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Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference最新文献

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Transient-based protection as a solution for earth-fault detection in unearthed and compensated neutral medium voltage distribution networks 基于暂态保护的接地故障检测解决方案
Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference Pub Date : 2010-06-16 DOI: 10.1109/PQ.2010.5549993
M. F. Abdel-Fattah, M. Lehtonen
{"title":"Transient-based protection as a solution for earth-fault detection in unearthed and compensated neutral medium voltage distribution networks","authors":"M. F. Abdel-Fattah, M. Lehtonen","doi":"10.1109/PQ.2010.5549993","DOIUrl":"https://doi.org/10.1109/PQ.2010.5549993","url":null,"abstract":"This paper highlights the earth fault problem in unearthed (isolated) and compensated neutral medium voltage distribution networks and the transient-based protection as a solution. The technique of transient-based analysis will be discussed considering the sampling window, frequency and data updating. The required transient simulation analysis and its validation will be presented. Many important practical investigations will also be discussed such as the required measured quantities, polarity criterion, magnitude criterion and suitable earth-fault indication tools. Finally, some of the developed techniques and algorithms from the previous work in this area will be summarized.","PeriodicalId":356169,"journal":{"name":"Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128855176","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: 8
Renewable electricity generation in Estonia 爱沙尼亚的可再生能源发电
Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference Pub Date : 2010-06-16 DOI: 10.1109/PQ.2010.5550013
T. Tomson
{"title":"Renewable electricity generation in Estonia","authors":"T. Tomson","doi":"10.1109/PQ.2010.5550013","DOIUrl":"https://doi.org/10.1109/PQ.2010.5550013","url":null,"abstract":"The dynamic behaviour of renewable resources - wind and solar radiation - is investigated and discussed in this presentation as it is the most significant factor influencing the reliability and quality of generated “green” electricity. Wind turbine generators are connected to the grid and their performance has to be analyzed when coupled to the grid. Solar electricity in Estonia has up to now been generated autonomously.","PeriodicalId":356169,"journal":{"name":"Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128928095","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
Probabilistic reliability optimization using hybrid genetic algorithms 基于混合遗传算法的概率可靠性优化
Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference Pub Date : 2010-06-16 DOI: 10.1109/PQ.2010.5550003
A. Gaun, G. Rechberger, H. Renner
{"title":"Probabilistic reliability optimization using hybrid genetic algorithms","authors":"A. Gaun, G. Rechberger, H. Renner","doi":"10.1109/PQ.2010.5550003","DOIUrl":"https://doi.org/10.1109/PQ.2010.5550003","url":null,"abstract":"In this paper transmission power system structure optimization is performed via a minimal spanning tree based encoded fuzzy logic self-controlled hybrid genetic algorithm (GA). During the redundancy optimization of the power system network a binary encoded GA is used for a modified transmission network expansion problem, finding the optimal power line type with respect to the net present value (NPV) of minimal investment cost, operating costs and load flow constraints. Each individual is evaluated by a minimal state probability reliability estimation algorithm verifying a certain minimal reliability constraint. A developed improvement algorithm is used for individuals not satisfying a reliability constraint. A recently developed fast reliability calculation algorithm, computing energy not supplied, and the obtained NPV of the transmission network expansion problem are utilized as minimization function. The algorithm is applied to a real world sub transmission system in order to discuss strategies for future system expansions.","PeriodicalId":356169,"journal":{"name":"Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127711632","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: 3
The impact of 50 Hz railroad systems on utility system unbalance 50赫兹铁路系统对公用事业系统不平衡的影响
Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference Pub Date : 2010-06-16 DOI: 10.1109/PQ.2010.5550017
P. Heine, M. Hyvarinen, J. Niskanen, A. Oikarinen, H. Renner, M. Lehtonen
{"title":"The impact of 50 Hz railroad systems on utility system unbalance","authors":"P. Heine, M. Hyvarinen, J. Niskanen, A. Oikarinen, H. Renner, M. Lehtonen","doi":"10.1109/PQ.2010.5550017","DOIUrl":"https://doi.org/10.1109/PQ.2010.5550017","url":null,"abstract":"50 Hz railway loads, typically supplied by two phases of the transmission system, represent a possible source of the unbalance. The penetration of the unbalance is highly dependent on the stiffness of the power system and connections from the local, public network. This paper presents observations of the unbalance caused by rail loads in two various Finnish areas. Kainuu represents a rural area of a relatively weak transmission system and heavy ore trains. On the opposite, Helsinki urban area has a stiff transmission system and train loads are proportionally considerably minor. These extreme Finnish power system characteristics result in relatively high unbalance values in Kainuu and lower values in Helsinki.","PeriodicalId":356169,"journal":{"name":"Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120937708","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
New Ways In Determining The Earth Fault Duration 确定接地故障持续时间的新方法
Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference Pub Date : 2010-06-16 DOI: 10.1109/PQ.2010.5549992
E. Fuchs, G. Achleitner, C. Obkircher, L. Fickert, M. Sakulin
{"title":"New Ways In Determining The Earth Fault Duration","authors":"E. Fuchs, G. Achleitner, C. Obkircher, L. Fickert, M. Sakulin","doi":"10.1109/PQ.2010.5549992","DOIUrl":"https://doi.org/10.1109/PQ.2010.5549992","url":null,"abstract":"One of the major problems in determining the duration of a single-pole earth fault in compensated networks is to detect the moment of arc extinction. Currently this problem is solved by analysing the time course of the displacement voltage and identifying the moment when the amplitude is rising above or falling below a certain critical value. However, solving the issue that way leads to a high inaccuracy of the derived single-pole earth fault duration. Therefore, new ways for the determination of the earth fault duration were investigated at the Institute for Electrical Power Systems at Graz University of Technology. These new methods allow a very exact determination of the moments of fault beginning and ending. Results of these new methods will be shown. Finally, the advantage and consequences of the resulting improvement - allowing advanced protection strategies or grid operator interactions in the compensated network - will be discussed.","PeriodicalId":356169,"journal":{"name":"Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115176183","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
Evaluation of voltage dip severity (a proposal) 电压倾斜严重程度评估(建议)
Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference Pub Date : 2010-06-16 DOI: 10.1109/PQ.2010.5550019
A. Dán, Z. Czira, G. Dobos, C. Farkas
{"title":"Evaluation of voltage dip severity (a proposal)","authors":"A. Dán, Z. Czira, G. Dobos, C. Farkas","doi":"10.1109/PQ.2010.5550019","DOIUrl":"https://doi.org/10.1109/PQ.2010.5550019","url":null,"abstract":"The paper gives a novel approach to decide if a voltage dip was severe or the equipment attended should operate continuously during the dip. The method gives the possibility to create simple but characteristic general indices like the well known SAIDI. Results of long term measurements will be evaluated with the proposed method and compared with the norm-like classification.","PeriodicalId":356169,"journal":{"name":"Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129328444","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
Fault rates of different types of medium voltage power lines in different environments 不同类型中压线路在不同环境下的故障率
Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference Pub Date : 2010-06-16 DOI: 10.1109/PQ.2010.5549998
M. Lehtonen
{"title":"Fault rates of different types of medium voltage power lines in different environments","authors":"M. Lehtonen","doi":"10.1109/PQ.2010.5549998","DOIUrl":"https://doi.org/10.1109/PQ.2010.5549998","url":null,"abstract":"Society is increasingly dependent on continuous power supply. This is also taken into account in regulation models, where, in Finland, the customer's interruption costs CIC now directly affect the profit allowed for distribution system operators. This has led to the situation, where the CIC directly affects the network planning, including decisions on line types and line routing. Hence, more information is needed for detail planning, about the fault rates of different line types and how these depend on line routing, i.e. line location and surroundings. This paper gives a summary about what is known of fault rates, both in the case of short interruptions (fast and delayed reclosing) and long interruptions (permanent faults). The paper is based partly on fault statistics collected by Finnish Energy Industries and some power companies, partly on analytical studies. The core of the paper is the comparison of bare conductor overhead lines, covered conductor overhead lines, underground cables and air cables, located in forests, along the roads or in open spaces.","PeriodicalId":356169,"journal":{"name":"Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127739929","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: 33
Analyses of supply voltage quality, power consumption and losses affected by shunt capacitors for power factor correction 功率因数校正中并联电容器对电源电压质量、功耗和损耗的影响分析
Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference Pub Date : 2010-06-16 DOI: 10.1109/PQ.2010.5550020
T. Vinnal, K. Janson, H. Kalda, L. Kutt
{"title":"Analyses of supply voltage quality, power consumption and losses affected by shunt capacitors for power factor correction","authors":"T. Vinnal, K. Janson, H. Kalda, L. Kutt","doi":"10.1109/PQ.2010.5550020","DOIUrl":"https://doi.org/10.1109/PQ.2010.5550020","url":null,"abstract":"This paper is focused on active power consumption and losses in industrial and commercial facilities, depending upon supply voltage quality parameters. The shunt capacitors for power factor correction affect directly supply voltage level and harmonic distortions of supply voltage and current and hence affect power losses in industrial facilities, particularly in induction motors. In the paper practical measurement methods are described for estimating power losses when power factor correction capacitors are used. The impact of capacitors upon supply voltage level and harmonic distortions is discussed. Measurement results of voltage and current harmonics spectrum in industrial 0,4 kV power systems are shown.","PeriodicalId":356169,"journal":{"name":"Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130502631","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
Comparison of different methods for earth fault location in compensated networks 补偿网接地故障定位方法的比较
Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference Pub Date : 2010-06-16 DOI: 10.1109/PQ.2010.5549990
A. Dán, D. Raisz
{"title":"Comparison of different methods for earth fault location in compensated networks","authors":"A. Dán, D. Raisz","doi":"10.1109/PQ.2010.5549990","DOIUrl":"https://doi.org/10.1109/PQ.2010.5549990","url":null,"abstract":"The first part of this paper contains a short review on single phase to earth fault location methods in compensated networks. After that a new fault location method is presented that has been implemented recently at Hungarian DSOs. This technique uses current injection parallel to the Petersen coil, and the same device is further used to decrease the harmonics in the residual fault current during sustained earth-fault operation. First field test results are also shown.","PeriodicalId":356169,"journal":{"name":"Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115616013","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
Investigating impacts of distributed generation on distribution networks reliability: A mathematical model 分布式发电对配电网可靠性影响的研究:一个数学模型
Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference Pub Date : 2010-06-16 DOI: 10.1109/PQ.2010.5550010
Iman Khonakdar Tarsi, A. Sheikholeslami, T. Barforoushi, S. Sadati
{"title":"Investigating impacts of distributed generation on distribution networks reliability: A mathematical model","authors":"Iman Khonakdar Tarsi, A. Sheikholeslami, T. Barforoushi, S. Sadati","doi":"10.1109/PQ.2010.5550010","DOIUrl":"https://doi.org/10.1109/PQ.2010.5550010","url":null,"abstract":"In this paper, an analytical approach is proposed for investigating impacts of distributed generation (DG) on distribution network reliability. In our approach, we have proposed a mathematical model applying frequency and duration technique, for evaluating the reliability indices. We have also used islanding probability concept to investigate the frequency and the average of states' durations. In this respect, the probability of islanding in a distribution feeder comprising of two DGs units is considered. Case studies show that the proposed approach can be an appropriate tool for studying the impacts of location of DGs on distribution networks reliability. Therefore, it will help the distribution network planners in the DG resources placement.","PeriodicalId":356169,"journal":{"name":"Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130243511","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
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