JPS_V1_N2_RP4 S. Praveena B. Suresh Kumar K.P. Krishna Prasad Journal on Power Systems Engineering 2322–0376 1 2 37 45 Hybrid Active Power Filters (HAPF), Multiobjective Optimization, Particle Swarm Optimization (PSO), Total Harmonic Distortion (THD), Power Factor, Reactive Power This paper proposes an optimal design method for an hybrid active power filters (HAPFs) set at high voltage levels to satisfy the requirements of Harmonic filtering, Power factor correction and reactive power compensation for Different Loads to Enhance Power Quality Using PSO [16]-[19]. Multi objective Optimization models for HAPF were constructed. Detuning effects and faults were also considered by constructing Constraints during the optimal process, which improved the reliability and practicability of the designed filters. Furthermore, the Particle swarm optimization algorithm was developed for searching an optimal solution of planning of filters. May - July 2013 Copyright © 2013 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=23640