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2008 Power Quality and Supply Reliability Conference最新文献

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Improvement of voltage transformers overvoltage problems in MV networks 中压网络中电压互感器过电压问题的改进
2008 Power Quality and Supply Reliability Conference Pub Date : 2008-10-17 DOI: 10.1109/PQ.2008.4653769
K. Janson, J. Jarvik, L. Kutt, A. Soosalu
{"title":"Improvement of voltage transformers overvoltage problems in MV networks","authors":"K. Janson, J. Jarvik, L. Kutt, A. Soosalu","doi":"10.1109/PQ.2008.4653769","DOIUrl":"https://doi.org/10.1109/PQ.2008.4653769","url":null,"abstract":"An investigation conducted almost 10 years ago revealed that one of the causes for transformer breakdown was ferroresonance effects. As a result a new specification for the voltage transformers was issued by Estonian Power Company. Now the first of transformers with improved characteristics have been in service for years, any further breakdowns have been experienced. This paper looks at the improvements to the specifications that leaded to the improvement of the voltage transformers reliability.","PeriodicalId":429968,"journal":{"name":"2008 Power Quality and Supply Reliability Conference","volume":"112 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":"128105287","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
Wind power integration in Estonia under planning contingencies 爱沙尼亚在规划应急情况下的风力发电整合
2008 Power Quality and Supply Reliability Conference Pub Date : 2008-10-17 DOI: 10.1109/PQ.2008.4653746
O. Tsernobrovkin, J. Kilter, A. Reinson, E. Ulavere
{"title":"Wind power integration in Estonia under planning contingencies","authors":"O. Tsernobrovkin, J. Kilter, A. Reinson, E. Ulavere","doi":"10.1109/PQ.2008.4653746","DOIUrl":"https://doi.org/10.1109/PQ.2008.4653746","url":null,"abstract":"An enormous interest from wind energy developers is forcing system operators to develop new solutions and proposals for connecting new wind farms without endangering the system security. Year by year the number of connected wind farms is increasing and the same trend also applies for the capacities of single wind farms. Small power systems are especially in a complicated situation because their configuration is not suitable for large wind power penetration. In this paper current situation and the future visions of wind power development in Estonia are described and additionally wind generation influence to Estonian power system is analysed based on conducted power system case study.","PeriodicalId":429968,"journal":{"name":"2008 Power Quality and Supply Reliability Conference","volume":"57 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":"125753685","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
Control strategies and comparison of the Dynamic Voltage Restorer 动态电压恢复器的控制策略及比较
2008 Power Quality and Supply Reliability Conference Pub Date : 2008-10-17 DOI: 10.1109/PQ.2008.4653741
R. Strzelecki, G. Benysek
{"title":"Control strategies and comparison of the Dynamic Voltage Restorer","authors":"R. Strzelecki, G. Benysek","doi":"10.1109/PQ.2008.4653741","DOIUrl":"https://doi.org/10.1109/PQ.2008.4653741","url":null,"abstract":"This paper focuses on a selection problems of mitigation of the voltage disturbance by of the Dynamic Voltage Restorers (DVRpsilas). In short form presented and discussed are the basis of different control strategies of the DVR. The main emphasis is placed on application of modern power electronic devices. Authors of this paper in particular occupy oneself with analysis of the power rating of the typically DVR topologies. These problems are according to authors very important, because it makes possible to find optimum configuration of the DVR and energy capacity of the additional sources power.","PeriodicalId":429968,"journal":{"name":"2008 Power Quality and Supply Reliability Conference","volume":"84 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":"121971619","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
Modeling of Jeju island power grid system using PSCAD/EMTDC 基于PSCAD/EMTDC的济州岛电网系统建模
2008 Power Quality and Supply Reliability Conference Pub Date : 2008-10-17 DOI: 10.1109/PQ.2008.4653747
Jae-Hong Kim, Eel-Hwan Kim, Se-Ho Kim, Seong-Bo Oh, Jaeho Choi
{"title":"Modeling of Jeju island power grid system using PSCAD/EMTDC","authors":"Jae-Hong Kim, Eel-Hwan Kim, Se-Ho Kim, Seong-Bo Oh, Jaeho Choi","doi":"10.1109/PQ.2008.4653747","DOIUrl":"https://doi.org/10.1109/PQ.2008.4653747","url":null,"abstract":"This paper presents the modeling of Jeju island power grid system connected with wind farm, current source type HVDC system, and thermal power plant using PSCAD/EMTDC. It is for analyzing the characteristics of thermal power plant, HVDC system and wind farm operation in steady and transient state. For the computer simulation, four kinds of main items are modeled, which are 83(MW) wind farm, 300(MW) HVDC system, thermal power plant and Jeju power grid load. To analyze the influence of the wind power generation in Jeju power grid system, two kinds of simulations are carried out. One is the steady state operation under the variable wind speed, and the other is the transient state operation when all of wind farms in Jeju island are disconnected from the Jeju power grid instantaneously due to the over rated wind speed. With the simulation results, it is useful to analyze the operating characteristics of power thermal plant, HVDC system, and wind farms on Jeju island power grid system, and the system stabilities.","PeriodicalId":429968,"journal":{"name":"2008 Power Quality and Supply Reliability Conference","volume":"42 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":"133079503","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
Analytical method for investigation of three-phase converter systems in steady state operation based on space phasors 基于空间相量的三相变流器系统稳态运行分析方法
2008 Power Quality and Supply Reliability Conference Pub Date : 2008-10-17 DOI: 10.1109/PQ.2008.4653738
G. Herold
{"title":"Analytical method for investigation of three-phase converter systems in steady state operation based on space phasors","authors":"G. Herold","doi":"10.1109/PQ.2008.4653738","DOIUrl":"https://doi.org/10.1109/PQ.2008.4653738","url":null,"abstract":"A method for analytical calculation of phase-commutated converters based on space phasors is presented. For it the steady state operation of the converters is considered as a periodical sequence of transient switching processes. The order of the state space of the sCS is not limited belonging to the computation, but it is limited surely belonging to the interpretation of the computational results. The method can be used for investigation of extreme and optimum operating points as well. It delivers all of the factors to describe power quality. 3-phase ac systems with FACTS equipment (Flexible AC Transmission Systems) based on thyristors are of the 6pulse type also. They can calculated by using this method as well.","PeriodicalId":429968,"journal":{"name":"2008 Power Quality and Supply Reliability Conference","volume":"62 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":"134534906","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
Multipole surface-mounted permanent magnet synchronous generators for wind applications 多极面贴式永磁同步风力发电机
2008 Power Quality and Supply Reliability Conference Pub Date : 2008-10-17 DOI: 10.1109/PQ.2008.4653767
A. Kilk, A. Kallaste
{"title":"Multipole surface-mounted permanent magnet synchronous generators for wind applications","authors":"A. Kilk, A. Kallaste","doi":"10.1109/PQ.2008.4653767","DOIUrl":"https://doi.org/10.1109/PQ.2008.4653767","url":null,"abstract":"This paper presents an analysis of tendencies in development and design of small-scale wind power applications on the basis of directly driven low-speed multipole permanent magnet synchronous generators. Analysis of primary magnetic field distribution and armature reaction in the conditions of surface-mounted radial magnetic flux permanent magnet system with non-constant air-gap thickness has been presented. The results of modelling and experimentally tested primary magnetic field distribution in air-gap has been analyzed and compared with the calculated data.","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":"122052939","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
Short interruptions caused by lightning in overhead line medium voltage networks 架空线路中压电网雷电引起的短时中断
2008 Power Quality and Supply Reliability Conference Pub Date : 2008-10-17 DOI: 10.1109/PQ.2008.4653751
M. Parviainen, P. Heine, M. Omidiora, M. Lehtonen, J. Niskanen, A. Oikarinen
{"title":"Short interruptions caused by lightning in overhead line medium voltage networks","authors":"M. Parviainen, P. Heine, M. Omidiora, M. Lehtonen, J. Niskanen, A. Oikarinen","doi":"10.1109/PQ.2008.4653751","DOIUrl":"https://doi.org/10.1109/PQ.2008.4653751","url":null,"abstract":"Lightning strokes represent a considerable cause of short interruptions in overhead line medium voltage networks. The overvoltages caused by lightning can not be avoided but their influence can be limited by appropriate overvoltage protection. This paper presents the results of theoretical studies about the number of short interruptions caused by lightning in various environmental circumstances. The results will be compared to the fault statistics collected from Kainuun Energia. In the calculations, the environmental conditions, ground flash densities and various overvoltage protection types of power distribution transformers are taken into account. At the end, further research is discussed.","PeriodicalId":429968,"journal":{"name":"2008 Power Quality and Supply Reliability Conference","volume":"100 5 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":"124178743","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
Impact of power quality parameters on the economic transformer load 电能质量参数对变压器经济负荷的影响
2008 Power Quality and Supply Reliability Conference Pub Date : 2008-10-17 DOI: 10.1109/PQ.2008.4653731
H. Schau, A. Novitskiy
{"title":"Impact of power quality parameters on the economic transformer load","authors":"H. Schau, A. Novitskiy","doi":"10.1109/PQ.2008.4653731","DOIUrl":"https://doi.org/10.1109/PQ.2008.4653731","url":null,"abstract":"On the base of the analysis of the actual distribution transformer load in a real urban electric power system, it will be shown that the conventional approach for the estimation of the economic transformer load, which is based on the criterion of transformer operation cost minimization, is not sufficient for the decision about the permissible load of distribution transformers in the grid. In modern urban networks it is necessary to take into consideration power quality requirements for the economic transformer load estimation..","PeriodicalId":429968,"journal":{"name":"2008 Power Quality and Supply Reliability Conference","volume":"30 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":"123218599","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
EMI reduction problems in power converters with 6.5 kV IGBTs 6.5 kV igbt功率变换器中的电磁干扰抑制问题
2008 Power Quality and Supply Reliability Conference Pub Date : 2008-10-17 DOI: 10.1109/PQ.2008.4653766
T. Jalakas, H. Mõlder, M. Egorov
{"title":"EMI reduction problems in power converters with 6.5 kV IGBTs","authors":"T. Jalakas, H. Mõlder, M. Egorov","doi":"10.1109/PQ.2008.4653766","DOIUrl":"https://doi.org/10.1109/PQ.2008.4653766","url":null,"abstract":"The main topic of this paper are the EMI reduction problems in high voltage power converters with 6.5 kV IGBTs. The generation process of electromagnetic interference is briefly analyzed and some EMI reduction methods are introduced. Theoretical analysis, calculation and experimental results of choosing the snubber circuit for minimization of parasitic ringing are described. The effect of EMI suppression circuit was also experimentally tested on output rectifier of described power converter.","PeriodicalId":429968,"journal":{"name":"2008 Power Quality and Supply Reliability Conference","volume":"52 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":"126505229","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
An earth fault distance location algorithm in compensated networks with additional estimation of the fault impedance and fault current 一种附加故障阻抗和故障电流估计的补偿网络接地故障距离定位算法
2008 Power Quality and Supply Reliability Conference Pub Date : 2008-10-17 DOI: 10.1109/PQ.2008.4653760
G. Achleitner, C. Obkircher, L. Fickert, M. Sakulin, C. Raunig
{"title":"An earth fault distance location algorithm in compensated networks with additional estimation of the fault impedance and fault current","authors":"G. Achleitner, C. Obkircher, L. Fickert, M. Sakulin, C. Raunig","doi":"10.1109/PQ.2008.4653760","DOIUrl":"https://doi.org/10.1109/PQ.2008.4653760","url":null,"abstract":"Earth fault distance protection with distance protection relays is common practice in solidly grounded networks. However, in compensated networks earth faults can cause big problems, because they do not extinguish themselves. To find the fault point is from high interest also in combination with network expansion [9]. In previous investigations the authors found that the classic algorithm of these distance protection relays principally can be used also for compensated networks, - however the accuracy of the distance calculation strongly depends on the network conditions [1],[2]. In this paper a new improved algorithm is developed. For this purpose an exact 3-phase mathematical simulation model of the investigated network is used to check the results of the improved algorithm. The simulations show, that this improved distance calculation provides very good accuracy up to earth fault transitions impedances of 1 kohm. Furtheron it is shown in the paper that the same algorithm can be used in 2-phase networks as well. With the implemented improvements the algorithm again allows earth fault transitions impedances of up to 1 kOhm. Finally, the simulation results are validated by real test data to verify the usability of this improved algorithm.","PeriodicalId":429968,"journal":{"name":"2008 Power Quality and Supply Reliability Conference","volume":"28 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":"121808559","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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