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Impact of current high order harmonic to core losses of three-phase distribution transformer 电流高次谐波对三相配电变压器铁心损耗的影响
Eurocon 2013 Pub Date : 2013-07-01 DOI: 10.1109/EUROCON.2013.6625181
M. Digalovski, K. Najdenkoski, G. Rafajlovski
{"title":"Impact of current high order harmonic to core losses of three-phase distribution transformer","authors":"M. Digalovski, K. Najdenkoski, G. Rafajlovski","doi":"10.1109/EUROCON.2013.6625181","DOIUrl":"https://doi.org/10.1109/EUROCON.2013.6625181","url":null,"abstract":"Transformers are normally designed and built for use at rated frequency and sinusoidal load current. A non-linear load on a transformer leads to harmonic power losses which cause increased operational costs and additional heating in transformer parts. It leads to higher losses, early fatigue of insulation, premature failure and reduction of the useful life of the transformer. To prevent these problems, the rated capacity of transformer which supplies harmonic loads must be reduced. In this work a typical 50 KVA three phase distribution transformer with real practical parameters is taken under nonlinear loads generated due to domestic loads. The core losses is evaluated using the three dimensional model of the transformer developed in Ansoft Maxwell based on valid model of transformer under high harmonic conditions. And finally a relation associated with core losses and amplitude of high harmonic order are reviewed & analyzed and then a comparison is being carried out on the results obtained by different excitation current in transformer windings.","PeriodicalId":136720,"journal":{"name":"Eurocon 2013","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117017345","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: 20
BER performance enhancement in OFDM AF fixed gain relay systems OFDM AF固定增益中继系统误码率性能的提高
Eurocon 2013 Pub Date : 2013-07-01 DOI: 10.1109/EUROCON.2013.6625028
E. Kočan, M. Pejanovic, T. Javornik
{"title":"BER performance enhancement in OFDM AF fixed gain relay systems","authors":"E. Kočan, M. Pejanovic, T. Javornik","doi":"10.1109/EUROCON.2013.6625028","DOIUrl":"https://doi.org/10.1109/EUROCON.2013.6625028","url":null,"abstract":"We analysed bit error rate (BER) performance of dual-hop OFDM amplify and forward (AF) relay system with fixed gain (FG) at relay station (R), implementing ordered subcarrier mapping (SCM) at R. A scenario with Rayleigh fading statistics on both hops is assumed. In previous works we showed that in the region of small values of average signal-to-noise ratios (SNRs) on hops best-to-best SCM (BTB SCM) scheme should be applied, while in the region of medium and high values of average SNRs on hops, BER performance improvement is achieved by implementing best-to-worst SCM (BTW SCM) scheme. In this paper we analysed new solution, where in the assumed relay systems with SCM, one or more subcarriers having the lowest SNRs on each hop are omitted. Besides, we examined power balance of the system implementing SCM through comparison of BER performance expressed as a function of power transmitted per subcarrier, with BER performance of the ordinary OFDM AF FG relay system, as well as with the performance in case of direct transmission between source of information (S) and destination terminal (D).","PeriodicalId":136720,"journal":{"name":"Eurocon 2013","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116281765","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
Development of distributed energy management system for intelligent household electricity distribution grid 智能家用配电网分布式能源管理系统的开发
Eurocon 2013 Pub Date : 2013-07-01 DOI: 10.1109/EUROCON.2013.6625172
A. Suzdalenko, M. Vorobyov, I. Galkin
{"title":"Development of distributed energy management system for intelligent household electricity distribution grid","authors":"A. Suzdalenko, M. Vorobyov, I. Galkin","doi":"10.1109/EUROCON.2013.6625172","DOIUrl":"https://doi.org/10.1109/EUROCON.2013.6625172","url":null,"abstract":"Electrical energy consumed in residential sector shares about fourth part of global electricity market, which overlapping with industry and commercial load graphics results in highly uneven demand curve. For this purpose, the demand-side management strategies are utilized to face this problem. This article is dedicated to the development of energy management system for contemporary households utilizing renewable energy sources, energy storages as well as controllable loads, which result in superior operation, capable of controlling local electrical appliances during islanded mode, as well as capable to change the consumption pattern by request from utility grid operator.","PeriodicalId":136720,"journal":{"name":"Eurocon 2013","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123717603","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
Visual debugging support for graph rewriting-based model transformations 基于模型转换的图形重写的可视化调试支持
Eurocon 2013 Pub Date : 2013-07-01 DOI: 10.1109/EUROCON.2013.6625025
T. Mészáros, P. Fehér, L. Lengyel
{"title":"Visual debugging support for graph rewriting-based model transformations","authors":"T. Mészáros, P. Fehér, L. Lengyel","doi":"10.1109/EUROCON.2013.6625025","DOIUrl":"https://doi.org/10.1109/EUROCON.2013.6625025","url":null,"abstract":"Graph rewriting-based model transformation is an essential tool with a strong mathematical background used to process graph-based models. The most recent modeling tools tend to support the definition of rewriting rule based transformations in a visual or textual way. However, only a few of these support the continuous animation of the modifications performed on the models, which makes the traceability and the debugging of transformations more challenging. This paper presents the visual model transformation debugger realized in the Visual Modeling and Transformation System. The solution facilitates the step-by-step execution of model transformations, the visualization of the overall state of the transformation and also supports individual matches. Furthermore, it provides the possibility to influence the behavior of the transformation at runtime. The realized features are illustrated in a case study from the MATLAB Simulink domain.","PeriodicalId":136720,"journal":{"name":"Eurocon 2013","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123729873","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
Adapting multi-agent systems approach for integration of prosumers in Smart Grids 采用多智能体系统方法实现智能电网产消一体化
Eurocon 2013 Pub Date : 2013-07-01 DOI: 10.1109/EUROCON.2013.6625174
S. Lukovic, Elena Boskov Kovac
{"title":"Adapting multi-agent systems approach for integration of prosumers in Smart Grids","authors":"S. Lukovic, Elena Boskov Kovac","doi":"10.1109/EUROCON.2013.6625174","DOIUrl":"https://doi.org/10.1109/EUROCON.2013.6625174","url":null,"abstract":"Massive deployment of distributed energy resources, predominately renewable, is expected to be a general trend in the near future. Integration of such elements in distribution grid represents one of key challenges that Smart Grids will have to face with. In this work we aim at bridging industrial and academic views on future trends in this field. We list main issues to be tackled and we propose a conceptual system-level solution based on Multi-Agent Systems. We show basic functionalities and structure for supporting ICT architecture.","PeriodicalId":136720,"journal":{"name":"Eurocon 2013","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121924396","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
Joule losses and torque ripple caused by current waveforms in small and medium wind turbines 中小型风力发电机电流波形引起的焦耳损耗和转矩脉动
Eurocon 2013 Pub Date : 2013-07-01 DOI: 10.1109/EUROCON.2013.6625088
J. D. Kooning, J. V. D. Vyver, T. Vandoorn, B. Meersman, L. Vandevelde
{"title":"Joule losses and torque ripple caused by current waveforms in small and medium wind turbines","authors":"J. D. Kooning, J. V. D. Vyver, T. Vandoorn, B. Meersman, L. Vandevelde","doi":"10.1109/EUROCON.2013.6625088","DOIUrl":"https://doi.org/10.1109/EUROCON.2013.6625088","url":null,"abstract":"Grid-connected small and medium wind turbines are a promising technology to further increase the share of renewable energy sources. Although their impact on the environment is proven to be advantageous, the cost effectiveness still needs to increase. In this paper, the impact of the passive diode rectifier on the Joule losses in the generator is investigated. Passive diode rectifiers cause unwanted harmonics in the current waveform and a low power factor, increasing the losses. The capacitance value at the output of this rectifier has a large influence on these harmonics. The amount of harmonics could be reduced by including an inductance in series with the generator terminals. However, this results in a higher reactive power demand, which also affects the losses. In this paper, the impact of both the capacitor and inductance values on the losses are investigated.","PeriodicalId":136720,"journal":{"name":"Eurocon 2013","volume":"42 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120860516","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
An empirical analysis of open source software defects data through software reliability growth models 基于软件可靠性增长模型的开源软件缺陷数据实证分析
Eurocon 2013 Pub Date : 2013-07-01 DOI: 10.1109/EUROCON.2013.6625022
Najeeb Ullah, M. Morisio
{"title":"An empirical analysis of open source software defects data through software reliability growth models","authors":"Najeeb Ullah, M. Morisio","doi":"10.1109/EUROCON.2013.6625022","DOIUrl":"https://doi.org/10.1109/EUROCON.2013.6625022","url":null,"abstract":"The purpose of this study is to analyze the reliability growth of Open Source Software (OSS) using Software Reliability Growth Models (SRGM). This study uses defects data of twenty five different releases of five OSS projects. For each release of the selected projects two types of datasets have been created; datasets developed with respect to defect creation date (created date DS) and datasets developed with respect to defect updated date (updated date DS). These defects datasets are modelled by eight SRGMs; Musa Okumoto, Inflection S-Shaped, Goel Okumoto, Delayed S-Shaped, Logistic, Gompertz, Yamada Exponential, and Generalized Goel Model. These models are chosen due to their widespread use in the literature. The SRGMs are fitted to both types of defects datasets of each project and the their fitting and prediction capabilities are analysed in order to study the OSS reliability growth with respect to defects creation and defects updating time because defect analysis can be used as a constructive reliability predictor. Results show that SRGMs fitting capabilities and prediction qualities directly increase when defects creation date is used for developing OSS defect datasets to characterize the reliability growth of OSS. Hence OSS reliability growth can be characterized with SRGM in a better way if the defect creation date is taken instead of defects updating (fixing) date while developing OSS defects datasets in their reliability modelling.","PeriodicalId":136720,"journal":{"name":"Eurocon 2013","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126115309","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: 9
Tool for automatic layout of business process model represented by UML activity diagram 用于自动布局以UML活动图表示的业务流程模型的工具
Eurocon 2013 Pub Date : 2013-07-01 DOI: 10.1109/EUROCON.2013.6625033
A. Malesevic, D. Brdjanin, S. Maric
{"title":"Tool for automatic layout of business process model represented by UML activity diagram","authors":"A. Malesevic, D. Brdjanin, S. Maric","doi":"10.1109/EUROCON.2013.6625033","DOIUrl":"https://doi.org/10.1109/EUROCON.2013.6625033","url":null,"abstract":"This paper presents a software tool for the automatic visualization of the UML activity diagram representing a business process model. The implemented tool takes the XMI-based representation of a programmatically generated activity diagram as the input and automatically generates its layout in accordance with the UMLDI specification. This auto layout feature is implemented as an Eclipse-Topcased plug-in named VisualAD.","PeriodicalId":136720,"journal":{"name":"Eurocon 2013","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129893795","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
Mathematical simulation technique for power systems based on diode-clamped multilevel VSC 基于二极管箝位多电平VSC的电力系统数学仿真技术
Eurocon 2013 Pub Date : 2013-07-01 DOI: 10.1109/EUROCON.2013.6625095
M. Dybko, S. Brovanov, S. Kharitonov
{"title":"Mathematical simulation technique for power systems based on diode-clamped multilevel VSC","authors":"M. Dybko, S. Brovanov, S. Kharitonov","doi":"10.1109/EUROCON.2013.6625095","DOIUrl":"https://doi.org/10.1109/EUROCON.2013.6625095","url":null,"abstract":"This paper presents a method for mathematical simulation of different power conversion systems based on diode-clamped multilevel power converters. The method is being a powerful tool for mathematical analysis of any system as far as it allows easy calculation of any power parameters of the system such as THD, WTHD, power factor; efficiency etc. under different operation conditions and control strategies. The base of the introduced mathematical analysis is the switching functions. As an example, three-level voltage source converter with space vector PWM is considered.","PeriodicalId":136720,"journal":{"name":"Eurocon 2013","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128246079","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: 12
Influence of operating conditions on hydrounit power oscillations 运行工况对水力振荡的影响
Eurocon 2013 Pub Date : 2013-07-01 DOI: 10.1109/EUROCON.2013.6625169
M. Brezovec, Blazenka Brkljac, I. Kuzle
{"title":"Influence of operating conditions on hydrounit power oscillations","authors":"M. Brezovec, Blazenka Brkljac, I. Kuzle","doi":"10.1109/EUROCON.2013.6625169","DOIUrl":"https://doi.org/10.1109/EUROCON.2013.6625169","url":null,"abstract":"Because of many different instability reasons, power unit stability problems should be analyzed in details for each specific case. This paper describes a specific case of power oscillations problem of hydroelectric power unit with double regulated bulb turbine. In some working conditions, natural frequency of electromechanical oscillations could be close to the rotor speed frequency and small disturbance on turbine would be amplified few times because of electromechanical resonance. Influence of operating conditions on natural frequency is analyzed using mathematical model of synchronous machine with excitation system. Simulation model results show that natural frequency decreases significantly with active power increase and near maximum active power becomes close enough to the rotor speed frequency to enter resonance mode.","PeriodicalId":136720,"journal":{"name":"Eurocon 2013","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127122677","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: 4
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