Microgrid Protection: Technical challenges and existing techniques

Buigues, G.; Valverde, V.; Zamora, I.; Fernandez, Eugene

doi:10.24084/repqj11.262

Cited by 55 publications

(32 citation statements)

References 31 publications

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“…DG capacity is being limited to its load consumption and will miss the opportunity to sell electric power to DNO when DG has extra power generated or low load consumption. Due to the advantages of FRT, various utility grid companies around the world specify their requirements in their grid code to facilitate large DG penetration [41]. For DG of PV types, FRT capability is found different in various countries, as presented in Table 2.…”

Section: Dg Remains Connected When Faults Happenmentioning

confidence: 99%

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Progress on Protection Strategies to Mitigate the Impact of Renewable Distributed Generation on Distribution Systems

et al. 2017

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Abstract:The benefits of distributed generation (DG) based on renewable energy sources leads to its high integration in the distribution network (DN). Despite its well-known benefits, mainly in improving the distribution system reliability and security, there are challenges encountered from a protection system perspective. Traditionally, the design and operation of the protection system are based on a unidirectional power flow in the distribution network. However, the integration of distributed generation causes multidirectional power flows in the system. Therefore, the existing protection systems require some improvement or modification to address this new feature. Various protection strategies for distribution system have been proposed so that the benefits of distributed generation can be fully utilized. This paper reviews the current progress in protection strategies to mitigate the impact of distributed generation in the distribution network. In general, the reviewed strategies in this paper are divided into: (1) conventional protection systems and (2) modifications of the protection systems. A comparative study is presented in terms of the respective benefits, shortcomings and implementation cost. Future directions for research in this area are also presented.

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Section: Dg Remains Connected When Faults Happenmentioning

confidence: 99%

“…Due to the advantages of FRT, various utility grid companies around the world specify their requirements in their grid code to facilitate large DG penetration [41]. For DG of PV types, FRT capability is found different in various countries, as presented in Table 2.…”

Section: Dg Remains Connected When Faults Happenmentioning

confidence: 99%

Progress on Protection Strategies to Mitigate the Impact of Renewable Distributed Generation on Distribution Systems

et al. 2017

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“…The protection system for traditional distribution networks is based on the assumption of radial network operation which features unidirectional power flow enabling reliable and effective coordination of overcurrent relays. In the last decade, however, with high penetration of DERs in distribution systems and the fact that many of them can operate in a microgrid mode, the assumption of unidirectional power flow might be invalid …”

Section: Introductionmentioning

confidence: 99%

Voltage‐based protection of microgrids using decision tree algorithms

Ranjbar

Farsa

Jamali

2019

Int Trans Electr Energ Syst

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Summary This paper presents a protection method for microgrids by data mining of voltage disturbances. The occurrence of a fault on the system is associated with a sudden voltage depression, which is fast detected by the adaptive cumulative sum (ACUSUM) algorithm. There are other operational (no‐fault) events causing voltage depression such as motor starting, transformer energizing, and capacitor or heavy load switching. In order to discriminate between the fault and no‐fault events, one cycle of the voltage waveform is preprocessed by the short‐time Fourier transform (STFT) to extract and construct effective features of the disturbance. The features are then used in the decision trees (DTs) for the discrimination. The proposed protection method is tested for fault or no‐fault conditions of grid‐connected or islanded mode of the microgrid operation, as well as radial or meshed topology. The proposed method also identifies the fault type and faulted phase(s) for selective phase tripping. The immunity of the method against different noise levels is investigated. It is shown by the simulation study that by using only two features for symmetrical events and six features for asymmetrical events, any fault can be detected accurately.

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“…Compared to the traditional power grid, the microgrid has more flexible operating modes, lower voltage level, and a smaller distribution network. These characteristics demand new requirements for microgrid protection configuration, which cannot be satisfied completely by protection methods used in traditional distribution networks .…”

Section: Introductionmentioning

confidence: 99%

Microgrid protection based on principle of fault location

Han

Jiang

et al. 2015

IEEJ Transactions Elec Engng

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Island‐capable microgrids can potentially enhance the efficiency of distributed generations. In general, protection schemes in traditional distribution network cannot meet the requirements of microgrid internal protection. In order to solve the problem, this paper proposes the positive‐sequence fault component of current as the starting criterion. And a graph model describing the overall structure of a microgrid is established. The information about fault currents, including amplitude and direction, is acquired to locate fault branch. Furthermore, a new matrix algorithm is used to locate the fault point, so that the fault can be isolated. Finally, a microgrid model is simulated in the PSCAD/EMTDC software environment to illustrate the validity of fault location principle in microgrid protection. © 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Microgrid Protection: Technical challenges and existing techniques

Cited by 55 publications

References 31 publications

Progress on Protection Strategies to Mitigate the Impact of Renewable Distributed Generation on Distribution Systems

Progress on Protection Strategies to Mitigate the Impact of Renewable Distributed Generation on Distribution Systems

Voltage‐based protection of microgrids using decision tree algorithms

Microgrid protection based on principle of fault location

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