Pub Date : 2017-05-01DOI: 10.1109/EPE.2017.7967246
Jan Otýpka, P. Pečínka, P. Orság, V. Stýskala
This paper deals with analysis of induction motor fed by non-harmonic voltage source. The losses are determined based on direct method for analysis of motor efficiency. The method is presented for fractional losses analysis with consideration harmonics generated by PMW. The introduced method earmarks the fundamental harmonic components of electrical magnitudes for comparison purposes of different harmonic and non-harmonic sourcing types. The motor losses harmonic effect influence is demonstrated on measuring case of induction motor fed by grid and PWM converter.
{"title":"The influence of nonharmonic voltage source on losses in induction motor","authors":"Jan Otýpka, P. Pečínka, P. Orság, V. Stýskala","doi":"10.1109/EPE.2017.7967246","DOIUrl":"https://doi.org/10.1109/EPE.2017.7967246","url":null,"abstract":"This paper deals with analysis of induction motor fed by non-harmonic voltage source. The losses are determined based on direct method for analysis of motor efficiency. The method is presented for fractional losses analysis with consideration harmonics generated by PMW. The introduced method earmarks the fundamental harmonic components of electrical magnitudes for comparison purposes of different harmonic and non-harmonic sourcing types. The motor losses harmonic effect influence is demonstrated on measuring case of induction motor fed by grid and PWM converter.","PeriodicalId":201464,"journal":{"name":"2017 18th International Scientific Conference on Electric Power Engineering (EPE)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116243018","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}
Pub Date : 2017-05-01DOI: 10.1109/EPE.2017.7967227
A. Gawlak, L. Poniatowski
The paper discusses the influence of prosumers on power and energy losses in a low-voltage (LV) network. The essential criteria are stated of connecting microgeneration plants to the LV network.
本文讨论了产用户对低压电网功率损耗和能量损耗的影响。阐述了微型发电厂接入低压电网的基本准则。
{"title":"Power and energy losses in low-voltage overhead lines with prosumer microgeneration plants","authors":"A. Gawlak, L. Poniatowski","doi":"10.1109/EPE.2017.7967227","DOIUrl":"https://doi.org/10.1109/EPE.2017.7967227","url":null,"abstract":"The paper discusses the influence of prosumers on power and energy losses in a low-voltage (LV) network. The essential criteria are stated of connecting microgeneration plants to the LV network.","PeriodicalId":201464,"journal":{"name":"2017 18th International Scientific Conference on Electric Power Engineering (EPE)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126918525","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}
Pub Date : 2017-05-01DOI: 10.1109/EPE.2017.7967265
P. Valenta, V. Koucký, J. Hammerbauer
This paper describes auxiliary power supply for supplying high-side MOSFET driver using piezoelectric transformer. The proposed circuit consists of the piezoelectric transformer and driving circuit. The circuit allows 100% duty cycle of the high side MOSFET driver. Used piezoelectric transformer works in radial vibration mode. To verify the power supply function the full bridge convertor was used. The experimental results are presented.
{"title":"Piezoelectric transformer for high-side MOSFET driver supplying","authors":"P. Valenta, V. Koucký, J. Hammerbauer","doi":"10.1109/EPE.2017.7967265","DOIUrl":"https://doi.org/10.1109/EPE.2017.7967265","url":null,"abstract":"This paper describes auxiliary power supply for supplying high-side MOSFET driver using piezoelectric transformer. The proposed circuit consists of the piezoelectric transformer and driving circuit. The circuit allows 100% duty cycle of the high side MOSFET driver. Used piezoelectric transformer works in radial vibration mode. To verify the power supply function the full bridge convertor was used. The experimental results are presented.","PeriodicalId":201464,"journal":{"name":"2017 18th International Scientific Conference on Electric Power Engineering (EPE)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126923860","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}
Pub Date : 2017-05-01DOI: 10.1109/EPE.2017.7967276
B. Sánchez, M. Váry, M. Perný, F. Janiček, V. Šály, J. Packa
The aim of this work is the evaluation of the data obtained from experimental PV solar system performance. 500 Wp PV system is installed on the roof of Faculty of Electrical Engineering and Information Technology of Slovak University of Technology in Bratislava, Slovakia. In addition the obtained results are compared with the PVGIS simulation. A brief summary of components and construction parts of photovoltaic system, description of the individual elements forming the system (photovoltaic modules, the inverters and the equipment of measuring and data processing) is given. The electrical parameters of PV system and irradiation intensity which allows the calculation of efficiency during the operation of PV grid connected systems are measured. Moreover, the measurements of weather and environmental factors like temperature and other (humidity and air pressure, wind speed) have been continuously done. Detailed analyses under different operating conditions, performing some monthly and daily analysis and comparing them with solar radiation database from climatologic data homogenized for Europe (PVGIS) were performed.
{"title":"Prediction and production of small PV power plant","authors":"B. Sánchez, M. Váry, M. Perný, F. Janiček, V. Šály, J. Packa","doi":"10.1109/EPE.2017.7967276","DOIUrl":"https://doi.org/10.1109/EPE.2017.7967276","url":null,"abstract":"The aim of this work is the evaluation of the data obtained from experimental PV solar system performance. 500 Wp PV system is installed on the roof of Faculty of Electrical Engineering and Information Technology of Slovak University of Technology in Bratislava, Slovakia. In addition the obtained results are compared with the PVGIS simulation. A brief summary of components and construction parts of photovoltaic system, description of the individual elements forming the system (photovoltaic modules, the inverters and the equipment of measuring and data processing) is given. The electrical parameters of PV system and irradiation intensity which allows the calculation of efficiency during the operation of PV grid connected systems are measured. Moreover, the measurements of weather and environmental factors like temperature and other (humidity and air pressure, wind speed) have been continuously done. Detailed analyses under different operating conditions, performing some monthly and daily analysis and comparing them with solar radiation database from climatologic data homogenized for Europe (PVGIS) were performed.","PeriodicalId":201464,"journal":{"name":"2017 18th International Scientific Conference on Electric Power Engineering (EPE)","volume":"5 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133650601","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}
Pub Date : 2017-05-01DOI: 10.1109/EPE.2017.7967248
Sowiński Janusz, Szydłowski Mateusz
In the balance section Electricity supply, the output quantities are electrical energy and heat generated in heat plants and in combined heat and power plants whereas the input quantities are primary and secondary energy carriers. In the recent years, new sources of primary energy, mostly renewable, appeared next to traditional fuels. In the modelling of energy transformation, energy carriers are treated as endogenous variables and it is postulated that electrical energy generation should be treated as an exogenous variable. An exogenous variable can be introduced as a scenario or it can be stated as a result of a chronological series forecast. Modern forecasting methods employ time series with a large number of samples. The paper presents a method for preparing this variable on the basis of a description of load variation in the power system. The method can yield forecasts at monthly intervals, with the forecasting process using adaptive neuro-fuzzy inference system (ANFIS).
{"title":"Forecast of electricity supply using adaptive neuro-fuzzy inference system","authors":"Sowiński Janusz, Szydłowski Mateusz","doi":"10.1109/EPE.2017.7967248","DOIUrl":"https://doi.org/10.1109/EPE.2017.7967248","url":null,"abstract":"In the balance section Electricity supply, the output quantities are electrical energy and heat generated in heat plants and in combined heat and power plants whereas the input quantities are primary and secondary energy carriers. In the recent years, new sources of primary energy, mostly renewable, appeared next to traditional fuels. In the modelling of energy transformation, energy carriers are treated as endogenous variables and it is postulated that electrical energy generation should be treated as an exogenous variable. An exogenous variable can be introduced as a scenario or it can be stated as a result of a chronological series forecast. Modern forecasting methods employ time series with a large number of samples. The paper presents a method for preparing this variable on the basis of a description of load variation in the power system. The method can yield forecasts at monthly intervals, with the forecasting process using adaptive neuro-fuzzy inference system (ANFIS).","PeriodicalId":201464,"journal":{"name":"2017 18th International Scientific Conference on Electric Power Engineering (EPE)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122965011","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}
Pub Date : 2017-05-01DOI: 10.1109/EPE.2017.7967322
B. Silva, G. Furriel, Wesley Calixto Pacheco, Júnio S. Bulhões
The purpose of this work is to develop devices capable of identifying sign language characters and comparing them in order to verify layout with better accuracy and robustness. The recognition is performed using Artificial Neural Networks and all the input data are signals from flex sensors, accelerometers and gyroscopes, positioned differently on each device. After being trained, validated and tested, the network reachs hit rate about 95.8%. It is proposed as solution to deaf people's accessibility and presents as layout proposal for the development of new devices for recognition of signals that express complete words and phrases.
{"title":"Methodology and comparison of devices for recognition of sign language characters","authors":"B. Silva, G. Furriel, Wesley Calixto Pacheco, Júnio S. Bulhões","doi":"10.1109/EPE.2017.7967322","DOIUrl":"https://doi.org/10.1109/EPE.2017.7967322","url":null,"abstract":"The purpose of this work is to develop devices capable of identifying sign language characters and comparing them in order to verify layout with better accuracy and robustness. The recognition is performed using Artificial Neural Networks and all the input data are signals from flex sensors, accelerometers and gyroscopes, positioned differently on each device. After being trained, validated and tested, the network reachs hit rate about 95.8%. It is proposed as solution to deaf people's accessibility and presents as layout proposal for the development of new devices for recognition of signals that express complete words and phrases.","PeriodicalId":201464,"journal":{"name":"2017 18th International Scientific Conference on Electric Power Engineering (EPE)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128517858","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}
Pub Date : 2017-05-01DOI: 10.1109/EPE.2017.7967252
J. Herlender, J. Izykowski
In this paper, the evaluation of the concept of impedance differential scheme for long transmission line protection is presented. Using the voltages and currents of both line ends, the differential impedance is calculated. Capacitive charging current which constitutes the main drawback of current differential protection is eliminated in presented protection method. What is more, the advantage of presented impedance differential protection is ability to determine the fault location. For evaluating the validity of considered protection scheme, computer simulation based on ATP-EMTP was carried out. The obtained results approve the high reliability of the impedance differential protection.
{"title":"Impedance-differential protective algorithm for long power transmission lines","authors":"J. Herlender, J. Izykowski","doi":"10.1109/EPE.2017.7967252","DOIUrl":"https://doi.org/10.1109/EPE.2017.7967252","url":null,"abstract":"In this paper, the evaluation of the concept of impedance differential scheme for long transmission line protection is presented. Using the voltages and currents of both line ends, the differential impedance is calculated. Capacitive charging current which constitutes the main drawback of current differential protection is eliminated in presented protection method. What is more, the advantage of presented impedance differential protection is ability to determine the fault location. For evaluating the validity of considered protection scheme, computer simulation based on ATP-EMTP was carried out. The obtained results approve the high reliability of the impedance differential protection.","PeriodicalId":201464,"journal":{"name":"2017 18th International Scientific Conference on Electric Power Engineering (EPE)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126262980","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}
Pub Date : 2017-05-01DOI: 10.1109/EPE.2017.7967338
A. Havel, M. Sobek, Petr Chamrád
Trend of increasing the share of electricity production from the renewable energy sources will surely continue the in the upcoming time period. This paper outlines multiple solutions of accumulation of energy, especially electricity, in the Technology Center of Ostrava (TCO). It presents solutions for storage of electrical energy into the batteries with use of power converters with an additional function of active power filtering. The paper aims primarily to familiarize the reader with the methods of controlling power converters at the basic level. It deals with the current and power regulation of individual inverters and their concepts, but not on their superior management, decision-making and control processes around the technology center.
{"title":"Control methods of modern systems utilizing accumulation of electrical energy","authors":"A. Havel, M. Sobek, Petr Chamrád","doi":"10.1109/EPE.2017.7967338","DOIUrl":"https://doi.org/10.1109/EPE.2017.7967338","url":null,"abstract":"Trend of increasing the share of electricity production from the renewable energy sources will surely continue the in the upcoming time period. This paper outlines multiple solutions of accumulation of energy, especially electricity, in the Technology Center of Ostrava (TCO). It presents solutions for storage of electrical energy into the batteries with use of power converters with an additional function of active power filtering. The paper aims primarily to familiarize the reader with the methods of controlling power converters at the basic level. It deals with the current and power regulation of individual inverters and their concepts, but not on their superior management, decision-making and control processes around the technology center.","PeriodicalId":201464,"journal":{"name":"2017 18th International Scientific Conference on Electric Power Engineering (EPE)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126082260","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}
Pub Date : 2017-05-01DOI: 10.1109/EPE.2017.7967250
J. Hornak, P. Kadlec, P. Totzauer, P. Trnka, M. Gutten
Composite insulation systems are inseparable part of most electrical installations. Strongly inhomogeneous structure of these systems is the main problem which may lead to defect during operation life. Main aim of this paper is to introduce novel composite material designed for insulating system of high voltage equipment. This material is composed of epoxy resin matrix with dispersed magnesium oxide (MgO) nanoparticles and polyethylene naphthalate (PEN) film. The main emphasize is placed on behaviour of this material in AC electric field depending on frequency of testing voltage and ambient temperature and also on the behaviour in DC field. The characterization in AC field is based on broadband dielectric spectroscopy, on the other hand the behaviour in DC field is characterized by dielectric absorption. Parameters like real permittivity, loss factor and dielectric absorption and resorption are mentioned in this paper.
{"title":"Dielectric spectroscopy and absorption/resorption analysis of composite dielectric with MgO filler","authors":"J. Hornak, P. Kadlec, P. Totzauer, P. Trnka, M. Gutten","doi":"10.1109/EPE.2017.7967250","DOIUrl":"https://doi.org/10.1109/EPE.2017.7967250","url":null,"abstract":"Composite insulation systems are inseparable part of most electrical installations. Strongly inhomogeneous structure of these systems is the main problem which may lead to defect during operation life. Main aim of this paper is to introduce novel composite material designed for insulating system of high voltage equipment. This material is composed of epoxy resin matrix with dispersed magnesium oxide (MgO) nanoparticles and polyethylene naphthalate (PEN) film. The main emphasize is placed on behaviour of this material in AC electric field depending on frequency of testing voltage and ambient temperature and also on the behaviour in DC field. The characterization in AC field is based on broadband dielectric spectroscopy, on the other hand the behaviour in DC field is characterized by dielectric absorption. Parameters like real permittivity, loss factor and dielectric absorption and resorption are mentioned in this paper.","PeriodicalId":201464,"journal":{"name":"2017 18th International Scientific Conference on Electric Power Engineering (EPE)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116988085","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}
Pub Date : 2017-05-01DOI: 10.1109/EPE.2017.7967290
Michal Krbal, Jaroslav Štěpánek, Vojtěch Wasserbauer, J. Orságová, Stanislav Sumec
This paper is focused on the description of phenomenon called "floating water bridge" and several experiments in our high voltage laboratory which are joined with this phenomenon. Water bridges bring some new knowledge in chemistry, electrochemistry, lighting technology and high voltage field. In this paper we will be dedicated space for describing the properties of water bridges in the area of the measurement of electrical parameters and interaction of electric and magnetic fields. Currently the research in this area is new and rapidly developing. However water bridges offer the great potential for the future in plasma research and current measurement with galvanic separation.
{"title":"Floating water bridge phenomenon high voltage laboratory experimens","authors":"Michal Krbal, Jaroslav Štěpánek, Vojtěch Wasserbauer, J. Orságová, Stanislav Sumec","doi":"10.1109/EPE.2017.7967290","DOIUrl":"https://doi.org/10.1109/EPE.2017.7967290","url":null,"abstract":"This paper is focused on the description of phenomenon called \"floating water bridge\" and several experiments in our high voltage laboratory which are joined with this phenomenon. Water bridges bring some new knowledge in chemistry, electrochemistry, lighting technology and high voltage field. In this paper we will be dedicated space for describing the properties of water bridges in the area of the measurement of electrical parameters and interaction of electric and magnetic fields. Currently the research in this area is new and rapidly developing. However water bridges offer the great potential for the future in plasma research and current measurement with galvanic separation.","PeriodicalId":201464,"journal":{"name":"2017 18th International Scientific Conference on Electric Power Engineering (EPE)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121692417","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}
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