The voltage source converter based high voltage direct current(VSC-HVDC)transmission technology has good application prospects owing to its excellent controllability

voltage stability and good adaptability to power supply for load center

wind power accommodation

and power transmission among islands. The present research on power flow of VSC-HVDC system is mostly based on constant power control mode without considering the practical converter voltage control characteristics. In order to more accurately reflect the voltage control characteristics of VSC in the actual power grid

a voltage control model based on VSC is developed. As well

converter loss

AC filter

and converter capacity limit are considered in the power flow model. And a general power flow algorithm is proposed for power flow of the VSC based multi-terminal DC/AC system. Some cases with changed DC grid power injection

N-1 contingency and multi-terminal DC/AC system

are built and analyzed. The case analysis indicates that the power flow algorithm is able to reflect the voltage control ability of DC converters

while verifying the effectiveness

rationality and algorithm rapidity based on voltage control characteristics.