Abstract The DC transmission system has strong nonlinearity. The traveling wave protection of DC transmission line using the superposition principle and wavelet transform algorithm has the adaptability problems. The traveling wave protection of DC transmission lines only uses the amplitude information of traveling wave transient. There is a problem with protection refusal at the end of the fault. Aiming at this problem, a single-ended protection method for UHVDC transmission line is proposed. By studying the physical boundary characteristics at both ends of the UHVDC transmission line, the relationship between the Hilbert energy waveform information and the voltage traveling wave is derived, and the physical boundary is smoothed to the Hilbert energy waveform. The physical boundary element and the frequency characteristics of the DC transmission line are analyzed. It is found that the physical boundary element and the DC transmission line have attenuating the transient high-frequency component, and the Hilbert energy is used to characterize the attenuation of the high-frequency component. In the case of faults in the DC transmission line, the transient energy amplitude and waveform shape of the high-frequency transient band 5~7kHz are obviously different. The standard deviation is used to describe the high-band Hilbert instantaneous energy amplitude information and waveform information to construct DC. Transmission line fault identification criteria. The fault selection criterion is constructed by using the ratio of the standard deviation of the positive and negative poles to realize the full-line quick-action protection of the fault pole. The simulation results show that the protection method can reliably distinguish faults in the DC line and outside, realize fault selection, and protect the full length of UHVDC lines.
Fan Yanfang,Wang Yongjin. Single-Ended Protection Method for UHVDC Transmission Line Based on Hilbert Energy Amplitude Information and Waveform Information[J]. Transactions of China Electrotechnical Society, 2021, 36(9): 1818-1830.
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2021, Vol. 36 
