System and method for positioning medium voltage distribution network using power line carrier communication

Abstract

The invention discloses a system and a method for positioning a medium voltage distribution network using power line carrier communication. The system comprises a plurality of nodes, and each node has number and fault information; and the system also comprises a carrier communication network connected with the nodes and a host controlling and processing system connected with the carrier communication network. The method comprises the following steps of: inputting, acquiring, judging whether a zero sequence voltage is greater than a threshold value, judging whether a fault exists and whether the fault is a false grounding fault, judging a neutral point grounding mode and positioning fault points by adopting different methods for positioning fault zones. The system uses the power line carrier communication technology as main means of fault information transmission and distribution network communication, has the advantages of economy, practicability, strong adaptability, simple channel maintenance and high reliability, has openness and compatibility, can be used as a common channel by each distributed automatic subsystem, meets various demands of distribution network management, greatly reduces the investment, and accurately positions the fault points through least square.

Description

technical field [0001] The invention relates to a medium-voltage distribution network positioning system and method, in particular to a medium-voltage distribution network positioning system and method using power line carrier communication. technical background [0002] The medium-voltage distribution network mostly has mixed lines of overhead lines and cables, as well as branch lines. The network structure is complex, and most of the line faults are single-phase ground faults. In the small current grounding operation mode, due to the weak current of single-phase ground fault (commonly known as small current ground fault), the system can run for a period of time after the fault occurs. Therefore, the small current grounding operation mode can significantly improve the reliability of power supply, and also has The advantage of less interference to the same-sex system. But long-term operation with faults, especially when there are intermittent arc-flash ground faults, overvo...

AI Technical Summary

Problems solved by technology

In view of the characteristics of the small current grounding system, when subjected to electromagnetic interference and harmonic pollution, the signal may be distorted, affecting the reliability and accuracy of various selection principles

At present, most detection methods are only theoretically feasible, and there are great difficulties and limitations in practical application.

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