Pub Date : 2016-10-01DOI: 10.1109/RTUCON.2016.7763079
A. Fomin, M. Fomina
Heat treatment of experimental titanium samples using high frequency currents is studied. The velocity of heating is determined depending on the current value on the inductor. Experimental results are compared to the data of finite element method (FEM) modeling of heat transfer in metallic products. The peculiarities of the heating of cylindrical designs of two types: I (diameter - 3.75 mm, length - 10 mm) and Π (diameter - 3.95 mm, length - 62.5 mm) implanted into the bone tissue were studied. The temperature of the constructional elements of different implant parts was calculated.
{"title":"FEM modeling and experimental data of induction heating of titanium medical devices","authors":"A. Fomin, M. Fomina","doi":"10.1109/RTUCON.2016.7763079","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763079","url":null,"abstract":"Heat treatment of experimental titanium samples using high frequency currents is studied. The velocity of heating is determined depending on the current value on the inductor. Experimental results are compared to the data of finite element method (FEM) modeling of heat transfer in metallic products. The peculiarities of the heating of cylindrical designs of two types: I (diameter - 3.75 mm, length - 10 mm) and Π (diameter - 3.95 mm, length - 62.5 mm) implanted into the bone tissue were studied. The temperature of the constructional elements of different implant parts was calculated.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131250615","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 : 2016-10-01DOI: 10.1109/RTUCON.2016.7763118
E. Liivik, A. Chub, D. Vinnikov
Single-switch converters can be an attractive solution for low-cost and low-power applications. This paper studies efficiency improvements from topology modifications of the single-switch galvanically isolated quasi-Z-source DC-DC converter. The following approaches were studied: synchronous rectification in the quasi-Z-source network, implementation of a voltage multiplier rectifier and the multidevice switching stage, and elimination of the DC blocking capacitor from the primary winding of the isolation transformer. To evaluate the performance improvement, the efficiency was measured for all approaches in a wide input voltage and power range. It was shown that thanks to the proposed modifications, the peak efficiency of the single-switch galvanically isolated quasi-Z-source DC-DC converter was increased to 95.5%, which includes the auxiliary power and control system losses.
{"title":"Efficiency improvement from topology modification of the single-switch isolated quasi-Z-source DC-DC converter","authors":"E. Liivik, A. Chub, D. Vinnikov","doi":"10.1109/RTUCON.2016.7763118","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763118","url":null,"abstract":"Single-switch converters can be an attractive solution for low-cost and low-power applications. This paper studies efficiency improvements from topology modifications of the single-switch galvanically isolated quasi-Z-source DC-DC converter. The following approaches were studied: synchronous rectification in the quasi-Z-source network, implementation of a voltage multiplier rectifier and the multidevice switching stage, and elimination of the DC blocking capacitor from the primary winding of the isolation transformer. To evaluate the performance improvement, the efficiency was measured for all approaches in a wide input voltage and power range. It was shown that thanks to the proposed modifications, the peak efficiency of the single-switch galvanically isolated quasi-Z-source DC-DC converter was increased to 95.5%, which includes the auxiliary power and control system losses.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133353824","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 : 2016-10-01DOI: 10.1109/RTUCON.2016.7763141
M. Borisova, Julia K. Osina
The absorption charging Ich and discharging Idis currents of the cable polyethylene insulation before and after thermal aging were investigated experimentally. These data are analyzed on the basis of two physics models which correspond to Maxwell and Voigt equivalent circuits. The aim of the work is to show that measurements of absorption characteristics are nondestructive diagnostic method of electrical insulation of cables.
{"title":"The absorbtion and low-frequency dielectric characteristics of the cross-linked polyethylene insulation for power cables","authors":"M. Borisova, Julia K. Osina","doi":"10.1109/RTUCON.2016.7763141","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763141","url":null,"abstract":"The absorption charging Ich and discharging Idis currents of the cable polyethylene insulation before and after thermal aging were investigated experimentally. These data are analyzed on the basis of two physics models which correspond to Maxwell and Voigt equivalent circuits. The aim of the work is to show that measurements of absorption characteristics are nondestructive diagnostic method of electrical insulation of cables.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134168512","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 : 2016-10-01DOI: 10.1109/RTUCON.2016.7763104
V. Bezrukovs, A. Zacepins, V. Bezrukovs, D. Bezrukovs
The paper presents the assessment of power production efficiency of five wind turbine generator types in low-wind conditions typical for Latvia. The analysis considers wind turbines manufactured by the leading European producers - Nordex, Vestas, Enercon and Siemens. The study is based on 10-min measurements of wind speed from two on-shore sites in the north and north-west of Latvia using LOGGER 9200 Symphonie measurement systems mounted on met-masts. Based on the measurement analysis results, wind speed distribution curves are modelled for the heights of up to 150 m using power law approximation methods. The forecast of Annual Energy Production (AEP) is performed using the Weibull frequency distribution of wind speed for two heights for each corresponding wind turbine type. The results of the analysis show that the highest output efficiency can be achieved by Vestas and Nordex wind turbines, which power curves correspond to wind class III. Vestas V136-3.45 with hub height 132 m achieves maximum efficiency equal to 54.5% in Irbene site. For Enercon E101 and Siemens SWT-3.2-113, SWT-2.3-108 WTs, which are designed for wind class II, the values of the efficiency coefficient do not exceed 47.3% for hub height 142 m.
{"title":"Forecasting of wind turbine efficiency in Latvia by long-term wind speed measurements","authors":"V. Bezrukovs, A. Zacepins, V. Bezrukovs, D. Bezrukovs","doi":"10.1109/RTUCON.2016.7763104","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763104","url":null,"abstract":"The paper presents the assessment of power production efficiency of five wind turbine generator types in low-wind conditions typical for Latvia. The analysis considers wind turbines manufactured by the leading European producers - Nordex, Vestas, Enercon and Siemens. The study is based on 10-min measurements of wind speed from two on-shore sites in the north and north-west of Latvia using LOGGER 9200 Symphonie measurement systems mounted on met-masts. Based on the measurement analysis results, wind speed distribution curves are modelled for the heights of up to 150 m using power law approximation methods. The forecast of Annual Energy Production (AEP) is performed using the Weibull frequency distribution of wind speed for two heights for each corresponding wind turbine type. The results of the analysis show that the highest output efficiency can be achieved by Vestas and Nordex wind turbines, which power curves correspond to wind class III. Vestas V136-3.45 with hub height 132 m achieves maximum efficiency equal to 54.5% in Irbene site. For Enercon E101 and Siemens SWT-3.2-113, SWT-2.3-108 WTs, which are designed for wind class II, the values of the efficiency coefficient do not exceed 47.3% for hub height 142 m.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121391177","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 : 2016-10-01DOI: 10.1109/RTUCON.2016.7763094
G. Khudyakova
In this paper the method of optimal placement of distributed generation sources to improve the electricity supply reliability is viewed. A mathematical model of multiobjective optimal placement of distributed generation sources is developed. The results and analysis of test calculations for the proposed model are cited.
{"title":"Method of optimal placement of distributed generation sources in order to improve the reliability of power supply","authors":"G. Khudyakova","doi":"10.1109/RTUCON.2016.7763094","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763094","url":null,"abstract":"In this paper the method of optimal placement of distributed generation sources to improve the electricity supply reliability is viewed. A mathematical model of multiobjective optimal placement of distributed generation sources is developed. The results and analysis of test calculations for the proposed model are cited.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122614426","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 : 2016-10-01DOI: 10.1109/RTUCON.2016.7763157
A. Anuchin, D. Shpak, D. Aliamkin, F. Briz
In this paper an adaptive rotor flux observer is developed. This observer performs a real-time correction of the mutual inductance and rotor resistance of the motor using data from the DC-link voltage sensor, the inverter state and the phase current and position sensors. The observer compares the behavior of two independent observers (sensorless and sensored observers) in order to correct the parameters of the sensored observer. The adaptation algorithm corrects the mutual inductance, which can vary due to change of the magnetization current, and the rotor resistance, which can change due to variation of the rotor temperature. Computer simulation results are presented to validate the proposed method.
{"title":"Adaptive observer for field oriented control systems of induction motors","authors":"A. Anuchin, D. Shpak, D. Aliamkin, F. Briz","doi":"10.1109/RTUCON.2016.7763157","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763157","url":null,"abstract":"In this paper an adaptive rotor flux observer is developed. This observer performs a real-time correction of the mutual inductance and rotor resistance of the motor using data from the DC-link voltage sensor, the inverter state and the phase current and position sensors. The observer compares the behavior of two independent observers (sensorless and sensored observers) in order to correct the parameters of the sensored observer. The adaptation algorithm corrects the mutual inductance, which can vary due to change of the magnetization current, and the rotor resistance, which can change due to variation of the rotor temperature. Computer simulation results are presented to validate the proposed method.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123892623","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 : 2016-10-01DOI: 10.1109/RTUCON.2016.7763085
A. Patlins
This article deals with devices concept development for mechanical/electrical power conversion visualization for promoting applied physics in public transport vehicles for fitness and health of passengers as well as in education purposes. Article shows significance of active way of life and dangerous tendencies in modern society. Author offer to use pedal power for transferring of energy from a human source through the use of a foot pedal to electricity for charging mobile devices. As well as, this device can be good equipment for public transport vehicles passengers, to make their lifestyle more active, so can help to make health better and to minimize health risks.
{"title":"Mechanical/electrical power conversion visualization for promoting applied physics and engineering in intellectual transport system","authors":"A. Patlins","doi":"10.1109/RTUCON.2016.7763085","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763085","url":null,"abstract":"This article deals with devices concept development for mechanical/electrical power conversion visualization for promoting applied physics in public transport vehicles for fitness and health of passengers as well as in education purposes. Article shows significance of active way of life and dangerous tendencies in modern society. Author offer to use pedal power for transferring of energy from a human source through the use of a foot pedal to electricity for charging mobile devices. As well as, this device can be good equipment for public transport vehicles passengers, to make their lifestyle more active, so can help to make health better and to minimize health risks.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"2003 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129610220","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 : 2016-10-01DOI: 10.1109/RTUCON.2016.7763140
Armands Senfelds, O. Bormanis, Arturs Paugurs
Method of estimating optimal power supply performance parameters with comparison of two different power measurement data analysis methods is introduced. Application of estimating optimal infeed supply converter performance parameters for industrial DC microgrid with multiple DC supplied industrial manipulators and an spot welding process has been analyzed.
{"title":"Analytical approach for industrial microgrid infeed peak power dimensioning","authors":"Armands Senfelds, O. Bormanis, Arturs Paugurs","doi":"10.1109/RTUCON.2016.7763140","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763140","url":null,"abstract":"Method of estimating optimal power supply performance parameters with comparison of two different power measurement data analysis methods is introduced. Application of estimating optimal infeed supply converter performance parameters for industrial DC microgrid with multiple DC supplied industrial manipulators and an spot welding process has been analyzed.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124630040","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 : 2016-10-01DOI: 10.1109/RTUCON.2016.7763077
K. Vītols
This paper is intended as the second part of a two paper series that evaluate the efficiency of a battery pack with charger that has an integrated cell balancing solution. In the first paper a simple passive balancing with a half bridge charger was designed and tested for energy efficiency. This paper continues the work by redesigning the half bridge charger circuit to implement a multi secondary winding transformer balancing circuit. The designed active balancing circuit splits the battery pack in four sections - each section is balanced actively. Each of the sections contains five cells which use the same passive balancing as before. The result is a mixed two level balancing circuit that is integrated in the charger topology. The battery pack with the charger/balancing circuit has been tested to obtain energy efficiency measurements which are compared with the previously obtained passive balancing measurements.
{"title":"Efficiency of LiFePO4 battery and charger with a mixed two level balancing","authors":"K. Vītols","doi":"10.1109/RTUCON.2016.7763077","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763077","url":null,"abstract":"This paper is intended as the second part of a two paper series that evaluate the efficiency of a battery pack with charger that has an integrated cell balancing solution. In the first paper a simple passive balancing with a half bridge charger was designed and tested for energy efficiency. This paper continues the work by redesigning the half bridge charger circuit to implement a multi secondary winding transformer balancing circuit. The designed active balancing circuit splits the battery pack in four sections - each section is balanced actively. Each of the sections contains five cells which use the same passive balancing as before. The result is a mixed two level balancing circuit that is integrated in the charger topology. The battery pack with the charger/balancing circuit has been tested to obtain energy efficiency measurements which are compared with the previously obtained passive balancing measurements.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116165958","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 : 2016-10-01DOI: 10.1109/RTUCON.2016.7763151
M. Gorobetz, A. Levchenkov
This paper provides the education technique for students of Computer Control of Electrical Technology specialty of Riga Technical University. This method is used for creation of the ordinal scales, grouping and evaluation of students work during the whole semester in software-oriented subjects. The special website is developed to organize data collection, data analysis and feedback from students. It is successfully used during the last eight years and allows controlling and objectively evaluating students' results by multiple criteria.
{"title":"Ordinal scales and feedbacks in educational process of computer control of electrical technology","authors":"M. Gorobetz, A. Levchenkov","doi":"10.1109/RTUCON.2016.7763151","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763151","url":null,"abstract":"This paper provides the education technique for students of Computer Control of Electrical Technology specialty of Riga Technical University. This method is used for creation of the ordinal scales, grouping and evaluation of students work during the whole semester in software-oriented subjects. The special website is developed to organize data collection, data analysis and feedback from students. It is successfully used during the last eight years and allows controlling and objectively evaluating students' results by multiple criteria.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126834866","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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