Method for selecting initial values of three-phase Newton-Raphson method power flow calculation of power distribution network

The invention provides a method for selecting initial values of three-phase Newton-Raphson method power flow calculation of a power distribution network. The method comprises the following steps: S1, establishing a power distribution network three-phase system model; S2, establishing a power distribution network three-phase simplification system, and numbering nodes and branches of the power distribution network three-phase simplification system; S3, storing a three-phase load parameter of each node according to the serial number sequence of the nodes, and storing a three-phase impedance parameter of each branch according to the serial number sequence of the branches; S4, performing per-unit on the three-phase load parameter of each node and the three-phase impedance parameter of each branch; S5, establishing a power distribution network single-phase simplification system; S6, selecting convergence precision, performing power flow calculation on the power distribution network single-phase simplification system by a forward-backward sweep method to obtain the voltage amplitude and the phase angle of each node of the power distribution network single-phase simplification system; S7, selecting the initial value of the three-phase Newton-Raphson method power flow calculation of a power distribution network three-phase system. The method can select the initial value of the three-phase Newton-Raphson method power flow calculation by the forward-backward sweep method with high calculation speed and good convergence.