Fault processing method and system for feeder automation line with distributed power supply access

Abstract

The invention discloses a fault processing method and system for a feeder automation line with distributed power supply access. The method comprises the steps: monitoring line information in real time, and removing a line fault; carrying out fault positioning and fault isolation on the fault; and judging the grid connection condition of the distributed power supply according to the fault point position and the operation mode. According to the voltage-time type feeder automation provided by the embodiment of the invention, related control logic is formulated by identifying voltage signal characteristics of a distribution line, opening, closing and locking of the section switch in a specific scene are controlled, and local isolation of a distribution network fault and power restoration of anon-fault area are realized.

Description

technical field [0001] The invention relates to the field of power feeder automation, in particular to a fault handling method and system for a feeder automation line including distributed power access. Background technique [0002] Feeder automation utilizes automated devices or systems to monitor the operating status of the distribution network, detect faults in the distribution network in time, and perform fault location, isolation, and restoration of power supply to non-faulty areas. For the automatic location and isolation of distribution network faults, it has the advantages of not relying on the master station and communication, small operation and maintenance workload, and low investment, so it has been widely used in the construction and transformation of distribution automation. [0003] However, the existing feeder automation technology route is only suitable for distribution lines without access to distributed power sources. With the development of the power indu...

AI Technical Summary

Problems solved by technology

[0003] However, the existing feeder automation technology route is only suitable for distribution lines without access to distributed power sources. With the development of the power industry, distributed power sources in distribution networks are increasing

When the distributed power supply is connected to the line, even if the penetration rate is low, the original feeder automation is difficult to apply because the distributed power supply changes the system power flow and electrical quantity, and the switch will malfunction or the switch will refuse to operate.

For voltage-time feeder automation, after the switch loses voltage and opens, the fault zone is judged and isolated by power-on step by step, but due to the existence of distributed power, even if the substation outlet circuit breaker trips, the distribution network line still exists At the power point, the voltage amplitude will not drop to 0 (decrease or increase according to the penetration rate of the distributed power supply), and the section switch on the line will not be able to execute the logic of "power failure and tripping", so that the fault cannot be isolated, and the substation will overlap The electrical characteristics of the fault are felt again after the brake, resulting in the failure of reclosing

Images