Multiline concurrent loop closing method

Abstract

The invention discloses a multiline concurrent loop closing method, which comprises the steps as follows: a main distribution network model is obtained and spliced; the spliced main distribution network model is subjected to network topology analysis; a node-branch power network model is built by determining buses as nodes and connecting equipment between the buses as branches; node voltages of the nodes are obtained; the node voltages of the nodes include node voltage phases and node voltage amplitudes of the nodes; a concurrent loop closing admittance matrix is obtained; the concurrent loop closing admittance matrix comprises a conventional node admittance matrix and a concurrent loop closing increment matrix; loop closing currents of various loop closing switches are calculated on the basis of the concurrent loop closing admittance matrix and the node voltages of the nodes; whether the loop closing currents exceed a protective limit or not is judged; and if not, the loop closing switches in the main distribution network model are simultaneously turned off. Therefore, the load transfer efficiency is greatly improved; the load transfer time is shortened; and furthermore, induction of large-area blackout is further avoided.

Description

technical field [0001] The invention relates to the technical field of power grid dispatching, and more specifically, relates to a multi-line concurrent loop closing method. Background technique [0002] At present, as the load density of urban power grids increases, the rate of ring network and cable conversion of power grids is getting higher and higher. Hand-in-hand power supply and multi-circuit power supply have become the norm in distribution network design. When a line in the power grid fails, the line loop closure through the distribution automation system can quickly transfer the load to the opposite line, thereby effectively avoiding power outages. [0003] When the substation faces the risk of total shutdown (such as heavy rain causing the water level in the substation to rise, one busbar to be overhauled and the other busbar to fail, etc.), the load must be quickly transferred out in the shortest possible time. The existing technology deals with this situation T...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-line concurrent loop closing method to solve the problems of low load transfer efficiency, long transfer time and easy induction of large-scale power outages in the prior art

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