Adaptive Protection System for Microgrids: Protection practices of a functional microgrid system

Che, Liang; Khodayar, Mohammad E.; Shahidehpour, Mohammad

doi:10.1109/mele.2013.2297031

Cited by 191 publications

(82 citation statements)

References 4 publications

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“…Considering high integration of DGs, fault currents measured by protective relays significantly depend on microgrid configuration structure, operation modes, and existence of DGs in microgrid. Because of this, the protection of microgrid is probably the most important challenge for its realization [5], [6].…”

Section: Introductionmentioning

confidence: 99%

Fault location in microgrids: a communication‐based high‐frequency impedance approach

Beheshtaein¹,

Cuzner

Savaghebi³

et al. 2019

IET gener. transm. distrib.

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This paper proposes a novel method to locate faults in an AC meshed microgrid. To this end, a set of features is first extracted and selected from the measured signals and fed to a Support Vector Machine (SVM) to detect the occurrence of fault. Then, the Distributed Generator (DG) with the lowest amount of fundamental voltage, which is the closest one to the fault, injects an appropriate voltage/current harmonic. As the faulted section has the lowest impedance value from the PCC of the DG, the harmonic current of the corresponding line has the highest value. Based on this fact, the first candidate DG sends a notification signal to the second candidate DG, which the fault occurs between them. Finally, the impedances in the injected frequency are measured from these two DGs and fed into a multi-class SVM to locate the faulted line. The proposed method has the ability to locate faults for islanded and grid-connected microgrids with variable configurations. Real-time simulation results are taken by OPAL-RT to show the effectiveness of the proposed method in the meshed microgrid.

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Section: Introductionmentioning

confidence: 99%

Fault location in microgrids: a communication‐based high‐frequency impedance approach

Beheshtaein¹,

Cuzner

Savaghebi³

et al. 2019

IET gener. transm. distrib.

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“…PVDGs have limited fault currents to which the overcurrent elements are normally insensitive [2]. Various publications offer protection solutions for microgrids by means of adaptive and communicationassisted techniques [3]- [5]. Despite their successful fault detection, these methods do not provide information on the fault type.…”

Section: Introductionmentioning

confidence: 99%

Fault Type Classification in Microgrids Including Photovoltaic DGs

Hooshyar

El-Saadany

Sanaye‐Pasand

2016

IEEE Trans. Smart Grid

125

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Protective devices of smart and fault-resilient microgrids are not expected to trip the healthy phases during unbalanced short-circuits. Thus, some utilities and relay manufacturers have started contemplating single-and double-pole tripping for distribution systems. Selective phase tripping demands fault type classification. This paper reveals that existing industrial methods misidentify the fault type in microgrids that include photovoltaic distributed generations (DGs). Due to interface similarities, this paper pertains to systems with type IV wind DGs as well. Two new classifiers proposed in this paper determine the fault type accurately for not only microgrids with photovoltaic DGs, but for any three-phase system. With low computational burden, they require only local information and operate successfully for high resistance faults. Furthermore, these techniques are not affected by the system imbalance and different DG power factors over disturbances.

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“…The communication-based methods solve the protection problem by automatically adjusting the relay settings by means of online communication systems [17][18][19][20]. However, a synchronous generator-based DER is required to provide a sufficient fault current for protection.…”

Section: Introductionmentioning

confidence: 99%

“…However, a synchronous generator-based DER is required to provide a sufficient fault current for protection. The authors of [17,18] presented an adaptive protection scheme for a university campus microgrid using communication-assisted relays. A hierarchical protection scheme was proposed.…”

Section: Introductionmentioning

confidence: 99%

A Novel Protection Method for Single Line-to-Ground Faults in Ungrounded Low-Inertia Microgrids

et al. 2016

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This paper proposes a novel protection method for single line-to-ground (SLG) faults in ungrounded low-inertia microgrids. The proposed method includes microgrid interface protection and unit protection. The microgrid interface protection is based on the difference between the zero-sequence voltage angle and the zero-sequence current angle at the microgrid interconnection transformer for fast selection of the faulty feeder. The microgrid unit protection is based on a comparison of the three zero-sequence current phase directions at each junction point of load or distributed energy resources. Methods are also included to locate the minimum fault section. The fault section location technology operates according to the coordination of microgrid unit protection. The proposed method responds to SLG faults that may occur in both the grid and the microgrid. Simulations of an ungrounded low-inertia microgrid with a relay model were carried out using Power System Computer Aided Design (PSCAD)/Electromagnetic Transients including DC (EMTDC).

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Adaptive Protection System for Microgrids: Protection practices of a functional microgrid system

Cited by 191 publications

References 4 publications

Fault location in microgrids: a communication‐based high‐frequency impedance approach

Fault location in microgrids: a communication‐based high‐frequency impedance approach

Fault Type Classification in Microgrids Including Photovoltaic DGs

A Novel Protection Method for Single Line-to-Ground Faults in Ungrounded Low-Inertia Microgrids

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