基于超级电容的全钒液流电池组均衡方法

摘要

储能是提高电网对间歇性可再生能源发电接纳能力的有效技术,电池储能因其独特的性能已成为优先发展方向之一.全钒液流电池作为新型储能电池,目前得到了广泛应用.全钒液流电池串并联构成大容量储能系统时,由于电池的不一致性,在充放电过程出现过充过放影响全钒液流电池的寿命.利用超级电容作为能量载体,研究两个全钒液流电池的均衡.为提高均衡速度,分析超级电容、全钒液流电池、切换频率等参数,通过仿真对比不同参数情况下均衡速度,得出影响均衡速度因素,为全钒液流电池应用奠定了基础.%Energy storage is an effective technology to improve the acceptability of the power grid to the intermittent renewable energy.Battery energy storage has become a priority to the development direction because of its unique performance.As a new type of energy storage battery,vanadium redox flow battery has been widely used now.A large-capacity energy storage system can be composed by series-parallel connection vanadium redox flow batteries.Due to the inconsistency of the battery,the phenomenon of overcharging and overdischarging occurs during the process of charging and discharging,thus affects the service life of the Vanadium redox flow battery.The energy balance between two vanadium redox flow batteries with the super capacitor as the carrier was studied in this paper.In order to improve the equilibrium speed,considering the switching frequency,super capacitor and vanadium redox flow battery,the equilibrium speed was simulated under different parameters.The affecting factors were presented which could lay a solid foundation for vanadium redox flow battery application.