Induction machines are nowadays used also in electric drives with high demands on dynamic properties. However their control strategies usually need a mathematical model of the machine with a set of parameters. Obtaining of these parameters can be done by laboratory procedures but in-field procedures are more favorable due to potential savings in time and financial costs. This paper proposes an off-line parameter identification method that is suitable for self-commissioning of an electric drive in cases when machine and converter comes from different producers. The method is carried out entirely by means of a standard power inverter only by impressed stator voltages.
{"title":"Induction machine parameters identification method suitable for self-commissioning","authors":"Tomas Kostal","doi":"10.1109/ET.2017.8124357","DOIUrl":"https://doi.org/10.1109/ET.2017.8124357","url":null,"abstract":"Induction machines are nowadays used also in electric drives with high demands on dynamic properties. However their control strategies usually need a mathematical model of the machine with a set of parameters. Obtaining of these parameters can be done by laboratory procedures but in-field procedures are more favorable due to potential savings in time and financial costs. This paper proposes an off-line parameter identification method that is suitable for self-commissioning of an electric drive in cases when machine and converter comes from different producers. The method is carried out entirely by means of a standard power inverter only by impressed stator voltages.","PeriodicalId":127983,"journal":{"name":"2017 XXVI International Scientific Conference Electronics (ET)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115753272","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}
S. Sadinov, K. Angelov, P. Kogias, M. Malamatoudis
Optical WDM networks use high-speed optical trunk lines as backbone network. The maximum number of amplifying sections in the optical line is causally related to power budget, dispersive expansion of code pulses and nonlinear distortions. All parameters are closely correlated. Total signal losses are estimated and through series of iterations a solution is found which for a given number of amplifying sections for the current iteration will yield minimum relative percentage error. A simulation model is developed to validate the proposed approach.
{"title":"Iterative estimation and simulation analysis of the amplifying sections in optical communication network","authors":"S. Sadinov, K. Angelov, P. Kogias, M. Malamatoudis","doi":"10.1109/ET.2017.8124385","DOIUrl":"https://doi.org/10.1109/ET.2017.8124385","url":null,"abstract":"Optical WDM networks use high-speed optical trunk lines as backbone network. The maximum number of amplifying sections in the optical line is causally related to power budget, dispersive expansion of code pulses and nonlinear distortions. All parameters are closely correlated. Total signal losses are estimated and through series of iterations a solution is found which for a given number of amplifying sections for the current iteration will yield minimum relative percentage error. A simulation model is developed to validate the proposed approach.","PeriodicalId":127983,"journal":{"name":"2017 XXVI International Scientific Conference Electronics (ET)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117159159","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}
S. Andreev, K. Chernyakova, B. Tzaneva, V. Videkov, I. Vrublevsky
The paper presents the results of studies of thermal characteristics of nanoporous anodic alumina layer formed in sulphuric acid. One-sided heating of aluminum boards by heating element from carbon filament was used. The temperature of the back side of the board was kept constant by using an aluminum heatsink. Thermograms of aluminum board surface were taken by thermal imaging camera MobIR M4.
{"title":"Study of thermal conductivity of nanoporous anodic alumina layer formed in sulphuric acid using steady-state heat flow technique","authors":"S. Andreev, K. Chernyakova, B. Tzaneva, V. Videkov, I. Vrublevsky","doi":"10.1109/ET.2017.8124331","DOIUrl":"https://doi.org/10.1109/ET.2017.8124331","url":null,"abstract":"The paper presents the results of studies of thermal characteristics of nanoporous anodic alumina layer formed in sulphuric acid. One-sided heating of aluminum boards by heating element from carbon filament was used. The temperature of the back side of the board was kept constant by using an aluminum heatsink. Thermograms of aluminum board surface were taken by thermal imaging camera MobIR M4.","PeriodicalId":127983,"journal":{"name":"2017 XXVI International Scientific Conference Electronics (ET)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125891887","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}
This paper highlights the importance of a BMS when operating with lithium-ion cells, especially within narrow SOA. A classification of BMSs is proposed based on four criteria. Based on the classification guidelines for optimal selection of a BMS for given application are also proposed. Using the guidelines an example BMS is selected and studied experimentally. The studied system operates within the SOA, reveals high accuracy during the balancing process, obtains achieves short response time and it is easy to setup and use. The algorithm applied for experimental validation is presented and discussed.
{"title":"Selection guidelines for BMSs used in ultralight electric vehicles","authors":"R. Stoyanov, V. Valchev, D. Stefanov","doi":"10.1109/ET.2017.8124390","DOIUrl":"https://doi.org/10.1109/ET.2017.8124390","url":null,"abstract":"This paper highlights the importance of a BMS when operating with lithium-ion cells, especially within narrow SOA. A classification of BMSs is proposed based on four criteria. Based on the classification guidelines for optimal selection of a BMS for given application are also proposed. Using the guidelines an example BMS is selected and studied experimentally. The studied system operates within the SOA, reveals high accuracy during the balancing process, obtains achieves short response time and it is easy to setup and use. The algorithm applied for experimental validation is presented and discussed.","PeriodicalId":127983,"journal":{"name":"2017 XXVI International Scientific Conference Electronics (ET)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115077531","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}
A simple and yet extremely effective digital hardware true-random number generator is presented. It is capable of operating as a memoryless source and as both a Markov chain source and a hidden Markov model source, with flexible switching between these modes. The device has a scalable design and demonstrates a remarkable performance.
{"title":"A floating-gate array based discrete true-random stream generator","authors":"J. Genoff","doi":"10.1109/ET.2017.8124344","DOIUrl":"https://doi.org/10.1109/ET.2017.8124344","url":null,"abstract":"A simple and yet extremely effective digital hardware true-random number generator is presented. It is capable of operating as a memoryless source and as both a Markov chain source and a hidden Markov model source, with flexible switching between these modes. The device has a scalable design and demonstrates a remarkable performance.","PeriodicalId":127983,"journal":{"name":"2017 XXVI International Scientific Conference Electronics (ET)","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115244181","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}
A voltage-mode boost converter for automotive (primarily LED headlamp) applications with DSP digital control is presented in this paper. A lean digital control design procedure is proposed. The transfer function of the boost converter's power plant is derived and a three-pole three-zero (3p3z) compensator is designed in MATLAB. The 3p3z-compensator is translated into the z-domain and implemented on a microcontroller with DSP core. A prototype boost converter is designed, built and thoroughly investigated. The performance of the tuned boost controller is evaluated in terms of stability, steady-state precision, transient response and efficiency.
{"title":"Design of a digitally controlled boost converter for automotive headlamp applications","authors":"E. Kovatchev, N. Evstatieva","doi":"10.1109/ET.2017.8124359","DOIUrl":"https://doi.org/10.1109/ET.2017.8124359","url":null,"abstract":"A voltage-mode boost converter for automotive (primarily LED headlamp) applications with DSP digital control is presented in this paper. A lean digital control design procedure is proposed. The transfer function of the boost converter's power plant is derived and a three-pole three-zero (3p3z) compensator is designed in MATLAB. The 3p3z-compensator is translated into the z-domain and implemented on a microcontroller with DSP core. A prototype boost converter is designed, built and thoroughly investigated. The performance of the tuned boost controller is evaluated in terms of stability, steady-state precision, transient response and efficiency.","PeriodicalId":127983,"journal":{"name":"2017 XXVI International Scientific Conference Electronics (ET)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117101239","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}
The main advantages of the resonant converters are the high efficiencies, low losses and minimal stress over the power semiconductors achievable with the soft-switching capabilities. This improvement over the standard half- and full-bridge converters comes with added complexity but nevertheless offers several performance benefits. The aim of this paper is to presents methodic for the design and verification of the series isolated resonant DC-DC converters.
{"title":"Development of series resonant converter models with output transformer","authors":"N. Hinov, T. Hranov","doi":"10.1109/ET.2017.8124348","DOIUrl":"https://doi.org/10.1109/ET.2017.8124348","url":null,"abstract":"The main advantages of the resonant converters are the high efficiencies, low losses and minimal stress over the power semiconductors achievable with the soft-switching capabilities. This improvement over the standard half- and full-bridge converters comes with added complexity but nevertheless offers several performance benefits. The aim of this paper is to presents methodic for the design and verification of the series isolated resonant DC-DC converters.","PeriodicalId":127983,"journal":{"name":"2017 XXVI International Scientific Conference Electronics (ET)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123867854","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}
The aim of the paper is to studying the possibilities of stepped induction thermography for corrosion evaluation. It is proposed non-destructive and contactless corrosion evaluation method. It is presented accuracy decreasing factors and used solutions in proposed method. Test specimens made from different magnesium alloys is prepared. The results are presented in graphical form and discussed.
{"title":"Corrosion evaluation with stepped induction thermography","authors":"A. Stoynova, B. Bonev, P. Avramov","doi":"10.1109/ET.2017.8124391","DOIUrl":"https://doi.org/10.1109/ET.2017.8124391","url":null,"abstract":"The aim of the paper is to studying the possibilities of stepped induction thermography for corrosion evaluation. It is proposed non-destructive and contactless corrosion evaluation method. It is presented accuracy decreasing factors and used solutions in proposed method. Test specimens made from different magnesium alloys is prepared. The results are presented in graphical form and discussed.","PeriodicalId":127983,"journal":{"name":"2017 XXVI International Scientific Conference Electronics (ET)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121700460","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}
T. Djamiykov, K. Asparuhova, Iliya Mitev, T. N. Lazarov
The paper presents a technical solution for one-dimensional (east-west) solar panels managing as two photovoltaic cells are used for the sensor. The photovoltaic cells are placed at an angle of 45 ° to each other on the surface of the panel. If the difference between the measured radiations by the cells is greater than 5%, the corresponding relay is activated and the panel rotates. The proposed solution is simple, its parameters can be easily changed and can be implemented with the Arduino microcontroller. It provides a rapid reaction to increase the effectiveness of the solar panels under fast changing environmental conditions. The implementation and experimental results are also presented.
{"title":"Sun tracker with sensor — photovoltaic cell","authors":"T. Djamiykov, K. Asparuhova, Iliya Mitev, T. N. Lazarov","doi":"10.1109/ET.2017.8124341","DOIUrl":"https://doi.org/10.1109/ET.2017.8124341","url":null,"abstract":"The paper presents a technical solution for one-dimensional (east-west) solar panels managing as two photovoltaic cells are used for the sensor. The photovoltaic cells are placed at an angle of 45 ° to each other on the surface of the panel. If the difference between the measured radiations by the cells is greater than 5%, the corresponding relay is activated and the panel rotates. The proposed solution is simple, its parameters can be easily changed and can be implemented with the Arduino microcontroller. It provides a rapid reaction to increase the effectiveness of the solar panels under fast changing environmental conditions. The implementation and experimental results are also presented.","PeriodicalId":127983,"journal":{"name":"2017 XXVI International Scientific Conference Electronics (ET)","volume":"147 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113985583","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}
This paper, presents a model to predict the energy output from reverse electrowetting energy harvesting system with use of cost-effective materials. Reverse electrowetting on dielectric allows energy to be harvested from spontaneous aperiodic mechanical movements, where conventional energy harvesting approaches are not suitable for due to low energy conversion efficiency and frequency.
{"title":"A model for reverse electrowetting with cost-effective materials","authors":"R. Rusev, G. Angelov, K. Angelov, D. Nikolov","doi":"10.1109/ET.2017.8124371","DOIUrl":"https://doi.org/10.1109/ET.2017.8124371","url":null,"abstract":"This paper, presents a model to predict the energy output from reverse electrowetting energy harvesting system with use of cost-effective materials. Reverse electrowetting on dielectric allows energy to be harvested from spontaneous aperiodic mechanical movements, where conventional energy harvesting approaches are not suitable for due to low energy conversion efficiency and frequency.","PeriodicalId":127983,"journal":{"name":"2017 XXVI International Scientific Conference Electronics (ET)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115834180","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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