An integrated power flow method for transmission and distribution networks

Abstract

The invention relates to an integrated power flow method of transmission and distribution network. By solving the linear equation, the voltage phase angle and voltage amplitude of each node of the transmission and distribution network are obtained, and then the distribution of active power flow and reactive power flow is solved, including the following steps: 1) obtaining Distribution network topology results, identifying PQ nodes, PV nodes and balance nodes in the transmission and distribution network; 2) Collecting transmission and distribution network node injection data and network parameters; 3) Establishing the integrated linear power flow equation of the transmission and distribution network; 4) According to step 2 ) and step 3), to obtain the voltage phase angle θ′ not including the balance node and the voltage amplitude V of the PQ node N ; 5) Obtain active power flow and reactive power flow according to step 4). Compared with the prior art, the present invention is easy to operate, does not need iteration, has high calculation accuracy, and can avoid repeated alternating iterations in the calculation of the integrated power flow of the transmission and distribution network.

Description

technical field [0001] The invention relates to the technical field of power system power flow calculation, in particular to an integrated power flow method for transmission and distribution networks. Background technique [0002] Power flow calculation is a basic problem in power systems. The mature power flow calculation methods include Newton-Raphson method, fast decoupling method, and DC power flow method. Among them, the Newton-Raphson method and the fast decoupling method are iterative algorithms to solve the nonlinear power flow equation and obtain accurate power flow solutions. However, the nonlinear power flow equation requires multiple iterations to solve, and it is difficult to be embedded in a linear optimization problem. As a linearized power flow calculation method, the DC power flow method does not require iterative solutions, and has the advantages of being simple, fast, and easy to be embedded in linear optimization problems. The disadvantage of the DC pow...

AI Technical Summary

Problems solved by technology

When using the Newton-Raphson method or the fast decoupling method to calculate the integrated power flow of the transmission and distribution network, due to the above-mentioned differences in the transmission and distribution network, the reliability and convergence of the calculation cannot be guaranteed. Even if it converges, the calculation efficiency is not high

However, the DC power flow method cannot consider the node voltage and reactive power flow in the distribution network.

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