Method for calculating three-phase tide of power distribution network on basis of neutral point offset

Abstract

The invention relates to a method for calculating three-phase tide of a power distribution network on the basis of neutral point offset. The method includes steps of acquiring medium-voltage power distribution network topology, numbering various nodes and various branches on a calculation feeder line; introducing neutral point voltage offset of each node; rectifying calculated phase voltage values of all the nodes by the neutral point offset; calculating load current value of the nodes by adopting the rectified calculated phase voltage values; calculating three-phase branch current of each branch and three-phase voltage value of each node by forward-back substitution method; iterating by the Newton-Raphson method, and rectifying the neutral point voltage offset; dissolving the three-phase voltage by means of hybrid iteration; judging whether the three-phase voltage value in the step G meets iteration terminating condition or not; and calculating three-phase tide distribution and outputting result. Restraint relation among three-phase current is processed by introducing the neutral point offset, and the problem about calculation of the three-phase tide of the power distribution network is effectively solved by means of advantages of mixed iteration method combined the forward-back substitution with the Newton-Raphson method.

Description

technical field [0001] The invention relates to the technical field of power system operation analysis and control, in particular to a three-phase power flow calculation method of a distribution network based on a neutral point offset. Background technique [0002] Power flow calculation is the most basic and important calculation in power system analysis, and it is the basis of power system planning, operation analysis, control and optimization. From the application point of view, the power flow calculation of the power system can be divided into two types, one is based on the power system parameter symmetry, load symmetry and single-phase power flow calculation in the normal operating state of the system, and the other is based on the system network parameter Three-phase power flow calculation with three-phase asymmetry. For a long time, experts and scholars have conducted a lot of in-depth research on the power flow calculation of the transmission network. The power tran...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for calculating the three-phase power flow of distribution network based on the neutral point offset. The method of the present invention introduces the neutral point offset to deal with the constraint relationship among the three-phase currents. The hybrid iterative method combining forward push-back generation and Newton-Raphson uses the advantages of both to effectively solve the problem of three-phase power flow calculation in distribution network

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