| Autor: |
SHU Hong-chun, ZHANG Xue-fei, WANG Xuan, TIAN Xin-cui, YANG Jing-ji, LIU Jun-jie |
| Předmět: |
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| Zdroj: |
Electric Machines & Control / Dianji Yu Kongzhi Xuebao; Jan2021, Vol. 25 Issue 1, p46-58, 13p |
| Abstrakt: |
In order to address the problem that when one pole line suffers from a fault， the other pole line will be coupled to a large voltage mutation rate and current variation rate， and may even cause the protection action of the sound pole line， a UHVDC line fault pole selection element using the attenuation acyclic component was proposed． The analysis of the UHVDC transmission line fault transient characteristics of the time and frequency domain found that the DC line rectifier side of the protection measurement at the attenuation acyclic component of the fault electrode is greater than the attenuation acyclic component of the non-fault electrode， which constitutes the UHVDC fault electrode selection criterion． In the wavelet transform the two-pole line fault current was decomposed， and was reconstructed in the frequency band 0 ～ 20 Hz to extract the attenuation acyclic component of the fault current， and the fault poles were selected according to the ratio of the attenuation acyclic component energy of the two-pole line． A large number of simulation results show that the method has strong robustness for different fault locations， transition resistances， and fault types， and can reliably and quickly select the fault poles under various operating conditions， without the influence of data synchronization， and the threshold value is easy to tune， which has engineering field significance． [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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