Proteção de linhas de transmissão aéreas de sistemas LCC-HVDC monopolares baseada em ondas viajantes utilizando um terminal
In general, the conventional direct current transmission lines systems, LCC (Line Commutated Converter) systems, present great lengths, which increase the fault occurrence rate and, consequently, the demands on the protection methods. A transmission line protection with fast actuation is indispen...
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| Formato: | Dissertação |
| Idioma: | por |
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Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/25960 |
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| Resumo: | In general, the conventional direct current transmission lines systems, LCC (Line
Commutated Converter) systems, present great lengths, which increase the fault occurrence
rate and, consequently, the demands on the protection methods. A transmission
line protection with fast actuation is indispensable, because avoid damage in the system’s
assets, loss of stability and increase the capacity of electrical energy transmission.
Currently, the protection methods with potential to become the quickest existing are the
traveling wave-based methods. In this work, the traveling wave theory and the traveling
wave-based protection principles are investigates and, at the end, it is proposed an
one-terminal traveling wave-based protection scheme for overhead transmission lines of
monopolar LCC-HVDC (High Voltage Direct Current) systems. The proposed method is
based on the arrival time of the first and second traveling waves on just one line terminal.
Therefore, presents the advantage of not needing communication system and data synchronization
between the line ends as required in the two-terminal traveling wave-based
methods. The sampling frequency impact on the proposed method is considered, which,
in general, is not realized by the one-terminal traveling wave-based methods. Expressions
to determine the minimum sampling frequency for that the method works correctly
are presented in order to avoid excessives sampling rates. In addition, classical problems
regarding to the one-terminal traveling wave-base methods, such as faults very close to
the line ends and the existing error in the estimated propagation velocity of the traveling
waves on the transmission lines, are analyzed and solutions to such problems are presented.
The proposed method evaluation is realized by means of computational simulations.
The results demonstrate the fast action of the proposed scheme, the existence of protection
zones on the protected line and that the proposed scheme not need of the knowledge of
the traveling wave propagation velocity, which makes the method immune to the inaccuracies
in the traveling wave velocity estimation and independent of the transmission line
electrical parameters. |
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