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Abstract
Thevenin equivalents are used by a range of power system stability indicators, such as the Lindex for voltage stability and the aperiodic small signal rotor angle stability indicator. This paper investigates the effect of using different factorization methods for computing coefficients for widearea Thevenin equivalents. Direct and incomplete factorization methods are compared with respect to runtime, accuracy and amount of fillin. The paper introduces a proof that the block triangular form of bus admittance matrices will have no nonzero entries in the offdiagonal. KLU factorization is found to perform almost twice as fast as the standard LU factorization with no cost of accuracy. It is, however, shown that the largest computational workload is associated with dense matrix multiplications. An incomplete method reduces the fillin of coefficient matrices at the cost of accuracy in Thevenin voltages. It is shown, that inaccuracies are amplified as the Lindex approaches the stability limit.
Original language  English 

Title of host publication  Proceedings of 2018 Power Systems Computation Conference 
Number of pages  7 
Publisher  IEEE 
Publication date  2018 
Pages  7 pp. 
ISBN (Print)  9781910963104 
DOIs  
Publication status  Published  2018 
Event  20th Power Systems Computation Conference  O’Brien Centre for Science at University College Dublin, Dublin, Ireland Duration: 11 Jun 2018 → 15 Jun 2018 Conference number: 20 http://www.pscc2018.net/index.html 
Conference
Conference  20th Power Systems Computation Conference 

Number  20 
Location  O’Brien Centre for Science at University College Dublin 
Country/Territory  Ireland 
City  Dublin 
Period  11/06/2018 → 15/06/2018 
Internet address 
Keywords
 Power system analysis computing
 Realtime assessment
 Thevenin equivalent
 Widearea monitoring
 Power system stability indicators
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Dive into the research topics of 'Evaluation of Factorization Methods for Thévenin Equivalent Computations in RealTime Stability Assessment'. Together they form a unique fingerprint.Activities
 1 Participating in or organising a conference

20th Power Systems Computation Conference
Christina Hildebrandt Lüthje Jørgensen (Participant)
11 Jun 2018 → 15 Jun 2018Activity: Attending an event › Participating in or organising a conference