Fault Location Method of Secondary Virtual Circuit Based on Differential Approximation Reasoning of Fault Area

Abstract

The invention discloses a secondary virtual circuit failure locating method based on differential approximate reasoning of a failure area. The secondary virtual circuit failure locating method comprises the following steps: at first, carrying out virtual link and physical link modeling on a process layer network connection of a "net sampling and net hopping " or "point sampling and net hopping" intelligent substation, and carrying out association mapping configuration on a virtual link and a physical link; using a directed graph theory to carry out model abstraction on the process layer network connection of the intelligent substation, and abstracting to obtain a directed connected graph; and then, according to communication link abnormality information sent by a receiving side, when receiving failure of the virtual link, starting a failure diagnosis locating system, judging the on-off state of the virtual link to continuously iterate a difference set of the physical link for loading the connected virtual link and the disconnected virtual link, and locating a physical link failure point position causing the failure of the virtual link. The secondary virtual circuit failure of the intelligent substation is monitored, judged, diagnosed and located to assist an operation and maintenance staff to quickly find the failure, remove the failure and recover the normality, so as to guarantee the safe and reliable operation of a power grid.

Description

technical field [0001] The invention relates to a fault location method, in particular to a secondary virtual circuit fault location method based on fault region differential approximation reasoning, and belongs to the technical field of power system automation. Background technique [0002] The secondary circuit of the smart substation is no longer a pure circuit structure composed of a single signal transmitted by a cable, but a networked structure based on optical fiber digital communication. Each optical fiber transmits multiple signals at the same time, and it is no longer possible to directly connect them from the outside. The physical connection is used to analyze the entire circuit, and the secondary virtual circuit is replaced. How to monitor the secondary circuit and how to quickly locate the fault point when the circuit fails are urgent problems to be solved in the construction of smart substations. [0003] At present, the monitoring function of the virtual circ...

AI Technical Summary

Problems solved by technology

But in fact, the receiver cannot directly judge which link of the link has a problem, because the optical fiber interface of the sender, the communication link, or the optical fiber interface of the receiver may all be abnormal.

In addition, due to the complexity of the communication link, a large number of alarm messages are often generated; these messages are based on the judgment of each device itself, and it is difficult for the operation and maintenance personnel to quickly and accurately locate the fault in the face of these scattered and local alarms point and take action as soon as possible

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