Internal electrical fault detection techniques in DFIG-based wind turbines: a review

Protection and Control of Modern Power Systems

Table 2 A comparison among different techniques used to detect DFIG rotor faults

References	Techniques	Advantages	Limitations
[71]	Magnetic equivalent circuit	High accuracy	Affected by the geometry of the machine
[76,77,78,79, 84, 88, 95, 97, 98]	Fourier analysis	High accuracy	Affected by the change of speed and torque
[81, 82, 89, 90, 96, 100, 102]	Wavelet analysis	High accuracy	Time consuming
[74, 75, 85]	Coupled-circuit	On-line	Affected by the geometry of the machine
[86, 87, 99]	Luenberger observer	Reduced computation time	Sensitive to any abnormality
[91,92,93]	Sequence component	On-line	Unable to detect the fault location
[101]	Support vector machine	Robust	Require expert opinion
[105, 106]	Power spectrum	Discriminate load oscillation	Applicable to low-frequency oscillation
[94, 107, 108]	Magnetic flux	Identify fault location	Requires additional sensors
[109, 110]	Vibration	On-line and simple	Requires additional sensors