Model-Based Current Control for Single-Phase Grid-Tied Quasi-Z-Source Inverters with Virtual Time Constant

Hasan Komurcugil, Sertac Bayhan, Farzaneh Bagheri, Osman Kukrer, Haitham Abu-Rub

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

In this paper, a model-based current control (MBCC) approach with a compensating of dc-side inductor current ripple, active damping, and virtual time constant is proposed for single-phase grid-tied quasi-Z-source inverters (qZSIs) with LCL filter. The idea behind the ripple compensation is based on the inherent relationship between the ripple components of the dc-side inductor and capacitor voltages. It is shown that dc-side inductor current ripple can be compensated if the conventional simple boost control involving proportional-integral (PI) controllers is modified by subtracting the measured dc-side inductor voltage from the error signal of the first PI controller. Also, it is shown that the proposed MBCC enforces the ac-side inverter current to track its reference in all circumstances. In addition, a virtual time constant is added to the control variable so that the dynamics of the ac-side inverter current can be adjusted as desired. Finally, to damp the LCL resonance, an active damping method is employed in the closed-loop system by modifying the ac-side reference inverter current. Experimental results are presented to show the validity and performance of the proposed control approach.

Original languageEnglish
JournalIEEE Transactions on Industrial Electronics
DOIs
Publication statusAccepted/In press - 2 Feb 2018

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Keywords

  • Active damping
  • Capacitors
  • Damping
  • dc-side current ripple
  • grid-tied qZSI
  • Inductors
  • Inverters
  • LCL filter
  • Mathematical model
  • proportional-resonant control
  • Switches
  • Voltage control

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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