TY - GEN
T1 - Current Harmonic Analysis of Multisampled LCLType Grid-connected Inverter
AU - He, Shan
AU - Pan, Yiwei
AU - Zhou, Dao
AU - Wang, Xiongfei
AU - Blaabjerg, Frede
N1 - Publisher Copyright:
© 2020 IEEE.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/10/11
Y1 - 2020/10/11
N2 - Multisampling control provides an attractive way to reduce the control delays in LCL-type grid-connected inverters, and thereby the bandwidth and stability margin will be improved. However, high frequency switching harmonics is introduced in the control loop when the inverter current is selected as a feedback. In order to investigate the effect of high frequency switching harmonics, the internal relationship between double-update pulse width modulation (PWM) and four-update PWM is deduced through the geometric analysis. Compared with the double-update PWM, a sampling instant is shifted a quarter of the switching period during each switching period. Hence the non-average value is sampled and low-order aliased harmonics will appear in the grid current. Finally, the theoretical analysis is verified through the simulation and experimental results.
AB - Multisampling control provides an attractive way to reduce the control delays in LCL-type grid-connected inverters, and thereby the bandwidth and stability margin will be improved. However, high frequency switching harmonics is introduced in the control loop when the inverter current is selected as a feedback. In order to investigate the effect of high frequency switching harmonics, the internal relationship between double-update pulse width modulation (PWM) and four-update PWM is deduced through the geometric analysis. Compared with the double-update PWM, a sampling instant is shifted a quarter of the switching period during each switching period. Hence the non-average value is sampled and low-order aliased harmonics will appear in the grid current. Finally, the theoretical analysis is verified through the simulation and experimental results.
KW - aliasing
KW - low frequency distortion
KW - Multisampling
KW - sampling instant shift
UR - http://www.scopus.com/inward/record.url?scp=85097208827&partnerID=8YFLogxK
U2 - 10.1109/ECCE44975.2020.9235724
DO - 10.1109/ECCE44975.2020.9235724
M3 - Article in proceeding
AN - SCOPUS:85097208827
T3 - IEEE Energy Conversion Congress and Exposition
SP - 4329
EP - 4335
BT - ECCE 2020 - IEEE Energy Conversion Congress and Exposition
PB - IEEE Signal Processing Society
T2 - 12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020
Y2 - 11 October 2020 through 15 October 2020
ER -