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Study on Single Bus Separation Mode and In-out Line Arrangement Based on Short Circuit Current Optimization

In order to limit the short circuit current (SCC) in the power system, bus separate operation is the most simple, effective and economical way. When limiting the SCC by using the method of bus separation, the specific switch of the bus is usually broken after the topology of the in-out lines of bus are fixed, but the influence of the arrangement of the bus in-out lines and the mode of bus separation on the effect of SCC limitation is not considered. Based on the virtual branch method, this paper studies the influence of the bus in-out line arrangement and mode of bus separation on the node SCC, and takes the SCC as the optimization target, so as to get the optimal scheme. From the node impedance matrix, this method illustrates the influence of bus separation mode and in-out line arrangement on the SCC. Finally, the effectiveness of this method is analyzed and verified in IEEE39 node standard network. The example shows that the result of the model is consistent with the conventional enumeration method, but the enumeration times are reduced by more than half.