Ahmad Afif Nazib
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Preferred name
Ahmad Afif Nazib
Official Name
Ahmad Afif, Nazib
Alternative Name
Nazib, Ahmad Afif
Nazib, A. A.
Nazib, Ahmad A.
Main Affiliation
Scopus Author ID
56125536300
Researcher ID
DLD-1667-2022

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  • Publication
    Phase Angle Compensation-based Highly Accurate Self-Synchronising Inverter
    ( 2020-11-29)
    Zhu, Rongwu
    ;
    Kwon Y.D.
    ;
    Liserre M.
    ;
    Ahmad Afif Nazib
    ;
    Holmes D.G.
    ;
    McGrath B.
    Grid voltage measurement-based phase-locked loop (PLL), is one of the most widely used synchronisation techniques for grid-interfaced inverters. However, this PLL easily propagates the harmonics from the ac grid voltage into the control loops of inverters, due to the direct voltage measurement, potentially leading to stability issues, particularly at weak grid conditions. The self-synchronising inverter can synchronise with ac grids without ac grid voltage measurement, avoiding harmonic propagation and increasing stable margin. However, due to no grid voltage measurement, the ac grid angle tracking accuracy of the self-synchronisation becomes a concern. Thus, this paper proposes an improved self-synchronising strategy, taking into account the impacts of ac filter and unbalanced three-phase ac grid voltage. The simulation results carried out in Matlab/Plecs and experimental results based on a 4kW self-synchronising inverter both clearly validate the correctness and effectiveness of the proposed solutions.
      18  3
  • Publication
    Impedance-based Stability Assessment of Self-Synchronising Power Electronics Converter
    ( 2020-11-29)
    Kwon Y.D.
    ;
    Zhu R.
    ;
    Liserre M.
    ;
    McGrath B.
    ;
    Ahmad Afif Nazib
    ;
    Holmes D.G.
    ;
    Mu P.
    Self-synchronization, which is an unconventional control framework for grid-tied power electronics converters (PECs), uses the internal signals of current regulators instead of direct measurement of ac grid voltages, to obtain ac grid phase information and synchronization with the ac grid. Consequently, the self-synchronization provides various benefits including immunity to grid voltage harmonics and disturbances, and no need of ac voltage sensors. On the other hand, the different synchronization mechanism between the self-synchronization and conventional grid voltage measurement-based synchronization, leads to different harmonic interaction and coupling behaviours. Thus, the impedance-based stability criterion is used to comparatively assess the stability characteristics of the PEC based on the self-synchronization and conventional grid voltage measurement-based synchronization. The simulation and experimental results are clearly validate the effectiveness and feasibility of the theoretical analysis.
      2  19