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Book ChapterDOI

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.

AbstractUnified 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.

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Citations
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Journal ArticleDOI
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)

References
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Journal ArticleDOI
Abstract: This paper deals with optimal power flow control in electric power systems by the use of a unified power flow controller (UPFC). Models suitable for incorporation in power flow programs are developed and analysed. The application of UPFC for optimal power flow control is demonstrated through numerical examples. It is shown that a UPFC has the capability of regulating the power flow and minimising the power losses simultaneously. An algorithm is proposed for determining the optimum size of UPFC for power flow applications. The performance of UPFC is compared with that of a phase shifting transformer (PST).

407 citations

Journal ArticleDOI
01 Sep 1997
Abstract: A new and comprehensive load flow model for the unified power flow controller (UPFC) is presented. The UPFC model is incorporated into an existing FACTS Newton-Raphson load flow algorithm. Critical comparisons are made against existing UPFC models, which show the newly developed model to be far more flexible and efficient. It can be set to control active and reactive powers and voltage magnitude simultaneously. Unlike existing UPFC models, it can be set to control one or more of these parameters in any combination or to control none of them. Limits checking and an effective control coordination between controlling devices are incorporated in the enhanced load flow program. The algorithm exhibits quadratic or near-quadratic convergence characteristics, regardless of the size of the network and the number of FACTS devices.

201 citations

Journal ArticleDOI
Abstract: The unified power flow controller (UPFC) is a solid-state controller which can be used to control active and reactive power flows in a power transmission line. In this paper, the authors propose a control strategy for UPFC in which they control real power flow through the line, while regulating magnitudes of the voltages at its two ports. They design a controller for this purpose which uses only local measurements. The control strategy is evaluated using digital simulation for a case study.

156 citations

Journal ArticleDOI
Abstract: This paper presents a new approach based on Differential Evolution (DE) technique to find out the optimal placement and parameter setting of Unified Power Flow Controller (UPFC) for enhancing power system security under single line contingencies. Firstly, we perform a contingency analysis and ranking process to determine the most severe line outage contingencies considering line overloads and bus voltage limit violations as a Performance Index. Secondly, we apply DE technique to find out the optimal location and parameter setting of UPFC under the determined contingency scenarios. To verify our proposed approach, we perform simulations on an IEEE 14-bus and an IEEE 30-bus power systems. The results we have obtained indicate that installing UPFC in the location optimized by DE can significantly enhance the security of power system by eliminating or minimizing the overloaded lines and the bus voltage limit violations.

118 citations

Journal ArticleDOI
F. D. Galiana1
Abstract: The effect of line outages on the real power flows of a system is analyzed using the DC load flow model. It is shown that the effect of the out4ge of line jk on the power flow of an arbitrary line lm can be bounded above and below by a series of progressively tighter values which in the limit correspond to the exact DC load flow solution. The calculation of these bound estimates on the contingency line flows is progressively more computationally demanding as the limits tighten, however, the simple to compute bounds, although more conservative, still serve to filter out a large portion of the non-critical contingencies. The remaining few potentially critical outages can then be ranked and analyzed through the full DC load flow.

112 citations