研究目的
To solve the problem of dynamic response slowdown of the pitch angle when the pitch actuator of wind turbines fails, leading to fluctuations in the generator speed and output power, by proposing a fault-tolerant control combined with fault estimation.
研究成果
The fault-tolerant control strategy combined with the SDW-LSI algorithm adequately handles faults in the pitch actuator. The fluctuations of the pitch angle and the generator speed are eliminated accordingly; the system behavior with active fault compensation is similar to the behavior of the fault-free case.
研究不足
The study only involved a simulation experiment; further different simulation models and practice verification are necessary. The next research task is to design an active FTC method to handle a variety of fault types appearing simultaneously.
1：Experimental Design and Method Selection:
The study transforms the simplified two-order transform function of the pitch actuator into the identification equation using the Euler transformation method. It then estimates the time-varying natural frequency and damping ratio of pitch actuators using the SDW-LSI identification algorithm.
2：Sample Selection and Data Sources:
The study considers faults in the pitch actuator caused by a bad running environment and random variation wind speed, specifically the fault of high air content in the hydraulic oil.
3：List of Experimental Equipment and Materials:
Not explicitly mentioned in the provided text.
4：Experimental Procedures and Operational Workflow:
The sliding data window length is adjusted when changes in system parameters are detected. A compensation equation is derived in the pitch actuator, and the estimated values are fed back to the compensation module.
5：Data Analysis Methods:
The SDW-LSI algorithm is used for parameter estimation online when the pitch actuator fails.
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