粒子群优化神经网络在SOC估算中的应用

摘要

Since the State of Charge(SOC) of electric vehicles battery has the characters of nonlincarity concerned with multifactor, and precision forecasted is difficult to be satisfied by the common artificial neural networks. A novel battery SOC forecast modeling is established by Back Propagation(BP) neural network based on Particle Swarm Optimization(PSO) which is used to optimize the weight and threshold of neural network. For overcoming the shortcoming of PSO algorithm trapped in local optimum, chaotic variables are provided to initialize the position of particles and the algorithm is embedded to avoid massive panicles. It is proved through the simulation that the battery SOC is estimated rapidly, precisely and stably by this method.%针对电传动车辆用动力电池组荷电状态(SOC)非线性强、普通神经网络模型预测精度低的问题,提出利用粒子群优化神经网络权值和阈值的预测方法,建立基于该方法的BP神经网络电池SOC训练模型.为克服粒子群算法容易陷入局部最优的缺点,用混沌变量初始化粒子位置,采用可避免粒子高度聚集的算法,提高模型的预测精度.仿真结果表明,使用该方法估算电池的SOC更具快速性、准确性和稳定性.