Low-voltage distribution network three-phase load flow calculation method based on phase sequence mixing method

Abstract

The invention discloses a low-voltage power distribution network three-phase load flow calculation method based on a phase sequence mixing method. The method comprises the steps of enabling a single-phase node to be equivalent to a three-phase node in a phase component model to form a three-phase symmetrical low-voltage distribution network; secondly, converting phase component model parameters ofthe power distribution network into sequence component model parameters, then performing load flow calculation by adopting a forward-derivation descendant method, converting an obtained load flow result into a phase component model, and finally solving single-phase node load flow through a previous equivalent superior three-phase node load flow result and parameters. According to the method, a phase component method is adopted for an asymmetric part, and a sequence component method is adopted for a symmetric part, so that the low-voltage power distribution network can also apply the symmetriccomponent method, the number of nodes, which participate in load flow calculation, of the system is reduced in the solving process, and the larger the number of single-phase nodes is, the better thedimension reduction effect is, and the higher the load flow calculation speed is.

Description

technical field [0001] The invention belongs to the field of power system power flow calculation, and relates to a low-voltage power distribution network power flow calculation method, in particular to a low-voltage power distribution network three-phase power flow calculation method based on a phase sequence mixing method. Background technique [0002] The symmetric component method, also known as the sequence component method, was proposed by Fortescue in 1918 and proved that any set of asymmetric n-dimensional phasors can be converted into n-1 n-dimensional symmetric sequence components and 1 zero sequence component. It is a basic method for analyzing the asymmetric operation state of a symmetrical system in a power system. [0003] The power flow calculation of the low-voltage distribution network is to analyze whether the structure of the low-voltage distribution network is reasonable and whether the power distribution of users is reasonable, and provides certain suppor...

AI Technical Summary

Problems solved by technology

Due to the large number of single-phase users in the low-voltage distribution network, the topology of the low-voltage distribution network is asymmetrical, and the load itself is also asymmetrical, so it is difficult to apply the symmetrical component method to the low-voltage distribution network.

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