Abstract
The application of grey wolf optimization technique for multiple FACTS placement is presented in this paper for the reduction of total system losses and minimization of voltage deviation via optimal placement of Flexible AC Transmission System (FACTS) device. Grey wolf optimization (GWO) technique is inspired by social hierarchy and hunting behaviour of wolves and offers a right balance between exploration and exploitation during the search for global optimal. Series-shunt FACTS device; unified power flow controller (UPFC) is considered as a formidable device that can provides an alternative option for the flexible controllability and improvement of power transfer capability of a transmission lines. The analyses were conducted by increasing the number of UPFC in the network in order to evaluate the optimal number of FACTS devices that would give the least loss under maximum loading and contingency conditions. The efficacy of this proposed technique is demonstrated on 31-bus, 330 kV Nigeria National Grid (NNG) using MATLAB environment. The results show that optimal placement of FACTS device along with optimization technique provides a promising solution to the high power loss and voltage deviation bedevilling Nigeria National Grid.
Highlights
In recent years, the power system is witnessing an unprecedented and alarming increase in demand for quality and secure electrical energy, due to the population growth, rising standards of living and recursive increase in technological development under contingency and restructured market environment
The analyses were conducted by increasing the number of unified power flow controller (UPFC) in the network in order to evaluate the optimal number of Flexible AC Transmission System (FACTS) devices that would give the least loss under the three scenarios
Maximum loadability limit without contingency To determine the performance and optimal number of FACTS devices that can result in the lowest power loss in the network, Grey wolf optimization (GWO) algorithm was run on the network under 32.65 % loadability
Summary
The power system is witnessing an unprecedented and alarming increase in demand for quality and secure electrical energy, due to the population growth, rising standards of living and recursive increase in technological development under contingency and restructured market environment. Amidst the various well known FACTS devices, UPFC is the most commonly used, because of its unique ability to provide independent and/or simultaneous control of the bus voltage magnitude and active and reactive power flow through the transmission line where it is placed [12, 51].
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