Abstract
| Original language | English |
|---|---|
| Journal | I E E E Transactions on Power Systems |
| Volume | 34 |
| Issue number | 4 |
| Pages (from-to) | 2675-2684 |
| Number of pages | 9 |
| ISSN | 0885-8950 |
| DOIs | |
| Publication status | Published - 2019 |
Keywords
- Algorithms
- Power system analysis computing
- Real-time assessment
- Thevenin equivalent
Cite this
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A Memory-Efficient Parallelizable Method for Computation of Thévenin Equivalents used in Real-Time Stability Assessment. / Jørgensen, Christina Hildebrandt Lüthje; Møller, Jakob Glarbo; Sommer, Stefan; Jóhannsson, Hjörtur.
In: I E E E Transactions on Power Systems, Vol. 34, No. 4, 2019, p. 2675-2684.Research output: Contribution to journal › Journal article › Research › peer-review
TY - JOUR
T1 - A Memory-Efficient Parallelizable Method for Computation of Thévenin Equivalents used in Real-Time Stability Assessment
AU - Jørgensen, Christina Hildebrandt Lüthje
AU - Møller, Jakob Glarbo
AU - Sommer, Stefan
AU - Jóhannsson, Hjörtur
PY - 2019
Y1 - 2019
N2 - This paper introduces a factor-solve method, which efficiently computes Thevenin equivalents for all buses in the power system. A range of real-time stability assessment methods rely on Thevenin equivalents, and it is therefore essential that these can be determined fast and efficiently. The factor-solve method has runtime for computing Thevenin voltage that scales linearly with system size resulting in runtime of only a few milliseconds even for systems with several thousand buses. The computations only need the sparse admittance matrix for the power system and a sparse factorization resulting in low memory requirements, and furthermore Thevenin impedances can be determined in parallel. The factor-solve method is compared to a reference method, which uses coefficients for super-position to determine the Thevenin equivalents. The reference method is shown to have dissatisfying runtime and complexity. The factorsolve method is tested, parallelized and analysed, which shows a considerable speed-up in computations of Thevenin equivalents enabling them to be computed in real-time.
AB - This paper introduces a factor-solve method, which efficiently computes Thevenin equivalents for all buses in the power system. A range of real-time stability assessment methods rely on Thevenin equivalents, and it is therefore essential that these can be determined fast and efficiently. The factor-solve method has runtime for computing Thevenin voltage that scales linearly with system size resulting in runtime of only a few milliseconds even for systems with several thousand buses. The computations only need the sparse admittance matrix for the power system and a sparse factorization resulting in low memory requirements, and furthermore Thevenin impedances can be determined in parallel. The factor-solve method is compared to a reference method, which uses coefficients for super-position to determine the Thevenin equivalents. The reference method is shown to have dissatisfying runtime and complexity. The factorsolve method is tested, parallelized and analysed, which shows a considerable speed-up in computations of Thevenin equivalents enabling them to be computed in real-time.
KW - Algorithms
KW - Power system analysis computing
KW - Real-time assessment
KW - Thevenin equivalent
U2 - 10.1109/TPWRS.2019.2900560
DO - 10.1109/TPWRS.2019.2900560
M3 - Journal article
VL - 34
SP - 2675
EP - 2684
JO - I E E E Transactions on Power Systems
JF - I E E E Transactions on Power Systems
SN - 0885-8950
IS - 4
ER -