TY - JOUR
T1 - Multisampling Method for Single-Phase Grid-Connected Cascaded H-Bridge Inverters
AU - Ma, Junpeng
AU - Wang, Xiongfei
AU - Blaabjerg, Frede
AU - Song, Wensheng
AU - Wang, Shunliang
AU - Liu, Tianqi
PY - 2020/10
Y1 - 2020/10
N2 - This article proposes a multisampling method for single-phase grid-connected cascaded H-bridge (CHB) multilevel inverters with the phase-shifted carrier pulsewidth modulation in order to reduce the time delay involved in the control loop and increase the control bandwidth. In this method, the controlled variables are sampled not only at the peak and the valley of all triangular carriers, but also at the intersection points of all phase-shifted carriers and inverted ones, which enables a minimum unity sampling interval without detecting the current ripple caused by the switching action and breaking the voltage-second balance in the modulation process. The bandwidth of the current control loop based on the proposed sampling method is illustrated and compared to other traditional sampling methods. The analysis shows that the system effectively reduces the time delay involved in the control loop and improves the bandwidth of the control loop. Finally, a downscale test platform of the single-phase grid-connected CHB multilevel inverter with an inductance ( L )-filter is built to verify the effectiveness of the proposed method.
AB - This article proposes a multisampling method for single-phase grid-connected cascaded H-bridge (CHB) multilevel inverters with the phase-shifted carrier pulsewidth modulation in order to reduce the time delay involved in the control loop and increase the control bandwidth. In this method, the controlled variables are sampled not only at the peak and the valley of all triangular carriers, but also at the intersection points of all phase-shifted carriers and inverted ones, which enables a minimum unity sampling interval without detecting the current ripple caused by the switching action and breaking the voltage-second balance in the modulation process. The bandwidth of the current control loop based on the proposed sampling method is illustrated and compared to other traditional sampling methods. The analysis shows that the system effectively reduces the time delay involved in the control loop and improves the bandwidth of the control loop. Finally, a downscale test platform of the single-phase grid-connected CHB multilevel inverter with an inductance ( L )-filter is built to verify the effectiveness of the proposed method.
KW - Bandwidth
KW - Multilevel Converter
KW - multisampling method
KW - Phase-shifted carrier
KW - pulsewidth modulator
UR - http://www.scopus.com/inward/record.url?scp=85082515914&partnerID=8YFLogxK
U2 - 10.1109/TIE.2019.2947864
DO - 10.1109/TIE.2019.2947864
M3 - Journal article
SN - 0278-0046
VL - 67
SP - 8322
EP - 8334
JO - IEEE Transactions on Industrial Electronics
JF - IEEE Transactions on Industrial Electronics
IS - 10
M1 - 8887502
ER -