Power flow calculation of three-phase distribution network based on constant jacobian matrix and newton method

According to basic principle of newton method and the characteristics of distribution network, this paper presents a power flow method of constant jacobian matrix suitable for three-phase asymmetric distribution network. Based on reasonable approximation and phase transformation of node voltages and branch currents, jacobian matrix becomes constant during iterative process, which reduces the amount of computation greatly. The presented algorithm is suitable for distribution networks with multiple voltage levels, loops, PV nodes, etc, so it is universal for distribution network. Simulation results show that the algorithm has reliable convergence and stability.