为计算直流应急电网不同故障类型下的短路电流,便于直流应急电网开关器件的型号以及相应的保护措施的选择,提出了一种考虑蓄电池Run-time等效模型的船舶直流应急电网短路电流计算方法.与传统蓄电池的Thevenin等效模型和PNGV(the partnership for a new generation of vehicles)等效模型相比,所提方法考虑了蓄电池容量衰减、温度、循环次数、存储时长、电流倍率、自身产热等多因素的影响,对蓄电池的故障等值电路进行了精确模拟.最后,利用实际的直流应急电网短路电流仿真和实验验证了所提方法的准确性,与Thevenin等效模型和PNGV等效模型相比,不同故障下蓄电池Run-time等效模型短路电流的计算误差更小.
Short-circuit current calculation of ship DC emergency power grid considering battery run-time equivalent model
The purpose of this paper is to calculate the short-circuit current of direct current(DC)emergency power grid under different fault types,so as to deal with the selections of the type of DC emergency power grid switching device and the corresponding protection measures.Accordingly,a short-circuit current calculation method of DC emergency power grid considering the battery run-time equivalent model is proposed.Compared with Thevenin equivalent model and PNGV(the partnership for a new generation of vehicles)equivalent model of traditional battery,the proposed method takes into account the influence of battery capacity attenuation,temperature,cycling times,storage time,current rate,self-heat generation and other factors,and accurately simulates the fault equivalent circuit of battery.Finally,the accuracy of the proposed method is verified by the simulation and experiment of the short-circuit current of an actual DC emergency power grid.Compared with Thevenin equivalent model and PNGV equivalent model,the calculation error of the short-circuit current of the battery run-time equivalent model under different faults is smaller.
DC emergency power gridrun-time equivalent modelshort-circuit currentfault equivalencefault type
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