In order to provide a fast quantification method for the site selection and reactive power allocation of UHVDC rectifier station

the typical transient voltage curves of AC buses in rectifier stations after DC faults are analyzed

and the two-stage characteristics of voltage rise

namely

the voltage rise after load rejection and the climb stage under increment of reactive power by capacitors

are revealed. Based on the characteristics

an analytical calculation method for voltage rise of AC bus in rectifier station is established. The relationship between short circuit ratio of DC and voltage rise of rectifier station is established. The result shows that the maximum limitation of transient voltage rise of AC bus should not exceed 1.3

and the short circuit ratio of rectifier station in rectifier station should be not less than 3.6. A method for calculating the maximum transmission power of UHVDC is proposed and applied to Shanghaimiao-Linyi UHVDC

and the results show that the maximum transmission power is 8 100～9 300 MW when the supporting thermal power is 6 000～ 8 000 MW. After two 300 MVA unit synchronous condensers are equipped

the the maximum transmission power can reach 10 000 MW under 6 000 MW supporting thermal power.