TY - JOUR
T1 - New strategy for eliminating zero-sequence circulating current between parallel operating three-level NPC voltage source inverters
AU - Li, Kai
AU - Dong, Zhenhua
AU - Wang, Xiaodong
AU - Peng, Chao
AU - Deng, Fujin
AU - Guerrero, Josep
AU - Vasquez, Juan
PY - 2018/1
Y1 - 2018/1
N2 - A novel strategy based on a zero common mode voltage pulse-width modulation (ZCMV-PWM) technique and zero-sequence circulating current (ZSCC) feedback control is proposed in this study to eliminate ZSCCs between three-level neutral point clamped (NPC) voltage source inverters, with common AC and DC buses, that are operating in parallel. First, an equivalent model of ZSCC in a three-phase three-level NPC inverter paralleled system is developed. Second, on the basis of the analysis of the excitation source of ZSCCs, i.e., the difference in common mode voltages (CMVs) between paralleled inverters, the ZCMV-PWM method is presented to reduce CMVs, and a simple electric circuit is adopted to control ZSCCs and neutral point potential. Finally, simulation and experiment are conducted to illustrate effectiveness of the proposed strategy. Results show that ZSCCs between paralleled inverters can be eliminated effectively under steady and dynamic states. Moreover, the proposed strategy exhibits the advantage of not requiring carrier synchronization. It can be utilized in inverters with different types of filter.
AB - A novel strategy based on a zero common mode voltage pulse-width modulation (ZCMV-PWM) technique and zero-sequence circulating current (ZSCC) feedback control is proposed in this study to eliminate ZSCCs between three-level neutral point clamped (NPC) voltage source inverters, with common AC and DC buses, that are operating in parallel. First, an equivalent model of ZSCC in a three-phase three-level NPC inverter paralleled system is developed. Second, on the basis of the analysis of the excitation source of ZSCCs, i.e., the difference in common mode voltages (CMVs) between paralleled inverters, the ZCMV-PWM method is presented to reduce CMVs, and a simple electric circuit is adopted to control ZSCCs and neutral point potential. Finally, simulation and experiment are conducted to illustrate effectiveness of the proposed strategy. Results show that ZSCCs between paralleled inverters can be eliminated effectively under steady and dynamic states. Moreover, the proposed strategy exhibits the advantage of not requiring carrier synchronization. It can be utilized in inverters with different types of filter.
KW - Common mode voltage
KW - Neural point potential
KW - Neutral point clamped
KW - Voltage source inverter
KW - Zero sequence circulating current
UR - http://www.scopus.com/inward/record.url?scp=85040821976&partnerID=8YFLogxK
U2 - 10.6113/JPE.2018.18.1.70
DO - 10.6113/JPE.2018.18.1.70
M3 - Journal article
AN - SCOPUS:85040821976
SN - 1598-2092
VL - 18
SP - 70
EP - 80
JO - Journal of Power Electronics
JF - Journal of Power Electronics
IS - 1
ER -