Abstract
Wind turbine has been working in the harsh environment for a long time, which leads to frequent failures. It is of great practical significance to use reasonable and efficient methods to early-warning wind turbine components. In the actual operation, due to the influence of wind turbine equipment failure and human factors, there are a large number of abnormal values in the data monitored by supervisory control and data acquisition system (SCADA). The existence of these abnormal data has a serious impact on the fault warning of wind turbine. Therefore, it is necessary to eliminate these abnormal data before using SCADA data modeling. In this paper, the 3σ-median combination method is used to preprocess the data, and then the nonlinear state estimate technology (NSET) method is used to predict the gearbox temperature of wind turbine. When the gearbox works abnormally, the residual error between the predicted value and the actual value increases, and an alarm message is sent out when the gearbox exceeds the preset threshold value. The experimental results show that the 3σ-median criterion proposed in this paper can effectively identify the outliers in the data. Then, the processed data are modeled by NSET, and the gearbox fault warning is realized by using NSET model.
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