Abstract
High voltage direct current (HVDC) technology has become an important solution for the interconnection of large-scale power grids. The AC/DC hybrid grid is gradually becoming an important pattern of the modern power grid. Based on the extended equal area criterion (EEAC) theory, this paper presents a coordinated emergency control strategy combining HVDC emergency control and generator tripping to enhance the transient stability of AC/DC hybrid power systems. Firstly, when the fault occurs, the generators are divided into two clusters and then equivalent to a single machine. Subsequently, by fitting the electromagnetic power curve after fault clearance, the equal area rule is used for quantitative analysis to determine the control quantity of HVDC emergency control and generator tripping. Finally, time-domain simulation results provided by PSCAD/EMTDC are used to validate the effectiveness of the proposed method.
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