DocumentCode :
3483209
Title :
Fast contingency filtering based on linear voltage drop estimates
Author :
Otomega, Bogdan ; Van Cutsem, Thierry
Author_Institution :
Univ. of Liege, Liege
fYear :
2005
fDate :
27-30 June 2005
Firstpage :
1
Lastpage :
8
Abstract :
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.
Keywords :
electric potential; power system security; power system stability; fast contingency filtering; full load flow iteration; linear voltage drop estimates; post-contingency load flow; secure power margin computations; security analyses; voltage drops; voltage stability; Active filters; Computational efficiency; Filtering; Linear systems; Load flow; Nonlinear filters; Security; Stability analysis; System testing; Threshold voltage; CRIC method; Voltage stability; contingency filtering; electrical decoupling; sensitivity analysis; voltage security assessment;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power Tech, 2005 IEEE Russia
Conference_Location :
St. Petersburg
Print_ISBN :
978-5-93208-034-4
Electronic_ISBN :
978-5-93208-034-4
Type :
conf
DOI :
10.1109/PTC.2005.4524498
Filename :
4524498
Link To Document :
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