Pub Date : 1900-01-01DOI: 10.1109/IPEC.2005.206901
Shu Sheng, Yang Lan, Wang Jin, L. Xinran, Chen Feng
Switching sequence expert system can form switching sequence automatically according to operation knowledge of field operators but it is difficult to applied for different substations, especially those with different busbar arrangement. This paper presents the reason why it is difficult to adapt a switching sequence expert system for various substations from a point view of complexity analysis. Furthermore, the paper proposed a novel complexity reduction approach to low the difficulty in adapting of the expert system for various substations. A complexity reduction based expert system that can be adapted for 39 different substations of Changsha electric power corporation is also introduced in the paper
{"title":"A universal expert system to form switching sequence","authors":"Shu Sheng, Yang Lan, Wang Jin, L. Xinran, Chen Feng","doi":"10.1109/IPEC.2005.206901","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206901","url":null,"abstract":"Switching sequence expert system can form switching sequence automatically according to operation knowledge of field operators but it is difficult to applied for different substations, especially those with different busbar arrangement. This paper presents the reason why it is difficult to adapt a switching sequence expert system for various substations from a point view of complexity analysis. Furthermore, the paper proposed a novel complexity reduction approach to low the difficulty in adapting of the expert system for various substations. A complexity reduction based expert system that can be adapted for 39 different substations of Changsha electric power corporation is also introduced in the paper","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125230396","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 : 1900-01-01DOI: 10.1109/IPEC.2005.206925
P. Wolfs
The single wire earth return, (SWER), system is a low cost power distribution method that finds international use in rural areas, it is a key technology for the extension of grid systems. In Australia, SWER systems can cover vast areas. A single SWER system may typically supply 100 kW to several dozen customers and may extend more than 300 km. Recent changes in the Australian retail energy market structure and significant load growth are driving a requirement for new low cost methods of capacity improvement. Shunt reactors are often used in SWER systems to compensate for line charging current effects. As voltage regulation is the determining capacity factor, the replacement of fixed shunt reactors with controllable reactors provides an opportunity to significantly increase the system capacity. A case study of the North Jericho SWER system is presented which shows a capacity increase of approximately 85% can be achieved
{"title":"Capacity improvements for rural single wire earth return systems","authors":"P. Wolfs","doi":"10.1109/IPEC.2005.206925","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206925","url":null,"abstract":"The single wire earth return, (SWER), system is a low cost power distribution method that finds international use in rural areas, it is a key technology for the extension of grid systems. In Australia, SWER systems can cover vast areas. A single SWER system may typically supply 100 kW to several dozen customers and may extend more than 300 km. Recent changes in the Australian retail energy market structure and significant load growth are driving a requirement for new low cost methods of capacity improvement. Shunt reactors are often used in SWER systems to compensate for line charging current effects. As voltage regulation is the determining capacity factor, the replacement of fixed shunt reactors with controllable reactors provides an opportunity to significantly increase the system capacity. A case study of the North Jericho SWER system is presented which shows a capacity increase of approximately 85% can be achieved","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126333359","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 : 1900-01-01DOI: 10.1109/IPEC.2005.206993
P.R. Khatri, V. Jape, M. Lokhande, B. Motling
This paper highlights the case studies of steel plant and municipal corporation taking into consideration the power quality improvements. The main reason we are interested in power quality is economic value. The increasing application of electronic equipment and distributed generation has heightened the interest in power quality in recent years and this has been accompanied by special development of special terminology to describe the phenomena. Meeting customer's expectations and maintaining customer confidence are the strong motivators behind maintaining the power quality. Distributed generation has started gaining importance in our country and can become the answer for increasing the power failure. Power failure leads power interruption leading to insecure and unreliable power system
{"title":"Improving power quality by distributed generation","authors":"P.R. Khatri, V. Jape, M. Lokhande, B. Motling","doi":"10.1109/IPEC.2005.206993","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206993","url":null,"abstract":"This paper highlights the case studies of steel plant and municipal corporation taking into consideration the power quality improvements. The main reason we are interested in power quality is economic value. The increasing application of electronic equipment and distributed generation has heightened the interest in power quality in recent years and this has been accompanied by special development of special terminology to describe the phenomena. Meeting customer's expectations and maintaining customer confidence are the strong motivators behind maintaining the power quality. Distributed generation has started gaining importance in our country and can become the answer for increasing the power failure. Power failure leads power interruption leading to insecure and unreliable power system","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124707613","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 : 1900-01-01DOI: 10.1109/IPEC.2005.206904
Lixing Zhou, Weiguo Li, S.W. Su
In this paper, a new method for obtaining partial discharge (PD) characteristic based on ultra-high frequency (UHF) measurements is presented. According to electromagnetic theory, the PD electromagnetic radiation can be regarded as the dipoles radiation. Based on which, the radiation model of partial discharge pulse current is established. The waveform parameter of PD pulse current can be obtained by spectrum analysis of its radiation UHF signal, and the waveform of PD pulse current can be deduced by the time integral of its radiation UHF signal. The result of simulating experiment shows that the method for deducing PD pulse current is effective and is contributed to the PD pattern recognition and insulation defect diagnoses
{"title":"The deduction of partial discharge pulse current from its radiating UHF signal","authors":"Lixing Zhou, Weiguo Li, S.W. Su","doi":"10.1109/IPEC.2005.206904","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206904","url":null,"abstract":"In this paper, a new method for obtaining partial discharge (PD) characteristic based on ultra-high frequency (UHF) measurements is presented. According to electromagnetic theory, the PD electromagnetic radiation can be regarded as the dipoles radiation. Based on which, the radiation model of partial discharge pulse current is established. The waveform parameter of PD pulse current can be obtained by spectrum analysis of its radiation UHF signal, and the waveform of PD pulse current can be deduced by the time integral of its radiation UHF signal. The result of simulating experiment shows that the method for deducing PD pulse current is effective and is contributed to the PD pattern recognition and insulation defect diagnoses","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"123 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120825696","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 : 1900-01-01DOI: 10.1109/IPEC.2005.207029
Hongwen Yan, Rui Ma, X. Tong
This paper presents a novel fuzzy comprehensive evaluation approach based on Apriori algorithm for unit's bidding ability assessment in electricity market. The weight's value is determined by expert's knowledge in normal fuzzy comprehensive evaluation model. In proposed model, the weight's value of multi-factors is adjusted by improved Apriori algorithm to find association among many factors. Then, this method is applied to evaluate unit's bidding ability of electricity market. A set of judgment factors includes SMP, market demand, the bidding price, minimal and maximal output of the units, characteristics of costs, time constraint on starting up and cease in this model. The numerical results show that the proposed approach is right and effective. This method can precisely demonstrate the bidding units' technological and economical characteristic
{"title":"A novel fuzzy comprehensive evaluation approach based Apriori algorithm for unit's bidding ability assessment","authors":"Hongwen Yan, Rui Ma, X. Tong","doi":"10.1109/IPEC.2005.207029","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207029","url":null,"abstract":"This paper presents a novel fuzzy comprehensive evaluation approach based on Apriori algorithm for unit's bidding ability assessment in electricity market. The weight's value is determined by expert's knowledge in normal fuzzy comprehensive evaluation model. In proposed model, the weight's value of multi-factors is adjusted by improved Apriori algorithm to find association among many factors. Then, this method is applied to evaluate unit's bidding ability of electricity market. A set of judgment factors includes SMP, market demand, the bidding price, minimal and maximal output of the units, characteristics of costs, time constraint on starting up and cease in this model. The numerical results show that the proposed approach is right and effective. This method can precisely demonstrate the bidding units' technological and economical characteristic","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121110232","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 : 1900-01-01DOI: 10.1109/IPEC.2005.206945
Kong-wei Lye, S. Talukdar, L. Lave
It is widely believed that congestion in a power transmission grid allows a generator to exert market power. This paper explores the use of an alternative measure of market concentrations to the Herfindahl-Hirschman Index (HHI). The proposed index uses information about a generator's contribution to a load and computes market concentrations on a bus-by-bus basis. This allows the independent system operator (ISO) or grid operator to detect potential abuses of market power by generators due to congestion
{"title":"OPF-based power market concentrations","authors":"Kong-wei Lye, S. Talukdar, L. Lave","doi":"10.1109/IPEC.2005.206945","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206945","url":null,"abstract":"It is widely believed that congestion in a power transmission grid allows a generator to exert market power. This paper explores the use of an alternative measure of market concentrations to the Herfindahl-Hirschman Index (HHI). The proposed index uses information about a generator's contribution to a load and computes market concentrations on a bus-by-bus basis. This allows the independent system operator (ISO) or grid operator to detect potential abuses of market power by generators due to congestion","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130007012","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 : 1900-01-01DOI: 10.1109/IPEC.2005.206913
C. Rakpenthai, S. Premrudeepreechacharn, S. Uatrongjit, Neville R. Watson
This paper presents a technique for improving the phasor measurement units (PMUs) placement method recently proposed by Madtharad. The minimum condition number of the measurement matrix is used as the criteria in conjunction with sequential elimination approach to search optimal placement of this problem. Moreover, in order to minimize the communication cost, a placement-site reduction technique is performed after obtaining the solutions of placement. Numerical simulations on small and large sized power systems are compared with the Madtharad's method. The results indicate that the proposed method gives smaller condition number and the number of placement-site is successfully reduced
{"title":"An improved PMUs placement method for power system state estimation","authors":"C. Rakpenthai, S. Premrudeepreechacharn, S. Uatrongjit, Neville R. Watson","doi":"10.1109/IPEC.2005.206913","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206913","url":null,"abstract":"This paper presents a technique for improving the phasor measurement units (PMUs) placement method recently proposed by Madtharad. The minimum condition number of the measurement matrix is used as the criteria in conjunction with sequential elimination approach to search optimal placement of this problem. Moreover, in order to minimize the communication cost, a placement-site reduction technique is performed after obtaining the solutions of placement. Numerical simulations on small and large sized power systems are compared with the Madtharad's method. The results indicate that the proposed method gives smaller condition number and the number of placement-site is successfully reduced","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131064150","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 : 1900-01-01DOI: 10.1109/IPEC.2005.207004
C. Weihua, Jiang Quanyuan, Cao Yijia
With the increasing utilization of HVDC system, security assessment of HVDC system has become a hot topic. This paper presents a novel approach using the framework of vulnerability to assess HVDC system security. First, equivalent models of HVDC systems, based on Markov model and logical diagram, are built to solve "dimension disaster" problem. Second, the risk index is used as an indicator of the level of security, and its sensitivity to a changing system parameter is used as an indicator of its trend. These two indicators are combined to determine the degree of HVDC system vulnerability to contingent disturbances. Finally, artificial neural network (ANN) is applied to the fast pattern recognition and classification of system vulnerability status. A case of Gezhouba-Shanghai HVDC system in China is presented to verify correctness and effectiveness of the approach
{"title":"Risk based vulnerability assessment for HVDC transmission system","authors":"C. Weihua, Jiang Quanyuan, Cao Yijia","doi":"10.1109/IPEC.2005.207004","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207004","url":null,"abstract":"With the increasing utilization of HVDC system, security assessment of HVDC system has become a hot topic. This paper presents a novel approach using the framework of vulnerability to assess HVDC system security. First, equivalent models of HVDC systems, based on Markov model and logical diagram, are built to solve \"dimension disaster\" problem. Second, the risk index is used as an indicator of the level of security, and its sensitivity to a changing system parameter is used as an indicator of its trend. These two indicators are combined to determine the degree of HVDC system vulnerability to contingent disturbances. Finally, artificial neural network (ANN) is applied to the fast pattern recognition and classification of system vulnerability status. A case of Gezhouba-Shanghai HVDC system in China is presented to verify correctness and effectiveness of the approach","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133235051","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 : 1900-01-01DOI: 10.1109/IPEC.2005.206950
Zhengjun Liu, Hongming Yang, M. Lai
This paper proposes an electricity price forecasting model based on chaos theory. First the chaotic feature of electricity price is verified with the chaos theory. The Lyapunov exponents and the fractal dimensions of the attractors are extracted. Here it can be seen that the electricity price possesses chaotic characteristics, providing the basis for performing the short-term forecast of electricity price with the help of the chaos theory. Then an accurate phase space is reconstructed by multivariable time series constituted by electricity price and its correlated factors, i.e., the system load and the available generating capacity time series. By tracing the evolving trend of the adjacent phase points in the phase space, the global and local electricity price forecasting models based on the recurrent neural network are established, with which the electricity prices in the New England electricity market are successfully predicted
{"title":"Electricity price forecasting model based on chaos theory","authors":"Zhengjun Liu, Hongming Yang, M. Lai","doi":"10.1109/IPEC.2005.206950","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206950","url":null,"abstract":"This paper proposes an electricity price forecasting model based on chaos theory. First the chaotic feature of electricity price is verified with the chaos theory. The Lyapunov exponents and the fractal dimensions of the attractors are extracted. Here it can be seen that the electricity price possesses chaotic characteristics, providing the basis for performing the short-term forecast of electricity price with the help of the chaos theory. Then an accurate phase space is reconstructed by multivariable time series constituted by electricity price and its correlated factors, i.e., the system load and the available generating capacity time series. By tracing the evolving trend of the adjacent phase points in the phase space, the global and local electricity price forecasting models based on the recurrent neural network are established, with which the electricity prices in the New England electricity market are successfully predicted","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133307661","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 : 1900-01-01DOI: 10.1109/IPEC.2005.206932
S. Sato, T. Harada, M. Hanai
There are IEC 60060-1 requirements on three impulse current waveforms. For the damped-oscillating waves, margins of the front time T1 and the time to half the peak T2 are 10 per cent whilst any value after the polarity reversal has to be less than 20 per cent of the peak value. Authors have tried to construct impulse current calibrator for reference measuring system, which would generate a waveform having the time parameters quite close to ideals. After numerous simulations in selecting values for circuit composing components, authors came to an impression that a damped-oscillating current generator whose output waveform has parameter values close to standard. In the paper, authors' "impression" is theoretically proved and mathematically possible margins are to be presented in detail.
{"title":"IEC 60060- 1 Requirements in Impulse Current Waveform Parameters","authors":"S. Sato, T. Harada, M. Hanai","doi":"10.1109/IPEC.2005.206932","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206932","url":null,"abstract":"There are IEC 60060-1 requirements on three impulse current waveforms. For the damped-oscillating waves, margins of the front time T1 and the time to half the peak T2 are 10 per cent whilst any value after the polarity reversal has to be less than 20 per cent of the peak value. Authors have tried to construct impulse current calibrator for reference measuring system, which would generate a waveform having the time parameters quite close to ideals. After numerous simulations in selecting values for circuit composing components, authors came to an impression that a damped-oscillating current generator whose output waveform has parameter values close to standard. In the paper, authors' \"impression\" is theoretically proved and mathematically possible margins are to be presented in detail.","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132209699","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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