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1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)最新文献

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Very small hydroelectric plants-their influence on the supply network 非常小的水力发电厂——它们对供电网络的影响
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 2000-09-01 DOI: 10.1109/TDC.1999.755334
J. Voršič, A. Orgulan, M. Horvat, D. Koritnik
{"title":"Very small hydroelectric plants-their influence on the supply network","authors":"J. Voršič, A. Orgulan, M. Horvat, D. Koritnik","doi":"10.1109/TDC.1999.755334","DOIUrl":"https://doi.org/10.1109/TDC.1999.755334","url":null,"abstract":"Interest in building small hydroelectric power plants is growing of late. The problems that occur are mostly caused by the lack of national standards, which should more clearly define the allowed influence of such power stations and their generators on power network voltage distortion. Investors often do not know whether it is necessary to invest in extra equipment for meeting voltage and current quality standards. The authors made some measurements of the influence of very small hydroelectric power stations in the field and in their laboratories, which are described in this paper.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124678052","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}
引用次数: 7
Transmission planning in a deregulated environment 放松管制环境下的输电规划
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.755377
Zhao Xu, Zhao Yang Dong, K. Wong
{"title":"Transmission planning in a deregulated environment","authors":"Zhao Xu, Zhao Yang Dong, K. Wong","doi":"10.1109/TDC.1999.755377","DOIUrl":"https://doi.org/10.1109/TDC.1999.755377","url":null,"abstract":"This paper discusses power transmission planning under deregulation and presents the concept of market-based transmission planning. Requirements of the analytical tools to perform market based planning and simulations are addressed and examples are used to illustrate the concept.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116984183","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}
引用次数: 105
Methods of multicriteria decision making in fuzzy environment and their applications to transmission and distribution problems 模糊环境下多准则决策方法及其在输配电问题中的应用
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.756146
P. Ekel, L. Terra, M.F.D. Junges
{"title":"Methods of multicriteria decision making in fuzzy environment and their applications to transmission and distribution problems","authors":"P. Ekel, L. Terra, M.F.D. Junges","doi":"10.1109/TDC.1999.756146","DOIUrl":"https://doi.org/10.1109/TDC.1999.756146","url":null,"abstract":"Results of research into the use of fuzzy set theory for multicriteria optimization and decision making in power engineering are presented. The application of multicriteria models to transmission and distribution optimization problems is associated with the need to solve: (1) problems in which solution estimated with a single criterion; and (2) problems which can be solved on the basis of a single criterion, however their unique solutions are not achieved because the uncertainty of information produces decision uncertainty regions. In accordance with this, two classes of models are considered with using the Bellman-Zadeh approach and the technique of fuzzy preference relations to their analysis. Advantages opened up by their application are discussed. The results are of a universal character, have found applications, and are illustrated by considering problems of power and energy shortage allocation and substation planning.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115015346","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}
引用次数: 7
Rating of cables in a nonuniform thermal environment 非均匀热环境下电缆的额定值
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.755321
G. Anders, J. Braun, M. Vainberg, S. Rizzetto, H. Brakelmann
{"title":"Rating of cables in a nonuniform thermal environment","authors":"G. Anders, J. Braun, M. Vainberg, S. Rizzetto, H. Brakelmann","doi":"10.1109/TDC.1999.755321","DOIUrl":"https://doi.org/10.1109/TDC.1999.755321","url":null,"abstract":"When cables cross external heat sources or cross the areas of high thermal resistivity, the conductor temperature will be higher than the values attained outside of the unfavourable area. For perpendicular and oblique crossings as well as street crossings, these effects are usually ignored for distribution circuits, whereas for transmission cables, corrective actions in physical installation condition are sometimes taken. Almost never are analytical solutions used to determine the effect of external heat sources and high thermal resistivity regions on the ampacity of the rated cable. The main reason no computations are performed is an absence of either derating formulae or derating tables (curves) and nor the lack of a need. To fill this gap, analytical solutions for the computation of the derating factors have been developed and sample computational results are presented in this paper. An alternative approach to address the issue of higher operating temperatures is to design and install dynamic feeder rating systems. This topic is also discussed in the paper.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114495200","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}
引用次数: 5
Harmonic balance based bifurcation analysis of three-phase ferroresonance with full scale experimental validation 基于谐波平衡的三相铁磁谐振分岔分析及全尺寸实验验证
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.756147
T. van Craenenbroeck, D. van Dommelen, C. Stuckens, N. Janssens, P. Monfils
{"title":"Harmonic balance based bifurcation analysis of three-phase ferroresonance with full scale experimental validation","authors":"T. van Craenenbroeck, D. van Dommelen, C. Stuckens, N. Janssens, P. Monfils","doi":"10.1109/TDC.1999.756147","DOIUrl":"https://doi.org/10.1109/TDC.1999.756147","url":null,"abstract":"The determination of ferroresonant oscillations in circuits with voltage transformers is a highly nonlinear problem due to the possible core saturation. It is achieved with an algorithm based upon the harmonic balance method in the frequency domain. Advantages over a time domain description are discussed. Branches of solutions in relevant parameter planes can be continued beyond bifurcation points and lead to a better understanding of the stability domains of the periodic ferroresonant oscillations. The method has been extended to the study of quasi-periodic oscillations by approximation models. The theoretical principles are validated on a full scale three-phase 15 kV configuration with ungrounded neutral, in which fundamental, subharmonic and quasi-periodic oscillations are initiated by controlled current pulse injections. Experimental stability limits have been determined and yielded good agreement with the theoretical ones. The limit value of the damping resistor in the delta-connected tertiary windings of the transformers is determined by the presented method.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123519026","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}
引用次数: 6
A simulated annealing algorithm for fuzzy unit commitment problem 模糊机组承诺问题的模拟退火算法
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.755330
A. Mantawy, Y. Abdel-Magid, M. A. Abido
{"title":"A simulated annealing algorithm for fuzzy unit commitment problem","authors":"A. Mantawy, Y. Abdel-Magid, M. A. Abido","doi":"10.1109/TDC.1999.755330","DOIUrl":"https://doi.org/10.1109/TDC.1999.755330","url":null,"abstract":"This paper presents a new algorithm based on integrating simulated annealing and fuzzy logic methods to solve the unit commitment problem. The uncertainties in the load demand and the spinning reserve constraints are formulated in a fuzzy logic frame. The simulated annealing is used to solve the combinatorial part of the unit commitment problem, while the nonlinear part of the problem is solved via a quadratic programming routine. A simple cooling schedule has been implemented to apply the simulated annealing test in the algorithm. Numerical results show the superiority of the solutions obtained compared to the classical methods and the simulated annealing method as individual.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116481615","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}
引用次数: 12
A new method of network reconfiguration for service restoration in shipboard power systems 舰船电力系统业务恢复网络重构新方法
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.756129
K. Butler, N. Sarma, V. Prasad
{"title":"A new method of network reconfiguration for service restoration in shipboard power systems","authors":"K. Butler, N. Sarma, V. Prasad","doi":"10.1109/TDC.1999.756129","DOIUrl":"https://doi.org/10.1109/TDC.1999.756129","url":null,"abstract":"The electric power systems of ships supply energy to sophisticated systems for weapons, communications, navigation and operation. Circuit breakers (CBs) and fuses are provided at different locations in order to remove faulted loads, generators or distribution systems from unfaulted portions of the system. These faults could be due to material causalities of individual loads or cables or due to widespread system fault due to battle damage. Because of the faults and after isolating the fault, there are unfaulted sections which are left without supply. It is required to quickly restore supply to these unfaulted sections of the shipboard power systems. This paper presents a new method to reconfigure the network to restore service to unfaulted sections of the system. The problem is formulated as a modification of the fixed charge network flow problem. The proposed method is illustrated using different case studies.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134023503","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}
引用次数: 36
Analyzing the value of equipment testing in a power distribution system 分析配电系统设备测试的价值
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.756118
R. Fancher, A. Hulse
{"title":"Analyzing the value of equipment testing in a power distribution system","authors":"R. Fancher, A. Hulse","doi":"10.1109/TDC.1999.756118","DOIUrl":"https://doi.org/10.1109/TDC.1999.756118","url":null,"abstract":"This paper explores the concepts of understanding the economic value gained from applying nondestructive testing techniques to common power distribution equipment. The concept is illustrated using a case study example of testing underground getaway cables at distribution voltage substations. Using a Markov chain model, the authors quantitatively evaluate the impacts of cable failure (both direct cost and outage impacts), the likelihood of cable failure, the results of cable testing (including both false negatives and false positives) and the costs of testing. Using this information, the paper shows how the accuracy of the test can influence when testing is a worthwhile investment and, conversely, when the costs of testing outweigh the actual benefits that are gained.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133952496","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}
引用次数: 0
A new method for measuring power system frequency 一种测量电力系统频率的新方法
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.755385
T. Sezi
{"title":"A new method for measuring power system frequency","authors":"T. Sezi","doi":"10.1109/TDC.1999.755385","DOIUrl":"https://doi.org/10.1109/TDC.1999.755385","url":null,"abstract":"The algorithms of numerical protective relays are very sensitive to variations in the power system frequency during operation. Even slight changes of the power frequency can lead to large calculation errors in the values for impedances, the power factor, etc. Implementing an adaptive sampling rate requires knowing the actual system frequency at all times with high accuracy. A new frequency measurement method has been successfully implemented. Since the method is not dependent upon zero-crossings of the measured current, it can calculate the frequency after every sample. In addition, the necessary signal-window is approximately 3 cycles, which means that the calculation is faster than all classical methods. The new method has made possible the development of a full-featured generator protection relay that can operate over a frequency range of 15 Hz-70 Hz. The accuracy of the frequency calculation is better then 10 mHz for a nominal frequency of 60 Hz.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131554927","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}
引用次数: 34
Simplified simulation method for partial discharge phenomena in GIS GIS中局部放电现象的简化模拟方法
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.756109
H. Imagawa, K. Emoto, H. Koyama, H. Murase, T. Sakakibara, S. Maruyama, R. Tsuge
{"title":"Simplified simulation method for partial discharge phenomena in GIS","authors":"H. Imagawa, K. Emoto, H. Koyama, H. Murase, T. Sakakibara, S. Maruyama, R. Tsuge","doi":"10.1109/TDC.1999.756109","DOIUrl":"https://doi.org/10.1109/TDC.1999.756109","url":null,"abstract":"In recent years, partial discharge (PD) measurements in the UHF range have been attracting great attention as an excellent GIS insulation diagnostic method. From the viewpoint of practical application, the arrangement of UHF sensors and their measuring frequency range are very important. Focusing on the TEM mode of PD pulse propagation, the authors investigated damping characteristics for each GIS component. On the basis of the results, they developed a new program for a microcomputer which simulates the damping of PD pulses in GIS. In this program, data on the propagation characteristics of each GIS component are assembled and combined according to the propagation route of PD pulses in the GIS. To verify the accuracy of this program, they carried out an on-site test in an underground GIS substation using the pulse injection method. From the test results, the combined damping effect of GIS components was clarified and some correction rules for this program were established.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128947436","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}
引用次数: 2
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