Pub Date : 2002-12-10DOI: 10.1109/MPER.2002.4312305
O. Youssef
Summary form only given as follows. In long line applications that involve tripping the faulted phase in case of LG faults, the single-pole autoreclosure is extensively used. Traditional phase selectors can suffer some deficiencies in their performance due to varying system and fault conditions. However, the advent of wavelet transform techniques with their ability to focus on system transients provide an effective and reliable method for accurate and fast phase selection. This work describes the design and implementation of a new technique using wavelet transform algorithms. The technique is based on utilising sharp transitions generated on the faulted phase. The paper presents the wavelet transform concept and its value in classification techniques and feature detection schemes. The feature extraction principle is derived. Generated data from the simulation of 400 kV power system using EMTP were used to test the performance of the technique.
{"title":"New algorithm to phase selection based on wavelet transforms","authors":"O. Youssef","doi":"10.1109/MPER.2002.4312305","DOIUrl":"https://doi.org/10.1109/MPER.2002.4312305","url":null,"abstract":"Summary form only given as follows. In long line applications that involve tripping the faulted phase in case of LG faults, the single-pole autoreclosure is extensively used. Traditional phase selectors can suffer some deficiencies in their performance due to varying system and fault conditions. However, the advent of wavelet transform techniques with their ability to focus on system transients provide an effective and reliable method for accurate and fast phase selection. This work describes the design and implementation of a new technique using wavelet transform algorithms. The technique is based on utilising sharp transitions generated on the faulted phase. The paper presents the wavelet transform concept and its value in classification techniques and feature detection schemes. The feature extraction principle is derived. Generated data from the simulation of 400 kV power system using EMTP were used to test the performance of the technique.","PeriodicalId":117177,"journal":{"name":"IEEE Power Engineering Society Summer Meeting,","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125266866","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 : 2002-11-07DOI: 10.1109/MPER.2002.4312149
H. J. Li, S. Birlasekaran, S. Choi
Summary form only given, as follows. A simple numerical technique to identify the parameters of metal-oxide arrester models is described. Using measured arrester voltage obtained under impulse test condition, the arrester parameters are determined using an optimization technique. The validity and the accuracy of the model are then assessed by comparing the predicted against the measured values of arrester energy, initial slope, residual voltage and the overall deviation. Application of the arrester model on network system studies is illustrated.
{"title":"A parameter identification technique for metal-oxide surge arrester models","authors":"H. J. Li, S. Birlasekaran, S. Choi","doi":"10.1109/MPER.2002.4312149","DOIUrl":"https://doi.org/10.1109/MPER.2002.4312149","url":null,"abstract":"Summary form only given, as follows. A simple numerical technique to identify the parameters of metal-oxide arrester models is described. Using measured arrester voltage obtained under impulse test condition, the arrester parameters are determined using an optimization technique. The validity and the accuracy of the model are then assessed by comparing the predicted against the measured values of arrester energy, initial slope, residual voltage and the overall deviation. Application of the arrester model on network system studies is illustrated.","PeriodicalId":117177,"journal":{"name":"IEEE Power Engineering Society Summer Meeting,","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132535707","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 : 2002-08-07DOI: 10.1109/MPER.2002.4312141
A. K. David, Xujun Lin
Summary form only given as follows. The work presented in this paper describes a scheme for rescheduling pool generation and adjusting contract-transactions for dynamic security enhancement when necessary, using a power market auction mechanism. The procedure is based on the transient energy margin concept, which is estimated using the corrected hybrid method of transient stability analysis. This index is selected because of useful linearity properties which it possesses with respect to certain important problem control variables. The proposed scheme brings together both technical and economic considerations and the procedure is illustrated using the New England System data set.
{"title":"Dynamic security enhancement in power-market systems","authors":"A. K. David, Xujun Lin","doi":"10.1109/MPER.2002.4312141","DOIUrl":"https://doi.org/10.1109/MPER.2002.4312141","url":null,"abstract":"Summary form only given as follows. The work presented in this paper describes a scheme for rescheduling pool generation and adjusting contract-transactions for dynamic security enhancement when necessary, using a power market auction mechanism. The procedure is based on the transient energy margin concept, which is estimated using the corrected hybrid method of transient stability analysis. This index is selected because of useful linearity properties which it possesses with respect to certain important problem control variables. The proposed scheme brings together both technical and economic considerations and the procedure is illustrated using the New England System data set.","PeriodicalId":117177,"journal":{"name":"IEEE Power Engineering Society Summer Meeting,","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132676837","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 : 2002-08-01DOI: 10.1109/MPER.2002.4312515
W Bassi, J. M. Janiszewski
Summary form only given, as follows. This paper presents an evaluation of the values of currents and charges absorbed by surge protective devices (SPDs) connected in low-voltage open-wire overhead distribution networks in the case of direct lightning strikes to primary lines. Also, some information about overvoltages magnitude is included. The calculations have been performed using the ATP (Alternative Transients Program). The modeling of the system components includes the insulation characteristics (voltage versus time to breakdown) of the primary and secondary insulators and a distribution transformer model for high frequencies which takes into account the load conditions. Some parameters of interest are taken into consideration in the analysis, such as ground resistances of poles and consumers, lightning strike position and crest value of the stroke current.
{"title":"Evaluation of currents and charges in low-voltage surge arresters due to lightning strikes","authors":"W Bassi, J. M. Janiszewski","doi":"10.1109/MPER.2002.4312515","DOIUrl":"https://doi.org/10.1109/MPER.2002.4312515","url":null,"abstract":"Summary form only given, as follows. This paper presents an evaluation of the values of currents and charges absorbed by surge protective devices (SPDs) connected in low-voltage open-wire overhead distribution networks in the case of direct lightning strikes to primary lines. Also, some information about overvoltages magnitude is included. The calculations have been performed using the ATP (Alternative Transients Program). The modeling of the system components includes the insulation characteristics (voltage versus time to breakdown) of the primary and secondary insulators and a distribution transformer model for high frequencies which takes into account the load conditions. Some parameters of interest are taken into consideration in the analysis, such as ground resistances of poles and consumers, lightning strike position and crest value of the stroke current.","PeriodicalId":117177,"journal":{"name":"IEEE Power Engineering Society Summer Meeting,","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129331109","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 : 2002-07-25DOI: 10.1109/PESS.2002.1043450
Y. Yoon, F. Felder
In this paper, the authors first review the method of computing loss of load probability (LOLP) as a means of assessing reliability. Then, they relate the method to the installed capacity (ICAP) mechanisms, which are currently being implemented in some regional US electricity markets as a necessary market process for ensuring long term reliability. The basic conclusion of the paper is that the current ICAP mechanisms do not accurately ensure a desired level of reliability, as intended. The reason for this situation is because the current ICAP mechanisms consider the expected value of available generation, which is only the first order simplification of probabilistic generator capacity modeling, while ignoring the second and higher orders. They use simple examples to illustrate this claim and its implications. The incentives created through ICAP mechanisms directly impact the investment decisions of new generation and transmission. Therefore, the findings presented in the paper are critical as we move forward with the restructuring process. To achieve the desired level of reliability through market process, this paper may lead to understanding better the necessary modifications to the current ICAP mechanisms.
{"title":"Study of loss of load probability in designing installed capacity market","authors":"Y. Yoon, F. Felder","doi":"10.1109/PESS.2002.1043450","DOIUrl":"https://doi.org/10.1109/PESS.2002.1043450","url":null,"abstract":"In this paper, the authors first review the method of computing loss of load probability (LOLP) as a means of assessing reliability. Then, they relate the method to the installed capacity (ICAP) mechanisms, which are currently being implemented in some regional US electricity markets as a necessary market process for ensuring long term reliability. The basic conclusion of the paper is that the current ICAP mechanisms do not accurately ensure a desired level of reliability, as intended. The reason for this situation is because the current ICAP mechanisms consider the expected value of available generation, which is only the first order simplification of probabilistic generator capacity modeling, while ignoring the second and higher orders. They use simple examples to illustrate this claim and its implications. The incentives created through ICAP mechanisms directly impact the investment decisions of new generation and transmission. Therefore, the findings presented in the paper are critical as we move forward with the restructuring process. To achieve the desired level of reliability through market process, this paper may lead to understanding better the necessary modifications to the current ICAP mechanisms.","PeriodicalId":117177,"journal":{"name":"IEEE Power Engineering Society Summer Meeting,","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115601124","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 : 2002-07-25DOI: 10.1109/PESS.2002.1043209
Summary form only given, as follows. There have been major improvements in the cost, efficiency and reliability of PV systems over the last two decades. Despite impressive progress, the cost of PV energy is still higher than traditional grid electricity (at grid accessible locations). Grid electricity typically costs between 5 and 15 cents per kilowatt-hour. Whereas, PV energy currently costs from about 20 to 50 cents per kilowatt-hour depending on the solar resource availability, the PV technology, and the system design features. For PV to be cost competitive with grid power requires continued improvement in PV technologies that further reduce the cost as well as the use of higher-value PV applications (such as building integrated PV products or local reliability enhancement) that take advantage of an ancillary benefit of onsite PV generation. This presentation discusses some of the emerging PV technologies and the use of higher-value ancillary service applications that can make a difference in the economic viability of PV.
{"title":"Enhancing the economics of photovoltaics through the use of advanced PV technologies and high value applications","authors":"","doi":"10.1109/PESS.2002.1043209","DOIUrl":"https://doi.org/10.1109/PESS.2002.1043209","url":null,"abstract":"Summary form only given, as follows. There have been major improvements in the cost, efficiency and reliability of PV systems over the last two decades. Despite impressive progress, the cost of PV energy is still higher than traditional grid electricity (at grid accessible locations). Grid electricity typically costs between 5 and 15 cents per kilowatt-hour. Whereas, PV energy currently costs from about 20 to 50 cents per kilowatt-hour depending on the solar resource availability, the PV technology, and the system design features. For PV to be cost competitive with grid power requires continued improvement in PV technologies that further reduce the cost as well as the use of higher-value PV applications (such as building integrated PV products or local reliability enhancement) that take advantage of an ancillary benefit of onsite PV generation. This presentation discusses some of the emerging PV technologies and the use of higher-value ancillary service applications that can make a difference in the economic viability of PV.","PeriodicalId":117177,"journal":{"name":"IEEE Power Engineering Society Summer Meeting,","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115661132","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 : 2002-07-25DOI: 10.1109/PESS.2002.1043386
C. Pon
As overhead conductors and groundwires age substantially beyond their respective design lives, there is increasing pressure on owners of these assets to know their present physical condition to help make decisions on major capital expenditures. Physical assessment is the only way of knowing the current condition of conductors and groundwires with any degree of reliability and accuracy. This discussion presents some laboratory tests that have been used to assess the condition of conductors and groundwires. It is beyond the scope of the discussion to define end of life or remaining life.
{"title":"Laboratory testing of aged conductors and groundwires","authors":"C. Pon","doi":"10.1109/PESS.2002.1043386","DOIUrl":"https://doi.org/10.1109/PESS.2002.1043386","url":null,"abstract":"As overhead conductors and groundwires age substantially beyond their respective design lives, there is increasing pressure on owners of these assets to know their present physical condition to help make decisions on major capital expenditures. Physical assessment is the only way of knowing the current condition of conductors and groundwires with any degree of reliability and accuracy. This discussion presents some laboratory tests that have been used to assess the condition of conductors and groundwires. It is beyond the scope of the discussion to define end of life or remaining life.","PeriodicalId":117177,"journal":{"name":"IEEE Power Engineering Society Summer Meeting,","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116804140","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 : 2002-07-25DOI: 10.1109/PESS.2002.1043236
B. Vandiver
UCA based protective relays use high-speed peer-to-peer communications to Implement distributed protection schemes or to replace hard wired Interface between relays with GOOSE messages defined by UCA 2.0 and JEC 61850. The paper presents the requirements for testing of such devices, including the specifics of simulation of the substation environment and monitoring of the performance of the relay under test.
{"title":"Testing of UCA based microprocessor based protective relays","authors":"B. Vandiver","doi":"10.1109/PESS.2002.1043236","DOIUrl":"https://doi.org/10.1109/PESS.2002.1043236","url":null,"abstract":"UCA based protective relays use high-speed peer-to-peer communications to Implement distributed protection schemes or to replace hard wired Interface between relays with GOOSE messages defined by UCA 2.0 and JEC 61850. The paper presents the requirements for testing of such devices, including the specifics of simulation of the substation environment and monitoring of the performance of the relay under test.","PeriodicalId":117177,"journal":{"name":"IEEE Power Engineering Society Summer Meeting,","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125115892","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 : 2002-07-25DOI: 10.1109/PESS.2002.1043266
M. Elborki, P. Crossley, Z. Wang, A. Darwin, G. Edwards
Experimental investigation into the behaviour of partial discharges (PD) in different types of defect models are described in this paper. The models were used to study the waveshape and frequency spectra of the signals resulting from discharges. This information is then used to investigate the effect on the signals of the type of discharge. The circuit configuration and data acquisition system are also described. Typical insulation defect models were designed and used to investigate the relationship between PD activity and insulation type. Descriptions of the test results obtained for three types of PDs are described. They include corona, surface discharge along the insulation pressboard in oil and discharge along the outer surface of a bushing. The signals were collected by a wide-band PD measurement system. Analyses of the signals indicate that the type of PD source can be determined using the high frequency components of the spectra. This conclusion is very important in the high-frequency range and importance in the diagnosis process used for PD identification in power transformers.
{"title":"Detection and characterisation of partial discharges in transformer defect models","authors":"M. Elborki, P. Crossley, Z. Wang, A. Darwin, G. Edwards","doi":"10.1109/PESS.2002.1043266","DOIUrl":"https://doi.org/10.1109/PESS.2002.1043266","url":null,"abstract":"Experimental investigation into the behaviour of partial discharges (PD) in different types of defect models are described in this paper. The models were used to study the waveshape and frequency spectra of the signals resulting from discharges. This information is then used to investigate the effect on the signals of the type of discharge. The circuit configuration and data acquisition system are also described. Typical insulation defect models were designed and used to investigate the relationship between PD activity and insulation type. Descriptions of the test results obtained for three types of PDs are described. They include corona, surface discharge along the insulation pressboard in oil and discharge along the outer surface of a bushing. The signals were collected by a wide-band PD measurement system. Analyses of the signals indicate that the type of PD source can be determined using the high frequency components of the spectra. This conclusion is very important in the high-frequency range and importance in the diagnosis process used for PD identification in power transformers.","PeriodicalId":117177,"journal":{"name":"IEEE Power Engineering Society Summer Meeting,","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126873440","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 : 2002-07-25DOI: 10.1109/PESS.2002.1043620
R. Caire, N. Retière, Sylvain Martino, C. Andrieu, N. Hadjsaid
Utility power systems are faced to an increasing number of small size producers requiring interconnection particularly to the low voltage (LV) network. Since most distribution systems are not designed to "receive" large scale power injections, these small generation units may impact these networks specifically in terms of quality of the energy delivered, reliability and safety of the whole distribution system from LV to medium voltage (MV) levels. In this paper, a methodology, based on a parametric study, is proposed to investigate distributed generation (DG) impacts when interconnected to distribution networks. The proposed methodology has been validated for a particular case of voltage profile (LV/MV). The test system used for this study is a real urban network containing 11 feeders with 2 transformers of 36 MVA.
{"title":"Impact assessment of LV distributed generation on MV distribution network","authors":"R. Caire, N. Retière, Sylvain Martino, C. Andrieu, N. Hadjsaid","doi":"10.1109/PESS.2002.1043620","DOIUrl":"https://doi.org/10.1109/PESS.2002.1043620","url":null,"abstract":"Utility power systems are faced to an increasing number of small size producers requiring interconnection particularly to the low voltage (LV) network. Since most distribution systems are not designed to \"receive\" large scale power injections, these small generation units may impact these networks specifically in terms of quality of the energy delivered, reliability and safety of the whole distribution system from LV to medium voltage (MV) levels. In this paper, a methodology, based on a parametric study, is proposed to investigate distributed generation (DG) impacts when interconnected to distribution networks. The proposed methodology has been validated for a particular case of voltage profile (LV/MV). The test system used for this study is a real urban network containing 11 feeders with 2 transformers of 36 MVA.","PeriodicalId":117177,"journal":{"name":"IEEE Power Engineering Society Summer Meeting,","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122412666","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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