Method based on topology protection of distributing network

Abstract

The invention discloses a method based on the topology protection of a distributing network, which comprises the following steps: (1) all distributing automation terminals respectively form a distributing network topology structure, and each distributing automation terminal is linked with adjacent nodes in a lateral communication mode; and (2) whether each switch is an adjacent node is judged based on a line failure criterion; if yes, the network topology protection corresponding to the switch is activated to trip the switch of the node; and otherwise, the network topology protection is not activated, wherein the line failure criterion is as follows: if the switch is not a transformer substation outlet switch and a line overcurrent failure is detected in one and only one of N adjacent nodes, the fact that the switch is a failed adjacent node is judged; and if the switch is a transformer substation outlet switch and a line overcurrent failure is detected in one and only one of N nodes including the transformer substation outlet switch, the fact that the transformer substation outlet switch is a failed adjacent node is judged. The method can rapidly, accurately and selectively position the failure and isolate the failure.

Description

technical field [0001] The invention is used for the troubleshooting method of feeder automation in the field of distribution automation. Background technique [0002] The existing feeder automation schemes that can be applied to actual projects mainly include: master station (substation) centralized scheme, voltage-time scheme. [0003] The master station (substation) centralized scheme means that the distribution automation terminal provides an overcurrent fault signal to the master station (substation). Make a judgment before starting the fault isolation operation. This process generally requires staff to confirm, resulting in low efficiency; in addition, this kind of feeder automation scheme must rely on the cooperation of the main station (substation) and the distribution automation terminal. [0004] Although voltage-time feeder automation can realize localized fault judgment and isolation, it has special requirements for the system grid structure and is mainly applic...

AI Technical Summary

Problems solved by technology

[0003] The master station (substation) centralized scheme means that the power distribution automation terminal provides overcurrent fault signals to the master station (substation). Make a judgment, and then start the fault isolation operation. This process generally requires staff to confirm, resulting in low efficiency; in addition, this kind of feeder automation scheme must rely on the cooperation of the main station (substation) and the distribution automation terminal.

[0004] Although voltage-time feeder automation can realize localized fault judgment and isolation, it has special requirements for the system grid structure and is mainly applicable to "hand in hand" overhead lines. Reclosing is generally not allowed for cable lines; in addition, switches require It has the function of splitting without voltage, and the switch with this feature can only be manufactured by a very limited number of manufacturers, and the price is relatively expensive compared with ordinary switches; moreover, the accurate location of the fault requires multiple overlaps of the feeder switch in the substation, which has a great impact on the system , the power outage lasts for a long time, and may cause the fault range to expand

[0005] To sum up, the aforementioned commonly used feeder automation schemes must gradually locate and isolate the fault area after the substation feeder switch protection trips and the entire feeder line is blacked out. The power outage range is large, and the judgment and isolation process takes a long time, which needs to be improved.

Images