{"title":"An abductive fuzzy knowledge based system for fault diagnosis in a power system","authors":"M.Y. Park, M. Lefley, B. Ramsay, I. Moyes","doi":"10.1109/ICPST.2000.900081","DOIUrl":"https://doi.org/10.1109/ICPST.2000.900081","url":null,"abstract":"This paper presents the design and evaluation of a novel, Al (artificial intelligence) based alarm processing and fault diagnosis system, for a 132 kV/12 bus-16 line sample power system. The work has been conducted in conjunction with Scottish Hydro Electric PLC. The fault diagnosis system is based on a hybrid object-oriented AI technique. The method developed utilises abductive inference. This technique is demonstrated to realise some improvements when compared with fuzzy logic and takes into account the current practical limitations in the design. The method is based on processing SCADA (supervisory control and data acquisition) messages, extending the arrangement of the knowledge acquisition process and applicability of circuit breakers and relays. The potential benefits and implications of adopting such an abductive fuzzy knowledge based system are demonstrated in this research, and include a user friendly inference engine, adaptability, and KBS update.","PeriodicalId":330989,"journal":{"name":"PowerCon 2000. 2000 International Conference on Power System Technology. Proceedings (Cat. No.00EX409)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117121191","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}
{"title":"New method of harmonic analysis of power electronic converter and cycloconverter for high-power industrial drives","authors":"J. Jianguo, X. Weimin","doi":"10.1109/ICPST.2000.898216","DOIUrl":"https://doi.org/10.1109/ICPST.2000.898216","url":null,"abstract":"Large converters and cycloconverters in applications of high-power industrial drives are the main harmonic sources in power systems. A new method of harmonic analysis for converters and cycloconverters is proposed in this paper. The theoretical fundamentals of this method are that the operation processes of converter and cycloconverter feature the characteristics of discrete sample and modulation, and also are cycling, and that the dynamics of converter and cycloconverter can be represented by several eigen current equations. Recording the sampling data at switching points, computing the harmonics of eigen current equations, and synthesizing those harmonics, the harmonics or side harmonics of the integrated system containing AC and DC sides, or AC network side and AC motor side can be obtained. The suggested method has the advantages of less memory capacity needed, fast computation and high accuracy. This method is very useful and effective in estimating the harmonic sources, predicting the harmonic flow and propagation and researching the harmonic suppression and elimination.","PeriodicalId":330989,"journal":{"name":"PowerCon 2000. 2000 International Conference on Power System Technology. Proceedings (Cat. No.00EX409)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125780550","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}
{"title":"Load models and their application in the design of loosely coupled inductive power transfer systems","authors":"Chwei-Sen Wang, O. Stielau, G. Covic","doi":"10.1109/ICPST.2000.897166","DOIUrl":"https://doi.org/10.1109/ICPST.2000.897166","url":null,"abstract":"Load models are developed as a design tool for loosely coupled inductive power transfer systems. The models are used to investigate the sensitivity of these systems to variations in operational frequency and load. The results of the investigation can then be used to determine the power transfer capability and controllability of the system.","PeriodicalId":330989,"journal":{"name":"PowerCon 2000. 2000 International Conference on Power System Technology. Proceedings (Cat. No.00EX409)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126086687","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}
{"title":"Field experience with the new platform-mounted DVR/sup TM/","authors":"N. Woodley, A. Sundaram, T. Holden, T. Einarson","doi":"10.1109/ICPST.2000.898161","DOIUrl":"https://doi.org/10.1109/ICPST.2000.898161","url":null,"abstract":"Installation of the world's first platform-mounted dynamic voltage restorer (DVR/sup TM/ PM) prototype on a major North American utility system to protect a critical customer load from power system voltage disturbances ushers in a new era of power quality solutions available for overhead distribution systems on the utility side of the revenue billing meter. The DVR/sup TM/ PM built by Siemens for the Electric Power Research Institute (EPRI) was installed at the Northern Lights Community College in Dawson Creek, B.C. where it provides protection for 600 kVA of load from disturbances coming from the utility 25 kV distribution system that serves the college. The early success of the DVR/sup TM/ PM demonstration in Canada has implications for the Australian market where in excess of 90% of the 11 and 22 kV networks are bare conductor overhead lines. As a consequence, customers are exposed to the voltage sags that the DVR/sup TM/ is designed to mitigate. Smaller critical customer loads can now be offered improved power quality network solutions on the 11 or 22 kV distribution systems that were not previously available. In Victoria alone, there are approximately 14,000 customers (or groups of commercial/industrial customers) who would benefit from such a network solution. This paper describes the DVR/sup TM/ PM and the demonstration project installation, commissioning, and field operation to date. Future equipment designs are also discussed.","PeriodicalId":330989,"journal":{"name":"PowerCon 2000. 2000 International Conference on Power System Technology. Proceedings (Cat. No.00EX409)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126307070","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}
Y.P. Wang, D. Hur, H. Chung, N. Watson, J. Arrillaga, S. Matair
{"title":"Design of an optimal PID controller in AC-DC power system using modified genetic algorithm","authors":"Y.P. Wang, D. Hur, H. Chung, N. Watson, J. Arrillaga, S. Matair","doi":"10.1109/ICPST.2000.898180","DOIUrl":"https://doi.org/10.1109/ICPST.2000.898180","url":null,"abstract":"HVDC power transmission systems can overcome some limitations inherent with AC power transmission systems such as transmission over long distance and transmission with cable. One aspect of importance is the improvement in stability achieved with AC-DC power transmission. In this paper a methodology for the optimal proportional integral derivative (PID) controller design using the modified genetic algorithm (MGA) is proposed to improve the transient stability of AC-DC power systems after faults. This study consists of the formulation of load-flow calculation, basic controls on HVDC transmission system, mathematical model selection for stability analysis, and supplementary signal control by an optimal PID controller using the MGA. The proposed method is verified using computer simulation. The results show the application of the MGA-PID controller in AC-DC power systems has improved the transient stability. The PID controller design using MGA method has been shown to be advantageous when applied for the AC-DC power systems.","PeriodicalId":330989,"journal":{"name":"PowerCon 2000. 2000 International Conference on Power System Technology. Proceedings (Cat. No.00EX409)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127417865","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}
{"title":"Characteristics and location of the quality control center using three-phase four-wire AC system","authors":"T. Ise, Y. Hayashi, K. Tsuji","doi":"10.1109/ICPST.2000.897101","DOIUrl":"https://doi.org/10.1109/ICPST.2000.897101","url":null,"abstract":"Unbundled power quality service is paid much attention under the circumstances of deregulation and diversification of needs of customers for quality and price of electric power. Characteristics of one possible and simple circuit, which enables us to deliver different power quality level to single-phase loads, are presented. The system can supply three levels of power quality to single-phase loads by use of three-phase four-wire AC system, one inverter and a battery. Finally, for a practical usage of the proposed system, location of the system at some places such as factories and individual houses is presented.","PeriodicalId":330989,"journal":{"name":"PowerCon 2000. 2000 International Conference on Power System Technology. Proceedings (Cat. No.00EX409)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127747182","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}
{"title":"Predictability of back propagation and discrete Hopfield neural networks in harmonic compensation systems","authors":"H.C. Lin, C. Lee","doi":"10.1109/ICPST.2000.900080","DOIUrl":"https://doi.org/10.1109/ICPST.2000.900080","url":null,"abstract":"A quality tool for predicting control signals is indispensable for effective harmonic compensation in AC power distribution systems. Notably in the literature, either back propagation (BP) or Hopfield neural networks (HNN) has claimed to provide quality control signals to achieve the desired harmonic reduction results. This paper evaluates the predictability of BP and HNN in terms of convergence behaviour and learning capability, as applied to the reduction of load generated current harmonics in a variable speed DC drive. Using the same real current harmonic data, our test results confirm that BP has a larger dynamic harmonic range whereas discrete HNN, due to its interconnection structure, needs larger size of memory map.","PeriodicalId":330989,"journal":{"name":"PowerCon 2000. 2000 International Conference on Power System Technology. Proceedings (Cat. No.00EX409)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123081214","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}
M. Suojanen, J. Vehmaskoski, S. Kuusiluoma, P. Trygg, L. Korpinen
{"title":"Effect of spruce forest on electric fields caused by 400 kV transmission lines","authors":"M. Suojanen, J. Vehmaskoski, S. Kuusiluoma, P. Trygg, L. Korpinen","doi":"10.1109/ICPST.2000.898174","DOIUrl":"https://doi.org/10.1109/ICPST.2000.898174","url":null,"abstract":"In a previous study on electric fields near 400 kV transmission lines it was noticed that the differences in calculations and measurements were caused by vegetation dampening the field. This caused the need for further investigation and dampening measurements. The measurement results of electric fields near spruce trees of different sizes show that spruce trees dampen electric fields. Thus spruce forest and trees might be a possibility to reduce electric fields from transmission lines. The aim of this study is to investigate the effect of spruces and spruce forest on electric fields of 400 kV transmission lines.","PeriodicalId":330989,"journal":{"name":"PowerCon 2000. 2000 International Conference on Power System Technology. Proceedings (Cat. No.00EX409)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123110181","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}
{"title":"Improving transient stability limits by damping accelerating energy","authors":"W.R. Lachs, D. Sutanto","doi":"10.1109/ICPST.2000.900068","DOIUrl":"https://doi.org/10.1109/ICPST.2000.900068","url":null,"abstract":"An analysis of the post-disturbance phenomena leading to transient instability has been prompted because of the small magnitude of primary accelerating energy produced by generators near the fault. This has shown that the accelerating energy is greatly multiplied as it flows through the network, past successive load substations. The analysis has shown that progressing with the outflow of accelerating energy, there is simultaneous a wave of raised frequency as well as a wave of lowered voltages. The voltage wave reduces each substation's load magnitude just as the accelerating energy passes and so causes its amplification. This has shown that a pattern of voltage and frequency changes at each substation can not only identify but also actuate measures for the control of transient stability. A study has demonstrated that local control of the switching of shunt capacitors and reactors at each substation can avert transient instability. Not only is this a low cost approach, but it provides an adaptive arrangement that can respond to disturbances anywhere on the transmission grid to prevent its disruption by transient instability. Compared to the use of braking resistors, a fail-safe arrangement is offered which is also effective in damping oscillations after noncritical disturbances.","PeriodicalId":330989,"journal":{"name":"PowerCon 2000. 2000 International Conference on Power System Technology. Proceedings (Cat. No.00EX409)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131235813","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}
{"title":"Performance evaluation of series impedance insulation used as earthing system safety mitigation measures","authors":"W. Carman, D. Woodhouse","doi":"10.1109/ICPST.2000.898166","DOIUrl":"https://doi.org/10.1109/ICPST.2000.898166","url":null,"abstract":"High resistivity surfacing materials such as crushed rock and bitumen, are often used to limit electric shock hazards for utility operators and maintenance staff, as well as the public. Certain safety codes also make allowance for the likelihood that utility operators and the public will be wearing footwear. This paper evaluates the performance of series impedance insulation used as earthing system safety mitigation measures. Data gathered as part of a detailed R&D programme, undertaken by the Safearth Engineered Solution team within Energy Australia, is discussed with respect to the performance of surface layers and footwear, and their effect upon electrical installation safety profiles under earth fault conditions. Guidelines for improved performance specifications are developed based upon test results and application requirements.","PeriodicalId":330989,"journal":{"name":"PowerCon 2000. 2000 International Conference on Power System Technology. Proceedings (Cat. No.00EX409)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122400891","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}