Condition monitoring and fault diagnosis of a wind turbine synchronous generator drive train

Failure Mode Identification and End of Life Scenarios of Offshore Wind Turbines: A Review

“…Identifying the ways that a WT can fail is the first stage of the risk management process which will constitute the base of work on future life extension processes, making it a feasible practice. Premature brake activation [21] Unsteady performance [28] Increased torque pulsation [18,31] Inability of excessive operational load mitigation [35] Corrosion [28] Excessive heating in the winding [18] Operation instability due to hydraulic system failure [36] Gearbox (bearings and gears) Ref Increase in losses and efficiency reduction [31] Air contamination in the hydraulic system [37] Gear tooth damage [38] Rotor misalignment [39] Inability of aerodynamic braking [35] Pitting [38] Imbalances and harmonics in the air gap flux [18,40] Hydraulic fluid bulk modulus reduction [37] Cracking [38] Shorted winding coil (reduction in generator reactance) [29] Leakage in the hydraulic system [37] Gear eccentricity [29] Tower and Foundation Ref …”

Final Technical Report Recovery Act: Online Nonintrusive Condition Monitoring and Fault Detection for Wind Turbines

“…Measurements that contain the information on wind turbine physical conditions are continuously taken from sensors. These measurements are then evaluated to determine the condition of wind turbines by using appropriate system analysis and signal processing techniques, such as spectrum analysis [19]- [22], wavelet analysis [23]- [25], statistical analysis [26], [27], pattern recognition, envelope curve analysis [28], [29], or neural networks [30]. The use of additional sensors and data acquisition devices increases the cost and hardware complexity of wind turbine systems.…”

Review of fluid and control technology of hydraulic wind turbines

“…The selfexcitation characteristic of the multi-level PMSG enables a system to maintain high efficiency under high power. Thus, the multi-level PMSG is generally considered the ideal choice for variable-speed wind power generation [1][2][3][4][5][6][7][8][9]. However, hydraulic wind turbines present unique advantages in terms of the efficiency and reliability of wind power.…”