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This paper proposes a method for identifying event sequences leading to blackouts in power systems. To identify the cascades, grid is modeled like an event tree where each branch represents a contingency and each node represents state of the system. Due to huge number of possible paths in the event tree, computational burden is the key issue in searching the cascades. In this paper, computational...
A typical power system voltage collapse scenarios is often ended with the undesirable operation of the Zone-3 distance relay of the transmission lines. This paper presents a protection scheme to avoid power system voltage collapse using a combined method of distance relay's Zone-3 blocking scheme and a sensitivity-based load shedding selection. The Zone-3 distance relay blocking is based on the proper...
This paper examines the role of stability analysis in planning studies for North American power systems. The uses of stability analysis are explored, and the types of issues raised by these analyses are discussed. Such issues include first-swing instability, undamped oscillations, cascading by relay action, system integrity protection scheme (SIPS) performance, and islanding performance. Recent examples...
This is a summary for presentation in the panel session, ldquoUnderstanding, Prediction, Mitigation and Restoration of Cascading Failuresrdquo at IEEE PES PSCE 2009. Recent major blackouts in North America, Europe, and other countries highlight the importance of reliability of our electric energy infrastructure and the economic impact of blackouts. These blackouts were caused by a cascading sequence...
Electric power systems are complex systems with Self-Organized Criticality (SOC) that are commonly run near their operational limits. In these systems, blackout is unavoidable. One of the main causes for some of the recent blackouts around the world was distance relay hidden failure. In this paper a novel approach is proposed to prevent the undesirable contribution of distance relay on cascading failures...
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