In order to overcome the shortcoming of the classical Hungarian algorithm that it can only solve the problems where the total cost is the sum of that of each job, an improved Hungarian algorithm is proposed and used t...In order to overcome the shortcoming of the classical Hungarian algorithm that it can only solve the problems where the total cost is the sum of that of each job, an improved Hungarian algorithm is proposed and used to solve the assignment problem of serial-parallel systems. First of all, by replacing parallel jobs with virtual jobs, the proposed algorithm converts the serial-parallel system into a pure serial system, where the classical Hungarian algorithm can be used to generate a temporal assignment plan via optimization. Afterwards, the assignment plan is validated by checking whether the virtual jobs can be realized by real jobs through local searching. If the assignment plan is not valid, the converted system will be adapted by adjusting the parameters of virtual jobs, and then be optimized again. Through iterative searching, the valid optimal assignment plan can eventually be obtained.To evaluate the proposed algorithm, the valid optimal assignment plan is applied to labor allocation of a manufacturing system which is a typical serial-parallel system.展开更多
针对电池组并联均衡研究较少及能量利用率较低的问题,该文提出了一种基于部分功率变换(partial power conversion,PPC)的电池组并联均衡拓扑。该拓扑结合双有源桥(dual active bridge,DAB)变换器和串联谐振型双有源桥(series resonant d...针对电池组并联均衡研究较少及能量利用率较低的问题,该文提出了一种基于部分功率变换(partial power conversion,PPC)的电池组并联均衡拓扑。该拓扑结合双有源桥(dual active bridge,DAB)变换器和串联谐振型双有源桥(series resonant dual active bridge, SR-DAB)变换器,采用PPC结构,能够极大减少系统损耗,提升系统效率。在此基础上,以电池荷电状态(state of charge, SOC)均衡为目标,在SR-DAB的单移相控制中加入SOC均衡控制,实现电池组的充放电均衡。基于RT-Box的实时仿真结果表明,所提拓扑及均衡控制策略能够有效地实现并联电池组之间的均衡,且在不同工况下其系统效率均高于采用全功率处理(full power processing,FPP)结构系统的效率。展开更多
文摘In order to overcome the shortcoming of the classical Hungarian algorithm that it can only solve the problems where the total cost is the sum of that of each job, an improved Hungarian algorithm is proposed and used to solve the assignment problem of serial-parallel systems. First of all, by replacing parallel jobs with virtual jobs, the proposed algorithm converts the serial-parallel system into a pure serial system, where the classical Hungarian algorithm can be used to generate a temporal assignment plan via optimization. Afterwards, the assignment plan is validated by checking whether the virtual jobs can be realized by real jobs through local searching. If the assignment plan is not valid, the converted system will be adapted by adjusting the parameters of virtual jobs, and then be optimized again. Through iterative searching, the valid optimal assignment plan can eventually be obtained.To evaluate the proposed algorithm, the valid optimal assignment plan is applied to labor allocation of a manufacturing system which is a typical serial-parallel system.
文摘针对电池组并联均衡研究较少及能量利用率较低的问题,该文提出了一种基于部分功率变换(partial power conversion,PPC)的电池组并联均衡拓扑。该拓扑结合双有源桥(dual active bridge,DAB)变换器和串联谐振型双有源桥(series resonant dual active bridge, SR-DAB)变换器,采用PPC结构,能够极大减少系统损耗,提升系统效率。在此基础上,以电池荷电状态(state of charge, SOC)均衡为目标,在SR-DAB的单移相控制中加入SOC均衡控制,实现电池组的充放电均衡。基于RT-Box的实时仿真结果表明,所提拓扑及均衡控制策略能够有效地实现并联电池组之间的均衡,且在不同工况下其系统效率均高于采用全功率处理(full power processing,FPP)结构系统的效率。
