Auto-reclosing Protection Scheme for Multi-Terminal Mixed Lines Using Synchrophasor Measurements

Naidu, O. D.; Yalla, Preetham; George, Neena

doi:10.1109/sgsma.2019.8784680

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…Impedance-based fault section identification methods are proposed for two-terminal [15] and three-terminal [16] hybrid lines. The accuracy of these methods depends on each section's electrical parameters and these parameters change with the temperature and aging of the conductors, especially for UGC/SC sections.…”

Section: B Literature Reviewmentioning

confidence: 99%

Setting Free Fault Location for Three-Terminal Hybrid Transmission Lines Connected With Conventional and Renewable Resources

Kukkala¹,

Naidu²

2023

IEEE Access

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Three-terminal hybrid transmission lines (TTHTLs) are attractive from both environmental and commercial view. Hybrid transmission lines are growing due to urbanization, connecting an industrial load and renewable integration. A TTHTL comprises sections of both overhead lines and underground/subsea cables or overhead lines with different X/R ratios. Faulted section identification (FSI) is key for defining the adaptive/selective auto-reclosing scheme and estimation of the fault location for TTHTLs. In this paper, FSI and fault location algorithms are proposed without using the parameters of any line section. Novelty of the methodology lies in a two-stage approach to the problem. In the first stage, series impedance parameters of all the sections are calculated using closed loop formulae. These parameters are then utilized in identifying the faulted section. In the second stage, the above calculated line section parameters and faulted section are used to estimate complete line parameters including shunt capacitance and subsequently the fault location. The advantage of the proposed method is that it does not require an initial guess of the line section parameters, is non-iterative in the first stage, and provides correct fault section identification for TTHTLs. These features make it suitable for designing the selective auto-reclosing protection scheme for the TTHTLs within traditional protection relaying hardware. More importantly, the series impedance parameters calculated in the first stage constitute good initialization values for the non-linear problem of estimating the complete line parameters. This results in better convergence of the algorithm and accurate parameter estimation. The developed solution is verified using the PSCAD/EMTDC simulations for TTHTLs connected with conventional and different inverter-based renewable resources. The performance of the proposed solution is compared with commercially available solutions, and it is found to be accurate. This solution is amenable for implementation in line differential protection relays without additional infrastructural changes.INDEX TERMS Adaptive auto-reclosing protection scheme, inverter-based renewable resources, faulted section identification, fault location, parameter estimation, three-terminal hybrid transmission lines NOMENCLATURE A. VARIABLES

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Section: B Literature Reviewmentioning

confidence: 99%

Setting Free Fault Location for Three-Terminal Hybrid Transmission Lines Connected With Conventional and Renewable Resources

Kukkala¹,

Naidu²

2023

IEEE Access

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“…These factors have resulted in the increased installation of three-terminal mixed lines by utilities [1]. Installation of three-terminal mixed lines into the power grid introduces many challenges [2][3][4][5][6] for the auto-reclosing (AR) and fault location (FL) functionalities. AR is a very crucial application to improve the stability of the power system [3].…”

Section: Introductionmentioning

confidence: 99%

“…For mixed lines [1][2][3] the guidelines state that AR shall be used only if the faulted section (FS) is known. The FS identification is difficult for mixed lines [4][5][6] as parameters (resistance, inductance and capacitance per km) of each section of the line are different. Also, the FL and parameters estimation of the three-terminal mixed lines are challenging [7][8][9] as characteristic impedance and propagation constants are not uniform for the entire line.…”

Section: Introductionmentioning

confidence: 99%

Parameter estimation, selective auto‐reclosing and fault location for three‐terminal mixed transmission lines using synchronised data

Naidu¹,

George²,

Yalla³

2020

IET Generation Trans & Dist

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Considering both environmental and commercial aspects, mixed three‐terminal transmission lines are attractive. Mixed three‐terminal lines consist of two sections of the overhead line and one section of underground cable. In this work, a selective auto‐reclosing, fault location, and parameter estimation technique for mixed three‐terminal lines using synchronised data from all three terminals are proposed. The proposed method uses the pre and during‐fault data recorded at the three ends of the line. Using the recorded sampled data, pre‐fault and during‐fault phasors are estimated. Four functions are formulated from the pre‐fault equivalent network of the system. Additionally, three sets of four functions each are formulated after assuming the fault to be on each of the three sections. Subsequently, the faulted section, fault location, and three sets of line parameters are simultaneously calculated by solving each set of equations. Finally, the correct faulted section, location, and parameters are identified based on the characteristics of obtained line parameters and fault location. Furthermore, the identified faulted section information is applied to enable or block the auto‐reclosing function. The simulations and analysis are carried out using PSCAD/EMTDC and MATLAB scripts, respectively. The accuracy, capabilities, applications, and limitations are discussed for different fault scenarios.

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Setting-free Smart Recloser for Three Terminal Mixed Lines

Likhitha,

Naidu

2023

2023 7th International Conference on Computer Applications in Electrical Engineering-Recent Advances (CERA)

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Auto-reclosing Protection Scheme for Multi-Terminal Mixed Lines Using Synchrophasor Measurements

Cited by 6 publications

References 13 publications

Setting Free Fault Location for Three-Terminal Hybrid Transmission Lines Connected With Conventional and Renewable Resources

Setting Free Fault Location for Three-Terminal Hybrid Transmission Lines Connected With Conventional and Renewable Resources

Parameter estimation, selective auto‐reclosing and fault location for three‐terminal mixed transmission lines using synchronised data

Setting-free Smart Recloser for Three Terminal Mixed Lines

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