Risk Assessment of a Wind Turbine Using an AHP-MABAC Approach with Grey System Theory: A Case Study of Morocco

Table 2

Rapport among wind turbine parts.

Failure category	Subsystem	Code	Failure modes (components)	Failure effect and criticality
Aerodynamic system	Blade		“Gear teeth slip”	“Incapability to regulate the angle”
			“Blade crack”	“System halts functioning”
	Hub assembly		“Error in positioning”	“Blade detach from the hub”
			“Fracture in the shell”	“Rotor breaks down”
	Tower and nacelle	.	“Fracture”	“Insecure structural integrity”
	Pitch system		“Electrical overload”	“Collapse of pitch”
			“Low insulation level”
			“Excessive loading”
	Yaw system		“Fatigue or excessive loading”	“Collapse of yaw”
Mechanical system	System brakes		“Full speed”	“Downfall of other components”
			“Over heating”	“Yaw and rotor breakdown”
	Shaft set		“Main shaft vibration”	“Parts joining vibration”
			“Main shaft malfunction”	“Shaft breakdown”
			“Fatigue cracks”	“Ruin of the system”
	Gearbox		“Gearbox vibration”	“Parts connection vibration”
			“Gearbox malfunction”	“Gearbox breakdown”
			“Gearbox abnormal noise”	“Rev of damage”
Electrical system	Generator		“Excessive fatigue”	“Failure of the generator”
			“Poor lubrication”	“Rift in shaft, rotor, bearing, and stator”
			“Overheating”	“Loss of stator and rotor”
	Converter system		“Shorting the circuit”	“In capability to transmit the energy to the transformer”
	Centralized lubrication system		“Overloading”	“Collapse of the pump”
			“Shorting circuit”	“Risk on electronic components”
	Power electrical system		“Fatigue”	“Failure of the power system”
			“Distorting”	“Collapse of the system”