基于荷电状态改进下垂控制的直流微网储能系统  

DC microgrid energy storage system based on state-of-charge improved droop control

作　　者：冯菲玥 迟长春[1] FENG Feiyue;CHI Changchun(School of Electrical Engineering,Shanghai Dianji University,Shanghai 201306,China)

机构地区：[1]上海电机学院电气学院,上海201306

出　　处：《上海电机学院学报》2021年第6期325-331,共7页Journal of Shanghai Dianji University

摘　　要：下垂控制是一种广泛运用于直流微网储能系统的控制手段,能够分配负荷电流、维持母线电压。在负载功率发生变化时,运用传统下垂控制对蓄电池变换器进行操作,会带来荷电状态(SOC)不均衡、电压偏离给定值等问题。针对以上缺陷提出了一种基于蓄电池SOC改进的下垂控制,根据蓄电池SOC变化实时调整下垂系数,SOC过大的蓄电池组多放少充、SOC过小的蓄电池组多充少放,实现输出电流的均分。在此基础上针对电压波动问题增加二次电压控制,进一步改善波形的生成,仿真验证了改进后的下垂控制的有效性。Droop control is a control method widely used in direct current(DC)microgrid energy storage systems,which can distribute load current and maintain bus voltage.When the load power changes,the use of traditional droop control to continue to operate the battery converter will cause problems such as state-of-charge(SOC)imbalance and voltage deviation from a given value.Due to these shortcomings,a droop control based on the improvement of battery SOC is proposed.The droop coefficient is adjusted in real-time according to the change of the battery SOC,so that the battery pack with very high SOC can be charged less and discharged more and the battery pack with too low SOC can be charged more and discharged less to realize equal distribution of the output current.On this basis,the secondary voltage control is added to solve the problem of voltage fluctuations to further improve the generation of waveforms.The simulation shows the effectiveness of the improved droop control.

关 键 词：改进下垂控制 蓄电池荷电状态(SOC) 二次电压控制 储能系统 

分 类 号：TM712[电气工程—电力系统及自动化]