A Coordinated Power Flow Calculation Method for Transmission and Distribution Based on Least Squares Fitting and Correction

Abstract

The invention discloses a transmission and distribution coordinated power flow calculation method based on least squares method fitting correction. The method includes the following seven main steps: initialization, distribution network power flow calculation, transmission network power flow calculation, convergence test, Fit correction for multiplication, update of the current iteration number, and verification of reaching the maximum number of iterations. In the method of the present invention, the iterative variable is fitted and corrected by using the least square method, which can significantly improve the efficiency and robustness of the overall algorithm for the transmission and distribution coordinated power flow calculation, especially when the distribution network has a large disturbance to the transmission network, that is, the boundary When the node injection power is highly sensitive to the voltage amplitude of the boundary nodes, it can solve the divergence problem of the traditional master-slave split method.

Description

technical field [0001] The invention relates to a power flow analysis method for a power grid, a global power flow analysis method for the coordination of a transmission network and a distribution network, and in particular to a method for calculating a power flow for transmission and distribution coordination based on least square method fitting correction. Background technique [0002] In the traditional dispatching mode, the transmission and distribution network is managed by different dispatching departments, and the analysis and calculation are also carried out independently. However, with a large number of distributed power sources connected, the coupling between the transmission network and the distribution network is greatly enhanced. This traditional independent analysis and calculation mode lacks synchronization and cannot meet the requirements of calculation accuracy. Therefore, the transmission network and the distribution network need to cooperate to calculate t...

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Problems solved by technology

However, with the development of the active distribution network, the disturbance of the distribution network to the transmission network is relatively large, that is, the root node (boundary node) of the distribution network injects power with high sensitivity to the voltage amplitude of the root node, and the traditional master-slave split The method cannot guarantee the convergence performance

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