Introduction - If you have any usage issues, please Google them yourself
Based on the boundary characteristic of a dc transmission
line, the response of transient harmonic current in the
line-commutated converter HVDC transmission system is analyzed
under various fault conditions in this paper. A new transient
harmonic current protection scheme is proposed. The discrete
Fourier transform is used to extract transient harmonic currents
at both terminals of the dc transmission line and the type of fault
can be identified by the transient harmonic currents. Two main
factors including fault resistance and fault location that affect
performance of the protection are also discussed in this study. The
test system is modeled based on the CIGRE benchmark including
distributed parameters of the dc transmission line. Comprehensive
test studies show that the performance of the transient harmonic
current protection scheme is encouraging. It can not only identify
internal faults and external faults correctly and quickly, but also
can respond to high ground resistance faults.