大容量全钒液流电池均衡控制策略及仿真

Balanced Control Strategy and Simulation of Large Capacity All Vanadium Redox Flow Battery

随着新能源规模日益扩大,具有大容量、大功率、绿色环保特点,且适用于大容量储能系统的全钒液流电池(VRB)备受关注。对于大容量储能系统,单体电池的串并联使用非常普遍。由于电池不一致性,影响电池充放电特性和寿命。采用二级均衡控制策略实现多箱式全钒液流电池组(BL-VRB)协调均衡目标,并在Simulink仿真平台搭建多BL-VRB均衡系统,仿真验证两级均衡的可行性。同时验证两级均衡控制对双向直流变换器充放电控制影响较小。

With the increasing scale of new energy, vanadium redox batteries （VRB） has attracted more and more attention for possessing the characteristics of large capacity,large power, green and applying to large storage system.For the large storage system, the series-multiple connection of single cell is very common.The inequality of battery will affects charge-discharge characteristics and service life.Two stage equalization to realize the coordination of BL-VRB is adopted, and the coordination on Simulink simulation platform is built to verify the feasibility of two stage balance and prove its less influence on charge-discharge controlled by DC/DC converter.