Abstract
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. Power system voltage stability indices (VSIs) including the line stability index (LQP), the voltage collapse proximity indicator (VCPI), and the line stability index (Lmn) are employed to identify the most suitable locations in the system for UPFCs. 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. Simulations were conducted in a power system computer-aided design (PSCAD) software using the IEEE 14-bus and 39- bus benchmark power system models. The simulation results demonstrate the effectiveness of the proposed method. When the UPFCs are placed in the locations obtained with the new approach, the voltage stability improves. 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. In all cases, the UPFC locations given by the proposed approach result in better voltage stability than those obtained with the other approaches.
Highlights
The demand for electricity has significantly increased in recent years
This study investigated an approach for choosing the locations of unified power flow controllers (UPFCs) in power system networks based on a dynamic voltage stability analysis
Three voltage stability indices (VSIs) (LQP, voltage collapse proximity indicator (VCPI), and Lmn) were implemented in a power system computer-aided design (PSCAD) environment to determine the weakest lines in two example networks, the IEEE 14-bus and 39-bus benchmark networks
Summary
The demand for electricity has significantly increased in recent years. To meet the increasing demand, new power system networks must be constructed or existing networks must be expanded. Developing new systems is expensive and requires a considerable amount of time. Power utilities are compelled to maximize the use of their available resources [1]. 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, PLOS ONE | DOI:10.1371/journal.pone.0123802. 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, PLOS ONE | DOI:10.1371/journal.pone.0123802 April 15, 2015
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