Publications Scientifiques

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Author: search.filters.author.Grouni, S.

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Now showing 1 - 8 of 8
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    Experimental research of diagnostic measurement tests for power transformers
    (2013) Aibeche, Abderrazak; Grouni, S.; Akroum, Hamza; Boualegue, K.
    This paper deals with experimental research of practical diagnostics measurement tests in industrial power transformers. In practical research we analyze the quality insulation diagnostic. The transformers system insulation is evaluated by using diagnostics of the dissipation factor in data industrial transformer (250 MVA, 15.75/220 kV) application. The insulation quality of power transformer is determined by multiple measurement tests of the insulation resistance winding, capacitance and dielectric dissipation factor. The measurement tests of dissipation factor given at the end of the production cycle not only assures that the quality of the transformer meets the specified levels but also provides insight into the subtleties of the manufacturing process. This paper gives an experimental research of measurement tests setup of dielectric dissipation factor that used GST and Guard mode techniques of earthling systems transformers insulation
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    Application of indirect field oriented control with optimum flux for induction machines drives
    (Springer, 2010) Grouni, S.; Ibtiouen, R.; Kidouche, M.; Touhami, O.
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    Real time rotor flux estimation for induction machine drives : an experimental approach
    (2010) Grouni, S.; Ibtiouen, R.; Kidouche, M.; Touhami, O.
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    Novel loss optimization in induction machines with optimum rotor flux control
    (HyperSciences, 2010) Grouni, S.; Ibtiouen, R.; Kidouche, M.; Touhami, O.
    This paper focus on seeking optimum rotor flux which optimizes total energy control under practical constraints of currents, voltages and speed measurements. Improved flux optimization method is an important criteria to evaluate losses in indirect field oriented control for induction machine drives. The practical usefulness of our control models are evaluated and confirmed through experiments using an induction machine (1.5kW/380V). Simulation and experimental investigation tests are provided to evaluate the consistency and performance of the proposed control model
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    Improvement approach on rotor time constant adaptation with optimum flux in IFOC for induction machines drives
    (2008) Grouni, S.; Ibtiouen, R.; Kidouche, M.; Touhami, O.
    Induction machine models used for steady-state and transient analysis require machine parameters that are usually considered design parameters or data. The knowledge of induction machine parameters is very important for Indirect Field Oriented Control (IFOC). A mismatched set of parameters will degrade the response of speed and torque control. This paper presents an improvement approach on rotor time constant adaptation in IFOC for Induction Machines (IM). Our approach tends to improve the estimation accuracy of the fundamental model for flux estimation. Based on the reduced order of the IM model, the rotor fluxes and rotor time constant are estimated using only the stator currents and voltages. This reduced order model offers many advantages for real time identification parameters of the IM
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    The first integral approach in stability problem of large scale nonlinear dynamical systems
    (2008) Kidouche, M.; Habbi, H.; Zelmat, M.; Grouni, S.
    In analyzing large scale nonlinear dynamical systems, it is often desirable to treat the overall system as a collection of interconnected subsystems. Solutions properties of the large scale system are then deduced from the solution properties of the individual subsystems and the nature of the interconnections. In this paper a new approach is proposed for the stability analysis of large scale systems, which is based upon the concept of vector Lyapunov functions and the decomposition methods. The present results make use of graph theoretic decomposition techniques in which the overall system is partitioned into a hierarchy of strongly connected components. We show then, that under very reasonable assumptions, the overall system is stable once the strongly connected subsystems are stables. Finally an example is given to illustrate the constructive methodology proposed
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    Dynamic flux observation on variable parameters in field oriented control for induction machine drives
    (Springer Berlin Heidelberg, 2013) Grouni, S.; Aibeche, Abderrazak; Akroum, Hamza
    Controlled position of induction machine without mechanical sensor has reached a very high stage of development a good dynamic performance response. However, the accuracy of the rotor position and torque need high estimation technical flux behavior in control drives. This paper deals with an improvement dynamic rotor flux observation for induction machine drives based on real parameters variation in field oriented control strategy. However, the control flux permitting the minimization power loss energy. This work presents the implementation of real flux control behavior in real time for induction machine based on digital signal processing. The Dspace DS1104 controller board is used in the implementation. The main technical control vector is applied under practical currents, voltages, position tracking measurements. All advantages of the controlmodels are illustrated by simulation and experimental results for induction machine (3 kW/380V) drives