Research On Power Flow With Electric Power Transmission & Distribution Networks Feature

The large-scale enterprise power network is one kind of network which has the feature of transmission and distribution. There is less analysis and model on it. Power flow calculation plays important roles in power network dispatching, economic operation, fault treatment, and power network planning. It has practical significance in power network planning to research power flow calculation for this kind of network.This paper summarizes the feature of large-scale enterprise power network and main power flow algorithm. Based on analysis convergence mechanism expatiated by Monticelli and other authors, proposes a new theory about the convergence of power flow calculation and verifies that fast decoupled load flow can be applied to power distribution networks. By analyzing the theory of Newton's method and the reason of divergence during the calculation, a criterion of Jacobian matrix condition number and a criterion of voltage during iterating are proposed.Iteration algorithm based on BX method has been programmed in Matlab language, which proved that the BX method can be applied to distribution power flow and conquered the generally ideas that this method can only converge when resistance is much less than reactance. Power flow algorithm of the network which has the feature of transmission and distribution is proposed and the method is programmed in Matlab language. Based on predictor-corrector algorithm's calculation model and BX method, continuation power flow of network with the feature of transmission and distribution is proposed and programmed in Matlab language. The effect of increasing nodal load on power network with the feature of transmission and distribution has been analyzed.