Voltage instability is mainly associated with the inability of the power system to maintain acceptable voltages at all buses in the network.
Consequently, the existing power transmission lines become more heavily loaded, and they must be operated closer to their maximum stability limits and for longer periods of time, resulting in a higher probability of voltage instability. Therefore, power utilities are compelled to maximize the use of their available resources. However, developing new systems is expensive and requires a considerable amount of time. To meet the increasing demand, new power system networks must be constructed or existing networks must be expanded. The demand for electricity has significantly increased in recent years. įunding: The authors would like to thank the Ministry of Higher Education of Malaysia for providing financial support under the research grant No.UM.C/HIR/MOHE/ENG/16001-00-D000024.Ĭompeting interests: The authors have declared that no competing interests exist. The power flow and dynamic data of the IEEE 14 bus system and IEEE 39 bus system networks can be found in.
#Power flow through a transmission line license#
This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are creditedĭata Availability: Simulations were conducted in a power system computer-aided design (PSCAD) software.The information of PSCAD license used to conduct this research is presented in the appendix. Received: DecemAccepted: MaPublished: April 15, 2015Ĭopyright: © 2015 Albatsh et al. Coles, Glasgow University, UNITED KINGDOM PLoS ONE 10(4):Īcademic Editor: Jonathan A. In all cases, the UPFC locations given by the proposed approach result in better voltage stability than those obtained with the other approaches.Ĭitation: Albatsh FM, Ahmad S, Mekhilef S, Mokhlis H, Hassan MA (2015) Optimal Placement of Unified Power Flow Controllers to Improve Dynamic Voltage Stability Using Power System Variable Based Voltage Stability Indices. A comparison of the steady-state VSIs resulting from the UPFCs placed in the locations obtained with the new approach and with particle swarm optimization (PSO) and differential evolution (DE), which are static methods, is presented. When the UPFCs are placed in the locations obtained with the new approach, the voltage stability improves. The simulation results demonstrate the effectiveness of the proposed method.
#Power flow through a transmission line software#
Simulations were conducted in a power system computer-aided design (PSCAD) software using the IEEE 14-bus and 39- bus benchmark power system models. In this study, the locations of the UPFCs are identified by dynamically varying the loads across all of the load buses to represent actual power system conditions. Power system voltage stability indices (VSIs) including the line stability index ( LQP), the voltage collapse proximity indicator ( VCPI), and the line stability index ( L mn) are employed to identify the most suitable locations in the system for UPFCs. This study examines a new approach to selecting the locations of unified power flow controllers (UPFCs) in power system networks based on a dynamic analysis of voltage stability.
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