Joint Estimation of the Electric Vehicle Power Battery State of Charge Based on the Least Squares Method and the Kalman Filter Algorithm

被引:61
作者
Guo, Xiangwei [1 ,2 ,3 ]
Kang, Longyun [1 ,2 ]
Yao, Yuan [1 ,2 ]
Huang, Zhizhen [1 ,2 ]
Li, Wenbiao [1 ,2 ]
机构
[1] S China Univ Technol, New Energy Res Ctr, Elect Power Coll, Guangzhou 510640, Guangdong, Peoples R China
[2] S China Univ Technol, Guangdong Key Lab Clean Energy Technol, Guangzhou 510640, Guangdong, Peoples R China
[3] Henan Polytech Univ, Coll Elect Engn & Automat, Jiaozuo 454000, Peoples R China
来源
ENERGIES | 2016年 / 9卷 / 02期
基金
中国国家自然科学基金;
关键词
least square method with a forgetting factor; AUKF; joint estimation; LITHIUM-ION BATTERIES; OF-CHARGE; ONLINE ESTIMATION; MODEL PARAMETERS;
D O I
10.3390/en9020100
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
An estimation of the power battery state of charge (SOC) is related to the energy management, the battery cycle life and the use cost of electric vehicles. When a lithium-ion power battery is used in an electric vehicle, the SOC displays a very strong time-dependent nonlinearity under the influence of random factors, such as the working conditions and the environment. Hence, research on estimating the SOC of a power battery for an electric vehicle is of great theoretical significance and application value. In this paper, according to the dynamic response of the power battery terminal voltage during a discharging process, the second-order RC circuit is first used as the equivalent model of the power battery. Subsequently, on the basis of this model, the least squares method (LS) with a forgetting factor and the adaptive unscented Kalman filter (AUKF) algorithm are used jointly in the estimation of the power battery SOC. Simulation experiments show that the joint estimation algorithm proposed in this paper has higher precision and convergence of the initial value error than a single AUKF algorithm.
引用
收藏
页数:16
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