CHEN Yiping,CAO Yulei,ZHAO Ligang,et al.Calculation Method for Unstable Eigenvalue of Power System Based on Exponential Transformation[J].Automation of Electric Power Systems,2023,47(3):161-168.
CHEN Yiping,CAO Yulei,ZHAO Ligang,et al.Calculation Method for Unstable Eigenvalue of Power System Based on Exponential Transformation[J].Automation of Electric Power Systems,2023,47(3):161-168. DOI: 10.7500/AEPS20220119002.
Calculation Method for Unstable Eigenvalue of Power System Based on Exponential Transformation
The premise of judging the small-signal stability of the power system is to calculate all unstable eigenvalues without omission. This paper proposes a dual-layer Arnoldi method based on exponential transform for calculating all unstable eigenvalues of the power system. First
the exponential transformation is introduced to map the unstable eigenvalues of the system to the dominant eigenvalues. Secondly
the outer-layer implicitly restarted Arnoldi algorithm is used to solve all dominant eigenvalues on the transformed spectrum. And all unstable eigenvalues can be calculated after the the inverse transformation. Then
combined with an accelerated convergence technology
the inner-layer Arnoldi algorithm is applied to solve the multiplication of the exponential matrix and vector. Finally
numerical results of two real power systems
i.e. Xing6u and NF2016
indicate that the proposed method can calculate all the unstable eigenvalues of the power system quickly and accurately.
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