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[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference最新文献

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Estimate of power-frequency characteristics in power systems by using normal operating data 利用正常运行数据估计电力系统工频特性
[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference Pub Date : 1991-05-07 DOI: 10.1109/PICA.1991.160610
S. Hayashi, A. Kawata, H. Nomura
{"title":"Estimate of power-frequency characteristics in power systems by using normal operating data","authors":"S. Hayashi, A. Kawata, H. Nomura","doi":"10.1109/PICA.1991.160610","DOIUrl":"https://doi.org/10.1109/PICA.1991.160610","url":null,"abstract":"It is demonstrated that normal operating data in power systems may be used to determine power-frequency characteristics. Both generator and load power-frequency characteristics are estimated as transfer functions, using spectral analysis techniques. Generator characteristics can be determined as a transfer function of a two-input-single-output linear system. Although there is some difficulty in estimating load characteristics, it is shown that the estimate is given as a transfer function of the system with output measurement noise. The results of a simulation study indicate that the methods described are effective for estimating power-frequency characteristics.<<ETX>>","PeriodicalId":287152,"journal":{"name":"[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116195542","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}
引用次数: 3
Parallel implementation of a power system dynamic simulation methodology using the conjugate gradient method 用共轭梯度法并行实现电力系统动态仿真方法
[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference Pub Date : 1991-05-07 DOI: 10.1109/PICA.1991.160616
I. C. Decker, D. Falcão, E. Kaszkurewicz
{"title":"Parallel implementation of a power system dynamic simulation methodology using the conjugate gradient method","authors":"I. C. Decker, D. Falcão, E. Kaszkurewicz","doi":"10.1109/PICA.1991.160616","DOIUrl":"https://doi.org/10.1109/PICA.1991.160616","url":null,"abstract":"Results of tests with a parallel implementation of a power system dynamic simulation methodology for transient stability analysis in a parallel computer are presented. The test system is a planned configuration of the interconnected Brazilian South-Southeastern power system with 616 buses, 995 lines, and 88 generators. The parallel machine used in the computer simulation is a distributed memory multiprocessor arranged in a hypercube topology architecture. The nodes are based on the Inmos T800 processor with 4 MBytes of local memory. The simulation methodology is based on the interlaced alternating implicit integration scheme in which the network equations are reordered such that the network admittance matrix appears in the block bordered diagonal form and then is solved by a combined application of the LU factorization and the conjugate gradient method. The results obtained show considerable reductions in the simulation time.<<ETX>>","PeriodicalId":287152,"journal":{"name":"[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130423907","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}
引用次数: 59
Combined use of unsupervised and supervised learning for dynamic security assessment 结合使用无监督和监督学习进行动态安全评估
[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference Pub Date : 1991-05-07 DOI: 10.1109/PICA.1991.160589
Y. Pao, D. Sobajic
{"title":"Combined use of unsupervised and supervised learning for dynamic security assessment","authors":"Y. Pao, D. Sobajic","doi":"10.1109/PICA.1991.160589","DOIUrl":"https://doi.org/10.1109/PICA.1991.160589","url":null,"abstract":"It is highly desirable that the security and stability of electric power systems after exposure to large disturbances be assessable. In this connection, the critical clearing time (CCT) is an attribute which provides significant information about the quality of the post-fault system behavior. It may be regarded as a complex mapping of the prefault, fault-on, and post-fault system conditions in the time domain. Y.-H. Pao and D.J. Solajic (1989) showed that a feedforward neural network can be used to learn this mapping and successfully perform under variable system operating conditions and topologies. In that work the system was described in terms of some conventionally used parameters. In contrast to using those pragmatic features selected on the basis of the engineering understanding of the problem, the possibility of using unsupervised and supervised learning paradigms to discover what combination of raw measurements are significant in determining CCT is considered. Correlation analysis and Euclidean metric are used to specify interfeature dependencies. An example of a 4-machine power system is used to illustrate the suggested approach.<<ETX>>","PeriodicalId":287152,"journal":{"name":"[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131269165","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}
引用次数: 135
Real-time data exchange for on-line security assessment 实时数据交换用于在线安全评估
[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference Pub Date : 1991-05-07 DOI: 10.1109/PICA.1991.160649
K. Kato, I. Dabbaghchi, J. Allemong, J. Robinson, J. Singh, R.A. Smith
{"title":"Real-time data exchange for on-line security assessment","authors":"K. Kato, I. Dabbaghchi, J. Allemong, J. Robinson, J. Singh, R.A. Smith","doi":"10.1109/PICA.1991.160649","DOIUrl":"https://doi.org/10.1109/PICA.1991.160649","url":null,"abstract":"The current status and near-term future goals of real-time data exchange for online security assessment in several regions of the US are described from the viewpoint of the end-user application, namely, security assessment. An overview of the issues concerning data exchange for external network modeling is presented. Several data exchange systems are discussed. The following information is provided: description, justification of data exchange, uses for the data, types and quantities of the data exchanged, frequency of data exchange, impact of data exchange on the system modeling detail, feasibility of implementing online security assessment without data exchange, exchange of supporting static data, effort to establish and maintain data exchange, and problems/solutions.<<ETX>>","PeriodicalId":287152,"journal":{"name":"[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115548949","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}
引用次数: 15
Distribution system short circuit analysis-a rigid approach 配电系统短路分析——一种刚性方法
[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference Pub Date : 1991-05-07 DOI: 10.1109/PICA.1991.160647
T. Chen, M. Chen, W. Lee, P. Kotas, P. Van Olinda
{"title":"Distribution system short circuit analysis-a rigid approach","authors":"T. Chen, M. Chen, W. Lee, P. Kotas, P. Van Olinda","doi":"10.1109/PICA.1991.160647","DOIUrl":"https://doi.org/10.1109/PICA.1991.160647","url":null,"abstract":"A rigid approach to short circuit analysis for large-scale distribution systems is introduced. The approach uses an individual (a-b-c) phase-based system representation, a nontrivial transformer model, and includes the contribution due to load. The method can, therefore, be applied to balanced or unbalanced, radial, network, or mixed-type distribution systems. This approach is oriented toward applications in distribution system operation analysis rather than the more typical planning-oriented analysis. The solution method is an iterative compensation method, which uses a single optimally ordered factorization of the bus admittance matrix (Y/sub Bus/), commonly used in power flow analysis, to simulate the fault condition. The use of this method in a short circuit analysis program enables a factorized Y/sub Bus/ solution, resulting in many advantages. Using a common factorization, both power flow and short circuit analyses are possible in a single execution. Since the factorization is unchanged, multiple faults of various types can be simulated in one run of the program.<<ETX>>","PeriodicalId":287152,"journal":{"name":"[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123997605","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}
引用次数: 74
Operational experience and maintenance of an on-line expert system for customer restoration and fault testing 为客户修复和故障测试提供在线专家系统的操作和维护经验
[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference Pub Date : 1991-05-07 DOI: 10.1109/PICA.1991.160600
T. Ma, C. Liu, M. Tsai, R. Rogers, S. L. Muchlinski, J. Dodge
{"title":"Operational experience and maintenance of an on-line expert system for customer restoration and fault testing","authors":"T. Ma, C. Liu, M. Tsai, R. Rogers, S. L. Muchlinski, J. Dodge","doi":"10.1109/PICA.1991.160600","DOIUrl":"https://doi.org/10.1109/PICA.1991.160600","url":null,"abstract":"CRAFT (customer restoration and fault testing) is a rule-based expert system capable of locating the faulted section of a power transmission line based on the status of circuit breakers an automatic switches. CRAFT has been operating online in the Puget Sound Power and Light control center since July 1988. The online operational experience is reported. Many of the developed expert systems will be maintained or modified by utility engineers. This study proposes a methodology for maintaining rule-based expert systems. The following capabilities are incorporated: detecting the relations of conflict, redundancy, etc., to maintain consistency of the rule base, tracing the reasoning process to understand the problem solving approach, and reducing the size of test cases after changes are made to the rules. The proposed method has been implemented for CRAFT.<<ETX>>","PeriodicalId":287152,"journal":{"name":"[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116212352","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}
引用次数: 58
More accurate modeling of gas insulated substation components in digital simulations of very fast electromagnetic transients 快速电磁瞬变数字仿真中气体绝缘变电站元件的更精确建模
[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference Pub Date : 1991-05-07 DOI: 10.1109/PICA.1991.160586
Z. Haznadar, S. Carsimamovic, R. Mahmutčehajić
{"title":"More accurate modeling of gas insulated substation components in digital simulations of very fast electromagnetic transients","authors":"Z. Haznadar, S. Carsimamovic, R. Mahmutčehajić","doi":"10.1109/PICA.1991.160586","DOIUrl":"https://doi.org/10.1109/PICA.1991.160586","url":null,"abstract":"Very fast electromagnetic transients caused by switching operations in gas-insulated substations (GIS) cannot be calculated if conventional techniques of modeling and simulations are used. The choice and adjustments of the most suitable models as well as determinations of their limitations in the digital simulation of very fast transients in GIS are investigated. Results obtained from very extensive field tests as well as from digital simulations for different types of GIS have been used for the development of more accurate models for GIS components and GIS as a whole. A comparison between field test and calculation results enables the development of a model which takes into account the most decisive physical phenomena inherent in the very fast transients in the GIS. This is a prerequisite for designing and manufacturing power system components as well as for control and protection of the system.<<ETX>>","PeriodicalId":287152,"journal":{"name":"[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124728383","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}
引用次数: 42
Power system static security assessment using the Kohonen neural network classifier 基于Kohonen神经网络分类器的电力系统静态安全评估
[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference Pub Date : 1991-05-07 DOI: 10.1109/PICA.1991.160588
D. Niebur, A. Germond
{"title":"Power system static security assessment using the Kohonen neural network classifier","authors":"D. Niebur, A. Germond","doi":"10.1109/PICA.1991.160588","DOIUrl":"https://doi.org/10.1109/PICA.1991.160588","url":null,"abstract":"The operating point of a power system can be defined as a vector whose components are active and reactive power measurements. If the security criterion is prevention of line overloads, the boundaries of the secure domain of the state space are given by the maximal admissible currents of the transmission lines. The application of an artificial neural network, Kohonen's self-organizing feature map, for the classification of power system states is presented. This classifier maps vectors of an N-dimensional space to a 2-dimensional neural net in a nonlinear way, preserving the topological order of the input vectors. Therefore, secure operating points, that is, vectors inside the boundaries of the secure domain, are mapped to a different region of the neural map than insecure operating points. These mappings are studied using a nonlinear power system model. Choice of security criteria and state space are discussed.<<ETX>>","PeriodicalId":287152,"journal":{"name":"[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131136512","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}
引用次数: 129
Performance simulation of distributed energy management systems 分布式能源管理系统的性能仿真
[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference Pub Date : 1991-05-07 DOI: 10.1109/PICA.1991.160630
K. Kato, H. Fudeh
{"title":"Performance simulation of distributed energy management systems","authors":"K. Kato, H. Fudeh","doi":"10.1109/PICA.1991.160630","DOIUrl":"https://doi.org/10.1109/PICA.1991.160630","url":null,"abstract":"The performance simulation of an open architecture energy management system (EMS) can provide detailed quantitative performance information long before a system is built. A method for simulating the performance of LAN-based EMSs is presented. The simulation shows how the performance of the system with respect to throughput and response time can be predicted. The results of the simulation of a generic LAN-based EMS for a typical operating scenario in a control center are presented. The simulation models the system hardware, including processor workstations, dispatcher consoles, memories, disks, LANs, file servers, etc. The LAN protocol and LAN data traffic are simulated. Typical EMS software functions are simulated. Dispatcher actions are simulated by random time event generators, which also simulate random power system events. Sensitivity analysis is performed by varying a number of system parameters to determine their effect on the simulated system. Outputs of the simulation show: utilization of the processors, consoles, LANs, and servers; LAN statistics; response times of display callups and supervisory control; and elapsed times of key EMS functions.<<ETX>>","PeriodicalId":287152,"journal":{"name":"[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference","volume":"151 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122133864","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}
引用次数: 29
A dynamic partitioning scheme for parallel transient stability analysis 一种并行暂态稳定分析的动态分划方案
[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference Pub Date : 1991-05-07 DOI: 10.1109/PICA.1991.160615
N. Zhu, A. Bose
{"title":"A dynamic partitioning scheme for parallel transient stability analysis","authors":"N. Zhu, A. Bose","doi":"10.1109/PICA.1991.160615","DOIUrl":"https://doi.org/10.1109/PICA.1991.160615","url":null,"abstract":"A dynamic partitioning scheme for a large power system is used to speed up the transient stability solution by utilizing different step sizes for the different portions. The partitioning and the different step sizes naturally lend themselves to a parallel implementation. Results are obtained by utilizing the successive overrelaxation (SOR) Newton parallel algorithm on the Alliant FX/8, an eight-processor parallel computer. For a 662 bus system, a total speedup, by partitioning and parallelizing, of 33.5 is obtained. Since parallelization by itself with 8 processors can produce a speedup of about 7, the partitioning scheme provides a speedup factor of about 5. The partitioning scheme is not specific to either the SOR Newton algorithm or the Alliant machine, and its application to any other parallel method should result in a similar speedup.<<ETX>>","PeriodicalId":287152,"journal":{"name":"[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128053914","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}
引用次数: 20
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