Ultra-High-Speed Traveling-Wave-Based Protection Scheme for Medium-Voltage DC Microgrids

Saleh, Khaled A.; Hooshyar, Ali; El-Saadany, Ehab F.

doi:10.1109/tsg.2017.2767552

Cited by 122 publications

(36 citation statements)

References 23 publications

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“…A traveling wave-based approach to detect and locate a fault is feasible for high or medium voltage DC transmission networks [17][18][19], but may not be feasible for low voltage DC distribution networks due to their relatively short distribution lines [20]; the end user load switching could also generate noise in the signal or wave. Moreover, fault current limiters using superconductors have been considered in [21][22][23], but their optimal position still needs to be further studied for VSC-based DC distribution networks.…”

Section: Related Workmentioning

confidence: 99%

Protection Scheme of a Last Mile Active LVDC Distribution Network with Reclosing Option

et al. 2018

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A low voltage direct current (LVDC) distribution network is a promising technology to meet the standards of future energy demands for smart loads. An LVDC distribution network can not only supply efficient, smooth and clean energy, but also makes the integration of renewable energy resources in the distribution system easy. A major obstacle in the implementation of the LVDC distribution network is the protection of the network during abnormal grid conditions, such as transients and faults. This paper analyzes DC fault characteristics considering an LVDC distribution network, highlights the worst case scenario during a fault and protection related issues and proposes the protection schemes for the LVDC network. In the proposed protection scheme, a fault is detected and located through superimposed components. To minimize the effect of the DC fault on the distribution network, distributed fault current limiters are introduced and the final decision to disconnect or reconnect the affected line is made on the basis of the type of fault. In addition, a reclosing scheme for a temporary fault is proposed to avoid high inrush currents and false tripping, which eventually increases the reliability. A fast communication-based backup protection is also suggested, and to reduce dependency, a secondary backup is used in the case of communication delay or failure. The proposed scheme is verified using the modified IEEE 13 node test system, which is implemented in ATPDraw. The results show that the proposed scheme can successfully detect, locate and limit a DC fault in an LVDC distribution network with different fault resistances or locations. Moreover, the network is restored successfully in the case of temporary faults.

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Section: Related Workmentioning

confidence: 99%

Protection Scheme of a Last Mile Active LVDC Distribution Network with Reclosing Option

et al. 2018

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“…However, the aforementioned methods work only for long transmission lines, and are not applicable to distribution ones. In [25], a TW‐based method that uses local measurements to detect, classify, and locate DC faults in microgrids has been proposed. However, the approach utilises high‐frequency contents of the fault current signals (few tens of megahertz), which is beyond the bandwidth capability of closed‐loop hall‐effect current transducers, especially under high currents [26].…”

Section: Introductionmentioning

confidence: 99%

Fault detection and location in medium‐voltage DC microgrids using travelling‐wave reflections

Saleh

Hooshyar

El-Saadany

2020

IET Renewable Power Generation

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Fast dc fault detection method is required in medium-voltage dc (MVDC) microgrids to avoid severe damage to the interfacing converters. Ensuring selectivity and sensitivity of the protection system within a few milliseconds is a major challenge. This study proposes a new technique based on fault launched travelling-waves (TWs) to detect, classify, and locate different dc fault types in MVDC microgrids. Unlike the existing TW-based protection and fault location methods, the proposed technique utilises the frequency of TW reflections, rather than their arrival time. Moreover, the fault initiated voltage TW is contained within the faulted line by adding smoothing inductors on line terminals, which (i) prevents relays on adjacent lines from detecting the TW and (ii) results in higher reflected TW magnitudes. Therefore, the proposed method's selectivity and sensitivity are enhanced compared to existing methods. Other salient features of the proposed scheme include a moderate sampling frequency of 2 MHz, detection speed of 128 μs, fault location accuracy of ±25 m, no communication requirement, and independence from system configuration. The proposed scheme's performance has been assessed using a ±2.5 kV TN-S grounded MVDC microgrid under various conditions. The fault location accuracy of the proposed technique is compared to the conventional single-terminal TW-based method.

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“…A number of improvements have been done on protection sensitivity. In [29], a novel TWP method is proposed which is of high protection sensitivity. However, the algorithm needs the highpass filter, and the selection of the pre-defined threshold requires numerous simulations.…”

Section: Introductionmentioning

confidence: 99%

Non‐unit travelling wave protection method for dc transmission line using waveform correlation calculation

Zhang

Song

Yang³

et al. 2020

IET Generation, Transmission & Distribution

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Ultra-High-Speed Traveling-Wave-Based Protection Scheme for Medium-Voltage DC Microgrids

Cited by 122 publications

References 23 publications

Protection Scheme of a Last Mile Active LVDC Distribution Network with Reclosing Option

Protection Scheme of a Last Mile Active LVDC Distribution Network with Reclosing Option

Fault detection and location in medium‐voltage DC microgrids using travelling‐wave reflections

Non‐unit travelling wave protection method for dc transmission line using waveform correlation calculation

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