| The imbalance fault as a high proportion in all wind turbine faults. Compare with the traditional fault detection methods, using input aerodynamic torque to detect imbalance fault has many advantages like implementation and system reliability. However, using aerodynamic torque changes from energy transmission process to detect the imbalance fault has challenges in practical parts. This paper proposes a novel method of using order analysis to analyze the signal of input aerodynamic torque which is received by hub. After the analyzed process, the fault characteristic frequency could be extracted by the analyzed signals and compare with the signal from normal working conditions. By analyzing and reconstructing fault signal, it is easy to detect the fault characteristic frequency and see 1P and 3P frequency distinctly. This method is not usual in double-fed wind turbines and it is effective to fill the gap of blade fault detection of double-fed wind turbines. |
