一种基于模糊控制的混合储能系统能量管理策略研究

摘要

混合储能系统中,锂离子电池循环寿命短和超级电容能量不足是制约混合储能发展的两大因素.文章提出了一种新型混合储能系统的能量管理策略,在综合考虑锂离子电池温度及荷电状态和超级电容荷电状态的基础上,通过模糊控制动态调节低通滤波器的时间常数,实现对混合储能的功率分配.在保证锂离子电池平滑输出的同时,减少了锂离子电池热量的产生;运用能量转移的方式对超级电容进行越限保护,提高超级电容在两种极端情况下的响应能力.算例分析表明,文章提出的功率分配策略和超级电容越限保护方法,可以有效地改善两种储能介质的出力.%The short cycle life of lithium-ion battery and the energy shortage of super capacitor are the two major factors that restrict the development of hybrid energy storage system (HESS). A new energy management strategy of HESS which control the time constant of low-pass filter through fuzzy control based on the temperature and SOC of lithium-ion batteries and the SOC of super capacitor is presented to achieve the power allocation of HESS in this paper. The heat generation of the lithium-ion battery is reduced while smooth output of the lithium-ion battery is ensured. To enhance the super capacitor's response capability in the two extreme situations, energy transfer was used to achieve over-limit protection for the super capacitor. The example analysis showed that the proposed power allocation strategy and the method of the over-limit protection for the super capacitor effectively improved the capacity of the two energy storage mediums.