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Abstract
Thevenin equivalents are used by a range of power system stability indicators, such as the L-index 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 wide-area Thevenin equivalents. Direct and incomplete factorization methods are compared with respect to runtime, accuracy and amount of fill-in. The paper introduces a proof that the block triangular form of bus admittance matrices will have no non-zero entries in the off-diagonal. 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 fill-in of coefficient matrices at the cost of accuracy in Thevenin voltages. It is shown, that inaccuracies are amplified as the L-index approaches the stability limit.
Original language | English |
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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 |
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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
- Real-time assessment
- Thevenin equivalent
- Wide-area monitoring
- Power system stability indicators
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Dive into the research topics of 'Evaluation of Factorization Methods for Thévenin Equivalent Computations in Real-Time Stability Assessment'. Together they form a unique fingerprint.Activities
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20th Power Systems Computation Conference
Jørgensen, C. H. L. (Participant)
11 Jun 2018 → 15 Jun 2018Activity: Attending an event › Participating in or organising a conference