• A controller design method for 3 phase 4 wire grid connected VSI with LCL filter

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    • Keywords


      Grid connected VSI; PR controller; current control; DC bus voltage control.

    • Abstract


      Closed loop control of a grid connected VSI requires line current control and dc bus voltage control. The closed loop system comprising PR current controller and grid connected VSI with LCL filter is a higher order system. Closed loop control gain expressions are therefore difficult to obtain directly for such systems. In this work a simplified approach has been adopted to find current and voltage controller gain expressions for a 3 phase 4 wire grid connected VSI with LCL filter. The closed loop system considered here utilises PR current controller in natural reference frame and PI controller for dc bus voltage control. Asymptotic frequency response plot and gain bandwidth requirements of the system have been used for current control and voltage controller design. A simplified lower order model, derived for closed loop current control, is used for the dc bus voltage controller design. The adopted design method has been verified through experiments by comparison of the time domain response.

    • Author Affiliations


      Anirban Ghoshal1 Vinod John1

      1. Department of Electrical Engineering, Indian Institute of Science, Bangalore 560012, India
    • Dates

  • Sadhana | News

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      Posted on July 25, 2019

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