基于自适应H_(∞)观测器的锂电池SOC与容量联合估计  

Joint SOC and Capacity Estimation of Lithium Battery Based on AdaptiveH_(∞)Observer

作　　者：吴忠强[1] 陈海佳 WU Zhongqiang;CHEN Haijia(Hebei Key Lab of Industrial Computer Control Eng,Yanshan University,Qinhuangdao,Hebei 066004,China)

机构地区：[1]燕山大学工业计算机控制工程河北省重点实验室,河北秦皇岛066004

出　　处：《计量学报》2024年第8期1209-1215,共7页Acta Metrologica Sinica

基　　金：河北省省级重点实验室绩效补助经费项目(22567612H)。

摘　　要：为了提高锂电池SOC的估计精度,提出了一种基于自适应H_(∞)观测器的锂电池SOC与容量联合估计方法。基于锂电池的二阶RC等效电路模型,并考虑SOC和容量的耦合关系,将容量也作为系统的状态变量进行观测。设计了一种自适应H_(∞)观测器,其参数可随锂电池状态的变化自适应调整。由于在SOC估算时考虑了容量的影响,实现了SOC和容量的同时准确估计。实验结果表明:自适应H_(∞)观测器的估计精度高且鲁棒性强,电池的SOC平均估计误差始终保持在±0.43%以内,相比于EKF和H_(∞)观测器有更高的估计精度与稳定性。In order to improve the estimation accuracy of lithium battery SOC,based on adaptive H_(∞)observer a joint estimation method of lithium battery SOC and capacity is proposed.Based on the second-order RC equivalent circuit model of lithium battery,and the coupling relationship between SOC and capacity is considered,the capacity of lithium battery is also observed as the state variable of the system.An adaptive H_(∞)observer is designed.The parameters of the observer can be adjusted adaptively with the state change of lithium battery.Since the influence of capacity is considered in SOC estimation,the adaptive H_(∞)observer can realize the simultaneous accurate estimation of SOC and capacity.The experimental results show that the adaptive H_(∞)observer has high estimation accuracy and strong robustness.The average SOC estimation error of the battery is always within 0.43%.Compared with EKF and H_(∞)observers,the adaptive H_(∞)observer has higher estimation accuracy and stability.

关 键 词：电学计量 锂电池 荷电状态 容量估计 自适应律 自适应H_(∞)观测器 联合估计 

分 类 号：TB971[一般工业技术—计量学]