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Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)最新文献

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Coherency identification using growing self organizing feature maps [power system stability] 基于增长自组织特征映射的相干识别[电力系统稳定性]
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.705456
T.N. Nababhushana, K.T. Veeramanju, Shivanna
{"title":"Coherency identification using growing self organizing feature maps [power system stability]","authors":"T.N. Nababhushana, K.T. Veeramanju, Shivanna","doi":"10.1109/EMPD.1998.705456","DOIUrl":"https://doi.org/10.1109/EMPD.1998.705456","url":null,"abstract":"Stable operation of a power system following a disturbance is very important from the point of view of reliability. For this purpose, online assessment is needed to evaluate the impacted system components in a short time. Fast evaluation of a disturbance impact requires the formulation of dynamic equivalence of external systems. On the other hand, preventive measures for stability enhancement requires a priori knowledge of the components that will be affected by the disturbance. This paper presents the identification of coherent generators in power systems using an unsupervised learning neural network called a \"growing self-organizing feature map\" which dynamically generates the network architecture. The data for the neural network has been obtained from the simulation of a 1000 bus, 62 generator system.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114261454","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: 26
Bond graph simulations of electrical systems 电气系统键合图仿真
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.705489
Y. Wong, A. Rad
{"title":"Bond graph simulations of electrical systems","authors":"Y. Wong, A. Rad","doi":"10.1109/EMPD.1998.705489","DOIUrl":"https://doi.org/10.1109/EMPD.1998.705489","url":null,"abstract":"Bond graphs provide a useful notation for the purpose of modeling physical systems. They are developed as a unified theory to simulate and analyse engineering systems and are shown, by simulation studies, to be superior to other simulation techniques in term of robustness. The bond graph language supplies a modeling approach that is concise, clear and broadly applicable. This paper describes a user-friendly computer package for the application of bond graph algorithms to the simulation of power systems. The software package is able to simulate an electrical system and display a bond graph model with power flow directions, causality and time responses.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131853849","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: 13
Increasing voltage stability line limits 增加电压稳定线限制
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.705530
W.R. Lachs, D. Sutanto
{"title":"Increasing voltage stability line limits","authors":"W.R. Lachs, D. Sutanto","doi":"10.1109/EMPD.1998.705530","DOIUrl":"https://doi.org/10.1109/EMPD.1998.705530","url":null,"abstract":"Constraining the loadings of transmission lines on interconnected grids has increased the operating costs of power systems and yet has not prevented collapses following disturbances that have disrupted system voltage stability. An understanding of the post-disturbance phenomena gained by simulation, has shown that during the initial slow phase, rotating units hold high levels of reactive power reserves which can sustain high transmission line loadings. Automatic measures that respond within the first phase would eliminate the need to constrain transmission line loadings by preventing the second disruptive phase, when reactive power reserves suddenly vanish. This is when voltage stability is lost and the power system collapses.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130266697","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: 1
The application of digital relay in fault location identification for cable in steel-pipe 数字继电器在钢管电缆故障定位识别中的应用
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.705550
J. Gu, Sun-Li Yu, Weijen Lee
{"title":"The application of digital relay in fault location identification for cable in steel-pipe","authors":"J. Gu, Sun-Li Yu, Weijen Lee","doi":"10.1109/EMPD.1998.705550","DOIUrl":"https://doi.org/10.1109/EMPD.1998.705550","url":null,"abstract":"The Electromagnetic Transients Program (EMTP) after minor adaptation is utilized to simulate the grounded fault of a cable in a steel-pipe. The zero sequence impedance became nonlinear during the fault period, because the zero sequence current in a steel-pipe induced a magnetic saturation effect. Consequently, the zone protection of a cable in a steel-pipe has a serious error if a traditional distance relay is used. To correct this possible malfunction a novel idea using the proposed digital relay is presented. The physical zero sequence impedance will dynamically be modified according to the zero sequence current in case of a grounded fault. With such real cable data, an accurate fault location of cable in a steel-pipe is accordingly estimated.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130342105","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: 1
Impact of time to flashover of gapped silicon carbide arrester on insulation co ordination of substation. A model study 间隙碳化硅避雷器闪络时间对变电站绝缘协调的影响。模型研究
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.702720
N. Chatterjee
{"title":"Impact of time to flashover of gapped silicon carbide arrester on insulation co ordination of substation. A model study","authors":"N. Chatterjee","doi":"10.1109/EMPD.1998.702720","DOIUrl":"https://doi.org/10.1109/EMPD.1998.702720","url":null,"abstract":"Presently gapped silicon carbide arresters are rarely purchased for the protection of substation equipment and they are gradually replaced by metal oxide arresters. But gapped arresters form the bulk of the protection equipment and have been in use for more than 10 years. These arresters have undergone extensive deterioration and often are reported to have failed. The deterioration of their components, such as the electrodes forming the gaps, causes a significant change in their breakdown characteristics. A TNA model has been used to study the effect of change in the breakdown time on the voltage rise at the transformer end of a 132 kV substation under impulse voltage. A rise of 35% in the potential over the BIL at the transformer end is noticed when an impulse strikes the incoming line of a substation and when the breakdown time of the spark gap changes from 0.6 /spl mu/S to 4.0 /spl mu/S. The model simulation has been supported by computer simulation in Pspice.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"183 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121033021","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
Refined genetic algorithm for minimum-loss reconfiguration of electrical distribution network 配电网最小损耗重构的改进遗传算法
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.702711
Jizhong Zhu, C. S. Chang
{"title":"Refined genetic algorithm for minimum-loss reconfiguration of electrical distribution network","authors":"Jizhong Zhu, C. S. Chang","doi":"10.1109/EMPD.1998.702711","DOIUrl":"https://doi.org/10.1109/EMPD.1998.702711","url":null,"abstract":"This paper proposes a model of distribution network reconfiguration (DNRC) to minimize the system power loss. A refined genetic algorithm (GA) is set up, in which some improvements are made on chromosome coding, fitness function and mutation pattern. As a result, premature convergence is avoided. The proposed approach is tested on 16 bus and 33-bus distribution networks. Study results are given in the paper.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128048686","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: 11
Maximizing radial voltage stability and load balancing via loss minimization in distribution networks 在配电网中通过损耗最小化最大化径向电压稳定性和负载平衡
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.705437
M. Kashem, Mahmoud Moghavvemi
{"title":"Maximizing radial voltage stability and load balancing via loss minimization in distribution networks","authors":"M. Kashem, Mahmoud Moghavvemi","doi":"10.1109/EMPD.1998.705437","DOIUrl":"https://doi.org/10.1109/EMPD.1998.705437","url":null,"abstract":"Distribution networks have to be operated under minimized loss conditions due to economic reasons. Besides economic considerations, a reconfigured distribution network operating at a minimum loss condition has some added advantages in the form of increased voltage stability and load balancing. This paper presents the relationship between voltage stability and loss minimization in which it can be shown that voltage stability is maximized when power losses are minimized in the networks. A relationship between load balancing and loss minimization is also presented. A new load balancing index is proposed and applied to a distribution network to investigate the improvement in load balancing after network reconfiguration. Test results indicate that improvement in voltage stability and load balancing can be achieved by network reconfiguration.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125607238","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: 29
Nonlinear field weakening controller of a separately excited DC motor 分励直流电动机非线性弱磁控制
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.702745
LuoFang Lin, L. Zong, D. Tien
{"title":"Nonlinear field weakening controller of a separately excited DC motor","authors":"LuoFang Lin, L. Zong, D. Tien","doi":"10.1109/EMPD.1998.702745","DOIUrl":"https://doi.org/10.1109/EMPD.1998.702745","url":null,"abstract":"A new nonlinear field weakening controller has been proposed for speed tracking control of a separately excited DC motor drive. Input output feedback linearization technique is used to handle the nonlinearities in the field weakening operation. The motor is controlled by actuating two inputs of armature voltage and field voltage to achieve high dynamic control performance. Simulation results using the proposed nonlinear controller and traditional PI controller are presented.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121593378","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
Lightning induced surges on an unenergized test overhead telecommunication subscriber line 未通电测试架空电信用户线路上的雷击感应浪涌
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.705548
M. Sorwar, H. Ahmad, M.M. Ali, A. Ramli, N. Othman, P. Yahya
{"title":"Lightning induced surges on an unenergized test overhead telecommunication subscriber line","authors":"M. Sorwar, H. Ahmad, M.M. Ali, A. Ramli, N. Othman, P. Yahya","doi":"10.1109/EMPD.1998.705548","DOIUrl":"https://doi.org/10.1109/EMPD.1998.705548","url":null,"abstract":"Voltages induced on a test unenergized 1.8 km straight overhead telecommunication subscriber line by nearby lightning return stroke to ground is presented by solving transmission line coupling equations using time domain approach in combination with the numerical calculation of horizontal and vertical electric fields from return stroke current as inducing source. Both horizontal and vertical electric fields have a significant effect on induced voltages. The effect of the line length and line height on induced voltages is illustrated in this paper. A comparison between numerically calculated data and experimentally recorded data is also made in this paper. The ground conductivity is considered infinite and a triangular current pulse moving from ground to cloud through a 4 km upright vertical channel is taken as channel current. It is found that the calculated results are in reasonably good agreement with experimental results.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116150395","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
Parameter estimation from power system disturbance measurements 电力系统扰动测量参数估计
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.702768
I. Hiskens, Alexander Koeman
{"title":"Parameter estimation from power system disturbance measurements","authors":"I. Hiskens, Alexander Koeman","doi":"10.1109/EMPD.1998.702768","DOIUrl":"https://doi.org/10.1109/EMPD.1998.702768","url":null,"abstract":"Estimation of parameters from power system measurements is complicated by the nonlinear nature of system dynamics. The paper proposes a Gauss-Newton approach to computing model parameters that give the best fit between measurements and the model response. This approach involves trajectory sensitivities, i.e., the sensitivity of the model trajectory to small changes in parameters. An overview of trajectory sensitivity analysis is provided. A small example, which exhibits both soft and hard nonlinearities, is used to illustrate the estimation algorithm.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126808265","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: 24
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