A battery management system(BMS) which contains state of charge(SOC) determination,battery charging control and its optimization,and cell balancing is proposed.Thevenin's model having a RC network characterizing t...A battery management system(BMS) which contains state of charge(SOC) determination,battery charging control and its optimization,and cell balancing is proposed.Thevenin's model having a RC network characterizing the battery polarization is used for SOC determination.The polarization voltage of the battery model is identified using the nonlinear least square technique.The paper presents a new SOC definition method considering the SOC limit of each cell for battery pack in series.The relationship between the battery current and polarization voltage is analyzed.And then the battery charging approach that the charging current can be adaptively adjusted by the polarization voltage control system is investigated based on fuzzy logic control theory.Cell balancing control strategy is also proposed based on the principle of the maximum use for the capacity and energy of the battery pack.展开更多
为满足储能系统提供惯量和一次调频支撑功能需要对多类型储能介质集中配置和优化调控的需求,针对基于模块化多电平换流器(modularmultilevelconverter,MMC)的新型混合储能系统(hybrid energy storage system,HESS)MMC-HESS,提出了混合...为满足储能系统提供惯量和一次调频支撑功能需要对多类型储能介质集中配置和优化调控的需求,针对基于模块化多电平换流器(modularmultilevelconverter,MMC)的新型混合储能系统(hybrid energy storage system,HESS)MMC-HESS,提出了混合同步控制(hybrid synchronous control,HSC)整体策略。MMCHESS采用模块化设计,将超级电容和蓄电池分别安置在高压直流母线侧和子模块内,具备高功率密度和高能量密度的优势。阐述了混合储能系统的拓扑结构和工作原理并采用混合同步控制策略提供系统惯量和一次调频功能及故障限流时的同步能力和孤岛并网切换功能,采用滤波器实现储能功率分配,采用荷电状态(state of charge,SOC)均衡控制实现蓄电池能量均衡。最后,基于硬件在环实验平台,验证了所提拓扑结构与控制策略的可行性和有效性。实验结果表明:所提混合储能系统及其控制策略具备惯量与频率支撑能力,在故障限流、正常并网、孤岛运行之间可灵活切换,能够有效发挥混合储能的综合优势,在中压配电网中具有良好的应用前景。展开更多
为增加系统惯性,直流微电网内锂电池控制器常采用虚拟直流发电机(virtual DC generator,VDCG)控制方案,但该方案无法使锂电池荷电状态(state of charge,SOC)自均衡。现有基于VDCG的锂电池SOC均衡方案仅能实现电压等级一致的非等容锂电池...为增加系统惯性,直流微电网内锂电池控制器常采用虚拟直流发电机(virtual DC generator,VDCG)控制方案,但该方案无法使锂电池荷电状态(state of charge,SOC)自均衡。现有基于VDCG的锂电池SOC均衡方案仅能实现电压等级一致的非等容锂电池SOC均衡,而退役锂电池储能系统(retire lithium battery energy storage systems,RLBESS)的容量和电压等级均难以保持一致。针对此问题,提出了一种基于VDCG的适用于不同电压等级及容量的RLBESS组间SOC均衡方案。该方案在传统VDCG的基础上建立U-P_(m)关系式并引入SOC均衡因子,能够根据初始SOC状态自动调节锂电池的功率分配,并保持良好的电压质量。建立了所提方案的小信号模型,分析了关键控制参数对系统稳定性的影响。最后,利用Matlab/Simulink仿真软件对不同工况进行有效性验证。仿真结果表明:所提方案能够在锂电池电压等级不一致工况下实现RLBESS的SOC均衡,具有良好的可扩展性。展开更多
A modular multilevel converter(MMC)integrated with split battery cells(BIMMCs)is proposed for the battery management system(BMS)and motor drive system.In order to reduce the switching losses,the state of charge(SOC)ba...A modular multilevel converter(MMC)integrated with split battery cells(BIMMCs)is proposed for the battery management system(BMS)and motor drive system.In order to reduce the switching losses,the state of charge(SOC)balancing strategy with a reduced switching-frequency(RSF)is proposed in this paper.The proposed RSF algorithm not only reduces the switching losses,but also features good balancing performance both in the unbalanced and balanced initial states.The results are verified by extensive simulations in MATLAB/Simulink surroundings.展开更多
大容量链式电池储能系统(battery energy storagesystem,BESS)是解决风力发电等可再生能源发电大规模并网问题的有效手段之一。针对BESS的功率调节系统(powerconditioning system,PCS)控制策略,在α-β静止坐标系下应用比例谐振(proport...大容量链式电池储能系统(battery energy storagesystem,BESS)是解决风力发电等可再生能源发电大规模并网问题的有效手段之一。针对BESS的功率调节系统(powerconditioning system,PCS)控制策略,在α-β静止坐标系下应用比例谐振(proportional resonant,PR)调节器实现瞬时功率无静差控制;通过注入零序电压实现相簇间荷电状态(stateof charge,SOC)均衡控制,并通过在各级联单元叠加相应交流电压实现相簇内各单元SOC均衡。仿真结果表明,采用该控制策略的PCS进行瞬时功率控制时具有较快的动态响应速度和较小的稳态误差,同时能有效实现SOC均衡控制,验证了该控制策略的正确性和可行性。展开更多
基于模块化多电平变流器(modular multi-level converter,MMC)的电池储能系统(battery energy storage system,BESS)适用于中高压交直流混合电网,有助于解决可再生能源大规模并网问题。针对电池容量利用率问题,该文分析了MMC-BESS中各...基于模块化多电平变流器(modular multi-level converter,MMC)的电池储能系统(battery energy storage system,BESS)适用于中高压交直流混合电网,有助于解决可再生能源大规模并网问题。针对电池容量利用率问题,该文分析了MMC-BESS中各端电源功率传递关系,提出了一种电池荷电状态(state of charge,SOC)均衡控制策略,通过三级均衡控制,实现相间、上下桥臂间、桥臂内子模块间电池模块的SOC均衡。同时为提高系统运行的可靠性,研究了故障容错运行工况下的SOC均衡控制策略。最后通过仿真和实验验证了所提控制策略的有效性。展开更多
主要针对H桥级联型储能功率转换系统(Power Control System,PCS)电池荷电状态(State of Charge,SOC)的相内均衡控制策略进行理论分析和研究。设计容量等级和额定电压为10 k V/2 MW的储能功率转换系统,研究电池单元的相内SOC均衡控制策略...主要针对H桥级联型储能功率转换系统(Power Control System,PCS)电池荷电状态(State of Charge,SOC)的相内均衡控制策略进行理论分析和研究。设计容量等级和额定电压为10 k V/2 MW的储能功率转换系统,研究电池单元的相内SOC均衡控制策略,构建Matlab仿真模型,仿真验证H桥级联型储能PCS的SOC均衡控制策略。展开更多
基金Supported by National Project 863 Plan(No.2007AA11A103)
文摘A battery management system(BMS) which contains state of charge(SOC) determination,battery charging control and its optimization,and cell balancing is proposed.Thevenin's model having a RC network characterizing the battery polarization is used for SOC determination.The polarization voltage of the battery model is identified using the nonlinear least square technique.The paper presents a new SOC definition method considering the SOC limit of each cell for battery pack in series.The relationship between the battery current and polarization voltage is analyzed.And then the battery charging approach that the charging current can be adaptively adjusted by the polarization voltage control system is investigated based on fuzzy logic control theory.Cell balancing control strategy is also proposed based on the principle of the maximum use for the capacity and energy of the battery pack.
文摘为满足储能系统提供惯量和一次调频支撑功能需要对多类型储能介质集中配置和优化调控的需求,针对基于模块化多电平换流器(modularmultilevelconverter,MMC)的新型混合储能系统(hybrid energy storage system,HESS)MMC-HESS,提出了混合同步控制(hybrid synchronous control,HSC)整体策略。MMCHESS采用模块化设计,将超级电容和蓄电池分别安置在高压直流母线侧和子模块内,具备高功率密度和高能量密度的优势。阐述了混合储能系统的拓扑结构和工作原理并采用混合同步控制策略提供系统惯量和一次调频功能及故障限流时的同步能力和孤岛并网切换功能,采用滤波器实现储能功率分配,采用荷电状态(state of charge,SOC)均衡控制实现蓄电池能量均衡。最后,基于硬件在环实验平台,验证了所提拓扑结构与控制策略的可行性和有效性。实验结果表明:所提混合储能系统及其控制策略具备惯量与频率支撑能力,在故障限流、正常并网、孤岛运行之间可灵活切换,能够有效发挥混合储能的综合优势,在中压配电网中具有良好的应用前景。
文摘为增加系统惯性,直流微电网内锂电池控制器常采用虚拟直流发电机(virtual DC generator,VDCG)控制方案,但该方案无法使锂电池荷电状态(state of charge,SOC)自均衡。现有基于VDCG的锂电池SOC均衡方案仅能实现电压等级一致的非等容锂电池SOC均衡,而退役锂电池储能系统(retire lithium battery energy storage systems,RLBESS)的容量和电压等级均难以保持一致。针对此问题,提出了一种基于VDCG的适用于不同电压等级及容量的RLBESS组间SOC均衡方案。该方案在传统VDCG的基础上建立U-P_(m)关系式并引入SOC均衡因子,能够根据初始SOC状态自动调节锂电池的功率分配,并保持良好的电压质量。建立了所提方案的小信号模型,分析了关键控制参数对系统稳定性的影响。最后,利用Matlab/Simulink仿真软件对不同工况进行有效性验证。仿真结果表明:所提方案能够在锂电池电压等级不一致工况下实现RLBESS的SOC均衡,具有良好的可扩展性。
文摘A modular multilevel converter(MMC)integrated with split battery cells(BIMMCs)is proposed for the battery management system(BMS)and motor drive system.In order to reduce the switching losses,the state of charge(SOC)balancing strategy with a reduced switching-frequency(RSF)is proposed in this paper.The proposed RSF algorithm not only reduces the switching losses,but also features good balancing performance both in the unbalanced and balanced initial states.The results are verified by extensive simulations in MATLAB/Simulink surroundings.
文摘基于模块化多电平变流器(modular multi-level converter,MMC)的电池储能系统(battery energy storage system,BESS)适用于中高压交直流混合电网,有助于解决可再生能源大规模并网问题。针对电池容量利用率问题,该文分析了MMC-BESS中各端电源功率传递关系,提出了一种电池荷电状态(state of charge,SOC)均衡控制策略,通过三级均衡控制,实现相间、上下桥臂间、桥臂内子模块间电池模块的SOC均衡。同时为提高系统运行的可靠性,研究了故障容错运行工况下的SOC均衡控制策略。最后通过仿真和实验验证了所提控制策略的有效性。
文摘主要针对H桥级联型储能功率转换系统(Power Control System,PCS)电池荷电状态(State of Charge,SOC)的相内均衡控制策略进行理论分析和研究。设计容量等级和额定电压为10 k V/2 MW的储能功率转换系统,研究电池单元的相内SOC均衡控制策略,构建Matlab仿真模型,仿真验证H桥级联型储能PCS的SOC均衡控制策略。
