Application of Directional Over Current Protection Schemes Considering the Fault Characteristics in the Distribution System with Dispersed Generation

Jung, Won-Wook; Lee, Hak‐Ju; Kwon, Seong-Chul; Chae, Woo-Kyu

doi:10.5207/jieie.2010.24.9.097

Cited by 4 publications

(1 citation statement)

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“…Let us assume that an unknown fault occurs in the system. First of all, as the protection devices detect the fault current, STS is opened to isolate the microgrid from the main grid, and the operation mode of the microgrid is changed to island mode [15]. Since the STS separates the microgrid from the main grid, the external fault is eliminated at this step.…”

Section: Protection Algorithm For a Facility Microgrid (Zone B)mentioning

confidence: 99%

A Practical Protection Coordination Strategy Applied to Secondary and Facility Microgrids

et al. 2012

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Abstract:In a conventional distribution system, protection algorithms are designed to operate on a unidirectional high fault-current level. In a microgrid, a fault current from distributed generation (DG) may bring about a relay malfunction because of the bidirectional and relatively small fault current. Therefore, the conventional protection scheme is not applicable to microgrids and a new protection method must be developed. In this paper, two protection coordination algorithms which can be applied for facility and secondary microgrids are proposed, respectively. The proposed protection algorithms eliminate faults not by the EMS signal but by directional relays. Moreover, this makes the algorithms flexible regardless of the types and numbers of DG. The proposed protection algorithms were simulated at the KEPCO RI Microgrid Demonstration Site.

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Section: Protection Algorithm For a Facility Microgrid (Zone B)mentioning

confidence: 99%

A Practical Protection Coordination Strategy Applied to Secondary and Facility Microgrids

et al. 2012

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Protection Coordination Strategy of Microgrid Demonstration Site

진대근¹,

최원준²,

원동준³

et al. 2012

The Transactions of The Korean Institute of Electrical Engineer

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-In microgrid demonstration site, distributed generations can make bidirectional power flows on the system. If an accident occurs, the fault current from the inverter based distributed generation is small. However, the conventional protection scheme in distribution network is designed to operate at high fault current. This means that the traditional protection of distribution network is no longer applicable and new protection methods must be developed. In this paper, for two cases, algorithms for protection coordination of demonstration site is proposed and verified through PSCAD/EMTDC simulation. In first case, protection devices are assumed to have the abilities of directional relaying and communication. In second case, protection devices do not have those abilities. Proposed protection coordination algorithms detect the fault locations and protect the microgrid fairly well.

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Faulted Section Identification Method in The Distribution Systems with Renewable Energy Resources

이한성¹,

전철우²,

김영국³

et al. 2014

The Transactions of The Korean Institute of Electrical Engineer

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-Faulted section identification is one of the most important function in distribution automation systems. Conventional over current detection based fault indicators frequently mal-operate due to the reverse fault current from the renewable energy resources. This paper present a new faulted section identification method based on the fuzzy decision making technique. In order to establish feasibility of the proposed method, case studies using Matlab Simulink has been performed.

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Application of Directional Over Current Protection Schemes Considering the Fault Characteristics in the Distribution System with Dispersed Generation

Cited by 4 publications

References 1 publication

A Practical Protection Coordination Strategy Applied to Secondary and Facility Microgrids

A Practical Protection Coordination Strategy Applied to Secondary and Facility Microgrids

Protection Coordination Strategy of Microgrid Demonstration Site

Faulted Section Identification Method in The Distribution Systems with Renewable Energy Resources

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