考虑不同容量的储能单元荷电状态均衡研究  

Research on state of charge balance of energy storage units considering different capacity

作　　者：郭昆丽[1] 付建哲 闫东 蔡维正 GUO Kunli;FU Jianzhe;YAN Dong;CAI Weizheng(School of Electronics and Information,Xi'an Polytechnic University,Xi'an Shaanxi 710048,China)

机构地区：[1]西安工程大学电子信息学院,陕西西安710048

出　　处：《电源技术》2021年第9期1202-1204,1226,共4页Chinese Journal of Power Sources

基　　金：陕西省自然科学基金项目(2019JQ-843);西安市科技局项目(GXYD7.4)。

摘　　要：随着直流微电网的快速发展,分布式储能单元(DESU)并联下垂控制技术得到了高度重视。针对直流微电网DESU下垂控制中荷电状态(SOC)均衡及负荷电流分配问题,在传统I-U下垂控制的基础上,提出了一种考虑不同容量的储能单元SOC均衡策略。通过在下垂系数中引入相对容量因子,消除不同容量对SOC的影响,实现充放电过程中SOC均衡;同时增加电压均衡器以解决直流母线电压偏离额定值问题。实验结果表明:所提方法实现了不同容量储能单元的SOC均衡、负荷电流按比例分配及母线电压偏差小的目标,有利于系统高效稳定运行。With the fast development of DC microgrids,the parallel droop control technology of distributed energy storage units(DESU)has received great attention.Aiming at the problems of state of charge(SOC)balance and load current distribution in DESU droop control of DC microgrid,a SOC balancing strategy of energy storage units considering different capacity was proposed based on traditional I-U droop control.The relative capacity factor was introduced into the droop coefficient to eliminate the influence of different capacity on SOC and realize SOC balance during charging and discharging.In the meanwhile,a voltage equalizer was added to solve the problem of DC bus voltage deviating from the rated value.The results show that the proposed method realizes the roles of SOC balance of energy storage units with different capacity,proportional distribution of load current and small deviation of bus voltage,which is conducive to the efficient and stable operation of the system.

关 键 词：直流微电网 分布式储能单元 相对容量因子 电压均衡器 荷电状态 

分 类 号：TM91[电气工程—电力电子与电力传动]