Study on Adaptive Distance Relay to Prevent Cascading Trips in Complex Power Grid

Abstract:

Cascading trips caused by flow transferring are the crucial reason for a lot of well-known blackouts. Aiming at the distance relay which is most applied in power grid, this paper puts forward an adaptive setting scheme to prevent cascading trips in complex power grid. In this paper, using two-port network model to fast calculating apparent impedance, and than calculating the apparent impedance change rate which is caused by flow transferring. According to the apparent impedance change rate modify the setting value which would contract the range of the impedance circle. After accomplishing the contraction, the relay action check will start. Through the process of modification and checking, the adaptive setting scheme which is not affected by the flow transferring will be formed. Taking the New England 10-unit 39-bus system which also used this method as the example, in this case, this method is confirmed by the BPA simulation.

• Periodical: Applied Mechanics and Materials (Volume 472)
• Pages: 353-358
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.472.353
• Online since: January 2014
• Authors: Song Lin Gu, Zeng Ping Wang
• Keywords: Adaptive Distance Relay, Cascading Trips, Flow Transferring

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