The invention provides a DC grid power flow controller configuration method. The system power flow operation space is analyzed in a detailed mode, influences on the range by the branch ampacity are considered, a mathematical model for judging whether the power flow operation space changes and whether the branch ampacity requirements are met is brought forward, the model can be used for selection of the DC grid power flow controller access position, and when the grid power flow itself can meet the system safety operation requirements, the technical scheme provided by the invention enables the system power flow to be more reasonably distributed, and thus, the system economy is thus enhanced. When the power grid can not meet the system safety operation requirements due to disconnection or fault, the method can enable the system to meet the safety operation requirements through adjustment of a system power flow operation point, and on the basis, the system power flow distribution is further optimized.