A Coordinated Power Flow Calculation Method for Transmission and Distribution Based on Iterative Variable Historical Value Update

Abstract

The invention discloses a transmission and distribution collaborative power flow calculation method based on the update of the historical value of the iterative variable. The method includes seven main steps: initialization, updating the iterative variable based on the historical value of the iterative variable, convergence inspection, iterative calculation of the transmission and distribution network, and memory Matrix update, current iteration number update, maximum iteration number check. Compared with the traditional master-slave split method, the method of the present invention introduces a memory matrix, and updates the iterative variable based on the historical value of the iterative variable, which can significantly improve the efficiency and robustness of the overall algorithm for transmission and distribution coordinated power flow calculation, especially in the distribution network. When the disturbance of the transmission network is large, that is, when the sensitivity of the boundary node injection power to the boundary node voltage amplitude is high, it can solve the divergence problem of the traditional master-slave split method. At the same time, the method has strong operability and is easy to implement.

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 power flow calculation method for transmission and distribution coordination based on updating historical values ​​of iterative variables. 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 calc...

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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 power injection of the root node (boundary node) of the distribution network has a 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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