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Proceedings ArticleDOI

Power system monitoring based on relay and circuit breaker information

TL;DR: Monitor schemes that are able to detect and identify failures in power transmission lines by analyzing binary status information from relays and circuit breakers are developed.
Abstract: In this paper we develop monitoring schemes that are able to detect and identify failures in power transmission lines by analyzing binary status information from relays and circuit breakers. The approach, which is based on Petri net models, requires very simple calculations (linear checks) during execution time and allows for concurrent/incremental processing of the information as it arrives at the control center.
Citations
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Journal ArticleDOI
01 Mar 2006
TL;DR: The notion of decentralized diagnosis is formalized by introducing the notion of codiagnosability that requires that a failure be detected by one of the diagnosers within a bounded delay.
Abstract: By decentralized diagnosis we mean diagnosis using multiple diagnosers, each possessing its own set of sensors, without involving any communication among diagnosers or to any coordinators. The notion of decentralized diagnosis is formalized by introducing the notion of codiagnosability that requires that a failure be detected by one of the diagnosers within a bounded delay. Algorithms of complexity polynomial in the size of the system and the nonfault specification are provided for: 1) testing codiagnosability, 2) computing the bound in delay of diagnosis, 3) offline synthesis of individual diagnosers, and 4) online diagnosis using them. The notion of codiagnosability and the above algorithms are initially presented in a setting of a specification language (violation of which represents a fault) and are later specialized to the case where faults are modeled as the occurrences of certain events. The notion of strong codiagnosability is also introduced to capture the ability of being certain about both the failure as well as the nonfailure conditions in a system within a bounded delay.

297 citations


Cites background from "Power system monitoring based on re..."

  • ...The application of DES failure diagnosis includes heating, ventilation, and air conditioning systems [27], transportation systems [16], [7], communication networks [3], [1], [17], manufacturing systems [5], [19], digital circuits [15], [31], and power systems [8]....

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Journal ArticleDOI
01 May 2008
TL;DR: Methods by which complexity of testing joint/sub k/ /sup iop/-diagnosability and of on-line diagnosis can be reduced are presented.
Abstract: We study distributed failure diagnosis under a -bounded communication delay, where each local site transmits its observations to other sites immediately after each observation and the transmitted observation is received within at most more event executions of the plant. A notion of diagnosability is introduced so that any failure can be diagnosed within a bounded delay of its occurrence by one of the local sites using its own observations and the -bounded delayed observations received from other local sites. The local sites communicate among each other using an ldquoimmediate observation passing (iop)rdquo protocol, forwarding any observation immediately up on its occurrence. We construct models for the -bounded communication delay and use them to extend the system and nonfault specification models for capturing the effect of bounded-delay communication. By using the extended system and specification models, the distributed diagnosis problem under the immediate observation passing protocol is then converted to a decentralized diagnosis problem of our previous work, where the results are applied for verifying diagnosability and for synthesizing local diagnosers. Methods by which complexity of testing diagnosability and of online diagnosis can be reduced are presented. Finally, we compare the notions of diagnosability, codiagnosability, and diagnosability.

66 citations


Cites background from "Power system monitoring based on re..."

  • ...The application of DES failure diagnosis includes heating, ventilation, and air conditioning systems [19], transportation systems [12], [6], communication networks [2], [1], [13], manufacturing systems [3], [14], digital circuits [11], and power systems [7]....

    [...]

Proceedings ArticleDOI
16 Oct 2006
Abstract: Petri net (PN) is a modeling tool for describing and analyzing discrete-event dynamic systems, and could find applications in many areas such as computer systems, manufacturing systems and power systems. Since 1992, PN has been applied to power systems and paid much attention. So far, many papers associated with PN applications in power systems have been published with many specific areas involved, such as fault diagnosis, power system restoration, distribution network reconfiguration, unit commitment, power network topology analysis, reliability analysis, protective relay modeling and hybrid power systems. In this paper, an effort is made to have a concise and systematic survey on the applications of PN in power systems.

27 citations


Cites methods from "Power system monitoring based on re..."

  • ...An embedding PN, which combines the models proposed in [6-9] with the coding theory, is used to solve the fault diagnosis problem of a simple transmission line in [15,16]....

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  • ...Based on the method developed in [15,16], some improvements are made in [17,18]....

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DissertationDOI
01 Jan 2005
TL;DR: In this paper, the authors propose a novel approach to deal with the problem of plagiarism in online learning.x CHAPTER 6.x ChAPTER 7.1.2.
Abstract: x CHAPTER

17 citations


Additional excerpts

  • ...The application of DESs failure diagnosis includes heating, ventilation, and air conditioning systems [61], trans­ portation systems [41, 15], communication networks [3, 1, 42], manufacturing systems [10, 45], digital circuits [37, 70], and power systems [16]....

    [...]

Dissertation
01 Jan 2006

12 citations

References
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Journal ArticleDOI
TL;DR: In this paper, a complete protection system was designed for the New England 39-bus system and the hidden failure modes were used to develop regions of vulnerability and a vulnerability index, which would help alleviate the problems posed by hidden failures.
Abstract: Major blackouts of electric power systems in which many customers are left without power are rare events. However, the effects of blackouts, for instance, can be catastrophic. It has been observed that protective system failures are a contributing factor in a large proportion of these blackouts. The most troublesome protection system failures are hidden failures, which remain dormant during normal system conditions, and are exposed during system disturbances. A study of hidden failures of the protective systems is undertaken to uncover their modes of failures, and to determine means of supervising their actions in times of highly stressed power system operations. The main contribution of this paper is to develop and document a method of quantitative analysis of the significance of hidden failures of protection systems. A complete protection system was designed for the New England 39-bus system and the hidden failure modes were used to develop regions of vulnerability and a vulnerability index. Through this analysis, critical protection systems, whose hidden failures would have a major impact on cascading failures or blackouts of the power system, can be identified These protection systems are candidates for increased monitoring and control, which would help alleviate the problems posed by hidden failures.

209 citations

Journal ArticleDOI
01 May 1997
TL;DR: A new method of detecting fault locations in power networks using Petri net models that can reduce processing time and increase accuracy when compared with the traditional pattern recognition and hypotheses testing methods is proposed.
Abstract: A new method of detecting fault locations in power networks is proposed. The diagnostic process uses Petri net models. This can reduce processing time and increase accuracy when compared with the traditional pattern recognition and hypotheses testing methods. The method is more able than previous methods to adapt to changing network configurations. The methodology was tested using the IEEE 118-bus standard test system. Fast and accurate results were obtained. The method is very suitable for online applications.

107 citations

Book ChapterDOI
21 Jun 1999
TL;DR: This paper focuses primarily on separate embeddings in which the functionality of the original Petri net is retained in its exact form, and construct monitors that operate concurrently with the original system and allow us to detect and identify different types of failures by performing consistency checks between the state of the originals and that of the monitor.
Abstract: In this paper we discuss a methodology for monitoring failures and other activity in discrete event systems that are described by Petri nets Our method is based on embedding the given Petri net model in a larger Petri net that retains the functionality and properties of the given one, perhaps in a non-separate (that is, not immediately identifiable) way This redundant Petri net embedding introduces "structured redundancy" that can be used to facilitate fault detection, identification and correction, or to offer increased capabilities for monitoring and control We focus primarily on separate embeddings in which the functionality of the original Petri net is retained in its exact form Using these embeddings, we construct monitors that operate concurrently with the original system and allow us to detect and identify different types of failures by performing consistency checks between the state of the original Petri net and that of the monitor The methods that we propose are attractive because the resulting monitors are robust to failures, they may not require explicit acknowledgments from each activity, and their construction is systematic and easily adaptable to restrictions in the available information We also discuss briefly how to construct nonseparate Petri net embeddings

91 citations

Journal ArticleDOI
TL;DR: A hybrid approach to synthesizing solutions for diagnosis and set covering problems from the area of power system operations is described, which combines expert systems written in a rule-based language (OPS5) with algorithmic programs written in C and Lisp.
Abstract: The authors describe a hybrid approach to synthesizing solutions for diagnosis and set covering problems from the area of power system operations. The approach combines expert systems written in a rule-based language (OPS5) with algorithmic programs written in C and Lisp. An environment called DPSK has been developed to allow these programs to be run in parallel on a network of computers. Speed sufficient for real-time applications can be obtained. >

90 citations

Journal ArticleDOI
01 May 1999
TL;DR: In this paper, the Petri net models have been modified to include backup protection as well as primary protection, which is more capable of analysing fault in a highly meshed network or network with more than one layer of protective devices, such as those in substations.
Abstract: In previous work Petri net models were developed by the authors (1977) for detecting fault locations in general. In the current paper, the models have been modified to include backup protection as well as primary protection. The modification overcomes many limitations of the original models. Hence, the advanced models are more capable of analysing fault in a highly meshed network or network with more than one layer of protective devices, such as those in substations. The developed methodology is tested using an actual substation network. Fast and accurate results are obtained, and the proposed method has great potential for on-line applications.

65 citations