This paper presents a conception of a multicriterial adaptive load shedding algorithm that is assigned to thermal power units when the island work conditions connected with the dynamic growing energy shortfall occurs. The main purpose of the multicriterial adaptive load shedding algorithm is determination of the real unbalance of the electric power estimation inside the separated subsystem electric network after disturbance, and formulation the command signals for tripping-out respective loads. This adaptive load shedding algorithm is based on an analysis in an every time interval /spl Delta/t after disturbance of the rate of change of frequency. Determination of the actual value of loads that have to be shut-down is based on the both an actual value of frequency, rate of change of frequency and the actual separated subsystem structure.
{"title":"Multicriterial adaptive load shedding algorithm","authors":"G. Sodzawiczny, P. Sowa","doi":"10.1109/PTC.1999.826624","DOIUrl":"https://doi.org/10.1109/PTC.1999.826624","url":null,"abstract":"This paper presents a conception of a multicriterial adaptive load shedding algorithm that is assigned to thermal power units when the island work conditions connected with the dynamic growing energy shortfall occurs. The main purpose of the multicriterial adaptive load shedding algorithm is determination of the real unbalance of the electric power estimation inside the separated subsystem electric network after disturbance, and formulation the command signals for tripping-out respective loads. This adaptive load shedding algorithm is based on an analysis in an every time interval /spl Delta/t after disturbance of the rate of change of frequency. Determination of the actual value of loads that have to be shut-down is based on the both an actual value of frequency, rate of change of frequency and the actual separated subsystem structure.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"58 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":"122504899","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}
Summary form only given. In this paper, a general multi-level structure is introduced which allows posing various objectives of power industry operations and planning in terms of specific industry structures and measurement of the suboptimality of the particular implementation relative to the benchmark performance achievable only under full certainty and coordination. This, furthermore, makes it possible to identify major unsolved industry problems and their criticality, as well as some new research problems created by the industry changes.
{"title":"General structure of the regulated, deregulated and other generation dispatch systems","authors":"J. Zaborszky, M. Ilić","doi":"10.1109/PTC.1999.826433","DOIUrl":"https://doi.org/10.1109/PTC.1999.826433","url":null,"abstract":"Summary form only given. In this paper, a general multi-level structure is introduced which allows posing various objectives of power industry operations and planning in terms of specific industry structures and measurement of the suboptimality of the particular implementation relative to the benchmark performance achievable only under full certainty and coordination. This, furthermore, makes it possible to identify major unsolved industry problems and their criticality, as well as some new research problems created by the industry changes.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"59 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":"122888448","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 sensitivity analysis based security constrained optimal power flow (SCOPF) for solving the green field VAr allocation problem. Sensitivity analysis is used to quantify the impact of an incremental change in reactive pattern and various controls on the voltage profiles for a number of power system states. An efficient method for computing all relevant sensitivities is developed for that purpose and incorporated within the LP based SCOPF. The proposed scheme is implemented to optimally allocate reactive power reserves among system generators. Results of the case studies carried out on the IEEE-30 bus system demonstrate the validity of the developed sensitivity analysis based SCOPF method.
{"title":"A sensitivity analysis based security constrained optimal power flow for allocation of reactive capability in a competitive environment","authors":"L. Yao, G. Strbac","doi":"10.1109/PTC.1999.826492","DOIUrl":"https://doi.org/10.1109/PTC.1999.826492","url":null,"abstract":"This paper presents a sensitivity analysis based security constrained optimal power flow (SCOPF) for solving the green field VAr allocation problem. Sensitivity analysis is used to quantify the impact of an incremental change in reactive pattern and various controls on the voltage profiles for a number of power system states. An efficient method for computing all relevant sensitivities is developed for that purpose and incorporated within the LP based SCOPF. The proposed scheme is implemented to optimally allocate reactive power reserves among system generators. Results of the case studies carried out on the IEEE-30 bus system demonstrate the validity of the developed sensitivity analysis based SCOPF method.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"1 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":"131184525","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 artificial neural networks are applied to medium term electric load forecasting for the Hungarian Electric Power System. A feedforward multi-layer network with one hidden layer was applied using the error backpropagation algorithm for the estimation of the model weights. A model description and detailed prediction error analysis are presented.
{"title":"Medium term electric load forecasting using artificial neural networks","authors":"L. Varga","doi":"10.1109/PTC.1999.826468","DOIUrl":"https://doi.org/10.1109/PTC.1999.826468","url":null,"abstract":"In the paper artificial neural networks are applied to medium term electric load forecasting for the Hungarian Electric Power System. A feedforward multi-layer network with one hidden layer was applied using the error backpropagation algorithm for the estimation of the model weights. A model description and detailed prediction error analysis are presented.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"1 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":"131201424","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 this paper, a new technique, based on genetic algorithms, for the optimal sizing and siting of distributed generation resources in MV distribution networks is presented. Tests on two networks of 43 and 93 buses are also provided to show the efficiency of the proposed technique.
{"title":"Distributed generation planning using genetic algorithms","authors":"A. Silvestri, A. Berizzi, S. Buonanno","doi":"10.1109/PTC.1999.826689","DOIUrl":"https://doi.org/10.1109/PTC.1999.826689","url":null,"abstract":"In this paper, a new technique, based on genetic algorithms, for the optimal sizing and siting of distributed generation resources in MV distribution networks is presented. Tests on two networks of 43 and 93 buses are also provided to show the efficiency of the proposed technique.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"116 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":"132925752","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}
Users working in different departments in electric power companies need access to SCADA data. The problem is how to provide low cost and secure access to SCADA data from various locations in the company. An intranet and SCADA system interconnection based on industry-accepted communication standards is hereby presented as a solution. Through a link to SCADA data acquisition and control server, the Web server from the intranet brings SCADA real-time and historical information to users via a single front end, the familiar Web browser. The presented solution provides an information layer that is independent of the operating system, lowers hardware, software and administrative costs while improving reliability and security.
{"title":"Company intranet access to SCADA information","authors":"G. Zecevic, Z. Jovanovic","doi":"10.1109/PTC.1999.826552","DOIUrl":"https://doi.org/10.1109/PTC.1999.826552","url":null,"abstract":"Users working in different departments in electric power companies need access to SCADA data. The problem is how to provide low cost and secure access to SCADA data from various locations in the company. An intranet and SCADA system interconnection based on industry-accepted communication standards is hereby presented as a solution. Through a link to SCADA data acquisition and control server, the Web server from the intranet brings SCADA real-time and historical information to users via a single front end, the familiar Web browser. The presented solution provides an information layer that is independent of the operating system, lowers hardware, software and administrative costs while improving reliability and security.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"76 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":"134122915","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 model to represent medium-term hydro operation in a deregulated power market. The objective of the model is to maximise the profit for a firm. The system is represented in two different levels: weekly and yearly. The weekly module computes profit as a function of total hydro production of the firm in each week. The yearly module uses this function to obtain the optimal operation that maximises profit.
{"title":"Medium-term hydro operation in a competitive electricity market","authors":"J. Barquín, E. Centeno, E. Malillos","doi":"10.1109/PTC.1999.826477","DOIUrl":"https://doi.org/10.1109/PTC.1999.826477","url":null,"abstract":"This paper presents a model to represent medium-term hydro operation in a deregulated power market. The objective of the model is to maximise the profit for a firm. The system is represented in two different levels: weekly and yearly. The weekly module computes profit as a function of total hydro production of the firm in each week. The yearly module uses this function to obtain the optimal operation that maximises profit.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"84 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":"133878997","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 efficient control of power systems requires the up-to-date industrial supervisory control and data acquisition (SCADA) standards and the latest artificial intelligence (AI) functions as well. The paper introduces the automatic event- and alarm recogniser and switching sequence generator functions and their embedding procedures into an existing SCADA system.
{"title":"Extension of the standard SCADA functionality with AI tools","authors":"P. Kadar, K. Attila, M. Andras, S. Ervin","doi":"10.1109/PTC.1999.826458","DOIUrl":"https://doi.org/10.1109/PTC.1999.826458","url":null,"abstract":"The efficient control of power systems requires the up-to-date industrial supervisory control and data acquisition (SCADA) standards and the latest artificial intelligence (AI) functions as well. The paper introduces the automatic event- and alarm recogniser and switching sequence generator functions and their embedding procedures into an existing SCADA system.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"2012 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":"114505886","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 ageing of oil immersed cellulose insulation material mainly depends on its thermal load. Up to now cellulose insulation is used in most of the power transformers. In order to give special attention to the thermal behavior of oil immersed power transformers, a monitoring system was developed. The system measures the load, typical temperatures of the transformer and its cooling units, the tap changer position and the state of fans and pumps of all cooling units. In addition the output signal of a gas-in-oil sensor is evaluated. The hardware setup and the thermal monitoring algorithms used in the system are described. In order to determine the winding temperature distribution with improved accuracy a thermal model has been designed and integrated in the monitoring system.
{"title":"Thermal monitoring of large power transformers","authors":"M. Schafer, K. Feser","doi":"10.1109/PTC.1999.826529","DOIUrl":"https://doi.org/10.1109/PTC.1999.826529","url":null,"abstract":"The ageing of oil immersed cellulose insulation material mainly depends on its thermal load. Up to now cellulose insulation is used in most of the power transformers. In order to give special attention to the thermal behavior of oil immersed power transformers, a monitoring system was developed. The system measures the load, typical temperatures of the transformer and its cooling units, the tap changer position and the state of fans and pumps of all cooling units. In addition the output signal of a gas-in-oil sensor is evaluated. The hardware setup and the thermal monitoring algorithms used in the system are described. In order to determine the winding temperature distribution with improved accuracy a thermal model has been designed and integrated in the monitoring system.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"40 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":"114826717","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}
To keep the high availability of long EHV transmission lines at reduced phase-to-phase and phase-to-ground distances requires improving the successfulness of automatic reclosing. The authors propose a scheme offering a simple and efficient protection to limit the re-energization overvoltages at a low level and helping the place of the fault to recover.
{"title":"Use of neutral reactors for improving the successfulness of three phase reclosing","authors":"G. Bán, L. Prikler, A. Said","doi":"10.1109/PTC.1999.826573","DOIUrl":"https://doi.org/10.1109/PTC.1999.826573","url":null,"abstract":"To keep the high availability of long EHV transmission lines at reduced phase-to-phase and phase-to-ground distances requires improving the successfulness of automatic reclosing. The authors propose a scheme offering a simple and efficient protection to limit the re-energization overvoltages at a low level and helping the place of the fault to recover.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"1 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":"116709587","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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