Pub Date : 2006-10-16DOI: 10.1109/PES.2006.1709462
Dong Liu, Yun-ping Chen, Youping Fan, Guang Shen
The paper introduced the attempt to apply the association rule mining (ARM) method to discovering heuristic rules for power system restoration (PSR) to guide a fast restoration process. In order to employ the popular algorithms of ARM, the process of PSR is represented as a series of actions out of a finite action set. The interesting attributes of each action are mapped as items and the actions are mapped as transactions. Fuzzy set and clustering method are adopted to evaluate the performance of individual action. A sample test is given to demonstrate the validity of the proposed method
{"title":"The application of association rule mining in power system restoration","authors":"Dong Liu, Yun-ping Chen, Youping Fan, Guang Shen","doi":"10.1109/PES.2006.1709462","DOIUrl":"https://doi.org/10.1109/PES.2006.1709462","url":null,"abstract":"The paper introduced the attempt to apply the association rule mining (ARM) method to discovering heuristic rules for power system restoration (PSR) to guide a fast restoration process. In order to employ the popular algorithms of ARM, the process of PSR is represented as a series of actions out of a finite action set. The interesting attributes of each action are mapped as items and the actions are mapped as transactions. Fuzzy set and clustering method are adopted to evaluate the performance of individual action. A sample test is given to demonstrate the validity of the proposed method","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130540119","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 : 2006-05-08DOI: 10.1109/IPEC.2005.207076
Mao Anjia, Guo Zhizhong
Secure and reliable operation of power system is significant for nation's economy development and society stability. To ascertain this, analysis and calculation plays an important role. Power system calculations can be classified into three categories in time domain: for the past, for the present and for the future respectively. And the calculations for the future seem to be more significant to support power system operation and make production arrangement. However, almost all the calculations of power system are based on the mathematic models established from the physical system; and the models may have various errors and mismatch the actual system, especially for the calculations facing the future. The mismatch between calculation model and actual system influences the analysis result and the operation of power system. Aimed at the possible mismatch between calculation model and actual power system, this paper analyzes the influences of bus operating mode, transmission line operating mode, load distribution and quantity respectively on power system transient stability. The results show that the mismatch of grid structure can influence power system stability more greatly than loads do. As the mismatch between calculation model and actual system always exists, this paper also suggests that power system analysis should depend more on measurements rather than calculation model
{"title":"The influence of model mismatch to power system calculation, part II: on the stability calculation","authors":"Mao Anjia, Guo Zhizhong","doi":"10.1109/IPEC.2005.207076","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207076","url":null,"abstract":"Secure and reliable operation of power system is significant for nation's economy development and society stability. To ascertain this, analysis and calculation plays an important role. Power system calculations can be classified into three categories in time domain: for the past, for the present and for the future respectively. And the calculations for the future seem to be more significant to support power system operation and make production arrangement. However, almost all the calculations of power system are based on the mathematic models established from the physical system; and the models may have various errors and mismatch the actual system, especially for the calculations facing the future. The mismatch between calculation model and actual system influences the analysis result and the operation of power system. Aimed at the possible mismatch between calculation model and actual power system, this paper analyzes the influences of bus operating mode, transmission line operating mode, load distribution and quantity respectively on power system transient stability. The results show that the mismatch of grid structure can influence power system stability more greatly than loads do. As the mismatch between calculation model and actual system always exists, this paper also suggests that power system analysis should depend more on measurements rather than calculation model","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116451958","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 : 2006-05-08DOI: 10.1109/IPEC.2005.206991
G. Celli, F. Pilo, G. Pisano, G. G. Soma
The interconnection of large amounts of nontraditional generation causes problems in a network designed for 'conventional' operation. A microgrid consists of a combination of generation sources, loads and energy storage interfaced through fast acting power electronics. The aim of operating microgrid sub-systems is to move away from considering DG as badly behaved system components, of which a limited amount can be tolerated in an area, to 'good citizens'. The paper is focused on the development of a novel energy management system (EMS) based on the application of neural networks (NN). The EMS is able to autonomously make decisions and determine hour by hour the correct dispatch of generators with the final goal of minimising the global energy costs. The application of the EMS to a small test case has showed significant saves in the global energy bill by using typical Italian energy and fuel price data
{"title":"Optimal participation of a microgrid to the energy market with an intelligent EMS","authors":"G. Celli, F. Pilo, G. Pisano, G. G. Soma","doi":"10.1109/IPEC.2005.206991","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206991","url":null,"abstract":"The interconnection of large amounts of nontraditional generation causes problems in a network designed for 'conventional' operation. A microgrid consists of a combination of generation sources, loads and energy storage interfaced through fast acting power electronics. The aim of operating microgrid sub-systems is to move away from considering DG as badly behaved system components, of which a limited amount can be tolerated in an area, to 'good citizens'. The paper is focused on the development of a novel energy management system (EMS) based on the application of neural networks (NN). The EMS is able to autonomously make decisions and determine hour by hour the correct dispatch of generators with the final goal of minimising the global energy costs. The application of the EMS to a small test case has showed significant saves in the global energy bill by using typical Italian energy and fuel price data","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129786490","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 : 2005-11-29DOI: 10.1109/IPEC.2005.206942
M. Mustafa, H. Shareef, M.R. Ahmad
This paper suggests an improved method for usage allocation to individual generators in a deregulated power system. Based on solved load flow, the method converts power injections and line flows into real and imaginary current injections and flows. These currents are then represented independently as real and imaginary current networks. Since current networks are acyclic lossless networks, proportional sharing principle and graph theory is used to trace the relationship between current sources and current sinks. The contributions from each current source are finally translated into power contributions to each load, line flows and losses. IEEE 14-bus test system is used to illustrate the effectiveness of the method. Comparison of the results with previous methods is also given
{"title":"An improved usage allocation method for deregulated transmission systems","authors":"M. Mustafa, H. Shareef, M.R. Ahmad","doi":"10.1109/IPEC.2005.206942","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206942","url":null,"abstract":"This paper suggests an improved method for usage allocation to individual generators in a deregulated power system. Based on solved load flow, the method converts power injections and line flows into real and imaginary current injections and flows. These currents are then represented independently as real and imaginary current networks. Since current networks are acyclic lossless networks, proportional sharing principle and graph theory is used to trace the relationship between current sources and current sinks. The contributions from each current source are finally translated into power contributions to each load, line flows and losses. IEEE 14-bus test system is used to illustrate the effectiveness of the method. Comparison of the results with previous methods is also given","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126334625","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 : 2005-11-29DOI: 10.1109/IPEC.2005.207059
Mohd Wazir Mustafa, M. R. Ahmad, Hussain Shareef
High phase order transmission system is being considered a viable alternative for increasing the power transmission capability of overhead electric power transmission over existing right-of-way. This paper presents the faults analysis of six-phase transmission system. In this context, fault analysis has been conducted on the Goudey-Oakdale 2-bus test system. The results of these investigations are presented in the form of typical time responses. The PSCAD/EMTDC is used for the simulation studies
{"title":"Fault analysis on double three-phase to six-phase converted transmission line","authors":"Mohd Wazir Mustafa, M. R. Ahmad, Hussain Shareef","doi":"10.1109/IPEC.2005.207059","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207059","url":null,"abstract":"High phase order transmission system is being considered a viable alternative for increasing the power transmission capability of overhead electric power transmission over existing right-of-way. This paper presents the faults analysis of six-phase transmission system. In this context, fault analysis has been conducted on the Goudey-Oakdale 2-bus test system. The results of these investigations are presented in the form of typical time responses. The PSCAD/EMTDC is used for the simulation studies","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131257391","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 : 2005-11-29DOI: 10.1109/IPEC.2005.206980
H. Ahmad, L. Ong
Power stations may face huge losses and damage when struck by lightning. Much effort has been carried out to find an alternative to the conventional lightning air terminal for direct protection to power stations. One of the alternative is to modify the tip configuration of conventional air terminals to enable it to be better inceptor. This paper looks into such possibility by designing and testing different tip configuration air terminals, i.e. sharp, blunt, flat, conical and concave. Tests in high voltage laboratory revealed that blunt air terminal has lower breakdown voltage and longer time to breakdown compared to other air terminals. This suggests that the performance of blunt rod is better than other rods. Based on the laboratory experimental studies, the modification of air terminal geometrical tip could be an alternative for future application specifically for the lightning protection of power stations against direct strokes
{"title":"An account of a modified lightning protection system for power stations","authors":"H. Ahmad, L. Ong","doi":"10.1109/IPEC.2005.206980","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206980","url":null,"abstract":"Power stations may face huge losses and damage when struck by lightning. Much effort has been carried out to find an alternative to the conventional lightning air terminal for direct protection to power stations. One of the alternative is to modify the tip configuration of conventional air terminals to enable it to be better inceptor. This paper looks into such possibility by designing and testing different tip configuration air terminals, i.e. sharp, blunt, flat, conical and concave. Tests in high voltage laboratory revealed that blunt air terminal has lower breakdown voltage and longer time to breakdown compared to other air terminals. This suggests that the performance of blunt rod is better than other rods. Based on the laboratory experimental studies, the modification of air terminal geometrical tip could be an alternative for future application specifically for the lightning protection of power stations against direct strokes","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124586221","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}
P. Naesje, B. I. Langdal, H. Torvatn, H. T. Ylvisaker
This paper reviews the current state of use of digital NIS (network information system) among grid operators. Empirical findings reveal that more attention should be paid to the organizational issues. The paper argues, in line with existing literature, that workers' understanding of the uses and application of data and the ICT-system is central for maintaining data integrity and achieving effective work practices. However, in complex data-use situations, use across organizational borders and organizational lag (from mergers, acquisitions and reorganizing) is an equally important factor for data integrity and more effective work practices as workers understanding per se. The way ahead for the businesses is to improving information flow between system owners and users, bettering data design, integrated data and task in a more radical way, and ground data in the cutting edge examples of organizational practices that can be found
{"title":"Strategic challenges in implementing NIS: investigations on data quality management","authors":"P. Naesje, B. I. Langdal, H. Torvatn, H. T. Ylvisaker","doi":"10.1049/CP:20051384","DOIUrl":"https://doi.org/10.1049/CP:20051384","url":null,"abstract":"This paper reviews the current state of use of digital NIS (network information system) among grid operators. Empirical findings reveal that more attention should be paid to the organizational issues. The paper argues, in line with existing literature, that workers' understanding of the uses and application of data and the ICT-system is central for maintaining data integrity and achieving effective work practices. However, in complex data-use situations, use across organizational borders and organizational lag (from mergers, acquisitions and reorganizing) is an equally important factor for data integrity and more effective work practices as workers understanding per se. The way ahead for the businesses is to improving information flow between system owners and users, bettering data design, integrated data and task in a more radical way, and ground data in the cutting edge examples of organizational practices that can be found","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129623108","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.2005.206877
Liu Jin, Ziyang Liu, Jingbo Sun, Xinying Song
This paper describes the peak load characteristics of power systems. A new method for the peak load forecasting (PLF) is proposed by means of an integration technique, which combines fuzzy clustering with feed-forward neural network (FNN) of the Levenberg-Maruardt (LM) training algorithm. Compared with the traditional back propagation (BP) algorithm, the proposed method proves more efficient to the predicted accuracy during the peak load period by using actual data of a power grid in China
{"title":"An efficient method for peak load forecasting","authors":"Liu Jin, Ziyang Liu, Jingbo Sun, Xinying Song","doi":"10.1109/IPEC.2005.206877","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206877","url":null,"abstract":"This paper describes the peak load characteristics of power systems. A new method for the peak load forecasting (PLF) is proposed by means of an integration technique, which combines fuzzy clustering with feed-forward neural network (FNN) of the Levenberg-Maruardt (LM) training algorithm. Compared with the traditional back propagation (BP) algorithm, the proposed method proves more efficient to the predicted accuracy during the peak load period by using actual data of a power grid in China","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"31 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":"123155383","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.2005.206921
K. Krueger, M. Sonnenschein, C. Unger, R. Zurowski
Disturbances in industrial power systems due to oscillations of several kilohertz (1 .. 20 kHz) superimposed to the fundamental became more and more important in recent years especially in installations where the majority of the load consists of power electronics. Measurement results as well as examples from several cases of disturbances investigated by the authors is presented. The effects of these disturbances vary in a wide range such as malfunction of electronic office equipment, blown power supply units, or unacceptable noise. The paper discusses mitigation measures to solve such problems such as introducing special filters or additional damping. Specific problems and limitations of different solutions is addressed and examples provided
{"title":"Measures for the limitation of voltage distortion in the kHz range","authors":"K. Krueger, M. Sonnenschein, C. Unger, R. Zurowski","doi":"10.1109/IPEC.2005.206921","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206921","url":null,"abstract":"Disturbances in industrial power systems due to oscillations of several kilohertz (1 .. 20 kHz) superimposed to the fundamental became more and more important in recent years especially in installations where the majority of the load consists of power electronics. Measurement results as well as examples from several cases of disturbances investigated by the authors is presented. The effects of these disturbances vary in a wide range such as malfunction of electronic office equipment, blown power supply units, or unacceptable noise. The paper discusses mitigation measures to solve such problems such as introducing special filters or additional damping. Specific problems and limitations of different solutions is addressed and examples provided","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"34 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121003576","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.2005.206959
Z. Yin, Lixia Zhou
Voltage problems can be effectively solved by series compensators coupled with series injection transformers. However, the magnetic flux in iron core of series transformer may change in a large range depending on the close angle of injecting voltage, at the same time iron core easily get over saturated. Over saturation in transformer iron core leads to produce large field inrush current and distortion on compensating voltage wave, bring about hazard to operation of transformer and inverter, also increase the possibility of relay mishandling and finally decrease reliability of power supply. This paper analyzes the over saturation mechanism of series injection transformer and presents a novel harmonics injection control approach to suppress. The validity of proposed approach is verified by calculation and simulation
{"title":"A novel harmonics injecting approach on over saturation suppression of DVR series injection transformer","authors":"Z. Yin, Lixia Zhou","doi":"10.1109/IPEC.2005.206959","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206959","url":null,"abstract":"Voltage problems can be effectively solved by series compensators coupled with series injection transformers. However, the magnetic flux in iron core of series transformer may change in a large range depending on the close angle of injecting voltage, at the same time iron core easily get over saturated. Over saturation in transformer iron core leads to produce large field inrush current and distortion on compensating voltage wave, bring about hazard to operation of transformer and inverter, also increase the possibility of relay mishandling and finally decrease reliability of power supply. This paper analyzes the over saturation mechanism of series injection transformer and presents a novel harmonics injection control approach to suppress. The validity of proposed approach is verified by calculation and simulation","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"4 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":"121025916","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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