An overspeed detection method for a wind turbine safety chain system

Abstract

The present invention discloses an overspeed detection method and system for a wind turbine safety chain system in the field of speed detection technology. The method comprises the following steps: synchronously sampling the encoder and output signals, calculating the fused comprehensive information, and preprocessing the comprehensive information; calculating the average rotational speed by receiving pulse signals output by the encoder; obtaining a dynamic threshold by combining the average rotational speed with the standard deviation of the rotational speed; comparing the actual rotational speed with the dynamic threshold, and obtaining wind turbine operation status information based on the comparison result. This invention is based on the technical principles, signal acquisition, data fusion, and fault detection technology of incremental photoelectric encoders and inductive proximity switches.

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