基于电压平移的SOC均衡与功率分配策略  

SOC equalization and power allocation strategy based on voltage shifting

作　　者：代广贵 何晋[1] 吴富磊 张博嘉 范家玮 DAI Guanggui;HE Jin;WU Fulei;ZHANG BoJia;FAN Jiawei(School of Electrical and Information Technology,Yunnan Minzu University,Kunming 650031,China)

机构地区：[1]云南民族大学电气信息工程学院,云南昆明650031

出　　处：《电力科学与技术学报》2023年第5期98-110,共13页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金(52061042);云南教育厅科学研究基金(2022Y454)。

摘　　要：线路阻抗的不匹配会降低孤岛直流微电网中的分布式储能单元(distributed energy storage units,DESUs)的功率分配精度,且影响蓄电池荷电状态(state of charge,SOC)的均衡效果,同时传统下垂控制会造成直流母线电压的跌落。针对此问题,首先引入SOC均衡变量,分析各系数变化对均衡变量的影响效果;其次,将功率分配变量与DESUs的输出电压结合为信息交换变量,且通过简单积分器得到下垂控制参考电压的修正项。系统稳态时,所提策略实现了各DESUs的SOC快速均衡,输出功率按容量分配,以及平均母线电压被稳定在给定值处;最后,基于MATLAB/Simulink搭建模型的仿真结果验证了所提策略的有效性。The mismatch of converter output line impedance reduces the power distribution accuracy of distributed energy storage units in an islanded DC microgrid and affects the balance of the state of charge,while the traditional droop control causes the drop of DC bus voltage.To address this problem,the proposed strategy firstly defines the SOC equalization factor and analyzes the effect of each factor change on it;secondly,the power distribution factor is combined with the converter output voltage as the information exchange factor,and the correction term of the sag control reference voltage is obtained through the integrator.At the system’s steady state,the proposed strategy achieves SOC equalization of each DESU,output power distribution according to capacity,and the average bus voltage is stabilized at a given value;finally,the simulation results based on the model verify the effectiveness of the proposed strategy.

关 键 词：直流微电网 荷电状态均衡 分布式二次控制 功率分配 

分 类 号：TM863[电气工程—高电压与绝缘技术]