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

Ghoshal, Anirban and John, Vinod (2015) A controller design method for 3 phase 4 wire grid connected VSI with LCL filter. In: SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES, 40 (5). pp. 1481-1499.

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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.

Item Type:	Journal Article
Publication:	SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES
Publisher:	INDIAN ACAD SCIENCES
Additional Information:	Copy right for this article belongs to the INDIAN ACAD SCIENCES, C V RAMAN AVENUE, SADASHIVANAGAR, P B #8005, BANGALORE 560 080, INDIA
Keywords:	Grid connected VSI; PR controller; current control; DC bus voltage control
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	19 Nov 2015 04:56
Last Modified:	19 Nov 2015 04:56
URI:	http://eprints.iisc.ac.in/id/eprint/52780

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