Maximizing the utilization of lithium-ion battery capacity is an important means to alleviate the range anxiety of electric vehicles.Battery pack inconsistency is the main limiting factor for improving battery pack ca...Maximizing the utilization of lithium-ion battery capacity is an important means to alleviate the range anxiety of electric vehicles.Battery pack inconsistency is the main limiting factor for improving battery pack capacity utilization,and poses major safety hazards to energy storage systems.To solve this problem,a maximum capacity utilization scheme based on a path planning algorithm is proposed.Specifically,the reconfigurable topology proposed is highly flexible and fault-tolerant,enabling battery pack consistency through alternating cell discharge and reducing the increased risk of short circuits due to relay error.The Dijkstra algorithm is used to find the optimal energy path,which can effectively remove faulty cells and find the current path with the best consistency of the battery pack and the lowest relay loss.Finally,the effectiveness of the scheme is verified by hardware-in-the-loop experiments,and the experimental results show that the state-of-charge SOC consistency of the battery pack at the end of discharge is increased by 34.18%,the relay energy loss is reduced by 0.16%,and the fault unit is effectively isolated.展开更多
针对水平偏移与电池充电时输出功率可控性较弱的问题,提出一种可重构无线充电系统WCS(wireless charging system)。通过合理地切换传能通道,实现互感与负载较宽范围变化时恒流/恒压充电和全桥逆变器软开关ZVS(zero voltage switching)...针对水平偏移与电池充电时输出功率可控性较弱的问题,提出一种可重构无线充电系统WCS(wireless charging system)。通过合理地切换传能通道,实现互感与负载较宽范围变化时恒流/恒压充电和全桥逆变器软开关ZVS(zero voltage switching)状态。首先,分析系统电路拓扑,推导系统参数与充电电流/电压、ZVS状态之间关系式,据此阐释系统重构与功率可控的合理性;其次,构造交叠线圈式磁耦合机构MCSC(magnetic coupler with sandwich coils),分析其水平偏移性能,为系统高偏移容忍度的设计提供依据;第三,分析WCS的工作流程,设计的闭环控制器实现了较宽偏移与负载波动时恒流/恒压充电、ZVS状态;最后,搭建旋翼无人机用WCS,实验结果表明,最大输出功率为126 W且系统效率大于85%时,水平偏移范围为直径340 mm的圆形区域。展开更多
超大规模数据中心成为数字社会的关键基础设施。用户端应用的激增使得数据中心网络(Data Center Networks,DCNs)的东西向流量呈指数级增长,同时端应用的多样化也导致了严重的流量倾斜问题。此外,后摩尔时代的到来和Dennard缩放的失效使...超大规模数据中心成为数字社会的关键基础设施。用户端应用的激增使得数据中心网络(Data Center Networks,DCNs)的东西向流量呈指数级增长,同时端应用的多样化也导致了严重的流量倾斜问题。此外,后摩尔时代的到来和Dennard缩放的失效使得数据中心网络设备容量的增速趋缓。数据中心网络面临用户激增、流量倾斜和CMOS性能墙等多重压力。为解决上述问题,可重构数据中心网络(Reconfigurable Data Center Networks,RDCNs)应运而生。文中首先介绍RDCNs的5个研究驱动力,重点概述了两类物理层使能技术;其次,详细阐述RDCNs研究分类和链路重构、层重构以及拓扑重构这三大设计空间关键技术的研究现状;然后,简述RDCNs理论的研究进展;最后,展望未来研究方向并总结全文。展开更多
针对仅仅依靠初始构形组成模块间的相互协调运动无法完成自重构任务这一情况,结合DL-Cube(Double L Cube)自重构机器人单元模型的结构特性,设计构建了风车形子单元,该子单元具有移动、转变模块方位、携带模块等能力.提出了基于公共拓扑...针对仅仅依靠初始构形组成模块间的相互协调运动无法完成自重构任务这一情况,结合DL-Cube(Double L Cube)自重构机器人单元模型的结构特性,设计构建了风车形子单元,该子单元具有移动、转变模块方位、携带模块等能力.提出了基于公共拓扑的自重构规划策略,即在进行自重构之前利用分级优化机制搜索出初始构形与目标构形之间的最大公共拓扑,然后以此公共拓扑为目标构形的生长中心,同时,借助于风车形子单元移动、转变模块方位及携带模块的能力,最终实现目标构形的重构.利用仿真实验验证了上述理论的有效性和可行性.展开更多
基金supported in part by the National Natural Science Foundation of China(62203352,U2003110)in part by the Key Laboratory Project of Shaanxi Provincial Department of Education(20JS110)in part by the Thousand Talents Plan of Shaanxi Province for Young Professionals。
文摘Maximizing the utilization of lithium-ion battery capacity is an important means to alleviate the range anxiety of electric vehicles.Battery pack inconsistency is the main limiting factor for improving battery pack capacity utilization,and poses major safety hazards to energy storage systems.To solve this problem,a maximum capacity utilization scheme based on a path planning algorithm is proposed.Specifically,the reconfigurable topology proposed is highly flexible and fault-tolerant,enabling battery pack consistency through alternating cell discharge and reducing the increased risk of short circuits due to relay error.The Dijkstra algorithm is used to find the optimal energy path,which can effectively remove faulty cells and find the current path with the best consistency of the battery pack and the lowest relay loss.Finally,the effectiveness of the scheme is verified by hardware-in-the-loop experiments,and the experimental results show that the state-of-charge SOC consistency of the battery pack at the end of discharge is increased by 34.18%,the relay energy loss is reduced by 0.16%,and the fault unit is effectively isolated.
文摘超大规模数据中心成为数字社会的关键基础设施。用户端应用的激增使得数据中心网络(Data Center Networks,DCNs)的东西向流量呈指数级增长,同时端应用的多样化也导致了严重的流量倾斜问题。此外,后摩尔时代的到来和Dennard缩放的失效使得数据中心网络设备容量的增速趋缓。数据中心网络面临用户激增、流量倾斜和CMOS性能墙等多重压力。为解决上述问题,可重构数据中心网络(Reconfigurable Data Center Networks,RDCNs)应运而生。文中首先介绍RDCNs的5个研究驱动力,重点概述了两类物理层使能技术;其次,详细阐述RDCNs研究分类和链路重构、层重构以及拓扑重构这三大设计空间关键技术的研究现状;然后,简述RDCNs理论的研究进展;最后,展望未来研究方向并总结全文。
文摘针对仅仅依靠初始构形组成模块间的相互协调运动无法完成自重构任务这一情况,结合DL-Cube(Double L Cube)自重构机器人单元模型的结构特性,设计构建了风车形子单元,该子单元具有移动、转变模块方位、携带模块等能力.提出了基于公共拓扑的自重构规划策略,即在进行自重构之前利用分级优化机制搜索出初始构形与目标构形之间的最大公共拓扑,然后以此公共拓扑为目标构形的生长中心,同时,借助于风车形子单元移动、转变模块方位及携带模块的能力,最终实现目标构形的重构.利用仿真实验验证了上述理论的有效性和可行性.
