**Author details**

(1) The reliability research based on the fatigue life.

184 Stability Control and Reliable Performance of Wind Turbines

reliability of components and subassemblies.

sidering the influences of waves and the sea wind.

operating efficiency of wind turbines sharply.

Research and Innovation Project (CYB16024).

data.

**Acknowledgements**

(3) Reliability research based on the whole wind turbine's dynamics.

The fatigue failure is the common failure modes of wind turbines. It needs to study the whole wind turbine fatigue life and reliability. With design parameters and the dynamic model, the failure correlation of key components is calculated. Following this, matrixes of loads and contact stresses can be calculated considering the operation environment of wind turbines. Finally, it is possible to produce the fatigue cumulative damage of key components.

(2) The gradual change mechanism and physical representation of component health status.

Combining loads and fault statistical data, the gradual change mechanism of health status needs to be studied with the function of key components and mechanism characteristics, and to seek the physical representation that is related to the component health status. This is helpful to develop the trend model and thresholds of the physical representation of fault status. Following the abovementioned method, it is possible to assess and pre-estimate the

Considering the influences of the random wind speed and waves, the dynamic model is established including components from blades to the foundation, by which the dynamic reliability of the wind turbine structure and drivetrain is studied. Following this, it is possible to evaluate the dynamic reliability of the whole wind turbine. However, the current reliability research ignored the influences of waves on the foundation and the tower, which would bring big errors to the reliability research. Therefore, it is essential and urgent to develop a set of the reliability engineering model and test method of wind turbines con-

(4) Remote real-time assessment system of the wind turbine reliability based on the fusion

It is clear that most wind turbines have been installed both SCADA and CMS, but they are independent and cannot achieve the mutual support of test results. Therefore, it is meaningful to mix two sets of the test data based on SCADA and CMS. Following this, the feature data can be extracted and transferred to the data center by the Internet. When the feature data reach the data center, they can be used to calculate and assess the dynamic reliability of wind turbines through engineering models and hardware and software equipment immediately, which will cut the operation and maintenance cost and improve the

The authors wish to acknowledge the financial support from the Innovation Project of the City of Chongqing (cstc2015zdcy-ztzx70012, cstc2015zdcy-ztzx70010) and Chongqing Graduate Caichao Zhu\* and Yao Li

\*Address all correspondence to: cczhu@cqu.edu.cn

The State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing, China
