Journal of Engineering Science and Technology Review 6 (5) (2013) 82 - 89 Research Article Genetic Algorithm Based Optimal Placement of Tcsc and Upfc in the Nigeria 330KV Integrated Transmission Line Network at Different Reactive Power Loadings O. Eseosa * and U. Roland Electrical/Electronic Engineering, Faculty of Engineering, University of Port Harcourt, Rivers State Received 2 February 2012; Accepted 20 November 2013 ___________________________________________________________________________________________ Abstract The Nigeria 330KV integrated power network consisting of 52 buses, 64 transmission lines and sixteen generating stations was studied. The network was subjected to different reactive power loadings ranging from 25%, 50%, 75%, 100%, 125% and 150% respectively with and without UPFC and TCSC FACTS devices using Newton-Raphson power flow algorithm and Genetic Algorithm (GA) for optimally locating these devices on the network. The heavily loaded active power lines were identified. The heavily loaded active power lines are thirteen (13). These include: Katampe- Shiroro, Akangba-Ikejawest, Aiyede-Oshogbo, Alaoji-Onitsha, Egbin-ikejawest, Jebba-Oshogbo, Jebba-Shiroro, Jos- Makurdi, Kaduna-Shiroro, Kaduna-Kano, Ajaokuta-Benin, Benin-Ikejawest, and Benin-Onitsha. The ten(10) heavily loaded reactive power lines include: B-Kebbi-Kainji, Benin-Oshogbo, Benin-Egbin, Benin-Sapele, Damaturu-Gombe, Damaturu-Maiduguri, Gombe-Yola, Jalingo-Yola, Ikeja West-Oshogbo and Jos-New Haven. Weak buses were New- Haven(0.9201pu),Damaturu (0.9283pu), Gombe (0.9405pu), Maiduguri(0.9425pu), Makurdi (0.9260pu), Jalingo (0.9354pu),Erunkan(0.9314pu) and Jos (0.9461pu).Ten(10) heavily loaded reactive power lines include:B-Kebbi-Kainji, Benin-Oshogbo, Benin-Egbin, Benin-Sapele, Damaturu-Gombe, Damaturu-Maiduguri, Gombe-Yola, Jalingo-Yola, Ikeja West-Oshogbo and Jos-New Haven. Using GA for optimal location of these devices, eight (8) of the thirteen (13) lines were installed with UPFC. These are Akangba-Ikejawest, Alaoji-Onitsha, Jebba-Oshogbo, Jos-Makurdi, Kaduna-Kano, Ajaokuta-Benin, Benin-Ikeja west, and Benin-Onitsha . Also of the eight (8) weak buses six (6) had UPFC and the improved bus voltage values are Damaturu (0.9983pu), Gombe (0.9751 pu), Maiduguri (0.9815 pu), Makurdi (0.9804 pu), Jalingo (0.9541 pu) and Jos (0.9646 pu). Six (6) TCSC devices were incorporated on the ten (10) heavily loaded lines, which include Ikeja West-Oshogbo, Damaturu-Maiduguri, Gombe-Yola, Jos-New Haven, Benin-Oshogbo and B- Kebbi-Kainji. Comparison was made between the power losses with and without FACTS devices at the various percentage loadings. Real and active power losses. Keywords: Antenna array, particle swarm optimization, phased array. __________________________________________________________________________________________ 1. Introduction Flexible Alternating Current Transmission Systems (FACTS) Devices use power electronic technology for effective control of electrical quantities, such as active and reactive power, phase angles and bus voltages, line impedances and terminal voltages, for the overall improvement of power quality in the network. The use of these devices allows for effective utilization of power system network at the generation, transmission and distribution stations and ensures power systems stability even when the network is subjected to excess active and reactive loadings(1). Assessment of the impact of FACTS Devices on power system network were studied in (2, 3, 4 and 5), to increase power transfer over transmission lines. The optimal location and placement of these devices in power system network using genetic algorithm for optimization and increased system loadings were studied in (6, 7, 8, 9 and 13). The aim of this work is to optimally locate FACTS (Unified Power Flow Controllers (UPFC) and the Thyristor Controlled Series Controllers (TCSC) devices in the Nigeria Jestr JOURNAL OF Engineering Science and Technology Review www.jestr.org ______________ * E-mail address: oomorogiuwa@yahoo.com ISSN: 1791-2377 © 2013 Kavala Institute of Technology. All rights reserved.