American Journal of Applied Sciences

Optimal Decentralized Load Frequency Control Using HPSO Algorithms in Deregulated Power Systems

Seyed Abbas Taher, Reza Hematti, Ali Abdolalipour and Seyed Hadi Tabei

DOI : 10.3844/ajassp.2008.1167.1174

American Journal of Applied Sciences

Volume 5, Issue 9

Pages 1167-1174


Load Frequency Control (LFC) is one the most important issues in electrical power system design/operation and is becoming much more significant recently with increasing size, changing structure and complexity in interconnected power systems. In practice LFC systems use simple Proportional-Integral (PI) or Integral (I) controllers. However, since the PI or I control parameters are usually tuned based on classical or trial-and-error approaches, they are incapable of obtaining good dynamic performance for various load changes scenarios in multi-area power system. For this reason, in this study the PI and I control parameters are tuned based on Hybrid Particle Swarm Optimization (HPSO) algorithm method for LFC control in two-area power system. Because HPSO is an optimization method, therefore, in the uncertainty area of controller parameters, finds the best parameters for controller and obtained controller is an optimal controller. A two-area power system example is given to illustrate proposed methods. To show effectiveness of proposed method and compare the performance of optimized PI and I type controllers, several time-domain simulation for various load changes scenarios are presented. Simulation results emphasis on the better performance of optimized PI controller in compared to optimized I controller in LFC.


© 2008 Seyed Abbas Taher, Reza Hematti, Ali Abdolalipour and Seyed Hadi Tabei. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.