Fuzzy PLL for three-level neutral point clamped active rectifiers Online publication date: Tue, 03-Nov-2015
by Hany A. Hamed; Ehab H.E. Bayoumi; E.E. EL-Kholy
International Journal of Industrial Electronics and Drives (IJIED), Vol. 2, No. 3, 2015
Abstract: This paper proposes a new design of synchronous reference frame phase locked loops-based fuzzy logic control employed for three-level medium voltage neutral-point-clamped rectifiers. Systematic methods to design the conventional PLL-based PI controller is introduced for standard order and high order models. A synchronous reference frame PLL incorporating fuzzy logic controller is established to replace the conventional PI controller. A comparative analysis is presented to examine the advantage of implementing fuzzy logic controller hostile to classical controller. Moreover, a detailed design of input filters and its influence in rectifier operation is investigated. The harmonics generated by rectifier back to grid under unbalance grid voltage due to dip is explored. Simulation results and experimental measurements of the real industrial type rectifier system validate the proposed technique and highlight its practicability.
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