A fault early warning method for a wind turbine gearbox

Abstract

The invention discloses a fault early warning method for a gearbox of a wind turbine. The method includes the following steps: S1. Data acquisition, acquiring data and records in the SCADA system of a wind turbine that needs early warning of a gearbox fault, and the time span should include wind power Multiple stages such as normal operation of the unit, fault formation, and fault appearance; S2, selection of wind speed, generator speed, generator active power, gearbox temperature, and historical data of the gearbox temperature at the previous moment; S3, data preprocessing, and deletion of abnormalities data, and then normalize the data; S4, use the above five parameters to establish an NSET temperature prediction model; S5, use the established NSET model to predict the gearbox temperature, and obtain the residual between the actual value and the predicted value; S6, determine the residual The difference threshold, when the residual exceeds the threshold, an alarm message will be sent. The invention utilizes the 3σ-median criterion method to eliminate abnormal values ​​in the SCADA data, greatly improving the data cleaning efficiency, and then realizes the fault early warning of the wind turbine gearbox by using the NSET method.

Description

technical field [0001] The invention relates to a fault early warning technology for a wind turbine, in particular to a fault early warning method for a gearbox of a wind turbine. Background technique [0002] There are abundant sources of operating data for wind turbines, among which the data acquisition and monitoring and control system (SCADA) equipped with the turbine itself will generate a large amount of operating data every day. Reasonable use of these information-rich SCADA data can realize fault diagnosis of wind turbines to improve The operational reliability and power quality of the unit. [0003] Nonlinear state estimation is a data-driven method, and the nonlinear state estimation modeling (NSET) method has been widely used in various aspects of the industrial field. [0004] The gearbox is a key part of the wind turbine. Its structure is complex, the design is compact, and the coupling between the components is strong. In addition, under the condition of varia...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a fault early warning method for wind turbine gearboxes to solve the problem that existing fault diagnosis methods cannot predict the state of equipment in advance

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