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


Komurcugil H., Bayhan S., Bagheri F., Kukrer O., Abu-Rub H.

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, vol.65, no.10, pp.8277-8286, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 65 Issue: 10
  • Publication Date: 2018
  • Doi Number: 10.1109/tie.2018.2801778
  • Journal Name: IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.8277-8286
  • Keywords: Active damping, dc-side current ripple, grid-tied quasi-Z-source inverter (qZSI), LCL filter, proportional-resonant (PR) control, PHOTOVOLTAIC POWER-SYSTEM, LCL-FILTER, CONNECTED INVERTER, CONTROL STRATEGY, CURRENT-FEEDBACK, CONVERTERS, DESIGN, VSI
  • Gazi University Affiliated: Yes

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 with an 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 causes 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, in order 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.