Results 1 to 10 of about 130,007 (263)
Enhanced transmission line pilot impedance and pilot protection
IET Generation, Transmission and Distribution, 2011 This study proposes a novel pilot protection for transmission lines by using enhanced transmission line pilot impedance (ETLPI). The ETLPI is defined by the ratio of the voltage difference of fault-superimposed component to the current summation of fault-superimposed component at both terminals of the protected line and used to distinguish the internal
J. Xia +5 more
exaly +2 more sources
A novel pilot protection method for UHVDC transmission lines based on U-I characteristics
Energy Reports, 2023 As one of the principal protections of UHVDC transmission lines, pilot protection requires strict synchronization and small data flow by exchanging the current on both terminals under the limitation of DC protection action rapidity. To solve this problem,
Hong Tan +4 more
doaj +3 more sources
Novel setting-less pilot protection for MMC HVDC grids
International Journal of Electrical Power & Energy SystemsThe determination of a suitable threshold is challenging for most of existing pilot protections of MMC HVDC systems. There are two kinds of setting-less pilot protection among the existing research: current polarity-based and inductor voltage-based pilot
Chenhao Zhang +3 more
doaj +3 more sources
Frequency Domain Impedance Based Protection for Flexible DC Distribution Grid
IEEE Access, 2022 The flexible DC distribution grid is suitable for distributed energy resource integration and DC load power supply. However, the fast-increasing fault current has a great impact on the system when a short circuit fault occurs.
Xiuyan Wei +3 more
doaj +1 more source
Journal of Modern Power Systems and Clean Energy, 2023 In the voltage source converter based high-voltage direct current (VSC-HVDC) grids, fast and reliable protections are the key technologies. The traditional protection schemes are easily affected by fault resistance, line distributed capacitance, etc ...
Keao Chen +5 more
doaj +1 more source
IET Generation, Transmission & Distribution, 2023 The unnecessary prolonged operating time of conventional current differential protection under high‐impedance DC line faults is an important issue affecting the continuity of power supply.
Ali Khaleghi‐Abbasabadi +3 more
doaj +1 more source
A Pilot Protection Scheme of DC Lines for MMC-HVDC Grid Using Random Matrix
Journal of Modern Power Systems and Clean Energy, 2023 The over-current capacity of half-bridge modular multi-level converter (MMC) is quite weak, which requests protections to detect faults accurately and reliably in several milliseconds after DC faults.
Senlin Yu, Xiaoru Wang, Chao Pang
doaj +1 more source
New pilot protection method based on the current fault component waveform similarity
IET Generation, Transmission & Distribution, 2023 In order to improve the ability of the modular multi‐level converter to quickly clear and isolate faults in the multi‐terminal flexible DC grid, this paper analyzes the characteristics of current faults in the multi‐terminal flexible direct current grid,
Shuping Gao +3 more
doaj +1 more source
Pilot protection of flexible DC line based on Jaccard similarity integration criterion
电力工程技术, 2023 The flexible DC line protection based on the double-ended method with large communication and long action time is greatly affected by factors such as noise, which makes it difficult to set.
LI Zhenxing +5 more
doaj +1 more source
Dynamic Time Warping Based Pilot Protection Algorithm for AC and HVDC Transmission Lines
IEEE Access, 2023 This paper presents a pilot protection algorithm for alternating (ac) and direct current (dc) transmission lines, the last in the line commutated converter and voltage source converter topologies.
Giovanni Manassero +1 more
doaj +1 more source