TY - JOUR
T1 - A hierarchical model predictive voltage control for NPC/H-bridge converters with a reduced computational burden
AU - Gong, Zheng
AU - Dai, Peng
AU - Wu, Xiaojie
AU - Deng, Fujin
AU - Liu, Dong
AU - Chen, Zhe
PY - 2017
Y1 - 2017
N2 - In recent years, voltage source multilevel converters are very popular in medium/high-voltage industrial applications, among which the NPC/H-Bridge converter is a popular solution to the medium/high-voltage drive systems. The conventional finite control set model predictive control (FCS-MPC) strategy is not practical for multilevel converters due to their substantial calculation requirements, especially under high number of voltage levels. To solve this problem, a hierarchical model predictive voltage control (HMPVC) strategy with referring to the implementation of g-h coordinate space vector modulation (SVM) is proposed. By the hierarchical structure of different cost functions, load currents can be controlled well and common mode voltage can be maintained at low values. The proposed strategy could be easily expanded to the systems with high number of voltage levels while the amount of required calculation is significantly reduced and the advantages of the conventional FCS-MPC strategy are reserved. In addition, a HMPVC-based field oriented control scheme is applied to a drive system with the NPC/H-Bridge converter. Both steady-state and transient performances are evaluated by simulations and experiments with a down-scaled NPC/H-Bridge converter prototype under various conditions, which validate the proposed HMPVC strategy.
AB - In recent years, voltage source multilevel converters are very popular in medium/high-voltage industrial applications, among which the NPC/H-Bridge converter is a popular solution to the medium/high-voltage drive systems. The conventional finite control set model predictive control (FCS-MPC) strategy is not practical for multilevel converters due to their substantial calculation requirements, especially under high number of voltage levels. To solve this problem, a hierarchical model predictive voltage control (HMPVC) strategy with referring to the implementation of g-h coordinate space vector modulation (SVM) is proposed. By the hierarchical structure of different cost functions, load currents can be controlled well and common mode voltage can be maintained at low values. The proposed strategy could be easily expanded to the systems with high number of voltage levels while the amount of required calculation is significantly reduced and the advantages of the conventional FCS-MPC strategy are reserved. In addition, a HMPVC-based field oriented control scheme is applied to a drive system with the NPC/H-Bridge converter. Both steady-state and transient performances are evaluated by simulations and experiments with a down-scaled NPC/H-Bridge converter prototype under various conditions, which validate the proposed HMPVC strategy.
KW - Common mode voltage elimination
KW - Computational burden reduction
KW - Model predictive control (MPC)
KW - NPC/H-Bridge converter
UR - http://www.scopus.com/inward/record.url?scp=85010903609&partnerID=8YFLogxK
U2 - 10.6113/JPE.2017.17.1.136
DO - 10.6113/JPE.2017.17.1.136
M3 - Journal article
AN - SCOPUS:85010903609
SN - 1598-2092
VL - 17
SP - 136
EP - 148
JO - Journal of Power Electronics
JF - Journal of Power Electronics
IS - 1
M1 - JPE 17-1-14
ER -