• 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 ...
    • 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 ...