Wavelet-based analysis and detection of fault-induced transients in HVDC systems
A fast and accurate detection of the transients is essential to ensure a reliable protection system capable to act with high-speed. In this research, a theoretical foundation regarding the high-voltage direct current (HVDC) transmission systems, traveling waves, and the wavelet transform is provi...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/25957 |
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| Resumo: | A fast and accurate detection of the transients is essential to ensure a reliable protection
system capable to act with high-speed. In this research, a theoretical foundation regarding the
high-voltage direct current (HVDC) transmission systems, traveling waves, and the wavelet
transform is provided. Then, a qualitative analysis of the traveling waves induced by faults on
direct current (DC) transmission lines of HVDC systems is presented for detecting the wavefront
arrival times using the boundary wavelet coefficients from real-time boundary stationary
wavelet transform (RT-BSWT). This qualitative analysis takes into account the steady-state, and
the detection of the inception times of both first and second wavefronts at the converter stations.
The behavior of the boundary wavelet coefficients in DC transmission lines is examined considering
the effects of the main parameters that influence the detection of the traveling waves,
such as mother wavelets, sampling frequency, DC transmission line terminations, as well as
fault resistance and distance. An algorithm designed to run in real-time and able to minimize
the factors that hamper the performance of traveling wave-based protection (TWP) methods is
presented to detect the traveling wave arrival times. Quantitative results are achieved based on
the accuracy of one- and two-terminal fault location estimation methods, and indicate the proper
operation of the presented algorithm. |
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