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Blackout

About: Blackout is a research topic. Over the lifetime, 2088 publications have been published within this topic receiving 30433 citations.


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Proceedings ArticleDOI
28 Dec 2009
TL;DR: This technique is tested on the IEEE system and results proved that the contingency ranking indicates the severity of the voltage stability condition in a power system due to line outage.
Abstract: Voltage stability has recently become a challenging problem for many power systems. Voltage instability is one phenomenon that could happen in power system due to its stressed condition. The result would be the occurrence of voltage collapse which leads to total blackout to the whole system Investigation and online monitoring of power system stability have become vital factors to electric utility suppliers. Suitable preventive control actions can be implemented considering contingencies that are likely to affect the power system performance. An effective method for contingency ranking is proposed in this paper. This method calculates the voltage stability margin considering branch outages. The basic methodology implied in this technique is the investigation of each line of the system through calculating line stability indices. The point at which Voltage Stability Index (VSI) close to unity indicates the maximum possible connected load termed as maximum loadability at the point of bifurcation. This technique is tested on the IEEE system and results proved that the contingency ranking indicates the severity of the voltage stability condition in a power system due to line outage.

6 citations

Journal ArticleDOI
TL;DR: In this article, a new index-based algorithm is proposed for prediction of the catastrophic failures due to line contingencies at a very premature stage, which is capable of identifying the most serious contingencies and can be a good indicator for impending blackout caused by multiple faults/contingencies.
Abstract: Serious impact of catastrophic failure on the power system is demanding one-step-ahead predictive measures in order to save the system. In this paper, a new index-based algorithm is proposed for prediction of the catastrophic failures due to line contingencies at a very premature stage. Offline case studies show that proposed catastrophic failure index (CFI) is proficient in forecasting the possibility of occurrence of the catastrophic failure with a minimum number of contingencies. Proposed CFI can be calculated online from the data available from phasor measurement units. The proposed index is also capable of identifying the most serious contingencies and can be a good indicator for impending blackout caused by multiple faults/contingencies. The proposed methodology has been tested with IEEE 30-bus system to validate the performance.

6 citations

Journal ArticleDOI
TL;DR: The distribution of live births in New York City around the “expected date of confinement,” whether that date be as early as 266 days or as late as 274 days after the Big Blackout, indicates that there probably was a decrease in conceptions during the Blackout and, perhaps, for the greater part of a week thereafter.

6 citations

Proceedings ArticleDOI
01 Oct 2011
TL;DR: There have been 23 large blackouts which have occurred worldwide since 1965 each with a power loss ≥ 8,000MW as discussed by the authors, each of which occurred through two stages: Stage one is related to voltage collapse/transient instability and the reason why most of the instability has occurred is because of the "cascading trips" by impedance relays due to load transfer initiated by a single disturbance and a heavy load superimposed to long distance/high impedance circuits.
Abstract: There have been 23 large blackouts which have occurred worldwide since 1965 each with a power loss ≥8,000MW Blackouts usually occur through two stages: Stage one is related to voltage collapse/transient instability and the reason why most of the instability has occurred is because of the ‘cascading trips’ by impedance relays due to load transfer initiated by a single disturbance and a heavy load superimposed to long distance/high impedance circuits Stage two is that the transient instability may spread out to “blackout” due to ‘cascading trips’ by impedance relays of transmission and out-of-step relays of generators operating during system instability

6 citations

Dissertation
01 Jan 2016
TL;DR: In this article, the authors present a framework that combines three important issues involved in the implementation of islanding: when to island, where to island and what to do after islanding.
Abstract: Power blackouts are a recurring problem worldwide, and research in this area continues to focus on developing improved methods for their prediction and prevention. Controlled islanding has been proposed as a last resort action to save the network before imminent blackouts when the usual means fail in an unexpected manner. Successful controlled islanding has to deal with three important issues that are involved in the implementation of islanding: when to island, where to island and what to do after islanding is implemented in each island. This thesis presents a framework that combines all three issues to achieve successful islanding based on wide area measurement systems (WAMS). In addition, this thesis focuses on the question of when to island. This question is critical to the success of the three-stage controlled islanding scheme because the possible issues of false dismissal and false alarm have to be handled. In false dismissal, islanding is triggered too late. However, the potentially unstable system is still allowed to operate, and this unstable system, which could have survived, may cause uncontrolled cascading blackouts. In false alarm, islanding is triggered too early, and an originally stable system is forced to split into islands, resulting in unnecessary disruption and economic loss. Thus, the early recognition and identification of “the point of no return” before blackout is inevitable. The single machine equivalent (SIME) method is adopted online to predict transient stability during cascading outages that would shortly lead to blackouts, giving support in decisions about when to island in terms of transient instability. SIME also evaluates dynamic stability after islanding and ensures that the selected island candidates are stable before action is taken. Moreover, in this thesis, the power flow tracing-based method provides all possible islanding cutsets, and SIME helps to identify the one that has the best transient stability and minimal power flow disruption. If no possible island cut set exists, corrective actions through tripping critical generators or load shedding are undertaken in each island. The IEEE 10-generator, 39-busbar power system and 16-generator 68-busbar system are used to demonstrate the entire framework of the controlled islanding scheme. The performance of each methodology involved in each stage is then presented.

6 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023178
2022355
202191
2020120
2019121
2018132