变调节因子的不同容量锂电池储能系统能量控制策略

Energy control strategies for lithium battery energy storage systems with different capacities based on variable regulating factors

为解决不同容量储能单元(ESUs)的荷电状态(SOC)均衡控制与功率分配问题,提出一种变调节因子的不同容量储能系统能量控制策略。通过建立引入容量因子的指数函数,实现各ESU按照其容量比分配输出功率,同时设置动态调节因子,使其随各ESU的SOC与全局SOC平均值差值的减小而增大,解决最大输出功率与均衡速度不可兼顾的问题。为减小通信压力,采用动态一致性算法获取全局平均值,并制定通信故障时的控制策略,使系统稳定运行。最后,进行Matlab/Simulink仿真研究,结果表明所提策略相较于固定调节因子SOC均衡策略具有更快的均衡速度且能实现更精准的功率分配。

To achieve state of charge(SOC)balancing control and power allocation of energy storage units(ESUs)with different capacities,an energy control strategy with variable regulation factors for energy storage systems with different capacities is proposed.By establishing an exponential function that introduces a capacity factor,each ESU allocates output power according to its capacity ratio,while setting a dynamic adjustment factor to increase as the difference between the SOC of each ESU and the global SOC average decreases,solving the problem of the imbalance between maximum output power and equilibrium speed.To reduce communication pressure,a dynamic consistency algorithm is used to obtain the global average value and develop a control strategy in case of communication failure,so that the system can operate stably.Finally,the Matlab/Simulink simulation is conducted,and the results show that the proposed strategy has faster equalization speed and more accurate power allocation compared to the fixed adjustment factor SOC equalization strategy.