This paper presents some new results on the geometry of the reactive load-flow problem. These results have implications in order to assess the system margin to the voltage collapse and to design a secondary voltage control aimed to avoid the voltage collapse. The results are based on certain mathematical and very general properties of the Jacobian matrices of the load-flow equations.
{"title":"On voltage stability regions and voltage secondary control","authors":"J. Barquín","doi":"10.1109/PTC.1999.826678","DOIUrl":"https://doi.org/10.1109/PTC.1999.826678","url":null,"abstract":"This paper presents some new results on the geometry of the reactive load-flow problem. These results have implications in order to assess the system margin to the voltage collapse and to design a secondary voltage control aimed to avoid the voltage collapse. The results are based on certain mathematical and very general properties of the Jacobian matrices of the load-flow equations.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"189 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126031297","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}
Lightning transients processes appear when lightning strikes hit tall objects, such as transmission and communication towers or transformer substations. Large currents generated by the stroke flow in the grounding system and dissipate in the soil. The electromagnetic fields (EMF) generated by such high currents may cause damage to equipment and may be dangerous to personnel. The field theory method is used to examine the transient behaviour of the lightning processes in the grounding system.
{"title":"Frequency domain analysis of 110/35 kV transformer station grounding system subject to lightning strike","authors":"S. Nikolovski, S. Fortin","doi":"10.1109/PTC.1999.826670","DOIUrl":"https://doi.org/10.1109/PTC.1999.826670","url":null,"abstract":"Lightning transients processes appear when lightning strikes hit tall objects, such as transmission and communication towers or transformer substations. Large currents generated by the stroke flow in the grounding system and dissipate in the soil. The electromagnetic fields (EMF) generated by such high currents may cause damage to equipment and may be dangerous to personnel. The field theory method is used to examine the transient behaviour of the lightning processes in the grounding system.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126976184","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}
This paper presents a new simulation method to analyze the transient stability of a power system including three phase unbalanced impedances. The method is based on the phase coordinate method, because it is easy to analyze the power system which has elements of unbalanced three phase impedances by the phase coordinate method. This paper consists of two main parts: unbalanced power flow calculation to determine the initial conditions, and the transient stability simulation of power system following faults.
{"title":"A method of transient stability simulation of unbalanced power system","authors":"J. Tamura, M. Kubo, T. Nagano","doi":"10.1109/PTC.1999.826664","DOIUrl":"https://doi.org/10.1109/PTC.1999.826664","url":null,"abstract":"This paper presents a new simulation method to analyze the transient stability of a power system including three phase unbalanced impedances. The method is based on the phase coordinate method, because it is easy to analyze the power system which has elements of unbalanced three phase impedances by the phase coordinate method. This paper consists of two main parts: unbalanced power flow calculation to determine the initial conditions, and the transient stability simulation of power system following faults.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125097449","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 paper presents an evaluation of the ATP-EMTP in power system protection. A simulation model of an actual power plant and substation were created and short circuits were simulated. The analysis of results is given and compared with actual results of the real measurements.
{"title":"Testing ATP-EMTP in power system protection","authors":"A. Marusic, J. Havelka, M. Delimar","doi":"10.1109/PTC.1999.826638","DOIUrl":"https://doi.org/10.1109/PTC.1999.826638","url":null,"abstract":"The paper presents an evaluation of the ATP-EMTP in power system protection. A simulation model of an actual power plant and substation were created and short circuits were simulated. The analysis of results is given and compared with actual results of the real measurements.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123614056","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 great bulk of data that characterises the EMS/DMS supervisor monitoring or control actions comports noteworthy system information management problems. It is important to adopt a new modelling philosophy that allows in a simple but efficient manner the system state representation within an open architecture environment. In this paper, the power system is represented through a distributed database, using the big object modelling (BOM) technique to model each of its components, that allows a quick and wide access to all system information.
{"title":"A power system Java-based distributed database design","authors":"D. Menniti, N. Sorrentino, B. Giorgi","doi":"10.1109/PTC.1999.826550","DOIUrl":"https://doi.org/10.1109/PTC.1999.826550","url":null,"abstract":"The great bulk of data that characterises the EMS/DMS supervisor monitoring or control actions comports noteworthy system information management problems. It is important to adopt a new modelling philosophy that allows in a simple but efficient manner the system state representation within an open architecture environment. In this paper, the power system is represented through a distributed database, using the big object modelling (BOM) technique to model each of its components, that allows a quick and wide access to all system information.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122481834","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}
In the paper, a new method of the generation distribution factors appropriate for transmission service pricing is presented. The new method is based on power flow directions and can be utilized for both, active and reactive powers. The method is exact, simple and easy since it does not involve operations on system matrices. The factors obtained by the new method are named nodal generation distribution factors (NGDF-s). The results show that the method can be successfully applied for pricing of the transmission service based on the MW-MILE methodology.
{"title":"New generation distribution factors for active and reactive powers transmission costing","authors":"D. Grgić, F. Gubina","doi":"10.1109/PTC.1999.826514","DOIUrl":"https://doi.org/10.1109/PTC.1999.826514","url":null,"abstract":"In the paper, a new method of the generation distribution factors appropriate for transmission service pricing is presented. The new method is based on power flow directions and can be utilized for both, active and reactive powers. The method is exact, simple and easy since it does not involve operations on system matrices. The factors obtained by the new method are named nodal generation distribution factors (NGDF-s). The results show that the method can be successfully applied for pricing of the transmission service based on the MW-MILE methodology.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121531163","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}
This article presents an emergency control system, the results of a series of the offline procedures, designed to act correctively in the case of transmission line outages. The corrective actions have to do with introducing various forms of active and reactive operating reserves (spinning reserve, ready reserve, VAr equipment and load shedding). The suggested methodology, applied through the mentioned procedures, results in information arrangeable in tables and/or a chart of introducing particular segments of the operating reserve, together with the already scheduled generators, selecting the one suited best for the actual level and distribution of the system's load.
{"title":"On optimal space distribution of ready-reserve in a power system-comprehensive approach","authors":"S.S. Halilcevic, F. Gubina","doi":"10.1109/PTC.1999.826454","DOIUrl":"https://doi.org/10.1109/PTC.1999.826454","url":null,"abstract":"This article presents an emergency control system, the results of a series of the offline procedures, designed to act correctively in the case of transmission line outages. The corrective actions have to do with introducing various forms of active and reactive operating reserves (spinning reserve, ready reserve, VAr equipment and load shedding). The suggested methodology, applied through the mentioned procedures, results in information arrangeable in tables and/or a chart of introducing particular segments of the operating reserve, together with the already scheduled generators, selecting the one suited best for the actual level and distribution of the system's load.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124983301","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}
This work reviews the latest works on load forecasting, classifying them according to presented methods and models, as statistical, intelligent systems, neural networks and fuzzy logic. As there are many different models and methods, we have studied the principal ones considering classical statistical and modern methods like neural networks and fuzzy logic. We emphasize the importance of load forecasting in modern operation centers, and conclude that nowadays the most used forecasting methods are the neural networks and fuzzy logic, but the statistical ones continue being used although to a lesser extent.
{"title":"Electric power systems load forecasting: a survey","authors":"A. Lotufo, C. R. Minussi","doi":"10.1109/PTC.1999.826467","DOIUrl":"https://doi.org/10.1109/PTC.1999.826467","url":null,"abstract":"This work reviews the latest works on load forecasting, classifying them according to presented methods and models, as statistical, intelligent systems, neural networks and fuzzy logic. As there are many different models and methods, we have studied the principal ones considering classical statistical and modern methods like neural networks and fuzzy logic. We emphasize the importance of load forecasting in modern operation centers, and conclude that nowadays the most used forecasting methods are the neural networks and fuzzy logic, but the statistical ones continue being used although to a lesser extent.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125055669","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}
This paper presents a heuristic reconfiguration algorithm developed for implementation in a very flexible meshed network with remote controlled switches for real-time operating mode. The purpose is that of on-line minimisation of network operation costs over a time period, mainly through minimisation of power losses and the number of switching operations, preserving at the same time load balancing. The algorithm's ability to perform an efficient optimal reconfiguration in normal operating condition has been tested in reference to a different degree of complexity of the meshed network which it is applied to.
{"title":"Electrical distribution system reconfiguration for future meshed networks","authors":"A. Cali, F. Caudullo, S. Conti, G. Marco Tina","doi":"10.1109/PTC.1999.826496","DOIUrl":"https://doi.org/10.1109/PTC.1999.826496","url":null,"abstract":"This paper presents a heuristic reconfiguration algorithm developed for implementation in a very flexible meshed network with remote controlled switches for real-time operating mode. The purpose is that of on-line minimisation of network operation costs over a time period, mainly through minimisation of power losses and the number of switching operations, preserving at the same time load balancing. The algorithm's ability to perform an efficient optimal reconfiguration in normal operating condition has been tested in reference to a different degree of complexity of the meshed network which it is applied to.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131543702","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. Augugliaro, V. Cataliotti, L. Dusonchet, S. Favuzza, G. Scaccianoce
In recent years, interest in the application of soft computing techniques to electrical power systems has rapidly grown; in particular the application of artificial neural networks (ANN) and genetic algorithms (GA) in the solution of load-flow problem in wide electrical power systems, as valid alternative to the classical numerical algorithms, is an interesting research topic. In the present paper, a refined solution strategy based on statistical methods, on a particular the grouping genetic algorithm (GGA) and on progressive learning networks (PLN) is presented to solve load-flow problems in electrical power systems taking also into account configuration changes; in particular, a procedure to solve the system when a link is removed, or added, is described and implemented. Test results on the standard IEEE 118 bus network have demonstrated the good potential and efficiency of the procedure.
{"title":"Load flow solution in electrical power systems with variable configurations by progressive learning networks","authors":"A. Augugliaro, V. Cataliotti, L. Dusonchet, S. Favuzza, G. Scaccianoce","doi":"10.1109/PTC.1999.826562","DOIUrl":"https://doi.org/10.1109/PTC.1999.826562","url":null,"abstract":"In recent years, interest in the application of soft computing techniques to electrical power systems has rapidly grown; in particular the application of artificial neural networks (ANN) and genetic algorithms (GA) in the solution of load-flow problem in wide electrical power systems, as valid alternative to the classical numerical algorithms, is an interesting research topic. In the present paper, a refined solution strategy based on statistical methods, on a particular the grouping genetic algorithm (GGA) and on progressive learning networks (PLN) is presented to solve load-flow problems in electrical power systems taking also into account configuration changes; in particular, a procedure to solve the system when a link is removed, or added, is described and implemented. Test results on the standard IEEE 118 bus network have demonstrated the good potential and efficiency of the procedure.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"1036 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131562897","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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