A regional differential protection method applied to feeder automation

Abstract

The invention discloses a regional differential protection method applied to feeder automation, and relates to the fields of smart grid and distribution automation. At present, the conventional feeder has the problem of multiple power outages and resets for non-faulty path users. The invention includes the steps of: confirming the synchronization of communication; confirming the validity of communication, after confirming the synchronization of the communication of the unit, confirming the validity of the communication on the latest sampling point number; calculating the analog quantity data; . The technical solution solves the defects of the conventional FA. When the power distribution line fails, it will not cause the power outage of the entire line, and avoids multiple power outages and restoration impacts to the users of the non-faulty path in the process of fault isolation and power supply restoration. It solves the problem of distribution network protection coordination under the environment of ring network structure and distributed power supply access. The application object is no longer limited to the single-radiation network, and can be applied to the power distribution primary grid of any complex ring network structure, with a wide range of applications.

Description

technical field [0001] The invention relates to the field of smart grid and distribution automation, in particular to a regional differential protection method applied to feeder automation. Background technique [0002] Feeder automation (feeder automation) is the basis of distribution automation (DA) and the core content of distribution automation. At present, the feeder automation projects that have been implemented in my country are generally aimed at single-radiation networks. Even if the primary distribution grid has a ring network structure, in actual operation, the open-loop operation mode is used to disconnect the tie switch. Therefore, when implementing the construction of the feeder automation project, it is still designed according to the single-radiation network. On the one hand, realizing the power transfer function through feeder automation is one of the main purposes of feeder automation. The violation of the design and transformation purpose of the primary ...

AI Technical Summary

Problems solved by technology

[0006] (1) When a fault occurs, the outlet switch of the substation trips, causing a power outage on the entire line

For in-situ feeder automation, it is also necessary to set the reclosing function for one to three times on the outlet circuit breaker of the substation. During the process of fault isolation and power restoration, it will cause multiple impacts on the line, and users on non-faulty paths will also experience multiple stop and reset. Electricity

[0007] (2) Conventional feeder automation is a technical solution developed for single-radiation networks. When it is applied to a distribution grid with a ring network structure, it is necessary to disconnect the contact switch and adopt an open-loop operation mode, resulting in investment in distribution automation construction. waste of

[0008] (3) For multi-connection lines, when the operation mode is changed, in order to ensure the correct operation of the feeder automation, the protection setting value needs to be adjusted, especially for the multi-branch line with sectionalizer on the branch, the adjustment of the protection setting value is very complicated

Furthermore, for the distribution network under the environment of distributed power access, the traditional protection will be invalid or insensitive due to the injection of DG, or the adjustment of the protection setting value will become impossible

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