Feeder fault adaptive diagnosis method with high-permeability distributed power supply

Abstract

The present invention discloses a feeder fault adaptive diagnosis method with a high-permeability distributed power supply. The method comprises the following steps: the step 1: grouping the switches on a feeder, bringing the switches adjacent to the topology into the same fault diagnosis group to form a plurality of fault diagnosis groups, and collecting electrical quantity information including the fault current amplitudes and the fault current phases at the position of each switch; the step 2: when the switch at the position of any one group member in a certain fault diagnosis group triggers the over-current protection to generate fault alarm, employing an adaptive current differential algorithm to calculate the electrical quantity information of each switch in all the fault diagnosis groups, performing diagnosis whether there are faults in all the fault diagnosis groups or not; and the step 3: if there are faults in all the fault diagnosis groups, disconnecting all the switches in the fault diagnosis group; if all fault diagnosis groups have no faults, checking whether the tail ends of branch lines of the feeder is overcurrent or not, taking the downstream of the switches having the overcurrent as a fault generation area, and disconnecting the switches having the overcurrent at the tail end.

Description

technical field [0001] The invention relates to the field of intelligent distribution network, in particular to a method for self-adaptive diagnosis of feeder faults of highly permeable distributed power sources. Background technique [0002] With the increase of the penetration rate of distributed power in the distribution network, while optimizing the energy structure, it also changes the radial structure of the traditional distribution network, which brings the problem of bidirectional power flow, and the original fault protection mechanism will no longer Be applicable. At present, the feeder protection method for distributed power access mainly modifies the fault protection setting value according to the change of distributed power output at different times, but the output of intermittent distributed power sources such as photovoltaics and wind turbines fluctuates greatly, making the protection setting value need to be recalculated frequently , when the penetration rate...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a feeder fault self-adaptive diagnosis method for highly permeable distributed power, which can solve the problem of frequent recalculation of protection setting values ​​in the prior art when the output of intermittent distributed power fluctuates greatly

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