Proceedings of the 2nd International Conference on Green Energy Conversion System

Inhaltsverzeichnis

1. Frontmatter

2. Atomic Hydrogen Adsorption on Two-Dimensional AlN: DFT Study

   Amina Boudiaf, Malika Gallouze, Abdelhafid Kellou

   Abstract

   Based on Density Functional Theory (DFT) calculations, we investigate the structural and energetics properties of the atomic hydrogen adsorption on two-dimensional (2D) hexagonal AlN. The obtained results show that hydrogen in hollow site induces volume expansion (~ 1.12%) of AlN monolayer. Whereas volume contraction is found for hydrogen in bridge, top Al and top N adsorption sites, due to the slight decrease of the lattice parameters (~ 0.32–0.8%). Hydrogen atom prefers to form a bond with nitrogen than aluminum in AlN monolayer with bond length H-N of 1.05 Å.

3. Site Preference of Hydrogen Atom in Mg3La Alloy: A DFT Study

   N. Mosteghanemi, L. Rabahi, L. Rouaiguia, A. Kellou

   Abstract

   The Pseudo-Potential method (PP) based on Density Functional Theory (DFT), was applied to investigate the site preference of hydrogen atom in the Mg₃La alloy, which exhibits Fcc structure (space group 225). The relative stability of hydrogen atom at various interstitial sites (Wyckoff positions: 24d, 24e, 32f and 48g) was determined, with a particular attention to the hydrogenation effects on the stability and structural properties of the Mg₃La alloy. The results were discussed in the light of the available theoretical and experimental results.

4. Experimental and Digital Simulation Investigations of Harmonics Injection by CFLs into a LV Network

   Mohamed Hajjej, Lassaad Sbita

   Abstract

   Today, the demand for electrical appliances, such as power converters, economic lamps, LEDs, speed drives, and regulators, is increasing in recent years, but despite their robustness and good dynamic responses, they inject harmonic currents into the network. This article presents in-depth studies on the effect of the use of Compact fluorescent lamps CFL on a Low Voltage (LV) local area network, as well as an interest in modeling this type called non-linear charge under PSIM and MATLAB Software.

5. New Hysteresis Control Block for Shunt Active Power Filter for Harmonics Compensation Generated by CFLs with PQ Theory

   Mohamed Hajjej, Lassaad Sbita, Abdelali El Aroudi, Kuntal Mandal

   Abstract

   This paper proposes a New Modulation Hysteresis Control block for a three phase four wire Shunt Active Power Filter (SAPF) for currents harmonics compensation generated by Compact Fluorescents Lamps (CFLs). This study employs the PQ power control strategy. The performance of the SAPF is evaluated under both simple hysteresis controller and under the new modulation hysteresis controller conditions using the Matlab/Simulink platform. The findings simulation results demonstrate that the proposed new technique can improve the power quality of the main, and the total harmonic distortion (THD) optimization, which also confirms the effectiveness of the approach.

6. A Comparative Study of Performed SV PWM Three Phase Inverters Strategies Drive

   Nadia Gasmi, Mouna Ben Hamed

   Abstract

   Sinusoidal pulse width modulation (SPWM) and space vector pulse width modulation (SVPWM) are the most popular modulation strategies for multi-level inverters. This paper provides the theoretical analysis and simulation results of SPWM and SVPWM for three level inverters. This paper focuses on implementation of Space Vector Pulse Width Modulation (SVPWM) Technique for Three level Neutral Point Clamped (NPC) Multilevel Inverter and compare it with Sinusoidal Pulse Width Modulation Technique (SPWM). Simulation results were shown and compared in the view of THD for both the techniques. The result shows that the SVPWM is better for three level NPC inverter in THD point of view.

7. Thermodynamic and Environmental Comparison of Various Recuperated Cycles for Gas Turbine Applications

   Faiza Brahimi, Messaouda Guemmadi

   Abstract

   The considerable amount of energy contained in the exhaust gases of gas turbines represents a valuable potential that cannot be overlooked. The objective of this study is to identify the cycle that contributes the most to improving the performance of the simple gas turbine cycle (Joule-Brayton cycle) and reducing CO₂ emissions to the environment through the recovery of exhaust gases. Many studies have focused on methods for better exploiting this potential. In this context, three different cycles with exhaust gas recovery were analyzed in this work: the cycle with conventional recovery, the cycle with alternative recovery, and the cycle with staged recovery. The aim of this study is to evaluate the benefits of the best cycle with exhaust gas recovery based on energy performance and environmental impact. The energy analysis shows a significant improvement in energy efficiency compared to that of the cycle without recovery. To better understand the behavior of these technologies and achieve their best integration, we analyze the influence of certain key parameters such as compression ratio, ambient temperature, and heat exchanger effectiveness. The results of the environmental analysis show that the amount of CO₂ emissions in the cycles with recovery is significantly reduced.

8. Application of Artificial Intelligence for the Supervision of a Multi-source System

   Chafiaa Serir, Samia Bensmail, Katia Tadjine, Djamila Rekioua

   Abstract

   Renewable energy sources offer unlimited potential for clean electricity production and their usage is rapidly growing. Hybrid energy systems incorporate various sources, requiring efficient control and supervision mechanisms. In this regard, this study proposes an artificial intelligence-based energy management system, utilizing fuzzy logic control, for a hybrid wind/photovoltaic system with battery storage. The proposed approach adjusts the system output to supply the load demand, offering benefits of precise control of the battery's state of charge (SOC) across five states. This is a marked improvement over traditional management systems that rely on two SOC states, namely SOCmin-SOCmax.

9. Renewable Hybrid System with Battery Storage for Water Pumping for Small-Scale Area

   Katia Tadjine, Djamila Rekioua, Pierre-Olivier Logerais, Toufik Rekioua, Chafiaa Serir

   Abstract

   The paper is devoted to a study on design, optimization and experimental study of a renewable hybrid system (photovoltaic/wind turbine) with battery storage. The design of the studied system use the total incident energy approaches to determinate the size of photovoltaic and wind generators. The simulation study has been done under Matlab/Simulink. An application to pumping water is done for four various profiles measured at Bejaia area. To control the water pumping hybrid system, a power management control has been applied to coordinate the different sources. The simulation results obtained are shown and discussed to demonstrate the applicability of the suggested system. The overall hybrid pumping system with batteries has been then investigated by an experimental study, where tests have been made during different days and under various total dynamic heads (TDH) to show the different performances as flow rate and pump efficiency variations of the proposed system. A comparison of simulation and experimental results are presented and analyzed to conclude on the feasibility of the studied system for water pumping needs applied in a small-scale area of Bejaia a Mediterranean region in Algeria.

10. DSP Real-Time Implementation of an Optimized Steady State DFIM Control for Electric Vehicles

    Mouna Zerzeri, Adel Khedher

    Abstract

    The choice of traction motor for the propulsion system is crucial in their design. In order to contribute to the actual research applied to electric vehicle powertrains field, this paper focuses on Doubly-Fed Induction Machines (DFIM) in traction systems. The theoretical study examines the DFIM’s steady-state features and performances based on the d-q reference model. Hence, an optimized control for an accurate rotor voltage amplitude and angle adjusting in steady state is proposed. The obtained reference voltages will be injected into a Voltage Source Inverters (VSI) in both stator and rotor sides, which are controlled through a Space Vector Pulse Width Modulation (SVPWM) technique. The overall of optimized control scheme has been implemented in real-time on a Digital Signal Processor (DSP) and has been experimentally tested on a laboratory prototype designed around two variable speed drives that feed a DFIM. The obtained results show that by properly determining the rotor voltage, the DFIM can operate optimally in a wide range of speed variations.

11. Wind Turbine Emulator Using Three-Level Inverter-Fed Induction Motor Drive Controlled Through DTC Strategy

    Salma Jnayah, Mouna Zerzeri, Intissar Moussa, Adel Khedher

    Abstract

    Induction motors (IM) are widely applied in manifold industrial applications, notably in the renewable energy sector, owing to their low maintenance requirements, economical cost, and high efficiency. This article outlines a Wind Turbine Emulation (WTE) system using a squirrel cage asynchronous machine under Direct Torque Control (DTC) approach. The proposed DTC strategy is based on a three-level Neutral Point Clamped (NPC) inverter fed the IM to proficiently imitate a small-scale wind-turbine behavior in a laboratory setting by regulating the waveform of the speed. The suggested control system reacts effectively as a wind turbine emulator in research laboratory by controlling the speed waveform with minimum torque and flux ripples. The simulation findings, carried out using Matlab/SIMULINK environment, confirmed the suitability of the DTC in WTE application.

12. Experimental and Numerical Investigation on Heat Transfer in Helically Coiled Tube Heat Exchanger Under Constant Wall Heat Flux

    Sami Missaoui, Romdhane Ben Slama, Bechir Chaouachi

    Abstract

    Waste heat recovery from helically coiled tube heat exchanger of a household refrigerator system is attractive due to its free energy consumption for residential and commercial hot water production. In this chapter, we present an experimental and numerical investigation on a modified household refrigerator for hot water production useful for domestic purpose. This device helps undergraduate mechanical engineering students in understanding the basic natural heat transfer phenomenon between the helical condenser coil and the water in the tank. From the results, after 300 min of heating, the maximum water temperature achieved in the cylindrical tank is 51 °C. Therefore, this modified refrigerator can be utilized in hotels, industry and domestic purposes which need hot water.

13. CFD Simulation of Heat Transfer in Helically Coiled Tube Heat Exchanger for Water Heating

    Sami Missaoui, Romdhane Ben Slama, Bechir Chaouachi

    Abstract

    In order to improve the heat transfer in helically coiled tube heat exchanger immersed in the water tank, we have developed a new coupled model containing both domestic refrigerator and water heater. In the numerical simulation, the three dimensional storage tank with immersed helical coil heat exchanger was simplified as an axisymmetric two dimensional model in order to reduce the calculated capacity and a total of mesh volumes. According to the obtained results, this model is able to predict the effect of condenser coil designs on the heating process of the domestic refrigerator coupled with water heating system. The results indicated that the heating characteristics in the variable pitch coil were improved in comparison with that of normal coil.

14. Cost Optimization Based on a Linear Programming Approach for a Hybrid Renewable Energy System

    Ramia Ouederni, Bechir Bouaziz, Faouzi Bacha

    Abstract

    The objectives of the studies presented here are to develop an efficient method adapted to the energy production of an isolated hybrid power system located on the island of Djerba, Tunisia. To this end, we have proposed two optimization methods, based respectively on linear programming (LP) and software (HOMER), with the aim of minimizing the energy cost of the hybrid system while respecting constraints linked to all the elements of the system. We therefore compared the two optimization strategies. The proposed linear program yields an electricity cost of 0.206$/kWh, lower than the HOMER cost of 0.308$/kWh. This system would therefore have advantages in terms of energy independence in particular.

15. Power Comparative Analysis of Floating and Conventional Solar Photovoltaic System

    Chayma Saad, Mohamed Naoui, Aymen Flah

    Abstract

    Photovoltaic (PV) solar power systems are gaining ground worldwide and represent a promising alternative to renewable energy generation. However, many studies have highlighted some disadvantages associated with the installation and operation of conventional solar power plants. Therefore, floating photovoltaic systems (FPV) have emerged as a new solar energy concept to reduce the negative impact on the environment caused by traditional photovoltaic system configurations. The FPV market has grown at an impressive rate over the past decade, with global installed capacity doubling year-on-year. This growth has been made possible due to the numerous advantages that FPV systems have over conventional systems, primarily related to land use and energy efficiency. The purpose of the study was to compare the FPV system with the conventional PV system (CPV). This research uses the MATLAB Simulink platform to simulate the entire block, and adapts the common photovoltaic power generation model to the floating solar photovoltaic power generation.

16. A Comparative Analysis of PID and SMC Control Topology for the Two Phases Interleaved DC DC Converter

    Gaied Hajer, Naoui Mohamed, Flah Aymen

    Abstract

    The topology of a bidirectional DC-DC converter is typically crucial in systems that require the bidirectional exchange of electricity. It is frequently used in composite energy storage and microgrids. Electric cars, systems, etc. The architecture is interleaved to increase power handling capability and decrease input side ripple current. By allowing current sharing between several phases, interleaving improves the converter’s power density by allowing for a smaller filter inductor and input and output capacitors. An N-phase non-isolated bidirectional DC-DC converter’s design and generalized phase shift specifications are presented in this publication. In MATLAB/Simulink, a two-phase non-isolated interleaved bidirectional DC-DC converter’s closed-loop simulation is performed while taking into account both the boost and buck modes of operation. The outcomes demonstrate equitable current sharing between phases, which lowers input current ripple, reduces the size of filter elements, and enhances converter thermal distribution. When integrating with non-isolated DC-DC converters in power systems, control strategies like proportional integral derivative (PID) and slide mode control (SMC) are also examined in terms of the parameters settling issue, response time, and complexity.

17. Sliding-Mode and Lyapunov Function Based Control for a DC Microgrid with Renewable Generation a Solid Oxide Fuel Cell and Battery Storage

    Mohamed Taieb Krakdia, Habib Kraiem, Lassaad Sbita

    Abstract

    In this paper, we propose a sliding mode and Lyapunov Function based control for a DC microgrid. The microgrid involving renewable distributed generators (PV system and wind turbine), energy storage system (Battery), a solid oxide fuel cell a dump load (aqua_electrolyzer) connected to the same dc bus and an inverter connected to LCL filter which is connected to an AC load Fig. 1. The behavior of the whole system is represented by mathematical models derived from the different sources of the microgrid the dump load and the storage system are presented in Sect. 2. The decentralized control of the microgrid components are depicted with synoptic figures presented in Sect. 2. The energy management algorithm is adopted to ensure the power balance under variable power generation. Simulation results demonstrate that the proposed control method has acceptable performance, including robust tracking and a velvety transition under generation scenario and load power variation in the large range.

18. Boost DC–DC Converter with MPPT for PV Application

    Gasmi Nadia, Ben Hamed Mouna

    Abstract

    The DC/DC converters are widely used in photovoltaic generation systems as interfaces between the photovoltaic panels and the load, enabling the maximum power point (MPP) follow-up. To extract the maximum power, it is necessary to adjust the load to match the current and voltage of the solar panel. The converter must be designed to be directly connected to the photovoltaic panel and perform operations to search for the maximum power point (MPPT). DC/DC converters, together with maximum power point tracking systems (MPPT), are used to avoid these losses.