TY - GEN
T1 - A design of circulating current controller for paralleled inverter with non-isolated dc-link
AU - Jung, Hyun Sam
AU - Sul, Seung Ki
N1 - Publisher Copyright:
© 2017 IEEE.
PY - 2017/7/25
Y1 - 2017/7/25
N2 - In this paper, the suppression of the circulating current flowing between inverters in parallel with non-isolated dc-link is described. If the inverters are connected in parallel through sharing inductor, circulating current would follow between inverters. In early researches, the circulating current generally is considered as zero sequence component. However, circulating current is not confined as zero sequence component, because differential current can flow by non-ideal conditions such as unbalanced impedance, different propagation delay and etc. of each inverter. In order to separate the components of the circulating current, equivalent circuits are derived from n-paralleled inverters. Based on these equivalent circuits, it is found that circulating current consists of Zero Sequence Circulating Current(ZSCC) and Differential Circulating Current(DCC). To minimize the circulating current and improve performance of total output phase current, a control scheme to suppress the circulating current is proposed from equivalent circuit models. The proposed algorithm is applied to a system consisted of 3 paralleled 2 level inverters, whose DC-links are connected. And, synchronous Pulse Width Modulation is used for PWM of each inverter. Experimental results are provided to verify the effectiveness of the proposed control scheme.
AB - In this paper, the suppression of the circulating current flowing between inverters in parallel with non-isolated dc-link is described. If the inverters are connected in parallel through sharing inductor, circulating current would follow between inverters. In early researches, the circulating current generally is considered as zero sequence component. However, circulating current is not confined as zero sequence component, because differential current can flow by non-ideal conditions such as unbalanced impedance, different propagation delay and etc. of each inverter. In order to separate the components of the circulating current, equivalent circuits are derived from n-paralleled inverters. Based on these equivalent circuits, it is found that circulating current consists of Zero Sequence Circulating Current(ZSCC) and Differential Circulating Current(DCC). To minimize the circulating current and improve performance of total output phase current, a control scheme to suppress the circulating current is proposed from equivalent circuit models. The proposed algorithm is applied to a system consisted of 3 paralleled 2 level inverters, whose DC-links are connected. And, synchronous Pulse Width Modulation is used for PWM of each inverter. Experimental results are provided to verify the effectiveness of the proposed control scheme.
KW - Circulating current
KW - Parallel operation
UR - http://www.scopus.com/inward/record.url?scp=85034116869&partnerID=8YFLogxK
U2 - 10.1109/IFEEC.2017.7992342
DO - 10.1109/IFEEC.2017.7992342
M3 - Conference contribution
AN - SCOPUS:85034116869
T3 - 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia, IFEEC - ECCE Asia 2017
SP - 1913
EP - 1919
BT - 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia, IFEEC - ECCE Asia 2017
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 3rd IEEE International Future Energy Electronics Conference and ECCE Asia, IFEEC - ECCE Asia 2017
Y2 - 3 June 2017 through 7 June 2017
ER -