Fault protection solutions appropriately used for ungrounded low-voltage AC microgrids

Bùi, Dương Minh; Chen, Shilin; Lien, Keng-Yu; Jiang, Joe-Air

doi:10.1109/isgt-asia.2015.7387064

Cited by 4 publications

(6 citation statements)

References 36 publications

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“…Because of that, in the isolated mode of operation, the protective devices may not be activated at all or may work very slowly for any fault condition because there is a large difference of SCC level in comparison with the grid‐connected modes of operation. This significant difference between the SCC magnitudes in both modes of operation makes the single‐setting overcurrent relays incapable to protect the microgrid in dual modes of operation . Furthermore, this motivates to develop better adaptive techniques for the overcurrent relays to cope up with both modes of operation in the presence of inverter‐based DG sources.…”

Section: Challenges Towards the Protection Of Microgridmentioning

confidence: 99%

“…This significant difference between the SCC magnitudes in both modes of operation makes the single-setting overcurrent relays incapable to protect the microgrid in dual modes of operation. 16 Furthermore, this motivates to develop better adaptive techniques for the overcurrent relays to cope up with both modes of operation in the presence of inverter-based DG sources.…”

Section: Challenges In Ac Microgrid Protectionmentioning

confidence: 99%

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Distributed generation hybrid AC/DC microgrid protection: A critical review on issues, strategies, and future directions

2020

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Summary The integration of distributed energy resources (DERs) with conventional systems emerges as an intelligent solution for providing uninterrupted and secure power even at times of high load demand. Better load management with a mature fault handling mechanism makes AC a viable option which has an efficiency of 78.24%. In contrast with less power loss and slightly better efficiency of 84.6%, DC microgrid is a reliable option in a low power environment. In order to accommodate all operating conditions and load types, a hybrid system can be designed with a theoretical efficiency of more than 90%. Bidirectional power flows, low inertia, the transition between different modes of operations are the challenges for the protection of alternating current (AC) and direct current (DC) microgrid systems. Power balance fluctuation, absence of zero‐crossing currents, selection of suitable grounding, and coordination between different rating devices restrict the hybrid system to achieve the said efficiency constantly. This paper reviews in detail of existing protection along with grid‐connected algorithms for both modes of operation. Finally, the limitation, major hurdles, and future course of action for a reliable, efficient, and secure hybrid grid system are figured out.

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Section: Challenges Towards the Protection Of Microgridmentioning

confidence: 99%

Section: Challenges In Ac Microgrid Protectionmentioning

confidence: 99%

Distributed generation hybrid AC/DC microgrid protection: A critical review on issues, strategies, and future directions

2020

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“…It could be adjusted with R 8 by modifying I LED max . On the other hand, t turn-On , could be approximated by Equation (10) and it can be also varied with R 8 . The linear operation of M 1 can be achieved by keeping V GS between the V th and V OC .…”

Section: Sscb-lcl Description and Operating Principlementioning

confidence: 99%

“…One of the key aspects, and one of the most challenging issues in DC microgrids and distribution relates to the protection system design [7]. The differences with AC distribution systems, such as arcing at disconnection [8], large capacitive loads that require high inrush currents and also produce very fast and large discharge electrical currents during low impedance faults [9], limit the use of traditional AC protection methods [10]. Commercial protection devices for DC distribution are typically fuses, Molded Case Circuit Breakers (MCCBs) and Solid State Circuit Breakers (SSCBs), the last group being those that use power semiconductor devices to decrease the tripping time and to increase the current interruption capability [11,12].…”

Section: Introductionmentioning

confidence: 99%

Photovoltaic-Driven SiC MOSFET Circuit Breaker with Latching and Current Limiting Capability

et al. 2019

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This paper introduces a Solid State Circuit Breaker with Latching and Current Limiting capabilities for DC distribution systems. The proposed circuit uses very few electronic parts and it is fully analog. A SiC N-MOSFET driven by a photovoltaic driver and a maximum current detector circuit are the core elements of the system. This work details circuit operation under different conditions and includes experimental validation at 1 kVdc. Wide versatility, highly configurable, and very fast response, less than 1 µs in the case of short-circuit, are the most remarkable outcomes.

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“…Therefore, the protective devices of a microgrid containing inverter-based DG sources would operate very slowly or may not be triggered at all in case of a fault event during islanded mode. In addition, the considerable difference between the magnitudes of short-circuit current in grid-connected and islanded modes makes single-setting traditional overcurrent relays unable to protect dual-mode operating microgrids [24,25]. Therefore, the protection of AC microgrids and subgrids including inverter-based DG sources is not possible using traditional overcurrent protective devices and some new techniques should be devised.…”

Section: Hybrid Ac/dc Microgridsmentioning

confidence: 99%

Challenges, advances and future directions in protection of hybrid AC/DC microgrids

Mirsaeidi

Dong

Shi

et al. 2017

IET Renewable Power Generation

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Hybrid microgrids which consist of AC and DC subgrids interconnected by power electronic interfaces have attracted much attention in recent years. They not only can integrate the main benefits of both AC and DC configurations, but also can reduce the number of converters in connection of distributed generation sources, energy storage systems and loads to AC or DC buses. In this study, the structure of hybrid microgrids is discussed, and then a broad overview of the available protection devices and approaches for AC and DC subgrids is presented. After description, analysis and classification of the existing schemes, some research directions including communication infrastructures, combined control and protection schemes, and promising devices for the realisation of future hybrid AC/DC microgrids are pointed out. 3 Protection challenges in microgrids 3.1 Protection challenges in AC microgrids and subgrids Most conventional distribution systems operate radially, where the power flows unidirectionally from large power plants to the customers. In such systems, since the magnitude of short-circuit

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Fault protection solutions appropriately used for ungrounded low-voltage AC microgrids

Cited by 4 publications

References 36 publications

Distributed generation hybrid AC/DC microgrid protection: A critical review on issues, strategies, and future directions

Distributed generation hybrid AC/DC microgrid protection: A critical review on issues, strategies, and future directions

Photovoltaic-Driven SiC MOSFET Circuit Breaker with Latching and Current Limiting Capability

Challenges, advances and future directions in protection of hybrid AC/DC microgrids

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