Enhancement of voltage stability in an interconnected network using unified power flow controller

Abstract

In this paper, the optimal placement of Unified Power Flow Controllers (UPFC) in a large-scale transmission network in order to improve the loadability margin was considered. In other to achieve this aim, the Line Stability Factor (LQP) as a technique for the optimal location of UPFC in the IEEE 14-bus network and 56-bus Nigerian national grid was adopted. The power injection model for the UPFC was employed to secure improvements in the loading margin of the IEEE 14-bus network and 56-bus Nigerian national grid system. Continuation power flow was used to assess the effect of UPFC on the loadability margin. Steady-state simulations using Power System Analysis Toolbox (PSAT) on MATLAB was applied to determine the effectiveness of placing UPFC between bus 13 and bus 14 in the IEEE 14-bus network and between bus 44 (Ikot-Ekpene) and bus 56 (Odukpani) in the 56-bus Nigerian national grid system. The results showed that the loadability margin increased by 8.52 % after UPFC was optimally placed in the IEEE 14-bus network and increased by 195.5 % after UPFC was optimally placed in the 56-bus Nigerian national grid system. Thus, these enhance the voltage stability of both network and utilizing the network efficiently.

Modified brain storming optimization technique for transient stability improvement of SVC controller for a two machine system

“…To circumvent the challenges posed by the present electrical grid network researchers have introduced power electronic based devices known as flexible AC transmission systems (FACTS) with faster response time (Araga and Airoboman, 2021;Kamari et al, 2020). FACTS controller not only facilitates control of electrical grid network but also enhances damping of unwanted signals, revives system stability, attains operational flexibility, enhances financial profit (Ali and Abd-Elazim, 2013;Shahgholian and Movahedi, 2016).…”