FCL （fault current limiter） is used to solve relays miscoordination problem arises from DG （distributed generation） installation. In most published researches, different optimization methods are developed to obtai...FCL （fault current limiter） is used to solve relays miscoordination problem arises from DG （distributed generation） installation. In most published researches, different optimization methods are developed to obtain optimal relay settings to achieve coordination in case of not installing DG, then depending on the achieved optimal obtained relay settings, FCL impedance is deduced to ensure relays coordination restoration in case of installing DG. Based on original optimal relay settings, obtained FCL impedance is not the minimum one required to achieve relay coordination. The contribution of this paper is the generation of multi sets of original relay settings that increase the possibility of finding FCL impedance of minimum value which is lower than the calculated value based on original optimal relay settings. The proposed method achieves better economic target by reducing FCL impedance. The proposed approach is implemented and tested on IEEE-39 bus test system.展开更多
因无接触变压器参数不一致,两接收模块并联的感应耦合电能传输（Inductively coupled power transfer,ICPT）系统会产生模块电流不均流问题。提出以副边半控整流桥电路代替副边不控整流桥电路,实现接收并联模块电流均流。推导两并联接...因无接触变压器参数不一致,两接收模块并联的感应耦合电能传输（Inductively coupled power transfer,ICPT）系统会产生模块电流不均流问题。提出以副边半控整流桥电路代替副边不控整流桥电路,实现接收并联模块电流均流。推导两并联接收模块ICPT系统等效模型,并得到并联模块电流解析式,分析半控整流桥电路实现模块电流均流原理。在已研制的中速磁浮列车非接触供电系统实验装置上完成了实验,所提出的可控整流桥均流策略实现了接收模块并联均流,改善了系统运行。在输出电压220V、负载为6Ω时,实验装置输出功率8kW,均流控制前两并联接收模块电流幅值比为2.34,均流控制后两接收模块电流幅值相等,减少了由于电流不平衡造成的附加损耗。展开更多
采用多拾取模块并联输出的动态感应电能传输(Inductive power transfer,IPT)系统提高了系统的功率传输能力,适用于长轨式的发射结构,在大功率场合有着广泛的应用前景。但由于拾取模块间参数的微小差异以及模块的动态运行,实际的应用过...采用多拾取模块并联输出的动态感应电能传输(Inductive power transfer,IPT)系统提高了系统的功率传输能力,适用于长轨式的发射结构,在大功率场合有着广泛的应用前景。但由于拾取模块间参数的微小差异以及模块的动态运行,实际的应用过程中会出现拾取模块电流分配不平衡的现象,甚至会导致拾取模块过流损坏。从LCC-S的数学模型出发,推导了拾取模块的输出伏安特性与负载分配特性,分析了不同补偿状态下拾取参数对电流分配的影响,并据此提出一种副边失谐补偿的方案。给出了失谐系数的参数设计方法,利用了对副边参数的调节,实现各个模块的近似均流控制。最后,搭建了一台三个拾取模块并联输出的试验样机,应用所提的失谐补偿方法后,模块间最大电流比例由13.02降低到1.3。试验结果与理论分析一致,证明了所提方案的正确性与有效性。展开更多
文摘FCL （fault current limiter） is used to solve relays miscoordination problem arises from DG （distributed generation） installation. In most published researches, different optimization methods are developed to obtain optimal relay settings to achieve coordination in case of not installing DG, then depending on the achieved optimal obtained relay settings, FCL impedance is deduced to ensure relays coordination restoration in case of installing DG. Based on original optimal relay settings, obtained FCL impedance is not the minimum one required to achieve relay coordination. The contribution of this paper is the generation of multi sets of original relay settings that increase the possibility of finding FCL impedance of minimum value which is lower than the calculated value based on original optimal relay settings. The proposed method achieves better economic target by reducing FCL impedance. The proposed approach is implemented and tested on IEEE-39 bus test system.
文摘因无接触变压器参数不一致,两接收模块并联的感应耦合电能传输（Inductively coupled power transfer,ICPT）系统会产生模块电流不均流问题。提出以副边半控整流桥电路代替副边不控整流桥电路,实现接收并联模块电流均流。推导两并联接收模块ICPT系统等效模型,并得到并联模块电流解析式,分析半控整流桥电路实现模块电流均流原理。在已研制的中速磁浮列车非接触供电系统实验装置上完成了实验,所提出的可控整流桥均流策略实现了接收模块并联均流,改善了系统运行。在输出电压220V、负载为6Ω时,实验装置输出功率8kW,均流控制前两并联接收模块电流幅值比为2.34,均流控制后两接收模块电流幅值相等,减少了由于电流不平衡造成的附加损耗。
文摘采用多拾取模块并联输出的动态感应电能传输(Inductive power transfer,IPT)系统提高了系统的功率传输能力,适用于长轨式的发射结构,在大功率场合有着广泛的应用前景。但由于拾取模块间参数的微小差异以及模块的动态运行,实际的应用过程中会出现拾取模块电流分配不平衡的现象,甚至会导致拾取模块过流损坏。从LCC-S的数学模型出发,推导了拾取模块的输出伏安特性与负载分配特性,分析了不同补偿状态下拾取参数对电流分配的影响,并据此提出一种副边失谐补偿的方案。给出了失谐系数的参数设计方法,利用了对副边参数的调节,实现各个模块的近似均流控制。最后,搭建了一台三个拾取模块并联输出的试验样机,应用所提的失谐补偿方法后,模块间最大电流比例由13.02降低到1.3。试验结果与理论分析一致,证明了所提方案的正确性与有效性。
