Improving the Transient Stability of Ajaokuta Bus in the Nigerian 330KV Transmission System Using Proportional Integral Based VSC-HVDC Method

Okolo C.C.¹ , Uduh E.J.² , Ezeugbor I.C.³ , Okwuelu N.⁴ , Sani O.M.⁵

Section:Research Paper, Product Type: Journal-Paper
Vol.7 , Issue.2 , pp.92-99, Jun-2020

Online published on Jun 30, 2020

Copyright © Okolo C.C., Uduh E.J., Ezeugbor I.C., Okwuelu N., Sani O.M. . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Improvement of the dynamic response of generators, within a power system, with the existence of various disturbances, has been a very serious challenge to the power system engineers and researchers. The application of intelligent Voltage Source Converter ? High Voltage Direct Current (VSC-HVDC) to enhance the transient stability of Nigerian 330kV transmission system was studied. PSAT environment was used to model Nigerian 330kV transmission network. The simulation of the system load flow was done. By obtaining the eigenvalue and damping ratio from the eigenvalue analysis of the system buses, one of the critical buses and transmission lines were determine. A balanced three-phase fault is hereby introduced in these critical buses and transmission lines of the network to obtain the current transient stability situation of the grid. This was achieved through what was obtained from the dynamic responses of the generators in Nigeria 330-kV grid/network at the point of introducing the fault. This shows clearly that one of the most critical buses is Ajaokuta bus and critical transmission line is Ajaokuta-Benin Transmission line within the network. The load flow analysis also shows that the system loses synchronism when the balanced three-phase fault was applied to these identified critical buses and lines. This implies that Nigeria 330-kV transmission network is on a bad state and requires urgent control measures with the aim of enhancing the stability margin of the network to avoid system collapse. The VSC-HVDC installation was done along to the critical line. The conventional PI method was used to control the parameters from the converter and inverter of the High Voltage Direct Current. MATLAB/PSAT software was used as the tool to do the simulations. When it was compared with the results of other similar, there was transient stability improvement. The obtained results showed that there is transient stability improvement when the PI controlled HVDC was installed. When compared with the results of other similar works of 28.57% transient stability improvement, it was observed through the dynamic response observed from the generators in the Nigeria 330-kV grid/network

Key-Words / Index Term :
Transient, Stability, Integral, Transmission, HVDC

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