Browsing by Author "Bouzida, Ahcene"

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    Calculation of IGBT power losses and junction temperature in inverter drive
    (IEEE, 2016) Bouzida, Ahcene; Abdelli, Radia; Ouadah, M'hamed
    Several techniques for estimating power losses in insulated-gate bipolar transistors (IGBTs), diodes and MOSFETs are known. Most of the approaches in the literature deal with PWM switching technique. In this paper presents a feasible loss model to estimate IGBT losses in a switching operation. The loss model is coupled to RC (Foster) Network using the Thermal Impedance. This paper investigates the power losses in IGBT's and associated Diodes as a function of the circuit and the temperature variation during operation. A full presentation of the electro-thermal model has been developed and simulated
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    Diagnoses and mitigation of the corrosion due to the electromagnetic coupling between the HVPTL and buried pipeline
    (IEEE, 2019) Ouadah, M'hamed; Touhami, Omar; Ibtiouen, Rachid; Bouzida, Ahcene
    The aims of this paper are the diagnosis and the mitigation of the corrosion induced by the HVPTL onto the buried pipelines. To do this, firstly the magnetic field and the induced alternating current density onto the buried pipeline were calculated. Then, the effect of the alternating current densities induced onto the pipeline was characterized by the electrochemical measurements. The obtained results were shown that the induction caused by the high voltage power lines (HVPTL) affects the electrochemical character of the buried pipeline and accelerate their corrosion. However, one technical solution was proposed to mitigate the pipelines from alternating corrosion
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    Dynamic eccentricity fault diagnosis in induction motors using finite element method and experimental tests
    (Inder Science Online, 2017) Bouzida, Ahcene; Abdelli, Radia; Touhami, Omar; Aibeche, Abderrazak
    This paper presents the dynamic eccentricity (DE) in the squirrel cage induction machine obtained by the simulation using finite element method (FEM) and the experimental tests. Motor current signature analysis (MCSA) through the power spectral density (PSD) is used to monitor the low frequency components related to the rotor faults. In order to generalise the study, a comparison was performed between faulty machines and healthy, under different load conditions. The experimental tests show the encountered difficulties in the detection of the dynamic eccentricity under various load conditions because the spectral representation shows the existence of low frequency components for the healthy case, which are superimposed with the indicator components. These low frequency components offer an alternative way to the monitoring of eccentricity air-gap when the load is balanced
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    Dynamic eccentricity fault diagnosis in induction motors using finite element method and experimental tests
    (Inderscience, 2017) Bouzida, Ahcene; Abdelli, Radia; Touhami, Omar; Aibeche, Abderrazak
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    Pipelines corrosion due to the electromagnetic pollution caused by the high voltage power lines
    (2016) Ouadah, M'hamed; Touhami, Omar; Ibtiouen, R.; Bouzida, Ahcene; Bouyegh, Saida; Allou, Djilali; Haddad, Ahmed
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    A randomized carrier-based discontinuous pulse width modulation strategy for neutral point clamped three-level inverter
    (Publishing House of the Romanian Academy, 2024) Boudouda, Aimad; Aibeche, Abderrezak; Bouzida, Ahcene; Boudjerda, Nasserdine
    This article introduces a novel approach called randomized carrier-based discontinuous pulse width modulation (RCDPWM) to address the challenge of mitigating both low-order and high-order harmonics concentrated at the switching frequency and its integer multiples in the output voltage and current of a three-level inverter. The proposed strategy reduces switching losses and a wide dispersion of voltage and current harmonics with significantly smaller amplitudes by integrating features from discontinuous and randomized PWM methods. This characteristic proves beneficial for enhancing efficiency and electromagnetic compatibility. The RCDPWM strategy involves three schemes: two simple schemes (one random parameter), randomized pulse position modulation (RPP-DPWM) and randomized carrier frequency modulation (RCF-DPWM), and a dual scheme combining the two previous ones (RPPRCF-DPWM). Power spectral density (PSD) is used to assess the effectiveness of the proposed strategy in quantitatively analyzing the harmonic dispersion degree. The results demonstrate that the proposed RCDPWM strategy significantly expands harmonic clusters around the switching frequency, reducing its intensity. The spectrum analysis revealed that the RPPRCF-DPWM scheme is the most effective in spreading the output voltage and current spectrum compared to simple schemes (RPP-DPWM and RCF-DPWM).
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    Spectral analysis of switch voltage for dual randomized PWM DC-DC converters operating in DCM
    (Taylor and Francis, 2021) Boudouda, Aimad; Bouzida, Ahcene; Nafa, Fares
    This paper addresses the spectral characteristics of a dual randomised pulse width modulation scheme (RCFM-RPPM) for reducing conducted EMI in the basic DC-DC converters (buck, boost, and buck-boost) operating in discontinuous conduction mode (DCM). It combines two simple schemes, random carrier frequency modulation (RCFM), and a random pulse position (RPPM). First, the modulating principle of the dual randomised PWM is presented. Then, a mathematical model of power spectral density (PSD) that characterises the switch voltage of the three basic DC-DC converters is derived. The mathematical model is validated by simulation of a buck converter operating in DCM. Analytical and simulation results show the effectiveness of PSD spreading of the dual randomised scheme compare to the simple randomised schemes. Moreover, the PSD analysis is confirmed by FFT (Fast Fourier Transform) analysis of the switch voltage. Finally, the effect of randomness levels on the PSD spreading is studied
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    Stability improvement of power system with connected wind turbine
    (Aimad Boudouda, 2020) Bouzida, Ahcene; Abdelli, Radia; Aibeche, Abderrazak; Boudouda, Aimad Boudouda
    The penetration of doubly fed induction generator (DFIG) into the power grid has become an important concern for power system engineers today. Voltage stability is an important factor to maintain the wind farm in service during some abnormal operating conditions. This paper deals with the integration of synchronous static compensator (STATCOM) to overcome the voltage stability issue for the power systems with connected wind turbine. A dynamic model for the DFIG has been presented and the integration of a STATCOM to maintain stable voltage has been studied during a low voltage conditions. The developed system is simulated and the results demonstrate that the good control of STATCOM enhances voltage regulation as well as transient stability of the DFIG during three phase faults. Many verifications based on time-domain simulations have been presented in order to show the STATCOM capability in improving transient stability of the power system
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    Stability improvement of power system with connected wind turbine using three-levels STATCOM
    (Inder Science Publicher, 2018) Bouzida, Ahcene; Abdelli, Radia; Aineche, Abderrazak; Boudouda, Aimad
    The penetration of Doubly Fed Induction Generator (DFIG) into the power grid has become an important concern for power system engineers today. Voltage stability is an important factor to maintain the wind farm in service during some abnormal operating conditions. This paper deals with the integration of Synchronous Static Compensator STATCOM to overcome the voltage stability issue for the power systems with connected wind turbine. A dynamic model for the DFIG has been presented and the integration of a STATCOM to maintain stable voltage has been studied during a low voltage conditions. The developed system is simulated and the results demonstrate that the good control of STATCOM enhances voltage regulation as well as transient stability of the DFIG during three phase faults. Many verifications based on timedomain simulations have been presented in order to show the STATCOM capability in improving transient stability of the power system
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    Static eccentricity fault modeling in permanent-magnet synchronous motors
    (IEEE, 2016) Abdelli, Radia; Bouzida, Ahcene; Touhami, Omar; Ouadah, M'hamed
    In this paper, a model based on the finite element analysis has been developed for healthy and eccentric PMSM. The proposed model is analyzed by time stepping Finite element method. The electromagnetic field distribution, air-gap magnetic flux density and the leakage inductances under healthy and eccentric rotor have been calculated. Meanwhile, the MCSA of the healthy and faulty PMSM is inspected under various static eccentricity levels