Electric Power ›› 2014, Vol. 47 ›› Issue (10): 40-46.DOI: 10.11930/j.issn.1004-9649.2014.10.40.6

• Power System-Column of UHVDC Transmission • Previous Articles     Next Articles

Identification of UHVDC Transmission Line Lightning Disturbance Based on Morphology

CHEN Shi-long, CAO Rui-rui, BI Gui-hong, LI Xing-wang, RONG Jun-xiang   

  1. School of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China
  • Received:2014-04-15 Online:2014-10-18 Published:2015-12-10
  • Supported by:
    This work is supported by National Natural Science Foundation of China (51267008)

Abstract: Study on the transient characteristics of the electric signal is significant to the development of transient-based protection and its reliability improvement when the overhead transmission lines are disturbed by the direct lightning stroke. The multi-scale decomposition of mathematical morphology can decompose the complex signal into different sections with physical significance, and highlight the local features of the waveform. The mathematical morphology is used to make a multi-scale decomposition of the transient currents resulted from the non-fault lightning stroke, fault lightning stroke and line short circuit of the ±800 kV UHVDC transmission lines. The spectrum energies from the high and low frequency bands are extracted respectively. According the ratio of the maximum amplitudes of the waveforms in the second scale to the sixth scale of the first head of the current, the fault lightning stroke and the line short circuit can be distinguished. Extensive simulations demonstrate that the approach is correct and effective.

Key words: UHVDC transmission lines, lightning fault, mathematical morphology, spectrum energy, main criterion

CLC Number: