Pub Date : 2016-06-01DOI: 10.1109/ISFEE.2016.7803210
J. J. Mesas, L. Monjo, L. Sainz, J. Pedra
Voltage source converter (VSC) DC systems are a new and emerging technology. They offer advantages over AC systems but also pose concerns, such as transient fault currents. VSCs are not protected against very fast-transient overcurrent caused by DC cable faults. In order to design protection systems for prompt interruption and isolation of these faults, DC system behavior under fault conditions must be studied. This paper investigates two-level VSC DC system response to DC cable faults and provides analytical expressions for characterizing DC fault overcurrent and voltages and identifying main DC fault characteristics (i.e., type, distance and resistance). This study is a useful tool for further DC system protection design.
{"title":"Cable fault characterization in VSC DC systems","authors":"J. J. Mesas, L. Monjo, L. Sainz, J. Pedra","doi":"10.1109/ISFEE.2016.7803210","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803210","url":null,"abstract":"Voltage source converter (VSC) DC systems are a new and emerging technology. They offer advantages over AC systems but also pose concerns, such as transient fault currents. VSCs are not protected against very fast-transient overcurrent caused by DC cable faults. In order to design protection systems for prompt interruption and isolation of these faults, DC system behavior under fault conditions must be studied. This paper investigates two-level VSC DC system response to DC cable faults and provides analytical expressions for characterizing DC fault overcurrent and voltages and identifying main DC fault characteristics (i.e., type, distance and resistance). This study is a useful tool for further DC system protection design.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"66 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":"129551223","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.2016.7803241
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.2016.7803224
N. Tahir, G. Brooker
The paper presents a waveguide-to-probe transition for testing millimeter wave band planar harmonic tag antennas. It discusses in detail the design and the tuning approach for developing the waveguide transition. The transition limits the radiation leakage and is easy to fabricate. However, it is narrow band and could not be used for testing multiple antennas simultaneously. The working of the transition is validated by measuring the return losses of 77 GHz planar harmonic antenna which are in good agreement with the simulated results.
{"title":"Millimeter wave band waveguide-to-probe transition for planar harmonic tag antennas","authors":"N. Tahir, G. Brooker","doi":"10.1109/ISFEE.2016.7803224","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803224","url":null,"abstract":"The paper presents a waveguide-to-probe transition for testing millimeter wave band planar harmonic tag antennas. It discusses in detail the design and the tuning approach for developing the waveguide transition. The transition limits the radiation leakage and is easy to fabricate. However, it is narrow band and could not be used for testing multiple antennas simultaneously. The working of the transition is validated by measuring the return losses of 77 GHz planar harmonic antenna which are in good agreement with the simulated results.","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":"130889652","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.2016.7803192
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.2016.7803176
L'Hocine Mouas, H. Mohellebi, S. H. Ould Ouali
This work concerns the modeling by finite element method of magnetostatic's phenomena occurring in ferromagnetic material and governed by the 2D non-linear equation. It deals with magnetic interaction between the magnetic field produced by an independent source field (land) and ferromagnetic material representing the hull of a ship. The latter is represented by the magnetic curve B(H) deduced from the Rayleigh hysteresis model. The magnetic hysteresis was successfully integrated into the finite element calculation of the field produced by the ferromagnetic shell through the Rayleigh model. A distribution of the magnetic field at any point of the domain resolution is thus obtained and in particular at the vicinities of the ferromagnetic shell. The results of simulation obtained for various orientations of magnetic magnetization were compared, a good agreement was found with the literature.
{"title":"Modeling of nonlinear electromagnetic phenomena of ship's magnetism","authors":"L'Hocine Mouas, H. Mohellebi, S. H. Ould Ouali","doi":"10.1109/ISFEE.2016.7803176","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803176","url":null,"abstract":"This work concerns the modeling by finite element method of magnetostatic's phenomena occurring in ferromagnetic material and governed by the 2D non-linear equation. It deals with magnetic interaction between the magnetic field produced by an independent source field (land) and ferromagnetic material representing the hull of a ship. The latter is represented by the magnetic curve B(H) deduced from the Rayleigh hysteresis model. The magnetic hysteresis was successfully integrated into the finite element calculation of the field produced by the ferromagnetic shell through the Rayleigh model. A distribution of the magnetic field at any point of the domain resolution is thus obtained and in particular at the vicinities of the ferromagnetic shell. The results of simulation obtained for various orientations of magnetic magnetization were compared, a good agreement was found with the literature.","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":"130752222","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.2016.7803230
M. Taciuc
This paper presents an electronic system for testing photovoltaic (PV) modules by tracing their I-V and P-V characteristics in real meteorological test conditions. It consists of an electronic fast varying load based on power MOSFETs controlled by means of a sweeping gate-source voltage, and an appropriate computer-based instrumentation system for the characterization of the PV panels energy conversion. The developed electronic circuit has the advantages of low cost and simplicity. Experimental results obtained with the designed electronic circuit are presented.
{"title":"An experimental system for measuring the PV panel characteristics curves under real operation conditions","authors":"M. Taciuc","doi":"10.1109/ISFEE.2016.7803230","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803230","url":null,"abstract":"This paper presents an electronic system for testing photovoltaic (PV) modules by tracing their I-V and P-V characteristics in real meteorological test conditions. It consists of an electronic fast varying load based on power MOSFETs controlled by means of a sweeping gate-source voltage, and an appropriate computer-based instrumentation system for the characterization of the PV panels energy conversion. The developed electronic circuit has the advantages of low cost and simplicity. Experimental results obtained with the designed electronic circuit are presented.","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":"130584919","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}
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