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UHVDC transmission project will adopt hierarchical connection mode at its receiving end with its high and low converters integrated to 500 kV and 1000 kV A C grids respectively on inverter side. The short-circu it fau lt at AC line of hierarchical connected UHVDC transmission system is a serious threat to the safe and stable operation of the system. In this paper, the equivalent model of UHVDC h ierarch ical connection to AC Grid is proposed. The dynamic phasor theory is used to analyse thedoi:10.1088/1755-1315/342/1/012001 fatcat:dti3nf5pfbcznc2cjfdzeowkhu