A Current-Source Charging System Considering the Characteristics of Battery
Guo Qiang1, Liu Heping1, Peng Donglin2, Liu Qing1
1. State Key Laboratory of Power Transmission Equipment & System Security and New TechnologyChongqing University Chongqing 400044 China; 2. Engineering Research Center of Mechanical Testing Technology and Equipment of Ministry of Education Chongqing University of Technology Chongqing 400054 China
Abstract：A novel fast-charging strategy considering the battery inner features is developed based on a three-phase current-source rectifier (CSR), including a variable constant current control scheme and a constant voltage control scheme. Regarding the VCC mode, a second-order Thevenin equivalent circuit is used to model the dynamics of LiFePO4 battery. Subsequently, according to the experimental data, the polarization voltage curves versus the states of charge (SOC) are established at different charging currents. On this basis, the polarization voltage and its change rate are considered as the input variables of the fuzzy control algorithm, so the reference charging current in the next instant can be deduced. Then, the VCC mode is switched into the CV mode once the cut-off voltage is reached. For the two modes above, a voltage-oriented CSR indirect current control strategy is proposed, in which a delay-angle of power factor is introduced into modulation signal. By using Matlab/SISO design tool in frequency domain, the parameters of current inner-loop and voltage outer-loop controllers are optimized. Finally, simulation and experimental results verify the correctness and availability of the proposed strategy.
郭强, 刘和平, 彭东林, 刘庆. 一种考虑电池自身特性的电流源型充电系统[J]. 电工技术学报, 2016, 31(16): 16-25.
Guo Qiang, Liu Heping, Peng Donglin, Liu Qing. A Current-Source Charging System Considering the Characteristics of Battery. Transactions of China Electrotechnical Society, 2016, 31(16): 16-25.
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2016, Vol. 31 
