Dr KHALED AHMED

Senior Lecturer

Dr KHALED AHMED

Contact Details

Telephone: +44 (0)1224 272795
Fax: +44 (0)1224 27-2497
Email: khaled@abdn.ac.uk
Address: Fraser Noble Building (Room 268) Kings College Aberdeen Scotland United Kingdom AB24 3UE
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Biography

  

Dr. Khaled Ahmed received the B.Sc. (first class honors) and M.Sc. degrees from the Faculty of Engineering, Alexandria University, Egypt in 2002 and 2004, respectively. He received the Ph.D. degree in electrical engineering from the electronic and Electrical Engineering Department,  University of Strathclyde, Glasgow, UK, 2008. 

Publications:

Books:

High Voltage Direct Current Transmission: Converters, systems, and DC Grids

Journals/Conferences:

IEEE Xplore 

 

Research Interests

 

  • Distributed generation and microgrids for standalone and grid-connected applications  
  • Wind farm integration using power electronics
  • MPPT control for photovoltaic grid connected systems
  • Resonant converters for high voltage high power systems
  • Power quality modification using active power filter
  • high power high voltage DC/DC converters
  • Multilevel converters for high power application (FACTS & HVDC)

Current Research

  •  Modular DC/DC converter for high power applications
  •  Operation and design of modular multilevel converters for HVDC
  •  Parallel operation of inverter based distributed generation units in microgrids
  •  MPPT techniques for wind energy and PV systems.

 

PhD Supervision

3-PhD students under working and 5 have been graduated: 

  1. Multi-terminal Current Source Based DC Transmission System for Multiple Wind Turbine Interfacing. (Yuanye Xia- graduated 2011)
  2. Design, Analysis, and Modelling of Modular Medium-Voltage DC/DC Converter Based Systems. (Ahmed A. Aboushady- graduated 2013)
  3. Design and Control of Photovoltaic Systems in Distributed Generation. (Bader N. Alajmi- graduated 2013)
  4. Parallel Connected Inverter Operation in an Islanded Microgrid. (Mohd A. Roslan - graduated 2013)
  5. Comparative investigation between voltage and current source inverter based renewable distributed energy source in smart networks. (Syahrul A. Azmi- graduated 2014)
  6. Dual active bridge, parallel resonant converters for high power applications. (Mohammad I. Abdul Rahman- ongoing
  7. Modular Dual Active Bridge DC/DC Converter for HVDC Applications. (Yasen A. Harrye- ongoing)
  8. Circuit Optimisation for Multi-infeed HVDC systems. (Xuyang Deng- ongoing)
  9. Grid interfacing of multi-megawatt PV systems. (Abdullah Althowaini- ongoing)

Research Grants

  • EPSRC (Engineering and Physical Sciences Research Council) grant no EP/K006428/1, “DC Networks with DC/DC Converters for Integration of Large Renewable Sources ", Co-PI, £734,786, March 2013-February 2016.
  • Scottish Hydro Electric Transmission Ltd, for a PhD studentship, Co-PI, £75, 2012.
  • Kick Start Award, Encompass project, “Coastal Solar Array”, PI, £5k, 2014.
  • Carnegie Trust for the Universities of Scotland Research Grant, PI, £7.5k, 2015.
  • Royal Society Research Grant, PI, £15k, 2015.
  • British Council Researcher Link Workshop Grant, PI, £32k, 2015.
  • Scottish Funding Council, “Micro Wind turbine” PI, £5k, 2016.

Teaching Responsibilities

  • Electrical Machines and Drives (EG40FD) 
  • Electronic Systems (EG2504)
  • Electrical & Electronics Engineering Design (EG3579)
  • Renewable Energy 1 (Solar & Geothermal), (EG501J)

External Responsibilities

  • Senior member IEEE, Industrial and Power Electronics Societies.
  • Peer reviewer for IEEE/IET transactions and conferences.
  • Editorial board member of International Journal of Renewable Energy Technology.
  • Editorial board member of Electric Power Components and Systems Journal.
  • Editorial board member of Innovative Engineering Journal.
  • Member of Scottish Institute for Solar Energy Research (SISER).
  • A part of a 2-lecturer team who designed and delivered a continuing professional development (CPD) course on HVDC for the Scottish and Southern Energy (SSE) HVDC technology engineering team, UK.

Admin Responsibilities

  • International Foundation Programme Coordinator 
  • Professional Doctorate Degree (EngD) Coordinato
  • Engineering Scholarships Coordinator 

PUBLICATIONS

JOURNAL

[1] K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Passive Filter Design for Three-Phase Inverter Interfacing in Distributed Generation’, Electrical Power Quality and Utilisation (EPQU) Journal May 2008, pp. 49-59.

[2] K.H. Ahmed, A.M. Massoud, S.J. Finney, and B.W. Williams,  ‘Sensorless Current Control of Three-Phase Inverter-Based Distributed Generation’, IEEE Transactions on Power Delivery Volume 24,  Issue 2,  April 2009 pp. 919 – 929.

[3] K.H. Ahmed, A.M. Massoud, S.J. Finney, and B.W. Williams, ‘An Autonomous Adaptive Sensorless Controller of Inverter-Based Islanded-Distributed Generation System’, IET Journal of Power Electronics, Volume 2, Issue 3, May 2009, pp. 256 – 266.

[4] A.M. Massoud, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘A Harmonic Distortion-Based Island Detection Technique for Inverter-Based Distributed Generation’, IET Journal of Renewable Power Generation, Volume 3, Issue 4, December 2009, pp. 493 – 507.

[5] K.H. Ahmed, A.M. Massoud, S.J. Finney, and B.W. Williams, ‘A Modified Stationary Reference Frame Based Predictive Current Control with Zero Steady-State Error for LCL Coupled Inverter-Based Distributed Generation Systems’, IEEE Transactions on Industrial Electronics, Volume 58, Issue 4, April 2011 , pp. 1359 - 1370.

[6] B.N. Alajmi, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Fuzzy Logic Controlled Approach of a Modified Hill Climbing Method for Maximum Power Point in Microgrid Stand-alone Photovoltaic System’, IEEE Transactions on Power Electronics, Volume: 26, Issue: 4, April 2011, pp. 1022 - 1030.

[7] M.A. Roslan, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Improved Instantaneous Average Current Sharing Control Scheme for Parallel Connected Inverter Considering Line Impedance Impact in Microgrid Networks’, IEEE Transactions on Power Electronics, Volume: 26 , Issue: 3,  March 2011 , pp. 702 - 716.

[8] Y.Y. Xia, K.H. Ahmed, and B.W. Williams, ‘Torque ripple analysis and reduction for wind energy conversion systems using uncontrolled rectifier and boost converter’, IET Journal of Renewable Power Generation, Volume 5, Issue 5, Sep. 2011, pp.377–386.

[9] Y.Y. Xia, K.H. Ahmed, and B.W. Williams, ‘A New Maximum Power Point Tracking Technique for Permanent Magnet Synchronous Generator Based Wind Energy Conversion System’, IEEE Transactions on Power Electronics, Volume 26, Issue 12, Dec. 2011, pp. 3609 – 3620.

[10] B.N. Alajmi, K.H. Ahmed, G.P. Adam, S.J. Finney, and B.W. Williams, ‘Modular multilevel inverter with maximum power point tracking for grid connected photovoltaic application’, Journal of Energy and Power Engineering 6 (2012)

[11] G.P. Adam, K.H. Ahmed, S.J. Finney, K. Bell and B.W. Williams, ‘New Breed of Network Fault Tolerant Voltage Source Converter HVDC Transmission System’, IEEE Transactions on Power systems, Volume   28, Issue 1, Feb. 2013, pp. 335- 346.

[12] Y.Y. Xia, K.H. Ahmed, and B.W. Williams, ‘Wind Turbine Power Coefficient Analysis of a New Maximum Power Point Tracking Technique’, IEEE Transactions on Industrial Electronics, Volume 60, Issue 3, March 2013, pp. 1122-1132.

[13] B.N. Alajmi, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘A Maximum Power Point Tracking Technique for Partially Shaded Photovoltaic Systems in Microgrids’, IEEE Transactions on Industrial Electronics, Volume 60, Issue 4, April 2013, pp. 1596     - 1606.

[14] S.A. Azmi, G.P. Adam, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Grid Interfacing of Multi-Megawatt Photovoltaic Inverters’, IEEE Transactions on Power Electronics, Volume 28, Issue 6, pp. June 2013, pp. 2770- 2784.

[15] B.N. Alajmi, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Single-Phase Single-Stage Transformer- less Grid Connected PV System’, IEEE Transactions on Power Electronics, Volume 28, Issue 6, pp. June 2013, pp. 2664- 2676.

[16] A.A. Aboushady, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Linearized Large Signal Modelling, Analysis and Control Design of Phase-Controlled Series-Parallel Resonant Converters using State Feedback’, IEEE Transactions on Power Electronics, Volume 28, Issue 8, August 2013, pp. 3896- 3911.

[17] G.P. Adam, K.H. Ahmed, I. Abdelsalam, and B.W. Williams, ‘Hybrid Multilevel Voltage Source Converter for HVDC Applications’, accepted for publication IEEE Transactions on Power Electronics.

[18] M.S. Hamad, M.I. Masoud, K.H. Ahmed, and B.W. Williams ‘A Shunt Active Power Filter for a Medium-Voltage Twelve-pulse Current Source Converter using Open Loop Control Compensation’, accepted for publication IEEE Transactions on Industrial Electronics.

[19] Y.Y. Xia, K.H. Ahmed, and B.W. Williams, ‘A PWM Current Source Based DC Transmission System for Multiple Wind Turbine Interfacing’, accepted for publication IEEE Journal of Emerging and Selected Topics in Power Electronics, 2014. 

CONFERENCE

[1] K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Passive Filter Design for Three-Phase Inverter Interfacing in Distributed Generation’, IEEE Compatibility in Power Electronics (CPE) Conf. June 200, pp. 1-9.

[2] K.H. Ahmed, A.M. Massoud, S.J. Finney, and B.W. Williams, ‘Modified Current Control of Three-phase Inverter Interfacing in Distributed Generation’, IEEE Power Electronics, Machines and Drives (PEMD) Conf. April 2008, pp. 401-405.

[3] K.H. Ahmed, A.M. Massoud, S.J. Finney, and B.W. Williams, ‘Autonomous control of a PWM Inverter in Islanded Distributed Generation with Different feedback Signals’, IEEE Power Electronics, Machines and Drives (PEMD) Conf. April 2008, pp. 573-577.

[4] K.H. Ahmed, A.M. Massoud, S.J. Finney, and B.W. Williams, ‘Optimum Selection of State Feedback Variables PWM Inverters Control’, IEEE Power Electronics, Machines and Drives (PEMD) Conf. April 2008, pp. 125-129.

[5] K.H. Ahmed, A.M. Massoud, S.J. Finney, and B.W. Williams, ‘Stationary Frame Predictive Current Control with Zero Steady State Error’, IEEE Power Electronics Specialist Conference (PESC) June 2008,  , pp. 1495-1501

[6] K.H. Ahmed, A.M. Massoud, S.J. Finney, and B.W. Williams, ‘Sensorless Modified Adaptive Kalman Filter for Current Control of a Three-Phase Inverter Based Distributed Generation’, IEEE International Symposium on Industrial Electronics (ISIE) July 2008, pp. 1592 – 1597.

[7] K.H. Ahmed, A.M. Massoud, S.J. Finney, and B.W. Williams, ‘An Autonomous Adaptive Sensorless Controller of Inverter-Based Islanded Distributed Generation System’, IEEE International Symposium on Industrial Electronics (ISIE) July 2008, pp. 1586 – 1591.

[8] Z.M. Shafik, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Nanocrystalline cored transformer design and implementation for a high Current low voltage DC/DC converter’, IEEE Power Electronics, Machines and Drives (PEMD) Conf., April 2010, pp. 1-6.

[9] A.A. Aboushady, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Steady-State Analysis of Full-Bridge Series Resonant Converter with Phase-Shift and Frequency Control’, IEEE Power Electronics, Machines and Drives (PEMD) Conf., April 2010, 1-6.

[10] A.A. Aboushady, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Performance Analysis of a New Modular Nano-Crystalline Core Transformer Based Converter for Medium Voltage DC Transmission Applications’, IEEE Power Electronics, Machines and Drives (PEMD) Conf., April 2010, 1-6.

[11] K.H. Ahmed, A.M. Massoud, S.J. Finney, and B.W. Williams, ‘New Voltage Regulation Techniques for Low Voltage Radial Feed PWM Inverter Based Distributed Networks’, IEEE International Symposium on Industrial Electronics (ISIE) July 2010, pp. 2241 – 2246.

[12] A.A. Aboushady, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Discrete Time Domain Small Signal Modeling of FullBridge Phase Shifted Series Resonant Converter’ IEEE Energy Conversion Congress and Exposition (ECCE) Conf. 2010, pp. 2019 – 2024.

[13] K.H. Ahmed, M.A. Hamad, S.J. Finney, and B.W. Williams, ‘DC-Side Shunt Active Power Filter for Line Commutated Rectifiers to Mitigate the Output Voltage Harmonics’ IEEE Energy Conversion Congress and Exposition  (ECCE) Conf. 2010, pp. 151 – 157.

[14] G.P. Adam, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘AC Fault Ride-through Capability of VSC-HVDC Transmission Systems’, IEEE Energy Conversion Congress and Exposition (ECCE)  Conf. 2010, pp. 3739 – 3745.

[15] K.H. Ahmed, A.M. Massoud, S.J. Finney, and B.W. Williams, ‘A Survey of Control Techniques for Three-Phase Inverter-Based Distributed Generation’, 2nd International Conference on Microgrid 2011.

[16] M.A. Roslan, K. H. Ahmed, S. J. Finney, and B. W. Williams ‘Improved Control for Parallel Connected Inverters in Standalone Microgrid Networks’, 2nd International Conference on Microgrid 2011.

[17] A.S. Abdel-khalik, and K.H. Ahmed, ‘Performance Evaluation of Grid Connected Wind Energy Conversion Systems with Five-phase Modular Permanent Magnet Synchronous Generators having Different Slot and Pole Number Combinations’, IEEE International Electric Machines and Drives Conf. (IEMDC), May 2011, pp. 1119 – 1124.

[18] G.P. Adam, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Modular Multilevel Converter for Medium-Voltage Applications’, IEEE International Electric Machines and Drives Conf. (IEMDC), May 2011, pp. 1013 – 1018.

[19] Y.Y. Xia, K.H. Ahmed, and B.W. Williams, ‘Different Torque Ripple Reduction Methods for Wind Energy Conversion Systems Using Diode Rectifier and Boost Converter’, IEEE International Electric Machines and Drives Conf. (IEMDC), May 2011, pp. 729 – 734.

[20] K.H. Ahmed, A.M. Massoud, S.J. Finney, and B.W. Williams, ‘A Synchronous DQ Frame Controller via an LCL Coupled Filter Under Unbalanced Three-Phase Voltage Supply Conditions’, International Power Engineering Energy and Electrical Drives  (POWERENG) Conf. 2011, June 2011, pp. 1 – 6.

[21] A.A. Aboushady, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Fuzzy Self-tuning PI Controller for Phase-Shifted Series Resonant Converters’, International Power Engineering Energy and Electrical Drives (POWERENG) Conf., June 2011, pp. 1 – 6.

[22] G.P. Adam, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘H-Bridge modular multilevel converter for high-voltage applications’, The 21st International Conference and Exhibition Electricity Distribution (Cired 2011).

[23] K.H. Ahmed, G.P. Adam, S.J. Finney, and B.W. Williams, ‘Voltage Sensorless Predictive Current Control with Interfacing Parameter Estimation for Grid Connected Converter Operation’, IEEE PowerTech, June 2011, pp. 1 – 6.

[24] G.P Adam, K.H Ahmed, N.K Singh, S.J Finney, and B.W Williams, ‘A Hybrid Multilevel Converter for Medium and High Voltage Applications’ IEEE PowerTech, June 2011, pp. 1 – 6.

[25] B.N. Alajmi, K.H. Ahmed, G.P. Adam, S.J. Finney, and B.W. Williams, ‘Modular multilevel inverter with maximum power point tracking for grid connected photovoltaic application’, IEEE International Symposium on Industrial Electronics (ISIE) June 2011, pp. 2057 – 2062.

[26] G.P. Adam, B.N. Alajmi, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘New flying capacitor multilevel converter’, IEEE International Symposium on Industrial Electronics (ISIE) June 2011, pp. 335 – 339.

[27] S.A. Azmi, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Comparative Analysis between Voltage and Current Source Inverters in Grid-Connected Application’, IET Renewable Power Generation Conference, Sep. 2011.

[28] K.H. Ahmed, M.S. Hamad, and B.W. Williams, ‘Selective Harmonic Filtering of Medium Voltage Six-pulse Line Commutated Rectifier by Using an Adaptive Active Power Filter’, 37th Annual Conference of the IEEE Industrial Electronics Society (IECON), Nov. 2011, pp.   943 – 948.

[29] A.A. Aboushady, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘State feedback linearized model for phase-controlled series-parallel resonant converters’, 37th Annual Conference of the IEEE Industrial Electronics Society (IECON), Nov. 2011, pp. 1590 – 1595.

[30] M.A. Roslan, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Voltage Synchronization Scheme Based on Zero Crossing Detection for Parallel Connected Inverters in AC Microgrids’, IEEE International Symposium on Industrial Electronics (ISIE) June 2012, pp. 588 – 593.

[31] K.H. Ahmed, A.S. Abdel-Khalik, A. ELserougi, A. Massoud, and S. Ahmed, ‘Fault Ride-through Capability Enhancement Based on Flywheel Energy Storage System for Wind Farms Connected via VSC High Voltage DC Transmission’, 10th IET International ACDC Power Transmission Conference, 2012 , pp. 1- 6.

[32] A.A. Aboushady, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Steady State Analysis of Phase-Controlled LCC-Type Series-Parallel Resonant Converter Operating Above Resonance’, Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 2013, pp. 2125- 2131.

[33] A.A. Aboushady, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Predictive Voltage Control of Phase-Controlled Series-Parallel Resonant Converter’, IEEE Powereng conference, May 2013.

[34] M.S. Hamad, K.H. Ahmed, and A. Fahmy ‘Multifunctional DC-link Capacitor Midpoint Inverter Control of a Distributed Generation Grid Connected System’, IEEE Powereng conference, May 2013.

[35] G.P. Adam, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Generalized Modeling of DC Grid for Stability Studies’, IEEE Powereng conference, May 2013.

[36] G.P. Adam, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Generalized Modular multilevel converter modeling for power system studies’, IEEE Powereng conference, May 2013.

[37] M.I. Rahman, D. Jovcic and K.H. Ahmed ‘Reactive Current Optimisation for High Power Dual Active Bridge DC/DC Converter’, IEEE PowerTech conference, June 2013.

[38] R.A. Ibrahim, M.S. Hamad, K.H. Ahmed, Y.G. Dessouky, B.W. Williams, ‘Improved ride-through of PMSG wind turbine during symmetrical voltage dip using a magnetic amplifier’, IET Renewable Power Generation Conference, September 2013.

[39] K.H. Ahmed, ‘A State of the Art Review of Control Techniques for Power Electronics Converter Based Distributed Generation Systems in Different Modes of Operation’, IEEE ICRERA conference, October 2013.

[40] E. El Hawatt, M.S. Hamad, K.H. Ahmed, and I.F. El Arabawy ‘Low Voltage Ride-Through Capability Enhancement of a DFIG Wind Turbine Using a Dynamic Voltage Restorer with Adaptive Fuzzy PI Controller’, IEEE ICRERA conference, October 2013.

[41] G.P. Adam, K.H. Ahmed, and B.W. Williams, ‘Hybrid Multilevel Converter with dc Side H-Bridge Chain Links’, IEEE ICRERA conference, October 2013.

[42] A.A. Aboushady, K.H. Ahmed, S.J. Finney, and B.W. Williams, ‘Compact Multi-Modular Design of High Power DC/DC Resonant Converters for Offshore Wind Energy HVDC Transmission’, IEEE IECON conference, November 2013.

[43] M.S. Hamad, M.I. Masoud, K.H. Ahmed, and B.W. Williams ‘Medium Voltage 6-pulse Current Source Rectifier with a Novel Shunt Active Power Filter Connection’, IEEE IECON conference, November 2013.

[44] A. Fahmy, K.H. Ahmed, M.S. Hamad, and G.P. Adam, ‘Single-Phase Grid Connected Distributed Generation Interfacing Converter with Power Quality Improvement Capability’, IEEE IECON conference, November 2013.

[45] K.H. Ahmed, and G.P. Adam, ‘New Modified Staircase Modulation and Capacitor Balancing Strategy of 21-level Modular Multilevel Converter for HVDC Applications’, accepted for publication IEEE/IET PEMD conference, April 2014.

[46] Y. Harrye, A.A. Aboushady, and K.H. Ahmed, ‘Comprehensive Steady State Analysis of Bidirectional Dual Active Bridge DC/DC Converter Using Triple Phase Shift Control’, accepted for publication IEEE ISIE conference, June 2014.

[47] G.P. Adam, B.W. Williams, and K.H. Ahmed, ‘New Mixed cells modular multilevel converter’, IEEE ISIE conference, June 2014.

[48] Y. Harrye, A.A. Aboushady, and K.H. Ahmed, ‘Reactive Power Minimization of Dual Active Bridge DC/DC Converter with Triple Phase Shift Control using Neural Network’, accepted for publication IEEE ICRERA conference, October 2014.

[49] A.A. Aboushady, and K.H. Ahmed, ‘Sensorless Multi-loop Control of Phase-Controlled Series-Parallel Resonant Converter’, accepted for publication IEEE ICRERA conference, October 2014.

[50] A.M. Omran, K.H. Ahmed, M.S. Hamad, and I.F. El Arabawy, ‘Interconnection Between Different DC Technologies at Multi-Terminal HVDC Network’, accepted for publication IEEE ICRERA conference, October 2014.

[51] K.H. Ahmed, and A.A. Aboushady, ‘Modified Half-bridge Modular Multilevel Converter for HVDC Systems with DC Fault Ride-Through Capability’, accepted for publication IEEE IECON conference, Nov. 2014.

[52] A.A. Aboushady, K.H. Ahmed, and D. Jovcic, ‘Analysis and hardware testing of cell capacitor discharge currents during DC faults in half-bridge modular multilevel converters’, accepted for publication IEEE/IET AC/DC conference, Feb. 2015.

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