英国工程技术协会
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作者:A.A. Aboushady , K.H. Ahmed , D. Jovcic
来源:[C].11th IET International Conference on AC and DC Power Transmission2015IET
摘要:This paper focuses on the behaviour of the cell capacitor discharge currents during DC faults in half-bridge modular multilevel converters. Active switches, not designed for fault conditions, are tripped to minimize discharge currents effect on the semiconductor switches. Two lev...
作者:K.H. Ahmed , A.S. Abdel-Khalik ...
来源:[C].10th IET International Conference on AC and DC Power Transmission (ACDC 2012)2012IET
摘要:This paper proposes a recovery strategy for wind energy-fed voltage source converter high voltage DC transmission systems, capable of maintaining power balance between the AC and DC sides during different AC faults. This prevents the DC link voltage rise as a result of trapped en...
作者:K.H. Ahmed , G.P. Adam
来源:[C].7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014)2014IET
摘要:In this paper, a modified staircase modulation is proposed which enables more efficient use of the DC link voltage. This is very preferable feature for HVDC transmission systems as the 15% lower DC link voltage can be used (lower number of cells). In the second part of the paper ...
作者:K.H. Ahmed , Y.G. Dessouky
来源:[C].2nd IET Renewable Power Generation Conference (RPG 2013)2013IET
摘要:Direct-drive wind turbines based on permanent magnet synchronous generator with full scale back to back converters are becoming very promising due to their high power density, gearless structure and flexible control. With the remarkable growth of wind energy capacity connected to...
作者:K.H. Ahmed , S.J. Finney
来源:[C].5th IET International Conference on Power Electronics, Machines and Drives (PEMD 2010)2010IET
摘要:Transformers are considered critical components that influence high power converter dynamic response, efficiency, and size. High permeability nanocrystalline cores are being increasingly utilized in designs due to their high saturation flux density, high power density, and lower ...
作者:K.H. Ahmed , S.J. Finney ...
来源:[C].5th IET International Conference on Power Electronics, Machines and Drives (PEMD 2010)2010IET
摘要:This paper proposes a new modular configuration for ac/dc conversion based on the concept of "building block" converter units. The modular system architecture comprises low-power units which can be connected in parallel to achieve higher power levels. Using such a design, medium ...
作者:K.H. Ahmed , S.J. Finney
来源:[C].IET Conference on Renewable Power Generation (RPG 2011)2011IET
摘要:The voltage source inverter is mainly used for grid interfacing of distributed generation systems. In order to boost the voltage of a renewable energy source to the required dc voltage level, a dc-dc converter is necessary even though the cost and complexity of the system are inc...
作者:K.H. Ahmed , A.M. Massoud ...
来源:[C].4th IET International Conference on Power Electronics, Machines and Drives (PEMD 2008)2008IET
摘要:Different control schemes for voltage source inverter interfacing are presented and compared. Different state feedback control approaches are investigated, therein identifying a generalized optimum control variable selection criterion that is appropriate to the control of inverte...
作者:K.H. Ahmed , A.M. Massoud ...
来源:[C].4th IET International Conference on Power Electronics, Machines and Drives (PEMD 2008)2008IET
摘要:This paper presents a modified current controller technique for three-phase inverter based grid interfaced distribution generation systems. The measurements and digital processor calculation delay is compensated by using a modified Kalman filter. For system robustness two current...
作者:K.H. Ahmed , A.M. Massoud ...
来源:[C].4th IET International Conference on Power Electronics, Machines and Drives (PEMD 2008)2008IET
摘要:A control strategy for PWM inverters in distributed generation system to operate in islanded mode is presented in this paper. The control system must provide sufficient active and reactive power to match the connected load, therein providing high power quality. The multiloop cont...

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