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}
R. Aresi, B. Delfino, F. Fornari, S. Massucco, A. Morini
The paper describes the significant changes expected in power system operation and management required by the restructuring process of electric industry. The problem of automatic generation control (AGC) is addressed under the open trading perspective. The fundamental concepts of AGC are recalled and the possible modifications are presented. The co-existence of a primary service predominantly based on long-term bilateral contracts and of secondary services (or ancillary services) such as load-following and secondary frequency control is highlighted. Different AGC solutions are theoretically reported and supported by simulations on a CIGRE test system.
{"title":"Power system automatic generation control revised from the open trading perspective","authors":"R. Aresi, B. Delfino, F. Fornari, S. Massucco, A. Morini","doi":"10.1109/PTC.1999.826442","DOIUrl":"https://doi.org/10.1109/PTC.1999.826442","url":null,"abstract":"The paper describes the significant changes expected in power system operation and management required by the restructuring process of electric industry. The problem of automatic generation control (AGC) is addressed under the open trading perspective. The fundamental concepts of AGC are recalled and the possible modifications are presented. The co-existence of a primary service predominantly based on long-term bilateral contracts and of secondary services (or ancillary services) such as load-following and secondary frequency control is highlighted. Different AGC solutions are theoretically reported and supported by simulations on a CIGRE test system.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"50 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":"124403278","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 report some results of research of electric power quality (EPQ) in power system networks of Ukraine are considered. The approach to realization of measurements of electric power quality indices (EPQI) values as random variables, and evaluation of results of measurement are considered. Because of the analysis of a state of EPQ in power networks of some power system substations, a number of practical conclusions are made. They are expedient for use in realization of measurement with the purpose of work reduction and increase of measurement efficiencies.
{"title":"Measurement and analysis of electric power quality in power system networks","authors":"A. Lipsky","doi":"10.1109/PTC.1999.826652","DOIUrl":"https://doi.org/10.1109/PTC.1999.826652","url":null,"abstract":"In the report some results of research of electric power quality (EPQ) in power system networks of Ukraine are considered. The approach to realization of measurements of electric power quality indices (EPQI) values as random variables, and evaluation of results of measurement are considered. Because of the analysis of a state of EPQ in power networks of some power system substations, a number of practical conclusions are made. They are expedient for use in realization of measurement with the purpose of work reduction and increase of measurement efficiencies.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"64 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":"131757062","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 self-organizing map (SOM) based method for power system load-loss state classification. This classifier maps vectors of an N-dimensional space to a 2-dimensional net in a nonlinear way while preserving the topological order of the input vectors. Input features to SOM are real and reactive power at each load bus and available real power generation at each generation bus. After the training of the SOM, the generalization capability of the SOM can cope with various operating conditions which have not been encountered during the training phase and hence give a correct classification result. The effectiveness of the proposed method has been demonstrated on a 9-bus test system. This proposed method is useful for power system operation, power system reliability assessment and state screening.
{"title":"Using self-organizing map in identification of load-loss state","authors":"X. Luo, C. Singh, A. Patton","doi":"10.1109/PTC.1999.826563","DOIUrl":"https://doi.org/10.1109/PTC.1999.826563","url":null,"abstract":"This paper presents a self-organizing map (SOM) based method for power system load-loss state classification. This classifier maps vectors of an N-dimensional space to a 2-dimensional net in a nonlinear way while preserving the topological order of the input vectors. Input features to SOM are real and reactive power at each load bus and available real power generation at each generation bus. After the training of the SOM, the generalization capability of the SOM can cope with various operating conditions which have not been encountered during the training phase and hence give a correct classification result. The effectiveness of the proposed method has been demonstrated on a 9-bus test system. This proposed method is useful for power system operation, power system reliability assessment and state screening.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"42 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":"132585653","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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