Abstract
Fault induced delayed voltage recovery (FIDVR) phenomenon may occur in distribution feeders particularly after clearing short circuit faults. In such a condition, overcurrent relays (OCRs) of healthy feeders may operate incorrectly due to current rise of induction motors. Moreover, OCRs maloperation may occur in microgrids (μGs) after fault initiated islanding events due to FIDVR condition. In this paper, a novel method is proposed to stabilize distribution overcurrent relays against FIDVR, which is based just on feeder current magnitude. The proposed approach consists of two major parts. The first part is employed to properly discriminate FIDVR from other system disturbances, especially short circuit faults. The second part is used to block distribution relays during FIDVR. Threshold parameters of the proposed approach can be determined using the presented analytical studies. Performance of the proposed approach is evaluated under various scenarios including short circuit and islanding events. Variety of simulation-based studies using PSCAD/EMTDC environment fairly reveals security and dependability of the proposed method as compared with a common commercialized industrial relay.
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