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Fast contingency filtering based on linear voltage drop estimates
Otomega, Bogdan; Van Cutsem, Thierry
2005In Proc. IEEE PowerTech Conference
Peer reviewed
 

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Keywords :
Voltage stability; voltage security assessment; contingency filtering; sensitivity analysis; electrical decoupling; CRIC method
Abstract :
[en] This paper deals with the filtering of harmless contingencies in voltage stability and security analyses. In many systems, a post-contingency load flow allows to identify the contingencies with severe impact on voltage stability, as causing either divergence or large voltage drops. However, for filtering purposes, accurate voltage drops need not be computed; linear estimates obtained from sensitivity formulas are appropriate. For a given contingency, the method used in this paper solves a sparse linear system to update the phase angles, assuming constant voltage magnitudes. Then, assuming constant active power flows in the branches, a second sparse system is solved to update the voltage magnitudes. This yields better accuracy than one full load flow iteration while retaining the sparse structure of a decoupled formulation. For contingency analysis, the incidents are filtered by comparing the voltage drops to a threshold. For secure power margin computations, the same procedure is used after stressing the system in the specified direction. The method has been tested on a real system where it has been found to combine simplicity of implementation, quality of filtering and computational efficiency.
Disciplines :
Electrical & electronics engineering
Author, co-author :
Otomega, Bogdan
Van Cutsem, Thierry  ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Systèmes et modélisation
Language :
English
Title :
Fast contingency filtering based on linear voltage drop estimates
Publication date :
June 2005
Event name :
2005 IEEE PowerTech Conference
Event organizer :
Energy Systems Institute & St. Petersburg Polytechnical University
Event place :
St. Petersburg, Russia
Event date :
du 27 juin 2005 au 30 juin 2005
Audience :
International
Main work title :
Proc. IEEE PowerTech Conference
ISBN/EAN :
5-93208-034-0
Pages :
paper 324
Peer reviewed :
Peer reviewed
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Commentary :
(c)2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
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