A grid-connected photovoltaic (PV) power supply system with on-line voltage regulation capability is presented. It employs the three-arm rectifier-inverter topology with PV modules connected directly on the dc-link. The common-arm is with line-frequency switching and synchronous to the input voltage, aiming for a lower switching loss and decoupling the control of rectifier and inverter portions. As a result, the rectifier and inverter portions can be controlled independently with the rectifier-arm and inverter-arm, respectively. For maximum power point tracking (MPFF) of the PV modules and balancing the power among utility, PV, and the load, a variable dc-link voltage is adopted and controlled by the rectifier-arm based on the MPPT control algorithm. The inverter-arm then regulates the load voltage with good regulation and low distortion. Due to large variation of the dc-link voltage, a feedforward plus feedback control technique with variable gain is developed to keep constant bandwidth of the current loop at any operation condition. Therefore, the performance of the rectifier and inverter portions can be ensured. A system containing a 2 kVA converter and a 1.2 kW PV module is set up, and some experimental results are provided for demonstrating the effectiveness of the proposed method.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Single-phase grid-connected PV system using three-arm rectifier-inverter


    Contributors:
    Chang, J.M. (author) / Chang, W.N. (author) / Chung, S.J. (author)


    Publication date :

    2006-01-01


    Size :

    2619356 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





    Robust iterative learning control of single-phase grid-connected inverter

    Wu, Z. Q. / Xu, C. H. / Yang, Y. | British Library Online Contents | 2014



    Three-phase grid connected inverter for photovoltaic systems, a review

    Mechouma, R. / Azoui, B. / Chaabane, M. | IEEE | 2012