Enhanced Protection Selectivity in LVDC networks using a Superconducting Resistance

McGuckin, Patrick; Wang, Dong

doi:10.1109/icdcm45535.2019.9232870

Cited by 2 publications

(1 citation statement)

References 10 publications

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“…The authors of [9][10][11][12] studied the short-circuit protection of power electronic devices, and the authors of [13][14][15][16][17][18] conducted studies online protection and protection selectivity during short circuits. In [19][20][21], the researchers studied several fault location methods based on short-circuit currents. Methods of limiting the shortcircuit current were proposed by [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Research on Dynamic and Thermal Effects Based on the Calculation of the Short-Circuit Current in Low-Voltage DC Distribution Systems for Civil Buildings

Wei,

Ni,

Feng

et al. 2023

Applied Sciences

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The verification of short-circuit effects is very important for ensuring the safety of equipment and power systems. Compared with that in alternating current (AC) systems, research on this issue in direct current (DC) systems is scarce, and it is urgently necessary to develop an accurate verification method for applications in DC systems. This research establishes an equivalent model of a pole–pole cable short-circuit according to the characteristics of low-voltage DC distribution systems in civil buildings. Through theoretical analysis and numerical simulation, the development process of a short circuit is summarized, and the methods of verifying dynamic and thermal effects based on the time-domain characteristics of the short-circuit current are specified. By calculating the peak value and Joule integral of the short-circuit current, in comparison with those in the IEC 61660 (1997) standard, this research points out that the method in the IEC 61660 (1997) standard is insufficient. Finally, the short-circuit peak current is greatly affected by the DC-link capacitance, the steady-state current is directly related to the filter inductance of the AC-link; and the verification of the thermal effect requires the calculation of the Joule integral in the transient and steady state.

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Section: Introductionmentioning

confidence: 99%

Research on Dynamic and Thermal Effects Based on the Calculation of the Short-Circuit Current in Low-Voltage DC Distribution Systems for Civil Buildings

Wei,

Ni,

Feng

et al. 2023

Applied Sciences

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Reducing Microgrids Integration Complexity in Distribution Networks Considering Bidirectional Power Flow in SFCLs

Elsamahy

2022

IEEE Access

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In this paper, investigations are carried out to explore the application of the well-known unique bidirectional power flow nature of superconducting fault current limiters (SFCLs) to reduce the complexities of integrating microgrids into distribution networks. More specifically, their adverse impact on the coordination of existing protection of distribution networks, as well as the complexity of setting their internal protection to handle the change in fault current due different modes of operation. In this context, the capability of the proposed SFCL scheme is tested while demonstrating the tandem operation of the utility distribution network and microgrid protection systems and problems related to sensitivity and selectivity are addressed. In addition, different fault contingencies are considered, namely, faults located on the incoming main-lateral connecting the microgrid to the distribution network (where the fault is between the distribution substation protection and the microgrid) and on an adjacent main-lateral from the same main feeder (where the microgrid is located between the distribution substation protection and the fault). Moreover, other faults are located inside the microgrid on a local-line and at a local end-user. Results have shown the efficiency of the proposed SFCL scheme in reducing the short circuit contributions of both the microgrid and the utility network within the coordination limits depending on the direction of flow into the point of connection (PoC). Thus, it allowed a safe continuous integration of microgrids in distribution networks during faulted conditions, while, simultaneously permitted the microgrid to utilize a single protection setting to handle the changes in short circuit current levels when transitioning between gridconnected and islanded modes of operation. The time-domain simulation studies are conducted using PSCAD/EMTDC software.

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Enhanced Protection Selectivity in LVDC networks using a Superconducting Resistance

Cited by 2 publications

References 10 publications

Research on Dynamic and Thermal Effects Based on the Calculation of the Short-Circuit Current in Low-Voltage DC Distribution Systems for Civil Buildings

Research on Dynamic and Thermal Effects Based on the Calculation of the Short-Circuit Current in Low-Voltage DC Distribution Systems for Civil Buildings

Reducing Microgrids Integration Complexity in Distribution Networks Considering Bidirectional Power Flow in SFCLs

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