Fault Sets Collection in AC/DC Hybrid Power Grid

Abstract

Research on fault sets collection in AC/DC hybrid power grid is useful for the study of security analysis and control. This paper proposed a search method for multiple serious faults based on BPA transient stability calculation which consider regulating characteristics of load and generator. First layer fault is chosen according to MIESCR. On the basis of first layer fault, it carried on BPA transient stability calculation, then it propose the weighted comprehensive vulnerability index based on weighted average transmission distance, line power ratio and node voltage variation. The AC lines are recognized through weighted comprehensive vulnerability index, then the key AC line was deemed as the second layer fault. Secondly, subsequent failure consider transmission line and generator protection and DC commutation or even block. Finally, fault sets collection in AC/DC hybrid power grid are constructed. The simulation results of an actual power network show that weighted comprehensive vulnerability index evaluates correctly the impact on the power grid after disconnecting AC line, and the method of building the fault sets is practical.