The authors describe an expert system which assists the security control of an electric power system. The expert system first judges the power system operating conditions based on its voltage profile and line flow patterns and then displays possible control actions to be chosen by operators. The salient features of this expert system are: (1) power system components are expressed by frames with a hierarchical structure; (2) production rules are grouped according to system states for efficient inference; and (3) conventional FORTRAN software is effectively incorporated into the expert system. The proposed production-rule classification has enabled easy addition and/or modification of knowledge bases.<>
{"title":"An expert system for power system security control","authors":"H. Sasaki, N. Yorino, R. Yokoyama","doi":"10.1109/PICA.1989.39004","DOIUrl":"https://doi.org/10.1109/PICA.1989.39004","url":null,"abstract":"The authors describe an expert system which assists the security control of an electric power system. The expert system first judges the power system operating conditions based on its voltage profile and line flow patterns and then displays possible control actions to be chosen by operators. The salient features of this expert system are: (1) power system components are expressed by frames with a hierarchical structure; (2) production rules are grouped according to system states for efficient inference; and (3) conventional FORTRAN software is effectively incorporated into the expert system. The proposed production-rule classification has enabled easy addition and/or modification of knowledge bases.<<ETX>>","PeriodicalId":371044,"journal":{"name":"Conference Papers Power Industry Computer Application Conference","volume":"155 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128827575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. J. Boratynska-Stadnicka, M. Lauby, J. V. Van Ness
The authors describe the utilization of SYREL, a computer program which finds the upper and lower bounds on the reliability indices for an electric utility system. It tests a list of contingencies for violations of line loadings or voltage limits, and then uses the results from that to compute the reliability indices by a tree search. These two parts of the program have been modified to run on a hypercube computer. A major change that had to be made in the program in order to utilize the capability of the hypercube was to move the storage of the contingency evaluation results that would be used in the tree enumeration from the disk to the large memory available in each node. A commercial unit, the iPSC/1-MXD4, was used in the program development. A later and more powerful model, the iPSC/2, became available for testing at the end of the project, and test results on it are included.<>
{"title":"Converting an existing computer code to a hypercube computer","authors":"D. J. Boratynska-Stadnicka, M. Lauby, J. V. Van Ness","doi":"10.1109/PICA.1989.39022","DOIUrl":"https://doi.org/10.1109/PICA.1989.39022","url":null,"abstract":"The authors describe the utilization of SYREL, a computer program which finds the upper and lower bounds on the reliability indices for an electric utility system. It tests a list of contingencies for violations of line loadings or voltage limits, and then uses the results from that to compute the reliability indices by a tree search. These two parts of the program have been modified to run on a hypercube computer. A major change that had to be made in the program in order to utilize the capability of the hypercube was to move the storage of the contingency evaluation results that would be used in the tree enumeration from the disk to the large memory available in each node. A commercial unit, the iPSC/1-MXD4, was used in the program development. A later and more powerful model, the iPSC/2, became available for testing at the end of the project, and test results on it are included.<<ETX>>","PeriodicalId":371044,"journal":{"name":"Conference Papers Power Industry Computer Application Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125001857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The authors describe a prototype for a hybrid expert system developed to provide advice to station operators in real time. The domain of this expert system is transmission planning as applied to real-time operation. It consists of symbolic and procedural modules that address a variety of electrical concerns at generating stations, including breaker thermal duties, breaker fault duties, and voltage-critical load buses. Once the system is invoked, the prevailing operating state is evaluated for static security-limit violations. If any violations are encouraged, the system searches its knowledge base for plausible plans to alleviate the problem.<>
{"title":"Decision support system for substation operation","authors":"I. Dabbaghchi, Richard J Gursky","doi":"10.1109/PICA.1989.38988","DOIUrl":"https://doi.org/10.1109/PICA.1989.38988","url":null,"abstract":"The authors describe a prototype for a hybrid expert system developed to provide advice to station operators in real time. The domain of this expert system is transmission planning as applied to real-time operation. It consists of symbolic and procedural modules that address a variety of electrical concerns at generating stations, including breaker thermal duties, breaker fault duties, and voltage-critical load buses. Once the system is invoked, the prevailing operating state is evaluated for static security-limit violations. If any violations are encouraged, the system searches its knowledge base for plausible plans to alleviate the problem.<<ETX>>","PeriodicalId":371044,"journal":{"name":"Conference Papers Power Industry Computer Application Conference","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115540583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The authors describe a project in which the capabilities of fast phasor measurements were applied to power system problems. They describe the phasor measurement units and the central host of the monitoring system, the expected kinds of power system dynamics that are sensed and recorded, the anticipated triggering problems, and an analysis of initial siting considerations. In addition, the following applications of phasor measurement are discussed: disturbance monitoring, system protection and state estimation.<>
{"title":"Applications of fast phasor measurements on utility systems","authors":"R. Schulz, L. Vanslyck, S. Horowitz","doi":"10.1109/PICA.1989.38973","DOIUrl":"https://doi.org/10.1109/PICA.1989.38973","url":null,"abstract":"The authors describe a project in which the capabilities of fast phasor measurements were applied to power system problems. They describe the phasor measurement units and the central host of the monitoring system, the expected kinds of power system dynamics that are sensed and recorded, the anticipated triggering problems, and an analysis of initial siting considerations. In addition, the following applications of phasor measurement are discussed: disturbance monitoring, system protection and state estimation.<<ETX>>","PeriodicalId":371044,"journal":{"name":"Conference Papers Power Industry Computer Application Conference","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114138794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A review is provided of the sparse formulation of the transient energy function direct stability method with emphasis placed on the issue of mode-of-disturbance selection. The approximate procedure for maximizing the potential energy margin is presented. This is verified by comparative simulations with time-domain techniques. The variations of worst voltage dips and transient energy margins with fault clearing times are illustrated. An application involving the use of postfault capacitor switching to improve the voltage dip stability margin is described. A simplified voltage dip computational approach is proposed and illustrated. All these developments are used in a specification for a modified direct stability program with voltage dip criteria for stability assessment and enhancement.<>
{"title":"Voltage dip at maximum angular swing in the context of direct stability analysis (of power systems)","authors":"A. Debs","doi":"10.1109/PICA.1989.39018","DOIUrl":"https://doi.org/10.1109/PICA.1989.39018","url":null,"abstract":"A review is provided of the sparse formulation of the transient energy function direct stability method with emphasis placed on the issue of mode-of-disturbance selection. The approximate procedure for maximizing the potential energy margin is presented. This is verified by comparative simulations with time-domain techniques. The variations of worst voltage dips and transient energy margins with fault clearing times are illustrated. An application involving the use of postfault capacitor switching to improve the voltage dip stability margin is described. A simplified voltage dip computational approach is proposed and illustrated. All these developments are used in a specification for a modified direct stability program with voltage dip criteria for stability assessment and enhancement.<<ETX>>","PeriodicalId":371044,"journal":{"name":"Conference Papers Power Industry Computer Application Conference","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133974212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Calicchio, M. Rodrigues, A.V. Garcia, A. Morelato, A. Monticelli
A status report is presented on a project aimed at implementing new technologies, such as concurrent processing, object-oriented programming, and artificial intelligence techniques, in distribution system control centers. The applications functions include monitoring, diagnosing, switching, and service restoration. A major concern in implementing such technologies is how best to interface existing software (number crunching) with the new tools. The project investigates the possibility of solving the integration problem by using conventional language extensions for coding the new applications. All the required extensions are based on a distributed real-time system which supports process-spawning and message-passing. This project forms part of a more general effort which includes applications to a broader class of power system problems and to such areas as the real-time control of telephony switching systems.<>
{"title":"An evolutionary approach to applications software for distribution power system control centers","authors":"S. Calicchio, M. Rodrigues, A.V. Garcia, A. Morelato, A. Monticelli","doi":"10.1109/PICA.1989.38986","DOIUrl":"https://doi.org/10.1109/PICA.1989.38986","url":null,"abstract":"A status report is presented on a project aimed at implementing new technologies, such as concurrent processing, object-oriented programming, and artificial intelligence techniques, in distribution system control centers. The applications functions include monitoring, diagnosing, switching, and service restoration. A major concern in implementing such technologies is how best to interface existing software (number crunching) with the new tools. The project investigates the possibility of solving the integration problem by using conventional language extensions for coding the new applications. All the required extensions are based on a distributed real-time system which supports process-spawning and message-passing. This project forms part of a more general effort which includes applications to a broader class of power system problems and to such areas as the real-time control of telephony switching systems.<<ETX>>","PeriodicalId":371044,"journal":{"name":"Conference Papers Power Industry Computer Application Conference","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132284311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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