An Adaptive Filtering Algorithm Based on State Recognition for Relay Protection

Abstract

The invention discloses a relay protection adaptability filter algorithm based on state recognition, comprising step 1, acquiring, by an acquisition system, voltage data of relay protection equipment; step 2, preprocessing the acquired voltage data; step 3, calculating a time domain characteristic parameter of the preprocessed voltage data; step 4, comparing the time domain characteristic parameter with a threshold, and selecting a different filter method according to the comparison result to filter the voltage data; and step 5, outputting the filtered voltage data. State recognition can be performed on the relay protection equipment, and corresponding filter algorithms are adopted for different states, so that the problem that the single algorithm for the relay protection equipment is difficult in being compatible with various conditions is solved, the influence of electromagnetic interference is greatly reduced, and inaccuracy of relay protection equipment acquisition data is avoided.

Description

technical field [0001] The invention relates to an adaptive filtering algorithm for relay protection based on state identification, and belongs to the field of filtering algorithms for relay protection equipment in substations. Background technique [0002] As an important node in the smart grid, the smart substation collects the status of the substation equipment and the operation information of the power grid, supports real-time control of the power grid, intelligent regulation and various advanced applications, and realizes the coordinated operation of the substation. Compared with the traditional substation, the smart substation moves the secondary equipment data acquisition equipment that should have been placed in the relay room to the primary equipment area, and the data acquisition equipment is weak current equipment, which is extremely vulnerable to the electromagnetic environment in the primary area of ​​the substation. When the substation suffers from lightning st...

AI Technical Summary

Problems solved by technology

When the substation suffers from lightning strikes, switch operations and short-circuit faults, the measurement signals of relay protection equipment are susceptible to transient electromagnetic disturbances, which affect the measurement accuracy of voltage data. It is necessary to filter out interference signals through filtering algorithms

[0003] At present, the relay protection equipment of the substation adopts a single filtering algorithm. For different operating states, the same algorithm is adopted, and the algorithm cannot be adjusted according to the operating state of the relay protection equipment, which lacks effectiveness and pertinence.

Due to the complex electromagnetic environment of the substation, the different operating states of the relay protection equipment are very different. If the same filtering algorithm is used, the filtering effect is not ideal, and the influence of electromagnetic interference on the relay protection equipment cannot be filtered directly, effectively and quickly.

Images