基于虚拟直流电机的多储能SOC均衡控制策略  

Multi-Energy Storage SOC Equalization Strategy Based on Virtual DC Motor Control

作　　者：王君瑞[1] 白冰超 王瑞 豆帅 谭露 朱旭强 WANG Junrui;BAI Bingchao;WANG Rui;DOU Shuai;TAN Lu;ZHU Xuqiang(School of Electrical Information Engineering,North Minzu University,Yinchuan 750021,China)

机构地区：[1]北方民族大学电气信息工程学院,银川市750021

出　　处：《电力建设》2024年第11期14-24,共11页Electric Power Construction

基　　金：国家自然科学基金项目(52167004);宁夏回族自治区智能装备与精密检测技术研究应用创新团队(2022BSB03104);宁夏自然科学基金项目(2024AAC03182)。

摘　　要：直流微网中常用下垂控制来维持直流微源间功率的合理分配,以保证直流微网稳定安全运行。但传统的基于下垂控制的荷电状态(state of charge,SOC)均衡控制策略由于自身特性会引发母线电压跌落以及系统功率分配不合理等问题,故提出一种基于虚拟直流电机控制的多储能SOC均衡控制策略。首先,将虚拟直流电机控制与自适应下垂控制相结合,利用虚拟直流电机控制为系统提供额外惯性和阻尼支撑,减小母线电压跌落,提高系统的暂态稳定性。其次,采用基于改进自适应下垂控制的SOC均衡策略实现多组蓄电池间SOC均衡以及系统功率的合理分配。最后,通过搭建光伏多储能直流微网仿真模型以及实验平台对控制策略进行验证,结果表明:所提控制方法在减小功率波动对直流母线电压影响的同时,可以实现多组蓄电池间SOC均衡。Droop control is commonly used in DC microgrids to maintain a reasonable distribution of power between DC microsources and ensure the stable and safe operation of DC microgrids.However,the traditional state-of-charge balancecontrol strategy based on droop control causes problems such as bus voltage drop and unreasonable system power distribution owing to its characteristics.Therefore,a multi-energy storage state-of-charge balance-control strategy based on virtual DC motor control is proposed.First,the virtual DC motor control is combined with adaptive droop control.A virtual DC motor control is used to provide additional inertia and damping support to the system,reduce the bus voltage drop,and improve the transient stability of the system.Second,the state-of-charge balance strategy based on improved adaptive droop control is used to achieve the state-of-charge balance between multiple sets of batteries and a reasonable distribution of system power.The control strategy was verified using a simulation model of a photovoltaic multi-energy storage DC microgrid and an experimental platform.The results demonstrate that the proposed control method can reduce the influence of power fluctuations on the DC bus voltage and balance the state of charge among multiple sets of batteries.

关 键 词：直流微网 虚拟直流电机 下垂控制 荷电状态 惯性阻尼 

分 类 号：TM721.1[电气工程—电力系统及自动化]