Research On Three-phase Power Flow Calculation Based On Symmetrical Component Coordinate

Based on the analysis and summary of the existing Gauss algorithm of power systems, this paper proposes the three-phase fast Ybus flow calculation method, which is using a symmetrical component coordinate system. The new method implements network parameters of the symmetrical components decoupling, makes the network nodal admittance matrix become a sparse matrix, reduces the memory usage and saves the computing time significantly. At the same time, it adopts the three-phase fast Ybus flow calculation method to deal with PV nodes, and avoids affecting the calculation of the convergence performance because of repeatedly calculating the reactive power of PV nodes. Through the analysis of three-phase system of the classical IEEE 24 nodes, the method presented in this paper has been proven to be fast and reliable. Finally, the method is successfully applied to practical engineering projects in Anshan power distribution network system.