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.2017.7967266
P. Pečínka, S. Kocman, P. Orság, Jan Otýpka
This paper presents possibilities to increase the efficiency of three-phase squirrel cage induction motors. The necessary legislative requirements are stated in the first part of the paper, which are basically the main reason for efficiency increasing. After that a theoretical basis and explanation of the design for efficiency increasing follow. The final part presents the results of measurements on the concrete samples of induction motors of different efficiency classes, their comparison, evaluation and comparison with the limits prescribed by the relevant standards.
{"title":"Solutions to increase the efficiency of induction motors","authors":"P. Pečínka, S. Kocman, P. Orság, Jan Otýpka","doi":"10.1109/EPE.2017.7967266","DOIUrl":"https://doi.org/10.1109/EPE.2017.7967266","url":null,"abstract":"This paper presents possibilities to increase the efficiency of three-phase squirrel cage induction motors. The necessary legislative requirements are stated in the first part of the paper, which are basically the main reason for efficiency increasing. After that a theoretical basis and explanation of the design for efficiency increasing follow. The final part presents the results of measurements on the concrete samples of induction motors of different efficiency classes, their comparison, evaluation and comparison with the limits prescribed by the relevant standards.","PeriodicalId":201464,"journal":{"name":"2017 18th International Scientific Conference on Electric Power Engineering (EPE)","volume":"53 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":"114719054","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}
Pub Date : 2017-05-01DOI: 10.1109/EPE.2017.7967336
Vladislav Síťař, Jan Veleba, Karel Nohac
This paper describes procedures for modelling of two-winding off-load tap-changing transformers in two alternative simulation tools for load flow analysis — DYNAST and SimEPS. For both softwares, respective transformer models and other necessary simulation steps are introduced. Determination of all input parameters is presented along with the verification of results for single-phase transformer model in DYNAST when compared to measurement data. DYNAST is able to perform simulations by using physical diagrams, which are not standardly used for load flow analysis. However, it can also solve one-phase problems or even three-phase problems with real physical coupling. SimEPS models the load flow problem strictly by the system of equations and uses advanced computational algorithms to obtain highly accurate solutions. Load flow results from both softwares are compared and simulation errors evaluated for selected operational states of rather simple power systems.
{"title":"Load flow analysis using transformer models in alternative simulation tools","authors":"Vladislav Síťař, Jan Veleba, Karel Nohac","doi":"10.1109/EPE.2017.7967336","DOIUrl":"https://doi.org/10.1109/EPE.2017.7967336","url":null,"abstract":"This paper describes procedures for modelling of two-winding off-load tap-changing transformers in two alternative simulation tools for load flow analysis — DYNAST and SimEPS. For both softwares, respective transformer models and other necessary simulation steps are introduced. Determination of all input parameters is presented along with the verification of results for single-phase transformer model in DYNAST when compared to measurement data. DYNAST is able to perform simulations by using physical diagrams, which are not standardly used for load flow analysis. However, it can also solve one-phase problems or even three-phase problems with real physical coupling. SimEPS models the load flow problem strictly by the system of equations and uses advanced computational algorithms to obtain highly accurate solutions. Load flow results from both softwares are compared and simulation errors evaluated for selected operational states of rather simple power systems.","PeriodicalId":201464,"journal":{"name":"2017 18th International Scientific Conference on Electric Power Engineering (EPE)","volume":"25 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":"116730892","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.2017.7967282
Tomáš Mozdřeň, S. Rusek, R. Goňo, Veleslav Mach
This paper describes the analysis of power generating units and their implementation, these are located within the technological centre in Ostrava-Vitkovice. Further issues concerned in this paper deal with digital simulation using computer model created using the EMTP — ATP software to evaluate particular process courses that may occur on the power inverter installed in the technological centre. The data summarised in this paper will serve mainly as input details for development of a dynamic model. The data from this digital model will be then compared to the values measured on the real power inverter.
{"title":"Analysis of properties of power inverter digital model at the ENET technological centre","authors":"Tomáš Mozdřeň, S. Rusek, R. Goňo, Veleslav Mach","doi":"10.1109/EPE.2017.7967282","DOIUrl":"https://doi.org/10.1109/EPE.2017.7967282","url":null,"abstract":"This paper describes the analysis of power generating units and their implementation, these are located within the technological centre in Ostrava-Vitkovice. Further issues concerned in this paper deal with digital simulation using computer model created using the EMTP — ATP software to evaluate particular process courses that may occur on the power inverter installed in the technological centre. The data summarised in this paper will serve mainly as input details for development of a dynamic model. The data from this digital model will be then compared to the values measured on the real power inverter.","PeriodicalId":201464,"journal":{"name":"2017 18th International Scientific Conference on Electric Power Engineering (EPE)","volume":"69 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":"125513155","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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