Design of Multilayered K-Band and Ka-Band Slot-Coupled Microstrip 90° Hybrid Couplers Employing Circular Ring Patch Shapes

Research Abstract
NULL
Research Authors
A. Alaqeel, S. Almorqi, O. M. Haraz, S. A. Alshebeili, A.-R. Sebak
Research Department
Electrical Engineering Department
Research Journal
Wireless Personal Communications
Research Member
Osama Mohamed Haraz Ahmed
Research Pages
pp. 653–666
Research Publisher
Springer
Research Rank
1
Research Vol
92
Research Website
DOI 10.1007/s11277-016-3569-1
Research Year
2017

Tri-band compact ACS-fed meander-line antenna for wireless communications

Research Abstract
NULL
Research Authors
A. A. R. Saad, A. A. Ibrahim, O. M. Haraz, and A. Elboushi
Research Department
Electrical Engineering Department
Research Journal
International Journal of Microwave and Wireless Technologies
Research Member
Osama Mohamed Haraz Ahmed
Research Pages
page 1 of 9
Research Publisher
Cambridge University Press and the European Microwave Association
Research Rank
1
Research Vol
doi:10.1017/S1759078717000745
Research Website
NULL
Research Year
2017

Analysis and Control of HVDC Transmission Power System

Research Abstract
This paper presents a design of converter controllers and filters of Line Commutated Converter High voltage direct current (LCC-HVDC) power transmission system to increase loadability and reliability of long power transmission. Also the proposed tuned PI controllers for HVDC Converters are verified in sense of HVDC transmissionsystem performance and reliability. The studied system performances are compared with HVAC transmission systems in terms of power transfer quantity and reliability for a wide range of transmission distances and operating conditions. The Power Quality of HVDC transmission system is studied with Filters and proposed PI controllers .The two transmission systems (HVDC & HVAC) are simulated using MATLAB SIMULINK software package. With the control strategy, the HVDC system can provide a useful and economical way to transmit electric power over the long distance compared with HVAC system.
Research Authors
G.El-Saady, El-Nobi A.Ibrahim Ahmed H.Okilly
Research Department
Electrical Engineering Department
Research Journal
Power Systems Conference (MEPCON), 2016 Eighteenth International Middle East, pp. 190-198, IEEE, Dec 2016.
Research Member
Jaber Al-Saadi Ahmed Taha
Research Pages
NULL
Research Publisher
IEEE
Research Rank
3
Research Vol
978-1-4673-9063-7/16/$31.00 ©2016 IEEE
Research Website
http://ieeexplore.ieee.org/document/7836890/
Research Year
2016

Analysis and Control of HVDC Transmission Power System

Research Abstract
This paper presents a design of converter controllers and filters of Line Commutated Converter High voltage direct current (LCC-HVDC) power transmission system to increase loadability and reliability of long power transmission. Also the proposed tuned PI controllers for HVDC Converters are verified in sense of HVDC transmissionsystem performance and reliability. The studied system performances are compared with HVAC transmission systems in terms of power transfer quantity and reliability for a wide range of transmission distances and operating conditions. The Power Quality of HVDC transmission system is studied with Filters and proposed PI controllers .The two transmission systems (HVDC & HVAC) are simulated using MATLAB SIMULINK software package. With the control strategy, the HVDC system can provide a useful and economical way to transmit electric power over the long distance compared with HVAC system.
Research Authors
G.El-Saady, El-Nobi A.Ibrahim Ahmed H.Okilly
Research Department
Electrical Engineering Department
Research Journal
Power Systems Conference (MEPCON), 2016 Eighteenth International Middle East, pp. 190-198, IEEE, Dec 2016.
Research Member
Nubian Ahmed Ibrahim Hassan Omar
Research Pages
NULL
Research Publisher
IEEE
Research Rank
3
Research Vol
978-1-4673-9063-7/16/$31.00 ©2016 IEEE
Research Website
http://ieeexplore.ieee.org/document/7836890/
Research Year
2016

Analysis and Control of HVDC Transmission Power System

Research Abstract
This paper presents a design of converter controllers and filters of Line Commutated Converter High voltage direct current (LCC-HVDC) power transmission system to increase loadability and reliability of long power transmission. Also the proposed tuned PI controllers for HVDC Converters are verified in sense of HVDC transmissionsystem performance and reliability. The studied system performances are compared with HVAC transmission systems in terms of power transfer quantity and reliability for a wide range of transmission distances and operating conditions. The Power Quality of HVDC transmission system is studied with Filters and proposed PI controllers .The two transmission systems (HVDC & HVAC) are simulated using MATLAB SIMULINK software package. With the control strategy, the HVDC system can provide a useful and economical way to transmit electric power over the long distance compared with HVAC system.
Research Authors
G.El-Saady, El-Nobi A.Ibrahim Ahmed H.Okilly
Research Department
Electrical Engineering Department
Research Journal
Power Systems Conference (MEPCON), 2016 Eighteenth International Middle East, pp. 190-198, IEEE, Dec 2016.
Research Member
Ahmed Hassan Hamed okilly
Research Pages
NULL
Research Publisher
IEEE
Research Rank
3
Research Vol
978-1-4673-9063-7/16/$31.00 ©2016 IEEE
Research Website
http://ieeexplore.ieee.org/document/7836890/
Research Year
2016

Sequential Technique Based AC-DC Power Flow Analysis for Medium and Long Transmission Systems

Research Abstract
The modern electric utility industry is currently more and more attention to HVDC transmission as a practical alternative to HVAC transmission. It is useful supplement to rapid and smooth power flow control, more economical choice and small power loss for long transmission systems. An electric power system with DC links requires a special analysis for power flow study that takes their characteristics into account. This paper presents an AC-DC load flow algorithm to solve a power flow problem with DC links. This algorithm is tested using medium and long transmission standard test systems. Digital results using the proposed sequential method are compared w ith a previous work. The effect of load change in HVDC control parameters is studied. A comparison between HVAC and HVDC transmission systems based on power losses are also performed.
Research Authors





G.El-Saady, El-NobiA.Ibrahim, Ahmed H.Okilly
Research Department
Electrical Engineering Department
Research Journal
Middle East Power System (MEPCON) Conference, Egypt, Dec 2015.
Research Member
Jaber Al-Saadi Ahmed Taha
Research Pages
NULL
Research Publisher
Middle East Power System (MEPCON) Conference
Research Rank
3
Research Vol
NULL
Research Website
NULL
Research Year
2015

Sequential Technique Based AC-DC Power Flow Analysis for Medium and Long Transmission Systems

Research Abstract
The modern electric utility industry is currently more and more attention to HVDC transmission as a practical alternative to HVAC transmission. It is useful supplement to rapid and smooth power flow control, more economical choice and small power loss for long transmission systems. An electric power system with DC links requires a special analysis for power flow study that takes their characteristics into account. This paper presents an AC-DC load flow algorithm to solve a power flow problem with DC links. This algorithm is tested using medium and long transmission standard test systems. Digital results using the proposed sequential method are compared w ith a previous work. The effect of load change in HVDC control parameters is studied. A comparison between HVAC and HVDC transmission systems based on power losses are also performed.
Research Authors





G.El-Saady, El-NobiA.Ibrahim, Ahmed H.Okilly
Research Department
Electrical Engineering Department
Research Journal
Middle East Power System (MEPCON) Conference, Egypt, Dec 2015.
Research Member
Nubian Ahmed Ibrahim Hassan Omar
Research Pages
NULL
Research Publisher
Middle East Power System (MEPCON) Conference
Research Rank
3
Research Vol
NULL
Research Website
NULL
Research Year
2015

Sequential Technique Based AC-DC Power Flow Analysis for Medium and Long Transmission Systems

Research Abstract
The modern electric utility industry is currently more and more attention to HVDC transmission as a practical alternative to HVAC transmission. It is useful supplement to rapid and smooth power flow control, more economical choice and small power loss for long transmission systems. An electric power system with DC links requires a special analysis for power flow study that takes their characteristics into account. This paper presents an AC-DC load flow algorithm to solve a power flow problem with DC links. This algorithm is tested using medium and long transmission standard test systems. Digital results using the proposed sequential method are compared w ith a previous work. The effect of load change in HVDC control parameters is studied. A comparison between HVAC and HVDC transmission systems based on power losses are also performed.
Research Authors





G.El-Saady, El-NobiA.Ibrahim, Ahmed H.Okilly
Research Department
Electrical Engineering Department
Research Journal
Middle East Power System (MEPCON) Conference, Egypt, Dec 2015.
Research Member
Ahmed Hassan Hamed okilly
Research Pages
NULL
Research Publisher
Middle East Power System (MEPCON) Conference
Research Rank
3
Research Vol
NULL
Research Website
NULL
Research Year
2015

Effect of ambient Temperature on Concrete Bond Characteristics of Epoxy Coated Bars

Research Abstract
Bond characteristics have been investigated of cylindrical specimens with epoxy coated and uncoated bars under different ambient conditions. Forty six pull-out test carried cut on cylindrical specimens of 15 cm diameter and 30cm height with mild steel and deformed tensile steel bars. some of them were tested after exposed to temperature between 50 and 400O. Thickness of the epoxy coating film and grade of both concrete and steel were taken as variables. The results showed that both bond strength and free end slip are largely affected by both ambient temperature and thickness of the coated film.
Research Authors
Dr. Yehia A. hassanean
Research Department
Civil Engineering Department
Research Journal
AL.AZHAR ENGINEERING Fifth INTESNAT1ONAL CONFERENCE
Research Member
Yahia Abdel-Azim Hassanein Mekhemer
Research Pages
404-416
Research Publisher
AL.AZHAR ENGINEERING Fifth INTESNAT1ONAL CONFERENCE
Research Rank
3
Research Vol
NULL
Research Website
NULL
Research Year
1997

Analysis of concrete shell structures subjected to high temperature by using layered elements

Research Abstract
This work is a development of constitutive model for concrete by the theory of plasticity at high temperature. In this model, non-uniform work hardening plasticity model adopts the most sophisticated failure model of Willam - Warnke five-parameter model. This model was modified to include the effect of the temperature on concrete structures. The developed model can predict the effect of the fire on concrete structures at diffirent types of temperature loading from room temperature to very high temperature
Research Authors
Eng. Khaled A. Mahmoud, Dr. Yehia A. Hassanean and Prof. Dr. A. Megahid
Research Department
Civil Engineering Department
Research Journal
JES Journal of Engineering Sciences
Research Member
Abd Rahman Mujahid Ahmed Ghoneim
Research Pages
NULL
Research Publisher
JES Journal of Engineering Sciences
Research Rank
2
Research Vol
NULL
Research Website
htt://www.aun.edu.eg/journals/reserches/journal of engineering science.htm
Research Year
2005
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