INTERNATIONAL RESEARCH JOURNAL OF MATHEMATICS, ENGINEERING & IT Volume -1, Issue-4 (August 2014) ISSN: (2349-0322) A Monthly Double-Blind Peer Reviewed Refereed Open Access International e-Journal - Included in the International Serial Directories. International Research Journal of Mathematics, Engineering and Applied Sciences (IRJMEIT) Website: www.aarf.asia. Email: editoraarf@gmail.com , editor@aarf.asia Page 39 LOAD FLOW STUDIES ON NIGERIA 330KV NATIONAL GRID SYSTEM, USING NEWTON-RAPHSON’S METHOD IBEKWE, B.E. Department of Electrical and Electronic Engineering, Enugu State University of Science and Technology, Enugu Nigeria Nwobodo Harmony Nnenna Department of Computer Engineering, Enugu State University of Science and Technology, Enugu Nigeria Engr. Eyisi R.O. Department of Electrical/Electronic & Computer Engineering, Faculty of Engineering & Technology, Federal University Ndufu Alike Ikwo (FUNAI) Ebonyi State ABSTRACT Reactive power and voltage control constitute part of the major challenges in power system industry. Compensation in power system is very essential to eradicate the problem of constant power failure and outage in Nigeria power system. In this paper, the Nigerian 330KV, 30-bus system network is considered. Newton-Raphson‟s solution method was employed to carry out the analysis because of its sparisty, fast convergence and simplicity attributes compared to other solution methods. Using the relevant data, MATLAB/SIMULINK software was used to carry out the simulation analysis and the results obtained showed that bus voltages outside the statutory limit of 0.95 < Vi < 1.05 p.u are: bus 14 (Jos) with value of 0.9359 p.u, bus 17 (Gombe) 0.9175 p.u, bus 19 (Maiduguri) 0.9106 p.u, bus 22 (Kano) 0.8849 p.u, bus 28 (Berni -Kebbi) -0.734 p.u, bus 3 (Okpai) 1.090 p.u and bus 29 (Kaduna) 0.9880 p.u while bus 30 (Makurdi) gave the value 0.8247 p.u under normal uncompensated condition. KEYWORDS: Nigerian 330KV network, Newton-Raphson‟s method, compensation, reactive power and voltage control.