A case study for controlled islanding based on line contingency ranking in autonomous micro-grids

Kirthiga, M. Venkata; Muppiddi, Pramodkumar

doi:10.1109/afrcon.2013.6757794

Cited by 2 publications

(1 citation statement)

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“…The purpose of this is to limit fault paths and allow for simple coordination of inverse time overcurrent relays [3,4]. However, autonomous microgrids may introduce meshed components to satisfy contingency requirements [5]. Additionally, in the case of remote outposts, the microgrid must be meshed to avoid loss of service when under emergency situations [6].…”

Section: Introductionmentioning

confidence: 99%

A Graph Theory Method for Identification of a Minimum Breakpoint Set for Directional Relay Coordination

2019

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The energy grid becomes more complex with increasing penetration of renewable resources, distributed energy storage, distributed generators, and more diverse loads such as electric vehicle charging stations. The presence of distributed energy resources (DERs) requires directional protection due to the added potential for energy to flow in both directions down the line. Additionally, contingency requirements for critical loads within a microgrid may result in looped or meshed systems. Computation speeds of iterative methods required to coordinate loops are improved by starting with a minimum breakpoint set (MBPS) of relays. A breakpoint set (BPS) is a set of breakers such that, when opened, breaks all loops in a mesh grid creating a radial system. A MBPS is a BPS that consists of the minimum possible number of relays required to accomplish this goal. In this paper, a method is proposed in which a minimum spanning tree is computed to indirectly break all loops in the system, and a set difference is used to identify the MBPS. The proposed method is found to minimize the cardinality of the BPS to achieve a MBPS.

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