Extensive analysis of fault response and extracting fault features for DC microgrids

Nahas, Eatmad W.; el‐Ghany, Hossam A. Abd; Mansour, Diaa‐Eldin A.; Eissa, M.M.

doi:10.1016/j.aej.2020.12.026

Cited by 26 publications

(9 citation statements)

References 43 publications

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“…It means that when a fault occurs, randomly select a circuit in the DC system to disconnect it, and then determine whether the ground fault still exists. If it still exists, it means that the DC circuit is not the circuit that triggers the grounding fault, and the normal power supply should be restored immediately, and the rest of the circuits should be operated in turn until the fault circuit is found [4] . Using this method, should ensure that the DC feeder power disappearance time as short as possible, find the principle of: first outdoor, after the indoor; first break the non-important circuits, after the break the important circuits; first break the newly commissioned equipment, after the break of the other equipment [5] .…”

Section: Pulling Methodsmentioning

confidence: 99%

Ground fault detection in substation DC system based on improved differential current method

Li,

Zhang,

Shen

et al. 2024

J. Phys.: Conf. Ser.

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DC system is the main electrical equipment and control signal system in the substation, and its stability and reliability are directly related to whether the power system can operate safely. This paper firstly introduces the common methods of insulation detection of DC power system in substation and its advantages and disadvantages, and proposes the differential current method based on unbalanced bridge, i.e., using the combination of unbalanced bridge and leakage current sensor to detect the insulation condition of DC system, which makes up for the defects of the traditional differential current method that can only detect the faults of simple branch circuits, and realizes the detection of multi-branch grounding under complex situations. Finally, the feasibility of this method is verified by building a simulation model through simulink.

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Section: Pulling Methodsmentioning

confidence: 99%

Ground fault detection in substation DC system based on improved differential current method

Li,

Zhang,

Shen

et al. 2024

J. Phys.: Conf. Ser.

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“…Compared with AC transmission lines, DC transmission line losses are considerably smaller [9,10], especially over long distances. Despite the numerous advantages of DC power systems compared with AC ones, their faults represent the main challenge for grid operators due to the low inertia [22], large current magnitudes [16], and lack of zero-crossings [14,37], requiring fast protection schemes and specific means for fault current limitation. In this regard, an SFCL can provide an effective solution for such a challenge.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Nevertheless, there are several challenges regarding DC transmission lines, including the absence of zero-crossing points, large fault magnitudes, and rapid rising times [14,15]. When DC transmission lines are fed from PV-based DC systems, the fault response is much faster than that of wind-energy-based DC systems [16] due to the low inertia of PV-based DC systems fed by DC-DC converters [17]. This has driven a significant field of study to improve the effectiveness of DC transmission protection and shorten the working duration of current DC circuit breakers [18].…”

Section: Introduction 1background and Motivationmentioning

confidence: 99%

Impact of Copper Stabilizer Thickness on SFCL Performance with PV-Based DC Systems Using a Multilayer Thermoelectric Model

et al. 2023

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Utilizing renewable energy sources (RESs) to their full potential provides an opportunity for lowering carbon emissions and reaching a state of carbon neutrality. DC transmission lines have considerable potential for the integration of RESs. However, faults in DC transmission lines are challenging due to the lack of zero-crossing, large fault current magnitudes and a short rise time. This research proposes using a superconducting fault current limiter (SFCL) for effective current limitation in PV-based DC systems. To properly design an SFCL, the present work investigates the effect of copper stabilizer thickness on SFCL performance by using an accurate multilayer thermoelectric model. In the MATLAB/Simulink platform, the SFCL has been modeled and tested using different copper stabilizer thicknesses to demonstrate the effectiveness of the SFCL model in limiting the fault current and the impact of the copper stabilizer thickness on the SFCL’s performance. In total, four different thicknesses of the copper stabilizer were considered, ranging from 10 μm to 80 μm. The current limitation and voltage profile for each thickness were evaluated and compared with that without an SFCL. The developed resistance and temperature profiles were obtained for various thicknesses to clarify the mechanisms behind the stabilizer-thickness impact. An SFCL with an 80 µm copper stabilizer can reduce the fault current to 5.48 kA, representing 71.16% of the prospective current. In contrast, the fault current was reduced to 27.4% of the prospective current (2.11 kA) when using a 10 µm copper stabilizer.

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“…The second challenge is the vulnerability to instability in electrical grids with a limited capability of reactive power support from RESs [4]. The third challenge is the low inertia of renewable energy sources causing a deteriorated frequency response, high rising rate of fault currents and weak resistance to power disturbances [5][6][7]. The fourth challenge is the negative impact on the power quality of electrical grids when integrating renewables [8].…”

Section: Introductionmentioning

confidence: 99%

Applications of IoT and digital twin in electrical power systems: A comprehensive survey

Mansour

Numair

Zalhaf

et al. 2023

IET Generation Trans & Dist

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This paper reviews the applications of Internet of Things (IoT) and digital twin technology in electrical power systems. It begins by discussing the generalized IoT value chain, followed by the terminology of smart grid, with clarifying the role of IoT‐systems and the digital twin structure within the Smart Grid. A comparison between different short‐range and long‐range transports is presented. The paper then discusses the use of IoT and digital twin technology for effective energy management with applications in smart homes, smart buildings, smart grids, smart industries (Industry 4.0), smart transportation and smart cities. Additionally, the paper explores the use of IoT and digital twin technology for condition monitoring and diagnosis (CMD) in electrical power systems. Three different cases are presented for CMD, that is, CMD of power transformers, CMD of electrical grids and CMD of substations. IoT and digital twin applications are also highlighted in power electronic systems. Finally, the paper discusses the challenges and opportunities of applying IoT and digital twin technology to electrical power systems and provides recommendations for future research.

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Extensive analysis of fault response and extracting fault features for DC microgrids

Cited by 26 publications

References 43 publications

Ground fault detection in substation DC system based on improved differential current method

Ground fault detection in substation DC system based on improved differential current method

Impact of Copper Stabilizer Thickness on SFCL Performance with PV-Based DC Systems Using a Multilayer Thermoelectric Model

Applications of IoT and digital twin in electrical power systems: A comprehensive survey

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