TY - GEN
T1 - A modular equalizer using buck/boost converters with snubber capacitors for series-connected supercapacitors
AU - Li, Wenpeng
AU - Liao, Xiaozhong
AU - Gao, Zhigang
N1 - Publisher Copyright:
© 2016 IEEE.
PY - 2016/5/19
Y1 - 2016/5/19
N2 - The cell voltage imbalance of series-connected energy storage cells, such as supercapacitors (SCs) and batteries may hurt and even damage the whole energy storage system. Hence, the voltage balancing technology is of great significance to the development of energy storage system. The aim of this paper is to propose a new modular equalizer based on buck/boost converters with snubber capacitors for SCs. Compared with previous methods, the proposed equalizer can balance the voltage quickly and reduce the peak voltage effectively. Detail of the basic operation model was conducted, which indicating the inductance current can be limited without feedback control when operating at DCM. The design for circuit parameters was analyzed based on the model of the equalization time. The simulation results of PSIM and the analysis were in good agreement. Experimental test was performed for 16-series-connected SCs based on the proposed expanded topology. The cell voltage imbalance was gradually eliminated within finite time. In addition, when switches were turned off, the peak voltages were reduced effectively, which verified the basic model. Experimental results were analyzed to prove performance and effectiveness of extensions of equalizing module, which is convenient for application in large-scale energy storage system.
AB - The cell voltage imbalance of series-connected energy storage cells, such as supercapacitors (SCs) and batteries may hurt and even damage the whole energy storage system. Hence, the voltage balancing technology is of great significance to the development of energy storage system. The aim of this paper is to propose a new modular equalizer based on buck/boost converters with snubber capacitors for SCs. Compared with previous methods, the proposed equalizer can balance the voltage quickly and reduce the peak voltage effectively. Detail of the basic operation model was conducted, which indicating the inductance current can be limited without feedback control when operating at DCM. The design for circuit parameters was analyzed based on the model of the equalization time. The simulation results of PSIM and the analysis were in good agreement. Experimental test was performed for 16-series-connected SCs based on the proposed expanded topology. The cell voltage imbalance was gradually eliminated within finite time. In addition, when switches were turned off, the peak voltages were reduced effectively, which verified the basic model. Experimental results were analyzed to prove performance and effectiveness of extensions of equalizing module, which is convenient for application in large-scale energy storage system.
KW - DCM
KW - Energy storage system
KW - SCs
KW - buck/boost converters
KW - modular equalizer
KW - snubber
UR - http://www.scopus.com/inward/record.url?scp=84974622802&partnerID=8YFLogxK
U2 - 10.1109/ICIT.2016.7475057
DO - 10.1109/ICIT.2016.7475057
M3 - Conference contribution
AN - SCOPUS:84974622802
T3 - Proceedings of the IEEE International Conference on Industrial Technology
SP - 1904
EP - 1909
BT - Proceedings - 2016 IEEE International Conference on Industrial Technology, ICIT 2016
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - IEEE International Conference on Industrial Technology, ICIT 2016
Y2 - 14 March 2016 through 17 March 2016
ER -