تصفح حسب المؤلف "Gowaid, I. A."
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A DC autotransformer design for medium and high voltage DC transmission systems
Gowaid I.A.; Adam G.P.; Williams B.W.; Massoud A.M.; Ahmed S. ( Institute of Electrical and Electronics Engineers Inc. , 2018 , Conference Paper)This paper studies a dc-dc converter topology dual to the ac autotransformer for medium and high voltage dc-dc conversion. Operation with trapezoidal modulation is analyzed where the dc autotransformer is built of ... -
A novel open-stator-winding DFIM flywheel architecture for renewable energy applications
Gowaid, I.,A.; Elserougi, A.; Abdel-Khalik, A.S.; Massoud, Ahmed; Ahmed, S. ( IEEE , 2013 , Conference Paper)Energy storage is becoming a basic component of modern renewable power plants, especially wind farms. For several considerations, local wind turbine (WT) energy storage is preferred. Flywheel energy storage is among the ... -
Hybrid and modular multilevel converter designs for isolated HVDC-DC converters
Gowaid I.A.; Adam G.P.; Massoud A.M.; Ahmed S.; Williams B.W. ( Institute of Electrical and Electronics Engineers Inc. , 2018 , Article)Efficient medium and high-voltage dc-dc conversion is critical for future dc grids. This paper proposes a hybrid multilevel dc-ac converter structure that is used as the kernel of dc-dc conversion systems. Operation of the ... -
Modular multilevel structure of a high power dual active bridge DC transformer with stepped two-level output
Gowaid, I.A.; Adam, G.P.; Massoud, Ahmed; Ahmed, S.; Holliday, D.; Williams, B.W.... more authors ... less authors ( Institute of Electrical and Electronics Engineers Inc. , 2014 , Conference Paper)This paper addresses the issues of dc voltage matching and dc fault protection in potential super-grids. An approach for high power dc-dc conversion is proposed and analyzed. A front-to-front connection of modular-multilevel ... -
Quasi two-level operation of modular multilevel converter for use in a high-power DC transformer with DC fault isolation capability
Gowaid, I. A.; Adam, G. P.; Massoud, Ahmed; Ahmed, S.; Holliday, D.; Williams, B. W.... more authors ... less authors ( Institute of Electrical and Electronics Engineers Inc. , 2015 , Article)DC fault protection is one challenge impeding the development of multiterminal dc grids. The absence of manufacturing and operational standards has led to many point-to-point HVDC links built at different voltage levels, ... -
Ride-through capability of grid-connected brushless cascade DFIG wind turbines in faulty grid conditions-A comparative study
Gowaid, I. A.; Abdel-Khalik, A. S.; Massoud, Ahmed; Ahmed, S. ( IEEE , 2013 , Article)Doubly-fed induction generator (DFIG)-based wind turbines (WTs) are reported to suffer reliability problems due to the presence of slip-rings, brushes, and the gearbox. These disadvantages encouraged several research groups ... -
Symmetrical Nine-Phase Drives with a Single Neutral-Point: Common-Mode Voltage Analysis and Reduction
Dabour, Sherif M.; Aboushady, Ahmed A.; Elgenedy, Mohamed A.; Gowaid, I. A.; Farrag, Mohamed Emad; Abdel-Khalik, Ayman S.; Massoud, Ahmed M.; Ahmed, Shehab... more authors ... less authors ( MDPI , 2022 , Article)Power converters generate switching common mode voltage (CMV) through the pulse width modulation (PWM). Several problems occur in the drive systems due to the generated CMV. These problems can be dangerous to the insulation ... -
The transition arm multilevel converter - A concept for medium and high voltage DC-DC transformers
Gowaid, I.A.; Adam, G.P.; Williams, B.W.; Massoud, Ahmed; Ahmed, S. ( Institute of Electrical and Electronics Engineers Inc. , 2015 , Conference Paper)This paper proposes a dc/ac converter topology where each phase leg comprises a conventional series switch valve in one arm and a series connection of half-bridge chopper cells in the other arm. Operation with trapezoidal ...