摘要
在孤岛直流微电网系统中,线路阻抗不匹配会影响各线路的电流分配精度和荷电状态(state of charge,SOC)均衡效果。同时,由于采用下垂控制,虚拟阻抗的存在也会导致直流母线电压下降。针对以上问题,提出了一种基于自适应虚拟阻抗的SOC均衡控制策略。该策略考虑了不同容量的分布式储能单元(distributed energy storage units,DESUs),并设计了交互DESUs邻居单元SOC均衡差异信息的收敛因子,以加快SOC均衡速度。利用结合多种系统状态信息的状态因子,通过单补偿环节即可实现输出电流的精准分配以及母线电压的恢复。使用改进后的动态平均一致性算法获取系统全局平均状态信息估计值。最后,在Matlab/Simulink仿真软件中搭建了4种工况模型,验证了所提控制策略的有效性和可靠性。
The mismatch of line impedance impacts the accuracy of current distribution and the state of charge(SOC)balance in an isolated island DC microgrid system.Furthermore,virtual impedance reduces the DC bus voltage due to droop control.To address these challenges,we propose an SOC equalization control strategy based on adaptive virtual impedance.Our strategy considers distributed energy storage units(DESUs)with different capacities and designs convergence factors to accelerate SOC balance by exchanging SOC balance difference information among neighboring DESUs.A single compensation link,integrating various system state information,enables precise distribution of output current and recovery of bus voltage.The improved dynamic average consistency algorithm estimates the global average state information.Finally,four working condition models are built by employing Matlab/Simulink simulation software,which verifies the effectiveness and reliability of our control strategy.
作者
王嘉梅
罗沁
黄璇
刘志灿
WANG Jiamei;LUO Qin;HUANG Xuan;LIU Zhican(School of Electrical and Information Engineering,Yunnan Minzu University,Kunming 650504,China;Yunnan Key Laboratory of Unmanned Autonomous System,Kunming 650504,China;School of Electrical and Electronic Engineering,Chongqing University of Technology,Chongqing 400054,China)
出处
《重庆理工大学学报(自然科学)》
北大核心
2025年第1期185-194,共10页
Journal of Chongqing University of Technology:Natural Science
基金
国家自然科学基金项目(61963038)。
关键词
直流微电网
荷电状态
虚拟阻抗
电流分配
电压恢复
DC microgrid
state of charge
virtual impedance
current distribution
voltage recovery
