The reactive power dynamic characteristics of high voltage direct current(HVDC)transmission system are strongly correlated with the HVDC control

which has a significant effect on the AC fault recovery characteristics of the AC grid at the receiving terminal. So the interaction between HVDC control and reactive dynamic characteristics and its effect on AC fault recovery are studied. Firstly

the inherent reactive dynamic characteristic of HVDC system during the AC fault at the receiving terminal is analyzed. On this basis

an alternative method of voltage dependent current order limitation(VDCOL)in HVDC is proposed

where the relationship among the DC current command

the AC bus voltage and the reactive power exchange capacity is studied. Then

according to the different levels of the AC bus voltage

the reactive power exchange capacity of the AC system and the converter station is further studied. Finally

the simulation proves that the improved VDCOL proposed can improve the system fault recovery performance and reduce the probability of commutation failure.