A Communication-Assisted Overcurrent Protection Scheme for Radial Distribution Systems With Distributed Generation

Abstract

Conventional overcurrent protection schemes for radial distribution systems usually attempt to coordinate a recloser at the beginning of the feeder with the fuses on the laterals. The integration of distributed generation in distribution systems leads to problems related to protection coordination that are difficult to be solved by applying conventional protection techniques. This paper proposes an efficient communicationbased protection scheme that implements common directional overcurrent relays instead of reclosers at the line, assisted by intertripping and blocking transfer functions. The proposed protection strategy guarantees selectivity regardless of whether the generating units are connected to the network or not, and can be designed retaining either the fuse-blowing or fuse-saving philosophy. Meaningful conclusions are derived from the application of the scheme on a test distribution system.

Influence of fault-ride-through requirements for distributed generators on the protection coordination of an actual distribution system with reclosers

“…However, this is a safe side compromise, which can be taken to fulfill FRT requirements in distribution systems with fuses at the laterals, unless the replacement of the fuses with overcurrent relays is available. The latter, although expensive, would provide significant advantages in the protection system [16].…”

Detection, classification, and location of faults on grid‐connected and islanded AC microgrid

“…Thus, it indicates that the level of fault current will be comparatively very less in the ISM, and thus any protection mechanism must be able to correctly trip the relays for the distribution lines, both in GCM and ISM of operation of the microgrids . The irregular form of power production by the distributed resources in the microgrids significantly enlarges the bandwidth under which the fault current varies, which makes some of the methods like over current relays to be unreliable . With respect to these issues, communication‐based adaptive relaying techniques have been proposed for the microgrid protection, which have been investigated only for GCM, whereas for both GCM and ISM of operation of the microgrid in previous studies, respectively.…”

“…3 The irregular form of power production by the distributed resources in the microgrids significantly enlarges the bandwidth under which the fault current varies, which makes some of the methods like over current relays to be unreliable. [4][5][6] With respect to these issues, communication-based adaptive relaying techniques have been proposed for the microgrid protection, which have been investigated only for GCM, [7][8][9] whereas for both GCM and ISM of operation of the microgrid in previous studies, [10][11][12] respectively. Similar methods based on sequence components need diverse settings for relay synchronization, and thus have high computational complexities.…”

A fast time-frequency response based differential spectral energy protection of AC microgrids including fault location

“…Over current relays [6][7][8], are attractive for GCM of the microgrids, but due to the intermittent nature of the power generation by the DER's, the bandwidth of the FC becomes very wide, which makes them unreliable. In this regard, some communication based protection strategies [9,10], and adaptive relay setting based protection strategies [11,12] have been proposed for microgrids. These strategies are much effective in GCM of operation of the microgrid, but the response for the IM of operation of the microgrid has not been investigated.…”