Journal
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
Volume -, Issue -, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s13369-023-07705-z
Keywords
Power swing; Single-phase fault; Wavelet transform; Wavelet energy; Fault impedance
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Power swings can cause issues, but usually the power system stabilizes after a power swing. This article focuses on detecting single-phase faults during power swings, particularly asymmetric power swings. The suggested approach uses wavelet transform on the zero-sequence current signal to identify the faults. Simulation and analysis results confirm the effectiveness of the proposed method.
Power swings occur related to some contingencies. But in some conditions, the relay sends a trip command incorrectly, while in most cases, the power system reaches a new equilibrium after a power swing. Statistically, the probability of the occurrence of a single-phase fault is higher than other faults, and also the intensity of other faults is higher than single-phase faults, so it is easier to identify them. Therefore, the focus of this article is on single-phase fault detection during a power swing. On the other hand, the analysis of asymmetric power swing is challenging compared to the symmetrical power swing, so in this article, the focus is on single-phase fault detection during asymmetric power swing. The suggested approach utilizes the wavelet transform (WT) on the amplitude of the zero-sequence current signal. Then, by calculating the energy of frequency components extracted from the WT and determining a threshold value, the single-phase fault is identified under asymmetric power swing conditions in the network. According to the obtained results and sensitive analysis, single-phase faults are detected by specifying 20 J as the threshold energy for the changes in the extracted frequency components of zero-sequence current. Simulation and analysis results confirm the capability of the proposed method for a standard case study network.
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