Zone 3 Relay Blocking Scheme to Prevent Cascaded Events
Zone 3 Relay Blocking Scheme to Prevent Cascaded Events作者机构:Department of Electrical EngineeringKyungnam UniversityMasanKorea
出 版 物:《Transactions of Tianjin University》 (天津大学学报(英文版))
年 卷 期:2008年第14卷第2期
页 面:97-105页
核心收录:
学科分类:080802[工学-电力系统及其自动化] 0808[工学-电气工程] 08[工学]
主 题:blackouts cascaded events defense system distance relay Zone 3 relay
摘 要:Defense systems are needed to prevent catastrophic failures of a power grid due to cascaded events. Cascaded events can be attributed to improper operations of protective relays. The most challenging problem for the design and implementation of a defense system is the performance in accuracy and speed in a real time environment. Protective devices are normally designed to operate fast in order to isolate the fault(s). This paper proposes a new methodology to distinguish line overloads from actual faults for distance relays. In order to distinguish between line flow transfers from a line outage and an actual fault, the line outage distribution factor (LQDF) and generation shift factor (GSF) based power flow estimation method, and a secure peer to peer (P2P) communication structure are adopted. Computer simulations of cascaded events for a 6-bus system and the Korean power grid have been performed to establish the feasibility of the proposed scheme.