DocumentCode :
708353
Title :
A crossed pack-to-cell equalizer based on quasi-resonant LC converter with adaptive fuzzy logic equalization control for series-connected lithium-ion battery strings
Author :
Yunlong Shang ; Chenghui Zhang ; Naxin Cui ; Guerrero, Josep M. ; Kai Sun
Author_Institution :
Sch. of Control Sci. & Eng., Shandong Univ., Jinan, China
fYear :
2015
fDate :
15-19 March 2015
Firstpage :
1685
Lastpage :
1692
Abstract :
The equalization speed, efficiency, and control are the key issues of battery equalization. This paper proposes a crossed pack-to-cell equalizer based on quasi-resonant LC converter (QRLCC). The battery string is divided into M modules, and each module consists of N series-connected cells. The energy can be transferred directly from a battery module to the lowest voltage cell (LVC) in the next adjacent module, which results in an enhancement of equalization efficiency and current. The QRLCC is employed to gain zero-current switching (ZCS), leading to a reduction of power losses and electromagnetic interference (EMI). Furthermore, an adaptive fuzzy logic control (AFLC) algorithm is employed to online regulate the equalization period according to the voltage difference between cells and the cell voltage, not only greatly abbreviating the balancing time but also effectively preventing over-equalization. A prototype with eight lithium-ion battery cells is implemented. Experimental results show the proposed scheme exhibits outstanding balancing performance, and the equalization efficiency is higher than 98%. The proposed AFLC algorithm abridges the total equalization time about 47%, and reduces the switching cycle about 62% compared with the traditional fuzzy logic control (FLC) algorithm.
Keywords :
adaptive control; fuzzy control; resonant power convertors; secondary cells; zero current switching; AFLC algorithm; EMI; LVC; QRLCC; ZCS; adaptive fuzzy logic equalization control; battery module; crossed pack-to-cell equalizer; electromagnetic interference; lithium-ion battery cells; lowest voltage cell; power losses reduction; quasi-resonant LC converter; series-connected lithium-ion battery strings; voltage difference; zero-current switching; Adaptive equalizers; Batteries; Fuzzy logic; System-on-chip; Voltage control; Zero current switching; Equalizers; adaptive fuzzy logic control (AFLC); electric vehicles (EVs); lithium-ion batteries; plug in hybrid electric vehicles (PHEVs); zero-current switching (ZCS);
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2015 IEEE
Conference_Location :
Charlotte, NC
Type :
conf
DOI :
10.1109/APEC.2015.7104574
Filename :
7104574
Link To Document :
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