Abstract
Traditional single-threshold state analysis and fault location methods for power system still need to improve in detection accuracy and applicability. In this paper, a dual-threshold state analysis and fault location method based on Tracy–Widom distribution is proposed to improve the accuracy and widen the application fields of some typical methods. Taking the false alarm probability into accountant, the maximum and minimum eigenvalues of sample covariance matrix are adopted to construct the upper and lower thresholds, respectively, and the difference of eigenvalues is settled as the detection indicator to realize the state analysis. For fault location, the positioning index is obtained from the augmented matrixes of each bus and then is compared with the thresholds to determine the fault location. The comparison analysis based on IEEE 39-Bus system verifies that the proposed method outperforms the conventional solutions in terms of accuracy, anti-interference ability and universality in various situations, especially for early faults detection.
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This work was supported by Key Technologies Research and Development Program (2020YFB1711102 and 2020YFB1711100).
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Zhang, J., Wu, D. A dual-threshold state analysis and fault location method for power system based on random matrix theory. Nonlinear Dyn 107, 2469–2483 (2022). https://doi.org/10.1007/s11071-021-07056-0
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DOI: https://doi.org/10.1007/s11071-021-07056-0