Method and device for suppressing 12-pulse interference of a converter transformer based on waveform correlation coefficient

Abstract

The embodiment of the application provides a 12-pulse interference suppression method and device based on waveform correlation coefficient, and relates to the technical field of transformer monitoring. The method first collects current signals at the core and the grounding wire of the clamping piece of the converter transformer by using a wideband current sensor, and performs mean removal processing on the current signals; then all pulse signals in the current signals are extracted; then 12 signals without discharge pulses are continuously selected from the extracted pulse signals as reference signals; after signal alignment, the correlation coefficients between the pulse signals and the 12 reference signals are calculated respectively, and a correlation coefficient vector is obtained; finally, a correlation coefficient threshold is set, and the 12-pulse interference signals are removed by comparison. The method can realize 12-pulse electromagnetic interference suppression of the converter transformer, provides important support for state evaluation of the converter transformer, and has good practical value.

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