TY - JOUR
T1 - Model-Based Current Control for Single-Phase Grid-Tied Quasi-Z-Source Inverters with Virtual Time Constant
AU - Komurcugil, Hasan
AU - Bayhan, Sertac
AU - Bagheri, Farzaneh
AU - Kukrer, Osman
AU - Abu-Rub, Haitham
N1 - Publisher Copyright:
© 1982-2012 IEEE.
PY - 2018/10
Y1 - 2018/10
N2 - 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.
AB - 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.
KW - Active damping
KW - LCL filter
KW - dc-side current ripple
KW - grid-tied quasi-Z-source inverter (qZSI)
KW - proportional-resonant (PR) control
UR - http://www.scopus.com/inward/record.url?scp=85041693167&partnerID=8YFLogxK
U2 - 10.1109/TIE.2018.2801778
DO - 10.1109/TIE.2018.2801778
M3 - Article
AN - SCOPUS:85041693167
SN - 0278-0046
VL - 65
SP - 8277
EP - 8286
JO - IEEE Transactions on Industrial Electronics
JF - IEEE Transactions on Industrial Electronics
IS - 10
ER -