Integrated protection scheme to coordinate MV distribution network devices, DG interface protections and micro-grids operation

Conti, S.; Raiti, S.

doi:10.1109/iccep.2009.5211987

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…If incase, the faults happens to be within the micro grid, a suitable protective system should be brought into operation immediately. It should be done online, i.e., detection of the fault location and the initiation of protective action within the micro grid [16]. For faults in the main grid the static switch opens and islands the micro grid so that the DGs do not contribute to the fault current.…”

Section: Effect Of Micro Grid Integration With Main Gridmentioning

confidence: 99%

Microgrid Protection Systems

Ramamoorty¹,

Lalitha²

2019

Micro-Grids - Applications, Operation, Control and Protection

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Micro grids are miniature version of conventional large power grids functioning either autonomously or with inter connection to the main grid. Primary function of micro grid is to serve power at distribution level. Distributed energy resources (DERs) connected to the micro grid enables reliable and efficient operation of micro grid. Protection of micro grids assumed importance due to increased penetration of distributed energy resources. Most of the distribution systems in earlier days are radial in nature and protection systems are designed for that. These protection systems pose serious challenges when applied to present day distribution systems which are mesh connected and fed by the distributed energy resources. Limitation of the conventional protection scheme demands new insights and methodologies for micro grid protection. Due to intermediate current injection from DERs the conventional coordination of over current (O/C) relays is not possible. Further in meshed systems the fault current flow is bidirectional. Hence the protection of micro grid systems with DERs require different approach to ensure faults are cleared in less time and minimal number of consumers connected to the system are affected. A comprehensive analysis of the suitable techniques applicable for micro grid protection is presented in this chapter.

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Section: Effect Of Micro Grid Integration With Main Gridmentioning

confidence: 99%

Microgrid Protection Systems

Ramamoorty¹,

Lalitha²

2019

Micro-Grids - Applications, Operation, Control and Protection

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“…No que diz respeito aos trabalhos relacionados à detecção do ilhamento, Conti & Raiti (2009) focam no desenvolvimento de novos critérios para gerenciar as proteções da rede de distribuição com as proteções do ponto de interface do gerador distribuído, de forma coordenada. O esquema de proteção proposto é concebido para evitar o ilhamento não desejado de partes da rede de distribuição e quando necessário permitir a operação ilhada da microrrede formada.…”

Section: Detecção Do Ilhamentounclassified

Avaliação do impacto da geração distribuída sobre o sistema de proteção de sobrecorrente de uma rede de distribuição operando em ilhamento intencional

Sguaçabia¹

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Palavras-chave: geração distribuída, ilhamento intencional, proteção de redes de distribuição. ii iii ABSTRACT SGUAÇABIA, R.R. (2105) Impact Assessment of the Distributed Generation on the Overcurrent Protection System of a Distribution Network Operating in Intentional Islanding. 2015. 137f. Dissertation (Master´s Degree) -Escola de Engenharia de São Carlos, Universidade de São Paulo -USP, São Carlos, 2015. The growing number of distributed generators connected to electricity distribution networks is a reality of electrical systems throughout the world. Although the current policy is to disconnect the distributed generators from the electric power system (EPS) in the event of loss of mains, as required by main national and international technical guides, the module 3 of the Procedures for Electric Power Distribution in the Electric National System (PRODIST) shows itself in favor of islanded operation, it states that this type of operation can be carried out in agreement between power generation plants and the National Electric System Operator (ONS), allowing achieve larger availability in energy supply. However, to make the islanded operation possible and safe, the intentional islanding must overcome some challenges, among which are those related to the protection system of the distribution network, such as improper coordination of protective devices, loss of protection sensitivity, inadequate opening of fuses and automatic reclosing out of synchronism. Therefore, this work evaluates the impact of distributed generation (DG) on the overcurrent protection system of a distribution network operating islanded. The main idea is to divide the network into regions bounded by existing protection devices, to then adapt them to the new operational situation, making sure that the proposed adjustments meet the synchronous and stable behavior of the generation system by means of a transient stability analysis. Thus, a set of procedures is proposed to indicate actions that allow readjusting the existing overcurrent protection system to the islanded operation. The results demonstrate that the inhibition of automatic restart and of the instantaneous operating curve plus adjustments in time delay curves of relays and reclosers, improved the coordination and selectivity of the network operating islanded.

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