Wavelet entropy based single pole grounding fault detection approach for MMC-HVDC overhead lines

被引：0
|
作者：
Wang S. [1 ]
Bi T. [1 ]
Jia K. [1 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources(North China Electric Power University), Changping District, Beijing
来源：
| 1600年 / Power System Technology Press卷 / 40期
关键词：
Fault detection; Lightning interference; MMC; Overhead line; Wavelet time entropy;
D O I：
10.13335/j.1000-3673.pst.2016.07.037
中图分类号：
学科分类号：
摘要：
DC line protection is a key technical problem to solve in overhead line transmission technology with modular multilevel converter HVDC (MMC-HVDC). In this paper, fault current characteristics for MMC-HVDC single pole grounding fault were analyzed by reviewing MMC-HVDC converter structure and travelling wave propagation process. It pointed out that fault characteristics were mainly reflected in change of transient component. Then a novel fault detection approach using wavelet time entropy was proposed, because wavelet time entropy had time-frequency localization traits and ability to characterize transient signal status. Time entropy distribution in different frequency bands of lightning, noise and fault signals was analyzed and compared. Fault detection criterion for differentiating fault from lightning and noise signals was suggested. Computer simulations were carried out. The results show that the proposed approach can detect pole to ground fault and eliminate interference signals such as AC side fault, lightning and noise signals. © 2016, Power System Technology Press. All right reserved.
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页码：2179 / 2185
页数：6
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