船舶电力系统短路电流计算方法适用性研究

Adaptability of Short-circuit Current Calculation in Ship's Power System

短路电流计算是减小船舶电力系统短路故障危害的基础,但各种计算方法在同一系统的不同工况下的计算误差有所不同。为了明确不同工况下各种计算方法的适用性,减小短路计算的误差,以中压交流电力推进船舶为研究对象,分别采用GJB-173、GJB-173改进、IEC61363三种算法对短路电流值进行了计算。基于Simulink仿真软件编制了该船舶电力系统的数值仿真程序,并将短路计算结果与数值仿真结果进行了对比。通过对三种典型方法在不同运行方式下的计算结果进行的分析,给出了船舶电力系统在不同的运行方式下相适应的短路电流计算方法。

Short-circuit current calculation is the basis of decreasing the hazard by short-circuit fault resulting in the ship＇s power system. But different calculation methods exist in different calculation deviations to the same system＇s different conditions. In order to define the applicability of the various calculation methods under different conditions and to reduce short-circuit calculation deviations, with an AC medium voltage electric propulsion ship as research subjects, the three calculation methods, GJB-173,GJB-173 improvements and IEC61363, are used to calculate short-circuit current. Numerical simulation program of the ship electrical system is programmed on the basis of Simulink and the results of both calculations and the numerical simulation are compared. The calculation results of the three typical methods in different conditions are analyzed and the adapted short-circuit current calculation methods of the ship electrical system in different operation modes are given.