Location of UPFC Based on Critical Bus Ranking Index.
01 Jan 2020-pp 795-805
TL;DR: A novel method is proposed which identifies the best location for UPFC placement based on the net reduction in the critical bus ranking index under various line outage contingencies and it is found that the installation of UPFC has reduced the criticality of the selected bus and it also enhanced the voltage stability margin of the system under selected line outage contingencyencies.
Abstract: Unified power flow controller (UPFC) is one among the versatile devices from the FACTS family that has a great potential to enable power system engineers maintain the required security level of a large power systems that are interconnected by controlling the amount of active and/or reactive power flow. Identification of suitable location for installing this costly device is relatively very difficult task. Various criteria need to be satisfied before selecting the location for installation of UPFC. In this paper, a novel method is proposed which identifies the best location for UPFC placement based on the net reduction in the critical bus ranking index under various line outage contingencies. The proposed method was implemented on a 5-bus system. The UPFC was placed at the identified location and it is found that the installation of UPFC has reduced the criticality of the selected bus and it also enhanced the voltage stability margin of the system under selected line outage contingencies.
Citations
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11 May 2020
TL;DR: The performance of a 161-kV UPFC modelled in SimPowerSystems is tested on Ghana’s power transmission network and results show that the device improved the connecting bus voltage and active power loss.
Abstract: Interconnecting power transmission systems provide reliability of electric power supply. The security of the system is however questioned when a disturbance in any part of the interconnected system causes instability in the entire network. Unified Power Flow Controller (UPFC), which is a member of the flexible alternating current transmission system (FACTS) family, has the capability of controlling active and reactive power flow in a transmission line thereby improving the voltage stability of the system especially at the 500 kV configuration level. The performance of a 161-kV UPFC modelled in SimPowerSystems is tested on Ghana’s power transmission network. The optimal placement of the UPFC is done using fast voltage stability index (FVSI) and maximum loadability assessment (MLA). The results show that the device improved the connecting bus voltage from 0.88 p.u. to 0.98 p.u. Active power loss in the network was also reduced from 13.40 MW to 10.39 MW when the UPFC was in circuit. Keywords : Ghana , Stability, Transmission system and Unified Power Flow Controller (UPFC)
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06 Mar 2014
TL;DR: The optimal location and the ratings of FACTS devices such as Thyristor Controlled Series Capacitor, Static VAR Compensator and Unified Power Flow Controller are determined using Genetic Algorithm (GA).
Abstract: Due huge increase in power demand, power system network will lead to have major problems such as voltage instability and voltage collapse in the power system. To overcome these problems, Flexible AC Transmission System (FACTS) devices have been implemented in power system. By placing these devices in suitable locations, the power system can be operated far away from the instability point. In this paper, the optimal location and the ratings of FACTS devices such as Thyristor Controlled Series Capacitor (TCSC), Static VAR Compensator (SVC) and Unified Power Flow Controller (UPFC) are determined using Genetic Algorithm (GA). A multi objective optimization problem is formulated with the consideration of minimizing voltage stability index, real power loss and generator cost. Evolutionary algorithm such as GA is a population based search method is used for solving multi objective optimization problem that is capable of searching for multiple solutions concurrently in a single run and provide an optimal solution. It is observed from the results that the voltages stability index, real power loss and generator cost are reduced by optimally locating the FACTS devices in the power system. IEEE 14 bus system is used to demonstrate the effectiveness of the proposed algorithm.
10 citations