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Ahmed Sayed Ahmed, Ph.D. - Milwaukee School of Engineering. Milwaukee, WI, US

Ahmed Sayed Ahmed, Ph.D.

Adjunct Associate Professor | Milwaukee School of Engineering

Milwaukee, WI, UNITED STATES

Dr. Ahmed Mohamed Sayed Ahmed is an electrical engineer with expertise in firmware engineering and power electronics.

Education, Licensure and Certification (3)

Ph.D.: Electrical Machines & Power Electronics, Marquette University 2009

M.S.: Power Electronics, Cairo University 2003

B.S.: Electrical Engineering, Cairo University 1998

Biography

Dr. Ahmed Mohamed Sayed Ahmed is an expert in firmware engineering and power electronics.

Accomplishments (5)

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 (3)

  • 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 (3)

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 (5)

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 (5)

Active front end motor-drive system operation under power and phase loss

IEEE, 2018

Sayed-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.

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Hybrid damping for active front end converter

IEEE Energy Conversion Congress and Exposition (ECCE), 2016

Patel, 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.

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A new instantaneous point on wave voltage sag detection algorithm & validation

IEEE Energy Conversion Congress and Exposition (ECCE), 2016

Cui, 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.

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Analysis and assessment of microgrid stability using the Nu gap approach

IEEE Energy Conversion Congress and Exposition (ECCE), 2014

Alfares, 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.

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Tuning of phase locked loop for industrial regenerative motor-drive systems

IEEE, 2013

Sayed-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.

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