Optimizing the Roles of Unit and Non-unit Protection Methods Within DC Microgrids

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

doi:10.1109/tsg.2012.2198499

Cited by 192 publications

(79 citation statements)

References 17 publications

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“…Another publication [42] argues for the use of unit protection in more complex DC microgrids to achieve better fault discrimination. This necessitates the use of additional communication and relay technology.…”

Section: Ieds Communication and Differential Protectionmentioning

confidence: 99%

Transient analysis of DC distribution grids

Petropoulos

Mackay

Ramírez-Elizondo

et al. 2017

2017 IEEE Second International Conference on DC Microgrids (ICDCM)

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The latest developments in power electronics along with the increased generation from Renewable Energy Sources (RES), the new prosumers who both generate and consume electricity and the rapid adoption of DC loads in the household are forcing us to rethink the manner with which power is distributed and consumed. The proposal to make DC technology an integral part of the distribution network seems to have more merit. This change would lead to energy savings in power conversion and enable the creation of meshed DC grids, highly controllable and flexible networks which will be able to facilitate the more sustainable energy future towards which we strive. To build such a system, however, a different approach than the one used in AC systems is needed, due to the peculiarities of DC technology. In our research for the best possible way to protect these systems, it is imperative to constantly test the protection circuit not only as a standalone, but also incorporate it in the systems that will be built and test them together. In other words, transient analysis of the systems with the proposed protection included is an integral part in gauging the impact of the latter on the former during operation, and therefore in assessing and improving the protection for this specific application.This thesis presents such a transient analysis of various configurations of DC distribution systems. A combination of theoretical and practical methods were used to investigate the behavior of the systems' variables after the occurrence of faults and current interruption. A number of networks of varying complexity were built with detailed cable models using the EMTP/ATP software package in order to simulate a multitude of faults and assess each network's response at various positions and most crucially, the effectiveness of the protection scheme in reducing the impact of the transients after the fault. The travel speed of the transients was also investigated. At the same time, a set of measurements was conducted on a DC street lighting network to study the transient behavior of a real system. A separate model was built to resemble the measured system, in order to compare between the simulations and the measurements. The evaluation of the measurement and simulation results led to conclusions that will contribute to the creation of better, safer and more versatile DC distribution grids. The comparison showed that the models used can approach the behavior of the real system to a reasonable degree. The other simulations indicated that the transient impact is significantly smaller in locations far from the fault, but continued operation of the healthy pole cannot be guaranteed, especially after earth faults. Dimitrios Petropoulos Delft, September 2016iii ACKNOWLEDGEMENTS

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Section: Ieds Communication and Differential Protectionmentioning

confidence: 99%

Transient analysis of DC distribution grids

Petropoulos

Mackay

Ramírez-Elizondo

et al. 2017

2017 IEEE Second International Conference on DC Microgrids (ICDCM)

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“…Reference [8] had investigated a range of protection solutions and reported that the differential current scheme is suitable for the DC system. Differential protection has highest selectivity, and only operates in case of internal fault.…”

Section: Introductionmentioning

confidence: 99%

A new protection scheme for DC microgrid using line current derivative

Meghwani

Srivastava

Chakrabarti

2015

2015 IEEE Power &Amp; Energy Society General Meeting

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Protection scheme for AC transmission systems are well understood and matured. On the other hand, DC system is still facing a challenge in developing proper protection scheme because of its natural characteristics. A protection scheme, which utilizes some of the developed techniques for AC system, and modified to suit the DC system characteristics, is proposed in this paper. The scheme is based on the concept of DC current profile under transients, which depends on the fault location. This property is combined with the directional feature to achieve the protection of a DC microgrid. The proposed scheme is demonstrated on the ring type DC microgrid system, which is able to detect the fault in the DC system, and also ensure its backup protection. The proposed concept is verified and tested through MATLAB/Simulink simulations.Index Terms -DC Microgrid, system protection, fault current.

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“…Due to fast fault protection and control requirements, timely fault detection, location, and coordination methods, are challenging for DC protection [9][18] [29]- [43]. An overview of different protection methods for DC protection can be found in [9] [29].…”

Section: Introductionmentioning

confidence: 99%

“…An overview of different protection methods for DC protection can be found in [9] [29]. Traditional overcurrent and di/dt protection [30]- [33] can still be applied in some distribution networks.…”

Section: Introductionmentioning

confidence: 99%

“…Traditional overcurrent and di/dt protection [30]- [33] can still be applied in some distribution networks. Distance protection methods were proposed as an alternative effective fault location method by some researchers [18] [29][34]- [36] using different fault distance estimation and calculation principles. Converter fault current control together with DC fault isolation and restoration actions were also proposed by other researchers [29][37]- [43].…”

Section: Introductionmentioning

confidence: 99%

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Design issues and practical application challenges of DC shipboard distribuiton system protection

Liang

2015

2015 IEEE Electric Ship Technologies Symposium (ESTS)

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This paper gives an overview on issues and challenges of DC shipboard distribution protection. Typical fault characteristics in DC shipboard distribution systems are determined by different sources at DC faults. Issues in protection design include fast and accurate fault current estimation, fast and selective fault location methods, and effective fault current control. One main challenge in practical applications of DC protection is cost effectiveness, which impacts applications of DC distribution technology.

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Optimizing the Roles of Unit and Non-unit Protection Methods Within DC Microgrids

Cited by 192 publications

References 17 publications

Transient analysis of DC distribution grids

Transient analysis of DC distribution grids

A new protection scheme for DC microgrid using line current derivative

Design issues and practical application challenges of DC shipboard distribuiton system protection

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