Publications Scientifiques
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Item Design of an Advanced Optimal Fuzzy Controller For a Binary Distillation Column(Université M'hamed Bougara de Boumerdès, 2024) Bendib, Riad; Mechhoud, El-arkam; Bentarzi, Hamid; Batout, NaoualThe most common control philosophy followed in the chemical process industries is the SISO system using the conventional PID controller algorithms. One drawback is relying on models for both control and design work in Chemical process industries (CPI) is that many problems are very complex and accurate models are difficult, if not impossible to obtain. To overcome these problems, it will be helpful to apply techniques that use human judgment and experience rather than precise mathematical models, which in the major cases deduced from the linearization of the system and simplification hypothesis. The fuzzy logic systems are capable of handling complex, nonlinear systems using simple solutions. However, obtaining an optimal set of fuzzy membership functions is not an easy task. In this chapter a solution based on artificial intelligence is proposed to improve the control of a binary distillation column. The solution is based on the use of the advantages of both fuzzy logic and genetic algorithms. The fuzzy logic is used as a supervisory PI controller that is a simple PI controller that generally used in controlling distillation columns with parameters deduced from the fuzzy supervisor. The membership functions shape is deduced by using research algorithms based on hierarchical genetic algorithms. The results show that the Fuzzy supervisory PI controller provide an excellent tracking toward set point changeItem An application of PMU in solar energy generation Plant Connected Power Grid(2019) Mahboubi, Meriem; Bentarzi, Hamid; Ouadi, AbderahmaneSolar energy is one of the most abundant green energies in our planet. In order to satisfy the world demand of electrical energy, solar energy may be used. Identical to all other types of power generation plants, the integration of the solar energy source in power grid has an impact on its operation. Thus, when the electrical power is injected into the power grid by the solar energy source, the system electrical parameters must be well monitored for synchronization purpose. This can be accomplished with the aid of synchro-phasors measurement units. The phase angle of the utility is a critical parameter for the operation of power devices feeding power into the grid like PV inverters. There are many techniques to obtain the grid phase angle such as the zero-crossing detection and the orthogonal phase locked loop. This research work discusses the use of PMUs (Phasor Measurement Unit) for providing this important parameter to system synchronization in the case of high penetration of solar energy in the power gridItem Photovoltaic panel parameters estimation using grey wolf optimization technique †(MDPI, 2022) Touabi, Cilina; Bentarzi, HamidIn different photovoltaic PV applications, it is very important to model the PV cell. However, the model parameters are usually unavailable in the datasheet provided by the manufacturers and they change due to degradation. This paper presents a method for identifying the optimal parameters of a PV cell. This method is based on the one diode model using the grey wolf algorithm as well as datasheets. An algorithm is implemented in a SIMULINK simulator for making the I-V and P-V characteristics. This approach is found to be useful for designers due to its simplicity, fastness, and accuracy. The final results are compared to demonstrate the efficiency and accuracy of the proposed methodItem Sub-Synchronous torsional interaction study and mitigation using a synchro-phasors measurement Unit †(MDPI, 2022) Tsebia, Mohammed; Bentarzi, HamidIn a power plant, sub-synchronous resonance is not encountered very often, but when it occurs, it can cause a very serious problem and severe damage. Many efforts have been investigated to study and hence mitigate a resonance produced between electrical synchronous machines and the electrical grid that may arise for frequencies other than the fundamental one (50 Hz). Natural resonances in the electrical grid incorporating series capacitors can appear for sub-synchronous frequencies and can be both a series and parallel resonance nature. Mitigation techniques are required for a power plant with an extensive turbine-generator string located near a long power transmission line with series capacitors. Due to the severe consequences, power plants that risk sub-synchronous resonance (SSR) may be equipped with appropriate protection. However, if the sub-synchronous resonance frequencies of the network coincide with any of the mechanical frequencies of the turbine-generator shaft, torsional interaction that is called sub-synchronous torsional interaction (SSTI). If the electrical damping for a specific frequency in the network is insufficient or negative in comparison to mechanical damping, it may lead to this sub-synchronous torsional interaction. This phenomenon can be hazardous causing fatigue in the turbine-generator shaft, which results in the failure of the power generation unit. It can also occur due to the interaction between a control system of converters and the turbine generators. In this research paper, a study using different methods of analysis developed by transmission system operators (TSOs) and the manufacturers with one case study is presented. Additionally, different mitigation techniques, such as filtering and damping, are suggested. Furthermore, a demonstration for measuring principles as well as monitoring and protection against SSTI using a synchro-phasors measurement unit has been presentedItem Reduction in the use of fossil fuels by improving the interconnection power system oscillation(Institute of Advanced Engineering and Science, 2023) Tsebia, Mohammed; Bentarzi, HamidMany international organizations have called for reducing usage of renewable energy as a means to reduce carbon dioxide emissions, this paper studies the case of electricity production based to fossil fuels. Currently existing solutions is to shift from fossil fuels to clean renewable energy. Electrical interconnections are used between large-scale areas; these interconnections have a major problem that is the phenomenon of oscillations. The amount of fossil energy used by power plants depends on the electrical load required. with these conditions it is not possible to reduce the amount of energy required to satisfy the electrical load required. The solution proposed in this paper is the improvement of interarea oscillation using phasor measurement unit technology for real-time monitoring and accuracy of measurements. We tested the proposed solution for the north African power system. The results show the importance of improving interconnection networks to reduce fossil fuels useItem Frequency control system effectiveness in a combined cycle gas turbine plant †(MDPI, 2022) Talah, Djamila; Bentarzi, HamidCombined cycle gas turbines (CCGTs) have considerable merits and are mainly the most frequently researched topics in power generation, due to their attractive performance characteristics and low-emission combustion system. A change in power demands throughout a power system is reflected by a change in the frequency in the network. Therefore, a significant loss in a power system without a suitable control system can cause an extreme frequency disturbance in the network. However, it has been observed that many research studies have focused on control issues and voltage stability, contrary to frequency control, which receives less interest in this field. Considering these remarks, our contribution deals with the frequency control system. This study focuses on the effectiveness of the frequency control system in a combined cycle gas turbine plant. Thus, a dynamic model for a CCGT plant has been developed in MATLAB/Simulink, and the power system responses are examined following the frequency deviationItem An investigation of different PMU phasor estimation techniques based on DFT using MATLAB(IEEE, 2020) Mahboubi, Meriem; Bentarzi, Hamid; Ouadi, AbderrahmanePhasor Measurement Unit (PMU) is the essential component in the modern power grid which plays a significant role in monitoring, control and protection of the power system networks in real time. PMUs are able to provide time stamped synchronized measurements of voltage and current phasors using Global Positioning System (GPS) satellites, in microseconds, to maintain the power system network free of faults and hence healthy. Different phasor estimation techniques such as Kalman filter and Discrete Fourier transform (DFT) may be used by PMUs to estimate phasors. In this research work, the implementation of non-recursive, recursive and smart DFT techniques have been investigated for modeling the PMU using MATLAB. Then, mathematical differences among these algorithms are briefly highlighted as well as advantages and drawbacks of eachItem Enhanced positive-offset mho element loe protection of synchronous generator in the presence of statcom(Université Djillali Liabas SIDI BELABBES ALGERIE, 2020) Ayache, Mati; Bentarzi, HamidThis research work presents an enhancement in the positive offset mho element that may be used in the loss of excitation (LOE) protection scheme of synchronous generator associated with a static synchronous compensator (STATCOM) in transmission line. This enhanced element of the protection scheme is based on recalculating the impedance at the relay location by eliminating the injected STATCOM current measured by phasor measurement unit (PMU). Under total or partial loss of excitation condition, the simulation results show that the new developed method improves the operation of the positive offset LOE protection by reducing the delay time that may be due to the presence of STATCOM.Item Memetic Algorithm for Coordinated design of Power System Stabilizers in multimachine system(IEEE, 2019) Baadji, Bousaadia; Bentarzi, Hamid; Belagoune, Soufianea memetic algorithm is proposed for the coordinated design of power system stabilizers in multimachine power system in order to mitigate the electromechanical oscillations and enhance the system stability.The memetic algorithm is based on the combination traditional genetic algorithm and the Nelder-mead local search method in order to balance between the diversification and intensification so as to find the optimal parameters of the PSSs.The nonlinear simulation and Eigen analysis on the three machine nine bus system (WSCC) demonstrates the potential of the proposed controllers in the enhancement of the overall system stabilityItem State feedback linearization using block companion similarity transformation(Institute of Advanced Engineering and Science, 2021) Kessal, Farida; Hariche, Kamel; Bentarzi, Hamid; Boushaki, RazikaIn this research work, a new method is proposed for linearizing a class of nonlinear multivariable system; where the number of inputs divides exactly the number of states. The idea of proposed method consists in representing the original nonlinear system into a state-dependent coefficient form and applying block similarity transformations that allow getting the linearized system in block companion form. Because the linearized system’s eigenstructure can determine system performance and robustness far more directly and explicitly than other indicators, the given class multivariable system is chosen. Examples are used to illustrate the application and show the effectiveness of the given approach