Three-phase flow calculation method for power distribution network based on linear load model

Abstract

The invention discloses a three-phase flow calculation method for a power distribution network based on a linear load model, and the method comprises the steps: expanding the Taylor series in a visual real number field, and enabling a star-shaped load and a triangular load to be linearized in a three-phase power distribution system according to the characteristics of a node voltage of the power distribution network through simplifying the node voltage phase angle and voltage operator of the power distribution network; carrying out the unified processing of the star-shaped load and the triangular load through a coefficient matrix, and building two types of unified linear three-phase ZIP load models, wherein the unified linear three-phase ZIP load models are called as a VV linear load model and an XV linear load model according to a result whether the models comprise V conjugate; building two types of three-phase linear flow equations according to the two types of linear load models, and respectively calling the three-phase linear flow equations as a VV linear three-phase linear flow equation and an XV linear three-phase linear flow equation. Compared with a conventional three-phase flow calculation method for the power distribution network based on an iteration method, the method provided by the invention irons out the defects of slow calculation speed and low calculation precision caused by iteration, and can effectively solve a problem of the calculation of three-phase flow of the power distribution network.

Description

technical field [0001] The invention belongs to the field of power system power flow calculation and analysis, and in particular relates to a three-phase power flow calculation method of a distribution network based on a linear load model. Background technique [0002] At present, three-phase unbalanced systems commonly exist in medium and low-voltage distribution networks with multiple line systems coexisting. Single-phase power flow cannot meet the needs of analysis, and three-phase power flow calculations should be carried out. [0003] Three-phase power flow calculation can be divided into sequence component method and phase component method according to the calculation components. The sequence component method has the characteristics of small calculation amount and fast calculation speed. It is easy to deal with the situation of symmetrical lines and asymmetric loads, but it is difficult to deal with uneven line structures For symmetrical (asymmetrical parameters and la...

AI Technical Summary

Problems solved by technology

This method is a non-iterative method, which avoids the disadvantages of slow calculation speed and low calculation accuracy caused by iteration, and can effectively solve the problem of three-phase power flow calculation in distribution networks.

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