IIARD International Institute of Academic Research and Development

International Journal of Engineering and Modern Technology (IJEMT )

E-ISSN 2504-8848
P-ISSN 2695-2149
VOL. 10 NO. 2 2024
DOI: https://doi.org/10.56201/ijemt.v10.no2.2024.pg83.106

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Stability Study of the Nigerian 330KV Integrated Power System Network: A Case Study of Benin Regional Control Centre

George, S. T.

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Abstract

The study examined the stability of existing Nigerian 330kV grid network of the Benin regional control centre which coordinates and monitors the grid network within the south-south and south- east region of Nigeria. Presently, the National grid consist of thirty (30) power generating stations, fifty six (56) buses and eighty (80) transmission lines. Due to the availability of natural gas, the Benin regional control centre is strategic and unique to the National grid as it consist of about seventeen (17) generating stations, 28 buses, and 30 transmission lines. The swing equation, equal area criterion and modified Euler’s method was used for the study and the network was modelled in Electrical Transient analyzer program (ETAP12.6) software to investigate the impact a three phase fault created 96km along Onitsha–Benin transmission line will have on the power system. The result obtained shows that at pre-fault (0.00-0.991 seconds), the frequency is within the acceptable limit of 50Hz ± 0.5%. During fault (1.001-1.191 seconds), the frequency was gradually moving out of its acceptable limit and there was violation of voltage statutory limits of 95%-105% until the oscillation was damped. The buses that were mostly affected are Sapele GS (217.1 KV), Delta GS (200.2 KV), Ihovbor GS (201.8 KV), Azura GS (201.8 KV), Okpai GS (213.5 KV) Benin TS (169.5 KV), Asaba TS (182.6 KV), Aladja TS (237 KV), and Onitsha TS (191 KV). At post-fault 1.210 seconds the fault is cleared. However if the fault is not cleared after 1.210 seconds, there will be loss of synchronism between the generating plants and the system will become unstable. The bus voltages after 1.210 seconds are Sapele GS (405.3 KV), Delta GS (365 KV), Ihovbor GS (366 KV), Azura GS (366 KV), Okpai GS (213.5 KV) Benin TS (372 KV), AladjaTS (370.9 KV), Asaba TS (341.9 KV) and Onitsha TS (191 KV).

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References:

Egeruoh,C.C (2012).Longterm transmission expansion planning for Nigeria deregulated power
system (Master dissertation) Deelft University of technology, Madrid.

Enemuoh, F.O (2012) Simulation modelling of voltage stability of an interconnected electric
power system network (Ph.D Thesis) University of Nigeria, Nsuka.

Glover, J.D., Sarma, M.S, Overbye, T.J (2012). Power system analysis and design (5thed. 200-
300).Wadsworth group,.Brookscole a division of Thomas learning centre.

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