Pub Date : 2005-12-19DOI: 10.1109/NAPS.2005.1560547
R. Bhat, C. A. Gross
The authors present an analysis of voltage instability in electric power systems. A methodology for estimating proximity to voltage collapse is presented. The method is demonstrated by application to a six bus example.
{"title":"An analysis of voltage collapse in electric power systems","authors":"R. Bhat, C. A. Gross","doi":"10.1109/NAPS.2005.1560547","DOIUrl":"https://doi.org/10.1109/NAPS.2005.1560547","url":null,"abstract":"The authors present an analysis of voltage instability in electric power systems. A methodology for estimating proximity to voltage collapse is presented. The method is demonstrated by application to a six bus example.","PeriodicalId":101495,"journal":{"name":"Proceedings of the 37th Annual North American Power Symposium, 2005.","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129558935","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}
Pub Date : 2005-12-19DOI: 10.1109/NAPS.2005.1560543
M. Bandyopadhyay
This paper deals with the practical importance of the transformer diagnostic in the electrical engineering field. A review has been made on the modern development of this practical technology. Some empirical relation has been established by utilizing several practical data of the different transformers.
{"title":"A review on transformer diagnostics","authors":"M. Bandyopadhyay","doi":"10.1109/NAPS.2005.1560543","DOIUrl":"https://doi.org/10.1109/NAPS.2005.1560543","url":null,"abstract":"This paper deals with the practical importance of the transformer diagnostic in the electrical engineering field. A review has been made on the modern development of this practical technology. Some empirical relation has been established by utilizing several practical data of the different transformers.","PeriodicalId":101495,"journal":{"name":"Proceedings of the 37th Annual North American Power Symposium, 2005.","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130650474","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}
Pub Date : 2005-12-19DOI: 10.1109/NAPS.2005.1560505
Austin Armbruster, Michael Gosnell, Bruce McMillin, Mariesa L. Crow
The bulk power system is one of the largest man-made networks and its size makes control an extremely difficult task. This paper presents a method to control a power network using UPFCs set to levels determined by a maximum flow (max-flow) algorithm. The graph-theory-based max-flow is applied to the power system for UPFC placement and scheduling. A distributed version of max-flow is described to coordinate the actions of the UPFCs distributed in a power network. Two sample power systems were tested using max-flow for UPFC placement and settings. The resulting system characteristics are examined over all single-line contingencies and the appropriateness of the maximum flow algorithm for power flow control is discussed.
{"title":"The maximum flow algorithm applied to the placement and distributed steady-state control of UPFCs","authors":"Austin Armbruster, Michael Gosnell, Bruce McMillin, Mariesa L. Crow","doi":"10.1109/NAPS.2005.1560505","DOIUrl":"https://doi.org/10.1109/NAPS.2005.1560505","url":null,"abstract":"The bulk power system is one of the largest man-made networks and its size makes control an extremely difficult task. This paper presents a method to control a power network using UPFCs set to levels determined by a maximum flow (max-flow) algorithm. The graph-theory-based max-flow is applied to the power system for UPFC placement and scheduling. A distributed version of max-flow is described to coordinate the actions of the UPFCs distributed in a power network. Two sample power systems were tested using max-flow for UPFC placement and settings. The resulting system characteristics are examined over all single-line contingencies and the appropriateness of the maximum flow algorithm for power flow control is discussed.","PeriodicalId":101495,"journal":{"name":"Proceedings of the 37th Annual North American Power Symposium, 2005.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130761818","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}
Pub Date : 2005-12-19DOI: 10.1109/NAPS.2005.1560582
M. Milǒsević, G. Andersson
Recently, interest in isolated small power systems is rapidly increasing. This interest is due to the fact that larger power plants are economically unfeasible in many regions due to increasing system and fuel costs. When the system operates in isolation then load tracking problem arises which can cause voltage and frequency problems. One possible solution to keep power balance in the system and to have generation control is to use DC battery storage. This paper present a study of the generation control in small isolated power network based on grid voltage control and the storage frequency control.
{"title":"Generation control in small isolated power systems","authors":"M. Milǒsević, G. Andersson","doi":"10.1109/NAPS.2005.1560582","DOIUrl":"https://doi.org/10.1109/NAPS.2005.1560582","url":null,"abstract":"Recently, interest in isolated small power systems is rapidly increasing. This interest is due to the fact that larger power plants are economically unfeasible in many regions due to increasing system and fuel costs. When the system operates in isolation then load tracking problem arises which can cause voltage and frequency problems. One possible solution to keep power balance in the system and to have generation control is to use DC battery storage. This paper present a study of the generation control in small isolated power network based on grid voltage control and the storage frequency control.","PeriodicalId":101495,"journal":{"name":"Proceedings of the 37th Annual North American Power Symposium, 2005.","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122666210","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}
Pub Date : 2005-12-19DOI: 10.1109/NAPS.2005.1560592
D.R. Sagi, S. Ranade, A. Ellis
This paper explores a method for load composition estimation using fuzzy regression. The method is examined using synthetic data to test the accuracy and robustness. The results obtained show that aggregate load composition can be estimated with acceptable accuracy using assumed load component parameters.
{"title":"Evaluation of a load composition estimation method using synthetic data","authors":"D.R. Sagi, S. Ranade, A. Ellis","doi":"10.1109/NAPS.2005.1560592","DOIUrl":"https://doi.org/10.1109/NAPS.2005.1560592","url":null,"abstract":"This paper explores a method for load composition estimation using fuzzy regression. The method is examined using synthetic data to test the accuracy and robustness. The results obtained show that aggregate load composition can be estimated with acceptable accuracy using assumed load component parameters.","PeriodicalId":101495,"journal":{"name":"Proceedings of the 37th Annual North American Power Symposium, 2005.","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122693459","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}
Pub Date : 2005-12-19DOI: 10.1109/NAPS.2005.1560589
D. Tylavsky, X. Mao, G. McCulla
Eventually all large transformers are dynamically loaded using models updated regularly from field measured data. Models obtained from measured data give more accurate results than models based on transformer heat-run tests and can be easily generated using data already routinely monitored. The only significant challenge to using these models is to assess their reliability and to improve it as much as possible. In this work, we use data-quality control and data-set screening to show that model reliability can be increased by about 50% while decreasing model prediction error. These results are obtained for a linear model. We expect similar results for the nonlinear models currently being explored.
{"title":"Data screening to improve transformer thermal model reliability","authors":"D. Tylavsky, X. Mao, G. McCulla","doi":"10.1109/NAPS.2005.1560589","DOIUrl":"https://doi.org/10.1109/NAPS.2005.1560589","url":null,"abstract":"Eventually all large transformers are dynamically loaded using models updated regularly from field measured data. Models obtained from measured data give more accurate results than models based on transformer heat-run tests and can be easily generated using data already routinely monitored. The only significant challenge to using these models is to assess their reliability and to improve it as much as possible. In this work, we use data-quality control and data-set screening to show that model reliability can be increased by about 50% while decreasing model prediction error. These results are obtained for a linear model. We expect similar results for the nonlinear models currently being explored.","PeriodicalId":101495,"journal":{"name":"Proceedings of the 37th Annual North American Power Symposium, 2005.","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124177002","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}
Pub Date : 2005-12-19DOI: 10.1109/NAPS.2005.1560544
D. A. Halamay, K.M. Saxby, J. L. Bala, R. Spacek
With the ever-growing need for electric power in today's world, the power industry is being faced with both the realities of limited transmission resources and the high costs of new transmission right-of-way. High-voltage direct current (HVDC) transmission lines are a promising alternative to more traditional AC lines, offering reduced voltage drops over long distances and the possibility of reduced operating costs. With the current limits on right-of-way, however, the most cost-effective method to increase transmission capacity is by building HVDC circuits onto existing right-of-way, alongside AC transmission lines. However, the interaction between these new HVDC circuits and existing AC lines is of great concern, especially when both types of lines are placed on the same towers. Moreover, there is little existing research on the interaction between AC and HVDC transmission lines. This paper presents the outcome of a feasibility study that was undertaken to determine the severity and extent of AC/HVDC line interactions. This study focused on interactions caused by the close proximity of the transmission lines themselves, and not by connections between the circuits at either end. A three-circuit (one 115-kV AC, one 230-kV AC, and a bipolar /spl plusmn/500-kV DC) tower configuration was considered in the study, utilizing a 250-mile long transmission system and nine equivalent sources. Various faults and loading conditions were simulated on both types of lines to determine the effects of the AC circuits on the DC line, as well as the effects of the DC circuit on the AC lines. This paper presents the results of these simulations, which signify the feasibility of hybrid AC/HVDC transmission lines.
{"title":"Feasibility study of a high-voltage DC & AC multi-circuit hybrid transmission line","authors":"D. A. Halamay, K.M. Saxby, J. L. Bala, R. Spacek","doi":"10.1109/NAPS.2005.1560544","DOIUrl":"https://doi.org/10.1109/NAPS.2005.1560544","url":null,"abstract":"With the ever-growing need for electric power in today's world, the power industry is being faced with both the realities of limited transmission resources and the high costs of new transmission right-of-way. High-voltage direct current (HVDC) transmission lines are a promising alternative to more traditional AC lines, offering reduced voltage drops over long distances and the possibility of reduced operating costs. With the current limits on right-of-way, however, the most cost-effective method to increase transmission capacity is by building HVDC circuits onto existing right-of-way, alongside AC transmission lines. However, the interaction between these new HVDC circuits and existing AC lines is of great concern, especially when both types of lines are placed on the same towers. Moreover, there is little existing research on the interaction between AC and HVDC transmission lines. This paper presents the outcome of a feasibility study that was undertaken to determine the severity and extent of AC/HVDC line interactions. This study focused on interactions caused by the close proximity of the transmission lines themselves, and not by connections between the circuits at either end. A three-circuit (one 115-kV AC, one 230-kV AC, and a bipolar /spl plusmn/500-kV DC) tower configuration was considered in the study, utilizing a 250-mile long transmission system and nine equivalent sources. Various faults and loading conditions were simulated on both types of lines to determine the effects of the AC circuits on the DC line, as well as the effects of the DC circuit on the AC lines. This paper presents the results of these simulations, which signify the feasibility of hybrid AC/HVDC transmission lines.","PeriodicalId":101495,"journal":{"name":"Proceedings of the 37th Annual North American Power Symposium, 2005.","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116078218","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}
Pub Date : 2005-12-19DOI: 10.1109/NAPS.2005.1560598
J. Jiménez-González, A. Irizarry-Rivera
A big portion of the electricity generated is wasted in the form of losses. Losses occur at all levels of the power system- generation, transmission, and distribution. However, at least 75% of the total system losses occur in the distribution system. We present a study of real power losses reduction at the distribution level due to the use of solar thermal water heaters (STWHs) for Mayaguez, Puerto Rico. The electric generation displaced by STWHs was reflected in the thermoelectric generation plant, Costa Sur. The reduction of residential demand in Mayaguez was calculated to be 10 MW a day. The offset of emissions was considerable due to the generation displaced.
{"title":"Generation displacement, power losses and emissions reduction due to solar thermal water heaters","authors":"J. Jiménez-González, A. Irizarry-Rivera","doi":"10.1109/NAPS.2005.1560598","DOIUrl":"https://doi.org/10.1109/NAPS.2005.1560598","url":null,"abstract":"A big portion of the electricity generated is wasted in the form of losses. Losses occur at all levels of the power system- generation, transmission, and distribution. However, at least 75% of the total system losses occur in the distribution system. We present a study of real power losses reduction at the distribution level due to the use of solar thermal water heaters (STWHs) for Mayaguez, Puerto Rico. The electric generation displaced by STWHs was reflected in the thermoelectric generation plant, Costa Sur. The reduction of residential demand in Mayaguez was calculated to be 10 MW a day. The offset of emissions was considerable due to the generation displaced.","PeriodicalId":101495,"journal":{"name":"Proceedings of the 37th Annual North American Power Symposium, 2005.","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116448591","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}
Pub Date : 2005-12-19DOI: 10.1109/NAPS.2005.1560586
T. Thakur
This paper presents a benchmarking analysis for assessing comparative cost efficiencies of Indian State Owned Electric Utilities (SOEU), which have been mainly responsible for the generation, distribution and transmission of electricity in India. Performance of twenty-six utilities was evaluated using the non-parametric technique of data envelopment analysis (DEA), and the impact of scale on the efficiency scores was also evaluated. The results indicate that the performance of several SOEUs is sub-optimal, suggesting the potential for significant cost reductions.
{"title":"Benchmarking study for the Indian electric utilities using data envelopment analysis","authors":"T. Thakur","doi":"10.1109/NAPS.2005.1560586","DOIUrl":"https://doi.org/10.1109/NAPS.2005.1560586","url":null,"abstract":"This paper presents a benchmarking analysis for assessing comparative cost efficiencies of Indian State Owned Electric Utilities (SOEU), which have been mainly responsible for the generation, distribution and transmission of electricity in India. Performance of twenty-six utilities was evaluated using the non-parametric technique of data envelopment analysis (DEA), and the impact of scale on the efficiency scores was also evaluated. The results indicate that the performance of several SOEUs is sub-optimal, suggesting the potential for significant cost reductions.","PeriodicalId":101495,"journal":{"name":"Proceedings of the 37th Annual North American Power Symposium, 2005.","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116769926","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}
Pub Date : 2005-12-19DOI: 10.1109/NAPS.2005.1560515
G. Glanzmann, G. Andersson
Flexible AC transmission systems (FACTS) are an option to mitigate the problem of overloaded lines due to increased electric power transmission by controlling power flows and voltages. To avoid mutual influences among several devices placed in the same grid, a coordinated control is indispensable. In this paper, a supervisory controller based on optimal power flow (OPF) with multiple objectives is derived in order to avoid congestion, provide secure transmission and minimize active power losses. The contributions of SVC, TCSC and TCPST in this coordinated control and the achieved improvements compared with the case where no FACTS devices are in operation are demonstrated.
{"title":"Coordinated control of FACTS devices based on optimal power flow","authors":"G. Glanzmann, G. Andersson","doi":"10.1109/NAPS.2005.1560515","DOIUrl":"https://doi.org/10.1109/NAPS.2005.1560515","url":null,"abstract":"Flexible AC transmission systems (FACTS) are an option to mitigate the problem of overloaded lines due to increased electric power transmission by controlling power flows and voltages. To avoid mutual influences among several devices placed in the same grid, a coordinated control is indispensable. In this paper, a supervisory controller based on optimal power flow (OPF) with multiple objectives is derived in order to avoid congestion, provide secure transmission and minimize active power losses. The contributions of SVC, TCSC and TCPST in this coordinated control and the achieved improvements compared with the case where no FACTS devices are in operation are demonstrated.","PeriodicalId":101495,"journal":{"name":"Proceedings of the 37th Annual North American Power Symposium, 2005.","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128430879","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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