电池荷电状态(state of charge,SOC)的准确估计是电动汽车合理实施电池管理的前提条件和重要依据。针对目前电动汽车对动力电池SOC估计精度的不断提高这一问题,利用联合估计法对锂电池SOC进行研究。基于Thevenin电池模型与修正的安时积...电池荷电状态(state of charge,SOC)的准确估计是电动汽车合理实施电池管理的前提条件和重要依据。针对目前电动汽车对动力电池SOC估计精度的不断提高这一问题,利用联合估计法对锂电池SOC进行研究。基于Thevenin电池模型与修正的安时积分算法,推导出了锂电池的输出方程以及状态空间模型,通过采集实验过程中的相关数据并应用递推最小二乘法对电池模型参数作出辨识。分析了扩展卡尔曼滤波(EKF)算法以及自适应BP神经网络算法的原理,联合两种算法并在此基础上提出了自适应BP-EKF算法(ABP-EKF)。运用所提出的算法对锂离子电池SOC进行联合估计,最后通过对比ABP-EKF与EKF两种算法估计锂电池SOC的数据,研究结果表明:所提出ABP-EKF算法相比于EKF算法在均值误差项与均方根误差项分别减少了3.9%和3.79%。展开更多
Firstly, the early warning index system of coal mine safety production was given from four aspects as per- sonnel, environment, equipment and management. Then, improvement measures which are additional momentum method...Firstly, the early warning index system of coal mine safety production was given from four aspects as per- sonnel, environment, equipment and management. Then, improvement measures which are additional momentum method, adaptive learning rate, particle swarm optimization algorithm, variable weight method and asynchronous learning factor, are used to optimize BP neural network models. Further, the models are applied to a comparative study on coal mine safety warning instance. Results show that the identification precision of MPSO-BP network model is higher than GBP and PSO-BP model, and MPSO- BP model can not only effectively reduce the possibility of the network falling into a local minimum point, but also has fast convergence and high precision, which will provide the scientific basis for the forewarnin~ management of coal mine safetv production.展开更多
文摘电池荷电状态(state of charge,SOC)的准确估计是电动汽车合理实施电池管理的前提条件和重要依据。针对目前电动汽车对动力电池SOC估计精度的不断提高这一问题,利用联合估计法对锂电池SOC进行研究。基于Thevenin电池模型与修正的安时积分算法,推导出了锂电池的输出方程以及状态空间模型,通过采集实验过程中的相关数据并应用递推最小二乘法对电池模型参数作出辨识。分析了扩展卡尔曼滤波(EKF)算法以及自适应BP神经网络算法的原理,联合两种算法并在此基础上提出了自适应BP-EKF算法(ABP-EKF)。运用所提出的算法对锂离子电池SOC进行联合估计,最后通过对比ABP-EKF与EKF两种算法估计锂电池SOC的数据,研究结果表明:所提出ABP-EKF算法相比于EKF算法在均值误差项与均方根误差项分别减少了3.9%和3.79%。
文摘Firstly, the early warning index system of coal mine safety production was given from four aspects as per- sonnel, environment, equipment and management. Then, improvement measures which are additional momentum method, adaptive learning rate, particle swarm optimization algorithm, variable weight method and asynchronous learning factor, are used to optimize BP neural network models. Further, the models are applied to a comparative study on coal mine safety warning instance. Results show that the identification precision of MPSO-BP network model is higher than GBP and PSO-BP model, and MPSO- BP model can not only effectively reduce the possibility of the network falling into a local minimum point, but also has fast convergence and high precision, which will provide the scientific basis for the forewarnin~ management of coal mine safetv production.
