Transmission Line Capacity Enhancement with Unified Power Flow Controller Considering Loadability Analysis

Abstract

This paper proposes transmission line capacity enhancement with optimal location and sizing of UPFC on IEEE 14-bus network. This is necessary because of the increase in load growth with every passing day without an equivalent increase of line capacity which has brought many power systems closer to their stability limit. The dynamic and practical application of this proposed method is achieved by increasing linearly, the loading factor (λ) from 1.25 to 1.50 of the base case value of 1.0 and then, its effect is investigated. In each of the increment, the power flow result is obtained using Newton-Raphson method, while the optimal location and sizing of UPFC are done using Grey Wolf Optimization (GWO) technique. The voltage deviation before and after the installation of the FACTS device is also studied at each load variation. This approach will help the bulk dispatcher of power to plan ahead so as to meet and supply the ever-growing in the demand for adequate and reliable power system as a result of population growth, improved living standards and technological advancement. The efficacy of the proposed method is verified on a standard IEEE 14-bus system. The simulation results show the effectiveness and suitable performance of the proposed methodology at enhancing transmission capacity and deferring or eliminating for transmission line upgrading.

Grey Wolf Optimizer Based Optimal Placement of Multiple Facts Devices in the Transmission System Under Dynamic Loading System

“…FACTS devices over the years have brought to bear, the perceptions that network instability and constraints can be solved successfully and promptly by deferring or eliminating the need for upgrading or building new transmission lines [2,3]. 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].…”

“…UPFC device is a versatile and adaptable FACTS controller. It provides an excellent adaption to recurrent changes of network operational conditions and enhances the usage of an existing network asset [2]. It is a device which simultaneously combines both shunt compensating and a phase shifting technology.…”

“…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. This increase in demand has not been adequately compensated by sufficient generation and transmission capacities, owing to economic, political and environmental constraints that limit the utility companies from expanding their generation and transmission facilities [1][2][3]. Therefore, the present-day researchers are focusing more attention on innovative solutions and technologies with improved energy planning and the use of smart technologies to better the system efficiency, stability and security [4,5].…”

“…In order to achieve the above stated objectives, the need to install a robust and environmental-friendly device in an existing transmission facilities to provide a better voltage and power flow control, system flexibility, improving power carrying capacity and superior power quality of the existing transmission assets is utmost important [6][7][8]. This has led to the application of power electronics based controlled devices known as Flexible AC Transmission System [2,8,9]. This device enhances network stability without changing the network topology [10,11].…”

“…Ageist Spider Monkey Optimization (ASMO) and a fuzzy-logic based procedure was deployed for optimal locations and sizing of TCSC and TCPST for voltage stability margin improvement and power losses reduction in the power sector [43]. A novel technique for optimal placement of UPFC to eliminate network overloading during single-line fault was investigated in [2,44].…”