Journal ArticleDOI
Fault Detection and Isolation in Medium-Voltage DC Microgrids: Coordination Between Supply Power Converters and Bus Contactors
Pietro Cairoli,Roger A. Dougal +1 more
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TLDR
In this article, a fast and effective method for detecting and isolating faults in medium-voltage dc microgrids relies on rapid coordination between power supply converters and bus segmentizing contactors to limit currents and isolate faults without any need for fast communication between these active elements.Abstract:
A fast and effective method for detecting and isolating faults in medium-voltage dc microgrids relies on rapid coordination between power supply converters and bus segmentizing contactors to limit currents and isolate faults without any need for fast communication between these active elements. The power converters independently enter current-limiting mode as soon as they recognize a fault condition and the segmentizing contactors autonomously decide whether or not to open based on their local interpretation of time-to-trip curves as functions of apparent circuit resistance. This method allows converters and contactors to use only local measurements when discerning whether or not to trip in order to isolate the faulted section. Simulation and experimental results show that low-impedance short-circuit faults can be isolated within 10–20 ms and the system can be reenergized within 40–60 ms. The method is effective for a wide range of fault and system configurations, and that range can likely be expanded by applying additional discrimination methods.read more
Citations
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Journal ArticleDOI
Transient Stability of Voltage-Source Converters With Grid-Forming Control: A Design-Oriented Study
TL;DR: A design-oriented transient stability analysis of the grid-forming VSCs is presented, revealing that the PSC and the basic droop control can retain a stable operation as long as there are equilibrium points, due to their noninertial transient responses, while thedroop control with LPFs and the VSG control can be destabilized even if the equilibrium points exist.
Journal ArticleDOI
DC Microgrid Protection: A Comprehensive Review
TL;DR: The challenges of DC microgrid protection are investigated from various aspects including, dc fault current characteristics, ground systems, fault detection methods, protective devices, and fault location methods.
Proceedings ArticleDOI
High Current Solid State Circuit Breaker for DC Shipboard Power Systems
TL;DR: The design and experimental validation of a high current solid state circuit breaker for DC shipboard power systems based on RB-IGCT semiconductor technology which deliver efficiency as high as 99.9%.
Journal ArticleDOI
Self-Powered 380 V DC SiC Solid-State Circuit Breaker and Fault Current Limiter
TL;DR: A new ultrafast dc solid-state circuit breaker that uses a silicon carbide cascode as the main switching and limiting semiconductor and an isolated photovoltaic driver to control it and is able to block a 380 V short circuit failure in 570 ns is presented.
Journal ArticleDOI
Protection of LVDC Microgrids in Grid-Connected and Islanded Modes Using Bifurcation Theory
TL;DR: A protection scheme that is effective for both bolted and high-resistance faults at the LVdc feeders and eliminates the need for the selection of various protection thresholds for different LVdc microgrid structures/topologies is proposed.
References
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Journal ArticleDOI
Low-Voltage Bipolar-Type DC Microgrid for Super High Quality Distribution
TL;DR: In this paper, a low-voltage bipolar-type dc microgrid is proposed to supply super high quality power with three-wire dc distribution line. But, the proposed system is not suitable for large-scale systems.
Journal ArticleDOI
Protection of Low-Voltage DC Microgrids
TL;DR: In this paper, a low-voltage (LV) DC microgrid protection system design is proposed and the operating principles and technical data of LV DC protection devices, both available and in the research stage, are presented.
Journal ArticleDOI
Locating and Isolating DC Faults in Multi-Terminal DC Systems
Lianxiang Tang,Boon-Teck Ooi +1 more
TL;DR: In this paper, the authors propose a handshaking method to locate and isolate the faulted dc line and restore the MTDC without telecommunication, which is shown to be more economical than the dc circuit breakers.
Journal ArticleDOI
DC distribution for industrial systems: opportunities and challenges
Mesut Baran,N.R. Mahajan +1 more
TL;DR: In this paper, the authors investigated the opportunities and challenges associated with adopting a DC distribution scheme for industrial power systems and proposed a grounding scheme and showed that this scheme provides an effective solution by keeping the neutral voltages low under normal conditions and by limiting the fault currents during fault conditions.
Proceedings ArticleDOI
Evaluation of 400V DC distribution in telco and data centers to improve energy efficiency
TL;DR: In this article, the authors present an analytical evaluation of several data center power delivery architectures over a range of loads, showing that a 400 V facility-level DC distribution option is the most efficient.