Analysis of Short-Circuit Current Characteristics and Its Distribution of Artificial Grounding Faults on DC Transmission Lines

The current-limiting reactor is currently the most used fault current limiting technique to ensure the fault ride-through of the multi-terminal dc grid. However, its configuration will significantly prolong the fault current clearance time and increase the dissipated energy of dc circuit breakers. Therefore, this paper proposes a cost-effective multiline fault current limiter for multiport application in multi-terminal dc grids, which can effectively limit the rising speed of fault current through the integrated currentlimiting reactors without time delay and significantly reduce their negative impacts on the performance of dc circuit breakers by bypassing the current-limiting reactors through the solid-state switch units during the fault current interruption process. The topology and operation process of the multiline fault current limiter are introduced at first. Then, the economic comparison of the proposed device with the existing solutions is presented. Finally, the feasibility and superiorities of the proposed device are verified by extensive simulations and scaled-down experiments.

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“…5. The accurate fault current calculation methods can be found in Refs [34–36]. The dc line is modeled as lumped inductance L dc1 ‐ L dc n .…”

Section: Multiline Fault Current Limitermentioning

confidence: 99%

Multiline Fault Current Limiter for DC Line Fault in Multi‐terminal DC Grids

Han

Qin

Zhao

et al. 2023

IEEJ Transactions Elec Engng

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“…In addition, the controllability of the converter currents under external fault condition is of great importance for protection design and for their integration with the converter control algorithm. While a certain number of papers consider the eventuality of a fault on the DC side of VSCs, both in high- [43][44][45] and low-voltage [46][47][48] applications, and provide extensive analysis of fault currents and converter behavior in fault conditions, the concept of fault current control is still not completely developed. Some papers introduce converter topologies and controls designed to be tolerant to DC-side faults on VSCs, both for high- [49][50][51][52][53][54] or low-voltage [7,23] applications, or devices capable of limiting shortcircuit currents [55][56][57][58].…”

Section: Introductionmentioning

confidence: 99%

Fault-Tolerant Multiport Converter for Hybrid Distribution Systems: Configuration, Control Principles and Fault Analysis

Negri,

Ubezio,

Faranda

2024

Applied Sciences

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Multiport converters (MCs) are widely adopted in many applications, from renewable energy sources and storage integration to automotive applications and distribution systems. They are used in order to interface different energy sources, storage devices and loads with one single, simple converter topology in contrast to the traditional approach, which can require different solutions made by two-port converters. MCs allow for a reduction in the number of components and cascaded conversion stages with respect to an equivalent system of two-port converters, resulting in reduced complexity, dimensions and costs, as well as in improved reliability and enhanced efficiency. Nevertheless, some aspects related to the design of MCs are still worth further discussion when MCs are applied to hybrid AC/DC distribution systems. First, most converters are developed for one specific application and are not modular in structure. Furthermore, many of the proposed solutions are not equally suitable for AC and DC applications and they can introduce significant issues in hybrid distribution systems, with earthing management being particularly critical. Even though most available solutions offer satisfying steady-state and dynamic performances, fault behavior is often not considered and the possibility of maintaining controllability during faults is overlooked. Building on these three aspects, in this paper, a new MC for hybrid distribution systems is presented. An innovative circuit topology integrating three-phase AC ports and three-wire DC ports and characterized by a unique connection between the AC neutral wire and the DC midpoint neutral wire is presented. Its control principles and properties during external faults are highlighted, and extensive numerical simulations support the presented discussion.

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“…They are the artery connecting the whole power grid [1][2] . The overhead ground wire laid above the overhead transmission line is an important device for lightning protection [3] and fault power-frequency current diversion [4] of the transmission line. As the overhead transmission line is located outdoors, it is very vulnerable to external influence.…”

Section: Introductionmentioning

confidence: 99%

Design of Backup Protective Hardware for Suspension Clamp of Electric Power Overhead Ground Wire

Zheng

Yang

et al. 2022

J. Phys.: Conf. Ser.

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Aiming at the disconnection problem of power overhead ground wire caused by wind vibration or the action of power frequency short-circuit current, the newly revised “Eighteen major anti-accident measures of State Grid Corporation China” proposes that independent double string structure should be adopted in suspension clamp of overhead ground wire. Based on this, a research scheme of backup protective hardware for the suspension clamp of the overhead ground wire of the power transmission line is proposed. In this scheme, the backup protective hardware for the suspension clamp is designed and added on the premise that the original overhead ground wire-suspension clamp structure is not changed. It provides backup measures for the original suspension clamp and reduces suspension clamp heating by an electrical shunt. Finally, the mechanical failure load test and salt spray test are performed on the designed production. The results show that the designed production meets the standard and could be used in actual engineering. At the same time, the practical engineering application shows that the backup protective hardware can effectively reinforce the ground wire suspension clamp with double strings, avoiding the problem of dropping and breaking after the original clamp is broken.

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Analysis of Short-Circuit Current Characteristics and Its Distribution of Artificial Grounding Faults on DC Transmission Lines

Cited by 18 publications

References 13 publications

Multiline Fault Current Limiter for DC Line Fault in Multi‐terminal DC Grids

Multiline Fault Current Limiter for DC Line Fault in Multi‐terminal DC Grids

Fault-Tolerant Multiport Converter for Hybrid Distribution Systems: Configuration, Control Principles and Fault Analysis

Design of Backup Protective Hardware for Suspension Clamp of Electric Power Overhead Ground Wire

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