Fault-tolerant method for distribution network fault location based on information completion and correction

Abstract

The invention discloses a power distribution network fault positioning fault tolerance method based on information completion and correction. The power distribution network fault positioning fault tolerance method based on the information completion and correction comprises the following steps: 1) classifying feed breakers in the corresponding topological graph of a power distribution network area, and determining whether current flows through the feed breakers according to switch state information uploaded by terminal equipment; 2) judging whether the switch state information uploaded by the terminal equipment is lost or not; 3) according to a node switch overcurrent decision rule, complementing the switch state information uploaded by the terminal equipment, which has lost information; and 4) carrying out distortion analysis to the switch uploading state information which has no lost information or has completed information, ending if no distortion is in the presence, and otherwise, starting step 5); 5) finding out and correcting distortion information. The power distribution network fault positioning fault tolerance method based on the information completion and correction has the characteristics of high fault positioning accuracy and easiness in implementation.

Description

technical field [0001] The invention relates to a fault-tolerant method for fault location of a distribution network based on information completion and correction, which is a fault-tolerant method for fault location of a distribution network considering the distortion and loss of state information uploaded by a terminal, and relates to the field of fault location of a distribution network. Background technique [0002] The fault location of the traditional distribution network is to send patrol personnel along the line to find the fault point after the fault occurs, which is time-consuming and laborious, resulting in long power outages. Even if the power distribution management center is equipped with a geographic information system, which can assist in troubleshooting and restore power supply, it still takes a long time due to manual intervention. Therefore, in order to improve the reliability of power supply, fault detection must be realized in the power distribution syste...

AI Technical Summary

Problems solved by technology

[0004] Although the method based on graph theory has high positioning accuracy, the premise is that the information uploaded by FTU [feeder automatic measurement and control terminal is a comprehensive automatic monitoring device integrating measurement, protection and monitoring] is accurate and no loss. The information uploaded by the terminal FTU, RTU, etc. is lost or distorted, especially the loss of continuous switch state information, which will make it difficult to use graph theory-based methods for distribution network fault location (or inaccurate location)

Since the terminal is in a harsh environment for a long time, the uploaded state information is prone to distortion; the communication mode of the terminal is unstable, and the continuous switch state information is likely to be lost by using wireless communication. Therefore, the method based on graph theory has considerable limitations and is difficult to adapt to complex terminal environment and wireless communication methods

[0005] The positioning method based on the intelligent algorithm, through multiple iterations, is close to the optimal solution. It has certain fault tolerance for the distortion or loss of individual switch fault information, but it will lead to too many iterations and slow positioning.

In particular, if the uploaded status information is lost or distorted into errors of multiple consecutive switches, the fault tolerance of the location method based on the intelligent algorithm will not meet the fault location requirements, resulting in low fault location accuracy

[0006] In general, whether it is a fault location method based on graph theory or an intelligent algorithm, the correct rate is not very high when the state information uploaded by FTU and other terminal equipment is distorted or lost, which leads to distribution network dispatchers being concerned about isolation It is difficult to choose between the faulty area and the restoration of power supply in the non-faulty area

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