American Journal of Electrical and Electronic Engineering
ISSN (Print): 2328-7365 ISSN (Online): 2328-7357 Website: Editor-in-chief: Naima kaabouch
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American Journal of Electrical and Electronic Engineering. 2017, 5(4), 159-165
DOI: 10.12691/ajeee-5-4-6
Open AccessArticle

Load Flow Assessment of the Nigeria 330-kV Power System

Ignatius K. Okakwu1, , Emmanuel A. Ogujor1 and Patrick A. Oriaifo1

1Department of Electrical/Electronic Engineering, Faculty of Engineering, University of Benin, Benin City, Nigeria

Pub. Date: August 03, 2017

Cite this paper:
Ignatius K. Okakwu, Emmanuel A. Ogujor and Patrick A. Oriaifo. Load Flow Assessment of the Nigeria 330-kV Power System. American Journal of Electrical and Electronic Engineering. 2017; 5(4):159-165. doi: 10.12691/ajeee-5-4-6


The Nigerian 330kV grid network is characterized with major problems like voltage instability (voltage profile violation), long transmission lines, nature of transmission lines and high power losses which affect power generation and distribution systems. This paper considered the load-flow study of the Nigerian 330-kV consisting of 32 buses, 11 generating stations and 36 transmission lines. Newton-Raphson iteration technique was used to carry out the analysis because of its fast convergence nature as compared to other iterative techniques. The data used for the study is obtained from Power Holding Company of Nigeria (PHCN). MATLAB/SIMULINK software was used to carry out the simulations. The results obtained shows that some of the bus voltages lie outside the prescribed limit of 0.95-1.05 pu (313.5 – 346.5kV). These buses include buses 16 (Kano 0.8721pu), 17(Kaduna, 0.9046pu), 18(Jos, 0.8580pu), 19(Gombe 0.8735pu) and 21(Katampe, 0.9167pu). The total active power loss is 268.622MW and that of reactive power loss is 2247.42Mvar. It is therefore inferred from the results obtained that the existing Nigerian 330-kV grid network is fraught with high line losses that require compensation using reactive power supports such as Flexible Alternating Current Transmission Systems (FACTS) devices, for effective line utilization.

load flow Newton Raphson losses voltage transmission line

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