Pub Date : 2016-06-01DOI: 10.1109/ISFEE.2016.7803158
A. Aydoğan, F. Akleman, S. Yildiz
A hollow waveguide is loaded with dielectric slabs to be operated as a band-pass filter in the X-band. Realizing the followed approach practically, the permittivity values of the slabs are chosen. The thickness values of the slabs are optimized to meet the filter requirements. Levenberg-Marquardt optimization algorithm is utilized to solve the given non-linear optimization problem. Drawbacks of the proposed approach are analyzed in terms of optimization parameters and shown with numerical examples.
{"title":"Dielectric loaded waveguide filter design","authors":"A. Aydoğan, F. Akleman, S. Yildiz","doi":"10.1109/ISFEE.2016.7803158","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803158","url":null,"abstract":"A hollow waveguide is loaded with dielectric slabs to be operated as a band-pass filter in the X-band. Realizing the followed approach practically, the permittivity values of the slabs are chosen. The thickness values of the slabs are optimized to meet the filter requirements. Levenberg-Marquardt optimization algorithm is utilized to solve the given non-linear optimization problem. Drawbacks of the proposed approach are analyzed in terms of optimization parameters and shown with numerical examples.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122672462","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 : 2016-06-01DOI: 10.1109/ISFEE.2016.7803173
N. Goga, A. Vasilățeanu, M. N. Mihailescu, Laurentiu Guta, A. Molnar, Iuliana M. Bocicor, Larisa Bolea, Dragoș Stoica
Our paper presents the first phase in developing an indoor localization technique based on WiFi for patient monitoring scenarios in patient empowerment and ambient assisted living settings. We describe an experiment that measures the accuracy for positioning using WiFi signals and the results show that decent accuracy can be obtained using existing equipment and with a minimum setting effort.
{"title":"Evaluating indoor localization using WiFi for patient tracking","authors":"N. Goga, A. Vasilățeanu, M. N. Mihailescu, Laurentiu Guta, A. Molnar, Iuliana M. Bocicor, Larisa Bolea, Dragoș Stoica","doi":"10.1109/ISFEE.2016.7803173","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803173","url":null,"abstract":"Our paper presents the first phase in developing an indoor localization technique based on WiFi for patient monitoring scenarios in patient empowerment and ambient assisted living settings. We describe an experiment that measures the accuracy for positioning using WiFi signals and the results show that decent accuracy can be obtained using existing equipment and with a minimum setting effort.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132182992","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 : 2016-06-01DOI: 10.1109/ISFEE.2016.7803192
L. Teodorescu
In this paper, some supply techniques for the vacuum tube used in the output stage of a power radiofrequency (RF) amplifier are proposed and studied. These techniques may increase the tube life span and they reduce the operating costs with the power RF transmitter. A complete block diagram of the tube power supply unit and an algorithm to control the tube electrodes supply voltages are carried out. The proposed circuit operates the vacuum tube with a decreased filament voltage, withal maintaining the RF output power at the same level as in the normal operation, at the nominal filament voltage. Although the design is intended to be used in Frequency Modulation (FM) RF equipment from particle accelerators, it may be successfully implemented in any power amplifier which uses vacuum tubes.
{"title":"A supply method of increasing the lifetime of the emission tube in the power radiofrequency transmitters","authors":"L. Teodorescu","doi":"10.1109/ISFEE.2016.7803192","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803192","url":null,"abstract":"In this paper, some supply techniques for the vacuum tube used in the output stage of a power radiofrequency (RF) amplifier are proposed and studied. These techniques may increase the tube life span and they reduce the operating costs with the power RF transmitter. A complete block diagram of the tube power supply unit and an algorithm to control the tube electrodes supply voltages are carried out. The proposed circuit operates the vacuum tube with a decreased filament voltage, withal maintaining the RF output power at the same level as in the normal operation, at the nominal filament voltage. Although the design is intended to be used in Frequency Modulation (FM) RF equipment from particle accelerators, it may be successfully implemented in any power amplifier which uses vacuum tubes.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134240621","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 : 2016-06-01DOI: 10.1109/ISFEE.2016.7803198
S. Zengin, M. Boztepe
Solid state transformer topologies (SST) can be used instead of Low Frequency Transformers (LFT) in the near future because of superior advantages such as; reactive power compensation, output voltage regulation, able to connect renewable energy sources to distribution system and smart control etc. In this study, the loss analysis of mixed current modulated (trapezoid and triangular) DCM AC/DC DAB converter for two-stage SST is introduced. In order to prove the analyses a 100 W SST prototype is set up.
{"title":"Loss analysis of trapezoid and triangular current modulated DCM AC/DC DAB converter","authors":"S. Zengin, M. Boztepe","doi":"10.1109/ISFEE.2016.7803198","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803198","url":null,"abstract":"Solid state transformer topologies (SST) can be used instead of Low Frequency Transformers (LFT) in the near future because of superior advantages such as; reactive power compensation, output voltage regulation, able to connect renewable energy sources to distribution system and smart control etc. In this study, the loss analysis of mixed current modulated (trapezoid and triangular) DCM AC/DC DAB converter for two-stage SST is introduced. In order to prove the analyses a 100 W SST prototype is set up.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"603 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131426651","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 : 2016-06-01DOI: 10.1109/ISFEE.2016.7803152
Viorel Miron-Alexe
This article focuses on the performing experimentation of two different types of current sensors that are to be implemented in a logic decisional process for an automated system of a Smart Grid. The purpose of the experiment is to determine which is the fittest and affordable sensor for energy monitoring of a residential power grid based on renewable energy sources. The experimental comparison is between a Hall sensor and a classical split-core, inductive, current transformer.
{"title":"Comparative study regarding measurements of different AC current sensors","authors":"Viorel Miron-Alexe","doi":"10.1109/ISFEE.2016.7803152","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803152","url":null,"abstract":"This article focuses on the performing experimentation of two different types of current sensors that are to be implemented in a logic decisional process for an automated system of a Smart Grid. The purpose of the experiment is to determine which is the fittest and affordable sensor for energy monitoring of a residential power grid based on renewable energy sources. The experimental comparison is between a Hall sensor and a classical split-core, inductive, current transformer.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131790127","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 : 2016-06-01DOI: 10.1109/ISFEE.2016.7803165
S. Kula, S. Cosman
The paper presents the SRM (Switched Reluctance Motor) model, implemented on multifunction reconfigurable I/O (RIO) FPGA module NI 7841R with the use of the graphical programming language LabVIEW. The model was prepared for the real-time HiL (Hardware in the Loop) platform. The model is virtual counterpart of the real SRM motor, which was originally designed to be used in household goods. The SRM model is in the form of magnetostatic characteristics of torque, current, flux, and rotor position. To obtain it the numerical open-software simulations and real measurements, based on voltage versus current tests were used. Instead of the model description the paper presents also routines to create and implement the model on FPGA target.
本文采用图形化编程语言LabVIEW，在NI 7841R多功能可重构I/O (RIO) FPGA模块上实现了开关磁阻电机(SRM)模型。该模型是为实时HiL (Hardware in The Loop)平台准备的。该模型是真实的SRM电机的虚拟对应，最初设计用于家居用品。SRM模型以转矩、电流、磁通和转子位置等静磁特性的形式表示。为了得到它，采用了开放软件的数值模拟和基于电压对电流试验的实际测量。本文不仅给出了模型的描述，还给出了在FPGA目标上创建和实现模型的例程。
{"title":"Switched reluctance motor model implemented on PXI FPGA target","authors":"S. Kula, S. Cosman","doi":"10.1109/ISFEE.2016.7803165","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803165","url":null,"abstract":"The paper presents the SRM (Switched Reluctance Motor) model, implemented on multifunction reconfigurable I/O (RIO) FPGA module NI 7841R with the use of the graphical programming language LabVIEW. The model was prepared for the real-time HiL (Hardware in the Loop) platform. The model is virtual counterpart of the real SRM motor, which was originally designed to be used in household goods. The SRM model is in the form of magnetostatic characteristics of torque, current, flux, and rotor position. To obtain it the numerical open-software simulations and real measurements, based on voltage versus current tests were used. Instead of the model description the paper presents also routines to create and implement the model on FPGA target.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131283317","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 : 2016-06-01DOI: 10.1109/ISFEE.2016.7803241
M. Ardeleanu, D. Stănescu
University dropout phenomenon after the first year of study is an alarming aspect for higher education in Romania. It has been found that due to an inappropriate orientation (choice) of profession, many young people drop higher education after a year or two of study or they eventually consider themselves professionally unfulfilled. Counseling and orientating high school graduates towards higher education and leading them to a professional career adapted to their skills and abilities is a complex work but which, apparently, does not strike the attention and importance deserved. This article presents a new research which was conducted in February 2016, based on a questionnaire, on a representative group of second year students from the Faculty of Electrical Engineering of Craiova (FEE). It was mainly intended to find out the sources of information and influence of high school graduates about the FEE educational offer, their knowledge on the profession of engineer in the electrical field, framed in a sociohuman context regarding information on the high school graduated, place of residence, parents' educational status, etc., and some suggestions on improving counseling in choosing a career in electrical engineering.
{"title":"A new research concerning some influence factors in the orientation of highschool graduates towards higher technical education","authors":"M. Ardeleanu, D. Stănescu","doi":"10.1109/ISFEE.2016.7803241","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803241","url":null,"abstract":"University dropout phenomenon after the first year of study is an alarming aspect for higher education in Romania. It has been found that due to an inappropriate orientation (choice) of profession, many young people drop higher education after a year or two of study or they eventually consider themselves professionally unfulfilled. Counseling and orientating high school graduates towards higher education and leading them to a professional career adapted to their skills and abilities is a complex work but which, apparently, does not strike the attention and importance deserved. This article presents a new research which was conducted in February 2016, based on a questionnaire, on a representative group of second year students from the Faculty of Electrical Engineering of Craiova (FEE). It was mainly intended to find out the sources of information and influence of high school graduates about the FEE educational offer, their knowledge on the profession of engineer in the electrical field, framed in a sociohuman context regarding information on the high school graduated, place of residence, parents' educational status, etc., and some suggestions on improving counseling in choosing a career in electrical engineering.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131545729","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 : 2016-06-01DOI: 10.1109/ISFEE.2016.7803217
S. Miclaus, P. Bechet, J. Karpowicz
There is a gap of knowledge in the description of the dosimetric behavior of human body when exposed in the reactive near field of VHF antennas. By a voluntary experimental campaign we aimed at extracting the significant parameters that influence the limb currents (measured at lower leg). Three frequencies in the (30-110) MHz band and two input powers were fed into a biconical dipole antenna, while two polarizations were provided. A group of 15 persons were exposed one by one at 2m distance to the source, in three different postures. Descriptive statistics was applied to separate the field-, the anthropometric- and the postural-connected dosimetric parameters. A resonant body behavior was outlined and introducing of a “coupling coefficient” between body and field was proposed. Generally, the incident field level is not a proper predictor of the limb currents.
{"title":"Limb currents due to electromagnetic influence in the VHF reactive near field: The role of field polarization, exposed persons posture and anthropometric parameters","authors":"S. Miclaus, P. Bechet, J. Karpowicz","doi":"10.1109/ISFEE.2016.7803217","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803217","url":null,"abstract":"There is a gap of knowledge in the description of the dosimetric behavior of human body when exposed in the reactive near field of VHF antennas. By a voluntary experimental campaign we aimed at extracting the significant parameters that influence the limb currents (measured at lower leg). Three frequencies in the (30-110) MHz band and two input powers were fed into a biconical dipole antenna, while two polarizations were provided. A group of 15 persons were exposed one by one at 2m distance to the source, in three different postures. Descriptive statistics was applied to separate the field-, the anthropometric- and the postural-connected dosimetric parameters. A resonant body behavior was outlined and introducing of a “coupling coefficient” between body and field was proposed. Generally, the incident field level is not a proper predictor of the limb currents.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123598134","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 : 2016-06-01DOI: 10.1109/ISFEE.2016.7803178
Zhen Hu, Xinran Li
The quantization method of coupling degree is proposed and used to identify the critical nodes in the power system. This method combines the change of injection current on the basis of network analysis technique. The degree of coupling between the various parts of the power grid after the disturbance can be analysed by this method which overcomes shortcomings of ignoring the different operation states when the network technology is applied to the power grid. The proposed index can accurately reflect the influence degree and has a very clear physical meaning. The proposed method is more in line with the actual situation of the power system when compared with the existing complex network model by the application of the IEEE standard sample system. The method is also simulated on the actual central province Power Grid in China, and result shows that the concept of coupling degree is easy to calculate and can real-time track status changes.
{"title":"The degree of coupling analysis method based on current injection","authors":"Zhen Hu, Xinran Li","doi":"10.1109/ISFEE.2016.7803178","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803178","url":null,"abstract":"The quantization method of coupling degree is proposed and used to identify the critical nodes in the power system. This method combines the change of injection current on the basis of network analysis technique. The degree of coupling between the various parts of the power grid after the disturbance can be analysed by this method which overcomes shortcomings of ignoring the different operation states when the network technology is applied to the power grid. The proposed index can accurately reflect the influence degree and has a very clear physical meaning. The proposed method is more in line with the actual situation of the power system when compared with the existing complex network model by the application of the IEEE standard sample system. The method is also simulated on the actual central province Power Grid in China, and result shows that the concept of coupling degree is easy to calculate and can real-time track status changes.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127299051","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 : 2016-06-01DOI: 10.1109/ISFEE.2016.7803156
Marouane El Azzaoui, H. Mahmoudi, B. Bossoufi, Madiha El Ghamrasni
This paper deals with the field-oriented control of a doubly fed induction generator with a variable structure control based on the sliding mode control (SMC) and backstepping control (BSC). In this paper a comparative study of the sliding mode and backstepping control is presented in order to control the stator active and reactive powers of the doubly fed induction generator. The simulation results using Matlab/Simulink environment shows the performances of each controller for reference tracking and robustness against machine parameters variations.
{"title":"Comparative study of the sliding mode and backstepping control in power control of a doubly fed induction generator","authors":"Marouane El Azzaoui, H. Mahmoudi, B. Bossoufi, Madiha El Ghamrasni","doi":"10.1109/ISFEE.2016.7803156","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803156","url":null,"abstract":"This paper deals with the field-oriented control of a doubly fed induction generator with a variable structure control based on the sliding mode control (SMC) and backstepping control (BSC). In this paper a comparative study of the sliding mode and backstepping control is presented in order to control the stator active and reactive powers of the doubly fed induction generator. The simulation results using Matlab/Simulink environment shows the performances of each controller for reference tracking and robustness against machine parameters variations.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"242 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125768749","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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