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Prof. Mohamed Orabi
Dupty Dean< Faculty of Engineering, Aswan University

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0 Power Electronics
0 Power Supply Design
0 Photovoltaic System and Energy
0 LED drivers
0 Electric Vehicle Charging

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Journal article
Published: 24 August 2021 in Sustainability
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Switched reluctance machines (SRMs) have received increasing attention for their many potential uses, such as for wind power and electric vehicle (EV) drive systems. The Quasi-Z-source Integrated Multiport Converter (QZIMPC) was recently introduced to improve the reliability of the SRM driver through small capacitance values. It is not possible, however, to simultaneously energize and deenergize two SRM phases in QZIMPC. This phenomenon can significantly increase the commutation period which, in turn, degrades the performance of SRM; in addition, this causes high-voltage ripples on the converter’s capacitors. Two switching algorithms are introduced and applied in this paper, and their performance with SRM is investigated in terms of torque ripple and peak phase current. The algorithms are based on prioritizing the control command in the on-going and off-going phases to fulfill the required load torque, as well as to accelerate the commutation process where possible. This is achieved without the interference of high-level controllers, which include speed controllers and/or torque ripple minimization. Through the simulation results, a comparison between the two switching algorithms is presented to determine their potential to improve the SRM drive system’s performance.

ACS Style

Mahmoud A. Gaafar; Arwa Abdelmaksoud; Mohamed Orabi; Hao Chen; Mostafa Dardeer. Performance Investigation of Switched Reluctance Motor Driven by Quasi-Z-Source Integrated Multiport Converter with Different Switching Algorithms. Sustainability 2021, 13, 9517 .

AMA Style

Mahmoud A. Gaafar, Arwa Abdelmaksoud, Mohamed Orabi, Hao Chen, Mostafa Dardeer. Performance Investigation of Switched Reluctance Motor Driven by Quasi-Z-Source Integrated Multiport Converter with Different Switching Algorithms. Sustainability. 2021; 13 (17):9517.

Chicago/Turabian Style

Mahmoud A. Gaafar; Arwa Abdelmaksoud; Mohamed Orabi; Hao Chen; Mostafa Dardeer. 2021. "Performance Investigation of Switched Reluctance Motor Driven by Quasi-Z-Source Integrated Multiport Converter with Different Switching Algorithms." Sustainability 13, no. 17: 9517.

Journal article
Published: 21 June 2021 in IEEE Transactions on Applied Superconductivity
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The eddy-current loss of switched reluctance motor (SRM) is studied and analyzed in this paper. As a significant part of core loss, eddy-current loss has a great influence on motor perfor-mance. First, the average magnetic flux waveforms in every dis-tributed region were derived from the magnetic equivalent circuit (MEC) model. Based on this, each harmonic of magnetic density was obtained by adopting the fast Fourier transform (FFT) method for further calculation. Then, each harmonic eddy-current loss is computed by sinusoidal magnetic density and the total eddy-current loss in different region of motor is derived by superposing of them. Therefore, the calculated results at different speed and various conduction angles of each region are analyzed. Finally, the 3D finite element (FE) model is established in soft-ware FLUX and the experimental platform of SRM prototype is built.

ACS Style

Hao Chen; Fengyuan Yu; Wenju Yan; Mohamed Orabi. Calculation and Analysis of Eddy-Current Loss in Switched Reluctance Motor. IEEE Transactions on Applied Superconductivity 2021, PP, 1 -1.

AMA Style

Hao Chen, Fengyuan Yu, Wenju Yan, Mohamed Orabi. Calculation and Analysis of Eddy-Current Loss in Switched Reluctance Motor. IEEE Transactions on Applied Superconductivity. 2021; PP (99):1-1.

Chicago/Turabian Style

Hao Chen; Fengyuan Yu; Wenju Yan; Mohamed Orabi. 2021. "Calculation and Analysis of Eddy-Current Loss in Switched Reluctance Motor." IEEE Transactions on Applied Superconductivity PP, no. 99: 1-1.

Original paper
Published: 20 January 2021 in International Journal of Circuit Theory and Applications
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This paper proposes three‐phase microinverter able to process the power of three PV modules simultaneously and independently; thus, efficient utilization of PV modules through distributed maximum power point tracking (DMPPT) is realized. The proposed microinverter employs switched capacitors (SCs) networks combined with three‐phase voltage source inverter; it is named switched capacitor buck‐boost voltage source inverter and abbreviated as SC‐BBVSI. The connections of SCs networks are determined to fulfill the high boosting gain along with minimized leakage currents. In addition, low capacitances values can be employed for power decoupling purpose. Thus, in addition to DMPPT feature, three features of high boosting gain, high‐reliable product, and minimized leakage current are realized without using the bulky and costly isolation transformer. In this paper, the operation modes of SC‐BBVSI for single and multi‐input scenarios are explained. The modulation strategy to realize these modes along with the control system design is presented as well. The relations required to design the passive elements and identify the device's stresses are derived. The features of the proposed microinverter are confirmed through detailed comparison with other recently reported topologies. Both simulation and experimental results are provided to verify the features of the proposed topology.

ACS Style

Mahmoud A. Gaafar; Eltaib Abdeen Ibrahim; Mohamed Orabi. Multi‐input transformer‐less four‐wire microinverter with distributed MPPT for PV systems. International Journal of Circuit Theory and Applications 2021, 49, 1704 -1725.

AMA Style

Mahmoud A. Gaafar, Eltaib Abdeen Ibrahim, Mohamed Orabi. Multi‐input transformer‐less four‐wire microinverter with distributed MPPT for PV systems. International Journal of Circuit Theory and Applications. 2021; 49 (6):1704-1725.

Chicago/Turabian Style

Mahmoud A. Gaafar; Eltaib Abdeen Ibrahim; Mohamed Orabi. 2021. "Multi‐input transformer‐less four‐wire microinverter with distributed MPPT for PV systems." International Journal of Circuit Theory and Applications 49, no. 6: 1704-1725.

Journal article
Published: 10 September 2020 in Energies
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This study proposes a classical control algorithm for solving the transcendental set of equations for the unequal DC sources of five-level multilevel inverters (MLIs). Such sources can be generated from renewable energy sources. Two DC sources with different values are used to produce an output voltage with five levels. Then, a set of two transcendental equations is formulated with two targeted functions to control the fundamental component and cancel the stipulated single harmonic order. The proposed solution uses a simple classical proportional control with two loops to generate two switching angles. The first switching angle is assigned with an initial value, whereas the second one is calculated from the inner loop. The outer loop is used to cancel the specified harmonic by sending the error signal to the proposed proportional control that tunes the switching angles. The proposed algorithm is easy, fast, and accurate, and has a wide-range solution in terms of modulation index (MI ) and input DC source ratio (x=V1V2≤1). The proposed algorithm is tested for a wide range of MI and x to verify its feasibility. Moreover, several simulation and laboratory tests are presented to further validate the applicability of the proposed approach.

ACS Style

Mahrous Ahmed; Essam Hendawi; Basem Alamri; Mosleh Alharthi; Farhan Salem; Mohamed Orabi; Saad Mekhilef; Sherif Ghoneim. Classical Control for Unequal DC Sources Five-Level Inverter-Based SHE Technique. Energies 2020, 13, 4715 .

AMA Style

Mahrous Ahmed, Essam Hendawi, Basem Alamri, Mosleh Alharthi, Farhan Salem, Mohamed Orabi, Saad Mekhilef, Sherif Ghoneim. Classical Control for Unequal DC Sources Five-Level Inverter-Based SHE Technique. Energies. 2020; 13 (18):4715.

Chicago/Turabian Style

Mahrous Ahmed; Essam Hendawi; Basem Alamri; Mosleh Alharthi; Farhan Salem; Mohamed Orabi; Saad Mekhilef; Sherif Ghoneim. 2020. "Classical Control for Unequal DC Sources Five-Level Inverter-Based SHE Technique." Energies 13, no. 18: 4715.

Journal article
Published: 13 July 2020 in IEEE Transactions on Power Electronics
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The modulation signal of current source inverter (CSI) contains an overlap instant to prevent interrupting the dc current of the bulky input inductor. This overlap instant, located between vector states, results in output vector deviation errors which in turns leads to low order harmonics in the output waveform. These harmonics are difficult to reject by the output filter. In this paper, a novel modulation method is developed to realize zero-vector deviation error, and hence eliminate the impact of the overlap instant. The Ampere-Second balance principle is applied to obtain the deviation error expression over the full range of the power factor angle. The mathematical expression of the vector deviation angle is derived in terms of the overlap time. Experimental results are provided to declare the effectiveness of the proposed modulation method.

ACS Style

Mahmoud Gaber; Omar Abdel-Rahim; Mohamed Orabi. Novel Overlap Method to Eliminate Vector Deviation Error in SVM of Current Source Inverters. IEEE Transactions on Power Electronics 2020, 36, 1 -1.

AMA Style

Mahmoud Gaber, Omar Abdel-Rahim, Mohamed Orabi. Novel Overlap Method to Eliminate Vector Deviation Error in SVM of Current Source Inverters. IEEE Transactions on Power Electronics. 2020; 36 (2):1-1.

Chicago/Turabian Style

Mahmoud Gaber; Omar Abdel-Rahim; Mohamed Orabi. 2020. "Novel Overlap Method to Eliminate Vector Deviation Error in SVM of Current Source Inverters." IEEE Transactions on Power Electronics 36, no. 2: 1-1.

Journal article
Published: 18 June 2020 in Energies
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The increase in operating temperature of PV generators leads to degradation of their performance. These adverse effects of high temperatures are considered as one of the most important problems that solar panel operation faces in hot weather areas. A lot of research has been undertaken to study this aspect and find ways of limiting the harm caused by such high temperatures. To overcome this harm and to maintain the operating temperature of the PV cells within the optimum range specified by manufacturers, cooling the solar panels often becomes indispensable. This paper discusses the heat transfer through the solar panel layers and studies the effect of high temperature on the solar panel performance in a hot desert environment. It also presents the development of a new solar panel structure viz. by installing an aluminum heat sink to reduce the effect of temperature rise and thus improve the solar panel performance. The study focuses on a pole-mounted solar panel for a street lighting apparatus in extremely hot desert conditions with fluctuating wind speeds. It will be shown that adding an aluminum heat sink to the solar panel bottom mitigates the effect of increased temperature and hence modifies the solar panel operating point by increasing both the efficiency and the lifetime. The solar cell temperature is decreased by 16.4% as a result of the aluminum heat sink installation on the solar panel back sheet and consequently, the accumulated energy produced by the the solar panel is increased by 13.23% per day.

ACS Style

Youssef Hassan; Mohamed Orabi; Abdulaziz Alshreef; Omar M. Al-Rabghi; Badr A. Habeebullah; Abdelali El Aroudi; Mohamed A. Ismeil. Improvement of Extracted Power of Pole Mounted Solar Panels by Effective Cooling Using Aluminum Heat Sink under Hot Weather and Variable Wind Speed Conditions. Energies 2020, 13, 3159 .

AMA Style

Youssef Hassan, Mohamed Orabi, Abdulaziz Alshreef, Omar M. Al-Rabghi, Badr A. Habeebullah, Abdelali El Aroudi, Mohamed A. Ismeil. Improvement of Extracted Power of Pole Mounted Solar Panels by Effective Cooling Using Aluminum Heat Sink under Hot Weather and Variable Wind Speed Conditions. Energies. 2020; 13 (12):3159.

Chicago/Turabian Style

Youssef Hassan; Mohamed Orabi; Abdulaziz Alshreef; Omar M. Al-Rabghi; Badr A. Habeebullah; Abdelali El Aroudi; Mohamed A. Ismeil. 2020. "Improvement of Extracted Power of Pole Mounted Solar Panels by Effective Cooling Using Aluminum Heat Sink under Hot Weather and Variable Wind Speed Conditions." Energies 13, no. 12: 3159.

Journal article
Published: 07 June 2020 in Energies
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Microinverters are an essential part of the photovoltaic (PV) industry with significant exponential prevalence in new PV module architectures. However, electrolyte capacitors used to decouple double line frequency make the single-phase microinverters topologies the slightest unit in this promising industry. Three-phase microinverter topologies are the new trend in this industry because they do not have double-line frequency problems and they do not need the use of electrolyte capacitors. Moreover, these topologies can provide additional features such as four-wire operation. This paper presents a detailed discussion of the strong points of three-phase microinverters compared to single-phase counterparts. The developed topologies of three-phase microinverters are presented and evaluated based on a new classification based on the simplest topologies among dozens of existing inverters. Moreover, the paper considers the required standardized features of PV, grid, and the microinverter topology. These features have been classified as mandatory and essential. Examples of the considered features for classifications are Distributed Maximum Power Point Tracking (DMPPT), voltage boosting gain, and four-wire operation. The developed classification is used to identify the merits and demerits of the classified inverter topologies. Finally, a recommendation is given based on the classified features, chosen inverter topologies, and associated features.

ACS Style

Ahmed Shawky; Mahrous Ahmed; Mohamed Orabi; Abdelali El Aroudi. Classification of Three-Phase Grid-Tied Microinverters in Photovoltaic Applications. Energies 2020, 13, 1 .

AMA Style

Ahmed Shawky, Mahrous Ahmed, Mohamed Orabi, Abdelali El Aroudi. Classification of Three-Phase Grid-Tied Microinverters in Photovoltaic Applications. Energies. 2020; 13 (11):1.

Chicago/Turabian Style

Ahmed Shawky; Mahrous Ahmed; Mohamed Orabi; Abdelali El Aroudi. 2020. "Classification of Three-Phase Grid-Tied Microinverters in Photovoltaic Applications." Energies 13, no. 11: 1.

Journal article
Published: 20 March 2020 in Energies
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Maximum Power Point Tracking (MPPT) control is an essential part of every photovoltaic (PV) system, in order to overcome any change in ambient environmental conditions and ensure operation at maximum power.. Recently, micro-inverters have gained a lot of attention due to their ability to track the true MPP for each individual PV module, which is considered a powerful solution to overcome the partial shading and power mismatch problems which exist in series-connected panels. Although the LLC resonant converter has high efficiency and high boosting ability, traditional MPPT techniques based on Pulse Width Modulation (PWM) do not work well with it. In this paper, a fixed frequency predictive MPPT technique is presented for the LLC resonant converter to be used as the first-stage in a PV micro-inverter. Using predictive control enhances the tracking efficiency and reduces the steady state oscillation. Operation with fixed switching frequency for the LLC resonant converter improves the total harmonic distortion profile of the system and ease the selection of circuit magnetic component. To demonstrate the effectiveness of the proposed MPPT technique, the system is simulated using MATLAB/Simulink platform. Furthermore, a 150 W hardware prototype is developed and tested. Both simulation and experimental results are consistent and validate the proper operation of the developed system.

ACS Style

Omar Abdel-Rahim; Nehmedo Alamir; Mohamed Abdelrahem; Mohamed Orabi; Ralph Kennel; Mohamed A. Ismeil. A Phase-Shift-Modulated LLC-Resonant Micro-Inverter Based on Fixed Frequency Predictive-MPPT. Energies 2020, 13, 1460 .

AMA Style

Omar Abdel-Rahim, Nehmedo Alamir, Mohamed Abdelrahem, Mohamed Orabi, Ralph Kennel, Mohamed A. Ismeil. A Phase-Shift-Modulated LLC-Resonant Micro-Inverter Based on Fixed Frequency Predictive-MPPT. Energies. 2020; 13 (6):1460.

Chicago/Turabian Style

Omar Abdel-Rahim; Nehmedo Alamir; Mohamed Abdelrahem; Mohamed Orabi; Ralph Kennel; Mohamed A. Ismeil. 2020. "A Phase-Shift-Modulated LLC-Resonant Micro-Inverter Based on Fixed Frequency Predictive-MPPT." Energies 13, no. 6: 1460.

Journal article
Published: 27 December 2019 in IEEE Access
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This paper presents a new boost inverter topology with nine level output voltage waveform using a single dc source and two switched capacitors. The capacitor voltages are self-balancing and thus is devoid of any sensors and auxiliary circuitry. The output voltage is twice higher than the input voltage, which eliminates the need for an input dc boost converter especially when the inverter is powered from a renewable source. The merits of the proposed topology in terms of the number of devices and cost are highlighted by comparing the recent and conventional inverter topologies. In addition to this, the total voltage stress of the proposed topology is lower and have a maximum efficiency of 98.25%. The operation and dynamic performance of the proposed topology have been simulated using PLECS software and are validated using an experimental setup considering a different dynamic operation.

ACS Style

Marif Daula Siddique; Basem Alamri; Farhan A. Salem; Mohamed Orabi; Saad Mekhilef; Noraisyah Mohamed Shah; N. Sandeep; Jagabar Sathik Mohamed Ali; Atif Iqbal; Mahrous Ahmed; Sherif S. M. Ghoneim; Mosleh M. Al-Harthi. A Single DC Source Nine-Level Switched-Capacitor Boost Inverter Topology With Reduced Switch Count. IEEE Access 2019, 8, 5840 -5851.

AMA Style

Marif Daula Siddique, Basem Alamri, Farhan A. Salem, Mohamed Orabi, Saad Mekhilef, Noraisyah Mohamed Shah, N. Sandeep, Jagabar Sathik Mohamed Ali, Atif Iqbal, Mahrous Ahmed, Sherif S. M. Ghoneim, Mosleh M. Al-Harthi. A Single DC Source Nine-Level Switched-Capacitor Boost Inverter Topology With Reduced Switch Count. IEEE Access. 2019; 8 (99):5840-5851.

Chicago/Turabian Style

Marif Daula Siddique; Basem Alamri; Farhan A. Salem; Mohamed Orabi; Saad Mekhilef; Noraisyah Mohamed Shah; N. Sandeep; Jagabar Sathik Mohamed Ali; Atif Iqbal; Mahrous Ahmed; Sherif S. M. Ghoneim; Mosleh M. Al-Harthi. 2019. "A Single DC Source Nine-Level Switched-Capacitor Boost Inverter Topology With Reduced Switch Count." IEEE Access 8, no. 99: 5840-5851.

Journal article
Published: 13 September 2019 in IEEE Transactions on Power Electronics
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This paper proposes a novel single-phase micro-inverter fit to process the power of two photovoltaic (PV) modules; in a modular way. The proposed topology combines a full bridge inverter integrated with two DC-DC boost converters, in addition to a DC link consists of switched capacitor (SC) networks. The operating modes of the proposed topology are illustrated. The voltage stress of all components is identified. A modulation technique along with a control system are developed for proper operation of the proposed topology. A comparative study with other topologies is introduced and shows the following merits for the proposed one: 1) the power of two PV modules can be harvested individually or simultaneously without any circulating current issues, 2) very high gain can be acquired; thus no series connection of PV modules is required for grid-tie applications, 3) Transformer-less operation, 4) multi-level shaping of the output voltage; thus reduced filter size is required, and 5) self-balancing for the DC-link capacitors; thus simple control systems can be used. The performance of the 7-level version of the proposed topology is validated using real-time simulation and experimental prototype under grid-tie and stand-alone conditions, respectively

ACS Style

Eltaib Abdeen D. Ibrahim; Mahmoud A. Gaafar; Mohamed Orabi; Ahmed Sheir; Mohamed Z. Youssef; Eltaib Abedeen. A Novel Dual-Input High-Gain Transformerless Multilevel Single-Phase Microinverter for PV Systems. IEEE Transactions on Power Electronics 2019, 35, 4703 -4714.

AMA Style

Eltaib Abdeen D. Ibrahim, Mahmoud A. Gaafar, Mohamed Orabi, Ahmed Sheir, Mohamed Z. Youssef, Eltaib Abedeen. A Novel Dual-Input High-Gain Transformerless Multilevel Single-Phase Microinverter for PV Systems. IEEE Transactions on Power Electronics. 2019; 35 (5):4703-4714.

Chicago/Turabian Style

Eltaib Abdeen D. Ibrahim; Mahmoud A. Gaafar; Mohamed Orabi; Ahmed Sheir; Mohamed Z. Youssef; Eltaib Abedeen. 2019. "A Novel Dual-Input High-Gain Transformerless Multilevel Single-Phase Microinverter for PV Systems." IEEE Transactions on Power Electronics 35, no. 5: 4703-4714.

Journal article
Published: 02 August 2019 in IEEE Journal of Emerging and Selected Topics in Power Electronics
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This paper proposes a general mathematical solution for a selected harmonic elimination (SHE) technique. The proposed procedure is valid for both symmetrical and unsymmetrical MLI inverter configurations with a wide range of modulation indexes (mi). The proposed procedure eliminates targeted number of harmonics ’l ’ for switching angles NS= 2l regardless to the MLI output waveform levels. The proposed procedure receives the DC sources values and ratios, and then it calculates the NS values to generate a suitable set of harmonic equations. In this proposed algorithm, the nonlinear transcendental harmonic equations were transformed into a linear system of equations (A X=B); the resulting equations can be solved online easily by formulating matrix A and matrix B, then multiplying the inversion of matrix A in matrix B. It has been found that, only the last element in matrix B needs to be updated for each change in modulation index or in the ac output fundamental component, resulting in reduced computation time. The proposed technique generates the switching angles α1,α2,...,αk based on a preset objective functions. The simulation and experimental results in some selected cases are provided to validate the proposed algorithms.

ACS Style

Mahrous Ahmed; Mohamed Orabi; Sherif Ghoneim; Mosleh Alharthi; Farhan Salem; Bassem Alamri; Saad Mekhilef. General Mathematical Solution for Selective Harmonic Elimination. IEEE Journal of Emerging and Selected Topics in Power Electronics 2019, 1 -1.

AMA Style

Mahrous Ahmed, Mohamed Orabi, Sherif Ghoneim, Mosleh Alharthi, Farhan Salem, Bassem Alamri, Saad Mekhilef. General Mathematical Solution for Selective Harmonic Elimination. IEEE Journal of Emerging and Selected Topics in Power Electronics. 2019; (99):1-1.

Chicago/Turabian Style

Mahrous Ahmed; Mohamed Orabi; Sherif Ghoneim; Mosleh Alharthi; Farhan Salem; Bassem Alamri; Saad Mekhilef. 2019. "General Mathematical Solution for Selective Harmonic Elimination." IEEE Journal of Emerging and Selected Topics in Power Electronics , no. 99: 1-1.

Journal article
Published: 26 July 2019 in Automatika
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ACS Style

Mahrous Ahmed; Mohamed Orabi; Sherif Ghoneim; Mosleh Alharthi; Farhan Salem; Bassem Alamri; Saad Mekhilef. Selective harmonic elimination method for unequal DC sources of multilevel inverters. Automatika 2019, 60, 378 -384.

AMA Style

Mahrous Ahmed, Mohamed Orabi, Sherif Ghoneim, Mosleh Alharthi, Farhan Salem, Bassem Alamri, Saad Mekhilef. Selective harmonic elimination method for unequal DC sources of multilevel inverters. Automatika. 2019; 60 (4):378-384.

Chicago/Turabian Style

Mahrous Ahmed; Mohamed Orabi; Sherif Ghoneim; Mosleh Alharthi; Farhan Salem; Bassem Alamri; Saad Mekhilef. 2019. "Selective harmonic elimination method for unequal DC sources of multilevel inverters." Automatika 60, no. 4: 378-384.

Journal article
Published: 24 June 2019 in Canadian Journal of Electrical and Computer Engineering
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This paper introduces a generalized platform for the design selection of multilevel inverters (MLIs) topologies for any industry, especially in low- and medium-power applications. This platform is novel as it combines the component count and stress in any MLI in a normalized unique score. Each MLI topology is designed to match specific criteria to meet a specific application, which introduces diversified sets of merits and demerits in each case. Therefore, choosing a suitable MLI topology for the specific application is rather a difficult, time-consuming, and complex process. Moreover, the comparison can only be conducted between MLI topologies that fall under the same category. This paper introduces a comprehensive study to propose a new benchmark (BM) which can be used to compare MLI topologies regardless of their constructions or oriented applications. Each MLI topology gets a BM score based on comparative factors that evaluate its components quantitatively and qualitatively. Thus, comparing different types of MLI topologies is a simple process of comparing their calculated BM scores leading to better well-informed choice. First, the proposed BM-derived forms are discussed. Then, the proposed methodology is illustrated by applying to various types of MLI topologies including conventional and recently introduced ones.

ACS Style

Ahmed Sheir; Mohamed Orabi; Mohamed Z. Youssef; Mahrous Ahmed. Toward a Way to Benchmark Multilevel Inverter Topologies Based on Level to Components Ratio. Canadian Journal of Electrical and Computer Engineering 2019, 42, 78 -92.

AMA Style

Ahmed Sheir, Mohamed Orabi, Mohamed Z. Youssef, Mahrous Ahmed. Toward a Way to Benchmark Multilevel Inverter Topologies Based on Level to Components Ratio. Canadian Journal of Electrical and Computer Engineering. 2019; 42 (2):78-92.

Chicago/Turabian Style

Ahmed Sheir; Mohamed Orabi; Mohamed Z. Youssef; Mahrous Ahmed. 2019. "Toward a Way to Benchmark Multilevel Inverter Topologies Based on Level to Components Ratio." Canadian Journal of Electrical and Computer Engineering 42, no. 2: 78-92.

Journal article
Published: 25 May 2019 in Energies
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This paper presents a multi-input Ćuk-derived Buck-Boost voltage source inverter (CBBVSI) for Photovoltaic (PV) systems. The proposed topology consists of a single-stage DC-AC inverter that combines both DC-DC and DC-AC stages. The DC-DC stage is used for stepping-up the voltage from the PV generator. Simultaneously, the DC-AC stage is used for interfacing the PV source with the AC grid. The topology allows three sources to utilize the antiparallel diodes for each inverter leg for transferring the energy. The proposed system exhibits several features such as a reduction of the number of components compared to typical two-stage structures, and Split-Source Inverter (SSI), and Z-Source Inverter (ZSI) topologies. Moreover, the power of each PV source can be harvested either simultaneously or separately since independent Maximum Power Point Tracking (MPPT) is performed. The system was simulated using MATLAB/SIMULINK software and a 1 kW laboratory prototype was implemented to verify the operation of the proposed CBBVSI. The numerical simulations are presented together with the experimental results, showing a good agreement.

ACS Style

Eltaib Abdeen; Mahmoud A. Gaafar; Mohamed Orabi; Emad M. Ahmed; Abdelali El Aroudi. Multi-Input Ćuk-Derived Buck-Boost Voltage Source Inverter for Photovoltaic Systems in Microgrid Applications. Energies 2019, 12, 2007 .

AMA Style

Eltaib Abdeen, Mahmoud A. Gaafar, Mohamed Orabi, Emad M. Ahmed, Abdelali El Aroudi. Multi-Input Ćuk-Derived Buck-Boost Voltage Source Inverter for Photovoltaic Systems in Microgrid Applications. Energies. 2019; 12 (10):2007.

Chicago/Turabian Style

Eltaib Abdeen; Mahmoud A. Gaafar; Mohamed Orabi; Emad M. Ahmed; Abdelali El Aroudi. 2019. "Multi-Input Ćuk-Derived Buck-Boost Voltage Source Inverter for Photovoltaic Systems in Microgrid Applications." Energies 12, no. 10: 2007.

Proceedings article
Published: 01 May 2019 in 2019 IEEE International Symposium on Predictive Control of Electrical Drives and Power Electronics (PRECEDE)
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This paper presents a model predictive control (MPC) system for multi-level microinverter operated for the applications of module-based Photovoltaic (PV) configurations. A microinverter topology consists of switched capacitor (SC) networks, boost converter and single-phase inverter; all are integrated in one power stage and connected to single PV module. In this paper, a model predictive control system is introduced to reduce the steady state error of the grid-injected current and assure harvesting the maximum power from the PV module. In addition to enhance the response time during the transient condition and reduce the total harmonic distortion (THD) without using any modulation schemes. The proposed control on the multilevel microinverter topology is verified using MATLAB-Simulink and OPAL-RT LAB tools.

ACS Style

Eltaib Abdeen; Mahmoud A. Gaafar; Mohamed Orabi; Fengxiang Wang. Predictive Control of Multi-Level Single Phase Microinverter. 2019 IEEE International Symposium on Predictive Control of Electrical Drives and Power Electronics (PRECEDE) 2019, 1 -5.

AMA Style

Eltaib Abdeen, Mahmoud A. Gaafar, Mohamed Orabi, Fengxiang Wang. Predictive Control of Multi-Level Single Phase Microinverter. 2019 IEEE International Symposium on Predictive Control of Electrical Drives and Power Electronics (PRECEDE). 2019; ():1-5.

Chicago/Turabian Style

Eltaib Abdeen; Mahmoud A. Gaafar; Mohamed Orabi; Fengxiang Wang. 2019. "Predictive Control of Multi-Level Single Phase Microinverter." 2019 IEEE International Symposium on Predictive Control of Electrical Drives and Power Electronics (PRECEDE) , no. : 1-5.

Research article
Published: 29 March 2019 in IET Smart Grid
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This study presents a distributed prioritised coordinated control topology that has the capability to reduce the total generation cost and maintain the average DC microgrid voltage. The main advantage of this topology over the addressed ones is developing a prioritised normalised running cost methodology. In this methodology, the best economical combination of DGs is selected to fulfil the load demand and maintain the minimum required spinning reserve power. The developed coordinated controllers contain tertiary and secondary levels cooperating to guarantee economical load sharing between the dispatchable DGs through precise adjustment of the primary voltage levels. Simulation and experimental results verify the efficacy and feasibility of the proposed dispatch scheme compared to the conventional power-sharing techniques. In addition, system reliability enhancement during communication link failure and DG plug-n-play are investigated as well.

ACS Style

Mohamed Zaery; Emad M. Ahmed; Mohamed Orabi. Low operational cost distributed prioritised coordinated control for DC microgrids. IET Smart Grid 2019, 2, 233 -241.

AMA Style

Mohamed Zaery, Emad M. Ahmed, Mohamed Orabi. Low operational cost distributed prioritised coordinated control for DC microgrids. IET Smart Grid. 2019; 2 (2):233-241.

Chicago/Turabian Style

Mohamed Zaery; Emad M. Ahmed; Mohamed Orabi. 2019. "Low operational cost distributed prioritised coordinated control for DC microgrids." IET Smart Grid 2, no. 2: 233-241.

Conference paper
Published: 01 March 2019 in 2019 IEEE Applied Power Electronics Conference and Exposition (APEC)
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This paper presents a new integrated auxiliary bidirectional multilevel converter for applications in electric vehicle (EV). This converter is modular and is designed to be used to power communication circuits, WI-FI and heating, ventilation, and air conditioning (HVAC). It still requires bi-directional operation to flexibly interchange power from and to the auxiliary system battery. The vicinity of the proposed converter to sensitive loads is certified against the European Norm and North American electromagnetic compatibility (EMC) standards. The new configuration allows replacing the bulky electrolytic capacitors with film capacitors that has longer life, higher reliability, lighter weight and smaller size. EMC preliminary results are given in this paper to show compliance with the certification standard limits. Validation of the proposed configuration was conducted using a Simulink model, PSIM simulation model, and a real- time 750Vdc-3 kW laboratory prototype. The proposed converter shows emission interference as well as design immunity to the neighboring power system onboard the electric vehicle.

ACS Style

Ahmed Sheir; Mohamed Z. Youssef; Mohamed Orabi. A Novel Auxiliary Modular Inverter with Battery Integration for Electric Vehicle Applications. 2019 IEEE Applied Power Electronics Conference and Exposition (APEC) 2019, 1730 -1737.

AMA Style

Ahmed Sheir, Mohamed Z. Youssef, Mohamed Orabi. A Novel Auxiliary Modular Inverter with Battery Integration for Electric Vehicle Applications. 2019 IEEE Applied Power Electronics Conference and Exposition (APEC). 2019; ():1730-1737.

Chicago/Turabian Style

Ahmed Sheir; Mohamed Z. Youssef; Mohamed Orabi. 2019. "A Novel Auxiliary Modular Inverter with Battery Integration for Electric Vehicle Applications." 2019 IEEE Applied Power Electronics Conference and Exposition (APEC) , no. : 1730-1737.

Conference paper
Published: 01 March 2019 in 2019 IEEE Applied Power Electronics Conference and Exposition (APEC)
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This paper proposes a transformer-less high gain multi-level single phase micro-inverter. The proposed topology integrates full-bridge inverter into DC link consists of switched capacitors network. By a proper connection of the DC link capacitors, the output voltage levels can be generated. A proper modulation and control algorithms have been developed for the proposed topology. Compared to other micro-inverters, the proposed one offers much higher gain along with multi-level shaping of the output voltage. The operating modes of the proposed topology are illustrated. The voltage stress of all components is identified. Simulation and experimental validation for the proper operation of the 7-level version of the proposed topology are carried out.

ACS Style

Eltaib Abdeen; Mahmoud A. Gaafar; Mohamed Orabi; Mohamed Youssef. A Novel High Gain Single-phase Transformer-less Multi-level Micro-inverter. 2019 IEEE Applied Power Electronics Conference and Exposition (APEC) 2019, 3263 -3268.

AMA Style

Eltaib Abdeen, Mahmoud A. Gaafar, Mohamed Orabi, Mohamed Youssef. A Novel High Gain Single-phase Transformer-less Multi-level Micro-inverter. 2019 IEEE Applied Power Electronics Conference and Exposition (APEC). 2019; ():3263-3268.

Chicago/Turabian Style

Eltaib Abdeen; Mahmoud A. Gaafar; Mohamed Orabi; Mohamed Youssef. 2019. "A Novel High Gain Single-phase Transformer-less Multi-level Micro-inverter." 2019 IEEE Applied Power Electronics Conference and Exposition (APEC) , no. : 3263-3268.

Conference paper
Published: 01 March 2019 in 2019 IEEE Applied Power Electronics Conference and Exposition (APEC)
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Usually, power converters are used to deliver renewable energy to the grid. The operation of these converters greatly impacts the power quality and reliability of the power system. Hence, more attention should be paid to the performance of such power electronic systems. Being one of these converters, current source inverter (CSI) operation is influenced by the overlap period (OLP) that is included in its pulse-train to prevent voltage spikes. The OLP results in waveform distortions and vector deviation error. This study proposes an overlap technique and optimizes the modulation sequence that reduced the effect of OLP remarkably. The ampere-second analysis of the dwell times of the modulation vectors is provided, the resulted error expressions are derived. Hardware prototype is being implemented in the lab and a sample of the results are provided.

ACS Style

Mahmoud Gaber; Omar Abdel-Rahim; Mohamed Orabi. Optimization of the Modulation Sequence and Proposing an Overlap Technique for Current Source Inverter. 2019 IEEE Applied Power Electronics Conference and Exposition (APEC) 2019, 2475 -2480.

AMA Style

Mahmoud Gaber, Omar Abdel-Rahim, Mohamed Orabi. Optimization of the Modulation Sequence and Proposing an Overlap Technique for Current Source Inverter. 2019 IEEE Applied Power Electronics Conference and Exposition (APEC). 2019; ():2475-2480.

Chicago/Turabian Style

Mahmoud Gaber; Omar Abdel-Rahim; Mohamed Orabi. 2019. "Optimization of the Modulation Sequence and Proposing an Overlap Technique for Current Source Inverter." 2019 IEEE Applied Power Electronics Conference and Exposition (APEC) , no. : 2475-2480.

Conference paper
Published: 01 February 2019 in 2019 International Conference on Innovative Trends in Computer Engineering (ITCE)
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This paper introduces two contributions. the first is the development of switched inductor quadratic boost converter (SIQBC) with a very high gain at low duty cycle for photovoltaic (PV) application which can reach experimentally above. A model for the SIQBC was enforced on the laboratory. The second contribution is that the development of an efficient and quick tracking maximum power point tracking (MPPT) strategy based on the one cycle control (OCC). The planned algorithmic program attains the Maximum power point (MPP), once scanning and tracking the I-V curve during a comparatively short time, with little oscillation in steady state. the change in the radiation level causes the proposed MPPT to be resetting and repeating the tracking. even in the case of fast environmental conditions variation this algorithm can track the maximum power in a comparatively short time.

ACS Style

Khalid Awad; Omar Abdel-Rahim; Mohamed Orabi. Modified Maximum Power Point Tracking Technique Based on One Cycle Control for PV Applications. 2019 International Conference on Innovative Trends in Computer Engineering (ITCE) 2019, 396 -400.

AMA Style

Khalid Awad, Omar Abdel-Rahim, Mohamed Orabi. Modified Maximum Power Point Tracking Technique Based on One Cycle Control for PV Applications. 2019 International Conference on Innovative Trends in Computer Engineering (ITCE). 2019; ():396-400.

Chicago/Turabian Style

Khalid Awad; Omar Abdel-Rahim; Mohamed Orabi. 2019. "Modified Maximum Power Point Tracking Technique Based on One Cycle Control for PV Applications." 2019 International Conference on Innovative Trends in Computer Engineering (ITCE) , no. : 396-400.