control, Generation Rate Constraints, Conventional Integral Control, Fuzzy Logic Control


This paper presents a novel approach for designing a decentralized controller for load frequency control of interconnected power areas. The proposed fuzzy logic load frequency controller (FLFC) has been designed to improve the dynamic performance of the frequency and tie line power under a sudden load change in the power areas. The effect of generation rate constraint (GRC) for both areas has been considered in the controller design. The proposed FLFC consists of two internal fuzzy logic controllers namely, the PD-like fuzzy logic controller and the PI-like fuzzy logic controller. The FLFC has been co-coordinated with the conventional integral controller. Time-domain simulations using MATALB/SIMULINK program has been performed to demonstrate the effectiveness of the proposed FLFC. The simulation results show that the proposed FLFC can provide good damping and reduce the overshoot even in the presence of the GRC.

Cite This Paper

K. A. Ellithy, K.A. El-Metwally, "Design of Decentralized Fuzzy Logic Load Frequency Controller", International Journal of Intelligent Systems and Applications(IJISA), vol.4, no.2, pp.66-75, 2012. DOI:10.5815/ijisa.2012.02.08


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