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2008 Power Quality and Supply Reliability Conference最新文献

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Experimental performance investigation of double-layer shields at power frequency magnetic shielding 工频磁屏蔽双层屏蔽层的实验性能研究
2008 Power Quality and Supply Reliability Conference Pub Date : 2008-10-17 DOI: 10.1109/PQ.2008.4653762
S. Koroglu, N. Umurkan, O. Kilic
{"title":"Experimental performance investigation of double-layer shields at power frequency magnetic shielding","authors":"S. Koroglu, N. Umurkan, O. Kilic","doi":"10.1109/PQ.2008.4653762","DOIUrl":"https://doi.org/10.1109/PQ.2008.4653762","url":null,"abstract":"Double-layer shields have received attention in magnetic shielding at extremely low frequency. Also, cylindrical shape is one of shielding structures widely used in industry. In this study, cylindrical shaped shields with commonly available and inexpensive materials used for power frequency magnetic field shielding. The magnetic shielding performances are investigated experimentally for single and double-layer shields at power frequencies. The aim of this work is to extend the discussion in the area of shielding performance of the double-layer shields.","PeriodicalId":429968,"journal":{"name":"2008 Power Quality and Supply Reliability Conference","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125584261","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
Improvement of voltage quality in connection of wind farms to transmission network using VSC-HVDC 用VSC-HVDC改善风电场与输电网的连接电压质量
2008 Power Quality and Supply Reliability Conference Pub Date : 2008-10-17 DOI: 10.1109/PQ.2008.4653750
H. Livani, J. Rouhi, S. Lesan, H. Karimi-Davijani
{"title":"Improvement of voltage quality in connection of wind farms to transmission network using VSC-HVDC","authors":"H. Livani, J. Rouhi, S. Lesan, H. Karimi-Davijani","doi":"10.1109/PQ.2008.4653750","DOIUrl":"https://doi.org/10.1109/PQ.2008.4653750","url":null,"abstract":"This paper studies possible improvements of voltage quality in connection of 40 MW wind farm to transmission network using VSC-HVDC link. The 40 MW wind farm includes 20 individual 2 MW permanent magnet synchronous generators. The voltage at the transmission network terminal should be re-established with minimized power losses during wind speed fluctuations and after the clearance of grid side faults. This paper emphasizes on a modified decoupling control strategy which is implemented in VSC-HVDC converters to obtain variable speed operation and voltage stabilization in wind farm network and transmission network respectively. Simulations using PSCAD/EMTDC are performed to study behavior of wind farm, transmission voltage and dc voltage for different changes in wind speed and three-phase fault and a 20% voltage sag on transmission network. The simulation results confirm the connection method and the modified decoupling control strategy.","PeriodicalId":429968,"journal":{"name":"2008 Power Quality and Supply Reliability Conference","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116870537","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 transient fault detection technique with varying fault detection window of earth modes in unearthed MV systems 地下中压系统变接地模态故障检测窗口的暂态故障检测技术
2008 Power Quality and Supply Reliability Conference Pub Date : 2008-10-17 DOI: 10.1109/PQ.2008.4653758
M. F. Abdel-Fattah, M. Lehtonen
{"title":"A transient fault detection technique with varying fault detection window of earth modes in unearthed MV systems","authors":"M. F. Abdel-Fattah, M. Lehtonen","doi":"10.1109/PQ.2008.4653758","DOIUrl":"https://doi.org/10.1109/PQ.2008.4653758","url":null,"abstract":"This paper presents a transient fault detection technique in unearthed medium voltage systems. The system is simulated by ATP/EMTP program. A suitable fault detection window is introduced. The window width is the most sensitive part in the transient period. It is varying according to fault characteristics. The average impedance of the earth mode is calculated from voltage and current earth modes in the window. Based on the amplitude of the impedance, the feeder is confirmed to be faulted or not. The setting of detection is proposed from the simulation results that cover different fault inception angles and fault resistances.","PeriodicalId":429968,"journal":{"name":"2008 Power Quality and Supply Reliability Conference","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115997107","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: 15
Novel techniques for fault location in distribution networks 配电网故障定位新技术
2008 Power Quality and Supply Reliability Conference Pub Date : 2008-10-17 DOI: 10.1109/PQ.2008.4653761
M. Lehtonen
{"title":"Novel techniques for fault location in distribution networks","authors":"M. Lehtonen","doi":"10.1109/PQ.2008.4653761","DOIUrl":"https://doi.org/10.1109/PQ.2008.4653761","url":null,"abstract":"The paper discusses different possible applications of fault location for distribution networks. For fault distance computation various solutions for short circuit faults are first presented. Then the various attempts to solve the earth fault distance estimation in ungrounded and compensated neutral systems are outlined. In the latter part of the paper the fault indicator techniques are reviewed.","PeriodicalId":429968,"journal":{"name":"2008 Power Quality and Supply Reliability Conference","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115466074","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: 16
New technique for categorization of Power Quality disturbances 电能质量扰动分类新技术
2008 Power Quality and Supply Reliability Conference Pub Date : 2008-10-17 DOI: 10.1109/PQ.2008.4653730
N. Talaat, W. Ibrahim, G. Kusic
{"title":"New technique for categorization of Power Quality disturbances","authors":"N. Talaat, W. Ibrahim, G. Kusic","doi":"10.1109/PQ.2008.4653730","DOIUrl":"https://doi.org/10.1109/PQ.2008.4653730","url":null,"abstract":"Providing effective classification techniques for various power quality (PQ) events is gaining the attention of the research community. The process of power quality analysis and diagnosis is a complex one for many reasons, including the complex modeling of power systems, the extensive amount of system data that is currently available through PQ monitors, and the lack of expert knowledge. Therefore, it is evident that computerized system analysis is vital for the realization of effective and efficient power quality diagnosis systems. In this paper two intelligent techniques are developed that perform power quality classification functions. These techniques are based on wavelet analysis, subtractive cluster algorithms and Artificial Neural Networks (ANN). Many signals are generated to simulate different types of power quality phenomena then wavelet analysis is applied to these signals. Different feature extraction methods are proposed to reduce the amount of processed data which dramatically improves the performance of the proposed PQ classifier compared to other techniques proposed elsewhere. The extracted features are then used to train different ANNs.","PeriodicalId":429968,"journal":{"name":"2008 Power Quality and Supply Reliability Conference","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116578699","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
Limiting the number of the most severe voltage sags in rural medium voltage networks 限制农村中压电网中最严重电压跌落的数量
2008 Power Quality and Supply Reliability Conference Pub Date : 2008-10-17 DOI: 10.1109/PQ.2008.4653744
P. Heine, M. Lehtonen, J. Niskanen, A. Oikarinen
{"title":"Limiting the number of the most severe voltage sags in rural medium voltage networks","authors":"P. Heine, M. Lehtonen, J. Niskanen, A. Oikarinen","doi":"10.1109/PQ.2008.4653744","DOIUrl":"https://doi.org/10.1109/PQ.2008.4653744","url":null,"abstract":"In Finland during summer time, lightning may cause a considerably high number of short interruptions and voltage sags. In case of lightning, the overvoltage protection of power distribution transformers has an important role. In case of special concern of voltage sags, the means to limit the short circuit faults causing voltage sags should be focused to the neighbourhood of the primary (110/20 kV) substation. To contribute this matter, this paper presents results of a study where spark gaps were replaced with externally gapped metal-oxide surge arresters near the primary substation. As well the theoretical studies as measurement results encourage to carry on with such investments.","PeriodicalId":429968,"journal":{"name":"2008 Power Quality and Supply Reliability Conference","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114928216","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
Monitoring of the technical condition of the power supply system’s equipment and operating reliability 对供电系统设备的技术状况和运行可靠性进行监控
2008 Power Quality and Supply Reliability Conference Pub Date : 2008-08-01 DOI: 10.1109/PQ.2008.4653737
A. Nazarychev, A. Tadzhibaev, Y. Solovyev
{"title":"Monitoring of the technical condition of the power supply system’s equipment and operating reliability","authors":"A. Nazarychev, A. Tadzhibaev, Y. Solovyev","doi":"10.1109/PQ.2008.4653737","DOIUrl":"https://doi.org/10.1109/PQ.2008.4653737","url":null,"abstract":"In the paper the main principles, criteria and models of technical condition monitoring of electric equipment during service life are described. Criterion of electric equipment service life monitoring effectiveness estimation is offered.","PeriodicalId":429968,"journal":{"name":"2008 Power Quality and Supply Reliability Conference","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125267538","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
Concepts and practical neutral earthing modes in Latvia’s 20kV rural networks 拉脱维亚20kV农村电网中性点接地模式的概念和实践
2008 Power Quality and Supply Reliability Conference Pub Date : 2008-08-01 DOI: 10.1109/PQ.2008.4653759
V. Šults, G. Kalcevs
{"title":"Concepts and practical neutral earthing modes in Latvia’s 20kV rural networks","authors":"V. Šults, G. Kalcevs","doi":"10.1109/PQ.2008.4653759","DOIUrl":"https://doi.org/10.1109/PQ.2008.4653759","url":null,"abstract":"The article presents concepts of neutral earthing in Latviapsilas 20 kV rural networks and theoretical research of the problems. The article will show research of neutral earthing modes in Latviapsilas 20 kV rural networks and will give better solution for this realization.","PeriodicalId":429968,"journal":{"name":"2008 Power Quality and Supply Reliability Conference","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114865677","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
Transient processes in primary winding of voltage transformers under single-phase short circuits in 110 kV power grids with cable fixings 110 kV电缆固定电网单相短路电压互感器一次绕组暂态过程
2008 Power Quality and Supply Reliability Conference Pub Date : 2008-08-01 DOI: 10.1109/PQ.2008.4653756
K. Anastasiya, S. Leonid
{"title":"Transient processes in primary winding of voltage transformers under single-phase short circuits in 110 kV power grids with cable fixings","authors":"K. Anastasiya, S. Leonid","doi":"10.1109/PQ.2008.4653756","DOIUrl":"https://doi.org/10.1109/PQ.2008.4653756","url":null,"abstract":"Of late years, in densely housed megapolises 110-kV line circuits are used overhead and cable line sections. Most frequently occurring emergency states in such grids arise from line-to-ground faults with inflammation of electromagnetic voltage transformers. The causes of such accidents and developing efficient prevention measures are considered in this paper.","PeriodicalId":429968,"journal":{"name":"2008 Power Quality and Supply Reliability Conference","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125567220","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
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