Research on Power Flow Algorithm of Distribution Network with Distributed Generation

Distributed generation in distribution network will increase the complexity of power flow calculation. So, this work proposes a three-phase power flow calculation, which combines the forward and backward method with the improved implicit Zbus Gauss method. The distribution network's radiation network's power flow is calculated using the forward-backward approach. The auxiliary theorem of matrix splitting and matrix inversion is used to deal with the node admittance matrix in the implicit Zbus Gaussian method. The improved implicit Zbus Gaussian method accustomed to deal with the power flow of the ring network. According to the calculated data, the three-phase voltage, injection current and injection power of the boundary nodes of the radiation network and the ring network are continuously corrected. When dealing with the PV node, the Davenin equivalent circuit is used to calculate the reactive power correction of the PV node. Finally, the IEEE33 – bus unbalanced distribution system is tested.