TY - JOUR
T1 - Real-Time Calculation Method for Single-Phase Cascaded H-Bridge Inverters Based on Phase-Shifted Carrier Pulsewidth Modulation
AU - Ma, Junpeng
AU - Wang, Xiongfei
AU - Blaabjerg, Frede
AU - Song, Wensheng
AU - Wang, Shunliang
AU - Liu, Tianqi
PY - 2020/1
Y1 - 2020/1
N2 - The time delay caused by the digital computation and the update of the duty cycle tend to worsen the dynamic performance of digitally controlled power converters. This paper proposes a real-time calculation method for single-phase cascaded H-bridge (CHB) inverters with the phase-shifted carrier pulsewidth modulation (PSC-PWM) to eliminate the time delay caused by the digital computation in the control loop without the loss of duty cycle. In the approach, a sampling method for the PSC-PWM applied in a single-phase CHB inverter is introduced, which samples the current and voltage at points of the intersection for triangular carriers of legs in all adjacent H-bridge cells. The sampling method is used alternately with the conventional regular sampling method by following a selection rule in order to avoid the loss of duty cycle. Experimental results verify that the proposed method effectively improves the transient performance of the current control loop and suppresses the effect of the distortion of the grid voltage on the line current.
AB - The time delay caused by the digital computation and the update of the duty cycle tend to worsen the dynamic performance of digitally controlled power converters. This paper proposes a real-time calculation method for single-phase cascaded H-bridge (CHB) inverters with the phase-shifted carrier pulsewidth modulation (PSC-PWM) to eliminate the time delay caused by the digital computation in the control loop without the loss of duty cycle. In the approach, a sampling method for the PSC-PWM applied in a single-phase CHB inverter is introduced, which samples the current and voltage at points of the intersection for triangular carriers of legs in all adjacent H-bridge cells. The sampling method is used alternately with the conventional regular sampling method by following a selection rule in order to avoid the loss of duty cycle. Experimental results verify that the proposed method effectively improves the transient performance of the current control loop and suppresses the effect of the distortion of the grid voltage on the line current.
KW - Dynamic performance
KW - multilevel inverter
KW - multisampling method
KW - phase-shifted carrier pulsewidth modulation (PSC-PWM)
KW - real-time calculation
UR - http://www.scopus.com/inward/record.url?scp=85074193418&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2019.2911422
DO - 10.1109/TPEL.2019.2911422
M3 - Journal article
AN - SCOPUS:85074193418
SN - 0885-8993
VL - 35
SP - 977
EP - 987
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 1
M1 - 8691775
ER -