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Altagamoa Al Khames, Main centre of town, end of 90th Street
New Cairo
Egypt
Faculty of Engineering & Technology

Naser Mohammed Bayoumy AbdelRahim

Basic information

Name : Naser Mohammed Bayoumy AbdelRahim
Title: professor

Education

Certificate Major University Year
PhD . Memorial University of Newfoundland,St.John's Newfoundland,Canada 1995

Researches /Publications

DVR Control System for Voltage SagSwell Compensation for Sensitive Loads Protection - 01/0

Naser Mohammed Bayoumy AbdelRahim

Zeinab Elkady , Ahmed Aly Mansour , Fahmy M. Bendary

01/09/2020

This paper introduces an enhanced control system to improve the transient response of the dynamic voltage restorer (DVR). The control strategy achieves superior response against voltage disturbance approximately within 400 µs. The control system comprises three terms: closed-loop feedback control signal, upstream disturbance detection error, and voltage drop over DVR term. The actual load voltage is compared with its reference value and is adapted by a PI controller. The upstream disturbance detection significantly enhances the transient time of the control system performance and improves its steady-state operation. In addition, the voltage drop over the DVR term represents the voltage drop caused by the DVR circuit component. Incorporating these effects in the control loop, fast and accurate response of the system are achieved. An L filter is used instead of the LC filter to overcome the inherent LC filter damping delay and resonance problem mentioned in previous studies. The system is simulated using MATLAB/ Simulink. The simulation results show excellent response in transient and steady-state operation for various operating conditions.

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Enhanced DVR Control System Based on the Harris Hawks Optimization Algorithm - 01/0

Naser Mohammed Bayoumy AbdelRahim

Zeinab Elkady; Ahmed A. Mansour; Fahmy M. Bendary

01/09/2020

The dynamic voltage restorer's (DVR) transient, steady-state, and dynamic responses are essential requirements for protecting sensitive loads against upstream voltage disturbances via the DVR's ride-through capabilities. DVRs also look after transient oscillation at the instant of entering, and /or exiting by the DVR. This paper presents an enhanced, optimized, and less complex DVR control system structure, which is capable of improving the transient, steady-state, and dynamic responses as well as eliminating inherent transient oscillations. The control system comprises a closed-loop feedback control signal and feedforward upstream disturbance detection signal. Incorporating the feedforward term helps, dramatically, in improving the system response and eliminating the transient oscillations in the load voltage. The error signals are adapted using a PI controller to make the load voltage faithfully track its predefined reference waveform. The controller is implemented in the dq synchronous rotating reference frame. The parameters of the PI controller are selected using modern population-based optimization called the Harris Hawks Optimization (HHO) technique. The results obtained using the HHO technique are compared with two other optimization algorithms, namely Particle Swarm Optimization (PSO) and Whale Optimization Algorithm (WOA). The results show that the HHO gives the best system response. The system is simulated using MATLAB/Simulink and the validation via Typhoon HIL402 real-time emulator. Both HIL402 validation and simulation results show that the proposed control scheme recovers normal operation against voltage disturbance within approximately 1.2 milliseconds without overshoot with steady-state error near zero and significantly dampens the inherent voltage oscillation that occurs at the instant of DVR entrance and/or exit.

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Two-Step Finite-Control Set Model Predictive Control for Three Phase UPS Inverters Feeding Non-linear Loads - 01/1

Naser Mohammed Bayoumy AbdelRahim

Y. Elthokaby

01/11/2019

A two-step prediction horizon finite-control set model predictive control scheme is proposed for three phase UPS inverters. Within the control scheme, a constraint is implemented to limit the maximum inverter inrush current, in case of non-linear loads, to an acceptable value. Simulation results show that the proposed control scheme has been successful in limiting the inrush current and producing a load voltage with very low THD with small filter size.

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Photovoltaic-Based Interconnected-Modified DC-Nanogrids within an Open Energy Distribution System - 01/1

Naser Mohammed Bayoumy AbdelRahim

E. A. Ebrahim, N. A. Maged, F. Bendary

01/11/2019

A DC nano-grid is typically intended as a reliable scheme capable of delivering power to the local loads from distributed renewable energy resources. The conventional nano-grid uses two-separate conversion stages for feeding both ac and dc loads. But, the modified design for the dc nano-grid uses only a single-stage converter. It is based on a single-input power-electronic multi-output converter that interfaces the source with the average load requirements. It deals with a switched boost inverter (SBI) that can fed from a solar photovoltaic (PV) renewable energy source. SBI is a single-stage power converter capable of simultaneously supplying both dc and a higher or lower ac loads from a single dc input voltage source. The converter operation is also contributed by a simple model reference adaptive closed loop control technique, to fed the high output ratings steadily, especially in the critical range for its duty ratio. In addition, this paper presents a full model design for multiple interconnected nanogrids through a dc-link within a multilevel direct current (dc) scheme called an open energy distributed system (OEDS). Each nanogrid involves a switched boost inverter (SBI) providing its closed-loop control method for its dc-link voltage. Moreover, this paper involves a controller method to attain the optimum power flow with high reliability for the suggested interconnected nanogrids. The proposed systems are modelled and simulated with the help of MATLAB/Simulink software package to assess the robustness of the proposed OEDS with multiple 5-Kw interconnected nanogrids fed from photovoltaic (PV) renewable energy resources.

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Analysis, Design, and Control of a Non-isolated Boost Three-Port Converter for PV Applications - 01/1

Naser Mohammed Bayoumy AbdelRahim

S. Abdelrahman, M. Selmy, K. M. Hasaneen

01/10/2019

This paper presents the modeling, analysis, design, and control of non-isolated boost three-port converter (TPC). In contrast to conventional converters that suffer from low efficiency as a result of multiple power stage conversions, the single-inductor TPC studied here has only single stage conversion between any two of the converter three ports. However, the TPC dynamic analysis are complicated due to the different energy management modes of operation. In this paper the non-isolated DC-DC boost TPC is studied in details. The converter components design and dynamic modeling are presented. Also, the converter switched, averaged, and small signal dynamic model are derived. In addition, the converter controller design for output voltage regulation and input PV maximum power point traking are presented. The system is simulated using Matlab/Simulink and the obtained results show good performance for different converter modes of operation.

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DC-Based Interconnected-Modified Nanogrids Within an Open Energy Distributed System (OEDS) - 01/0

Naser Mohammed Bayoumy AbdelRahim

N. Maged, E. Ali, and F. Bendary

01/06/2019

This paper introduces a design for several modified interconnected nanogrids via a dc-link within a multilevel direct current (DC) system that called an open energy distributed system (OEDS). Each nanogrid includes a SBI with a contribution towards improving its performance by offering a new model-reference closed-loop control technique for its dc-link voltage. Also, this paper includes a controller technique for the proposed interconnected nanogrids to achieve the optimum power flow with high reliability. The proposed systems are modelled and simulated with the help of MATLAB/Simulink software package. The included test results ensure the system robustness against the load fluctuations and its validity to be applied on various power loads in remote areas.

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PV-Based Dynamic Voltage Restorer for Power Quality Enhancement in Distribution Systems - 01/0

Naser Mohammed Bayoumy AbdelRahim

Z. Elkady, A. Mansour, M. Elhagry, and F. Bendary

01/06/2019

PV-based dynamic voltage restorer (DVR) is considered one of the most effective solutions for enhancing the functionality of the PV grid system by adding ancillary functions to the grid side inverter. DVR protects against voltage sag and swell based on pulse width-modulated (PWM) voltage source inverters. This paper investigates the performance and analysis of three phase DVR based on synchronous reference frame (SRF) theory. The control algorithm has been developed for the generation of compensating reference voltage vector to inject or absorb active and reactive power in series between the point of common coupling and critical load. The results presented in the paper show that the proposed control algorithm has excellent performance in both steady-state and dynamic phases.

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PV Based Dynamic Voltage Restorer for Power Quality Enhancement in Distribution System - 01/0

Naser Mohammed Bayoumy AbdelRahim

Z. Elqady, A. Mansour, M. Elhagry, and F. Bendarym

01/06/2019

PV-based dynamic voltage restorer (DVR) is considered one of the most effective solutions for enhancing the functionality of the PV grid system by adding ancillary functions to the grid side inverter. DVR protects against voltage sag and swell based on pulse width-modulated (PWM) voltage source inverters. This paper investigates the performance and analysis of three phase DVR based on synchronous reference frame (SRF) theory. The control algorithm has been developed for the generation of compensating reference voltage vector to inject or absorb active and reactive power in series between the point of common coupling and critical load. The results presented in the paper show that the proposed control algorithm has excellent performance in both steady-state and dynamic phases.

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DC-Based Interconnected-Modified Nanogrids within an Open Energy Distributed System (OEDS) - 01/0

Naser Mohammed Bayoumy AbdelRahim

N. Maged, E. Ebrahim, and F. Bendary

01/06/2019

This paper introduces a design for several modified interconnected nanogrids via a dc-link within a multilevel direct current (DC) system that called an open energy distributed system (OEDS). Each nanogrid includes a SBI with a contribution towards improving its performance by offering a new model-reference closed-loop control technique for its dc-link voltage. Also, this paper includes a controller technique for the proposed interconnected nanogrids to achieve the optimum power flow with high reliability. The proposed systems are modelled and simulated with the help of MATLAB/Simulink software package. The included test results ensure the system robustness against the load fluctuations and its validity to be applied on various power loads in remote areas.

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A Novel Approach of a Single Input Multi Output Switched Boost Inverter - 01/0

Naser Mohammed Bayoumy AbdelRahim

E. A. Ebrahim, N. A. Maged

01/02/2018

A DC nano-grid is typically designed as a reliable system that can supply power from the distributed renewable energy sources to the local loads. Traditional nano-grid employs two-stage ac-dc power converter/inverter sets to feed both ac and dc loads respectively. But, modified nano-grid utilizes only one single-stage converter. This system is based on a power-electronic single-input multi-output converter which interfaces the source with the average load demands. This paper deals with a switched boost inverter (SBI) applicable for solar photovoltaic system (PV) as its renewable energy source. SBI is a single-stage power converter that can supply both dc and ac loads simultaneously from a single dc input voltage source. The SBI can also produce an ac output voltage either greater or lower than its dc input voltage. This converter exhibits better Electro Magnetic Interference (EMI) noise immunity as compared to the two stage-power converter. Also, this converter operation allows shoot-through of the inverter legs without damage to its IGBT-switches. So, this paper discusses the advantages, structure, steady-state analysis, and PWM control technique for the SBI especially, when produces a high-rating dc-output voltage from a very-low input-voltage of a PV-solar array to establish its verification. Matlab/Simulink-based simulation is performed for several cases of operations-with PV-mathematical model-to test the robustness of this converter against the supply fluctuations. Also, the harmonic spectrum analysis for the load current is also computed and plotted for a 5-Kw proposed nanogrid.

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Finite-Control Set Model-Predictive Control for Single-Phase Voltage-Source UPS Inverters - 01/1

Naser Mohammed Bayoumy AbdelRahim

Y. Elthokaby ; A. L. Elshafei ; Emad S. Abdel-Aliem

01/12/2016

Uninterruptable power supply (UPS) applications require a well regulated sinusoidal output voltage with low total harmonic distortion (THD). These requirements are achieved by model predictive control (MPC) of UPS inverter with LC filter on the output. The controller uses the model of the system to predict the future behavior of the controlled variables for all possible voltage vectors, and uses the information to obtain optimal action by choosing the voltage vector which minimizes a cost function. A Matlab/Simulink model is used to obtain simulation results to show that the performance of the proposed control system can achieve a sinusoidal load voltage with low THD.

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New Topology of Multiple-input Single- output PV System for DC Load Applications - 01/1

Naser Mohammed Bayoumy AbdelRahim

Z. Elkady, M. M. Elhagry, and F. Bendary

01/12/2016

Improving PV system structure and maximizing the output power of a PV system has drawn many researchers attention nowadays. A proposed multi-input single-output PV system is proposed in this paper. The system consists of multiple PV modules; each module feeds a DC–DC converter. The outputs of the converters are tied together to form a DC voltage source. In order to minimize the output ripples of the converters, the control signal of each converter is time shifted from each other by a certain time interval depending on the number of converters used in the topology. In this study a battery is used as the main load, the load current used as the control variable. A fuzzy logic controller designed to modulate the operating point of the system to get the maximum power. The results show that the proposed system has very good response for various operating conditions of the PV system. In addition the output filter is minimized with excellent quality of the DC output voltage.

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Voltage and Frequency Control of Stand-Alone Doubly-Fed Induction Generator used in WECS - 01/1

Naser Mohammed Bayoumy AbdelRahim

M. Shaarawee, and A. Shaltout,

01/12/2015

Stand-alone Wind Energy Conversion Systems employing self-excited induction generators usually suffer from variable output voltage frequency and magnitude as the wind speed varies. In this paper, the doubly-fed induction generators (DFIGs) are used instead to overcome this problem. This is achieved by controlling the rotor input/output power of the DFIG during the whole range of wind turbine speed. At first, the wind turbine model is presented along with the dynamic model of the stand-alone DFIG. Indirect vector control algorithm is applied to control the rotor currents magnitude and frequency. The simulation results show that the proposed control scheme is able to maintain both constant output voltage magnitude and frequency irrespective of the wind speed variations. Index Terms –Wind turbine model, Doubly-fed induction generator, d-q Modelling, indirect vectorcontrol .

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Improving the efficiency of a Doubly-Fed Induction Generator in variable speed wind turbines under different modes of operation considering core loss - 01/0

Naser Mohammed Bayoumy AbdelRahim

Ahmed S. Helmy ; Adel Shaltout ; Naser Abdel-Rahim

01/08/2015

This paper investigates improving the efficiency and the performance of Wind Energy Conversion Systems (WECS) equipped with Doubly Fed Induction Generator (DFIG). The main objective is to maximize the output power while minimizing the total copper loss simultaneously. This can be achieved using an analytical approach to determine the proper rotor current commands which give maximum mechanical power and minimum loss based on the measured generator speed. A hardware setup was constructed for validation of simulation results of maximum power point tracking and for further investigation of the change in the wind speed on the ability of the control system to respond to these changes with the proper control commands to obtain the maximum output power of the DFIG.

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DC-bus Voltage Regulation of a Wind Energy Conversion System via an Adaptive Critic Design - 01/0

Naser Mohammed Bayoumy AbdelRahim

M. Azzouz, N. Abdel-Rahim, and A. L. Elshafei

01/05/2014

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Control methods of the switched reluctance motor in electric vehicle during acceleration - 01/1

Naser Mohammed Bayoumy AbdelRahim

F. Abdel-Kader, M. Elsherif, and M. Fathy

01/11/2012

In this paper, the equations describing the performance of the electric vehicle are derived. Performance characteristics for each part in the vehicle system are obtained when the vehicle is accelerated under voltage, turn on, and turn off angle control. A comparison between the different methods of control is established. From these comparisons, it can be noticed that the acceleration time, for the case at which the turn on angle is controlled, will be smaller than that for the other cases; also the motor efficiency, at the voltage control method, has the highest value especially at the higher values of the vehicle speed.

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Torsional Vibration Control of Large Induction Motors Using Constant Air Gap Flux Scheme - 01/0

Naser Mohammed Bayoumy AbdelRahim

A. Shaltout

01/09/2012

Comprehensive analysis of the starting period of inverter-fed large induction motors reveals that these motors are subjected to additional components of pulsating torsional torque. These torque pulsations may coincide with the natural torsional frequency of the large motor system and produce hazardous shaft torque oscillations. To alleviate the torsional toque problem and limit the motor starting current, a constant air-gap flux using slip frequency control scheme is proposed to operate the motor inverter. Simulation results show that the proposed scheme is capable of drastically reducing the torsional torque oscillations and limiting the motor line current to approximately 22% of its direct online starting value without prolonging its starting period.

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Performance Characteristics of the Switched Reluctance Motor in Electric Vehicle during Acceleration at Variable Turn on and Turn off Angle - 01/0

Naser Mohammed Bayoumy AbdelRahim

F. Abdel-Kader, M. Elsherif, M. Fathy

01/03/2012

In this paper, the equations describing the performance of the electric vehicle are derived. Performance characteristics for each part in the vehicle system are obtained when the vehicle is accelerated under a variable terminal voltage while the turn on, turn off angles are constants.

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Adjustable-Speed Unsymmetrical Two-Phase Induction Motor Drive for Photovoltaic Powered Air Conditioners - 01/0

Naser Mohammed Bayoumy AbdelRahim

N. Abdel-Rahim

01/08/2010

This article proposes a novel application of adjustable-speed one-phase induction motors in air conditioners powered by photovoltaic arrays. Employing the slip-frequency control scheme, an off-the-shelf one-phase induction motor is operated as an unsymmetrical two-phase induction motor. Maintaining certain control conditions, the unsymmetrical two-phase induction motor is made to behave like a symmetrical two-phase induction motor. This has the advantage of increasing the motor efficiency and reducing the torque pulsations inherent to unsymmetrical two-phase induction motors. The proposed control scheme reduces both initial and running costs of the proposed photovoltaic system. Initial cost is cut down by reducing the required size of the photovoltaic array through (i) limiting the motor current during both transient and dynamic phases of operation, (ii) extracting maximum power from the photovoltaic array under various climate conditions by operating the photovoltaic array on the maximum power line, and (iii) dispensing with the need for specially designed two-phase induction motors. Reduction in the running cost of the photovoltaic system is achieved by enhancing the motor efficiency through eliminating the backward component of the air gap flux. The article outlines a procedure for sizing the photovoltaic arrays. Simulation results of the system behavior during transient and dynamic phases confirm the capability of the proposed scheme.

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Simple Controller for Boost Converter for Fuel Cell Applications - 01/1

Naser Mohammed Bayoumy AbdelRahim

M. S. S. Taha, O. A. Mahgoub

01/12/2009

Fuel cells have become one of the most promising sources of electrical energy because of their high efficiency, low environmental impact, and modularity. However, there are some difficulties in their operation such as the inability to accept current in the reverse direction, having low output voltage that varies with age and current drawn from it, responding sluggishly to step changes in load, and limitations in overload capabilities. For these reasons, boost types DC-DC converters are often necessary to boost and regulate their voltage to provide an applicable DC power source. Although sliding mode controllers are used for these types of converters because of their robustness and stability, yet such controllers operate at very large and variable switching frequency. This introduces excessive switching losses, filter design complication, and electromagnetic interference noise. The proposed controller is a classical PI controller cascaded with phase-lead compensator. The system is analyzed and the proposed controller is designed. An experimental setup is constructed in the laboratory to verify the performance of the proposed controller. It is shown that the proposed controller is simple to implement, has good performance measures such as small settling time, slight overshoot, and very low steady-state error.

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An Unsymmetrical Two-Phase Induction Motor Drive With Slip-Frequency Control - 01/0

Naser Mohammed Bayoumy AbdelRahim

A. Shaltout

01/09/2009

This paper proposes a closed-loop control strategy to operate an off-the-shelf single-phase induction motor (IM) as a symmetrical two-phase IM. The proposed control strategy employs the SFC technique to independently control the stator currents of both the main and auxiliary windings, and make them follow a predefined sinusoidal waveform. Simulation and experimental results show that the proposed scheme is successful in operating the conventional single-phase IM as a symmetrical two-phase IM with fast dynamic and transient responses. In addition, the proposed control system achieves cost-effectiveness in both initial and running costs.

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Analysis and Design of Photovoltaic Powered Air Conditioners Using Slip-Frequency Control Scheme - 01/0

Naser Mohammed Bayoumy AbdelRahim

A. Shaltout

01/01/2007

This article proposes a new scheme to drive an air conditioner powered by photovoltaic (PV) arrays. The main objective is to reduce the cost of the system, which is a major concern in PV applications. This is achieved by reducing both the initial and running costs of the PV system. Initial cost is cut down by reducing the required size of the PV array through (i) limiting the motor current during both startup and dynamic phases of operation, and (ii) extracting maximum power from the PV array under various metrological conditions by operating the PV array on the maximum power line. Reduction in the running cost of the PV system is achieved by controlling the motor speed such that its slip is kept at a small value at various operating conditions, ensuring highly efficient operation of the system. This article outlines a procedure for sizing the photovoltaic array. Also, the article presents a control strategy that achieves acceptable levels of the motor current with good dynamic response. Simulation results of the system behavior during transient and dynamic phases confirm the capability of the proposed scheme.

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Cost-Effective Control Scheme for Reduction of Torsional Torque Oscillations in Starting Large Induction Motors - 01/0

Naser Mohammed Bayoumy AbdelRahim

A. Shaltout

01/09/2006

This article presents a cost-effective variable frequency drive for starting and operating large three-phase squirrel cage induction motors. The proposed drive employs the constant V/F control scheme, which regulates the rotor frequency such that it is always kept below a predetermined value. This has the effect of drastically reducing the motor shaft torque oscillations and significantly limiting the maximum value of the motor line current. In addition to its simplicity and hence cost-effectiveness, the proposed scheme is shown to be capable of (i) reducing the shaft torque oscillations to approximately 22% of that of the direct on-line start of the large motor, and (ii) limiting the motor line current to approximately 36% of that of the direct on-line start value.

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