Fault Reconstruction of Wind Turbine Actuator System Based on Sliding Mode Observer

doi:10.3901/JME.2021.14.261

Abstract

Abstract: The finite time reconstruction of the fault of the transmission system, generator and pitch system of the wind turbine and the accurate acquisition of the pneumatic torque in practical application are discussed. A new adaptive nonsingular terminal sliding mode observer is proposed. An adaptive law is introduced into the observer to ensure that the sliding mode observer is not affected by unknown disturbance. The proposed non-singular sliding mode surface can effectively solve the chattering problem of the conventional sliding mode observer, avoid the problems of fault misjudgment and missing judgment caused by chattering phenomenon, and improve the efficiency of fault diagnosis. Aiming at the fault of variable propeller system, the hydraulic pressure drop model of pitch actuator was transformed into additive fault by introducing fault indication parameters. Then, two cascade sliding mode observers are used to observe the pitch system, and the finite time state estimation and fault reconstruction are given. Finally, the simulation results verify the finite time estimation of the wind turbine state and the fault reconstruction of the actuator, and achieve the goal of fast fault diagnosis of the wind turbine. The correctness and feasibility of the proposed method are proved.

Key words: wind turbine, nonsingular terminal sliding mode observer, adaptive, cascade sliding mode observer, stability analysis, fault mode, fault reconstruction

CLC Number:

TH113

WANG Hao, HAO Wanjun, LI Ze, CUI Guozeng, WU Yu, ZHANG Zhengfu, SUN Zhihui. Fault Reconstruction of Wind Turbine Actuator System Based on Sliding Mode Observer[J]. Journal of Mechanical Engineering, 2021, 57(14): 261-269,281.

References

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