Fault location method for complex distribution network based on voltage sag information

Abstract

The invention discloses a complex distribution network fault location method based on voltage sag information. The steps of the present invention include: (1) using the fault overcurrent information reported by the feeder monitoring terminal to initially determine the fault section; (2) using the current vector information in the fault uploaded by the feeder monitoring terminal to determine the short-circuit current at the fault point; (3) using each The voltage sag information uploaded by the monitoring point and the system node impedance matrix calculate the short-circuit current of the fault point; (4) traverse each node in the system, calculate the short-circuit current deviation value, and determine the fault node. The invention realizes accurate fault location of complex distribution network. For the actual distribution network with many branch lines and complex structure, the positioning results are more accurate, not affected by branch lines, and the results are less affected by grounding resistance, load model, and fault type, which is conducive to shortening the actual distribution network faults Line inspection time, user power outage time, so as to improve the reliability index of distribution network.

Description

technical field [0001] The invention relates to power distribution automation and distribution network fault diagnosis, belongs to the field of smart grids, and in particular relates to a complex distribution network fault location method based on voltage sag information. [0002] technical background [0003] With the development of our country's economy, the requirements for power quality in all walks of life are constantly improving, and the long outage time will bring serious economic losses. According to statistics, 80% of the power outages of users are caused by the failure of the distribution network. Therefore, after the failure of the distribution network, the realization of fast and accurate fault location can shorten the downtime of the fault and provide the basis for fault isolation and recovery. , and then improve the reliability index of the distribution network. Traditional distribution network fault location methods are mostly based on the fault overcurrent i...

AI Technical Summary

Problems solved by technology

Traditional distribution network fault location methods are mostly based on the fault overcurrent information uploaded by the feeder terminal unit (FTU), using matrix algorithm or artificial intelligence algorithm to determine the fault section, this location method can only locate the fault to two feeder monitoring Between terminals, the accuracy of positioning results is not high, especially for cable lines, it still requires a long time for fault line inspection

At the same time, due to the low level of distribution automation in my country, most branch lines in the distribution network do not have feeder monitoring units installed, and are only protected by fuses, so the traditional fault location method has a small scope of application.

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