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Power Network Fault Location with Exact distributed parameter line model and Sparse Estimation

ELECTRIC POWER SYSTEMS RESEARCH 2022年第0期212卷

作者： Jia, Yixiong Liu, Yu Wang, Binglin Lu, Dayou Lin, Yuzhang ShanghaiTech Univ Sch Informat Sci & Technol Shanghai Peoples R China Univ Massachusetts Dept Elect & Comp Engn Lowell MA 01852 USA

In this paper, an improved fault location method with exact distributed parameter line model and sparse esti-mation is proposed for power networks. Compared to existing sparse estimation based fault location methods that typically use linear impedance line models, the proposed method fully models the distributed parameter characteristics of the line, resulting in a nonlinear formulation of the problem. The paper proves that the idea of sparse equivalent bus current injection still holds even for the proposed nonlinear formulation of the problem and derives the expression of faulted line section and fault location. The proposed method works for faults within two-or three-terminal lines of a power network, and only requires limited PMU placement. Extensive numerical experiments with different fault types, impedances, and locations prove that the proposed method demonstrates higher fault location accuracy than the existing sparse estimation based fault location method.

关键词： Fault location Power networks Sparse estimation distributed parameter line model

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A Fault Location Algorithm for Two-End Series-Compensated Double-Circuit Transmission lines Using the distributed parameter line model

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ELECTRIC POWER COMPONENTS AND SYSTEMS 2017年第6期45卷 615-623页

作者： Kang, Ning Gombos, Gergely Mousavi, Mirrasoul J. Feng, Xiaoming ABB US Corp Res Ctr Raleigh NC USA Kautela Co Ltd Budapest Hungary

A new fault location algorithm for two-end series-compensated double-circuit transmission lines utilizing unsynchronized two-terminal current phasors and local voltage phasors is presented in this paper. The distributed parameter line model is adopted to take into account the shunt capacitance of the lines. The mutual coupling between the parallel lines in the zero-sequence network is also considered. The boundary conditions under different fault types are used to derive the fault location formulation. The developed algorithm directly uses the local voltage phasors on the line side of series compensation (SC) and metal oxide varistor (MOV). However, when potential transformers are not installed on the line side of SC and MOVs for the local terminal, these measurements can be calculated from the local terminal bus voltage and currents by estimating the voltages across the SC and MOVs. MATLAB SimPowerSystems is used to generate cases under diverse fault conditions to evaluating accuracy. The simulation results show that the proposed algorithm is qualified for practical implementation.

关键词： current phasors distributed parameter line model double-circuit transmission line fault location series compensated voltage phasors

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A linear Estimator For Transmission line parameters Based On distributed parameter line model

A Linear Estimator For Transmission Line Parameters Based On...

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IEEE Power and Energy Conference at Illinois (PECI)

作者： Jiao, Xiangqing Liao, Yuan Univ Kentucky Dept Elect & Comp Engn Lexington KY 40506 USA

ISBN: (纸本)9781509055500

Transmission line parameters are critical inputs to a variety of power system analysis algorithms. To ensure the precision of line parameters, this paper proposes a novel linear method to estimate transmission line parameters, including series resistance, series reactance, and shunt susceptance, for non-compensated and series-compensated lines. Voltage and current phasors obtained by phasor measurement units (PMUs) from both ends are utilized in the algorithm. linear least squares method is applied when multiple sets of measurements are available for improved accuracy. distributed parameter line model is employed in developing the algorithm. An optimal estimator is also proposed, which can detect and identify possible measurement errors, although this type of method is no longer linear. The estimated line parameters can be used to determine line temperature and conductor sag. Evaluations studies demonstrate the effectiveness of the proposed methods.

关键词： bad measurement detection and identification distributed parameter line model linear estimation transmission line parameter estimation

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Traveling Wave Differential Protection Technology and Its Application in Ultra-Long-Distance UHVDC Transmission line

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IEEE TRANSACTIONS ON POWER DELIVERY 2025年第2期40卷 1078-1088页

作者： Dong, Xinzhou Wang, Haozong Chen, Binshu Jin, Boliang Li, Xinyuan Dong, Qihuan Shi, Shenxing Wang, Bin Lv, Pengfei Qian, Guoming Chen, Fufeng Fan, Zhanfeng Li, Baowei Xie, Min Feng, Xiaoping Tsinghua Univ Dept Elect Engn State Key Lab Control & Simulat Power Syst & Gener Beijing 100190 Peoples R China State Grid Corp China Beijing 100190 Peoples R China Guodian Nanjing Automat Co Ltd Nanjing 210031 Peoples R China XJ Elect Co Ltd Xuchang 450049 Peoples R China State Grid Anhui Elect Power Corp Hefei 230000 Peoples R China State Grid Xinjiang Elect Power Corp Urumqi 830000 Peoples R China

Traveling wave differential protection (TWDP) is based on the traveling wave (TW) propagation characteristics of the physical transmission line and therefore holds unique advantages in the protection of long-distance transmission lines. This paper proposes a practical time-domain TWDP scheme specifically designed for high-voltage direct-current (HVDC) lines and provides both theoretical analysis and field validation. A TWDP device, named TP-03, was developed and underwent laboratory testing. The developed protection device 1) can stay valid under a maximum fault impedance of up to 1000 Omega under the rated +/- 1100 kV voltage level;2) has an operation time of less than 30 ms even with a communication delay of 20 ms. In October 2020, TP-03 devices were first deployed on the Changji-Guquan UHVDC transmission project, which is the highest voltage (+/- 1100 kV), longest distance (3284 km), and largest capacity (rated 12100 MW) transmission project in the world. During its operation, the devices functioned correctly in several internal faults and external disturbance events. This work represents the first field validation of HVDC TWDP and bridges the gap between theoretical research and real-world applications. It confirms that TWDP can serve as the main protection for ultra-long-distance HVDC lines, setting a benchmark for future projects.

关键词： distributed parameter line model traveling wave traveling wave differential protection protection device prototype ultra-high voltage direct-current distributed parameter line model traveling wave traveling wave differential protection protection device prototype ultra-high voltage direct-current

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Single-ended Time Domain Fault Location Based on Transient Signal Measurements of Transmission lines

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Protection and Control of Modern Power Systems 2024年第2期9卷 61-74页

作者： Jian Luo Yao Liu Qiushi Cui Jiayong Zhong Lin Zhang Chongqing University ChongqingChina Taiyuan University of Technology TaiyuanChina School of Electrical Engineering and with the Liyang Smart City Research Institute Chongqing UniversityChongqing 400044China Electrical Engineering from chongqing University ChongqingChina State Grid Chongqing Electric Power Company Research Institute ChongqingChina

Precise fault location plays an important role in the reliability of modern power *** the in-creasing penetration of renewable energy sources,the power system experiences a decrease in system inertia and alterations in steady-state characteristics following a fault *** existing single-ended phasor domain methods assume a certain impedance of the remote-end system or consistent current phases at both *** problems present challenges to the applicability of con-ventional phasor-domain location *** paper presents a novel single-ended time domain fault location method for single-phase-to-ground faults,one which fully considers the distributed parameters of the line *** fitting of transient signals in the time domain is real-ized to extract the instantaneous amplitude and ***,to eliminate the error caused by assumptions of lumped series resistance in the Bergeron model,an im-proved numerical derivation is presented for the distrib-uted parameter line *** instantaneous symmet-rical components are extracted for decoupling and inverse transformation of three-phase recording *** on the above,the equation of instantaneous phase constraint is established to effectively identify the fault *** proposed location method reduces the negative effects of fault resistance and the uncertainty of remote end pa-rameters when relying on one-terminal data for ***,the proposed fault analysis methods have the ability to adapt to transient processes in power *** comparisons with existing methods in three different systems,the fault position is correctly identified within an error of 1%.Also,the results are not affected by sampling rates,data windows,fault inception angles,and load conditions. Index Terms—Fault location,distributed parameter line model,transient signal,renewable energy,instantaneous phase.

关键词： Fault location distributed parameter line model transient signal renewable energy instantaneous phase

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Traveling Wave Based Differential Protection for Renewable Energy Penetrated Power System

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JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY 2022年第3期17卷 1623-1630页

作者： Wang, Haozong Dong, Xinzhou Tsinghua Univ Dept Elect Engn Beijing 100084 Peoples R China

Renewable sources such as solar and wind is the ideal solution for sustainable development. However, protection methods for renewable energy penetrated power systems still faces a lot of challenges. We claim that the performance of the differential protection is highly related to the model accuracy. Using a detailed distributed parameter line model, this paper developed a novel differential protection method for renewable energy penetrated power systems based on traveling waves with high rapidity and reliability. The optimal differential point is also discussed to enhance protection rapidity. Experiments demonstrate that the proposed protection could soon detect internal faults with high fault resistance while maintaining reliability when external faults occur.

关键词： Renewable energy Current differential protection distributed parameter line model Traveling wave

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Fast and reliable differential protection based on traveling waves for HVDC transmission line

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ENERGY REPORTS 2021年 7卷 619-628页

作者： Wang, Haozong Qi, Zhenkang Fu, Luchuan Liu, Feng Hu, Jianli Dong, Xinzhou Li, Wenzhong Tsinghua Univ Beijing 100084 Peoples R China Shaanxi Elect Power Co Xian 710048 Peoples R China

High voltage direct current (HVDC) technology is the ideal solution for long distance bulk power transmission. However, different from AC systems, differential protection of HVDC lines still faces a lot of challenges. We claim that from the perspective of state estimation, the essence of differential protection is to estimate state variables using measured data, of which the validity indicates whether there is a fault. Therefore, the performance of the differential protection is highly related to the model accuracy. Using a detailed distributed parameter line model, this paper developed a novel differential protection method for HVDC lines based on traveling waves with high reliability. The optimal differential point is also discussed to enhance protection rapidity. Experiments demonstrate that the proposed protection could soon detect internal faults with high fault resistance while maintaining reliability when external faults occur. (C) 2021 The Authors. Published by Elsevier Ltd.

关键词： HVDC Current differential protection distributed parameter line model Traveling wave

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A New Fault-Location Algorithm for Series-Compensated Double-Circuit Transmission lines Based on the distributed parameter model

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IEEE TRANSACTIONS ON POWER DELIVERY 2017年第6期32卷 2398-2407页

作者： Zhang, Ying Liang, Jun Yun, Zhihao Dong, Xiaoming Shandong Univ Sch Elect Engn Jinan 250100 Shandong Peoples R China

A new two-terminal fault-location algorithm for series-compensated double-circuit transmission lines based on the distributed parameter line model is proposed. The system is considered as fully transposed, and a six-sequence component network is introduced to decouple the mutual electromagnetic effects between circuits. Two subroutines designated for the fault that occurs on the left or right side of the series compensator are developed. In each subroutine, the voltage of the series-compensated device is eliminated based on the fact that the sequence voltages calculated from two sides are equal at the fault point. The fault-location function is constructed by utilizing the feature in which the transition resistance is purely resistant at the fault point. The proposed algorithm does not rely on the equivalent model of a series-compensated device. Moreover, it does not require the fault type to be known, and there are no fault-location identification and pseudoroot elimination problems. PSCAD is employed to generate numerous fault cases in diverse conditions and the high accuracy of the proposed fault-location algorithm is validated in MATLAB.

关键词： Double-circuit transmission lines series compensation two terminals six-sequence component distributed parameter line model

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A travelling wave differential protection scheme for half-wavelength transmission line

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INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS 2018年第Jul.期99卷 376-384页

作者： Tang, Lanxi Dong, Xinzhou Tsinghua Univ Dept Elect Engn State Key Lab Power Syst Beijing Peoples R China

Half-wavelength transmission technology is getting more and more attention due to its excellent characteristics such as large transmission capacity and long transmission distance. Traditional differential protection is not applicable to half-wavelength transmission line because of the impact caused by large distributed capacitance current. Travelling wave (TW) differential protection is not affected by distributed capacitance current, so it can be applied to long EHV/UHV transmission line. However, when directly applied to half-wavelength transmission line, large unbalanced differential current will appear during external faults, since the resistance of the line and the frequency-dependent feature of the line parameters which are neglected by TW differential protection have such great impact that they cannot be neglected anymore. In order to improve the performance of TW differential protection, this paper proposes a scheme which has taken the resistance into account and uses power frequency component of the differential current to identify fault for the purpose of avoiding the influence of the frequency-dependent feature of the line parameters. Simulation results verify that the proposed scheme is effective in reducing the unbalanced differential current, and as a result, ensures the selectivity of the protection. The scheme also has high sensitivity during internal faults with large fault resistance.

关键词： Half-wavelength transmission line Differential protection Travelling wave distributed parameter line model

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Accurate and comprehensive fault location algorithm for two-terminal transmission lines

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IET GENERATION TRANSMISSION & DISTRIBUTION 2018年第19期12卷 4334-4340页

作者： Poudineh-Ebrahimi, Farhad Ghazizadeh-Ahsaee, Mahdi Univ Zabol Fac Engn Elect Engn Dept Zabol Iran

In this study, a novel accurate fault location algorithm is presented for two-terminal transmission lines. In contrast to conventional methods, the proposed algorithm not only utilises asynchronous samples recorded during the fault but also needs no line parameters and identification of fault type. In the presented fault-locating method, distributed parameter line model in the time domain and asynchronous data of the terminals collected during fault are applied. Fault locating as an optimisation problem has been solved by the heuristic algorithm of teaching-learning-based optimisation, and the decision variables of fault location, synchronisation time and line parameters are estimated simultaneously. The performance of the presented method was tested with different fault incidence angles, a variety of fault types, and under several system and fault conditions using the MATLAB/Simulink. These tests demonstrate the high accuracy of the presented method. Also, the proposed method did not show any dependence on the impedance of the Thevenin sources of the two sides of the line, the fault impedance and the fault incidence angle. Furthermore, it was not affected by the high resistance of the fault and the network structure.

关键词： fault location optimisation power transmission faults comprehensive fault location algorithm two-terminal transmission lines distributed parameter line model heuristic algorithm teaching-learning-based optimisation fault impedance fault incidence angles accurate fault location algorithm time domain asynchronous data synchronisation time Matlab-Simulink Thevenin sources

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