Pub Date : 2014-11-01DOI: 10.1109/CISTEM.2014.7076979
S. Tahi, R. Ibtiouen
The most important parameters of a synchronous reluctance machine (SynRM) from a design optimization and control point of view are both the ratio and the difference between the inductances in the d and q axes, since they define the machine's characteristic such as torque and power factor. The direct-axis and quadrature-axis inductances of SynRM are usually considered as constant. In fact, both the d-axis and q-axis inductances vary with load conditions because of magnetic circuit saturation. In this paper a SynRM with salient-pole rotor is studied. Using finite element analysis, a procedure based on the energy perturbation method, is developed to calculate the self and cross-coupling inductances. The effect of saturation and cross saturation on the inductances behavior and on the produced torque is discussed.
{"title":"Finite element calculation of the dq-axes inductances and torque of synchronous reluctance motor","authors":"S. Tahi, R. Ibtiouen","doi":"10.1109/CISTEM.2014.7076979","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7076979","url":null,"abstract":"The most important parameters of a synchronous reluctance machine (SynRM) from a design optimization and control point of view are both the ratio and the difference between the inductances in the d and q axes, since they define the machine's characteristic such as torque and power factor. The direct-axis and quadrature-axis inductances of SynRM are usually considered as constant. In fact, both the d-axis and q-axis inductances vary with load conditions because of magnetic circuit saturation. In this paper a SynRM with salient-pole rotor is studied. Using finite element analysis, a procedure based on the energy perturbation method, is developed to calculate the self and cross-coupling inductances. The effect of saturation and cross saturation on the inductances behavior and on the produced torque is discussed.","PeriodicalId":115632,"journal":{"name":"2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115898537","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 : 2014-11-01DOI: 10.1109/CISTEM.2014.7076961
A. Khadhraoui, K. Jelassi, J. Trigeassou
In this work, a new estimation approach is proposed to improve the global convergence Output-Error (OE) identification method. The main disadvantage of the OE identification techniques is that they may converge to a secondary optimum. A good initialization converges to the global optimum. In this paper, Least squares (LS) method is selected as initialization step to OE algorithms. It's extended to fractional system to identify unknown parameters and orders. However, the LS method may be too biased and may not lead to a good initialization. We present a new approach based on Instrumental variable (IV) to obtain a good initialization for OE methods. The results are encouraging and they have shown that the LS and IV method based on repeated fractional integration has to lead to a better initialization than arbitrary initialization. We investigate our identification theory with a Monte Carlo simulation that indicates the efficiency of the methods.
{"title":"Least squares and Instrumental Variable techniques for global identification of Fractional Differential Equation","authors":"A. Khadhraoui, K. Jelassi, J. Trigeassou","doi":"10.1109/CISTEM.2014.7076961","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7076961","url":null,"abstract":"In this work, a new estimation approach is proposed to improve the global convergence Output-Error (OE) identification method. The main disadvantage of the OE identification techniques is that they may converge to a secondary optimum. A good initialization converges to the global optimum. In this paper, Least squares (LS) method is selected as initialization step to OE algorithms. It's extended to fractional system to identify unknown parameters and orders. However, the LS method may be too biased and may not lead to a good initialization. We present a new approach based on Instrumental variable (IV) to obtain a good initialization for OE methods. The results are encouraging and they have shown that the LS and IV method based on repeated fractional integration has to lead to a better initialization than arbitrary initialization. We investigate our identification theory with a Monte Carlo simulation that indicates the efficiency of the methods.","PeriodicalId":115632,"journal":{"name":"2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114212674","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 : 2014-11-01DOI: 10.1109/CISTEM.2014.7076927
A. Ammouri, H. Belloumi, T. Ben Salah, F. Kourda
Planar transformers are a novel type of devices used in integrated power systems. Having many advantages compared to classic wire wound technology; it's used to minimize size and weight and to increase their ability to withstand mechanical vibrations. For efficiency point of view, literature demonstrated that the power losses at high frequency of a given planar transformer are significant. However, a tradeoff between the power losses and the frequency of the transformer leads to various levels of optimization. So far, literature has not studied this issue. In our point of view, such a trade-off can be studied by an electromagnetic analysis. A Finite Element Method (FEM) is, however, used to give the planar transformer field and current density distributions windings and the simulations results are obtained. During verification process, simulation results are quite compared with those of Dowell method.
{"title":"High-frequency investigation of planar transformers","authors":"A. Ammouri, H. Belloumi, T. Ben Salah, F. Kourda","doi":"10.1109/CISTEM.2014.7076927","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7076927","url":null,"abstract":"Planar transformers are a novel type of devices used in integrated power systems. Having many advantages compared to classic wire wound technology; it's used to minimize size and weight and to increase their ability to withstand mechanical vibrations. For efficiency point of view, literature demonstrated that the power losses at high frequency of a given planar transformer are significant. However, a tradeoff between the power losses and the frequency of the transformer leads to various levels of optimization. So far, literature has not studied this issue. In our point of view, such a trade-off can be studied by an electromagnetic analysis. A Finite Element Method (FEM) is, however, used to give the planar transformer field and current density distributions windings and the simulations results are obtained. During verification process, simulation results are quite compared with those of Dowell method.","PeriodicalId":115632,"journal":{"name":"2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125586727","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 : 2014-11-01DOI: 10.1109/CISTEM.2014.7076956
J. Sakly, A. Ben Abdelghani-Bennani, I. Slama-Belkhodja, H. Sammoud, M. Orabi
The elimination of the transformer of the connection of a PV installation doesn't only reduce the cost, size and weight, but also improves the efficiency of PV system installation. However, removal of the transformer causes the loss of electrical isolation between the PV generator and the grid. In this paper, a transformer less single-phase single stage grid connected PV system is proposed. A control algorithm for both the maximum extraction of the power and control of current injected into the grid is described. Also, a detailed comparative study of four converters topologies is elaborated showing the interest of the NPC structures against the problem caused by the common mode currents especially in the absence of transformers.
{"title":"Comparative study of topologies of single phase static converters for grid connected PV systems","authors":"J. Sakly, A. Ben Abdelghani-Bennani, I. Slama-Belkhodja, H. Sammoud, M. Orabi","doi":"10.1109/CISTEM.2014.7076956","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7076956","url":null,"abstract":"The elimination of the transformer of the connection of a PV installation doesn't only reduce the cost, size and weight, but also improves the efficiency of PV system installation. However, removal of the transformer causes the loss of electrical isolation between the PV generator and the grid. In this paper, a transformer less single-phase single stage grid connected PV system is proposed. A control algorithm for both the maximum extraction of the power and control of current injected into the grid is described. Also, a detailed comparative study of four converters topologies is elaborated showing the interest of the NPC structures against the problem caused by the common mode currents especially in the absence of transformers.","PeriodicalId":115632,"journal":{"name":"2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122028711","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 : 2014-11-01DOI: 10.1109/CISTEM.2014.7077075
Z. Salah, M. Lakhoua, A. Sellami
This communication presents the interest of the use of the methods for the operating safety studies and the analysis of control-command systems. Therefore, we present the various concepts of operating safety of industrial installations. Our contribution is to locate the main methods used in the operating safety studies over the methods used for the analysis and design of control-command systems for searching for a hybridization of these methods. In fact, we investigate firstly the SADT, FMDS and Safe-SADT methods and on the other hand both Extented SADT and SA/RT methods.
{"title":"On the operating safety and the Analysis of control-command systems","authors":"Z. Salah, M. Lakhoua, A. Sellami","doi":"10.1109/CISTEM.2014.7077075","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7077075","url":null,"abstract":"This communication presents the interest of the use of the methods for the operating safety studies and the analysis of control-command systems. Therefore, we present the various concepts of operating safety of industrial installations. Our contribution is to locate the main methods used in the operating safety studies over the methods used for the analysis and design of control-command systems for searching for a hybridization of these methods. In fact, we investigate firstly the SADT, FMDS and Safe-SADT methods and on the other hand both Extented SADT and SA/RT methods.","PeriodicalId":115632,"journal":{"name":"2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127825461","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 : 2014-11-01DOI: 10.1109/CISTEM.2014.7076931
A. Nasri, H. Zairi, A. Gharsallah
The present paper highlights a compact and low cost bandpass substrate integrated waveguide (SIW) filter with two cavities. The (SIW) filter has well-known advantages of low insertion loss and high selectivity. It provides a significant solution to the integration of planar and nonplanar circuits. As the simulated results show, the stopband rejection of filter is more than 30dB while the insertion loss is less than -0.8dB at the bandpass, thus due to the effects of the high Q resonators.
{"title":"A compact bandpass substrate integrated waveguide filter","authors":"A. Nasri, H. Zairi, A. Gharsallah","doi":"10.1109/CISTEM.2014.7076931","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7076931","url":null,"abstract":"The present paper highlights a compact and low cost bandpass substrate integrated waveguide (SIW) filter with two cavities. The (SIW) filter has well-known advantages of low insertion loss and high selectivity. It provides a significant solution to the integration of planar and nonplanar circuits. As the simulated results show, the stopband rejection of filter is more than 30dB while the insertion loss is less than -0.8dB at the bandpass, thus due to the effects of the high Q resonators.","PeriodicalId":115632,"journal":{"name":"2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127484024","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 : 2014-11-01DOI: 10.1109/CISTEM.2014.7076940
A. Abdi, Y. Ouazir
In this work, we propose two approaches based on the theory of transmission lines to model the direct impact of lightning wave on a guard cable. The first consist to solving the propagation voltage equation in 2D by FDTD (Finite Difference Time Domain). We show the theoretical developments leading to the propagation equation in scalar potential, its finite difference discretization and the resulting linear algebraic equations. The second approach is based on solving the system of equations in time of transmission lines FDTD. The distributions of the potential and current are obtained.
{"title":"Analysis of lightning surges by FDTD in high voltage networks","authors":"A. Abdi, Y. Ouazir","doi":"10.1109/CISTEM.2014.7076940","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7076940","url":null,"abstract":"In this work, we propose two approaches based on the theory of transmission lines to model the direct impact of lightning wave on a guard cable. The first consist to solving the propagation voltage equation in 2D by FDTD (Finite Difference Time Domain). We show the theoretical developments leading to the propagation equation in scalar potential, its finite difference discretization and the resulting linear algebraic equations. The second approach is based on solving the system of equations in time of transmission lines FDTD. The distributions of the potential and current are obtained.","PeriodicalId":115632,"journal":{"name":"2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126377545","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 : 2014-11-01DOI: 10.1109/CISTEM.2014.7077011
M. Amah-Tchiou, J. Lecointe, A. Lacaze, L. Solcan
This paper investigates a back to back test simulation of an interior permanent magnet (IPM) synchronous machine with fractional slot concentrated windings (FSCW). The studied machine is designed to equip a floating vertical axis wind turbine. The principal characteristics and the structure of the machine are presented, as well as the back to back test principle. The parking brake mode is investigated to determine at which aerodynamic torque the system converters have to be started. The designed system and the simulations results, obtained with the Matlab-Simulink platform are described. Simulation results obtained with the proposed control are compared to those obtained with the equivalent single-phase diagram.
{"title":"Back to back tests simulations of an interior permanent magnet machine","authors":"M. Amah-Tchiou, J. Lecointe, A. Lacaze, L. Solcan","doi":"10.1109/CISTEM.2014.7077011","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7077011","url":null,"abstract":"This paper investigates a back to back test simulation of an interior permanent magnet (IPM) synchronous machine with fractional slot concentrated windings (FSCW). The studied machine is designed to equip a floating vertical axis wind turbine. The principal characteristics and the structure of the machine are presented, as well as the back to back test principle. The parking brake mode is investigated to determine at which aerodynamic torque the system converters have to be started. The designed system and the simulations results, obtained with the Matlab-Simulink platform are described. Simulation results obtained with the proposed control are compared to those obtained with the equivalent single-phase diagram.","PeriodicalId":115632,"journal":{"name":"2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM)","volume":"412 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131685684","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 : 2014-11-01DOI: 10.1109/CISTEM.2014.7077016
B. Alik, Y. Kemari, N. Bendekkiche, M. Teguar, A. Mekhaldi
This paper presents an optimum grounding grid design for the substation of Ain El-Melh (situated in M'Sila city, Algeria) using particle swarm particle technique. The aim is to minimize the cost of the considered grounding system in accordance with the security restrictions required by the ANSI/IEEE Std. 80-2000, taking into account as constraints the limitations of touch and step voltages as well as the grounding resistance. A new mathematical model has been proposed for the cost function. This later includes number of conductors, conductor dimension, grid depth, number of rods, length of rods, total area of excavation and revetment. The results so obtained were confronted to those found using the calculation code CYMGrd. A good concordance has been obtained.
{"title":"Optimization of grounding system of 60/30 kV substation of Ain El-Melh using particle swarm","authors":"B. Alik, Y. Kemari, N. Bendekkiche, M. Teguar, A. Mekhaldi","doi":"10.1109/CISTEM.2014.7077016","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7077016","url":null,"abstract":"This paper presents an optimum grounding grid design for the substation of Ain El-Melh (situated in M'Sila city, Algeria) using particle swarm particle technique. The aim is to minimize the cost of the considered grounding system in accordance with the security restrictions required by the ANSI/IEEE Std. 80-2000, taking into account as constraints the limitations of touch and step voltages as well as the grounding resistance. A new mathematical model has been proposed for the cost function. This later includes number of conductors, conductor dimension, grid depth, number of rods, length of rods, total area of excavation and revetment. The results so obtained were confronted to those found using the calculation code CYMGrd. A good concordance has been obtained.","PeriodicalId":115632,"journal":{"name":"2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125778614","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 : 2014-11-01DOI: 10.1109/CISTEM.2014.7076752
Makrem Ben Jdira, Imen Jemaa, K. Ouni
Automatic speaker recognition is to identify an individual from the audio recording of his voice. Several techniques exist in the current state of the art of the discipline. We designed a new technique comparable to those existing using the frequency of vibration of the vocal cords called the fundamental frequency. It is highly dependent on physiological characteristics of the individual. It is remarkably different from one person to another. We studied the existing techniques for estimating pitch and we chose the YAAPT technique (Yet Another Algorithm for Pitch Detection). Then we calculated the probability distribution of occurrence of each value of F0 in the speech signal to each speaker, and we modeled it by a Gaussian mixture (GMM). By testing our technique in text-independent mode and comparing it with other existing techniques in the literature, we noticed its performance.
自动说话人识别是通过录音来识别一个人的声音。在该学科目前的艺术状态中存在着几种技术。我们设计了一种新技术，与现有的技术相媲美，使用声带振动的频率，称为基频。它高度依赖于个体的生理特征。这因人而异。我们研究了现有的估计音高的技术，我们选择了YAAPT技术(Yet Another Algorithm for pitch Detection)。然后计算每个说话人的语音信号中每个F0值出现的概率分布，并通过高斯混合(GMM)对其建模。通过在文本无关模式下测试我们的技术，并将其与文献中其他现有技术进行比较，我们注意到它的性能。
{"title":"Speaker recognition system based on pitch estimation","authors":"Makrem Ben Jdira, Imen Jemaa, K. Ouni","doi":"10.1109/CISTEM.2014.7076752","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7076752","url":null,"abstract":"Automatic speaker recognition is to identify an individual from the audio recording of his voice. Several techniques exist in the current state of the art of the discipline. We designed a new technique comparable to those existing using the frequency of vibration of the vocal cords called the fundamental frequency. It is highly dependent on physiological characteristics of the individual. It is remarkably different from one person to another. We studied the existing techniques for estimating pitch and we chose the YAAPT technique (Yet Another Algorithm for Pitch Detection). Then we calculated the probability distribution of occurrence of each value of F0 in the speech signal to each speaker, and we modeled it by a Gaussian mixture (GMM). By testing our technique in text-independent mode and comparing it with other existing techniques in the literature, we noticed its performance.","PeriodicalId":115632,"journal":{"name":"2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM)","volume":"29 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125787305","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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