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This paper attempts to present a concise review of the research done around fault detection methods for IMs. Various methods to diagnose faults researched over past few years are reviewed and presented with the focus on state-of-the-art fault diagnosis that use on-line (while the machine is running) and non-intrusive (without requiring sensors) techniques. The speed and accuracy of the fault diagnosis...
This paper presents a study of the wind turbine in normal and faulty situation. In the latter, suitable residual generation is performed to detect and isolate three sensor faults in the wind turbine system. The study was conducted on FAST coded simulator, designed by the US National Renewable Energy Laboratory's National Wind Turbine Center. The obtained results provide a good fault detection and...
The number of doubly fed induction generators (DFIG) connected to the existing network has increased significantly worldwide during the last two decades. The stator in DFIG is directly connected to the grid whereas the rotor is interfaced to the grid through two voltage source converters; rotor side converter (RSC) and grid side converter (GSC), which are considered as the crux of the DFIG system...
Fault indicators signifying major failures in Synchronous machines (SM) are highlighted. A 15 megawatt (MW) SM was chosen in which, electro-mechanical faults were made by suitably altering physical disposition of machine parts. Finite element simulation of the motor model helped build signature for ideal and fault conditions in time and frequency domains for different fault indicators. Measurements...
Relationships between shaft voltages and static eccentricities are studied, theoretical analysis shows that shaft voltages are induced by the ‘distorted fluxes’ caused by static eccentricities, shaft voltages mainly contain odd harmonics, the harmonic amplitudes increase under greater eccentricities. Some new distorted flux hamonics appear when field windings interturn short circuit happens, the harmonic...
Paper describes an online diagnostic and control unit which can control, diagnose and partially do the prognosis of EV drive. For the EV drive control is used a vector control. Methods of processing the variables are based on fault analysis of rotating systems according frequencies at current spectra of EV induction motor. Moreover, unit can detect short circuits and monitor a partial discharge activity...
This paper presents the results obtained from a PSCAD/EMTDC dynamic fault simulation of a grid connected Doubly-fed Induction Generator (DFIG). The transient stability performance of the DFIG is investigated; case studies which demonstrate the possibility of wind turbine generator torsional vibration, and the concept of Critical Clearing Time (CCT) for the DFIG are presented and the results are compared...
In this work we present a new techniques to detect a mechanical faults in asynchronous machines by exploiting the instantaneous frequencies estimated starting from an accelerometer sensor, optical encoder and stator current. Bearing damages cause a torque oscillations as well as a disturbance in the velocity signal which can be detected by a mechanical measurements. These fluctuations will be reflected...
This paper describes the effect of wind turbine mechanical characteristic of construction and grid parameters on the transient voltage stability of a fixed speed wind turbine (FSWT) connected to a simple grid. The model of FSWT has been developed in Matlab/Simulink. Using this model, a three-phase fault is applied close to the wind turbine (WT) and cleared by disconnecting the faulted line. The effects...
This paper describes the effect of electrical parameters of the induction generator on the transient voltage stability of a fixed speed wind turbine connected to a simple grid; the dynamic behavior of a wind turbine connected to the grid is examined. The model of the fixed speed wind turbine has been developed in the simulation tool Matlab/Simulink. Itpsilas composed by the induction generator, the...
An efficient condition monitoring system is indispensable to a large offshore wind turbine (WT) as it suffers higher reliability risk being exposed to extreme running environment and subject to constantly variable loadings, however difficult to access for fault repair. Today, the majority condition monitoring techniques for WT are borrowed from other industry fields where they achieve success. However,...
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