Results 131 to 140 of about 122,975 (192)
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, 2021
Aiming at the problems currently existing in transmission line protection for modular multilevel converter (MMC) based high voltage direct current (HVDC) grids, this paper proposes an improved single-ended fault detection scheme for MMC-HVDC transmission
Yunqi Zhang, W. Cong
semanticscholar +1 more source
Aiming at the problems currently existing in transmission line protection for modular multilevel converter (MMC) based high voltage direct current (HVDC) grids, this paper proposes an improved single-ended fault detection scheme for MMC-HVDC transmission
Yunqi Zhang, W. Cong
semanticscholar +1 more source
Telephone interference criteria for HVDC transmission lines
IEEE Transactions on Power Delivery, 1989The telephone interference caused by a transmission line is primarily characterized by the equivalent line disturbance current defined as: le=?n (Cn · In)2 where Cn = C-message weighting factor for the n:th harmonic ln = residual line current of n:th harmonic For many HVdc lines, particularly in North America, this current has been required to be < 270
Arne V. Johansson, Ake Ekstrom
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A Pilot Protection for HVDC Transmission Lines Based on Transient Energy Ratio of DC Filter Link
IEEE Transactions on Power Delivery, 2020To overcome shortages in the traditional current differential protection for HVDC transmission lines, a pilot protection based on transient energy ratio is proposed.
Zhihui Dai +4 more
semanticscholar +1 more source
Transient Simulations for HVDC Transmission Lines
International Review on Modelling and Simulations (IREMOS), 2015A comprehensive methodology for transient studies of HVDC lines for interconnected AC power systems is proposed as a useful tool for its design and operation. This methodology is based on frequency dependent modelling of HVDC transmission lines and a full modelling of their associated equipment in order to do transient simulations.
Mario A. Rios, Sebastian Olivares
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Lightning model for HVDC transmission lines
10th IET International Conference on Developments in Power System Protection (DPSP 2010). Managing the Change, 2010In the paper, the complete lightning model for HVDC transmission lines is presented, and the model is divided into five parts: lightning discharging model, insulator string flashover model, arrester model, tower model and conductor/ground wires model. The proposed lightning model was successfully tested in the PSCAD/EMTDC software.
M. You +4 more
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, 2021
— The voltage source converter based high voltage direct current (VSC-HVDC) technology is a feasible solution to realize wide-area complementarity and flexible consumption of the renewable clean energy resources but DC line faults are crucial problems ...
Yuhan Zhang +4 more
semanticscholar +1 more source
— The voltage source converter based high voltage direct current (VSC-HVDC) technology is a feasible solution to realize wide-area complementarity and flexible consumption of the renewable clean energy resources but DC line faults are crucial problems ...
Yuhan Zhang +4 more
semanticscholar +1 more source
Measurement and Statistical Analysis of Ozone from HVDC and HVAC Transmission Lines
IEEE Power Engineering Review, 1985Corona-generated ozone is one of the parameters considered in evaluating the environmental impact of high voltage ac and dc transmission lines. Measurements of ozone levels near an operating 735-kV ac line and near a test line with ±900-kV and ±450-kV dc line configurations are reported in this paper.
L. Varfalvy +3 more
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Neutral Line Protection System for HVDC Transmission
IEEE Transactions on Power Delivery, 1986This paper described the principle of fault detection and its simulator study, principal circuitry, field test results and field performance records on the neutral line protection system for an HVDC transmission system. In the protection system, 125 Hz ac current injected to the neutral line is utilized as a pilot current to detect the neutral line ...
Y. Kato +5 more
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An Application of HVDC to the de-icing of Transmission Lines
2005/2006 IEEE/PES Transmission and Distribution Conference and Exhibition, 2006Ice accumulation on transmission lines in extreme climatic events can result in severe damage to the lines and towers, with the possibility of being unable to restore the service quickly enough to preserve electricity supplies to customers. To prevent such a situation, Hydro-Quebec TransEnergie are investing in a dedicated "De-icer" installation at its
C. Horwill +3 more
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Fault detection and localization for HVDC transmission lines
2018 Simposio Brasileiro de Sistemas Eletricos (SBSE), 2018This paper evaluates a new method for faults detections in transmission lines in HVDC systems. The proposed method uses voltage and current synchronized data. The HVDC systems are simulated using MATLAB® software. The method for detection of faults in transmission line uses a self-adaptive threshold and presents a redundancy, which allows the detection
Y. Melo, W. Neves, D. Fernandes
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