Communications Internationales

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    Analysis of small signal in North Africa Inter-Area Power System
    (IEEE, 2019) Tsebia, Mohammed; Bentarzi, Hamid
    The problem of oscillations in the interconnected power system is a subject of study in several regions. As the widening of the interconnected North Africa power system makes the grid very sensitive to low frequency oscillations, the presence of these oscillations can cause significant damage to the interconnection lines. The development of synchrophasor technology makes the system of measuring grid parameters more accurate with real-time synchronization. In this paper we used the PMU (Phasor Measurement Unit) for oscillations detection and signal analysis
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    Improvement of Phasor Measurement Unit Performance
    (2010) OUADI, ABDERRAHMANE; Bentazi, Hamid; MAUN, JEAN CLAUDE
    Fast measurements of the instantaneous amplitude and phase angle of the fundamental components and frequency in three-phase power systems may be investigated with high accuracy through the use of modern power instruments such as Phasor Measurement Unit (PMU). However, this accuracy may be affected by several encountering power disturbances, such as abrupt frequency deviation, fast and slow dc offsets decaying due to sudden current changes, inter-harmonics, etc. To avoid these effects for improving the quality of measurements, this work presents a new method of real-time filtering for removing the unwanted DC offset and hence improving SDFT algorithm. To validate the proposed method, the performances of PMU are tested using the data generated by Simulink/MATLAB simulator. The obtained results are very encouraging
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    A New Approach Applied to Adaptive Centralized Load Shedding Scheme
    (2009) Bentarzi, Hamid; OUADI, ABDERRAHMANE; GHOUT, NADIR; Maamri, Farid; MASTORAKIS, NIKOS E.
    One of major contingencies of an electric power system is due to imbalance between loads and generated power. This leads to instability in the power system and hence to a blackout. A load shedding scheme may be used to avoid such problem by reducing the total load. The aim of this work is to develop a new approach applied to an adaptive load shedding scheme using recent development technology such as wide area synchro-phasor measurement. All generator frequencies that may be measured by phasor measurement units are sent to center where a magnitude of disturbance will be calculated. These measured frequencies also will be used to determine the amount of load to be shed as well as the number of shedding steps
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    Sigmoid function approximation for ANN implementation in FPGA devices
    (2010) Khodja, Djalal Eddine; Kheldoun, Aissa; Refoufi, L.
    The objective of this work is the implementation of Artificial Neural Network on a FPGA board. This implementation aim is to contribute in the hardware integration solutions in the areas such as monitoring, diagnosis, maintenance and control of power system as well as industrial processes. Since the Simulink library provided by Xilinx, has all the blocks that are necessary for the design of Artificial Neural Networks except a few functions such as sigmoid function. In this work, an approximation of the sigmoid function in polynomial form has been proposed. Then, the sigmoid function approximation has been implemented on FPGA using the Xilinx library. Tests results are satisfactory
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    Digital distance relay reliability enhancement using real-time filter
    (2011) Ouadi, Abderrahmane; Bentarzi, Hamid; Maun, Jean Claude
    In the conventional three - zone stepped directional distance scheme, distance relay is used to provide the primary as well as remote backup protection. However, the mal-operation of this relay under stressed conditions such as power swing and switching action transient instability may affect the reliability of the whole protective scheme. The voltage and current phasors needed by the distance relay for determining the impedance may be measured with integrated Phasor Measurement Unit. However, this measurement accuracy may be affected by several power disturbances such as fast and slow dc offsets decaying due to sudden current changes, inter-harmonics, etc. To avoid these effects for improving the quality of measurements and hence the distance relay reliability, this work proposes a new real-time filtering method for removing the unwanted DC offset and hence improving SDFT algorithm. To validate the present method, the performance of developed distance relay is tested using the data generated by Simulink/MATLAB simulator. The obtained simulation results are satisfactory