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

{"title":"The Nature Of The Power System Stability Surface","authors":"B. Nicholson, R. Dunn, K. Chan, A. R. Daniels","doi":"10.1109/EMPD.1998.702522","DOIUrl":"https://doi.org/10.1109/EMPD.1998.702522","url":null,"abstract":"An increasing pressure on power system operators to operate their system closer to stability limits, together with continual advances in affordable computing power has motivated research into tools capable of automatically optimising ower system stability and economy. In .,!er to design any o timisation strategy it is essential to posses a thorough ungrstanding of the nature of the optimisation surface. In this light, this paper describes research, based upon an exhaustive analysis of the stability terrain of a small power system, which provides an essential insight into the system wide nature of power system stability. The paper demonstrates that even a small power system exhibits characteristics such as non-linearities and discontinuities, and includes many stability local minima, all of which are important considerations in the selection of suitable optimisation algorithms. The paper argues that, having demonstrated certain characteristics for a small power system, their are no logical reasons why the same characteristics should not be expected in larger and more complex systems, and thus strongly recommends that any algorithms for ower s stem stability optimisation should be accordingly gsignedl","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126328931","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 Concept Vacuum Circuit Breaker 7.2kv-36kv Smart VCB Type Vz -","authors":"K. Matsuo, K. Fujii, M. Taniguchi, M. Homma, T. Wakabayashi, I. Ohshirna","doi":"10.1109/EMPD.1998.702529","DOIUrl":"https://doi.org/10.1109/EMPD.1998.702529","url":null,"abstract":"Toshiba has developed a hew concept vacuum circuit breaker, SMART VCB, ranging from 7.2kV to 36kV, which integrate a new vacuum interrupter, an operating mechanism and an insulation structure. The device features a new vacuum arc control technology, SADE (Self-Arc-Diffusion-by-Electrode), which doubles the high current interruption capability. The operating mechanism features low driving energy, low maintenance, compactness and tight weight, which produces a highly reliable VCB for its entire service life. The insulation structure features high mechanical strength and insulation performance by using a molded insulator. This new concept VCB is easily adapted to metal clad switchgear, which realize a modern, compact, light weight, safety metal clad switchgear toward the 215' century.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115434764","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":"A New Technique For Applying Genetic Algorithms To Power System Security Optimisation Problems","authors":"B. Nicholson, R. Dunn, K. Chan, A. R. Daniels","doi":"10.1109/EMPD.1998.702528","DOIUrl":"https://doi.org/10.1109/EMPD.1998.702528","url":null,"abstract":"This aper presents a new technique for harnessing the power of Anetic Algorithms, (GA), for the optimisation of power system transient security and economy. The paper summarises the 'classical' application of GAS to the problem, and discusses a number of factors which contribute to the poor performance of the resulting optimiser, both in terms of solution quality and computational load. The main concerns raised are then addressed through a novel, mathematically justified, encoding strategy based on the implicit inclusion of important constraint equations, together with eqlicit adherence to the Building Block Theorem which has been previously offered as an important pre-requisite for the convergence of GAs[l]. One of the most important properties of the new technique is that it achieves its high performance without the need for any assumptions or ap roximations, thus guaranteeing the quality of the final sofkon. Indeed it is claimed that the reduced computational effort and improved search strategy results in the location of better solutions than those obtainable using any existing technique. However, the design of the algorithm also provides a number of routes by which auxiliary information can be incorporated at the core of the optimisation process to achieve faster convergence at the possible expense of solution quality for liations where execution time is of prime importance. %st the algorithm has been designed for fast execution on a single processor machine, significant care has been exerted to ensure that parallel implementation can be easily achieved using either distributed processing on a cluster of single-processor workstations, or an appropriate multiprocessor machine. The paper concludes by presenting comparative results for a classical GA and one based on the new technique, both applied to a small power system for which com lete knowledge of the 'best' solutions is available. &ese results clearly demonstrate the advantages of the presented method.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124220105","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":"Simulated Extensive Optimal Power System Operations Via Effective Optimization Techniques","authors":"Yu‐Chi Wu, A. Debs, C. Hansen","doi":"10.1109/EMPD.1998.702521","DOIUrl":"https://doi.org/10.1109/EMPD.1998.702521","url":null,"abstract":"This paper discusses the issues related to multiarea operation of power systems, which become important nowadays to the restructured electric utilities. An effective interior-point-method-based optimal power flow (IPMOPF) [1,2,3] was incorporated into an operator training simulator (OTS) to present different performance results of multi-area operations. A realistic power system network model is used for testing and verification purposes. The simulation results show that substantial economic savings can be achieved through multi-area optimization operations.","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":"1998-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121068338","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":"A Modern Distribution Automation Laboratory","authors":"M. Kauppinen, P. Jdrventausta, M. Pitkdnen, J. Partanen, M. Kdrenlampi, P. Verho","doi":"10.1109/EMPD.1998.702532","DOIUrl":"https://doi.org/10.1109/EMPD.1998.702532","url":null,"abstract":"","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121983492","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":"On-line Tuning Of A Fuzzy Power System Stabiliser","authors":"N. Hosseinzadeh, A. Kalarn","doi":"10.1109/EMPD.1998.702526","DOIUrl":"https://doi.org/10.1109/EMPD.1998.702526","url":null,"abstract":"A fuzzy logic power system stabiliser (FPSS) has been developed using speed deviation and accelerating power as the controller input variables. The inference mechanism of the fuzzy logic controller is represented by a (7 ~'7) decision table, i.e. 49 IF-THEN rules. The design of the FPSS is based on the linguistic rules which are available from experts, hence, there is no need for a mathematical model of the plant for the design procedure. Two scaling parameters have been introduced to tune the FPSS. These scaling parameters are the outputs of another fuzzy logic system which gets the operating conditions of the power system as inputs. This mechanism of tuning the FPSS, makes the FPSS adaptive to changes in the operating conditions. Therefore, the degradation of the system response, under a wide range of operating conditions, is less compared to the system response with a fixed-parameter FPSS and a conventional (linear) power system stabiliser (CPSS). The tuned stabiliser has been tested by performing nonlinear simulations using a synchronous machine-infinite bus model. The responses are compared with the fixed-parameters FPSS and a CPSS. It is shown that the tuned FPSS is superior to both fixed-parameters FPSS and CPSS.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115128646","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":"Recognising nonlinear interactions in power systems","authors":"S. Chakravarthy","doi":"10.1109/EMPD.1998.705412","DOIUrl":"https://doi.org/10.1109/EMPD.1998.705412","url":null,"abstract":"The availability of high speed data acquisition systems (DAS) allows voltage and current waveforms to be captured on-line as a time series. The voltage and current oscillations, of varying periodicity, arise out of nonlinear interactions in power systems. Conventional spectral analysis is based on the assumption that the time-series data is Gaussian. This assumption, as will be shown, cannot be universally applied. Higher-order spectral (HOS) analysis, on the other hand, offers a method to recognise these interactions in a power system when the waveforms are non-Gaussian. The time series data, to be analysed in this paper, in particular, is taken from a system of well known dynamical equations in the power system. We demonstrate, by using HOS, the extent of joint dependence of the spectral components.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"42 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":"124387798","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":"Overview of diagnostic and condition monitoring techniques for in-service power apparatus","authors":"S. Birlasekaran, S. Choi, A. Liew","doi":"10.1109/EMPD.1998.702769","DOIUrl":"https://doi.org/10.1109/EMPD.1998.702769","url":null,"abstract":"Power apparatus condition monitoring, continually or at intervals, is important for any power transmission and distribution utility to supply energy with an acceptable level of reliability, quality and safety. Based on the information, critical and cost effective maintenance and repair decisions could be taken to reduce power failures and the resulting damage to infrastructure. The insulation material used in such systems degrades due to thermal, oxidative, hydrolytic, electrical and mechanical operating conditions. Also, a significant number of power apparatus in any power grid are currently operating beyond their design life. Operating health condition and remaining life are diagnosed by various offline and online monitoring techniques with expert systems. In this paper, the current status of R&D work in this field and the readily available commercial instrumentation based on electrical, chemical and mechanical methods are presented.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"42 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":"127448237","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":"Methods for earth fault identification and distance estimation in a compensated medium voltage distribution network","authors":"A. Nikander, P. Jarventausta","doi":"10.1109/EMPD.1998.702754","DOIUrl":"https://doi.org/10.1109/EMPD.1998.702754","url":null,"abstract":"This paper introduces methods for the indication and location of earth faults in a compensated medium voltage distribution network. Algorithms for determining the total phase-to-earth admittance and unbalance of the medium voltage distribution system and each of its MV feeders are presented. Information on earth fault distance can be obtained by rearranging the faulted feeder, normally operated radially, into a closed ring over some healthy feeder. The fault distance along both feeders can be determined by using two different values of the zero sequence voltage and corresponding zero sequence currents of the feeders. Two other methods based on reactive and active components of zero sequence currents can also be used. All the methods presented usually require a compensation of earth fault current. Both fault location and determination of these previously mentioned parameters have been tested in the real compensated MV distribution system.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"33 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":"115187183","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":"Coordinated decentralized optimal control of inter-area oscillations in power systems","authors":"T. Lie, G. Li, G. Shrestha, K. Lo","doi":"10.1109/EMPD.1998.705441","DOIUrl":"https://doi.org/10.1109/EMPD.1998.705441","url":null,"abstract":"A linear optimal controller is designed to implement variable series compensation (VSC) in the transmission networks of interconnected power systems. The proposed controller is used to damp inter-area oscillations and enhance power system stability. The effectiveness of the linear optimal controller to properly control such a variable series reactance is demonstrated through mode shapes and digital simulation studies on a two-machine power system. The digital simulation studies are conducted using a PSCAD/EMTDC software package.","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":"116561456","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}