Method for analyzing loop closing risks based on interconnection switch in power distribution network

Abstract

The invention discloses a method for analyzing loop closing risks based on an interconnection switch in a power distribution network. The method comprises the steps that firstly, the voltage difference of the two sides of the interconnection switch is acquired, a power transmission network CIM model and a power distribution network CIM are spliced to form a loop closing path, and the loop impedance of the loop closing path is calculated; secondly, the loop closing steady-state current and the maximum impact current are worked out according to the voltage difference of the two sides of the interconnection loop and the loop impedance of the loop closing path; lastly, safety verifying is carried out on all devices on the loop through the loop closing impact current and the loop closing steady-state current, and whether loop closing can be carried out or not is judged. The method does not depend on the telemeasuring data of the power transmission network, the computing time is short, the computing result accuracy is high, the convergence problem does not exist, the change of the power transmission network can be followed in real time, the power transmission network loop closing risks under the most situations can be solved, the power outage caused by the loop closing failure is avoided, and the high social benefits and economic benefits are achieved.

Description

technical field [0001] The invention relates to the field of risk analysis in electric power systems, in particular to a method for loop closure risk analysis based on a tie switch in a distribution network. Background technique [0002] With the rapid development of distribution network construction, the technology of power distribution network closing and switching has been gradually improved, and two-way power supply has become a common power supply mode. The biggest feature of the distribution network is the closed-loop structure and the power supply mode of open-loop operation. When the load is reversed or the line is overhauled, the operation of switching power through the contact switch can reduce the power outage time and improve the reliability of power supply. [0003] In order to avoid a large steady-state current and inrush current during the loop closing process, which may cause the line to be overloaded and exceed the limit, or even cause the loop closing line...

AI Technical Summary

Problems solved by technology

[0004] When using the real-time ring-closing power flow algorithm based on the splicing of the main distribution network for analysis, it is necessary to frequently obtain a large amount of real-time data from the main distribution network, and the calculation is huge and time-consuming. Algorithms do not converge often

When using off-line analysis to solve the list of risky contact switches in the distribution network, it is necessary to consider a large safety margin, so that in some cases the normal operation of closing the loop will be excluded as a dangerous operation; in addition, the main After a major change in the network operation mode, it is difficult to update the risk information of the distribution network synchronously

[0005] Therefore, the traditional method based on the risk analysis of contact switch loop closure in the distribution network has relatively large defects, and it is necessary to seek a more practical solution

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