Mitigation against overvoltages on a DC marine electrical system

Fletcher, Steven; Norman, Patrick; Galloway, Stuart; Burt, Graeme

doi:10.1109/ests.2009.4906546

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…For highly underdamped networks, v C 2 can reach approximately twice the magnitude of V 1 (0), provided C 1 >> C 2 . However, previous studies by the authors [32,33] have shown that while the voltage difference does have an impact on the transient voltage, if high currents are being interrupted, the dominant term in (25) is likely to be that of the initial current (I 0 ). Taking this into account, (25) shows that the higher the breaking current and the smaller the remaining load capacitance, the greater the magnitude of the subsequent voltage transient.…”

Section: Overvoltage Transientsmentioning

confidence: 98%

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Determination of protection system requirements for DC unmanned aerial vehicle electrical power networks for enhanced capability and survivability

Fletcher

Norman

Galloway

et al. 2011

IET Electr. Syst. Transp.

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112

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This version is available at https://strathprints.strath.ac.uk/33299/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the AbstractA growing number of designs of future Unmanned Aerial Vehicle (UAV) applications utilise dc for the primary power distribution method. Such systems typically employ large numbers of power electronic converters as interfaces for novel loads and generators. The characteristic behaviour of these systems under electrical fault conditions, and in particular their natural response, can produce particularly demanding protection requirements. Whilst a number of protection methods for multi-terminal dc networks have been proposed in literature, these are not universally applicable and will not meet the specific protection challenges associated with the aerospace domain. Through extensive analysis, this paper seeks to determine the operating requirements of protection systems for compact dc networks proposed for future UAV applications, with particular emphasis on dealing with the issues of capacitive discharge in these compact networks. The capability of existing multi-terminal dc network protection methods and technologies are then assessed against these criteria in order to determine their suitability for UAV applications. Recommendations for best protection practice are then proposed and key inhibiting research challenges are discussed.

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Section: Overvoltage Transientsmentioning

confidence: 98%

“…Previous research by the authors has shown how the redistribution of significant amounts of stored inductive energy created during fault conditions can lead to significant post-fault voltage transients propagating throughout the remaining healthy portions of the network, due to the operation of network protection [32,33].…”

Section: Overvoltage Transientsmentioning

confidence: 99%

Determination of protection system requirements for DC unmanned aerial vehicle electrical power networks for enhanced capability and survivability

Fletcher

Norman

Galloway

et al. 2011

IET Electr. Syst. Transp.

Self Cite

112

View full text Add to dashboard Cite

show abstract

“…Voltage-dependent loads, converter control and batteries cause slow front transients. Surge current in the capacitors of the filter causes medium front transient, and transient recovery voltage at the opening of the PDs cause fast front transient [30][31][32][33][34].…”

Section: Faults In DC Microgridsmentioning

confidence: 99%

Protection in DC microgrids: a comparative review

2018

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A direct current (DC) microgrid has become a superior power system in recent years due to the development of DC loads and higher efficiency of DC systems. One of the challenging problems on DC microgrids operation is protection, and it is still a particular concern associated with the challenges of developing a proper protection scheme owing to its characteristics and lack of standards in DC protection. Due to the significant increasing interest on DC microgrid; this study investigates protection problems and schemes that need to be addressed in modern power systems involving DC microgrids. This study analyses and presents a comprehensive review of the most recent growth in the DC microgrids protection. Additionally, the fault characteristics of DC microgrids, the impact of constant power loads, the protection devices and several proposed methods to overcome the protection problems are discussed. The differences between the proposed protection methods for the DC microgrids are also discussed.

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Advanced DC zonal marine power system protection

Jia

Christopher

Thomas

et al. 2014

IET Generation, Transmission & Distribution

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Abstract--A new Active Impedance Estimation (AIE) based protection strategy which is suitable for utilization in a DC zonal marine power distribution system is presented. This method uses two triangular current "spikes" injections for system impedance estimation and protection when faults are detected. By comparing the estimated impedance with the pre-calibrated value, the fault location can be predicted and fault can be isolated without requiring communication between two injection units. Using cooperated double injections and line current measurement (directional fault detection), faults in the system with same impedance and different fault positions can be distinguished, located and isolated. The proposed method is validated using experimental test results derived from a 30kW, 400V, twin bus DC marine power system demonstrator. The experimental tests were applied to both faults during normal operation and faults that occur during system restoration.

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Mitigation against overvoltages on a DC marine electrical system

Cited by 7 publications

References 21 publications

Determination of protection system requirements for DC unmanned aerial vehicle electrical power networks for enhanced capability and survivability

Determination of protection system requirements for DC unmanned aerial vehicle electrical power networks for enhanced capability and survivability

Protection in DC microgrids: a comparative review

Advanced DC zonal marine power system protection

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