P.A. Teixeira, S. R. Brammer, W.L. Rutz, W. C. Merritt, J.L. Salmonsen
{"title":"State estimation of voltage and phase-shift transformer tap settings","authors":"P.A. Teixeira, S. R. Brammer, W.L. Rutz, W. C. Merritt, J.L. Salmonsen","doi":"10.1109/PICA.1991.160611","DOIUrl":"https://doi.org/10.1109/PICA.1991.160611","url":null,"abstract":"Traditionally, state estimation algorithms have treated each transformer tap setting (voltage transformer turns ratio or phase-shift transformer angle) as a fixed parameter of the network, even though the real-time measurement may be in error or nonexistent. Such a strategy can lead to misdirecting residuals in adjacent valid measurements when the modeled transformer setting is incorrect. Ultimately, a network solution is derived which does not match actual real-time conditions. A new transformer tap estimation technique is presented which incorporates the function directly into the state estimation algorithm. The procedure provides for turns ratio and phase angle measurements and treats each transformer tap setting as an independent state variable. Test results for an actual 300-bus network demonstrate the tap estimation capability.<<ETX>>","PeriodicalId":287152,"journal":{"name":"[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference","volume":"10 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121009693","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}
{"title":"Representing the production cost curve of a power system using the method of moments","authors":"J. Bloom","doi":"10.1109/PICA.1991.160659","DOIUrl":"https://doi.org/10.1109/PICA.1991.160659","url":null,"abstract":"An analytic formula, based upon the equivalent load method, for computing the production cost of a power system is presented. This formula can serve as a complement to larger, more complex production cost models since it requires significantly less data and computational effort when running many variants of a basic system configuration. The formula consists of several terms of a Gram-Charlier series using moments which are computed in one iteration of the usual probabilistic production cost algorithm. This formula is particularly suitable for use in iterative optimization models for generation planning, since its parameters can be recomputed easily to account for changes due to construction of new plants. It also permits simple calculation of the gradient of production cost with respect to the capacities of the candidate units. The formula also is useful in calculating the changes in production cost due to load shape changes associated with demand-side management.<<ETX>>","PeriodicalId":287152,"journal":{"name":"[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference","volume":"33 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":"121984803","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}
M. Kunugi, M. Yohda, S. Tamura, H. Watanabe, T. Hasegawa
{"title":"Performance validation of a functionally distributed energy management architecture","authors":"M. Kunugi, M. Yohda, S. Tamura, H. Watanabe, T. Hasegawa","doi":"10.1109/PICA.1991.160629","DOIUrl":"https://doi.org/10.1109/PICA.1991.160629","url":null,"abstract":"A functionally distributed computer system is proposed for an energy management system (EMS) and a large-scale SCADA system that features parallel processing and independence of subsystems in order to overcome the limitations of overly large and complex systems. Such a system would increase performance, flexibility of expansion, improve reliability and reduce costs. The performance feasibility of this architecture was confirmed by computer simulation and construction of a prototype system. System software for a functionally distributed EMS/SCADA system was developed.<<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":"122121167","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}
{"title":"Efficient methods for finding transfer function zeros of power systems","authors":"N. Martins, H. Pinto, L. Lima","doi":"10.1109/PICA.1991.160595","DOIUrl":"https://doi.org/10.1109/PICA.1991.160595","url":null,"abstract":"Algorithms suited to the efficient calculation of both proper and nonproper transfer function zeros of linearized dynamic models for large interconnected power systems are described. An improvement to the well known AESOPS algorithm is described, formulating it as an exact transfer function zero finding problem which is efficiently solved by a Newton-Raphson iterative scheme. Large power system results are presented.<<ETX>>","PeriodicalId":287152,"journal":{"name":"[Proceedings] Conference Papers 1991 Power Industry Computer Application Conference","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131882936","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}