为提升锂电池荷电状态(state of charge,SOC)估计的精度,以二阶RC分数阶模型为研究对象,提出一种由分数阶无迹卡尔曼滤波算法和带可变遗忘因子最小二乘法组成的FOUKF+VFFRLS算法。其中分数阶无迹卡尔曼滤波算法用于锂离子电池荷电状态估...为提升锂电池荷电状态(state of charge,SOC)估计的精度,以二阶RC分数阶模型为研究对象,提出一种由分数阶无迹卡尔曼滤波算法和带可变遗忘因子最小二乘法组成的FOUKF+VFFRLS算法。其中分数阶无迹卡尔曼滤波算法用于锂离子电池荷电状态估计,带可变遗忘因子最小二乘法用于电池参数估计。该算法通过对状态变量和参数变量的递推估算,确保了电池状态和参数的实时更新。基于UDDS工况下的实验数据进行仿真分析,结果表明,该方法较FOUKF等算法具有更高的估计精度,电池SOC最大估计误差可控制在2%以内,验证了所提方法的正确性及有效性。展开更多
Modeling and state of charge （SOC） estimation of lithium-ion （Li-ion） battery are the key techniques of battery pack management system （BMS） and critical to its reliability and safety operation. An auto-regressi...Modeling and state of charge （SOC） estimation of lithium-ion （Li-ion） battery are the key techniques of battery pack management system （BMS） and critical to its reliability and safety operation. An auto-regressive with exogenous input （ARX） model is derived from RC equivalent circuit model （ECM） due to the discrete-time characteristics of BMS. For the time-varying environmental factors and the actual battery operating conditions, a variable forgetting factor recursive least square （VFFRLS） algorithm is adopted as an adaptive parameter identifica- tion method. Based on the designed model, an SOC estimator using cubature Kalman filter （CKF） algorithm is then employed to improve estimation performance and guarantee numerical stability in the computational procedure. In the battery tests, experimental results show that CKF SOC estimator has a more accuracy estimation than extended Kalman filter （EKF） algorithm, which is widely used for Li-ion battery SOC estimation, and the maximum estimation error is about 2.3%.展开更多
文摘为提升锂电池荷电状态(state of charge,SOC)估计的精度,以二阶RC分数阶模型为研究对象,提出一种由分数阶无迹卡尔曼滤波算法和带可变遗忘因子最小二乘法组成的FOUKF+VFFRLS算法。其中分数阶无迹卡尔曼滤波算法用于锂离子电池荷电状态估计,带可变遗忘因子最小二乘法用于电池参数估计。该算法通过对状态变量和参数变量的递推估算,确保了电池状态和参数的实时更新。基于UDDS工况下的实验数据进行仿真分析,结果表明,该方法较FOUKF等算法具有更高的估计精度,电池SOC最大估计误差可控制在2%以内,验证了所提方法的正确性及有效性。
基金supported by the National High Technology Research and Development of China 863 Program(Grant No. 2011AA11A247)
文摘Modeling and state of charge （SOC） estimation of lithium-ion （Li-ion） battery are the key techniques of battery pack management system （BMS） and critical to its reliability and safety operation. An auto-regressive with exogenous input （ARX） model is derived from RC equivalent circuit model （ECM） due to the discrete-time characteristics of BMS. For the time-varying environmental factors and the actual battery operating conditions, a variable forgetting factor recursive least square （VFFRLS） algorithm is adopted as an adaptive parameter identifica- tion method. Based on the designed model, an SOC estimator using cubature Kalman filter （CKF） algorithm is then employed to improve estimation performance and guarantee numerical stability in the computational procedure. In the battery tests, experimental results show that CKF SOC estimator has a more accuracy estimation than extended Kalman filter （EKF） algorithm, which is widely used for Li-ion battery SOC estimation, and the maximum estimation error is about 2.3%.
