Voltage Stability Improvement Of Power Transmission System Using UPFC, A Case Study Of 41-Bus Nigerian Power System Modeled In Neplan
Abstract
This thesis deals with voltage stability improvement of power transmission system in Nigeria using UPFC (Unified Power Flow Controller). The UPFC model is an application of a power electronics device used to control the power flow and improve voltage stability of a system under static condition. Power flow solutions is developed in NEPLAN using Newton-Raphson iterative method and simulated on the existing 41-bus 330KV Nigerian composite power network. The simulated results were achieved without and with UPFC. The absence of UPFC is the normal state of the Network before intervention. At this state, voltage violations occurred at yola, new haven, makurdi, maiduguri, jos, gombe and damaturu bus stations with percentage bus voltage of 68.34%, 88.66%, 88.51%, 70.89%, 80.17%, 75.27%, 76.38% respectively. With the presence of UPFC in-between gombe and damaturu bus stations, the changes in voltage profile were very significant in yola, new haven, makurdi, maiduguri, jos, gombe and damaturu bus stations with percentage bus voltage of 104.44%, 93.68%, 93.59%, 93.73%, 91.61%, 100.00% and 98.47% respectively. The presence of UPFC in the network reveals a significant reduction in line losses. The active line loss on the network was significantly reduced (from 431.787MW to 278.406MW); about 21% reduction, while reactive line loss came down with 70% reduction (from 6035.725MVAR to 1827.334MVAR), thereby providing additional capacities for the consumers. In this way, the efficiency of the system is enhanced while the prolonged and frequent voltage collapses in the transmission network are minimized.
Keywords
Unified Power Flow Controller (UPFC), Voltage Collapse, NEPLAN, Load Flow.
Citations
IRE Journals:
Ogheneovo Ibebe Obukowho , Engr. Dr. J. C. Onuegbu , Okwuelu Nnaemeka
"Voltage Stability Improvement Of Power Transmission System Using UPFC, A Case Study Of 41-Bus Nigerian Power System Modeled In Neplan" Iconic Research And Engineering Journals Volume 3 Issue 8 2020 Page 147-154
IEEE:
Ogheneovo Ibebe Obukowho , Engr. Dr. J. C. Onuegbu , Okwuelu Nnaemeka
"Voltage Stability Improvement Of Power Transmission System Using UPFC, A Case Study Of 41-Bus Nigerian Power System Modeled In Neplan" Iconic Research And Engineering Journals, 3(8)
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