A calculation method and system for closing loop current of distribution network with multi-branch branch lines

Abstract

The present invention relates to the technical field of distribution network operation and protection, and more specifically, to a method and system for calculating the closed loop current of a distribution network with multi-branch branch lines, including the following steps: S10. Obtaining the power grid from multiple data sources Topological structure, component parameters, switch status and analog data, and convert the data file format of the obtained data; S20. According to the switch selected by the user interface and the bus corresponding to the loop-closing feeder, form the loop-closing loop and the topology structure of the loop-closing network, and Use the real-time operation data to calculate the corresponding loop closing operation; S30. Obtain the power flow calculation results of the loop closing loop and the loop closing steady current calculation results according to the loop closing network topology; S40. Form a loop closing analysis report according to the loop closing current calculation results . The present invention uses multi-source information fusion technology to fuse the analyzed data into a unified data source, and completes the calculation of real-time loop closing steady-state current and impact current, achieving the purpose of safe and efficient loop closing calculation, and effectively ensuring the power supply of the distribution network reliability.

Description

technical field [0001] The present invention relates to the technical field of distribution network operation and protection, and more specifically, to a method and system for calculating loop closing current of a distribution network with multi-branch branch lines. Background technique [0002] In order to improve the power supply reliability of the distribution network, reduce the number of times users perceive power outages, and improve service quality, the power grid has conducted long-term exploration and research, and some prefectural and municipal bureaus have fully carried out the operation of closing the loop to power supply, which can reduce short-term power outages for users times, improve power supply reliability and user satisfaction. The system impedance of different 220kV systems may be quite different, and the loop closing operation may cause large power flow changes. In the initial stage of the loop closing operation, it is required that the distribution lin...

AI Technical Summary

Problems solved by technology

However, with the continuous development of the power grid, there are more and more loop closing points that do not meet the conditions of 10KV line closing with the same 220kV power supply. Therefore, it is necessary to study the safety of the live loop closing operation of 10kV lines with different 220kV power supplies.

[0003] However, since the current safety assessment is based on offline data, when the real-time changes in the loop closure method lead to a large difference from the typical method, the safety of the loop closure can only be judged through extreme boundary conditions, and the calculation results of a large number of operating modes It also shows that the safety boundary determined by extreme methods is relatively conservative, and there are a large number of loop closure points whose safety cannot be determined, which affects the availability of loop closure and power transfer operations, and thus affects the reliability of power supply

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