考虑线路参数频变特性的小波域行波信号奇异性增强方法

doi:10.19595/j.cnki.1000-6753.tces.161806

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Abstract The frequency characteristic of line parameter was analyzed in the paper, and the change law of attenuation coefficient and velocity with frequency were obtained; when the transmission distance increased, the wave front of traveling-wave would be distorted, and its singularity would decrease, which made it difficult to accurately determine the velocity and arrival time of traveling-wave, the accuracy of fault location would be reduced. Based on the propagation theory of traveling-wave, the paper proposed a singularity enhancement method in wavelet domain with considering the frequency characteristic of line parameter. The propagation coefficients of traveling-wave within a certain band were calculated by carson equation, the correction function was obtained in frequency domain, and it was used to compensate the distorted wave front of traveling-wave in wavelet domain by fast fourier transform. Thus, the dispersion effect of traveling-wave was reduced or eliminated, the singularity of traveling-wave was enhanced and the accuracy of fault location was improved. Simulation experiments illustrate that the proposed method can effectively improve the accuracy of current traveling-wave-based fault location methods.

Key words： Traveling-wave dispersion effect fault location double-ended method

Received: 28 November 2016 Published: 18 August 2017

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TM75

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	Articles by authors
	Jia Huibin
	Su Silan
	Li Mingshu
	Zheng Hongda

Cite this article:

Jia Huibin,Su Silan,Li Mingshu等. A Singularity Enhancement Method in Wavelet Domain for Traveling-Wave with Considering Frequency Characteristic of Line Parameter[J]. Transactions of China Electrotechnical Society, 2017, 32(15): 153-160.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.161806 OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I15/153

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