Nigeria power transmission system requirescontinuous up-grading and expansion in order to cater for the need of ever growing power demand. This paper investigated the improvement of reactive power and voltage control using Distributed Flexible Alternating Current Transmission System (D-FACTS) devices in Nigeria 330kV transmission network so as to avoid deficiency of reactive power support, voltage violation/collapse, limit congestion and loop flows, improve assets utilization and to enhance the overall reliability of the network. Six selected 330kV transmission lines across the six geo-political zones in Nigeria were simulated for bus voltage improvement and reactive power support, without and with insertion of multiple D-FACTS devices in Nigeria 41bus system under different scenarios of geo-political zones.The simulations were done in Power World environment. Newton Raphson?s Load flow method was used for A.C. load flow analysis. At the end, it was found that installation of multiple D-FACTS devices on Nigeria 330kV transmission lines for coupled control of reactive power and voltages at various buses/locations of the network had improved reactive power flow, improved voltage magnitude, improved the reliability, controllability,reduced losses and improved transfer capacity of the existing transmission linesas it would in any other physical electric network. In this thesis, D-FACTS devices had successfully overcome the limitations/barriers of lumped solutions of conventional FACTS devices. It also served as most cost-effective alternative to other sources of reactive powerinjection and absorption, including voltage control or modulation along the existing transmission lines. The end results were satisfactorily achieved as the reactive power and voltage profile of the network became efficiently, improved, stable and controllableasthe transmission grid proved smart, more reliable, fault tolerant and self-recoverable.
Voltage surge, Reliability, Fault tolerant, Self-recoverable, Off-peak period, Distributed solution, Transmission lines, reactive compensation.
Ezechukwu O. A. , Ebune R. U. , Aneke J. I. "IMPROVEMENT OF REACTIVE POWER AND VOLTAGE CONTROL WITH D-FACTS DEVICES IN NIGERIA SUPER GRID SYSTEM" Iconic Research And Engineering Journals Volume 2 Issue 4 2018 Page 87-93
Ezechukwu O. A. , Ebune R. U. , Aneke J. I. "IMPROVEMENT OF REACTIVE POWER AND VOLTAGE CONTROL WITH D-FACTS DEVICES IN NIGERIA SUPER GRID SYSTEM" Iconic Research And Engineering Journals, 2(4)