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2019 20th International Scientific Conference on Electric Power Engineering (EPE)最新文献

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Effect of Thermal Stress on the Hybrid Fibre/Particle Nanocomposite 热应力对纤维/颗粒复合材料的影响
2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8777947
O. Michal, V. Mentlík, J. Hornak, P. Trnka, P. Totzauer
{"title":"Effect of Thermal Stress on the Hybrid Fibre/Particle Nanocomposite","authors":"O. Michal, V. Mentlík, J. Hornak, P. Trnka, P. Totzauer","doi":"10.1109/EPE.2019.8777947","DOIUrl":"https://doi.org/10.1109/EPE.2019.8777947","url":null,"abstract":"Nanocomposites are the next generation of materials for various types of applications. Their advantageous properties are now often used in modern applications as coatings or as gas barriers. In the future, the combination of conventional materials and nanocomponents will be more visible than it is today. This is due to their enhancing effect on the base material. Today's experiments with nanocomponents also include commonly used high voltage materials, such as epoxy resin. In combination with nanocomponents, the positive effect on the electrical, mechanical and also chemical properties is observed. One of the important attributes is a life span of the material, which means the preservation of optimal parameters in time. Importance of investigation of life span is to predict the time in which is safe to use the material without damaging the machine or, in the worst scenario, hurt a person. This article presents an experiment where the electrical parameters of nanocomposite materials under thermal stress are investigated. Pure epoxy resin, epoxy resin with nanoparticles and epoxy resin with hybrid nanoparticle/nanofiber filler were exposed to a temperature of 220 °C for 1000 hours. The positive influence of nanocomponents on the life span is observed.","PeriodicalId":117212,"journal":{"name":"2019 20th International Scientific Conference on Electric Power Engineering (EPE)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121241460","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
Possibilities of Photovoltaic Power Plants Connectable Power Increasing in Low Voltage Grids 在低压电网中增加光伏电站并网功率的可能性
2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8778046
M. Vojtek, P. Mastný, J. Morávek, Rafael Bogo Portal Chagas
{"title":"Possibilities of Photovoltaic Power Plants Connectable Power Increasing in Low Voltage Grids","authors":"M. Vojtek, P. Mastný, J. Morávek, Rafael Bogo Portal Chagas","doi":"10.1109/EPE.2019.8778046","DOIUrl":"https://doi.org/10.1109/EPE.2019.8778046","url":null,"abstract":"This paper deals with calculations of maximum values of photovoltaic power, which can be connected into low voltage distribution grids regarding to currently valid legislation. A particular distribution grid, consisting of a radial feeder, is considered. The calculations are carried out for several variants that are expected to have a positive impact from connectable power increasing point of view. Variants involve utilization of autonomous inverters regulation functions or reinforcement of the distribution grid infrastructure as well as the combination of these options. All of the variants are subsequently compared and evaluated. For each of them, based on a theoretical analysis, a potential for increasing of connectable power in the considered distribution grid is quantified.","PeriodicalId":117212,"journal":{"name":"2019 20th International Scientific Conference on Electric Power Engineering (EPE)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116656011","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
Correlation analysis of hotspot temperatures in power transformer – a case study 电力变压器热点温度的相关性分析——以实例为例
2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8778179
M. Kunicki
{"title":"Correlation analysis of hotspot temperatures in power transformer – a case study","authors":"M. Kunicki","doi":"10.1109/EPE.2019.8778179","DOIUrl":"https://doi.org/10.1109/EPE.2019.8778179","url":null,"abstract":"This paper presents a correlation analysis of hotspot (HS) temperatures in power transformers on the example of two representative units coming from over 1000-unit population of high voltage (HV) to medium voltage (MV) transformers. Analyzed population is characterized by relatively low load and high age. Measuring data form one year period with 1h steps are gathered for analysis by on-line temperature monitoring systems mounted in the transformers. Analyzed data consist of ambient temperature, winding HS temperatures and load. Conducted correlation analysis shows that regarding that fleet there is relatively low correlation between load and HS temperature, and HS temperature is mainly depended on the ambient temperature. Observed dependencies may be used for optimization of the present thermal prediction models of the HS temperature in terms of the application for some similar, low loaded transformer populations.","PeriodicalId":117212,"journal":{"name":"2019 20th International Scientific Conference on Electric Power Engineering (EPE)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127926137","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
Power Flow Analysis of Networks with Loads of Constant Current - Constant Power Factor Type 恒流-恒功率因数型负荷电网潮流分析
2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8777975
Marek Höger, Marek Siranec, J. Altus
{"title":"Power Flow Analysis of Networks with Loads of Constant Current - Constant Power Factor Type","authors":"Marek Höger, Marek Siranec, J. Altus","doi":"10.1109/EPE.2019.8777975","DOIUrl":"https://doi.org/10.1109/EPE.2019.8777975","url":null,"abstract":"Modelling loads as constant current loads is a common technique used for load flow analysis of distribution networks, however this technique is not able to represent the power factor of loads correctly. Typically, the angle of the current representing a load is set relative to the angle of slack bus voltage and not to the related nodal voltage, which is unknown prior the calculation. In networks with high R:x ratio and limited reactive power flow, the resulting error in power factor of individual loads is often relatively small and can be neglected. However, if the power factor of the loads has to be respected during calculation with high precision, modification of the standard calculation algorithms is necessary. This paper presents the modifications of standard load flow algorithms necessary to allow load flow analysis of networks with loads of constant current amplitude - constant power factor type. Algorithms presented in this paper were tested on a set of simple test networks with variable size to verify, how the presented modifications of standard implementations are affecting the convergence characteristics of the algorithms and the absolute accuracy of results. Experimental results have confirmed that all presented algorithms are able to provide accurate results and the impact on the speed of convergence is neglectable.","PeriodicalId":117212,"journal":{"name":"2019 20th International Scientific Conference on Electric Power Engineering (EPE)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133398279","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
Experimental Study of High Frequency Electromagnetic Field Penetration Through Building Material - Concrete Wall 高频电磁场穿透建筑材料-混凝土墙体的实验研究
2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8778183
M. Pavlík, J. Zbojovský, Maksym Oliinyk, M. Ivančák
{"title":"Experimental Study of High Frequency Electromagnetic Field Penetration Through Building Material - Concrete Wall","authors":"M. Pavlík, J. Zbojovský, Maksym Oliinyk, M. Ivančák","doi":"10.1109/EPE.2019.8778183","DOIUrl":"https://doi.org/10.1109/EPE.2019.8778183","url":null,"abstract":"Electromagnetic shielding has been enjoying greater attention recently. On one side, it is due to the electromagnetic compatibility of electric and electronic devices. On the other, it is because of the electromagnetic effect on living organisms, a human being included. We are constantly exposed to the electromagnetic field which is why it is important to raise this issue. The proposed contribution presents the results of research into the shielding of a construction object concrete towards the electromagnetic field. Shielding is defined as shielding effectiveness. Shielding effectiveness is defined by a product of reflection and absorption of the electromagnetic field. The experiment in this contribution concentrates on measurement of shielding effectiveness and reflection of the electromagnetic field. Measured object was concrete wall 120 mm thickness composed of cement and water. Based on these observables it is possible to calculate the electromagnetic absorption which is difficult to measure.","PeriodicalId":117212,"journal":{"name":"2019 20th International Scientific Conference on Electric Power Engineering (EPE)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114101475","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
Adsorption in an Exhaust Gases Aftertreatment - Computer-Aided Calculations 废气后处理中的吸附。计算机辅助计算
2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8778080
Melisa Dubiel, J. Wydrych
{"title":"Adsorption in an Exhaust Gases Aftertreatment - Computer-Aided Calculations","authors":"Melisa Dubiel, J. Wydrych","doi":"10.1109/EPE.2019.8778080","DOIUrl":"https://doi.org/10.1109/EPE.2019.8778080","url":null,"abstract":"after any combusting process, there is an amount of exhaust gas that can provide unwanted air pollution, caused by its temperature, certain products concentration, and dust. To decrease the undesirable effect on the atmosphere, there are being installed some installations into the whole powerhouse system, that are dedicated to lowering the danger of causing the environmental impurity. One of the processes, that affects the concentration of the specific product in the exhaust gas, is adsorption. To help, accelerate and simplify the engineering calculations, there are available some computer programs, designed to do so.","PeriodicalId":117212,"journal":{"name":"2019 20th International Scientific Conference on Electric Power Engineering (EPE)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117325646","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
Reversible Coupling Converter 可逆耦合变换器
2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8778122
Jan Strossa, Vladislav Damec
{"title":"Reversible Coupling Converter","authors":"Jan Strossa, Vladislav Damec","doi":"10.1109/EPE.2019.8778122","DOIUrl":"https://doi.org/10.1109/EPE.2019.8778122","url":null,"abstract":"This paper deals with a new universal coupling converter, which has been realized in form of a laboratory sample at Department of Electronics, FEECS. The circumstances of demand of a new coupling solution are presented firstly, descriptions of new concept and its function follows. Finally, the results obtained from the realized model are stated.","PeriodicalId":117212,"journal":{"name":"2019 20th International Scientific Conference on Electric Power Engineering (EPE)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124906475","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
Differential Protection for Converter Transformers in Three-Level Active- Front- End Large Drive Systems 三电平主动前端大型驱动系统中换流变压器的差动保护
2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8778062
K. Solak, W. Rebizant, Frank Mieske
{"title":"Differential Protection for Converter Transformers in Three-Level Active- Front- End Large Drive Systems","authors":"K. Solak, W. Rebizant, Frank Mieske","doi":"10.1109/EPE.2019.8778062","DOIUrl":"https://doi.org/10.1109/EPE.2019.8778062","url":null,"abstract":"In this paper, simulation of large motor drives with three-level neutral point clamped converters and testing results of converter transformer differential protection are presented. The protected converter transformer is used for supply of active front end converters. The converter transformer itself must be protected by a relay being able to operate with highly distorted signals by higher harmonics. One should be aware that high content of harmonics (2nd, 5th) may cause problem with sensitivity and stabilization of protection. An appropriate simulation model of the converter transformer and three-level neutral point clamped converters with adequate control was developed in MATLAB/Simulink environment. Testing results of transformer differential protection operation for various disturbances are presented.","PeriodicalId":117212,"journal":{"name":"2019 20th International Scientific Conference on Electric Power Engineering (EPE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126173607","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
Industrial Uniterruptible Power Supply Batteries Monitoring Augmentation by Infrared Camera 红外摄像机在工业不间断电源电池监测中的应用
2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8777953
T. Sikora, L. Prokop, J. Fulneček, Tomáš Vantuch
{"title":"Industrial Uniterruptible Power Supply Batteries Monitoring Augmentation by Infrared Camera","authors":"T. Sikora, L. Prokop, J. Fulneček, Tomáš Vantuch","doi":"10.1109/EPE.2019.8777953","DOIUrl":"https://doi.org/10.1109/EPE.2019.8777953","url":null,"abstract":"Uninterruptible power supplies (UPSs) are vital for different industries. Along with a rise in their complexity, the requirements for a UPS become more important. UPSs are meant to protect technologies from damage caused by various interruptions of an electric power supply. Advanced monitoring of UPS ensured by a battery management system (BMS) is able to prevent from more serious damage thanks to a mechanism of in-time and accurate battery-fault detection, which is based on voltage metering. This mechanism is widely used, but its use gets very expensive. This also poses an obstacle in the further applications of the battery systems. This paper gives an overview of Czech national standards aimed at batteries used in industrial UPSs. As the temperature is the second key indicator of a battery's health, the battery voltage being the first, our research aims to develop a low-cost UPS monitoring system using infrared thermographic measurements. The research builds on an assumption that overheating of a battery implies a state of damage. The paper describes the design of an extended automatized metering platform.","PeriodicalId":117212,"journal":{"name":"2019 20th International Scientific Conference on Electric Power Engineering (EPE)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131358270","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
Decomposition of the load's current supplied from a sinusoidal and asymmetrical voltage source in accordance with the Currents' Physical Components (CPC) Theory 根据电流物理分量(CPC)理论，分解由正弦和不对称电压源提供的负载电流
2019 20th International Scientific Conference on Electric Power Engineering (EPE) Pub Date : 2019-05-01 DOI: 10.1109/EPE.2019.8778034
Zbigniew Sołjan, Grzegorz Hołdyński, M. Zajkowski
{"title":"Decomposition of the load's current supplied from a sinusoidal and asymmetrical voltage source in accordance with the Currents' Physical Components (CPC) Theory","authors":"Zbigniew Sołjan, Grzegorz Hołdyński, M. Zajkowski","doi":"10.1109/EPE.2019.8778034","DOIUrl":"https://doi.org/10.1109/EPE.2019.8778034","url":null,"abstract":"The subject of this article is to exhibit the possibility of describing three-phase circuits powered from an asymmetric sinusoidal voltage source. Determining the physical components of the current associated closely with specific physical phenomena makes it possible to distinguish the components of unbalanced from the active and reactive components. Each of these currents, excluding the active current, contributes to the power of unbalanced and reactive power, which should be minimized or completely removed from the circuit.","PeriodicalId":117212,"journal":{"name":"2019 20th International Scientific Conference on Electric Power Engineering (EPE)","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130151803","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
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