DOI: 10.4018/IJEOE.2017040103 Copyright © 2017, IGI Global. Copying or distributing in print or electronic forms without written permission of IGI Global is prohibited. International Journal of Energy Optimization and Engineering Volume 6 • Issue 2 • April-June 2017 A Hybrid PSO-LEVY Flight Algorithm Based Fuzzy PID Controller for Automatic Generation Control of Multi Area Power Systems: Fuzzy Based Hybrid PSO for Automatic Generation Control Ajit Kumar Barisal, Veer Surendra Sai University of Technology, Burla, Odisha, India Tapas Kumar Panigrahi, IIIT, Bhubaneswar, Odisha, India Somanath Mishra, Veer Surendra Sai University of Technology, Burla, Odisha, India ABSTRACT This article presents a hybrid PSO with Levy flight algorithm (LFPSO) for optimization of the PID controllers and employed in automatic generation control (AGC) of nonlinear power system. The superiority of the proposed LFPSO approach has been demonstrated with comparing to recently published Lozi map-based chaotic optimization algorithm (LCOA) and Particle swarm optimization to solve load-frequency control (LFC) problem. It is found that the proposed LFPSO method has robust dynamic behavior in terms of settling times, overshoots and undershoots by varying the system parameters and loading conditions from their nominal values as well as size and locations of disturbance. Secondly, a three-area thermal power system is considered with nonlinear as Generation Rate Constraints (GRC) and outperforms to the results of Bacteria Foraging algorithm based integral controller as well as hybrid Differential Evolution and Particle Swarm Optimization based fuzzy PID controller for the similar power system. Finally, the proficiency of the proposed controller is also verified by random load patterns. KEYwORDS Automatic Generation Control, Multi Area Power System, Levy Flight, Fuzzy Logic Controller, Lozi Map- Based Chaotic Algorithm INTRODUCTION A modern power system consists of many areas and interconnected by tie lines. It is well known that the load demand varies every instant. For stable operation of the power system, the deviations in system frequency & tie-line power exchange must to be minimum. If the active power generated becomes less than the load power demand at any instant of time during sudden disturbances, the system frequency decreases and vice versa. The objective of an interconnected power system is 42