The isolated direct ac–ac converter has the advantages of high power density and long life time, however, suffering from the high cost and relatively low efficiency. In this article, a three-level isolated direct resonant ac–ac converter is proposed; thus, the voltage stress of power switches reduces to half of the input voltage amplitude, and as a result, the voltage rating of the power switches is reduced. A hybrid modulation strategy for the proposed converter is proposed to realize the ac–ac conversion and reduce the switching power loss. Furthermore, in order to obtain a good control of the output voltage based on the proposed converter, the closed-loop control strategy of the output voltage combining a linear controller with the repetitive controller (RC) is proposed and the detailed parameters design rule is discussed. The proposed control strategy not only realizes the sinusoidal output voltage waveforms and good dynamic performance but also effectively eliminates the effect of input voltage harmonics. The corresponding proposed topology, modulation, and closed-loop control strategy are all verified by the detailed experimental results.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Three-Level Isolated Direct AC–AC Converter and its Closed-Loop Control Strategy


    Contributors:
    Wu, Fengjiang (author) / Wei, Yuchen (author) / Su, Jianyong (author)


    Publication date :

    2023-09-01


    Size :

    2052715 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Modeling and Closed-Loop Control of Three-Port Isolated Current-Fed Resonant DC–DC Converter

    Wu, Fengjiang / Liu, Wenkai / Wang, Kaixuan et al. | IEEE | 2023




    Direct data–driven strategy for closed-loop aircraft flutter test

    Jianhong, Wang / Ramirez-Mendoza, Ricardo A. | Emerald Group Publishing | 2023


    Diesel Combustion Control with Closed-Loop Control of the Injection Strategy

    Tomazic, Dean / Tatur, Marek / Lamping, Matthias et al. | SAE Technical Papers | 2008