Pub Date : 2014-11-01DOI: 10.1109/CISTEM.2014.7076947
Ines Aloui, Soufiane Gasmi
This paper develops parameter estimates for the Pareto intensity of the second kind using type I censored samples without and with replacement. The maximum likelihood estimates for its unknown parameters and their approximate asymptotic variance-covariance matrix are derived. We also present approximate confidence intervals. Numerical simulation results are presented and used to assess the performance of the proposed estimation method. Finally an application on a real data set shows the efficiency of our model.
{"title":"Parameters estimation based on type I censored samples using a Pareto intensity of the second kind","authors":"Ines Aloui, Soufiane Gasmi","doi":"10.1109/CISTEM.2014.7076947","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7076947","url":null,"abstract":"This paper develops parameter estimates for the Pareto intensity of the second kind using type I censored samples without and with replacement. The maximum likelihood estimates for its unknown parameters and their approximate asymptotic variance-covariance matrix are derived. We also present approximate confidence intervals. Numerical simulation results are presented and used to assess the performance of the proposed estimation method. Finally an application on a real data set shows the efficiency of our model.","PeriodicalId":115632,"journal":{"name":"2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM)","volume":"4 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":"124484029","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.2014.7077046
M. Ouassaid, Kamal Elyaaloui, M. Cherkaoui
This paper addresses the problem of control of wind power generator in variable speed. Sliding mode control strategy presents attractive features such as robustness to parametric uncertainties of the different components of the system. In this way, sliding-mode control laws are proposed for the purpose of generating the maximum power, regulating the DC link voltage and providing unity power factor. The Lyapunov method is employed to guarantee the reaching and sustaining of sliding mode and stability of the control system. Evaluation of the consistency and performance of the proposed sliding mode control approach has been established on a 3MW three-blade wind turbine. Simulation results show that the proposed control strategy is effective in terms of MPPT control strategy and reactive power regulation to guarantee unity power factor.
{"title":"Nonlinear control for a grid-connected Wind turbine with Induction Generator","authors":"M. Ouassaid, Kamal Elyaaloui, M. Cherkaoui","doi":"10.1109/CISTEM.2014.7077046","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7077046","url":null,"abstract":"This paper addresses the problem of control of wind power generator in variable speed. Sliding mode control strategy presents attractive features such as robustness to parametric uncertainties of the different components of the system. In this way, sliding-mode control laws are proposed for the purpose of generating the maximum power, regulating the DC link voltage and providing unity power factor. The Lyapunov method is employed to guarantee the reaching and sustaining of sliding mode and stability of the control system. Evaluation of the consistency and performance of the proposed sliding mode control approach has been established on a 3MW three-blade wind turbine. Simulation results show that the proposed control strategy is effective in terms of MPPT control strategy and reactive power regulation to guarantee unity power factor.","PeriodicalId":115632,"journal":{"name":"2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM)","volume":"48 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":"124548556","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.2014.7077056
S. Meddouri, K. Idjdarene, Adel Aberbour
This paper presents the voltage build up process and terminal voltage control of an isolated wind turbine powered induction generator driven by a variable speed wind turbine using fuzzy logic control (FLC) associated with rotor field oriented vector control. Here three-phase induction generator is excited using a PWM inverter/rectifier connected to a single capacitor on the DC side. Wind powered isolated induction generators have an input, wind, which is not controllable. Unlike a grid connected induction generator, in an isolated induction generator there should be a control system that keeps the DC bus voltage at a constant value when the speed of the rotor is varied. FLC allows a more intuitive approach to design which is due to being based on qualitative relations used in everyday language, and also have certain advantages over other conventional controllers such as the classical PI controller, it have the capability of handling uncertain and noisy signals and do not require the knowledge of a detailed mathematical model of the system. The simulation of the system was done with Matlab/Simulink. During voltage build up the variation of magnetizing inductance is taken into consideration.
{"title":"Fuzzy vector control of isolated induction generator taking the saturation effect into account","authors":"S. Meddouri, K. Idjdarene, Adel Aberbour","doi":"10.1109/CISTEM.2014.7077056","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7077056","url":null,"abstract":"This paper presents the voltage build up process and terminal voltage control of an isolated wind turbine powered induction generator driven by a variable speed wind turbine using fuzzy logic control (FLC) associated with rotor field oriented vector control. Here three-phase induction generator is excited using a PWM inverter/rectifier connected to a single capacitor on the DC side. Wind powered isolated induction generators have an input, wind, which is not controllable. Unlike a grid connected induction generator, in an isolated induction generator there should be a control system that keeps the DC bus voltage at a constant value when the speed of the rotor is varied. FLC allows a more intuitive approach to design which is due to being based on qualitative relations used in everyday language, and also have certain advantages over other conventional controllers such as the classical PI controller, it have the capability of handling uncertain and noisy signals and do not require the knowledge of a detailed mathematical model of the system. The simulation of the system was done with Matlab/Simulink. During voltage build up the variation of magnetizing inductance is taken into consideration.","PeriodicalId":115632,"journal":{"name":"2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM)","volume":"25 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":"122717211","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.2014.7076936
L. Saidi, Jaouher Ben Ali, F. Fnaiech
The paper aims to clarify the use of the bi-spectrum to detect non-linearity in time series. Further we show how patterns in the bi-spectrum are useful for identifying the frequency (or bi-frequency) components involved in the nonlinear interaction. The bi-spectrum, a third-order spectrum, has properties that lend themselves to the measurement of nonlinearities in systems. The properties of interest are insensitivity to Gaussian noise and ability to detect quadratic phase coupling. This paper considers the properties of a bi-spectrum estimate when applied to a system with quadratic nonlinearity excited by the superposition of harmonics in the presence of additive Gaussian noise. This is compared, using signal-to-noise ratios, to the power spectrum. Numerical examples were included to verify the results. The study aims to expand the domain of induction machines faults diagnosis. Therefore, to verify the theoretical development, an experimental test bed has been used in a steady-state condition.
{"title":"Bi-spectrum analysis of coupled harmonics and its application to rotor faults diagnosis","authors":"L. Saidi, Jaouher Ben Ali, F. Fnaiech","doi":"10.1109/CISTEM.2014.7076936","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7076936","url":null,"abstract":"The paper aims to clarify the use of the bi-spectrum to detect non-linearity in time series. Further we show how patterns in the bi-spectrum are useful for identifying the frequency (or bi-frequency) components involved in the nonlinear interaction. The bi-spectrum, a third-order spectrum, has properties that lend themselves to the measurement of nonlinearities in systems. The properties of interest are insensitivity to Gaussian noise and ability to detect quadratic phase coupling. This paper considers the properties of a bi-spectrum estimate when applied to a system with quadratic nonlinearity excited by the superposition of harmonics in the presence of additive Gaussian noise. This is compared, using signal-to-noise ratios, to the power spectrum. Numerical examples were included to verify the results. The study aims to expand the domain of induction machines faults diagnosis. Therefore, to verify the theoretical development, an experimental test bed has been used in a steady-state condition.","PeriodicalId":115632,"journal":{"name":"2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM)","volume":"104 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":"124239216","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.2014.7076934
Mouna Ben Hamed, L. Sbita, Salah Beni Hamed
In this paper, fault detection and isolation of a DC motor is discussed. Dynamic space parity approach is used to detect faults. Based on structural residual method, the theoretical symptoms matrix is established. The later is compared to an experimental one to isolate the faults. The validity and usefulness of the fault detection and isolation algorithms are thoroughly verified with experiments on 1kw DC motor using a dSpace system with DS1104 controller board based on digital signal processor (DSP) TMS320F240.
{"title":"Direct current motor real time application of sensor and actuator faults detection and isolation based on structural residual space parity approach","authors":"Mouna Ben Hamed, L. Sbita, Salah Beni Hamed","doi":"10.1109/CISTEM.2014.7076934","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7076934","url":null,"abstract":"In this paper, fault detection and isolation of a DC motor is discussed. Dynamic space parity approach is used to detect faults. Based on structural residual method, the theoretical symptoms matrix is established. The later is compared to an experimental one to isolate the faults. The validity and usefulness of the fault detection and isolation algorithms are thoroughly verified with experiments on 1kw DC motor using a dSpace system with DS1104 controller board based on digital signal processor (DSP) TMS320F240.","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":"130828757","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.2014.7076933
Z. Ghemari, A. Lakehal
In this paper, we research the mechanical sensitivity of the vibration sensor; The mechanical sensitivity mathematical model is developed in function of the relative movement modulus in firstly and in function of the measurement error in secondly. The developed model allowed improving the mechanical sensitivity by enhancing the performance of vibration sensor (the best choice of damping rate and the frequency ratio). The right choice of the damping rate and the frequency range allowed keep the mechanical sensitivity constant. This model is validated by computer simulation and experimental tests.
{"title":"Vibration sensor mechanical sensitivity improvement","authors":"Z. Ghemari, A. Lakehal","doi":"10.1109/CISTEM.2014.7076933","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7076933","url":null,"abstract":"In this paper, we research the mechanical sensitivity of the vibration sensor; The mechanical sensitivity mathematical model is developed in function of the relative movement modulus in firstly and in function of the measurement error in secondly. The developed model allowed improving the mechanical sensitivity by enhancing the performance of vibration sensor (the best choice of damping rate and the frequency ratio). The right choice of the damping rate and the frequency range allowed keep the mechanical sensitivity constant. This model is validated by computer simulation and experimental tests.","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":"128477366","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.2014.7076964
Asma Ouardas, S. Elahmar, I. Dayoub
Ultra Wideband (UWB) radios will unavoidably cause severe interference from the existing narrowband systems nearby. Therefore pulses are applied by forming notches at some frequencies as a way to suppress its interference. This paper present and compare two UWB pulses based on Chebyshev function approximation by using the Parks-McClellan (PM) algorithm and Prolate Spherical Wave Functions (PSWF) function by using Eigenvalue Decomposition (EVD) algorithm. The generated UWB pulses not only meet the Federal Communications Commission (FCC), but also mitigate single and multiple narrow-band interference (NBI).
{"title":"A comparative study of two UWB pulse design methods for narrowband interference mitigation","authors":"Asma Ouardas, S. Elahmar, I. Dayoub","doi":"10.1109/CISTEM.2014.7076964","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7076964","url":null,"abstract":"Ultra Wideband (UWB) radios will unavoidably cause severe interference from the existing narrowband systems nearby. Therefore pulses are applied by forming notches at some frequencies as a way to suppress its interference. This paper present and compare two UWB pulses based on Chebyshev function approximation by using the Parks-McClellan (PM) algorithm and Prolate Spherical Wave Functions (PSWF) function by using Eigenvalue Decomposition (EVD) algorithm. The generated UWB pulses not only meet the Federal Communications Commission (FCC), but also mitigate single and multiple narrow-band interference (NBI).","PeriodicalId":115632,"journal":{"name":"2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM)","volume":"53 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":"115902005","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.2014.7076987
Zoubir Nedjem, T. Seghier, A. Hadjadj
The objective of our work is to determine the levels of the risks caused(provoked) by a close electromagnetic field radiated by a high-voltage line on a human body. By using a calculation code based on finite elements, we calculated the induced currents by the electric field and the magnetic field with an industrial frequency (50 Hz) in a human body being in various positions near a high-voltage electric line of configuration tablecloth.
{"title":"Study of the influence of an electromagnetic field close to a high-voltage line on the human being","authors":"Zoubir Nedjem, T. Seghier, A. Hadjadj","doi":"10.1109/CISTEM.2014.7076987","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7076987","url":null,"abstract":"The objective of our work is to determine the levels of the risks caused(provoked) by a close electromagnetic field radiated by a high-voltage line on a human body. By using a calculation code based on finite elements, we calculated the induced currents by the electric field and the magnetic field with an industrial frequency (50 Hz) in a human body being in various positions near a high-voltage electric line of configuration tablecloth.","PeriodicalId":115632,"journal":{"name":"2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM)","volume":"22 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":"121853370","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.2014.7076950
Y. Mecheri, A. Medjdoub, A. Boubakeur, Slimane Boujemaa
This paper analyses characterization results of Dielectric losses factor experiments performed on laboratory-aged and non-aged 18/30 kV XLPE insulated Medium Voltage (MV) cable samples. Dielectric losses factor was used to characterize and assess, according to IEEE and IEC standards, the state of the investigated cables insulation under electrical and thermal accelerated aging. For this purpose, full size of MV 18/30 (36) kV XLPE cable samples were aged under electrical stress at three levels of voltage (18 kV, 36 kV and 54 kV) during 2000 hours. Under thermal aging conditions, continuous and load cycling tests were carried out at four different temperatures ranging from 80°C to 140°C during 2000 hours and 20 thermal cycles of 8 hours current on and 16 hours current off, respectively. Results showing the evolution of the dissipation factor and the dielectric losses power versus electrical stress are presented and discussed.
{"title":"Characterization of laboratory aged MV XLPE cables using dielectric losses factor measurements","authors":"Y. Mecheri, A. Medjdoub, A. Boubakeur, Slimane Boujemaa","doi":"10.1109/CISTEM.2014.7076950","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7076950","url":null,"abstract":"This paper analyses characterization results of Dielectric losses factor experiments performed on laboratory-aged and non-aged 18/30 kV XLPE insulated Medium Voltage (MV) cable samples. Dielectric losses factor was used to characterize and assess, according to IEEE and IEC standards, the state of the investigated cables insulation under electrical and thermal accelerated aging. For this purpose, full size of MV 18/30 (36) kV XLPE cable samples were aged under electrical stress at three levels of voltage (18 kV, 36 kV and 54 kV) during 2000 hours. Under thermal aging conditions, continuous and load cycling tests were carried out at four different temperatures ranging from 80°C to 140°C during 2000 hours and 20 thermal cycles of 8 hours current on and 16 hours current off, respectively. Results showing the evolution of the dissipation factor and the dielectric losses power versus electrical stress are presented and discussed.","PeriodicalId":115632,"journal":{"name":"2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM)","volume":"78 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":"114996058","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.2014.7077052
Ibrahim Ben Abdallah, M. Jraidi, N. Hamrouni, A. Cherif
In the same line of enhancing photovoltaic integrations with a big scale into medium power grid, in this paper we will present an improved design model of a HTA grid connected to a PV field. Our work aims to find a suitable model with good, accurate results of PV system behavior compared to the network-requested quality signal properties. This will be done while maintaining a high power factor in order to maximize the overall performance of the chain system. Power converter/inverter controls taken will enable a proper synchronization, good timing and steady working, connecting to the network.
{"title":"Modeling, Control and Simulation of a grid connected PV system","authors":"Ibrahim Ben Abdallah, M. Jraidi, N. Hamrouni, A. Cherif","doi":"10.1109/CISTEM.2014.7077052","DOIUrl":"https://doi.org/10.1109/CISTEM.2014.7077052","url":null,"abstract":"In the same line of enhancing photovoltaic integrations with a big scale into medium power grid, in this paper we will present an improved design model of a HTA grid connected to a PV field. Our work aims to find a suitable model with good, accurate results of PV system behavior compared to the network-requested quality signal properties. This will be done while maintaining a high power factor in order to maximize the overall performance of the chain system. Power converter/inverter controls taken will enable a proper synchronization, good timing and steady working, connecting to the network.","PeriodicalId":115632,"journal":{"name":"2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM)","volume":"35 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":"127930422","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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