Hongchun Shu

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Traveling wave produced by a short-circuit fault or lightning will propagate along transmission lines with deformation and attenuation, which are due to energy loss and frequency-dependent line parameters. By the phase-modal transform method, the multi-conductor transmission lines could be decoupled into independent modal. Each modal is a single uniform(More)
One of the serious problems in large-capacity and long-distance power energy transmission is low frequency oscillations (LFO) in the interconnected areas of power systems. Oscillation power and the synchronous angel speed of the two areas can be calculated benefiting from voltage amplitudes and angels of the two areas monitored by phasor unit measurement(More)
This pape presents artificial neutral network algorithm for fault type classification and fault distance location for all the types of faults for transmission line in triangle network. This technology uses only one end data and accurate fault distance location fault type identifying is achieved after half cycle from the inception of fault. The proposed(More)
The paper presents a procedure for fault feeder detection in distribution power systems, based on the use of the amplitude-time and argument-time by S-transform of the zero-module bus voltage and two phase currents transients associated with the fault-originated traveling waves. The analysis carried out shows that the argument of currents have difference(More)
An approach to detect fault line in distribution network using neural network based on S-transform energy is proposed und after analyzing the variance of fault characteristic frequency of zero sequence current in each feeder line of overhead line and underground cable mixed lines. In order to avoid the effect of TA's disconnection angle, the short window(More)
There is a smoothing reactor and DC filter between the inverter and the direct current line to form a boundary in the HVDC transmission system. Since this boundary presents the stop-band characteristic to the high frequency transient voltage signals, the high-frequency transient voltage signal caused by external faults through boundary will be attenuated(More)
Due to the impact of heavy ice loading conditions and high altitude geographical environment, discharge between lightning shielding wires and conductors frequently happens as a result of uneven ice shedding in part of 220kV Fugong-Lanping transmission line across Biluo snow-capped mountain in Yunnan province. This condition is often accompanied by tripping(More)
The physical boundary of a high voltage direct current (HVDC) transmission line consists of smoothing reactor and DC filter. It has the stop-band characteristic to the high-frequency transient voltage components. The high-frequency voltage signal from the external of DC transmission lines will be weakened when it travels through the smoothing reactor and DC(More)
Fuzzy clustering algorithm is proposed for a high voltage switchgear state evaluation, In order to make the evaluation results have comparability, the algorithm uses invariant center for clustering method, and it can directly cluster samples without prior information. The data of live detection using sudden-change component in order to reduce the(More)
There is a smoothing reactor and DC filter between the inverter and the direct current line to form a boundary in the HVDC transmission system. Since this boundary presents the stop-band characteristic to the high frequency transient voltage signals, the high-frequency transient voltage signal caused by external faults through boundary will be attenuated(More)