Ahmed Mohamed Sayed Ahmed, Ph.D.
Adjunct Associate Professor
- Milwaukee WI UNITED STATES
- Electrical Engineering and Computer Science
Dr. Ahmed Mohamed Sayed Ahmed is an electrical engineer with expertise in firmware engineering and power electronics.
Education, Licensure and Certification
Ph.D.
Electrical Machines & Power Electronics
Marquette University
2009
M.S.
Power Electronics
Cairo University
2003
B.S.
Electrical Engineering
Cairo University
1998
Biography
Accomplishments
IEEE Power and Energy Society transaction prize paper
2012
Rockwell Automation Capture the Moment
2015
Rockwell Automation Capture the Moment
2007
Rockwell Automation Capture the Moment
2010
Rockwell Automation Innovation Award
2009
Affiliations
- Institute of Electrical and Electronics Engineers (IEEE) : Senior Member
- IEEE Power Electronics Chapter: Co-founder and Chair
- IEEE Power & Energy Chapter, Greater Milwaukee: Chair
Event and Speaking Appearances
Active Front End Power Converter Applications in Regenerative Motor-Drive Systems and Grid-Tie Inverters
Invited Guest Speaker University of Wisconsin-Milwaukee
Power Quality Test Bed for Motor-Drive Testing
WEMPEC Symposium University of Wisconsin-Milwaukee
Invited Guest Speaker
ECCE Department Distinguished Lecturer Marquette University
Patents
Electrical Power Quality Test-bed and Method
8373406 B2
Lead inventor
Phase Loss Detection in Active Front End Converters
20170272023 A1
Lead inventor
Industrial System Phase Sag Detection
9535133 B2
Lead Inventor
Single Phase Operation of a Three-phase Drive System
8988026
Lead inventor
Power Conversion System With Dc Bus Regulation for Abnormal Grid Condition Ride Through
9847733
Lead inventor
Selected Publications
Active front end motor-drive system operation under power and phase loss
IEEE, 2018Sayed-Ahmed, A., Seibel, B., Kerkman, R.J.
Active Front End “AFE” power converters are widely used in numerous renewable energy applications including but not limited to photovoltaic, wind power as well as industrial regenerative motor-drive systems. These power converters are extensively applied in industrial applications that mandate reduced input current harmonics and flexible bidirectional power flow.
Hybrid damping for active front end converter
IEEE Energy Conversion Congress and Exposition (ECCE), 2016Patel, Y.P., Ahmed, A.S.M.S., Wei, L.
Breakthroughs in power electronics devices enabled the utilization of the IGBT as the main power switch in AFE converters and enabled the emergence of the fully controlled Active Front End, “AFE”, and low input harmonic solution. This solution employs voltage and current control loops and switching with relatively high switching frequencies of greater than 2 KHz in most applications. The AFE converter is usually connected to the grid through an LCL filter. In this paper, a hybrid technique is introduced to damp the resonance condition that may result due to the existence of the LCL filter. This technique relies on the concept of hybrid damping which combines the advantages of both active and passive damping previously introduced in literature. It will also be shown that the introduced technique overcomes previous limitations which renders this technique more practical and highly applicable to reliable industrial products.
A new instantaneous point on wave voltage sag detection algorithm & validation
IEEE Energy Conversion Congress and Exposition (ECCE), 2016Cui, Y., Sayed-Ahmed, A., Vadhavkar, P., Seibel, B.J., Kerkman,
In industrial applications, power quality has been an issue drawing increasing concerns due to its severe consequences on system performance and downtime cost. Voltage sags are classified as one of the most common power quality issues. In order to guarantee system operation under several line sag scenarios, international standards such as SEMI F47, IEC-61000-4-34, and IEC-61000-4-11 have been established as guidelines for electrical/electronics manufacturers. In this paper, an innovative point on wave sag detection is introduced. Although the main focus of this work is centered on applications related to regenerative motor-drive systems, this approach can be utilized in a myriad of other applications such as grid-tie inverters, uninterrupted power supplies and advanced relay protection. In addition, the introduced technique is very effective at detecting repeated line sag conditions. The introduced detection method has been experimentally validated using a 20 HP regenerative motor-drive system setup under various line sag scenarios.
Analysis and assessment of microgrid stability using the Nu gap approach
IEEE Energy Conversion Congress and Exposition (ECCE), 2014Alfares, A., Sayed-Ahmed, A.
In this paper, a robust control system analysis of an isolated microgrid is introduced. This analysis is based on the concept of multiloop stability margin, and the Nu gap approach. This approach helps the system's designer to ensure system stability under varying load conditions assuming a conventional cascaded control structure that employs an outer voltage control loop and an inner current control loop. Analysis and nonlinear detailed time domain simulation results are included.
Tuning of phase locked loop for industrial regenerative motor-drive systems
IEEE, 2013Sayed-Ahmed, A., Kerkman, R., Seibel, B.
Regenerative motor-drive systems are utilized in several industrial applications that require frequent
power generation back to the grid. In these applications, the standard front-end diode bridge
commonly used in non-regenerative drives is replaced by an Active Front End “AFE” power converter. The main advantages of the AFE are that it can regenerate power back to the grid, and provide unity power factor operation with a very low total harmonic distortion. The phase locked loop “PLL” is one of the most critical control subsystems in any industrial regenerative motor-drive system. It provides the control of the front-end power converter an accurate knowledge of the utility angle and grid steady state and transient conditions.
