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The line boundary of high voltage direct current (HVDC) system is composed of dc filters and smoothing reactor, which has attenuation to high frequency signals and can be used to propose novel line protections. Analysis on the high frequency attenuation characteristic of line boundary is presented in this paper. Based on the practical parameters and arrangements of dc filters and smoothing reactor,...
On the basis of analyzing the frequency characteristics of EHV transmission line boundary, this paper presents a novel principle and algorithm of boundary protection unit for extra-high-voltage transmission lines. The protection algorithm utilizes the improved recursive wavelet transform (IRWT) to extract the desirable frequency components of fault-induced transient signals. And then the IRWT measures...
This paper proposes a modified split and merge algorithm for line extraction with high accuracy, efficient speed and low complexity. It is robust against measurement noises and demonstrates satisfactory results on different surfaces in determining line boundaries. The method is based on the least square equation to fit a line on a series of uncertain points. Different least square criterion is investigated...
The characteristics of line boundary are further studied. Then this paper analyzes the feature differences of backward traveling-waves between internal and external faults. The main difference is that the ratio of high frequency to low frequency components in case of external faults is less than that in case of internal faults. In terms of the different features, the paper proposes a novel non-unit...
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