Search results for: Ahmed M. Azmy

Items from 1 to 20 out of 22 results

article

Placenta Accreta Spectrum (PAS) disorders: incidence, risk factors and outcomes of different management strategies in a tertiary referral hospital in Minia, Egypt: a prospective study

Saad Gelany, Mohammed H. Mosbeh, Emad M. Ibrahim, Mo’men Mohammed, more

BMC Pregnancy and Childbirth > 2019 > 19 > 1 > 1-8

Background Placenta accreta spectrum (PAS) disorders have become a significant life-threatening issue due to its increased incidence, morbidity and mortality. Several studies have tried to identify the risk factors for PAS disorders. The ideal management for PAS disorders is a matter of debate. The study objectives were to evaluate the incidence and risk factors of PAS disorders and to compare different...

article

Adaptive differential evolution algorithm for efficient reactive power management

Walaa S. Sakr, Ragab A. EL-Sehiemy, Ahmed M. Azmy

Applied Soft Computing > 2017 > 53 > C > 336-351

This paper introduces a proposed procedure to solve the optimal reactive power management (ORPM) problem based on a multi-objective function using a modified differential evolution algorithm (MDEA). The proposed MDEA is investigated in order to enhance the voltage profile as well as to reduce the active power losses by solving the ORPM problem. The ORPM objective function aims to minimize transmission...

chapter

Defining optimal DG penetration for minimizing energy losses concerning repairing fault periods

Abd-ElFattah Hamad, Ayman Hoballah, Ahmed M. Azmy

2016 Eighteenth International Middle East Power Systems Conference (MEPCON) > 585 - 590

2016 Eighteenth International Middle East Power Systems Conference (MEPCON)

The rapid increase of distributed generations (DGs) has many benefits for distribution systems and could result in some negative effects. Identifying the optimum locations and sizes for these units increases the benefits and limits the negative effects. Many researches tried to define the optimal DG siting and sizing. Either normal operation or faulty conditions have been considered in this process...

chapter

Optimal automation level for reliability improvement and self-healing MV distribution networks

M. R. Elkadeem, M. A. Alaam, Ahmed M. Azmy

2016 Eighteenth International Middle East Power Systems Conference (MEPCON) > 206 - 213

2016 Eighteenth International Middle East Power Systems Conference (MEPCON)

Smart secondary substations (S/S) play a vital role in advanced Distribution automation system (ADAS) in order to achieve self-healing grid and improve the reliability level of medium voltage (MV) distribution networks. However, the main challenges with ADAS is the determination of the optimal automation level. This is a non-linear discrete optimization problem with multi-dimensions. Thus, it is not...

article

Optimal allocation of TCSCs by adaptive DE algorithm

Walla S. Sakr, Ragab A. El-Sehiemy, Ahmed M. Azmy

IET Generation, Transmission & Distribution > 2016 > 10 > 15 > 3844 - 3854

This study presents an adaptive differential evolution (DE) algorithm to allocate the thyristor-controlled series compensator (TCSC) incorporated with the reactive power management problem. In addition, a dynamic updating is applied for scaling and penalty factors to enhance the performance of the multi-objective DE algorithm. During the selection of the best candidate lines for efficient allocation...

chapter

Dynamic pricing for demand-side management within smart grid environment

A. Abaza, Ahmed M. Azmy

2016 IEEE International Conference on Power and Energy (PECon) > 680 - 685

2016 IEEE International Conference on Power and Energy (PECon)

This paper proposes an innovative developed framework to implement and evaluate an effective dynamic pricing (dP) methodology for demand-side management (DSM) within smart grid (SG) environment. The proposed framework is realized through two phases. In the first phase, a generic set of formulas is developed based on a composite particle swarm-heuristic optimization technique to enable informing consumers...

article

Operation optimization of distributed generation using artificial intelligent techniques

Mahmoud H. Elkazaz, Ayman A. Hoballah, Ahmed M. Azmy

Ain Shams Engineering Journal > 2016 > 7 > 2 > 855-866

Future smart grids will require an observable, controllable and flexible network architecture for reliable and efficient energy delivery. The use of artificial intelligence and advanced communication technologies is essential in building a fully automated system. This paper introduces a new technique for online optimal operation of distributed generation (DG) resources, i.e. a hybrid fuel cell (FC)...

article

Defining the practical constraints of inserting DG units in distribution systems regarding protection schemes

Hossam A. Abdel‐Ghany, Ahmed M. Azmy

European Transactions on Electrical Power > 25 > 12 > 3618 - 3629

This paper presents a general framework to determine the location and capacity limits of distributed generation (DG) in the distribution system (DS) in order to maintain the traditional protection scheme. The impacts of DG penetration on overcurrent protection coordination are analyzed including fuse–recloser and recloser–relay. The minimum boundary of DG penetration in distribution system and the...

chapter

Controller performance of variable speed wind driven doubly-fed induction generator

Ali H. Kasem Alaboudy, Ahmed M. Azmy, Walid S.E. Abdellatif

2015 Saudi Arabia Smart Grid (SASG) > 1 - 6

2015 Saudi Arabia Smart Grid (SASG)

With the advancements in the variable speed system design and control of wind energy systems, the power capturing capability and controller complexity of these systems are increasing in parallel. Doubly fed induction generators (DFIGs) with a partial-scale size back-to-back converter set are among the promising technologies in wind power generation schemes. This paper discusses the controller performance...

chapter

Dielectric properties of aged mineral oil filled with TiO2 nanoparticles

Manal M. Emara, Diaa-Eldin A. Mansour, Ahmed M. Azmy

2015 4th International Conference on Electric Power and Energy Conversion Systems (EPECS) > 1 - 5

2015 4th International Conference on Electric Power and Energy Conversion Systems (EPECS)

When mineral oil is exposed to aging processes during their operation, oil properties significantly deteriorate. This necessitates reclamation of the oil or replacement with a new one. Both solutions are not preferred due to their high cost. From this viewpoint, this study aims to enhance aged oil properties by using nanofillers to be suitable for reusing in power transformers. Accelerated aging test...

chapter

Optimizing distributed generation operation for residential application based on automated systems

Mahmoud H. Elkazaz, Ayman Hoballah, Ahmed M. Azmy

2015 4th International Conference on Electric Power and Energy Conversion Systems (EPECS) > 1 - 6

2015 4th International Conference on Electric Power and Energy Conversion Systems (EPECS)

article

Optimizing DG penetration in distribution networks concerning protection schemes and technical impact

Hossam A. Abdel-Ghany, Ahmed M. Azmy, Nagy I. Elkalashy, Essam M. Rashad

Electric Power Systems Research > 2015 > 128 > Complete > 113-122

Distributed generators (DGs) provide many benefits for distribution networks, however they increase the fault current level and cause miscoordination between the protective devices. This paper presents a framework to determine the optimal locations and permissible capacity limits of inserting DGs in the distribution system using the genetic algorithm (GA). A multi-objective function is developed based...

article

Dispersion behavior and breakdown strength of transformer oil filled with TiO₂ nanoparticles

Eman G. Atiya, Diaa-Eldin A. Mansour, Reham M. Khattab, Ahmed M. Azmy

IEEE Transactions on Dielectrics and Electrical Insulation > 2015 > 22 > 5 > 2463 - 2472

Recently, the study of transformer oil-based nanofluids became of great interest, due to their prospective properties as a dielectric and cooling medium. However, agglomeration of nanoparticles limits the beneficial properties that can be obtained from nanofluids. So, the work presented in this paper aims to get enhanced dispersion behavior of nanoparticles within transformer oil-based nanofluids...

article

Effect of process parameters on the dynamic behavior of polymer electrolyte membrane fuel cells for electric vehicle applications

A.A. Abd El Monem, Ahmed M. Azmy, S.A. Mahmoud

Ain Shams Engineering Journal > 2014 > 5 > 1 > 75-84

This paper presents a dynamic mathematical model for Polymer Electrolyte Membrane “PEM” fuel cell systems to be used for electric vehicle applications. The performance of the fuel cell, depending on the developed model and taking the double layer charging effect into account, is investigated with different process parameters to evaluate their effect on the unit behavior. Thus, it will be easy to develop...

chapter

Impedance-based fault location technique for distribution systems in presence of distributed generation

F. M. Abo-Shady, M. A. Alaam, Ahmed M. Azmy

2013 IEEE International Conference on Smart Energy Grid Engineering (SEGE) > 1 - 6

2013 IEEE International Conference on Smart Energy Grid Engineering (SEGE)

This paper presents an analytical technique for fault location in distribution systems in presence of distributed generation (DG). The presence of DG changes the nature of power flow from unidirectional to multidirectional. Therefore, the accuracy of impedance-based fault location methods will be affected by the presence of DG. The proposed technique is a modification of impedance-based methods to...

chapter

Demand-side management-based dynamic pricing within smart grid environment

A. Abaza, Ahmed M. Azmy

2013 IEEE International Conference on Smart Energy Grid Engineering (SEGE) > 1 - 6

2013 IEEE International Conference on Smart Energy Grid Engineering (SEGE)

In future smart grids, two-way communications will enable consumers to make informed decision about their energy consumption. Dynamic pricing can inspire customers to reshape their consumption, such that they consume energy efficiently and wisely. This paper introduces an advanced and simple method to achieve demand side management (DSM)-based dynamic pricing (DP) technique. The proposed technique...

chapter

Performance analysis of polymer electrolyte membrane fuel cells for electric vehicle applications

A. A. Abd El-Monem, Ahmed M. Azmy, S. A. Mahmoud

2013 IEEE Grenoble Conference > 1 - 6

2013 IEEE Grenoble PowerTech

This paper presents a dynamic simulation of a Fuel Cell Electric Vehicle “FCEV” system with regenerative braking, based on a separately excited DC electric motor. A description of the model, with the associated developed controllers, for the fuel cell and the vehicle system is also introduced. The dynamic model of the Polymer Electrolyte Membrane Fuel Cell “PEMFC” and the selected controller parameters...

article

Improving Fault Ride-Through Capability of DFIG-Based Wind Turbine Using Superconducting Fault Current Limiter

Mariam E. Elshiekh, Diaa-Eldin A. Mansour, Ahmed M. Azmy

IEEE Transactions on Applied Superconductivity > 2013 > 23 > 3-2 > 5601204

With increased penetration of wind energy as a renewable energy source, there is a need to keep wind turbines connected to the grid during different disturbances such as grid faults. In this paper, the use of superconducting fault current limiter (SFCL) is proposed to reduce fault current level at the stator side and improve the fault ride-through (FRT) capability of the system. To highlight the proposed...

chapter

Effect of titania nanoparticles on the dielectric properties of transformer oil-based nanofluids

Diaa-Eldin A. Mansour, Eman G. Atiya, Reham M. Khattab, Ahmed M. Azmy

2012 Annual Report Conference on Electrical Insulation and Dielectric Phenomena > 295 - 298

2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP 2012)

In this paper, a study on the dielectric properties of transformer oil-based nanofluids is presented. Titanium oxide nano ceramic particles, known as titania nanofillers, was used in the investigation process. The nanofluid samples were prepared using two-step method, in which, nanoparticles were mixed with the base oil and then dispersed using magnetic stirrer, dispersants and ultrasonic processor...

article

Optimal location of remote terminal units in distribution systems using genetic algorithm

A.A.E. Shammah, A. Abou El-Ela, Ahmed M. Azmy

Electric Power Systems Research > 2012 > 89 > Complete > 165-170

The paper presents a technique to investigate the problem associated with the optimal location of remote terminal units (RTUs) within distribution networks. The RTUs enable monitoring different locations, which are linked to the central control room (CCR) through a communication system. The multi-population real-coded genetic algorithm (GA) is used as an optimization technique to select the optimal...

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Keywords

OPTIMIZATION (4)
SMART GRID (4)
DISTRIBUTED GENERATION (3)
FUEL CELLS (3)
NANOFLUIDICS (3)
NANOPARTICLES (3)
DEMAND RESPONSE (2)
DEMAND SIDE MANAGEMENT (2)
DISTRIBUTION AUTOMATION (2)
DISTRIBUTION SYSTEMS (2)
DYNAMIC PRICING (2)
ECONOMICS (2)
ELECTRIC BREAKDOWN (2)
ELECTRIC VEHICLE (2)
ENERGY MANAGEMENT (2)
FAULT LOCATION (2)
GA OPTIMIZATION (2)
GENERATORS (2)
GENETIC ALGORITHM (2)
HOME AUTOMATION (2)
OIL INSULATION (2)
POWER TRANSFORMERS (2)
REACTIVE POWER (2)
ROTORS (2)
WIND TURBINES (2)
ADAPTIVE DE ALGORITHM (1)
ADAPTIVE DIFFERENTIAL EVOLUTION ALGORITHM (1)
ADAPTIVE PENALTY FACTOR (1)
ADVANCED DISTRIBUTION AUTOMATION SYSTEM (1)
AGING (1)
ANALYTICAL MODELS (1)
ARCHITECT-CENTERED DESIGN PROCESS (1)
AUTOMATION (1)
BACK PROPAGATION (1)
BIOLOGICAL SYSTEM MODELING (1)
BREAKDOWN STRENGTH (1)
BRIEFING STAGE (1)
BUILDINGS (1)
CAD (1)
CASCADE CORRELATION (1)
CERVIX (1)
COMPRESSIVE STRENGTH (1)
COMPUTATIONAL MODELING (1)
COMPUTER-BASED LCA TOOL (1)
COMPUTERS (1)
CONTROL SYSTEMS (1)
CONVERTER CONTROL (1)
DFIG (1)
DIELECTRIC CONSTANT (1)
DIELECTRIC MEASUREMENT (1)
DIELECTRICS (1)
DISPERSION (1)
DISPERSION BEHAVIOR (1)
DISTRIBUTED GENERATION IMPACT (1)
DISTRIBUTION SYSTEM (1)
DOUBLY FED INDUCTION GENERATOR (DFIG) (1)
DYNAMIC BEHAVIOR (1)
DYNAMIC MODELLING (1)
EMERGENCY OPERATING CONDITIONS (1)
ENERGY LOSS (1)
ENERGY LOSSES (1)
EVOLUTIONARY COMPUTATION (1)
FAULT RIDE-THROUGH (FRT) CAPABILITY (1)
FLEXIBLE AC TRANSMISSION SYSTEMS (1)
FLEXIBLE ALTERNATING CURRENT TRANSMISSION SYSTEMS UNITS (1)
FUEL CELL (1)
GENERATING UNITS (1)
GENETIC ALGORITHMS (1)
HOME ENERGY GATEWAY (1)
IEEE 30-BUS TEST SYSTEMS (1)
IEEE 9-BUS TEST SYSTEMS (1)
IMPEDANCE-BASED TECHNIQUE (1)
INVESTMENT (1)
ISOLATION AND SERVICE RESTORATION (1)
KNOWLEDGE BASE SYSTEM (1)
KNOWLEDGE BASED SYSTEMS (1)
LIFE CYCLE ASSESSMENT (1)
LIFECYCLE ASSESSMENT TOOLS (1)
LIGHT WEIGHT CONCRETE (1)
LIMITING (1)
LINEAR PROGRAMMING (1)
LOAD FLOW (1)
LOAD MANAGEMENT (1)
LOADING (1)
LOOP DISTRIBUTION SYSTEM (1)
MAGNETIC RESONANCE IMAGING (1)
MATERIALS (1)
MATHEMATICAL MODEL (1)
MAXIMUM POWER POINT TRACKING (MPPT) (1)
MICROSCOPY (1)
MODELING (1)
MODIFIED DIFFERENTIAL EVOLUTION ALGORITHM (1)
MULTI-OBJECTIVE FUNCTION (1)
MULTIOBJECTIVE DE ALGORITHM (1)
NANOFLUIDS (1)
NATURAL GAS (1)
NEURAL NETWORKS (1)
OIL-BASED NANOFLUIDS (1)
OPTICAL MICROSCOPY (1)
OPTIMAL REACTIVE POWER MANAGEMENT (1)
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ieee (14)
Elsevier (6)
Springer (1)
Wiley (1)

INFONA - science communication portal

Search results for: Ahmed M. Azmy

Placenta Accreta Spectrum (PAS) disorders: incidence, risk factors and outcomes of different management strategies in a tertiary referral hospital in Minia, Egypt: a prospective study

Adaptive differential evolution algorithm for efficient reactive power management

Defining optimal DG penetration for minimizing energy losses concerning repairing fault periods

Optimal automation level for reliability improvement and self-healing MV distribution networks

Optimal allocation of TCSCs by adaptive DE algorithm

Dynamic pricing for demand-side management within smart grid environment

Operation optimization of distributed generation using artificial intelligent techniques

Defining the practical constraints of inserting DG units in distribution systems regarding protection schemes

Controller performance of variable speed wind driven doubly-fed induction generator

Dielectric properties of aged mineral oil filled with TiO2 nanoparticles

Optimizing distributed generation operation for residential application based on automated systems

Optimizing DG penetration in distribution networks concerning protection schemes and technical impact

Dispersion behavior and breakdown strength of transformer oil filled with TiO₂ nanoparticles

Effect of process parameters on the dynamic behavior of polymer electrolyte membrane fuel cells for electric vehicle applications

Impedance-based fault location technique for distribution systems in presence of distributed generation

Demand-side management-based dynamic pricing within smart grid environment

Performance analysis of polymer electrolyte membrane fuel cells for electric vehicle applications

Improving Fault Ride-Through Capability of DFIG-Based Wind Turbine Using Superconducting Fault Current Limiter

Effect of titania nanoparticles on the dielectric properties of transformer oil-based nanofluids

Optimal location of remote terminal units in distribution systems using genetic algorithm

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