Parameters	Description	Unit
$θ_{w t r}$	Low speed shaft angular position	rad
$θ_{g e n}$	High speed shaft angular position	rad
$Ω_{w t r}$	Angular speed of WT rotor (the low speed shaft)	rad/s
$Ω_{g e n}$	Angular speed of the generator (high speed shaft)	rad/s
$T_{w t r}$	Wind turbine rotor torque	N・m
$T_{g e n}$	Generator torque (Electromagnetic torque)	N・m
$T_{s h a f t}$	Internal shaft torque	N・m
$D_{s h a f t}$	Shaft damping coefficient	N・m・s/rad
$K_{s h a f t}$	Shaft stiffness	N・m/rad
$J_{w t r}$	Wind turbine rotor inertia	kg・m²
$J_{g e n}$	Generator inertia	kg・m²
$i_{d s}, i_{q s}$	The stator currents in dq components	A
$i_{d r}, i_{q r}$	The rotor currents in dq components	A
$V_{d s}, V_{q s}$	The stator voltages in dq components	V
$V_{d r}, V_{q r}$	The rotor voltages in dq components	V
$ψ_{d s}, ψ_{q s}$	The stator flux linkages in dq components	Wb
$ψ_{d r}, ψ_{q r}$	The rotor flux linkages in dq components	Wb
$ω_{s}$	The synchronous speed	rad/s
$P_{p}$	The Number of machine pole-pair
$L_{m}$	Magnetizing (mutual) inductance	H
$L_{l s}$	Stator leakage inductance	H
$L_{l r}$	Rotor leakage inductance	H
$L_{s}$	Stator self-inductance	H
$L_{r}$	Rotor self-inductance	H
$σ$	The total leakage coefficient
$R_{s}$	Stator winding resistance	Ω
$R_{r}$	Rotor winding resistance	Ω