Table 1.

Parameters of the considered HTGS.

Parameter	Value
$T_{j2}$(Time constant of upstream surge tank)	475.948(s)
$T_{j4}$(Time constant of downstream surge tank)	2500(s)
$T_{w1}$(Time constant of diversion tunnel)	3.220(s)
$h_{f1}$(Relative head loss of diversion tunnel)	0.026
$T_{w3}$(Sum of the time constants of penstock and draft tube)	0.82(s)
$h_{f3}$(Relative head loss of the pipe)	0.010
$T_{w5}$(Time constant of tailrace tunnel)	0.26(s)
$h_{f5}$(Relative head loss of tailrace tunnel)	0.015
$T_y$(Time constant of servo-mechanism system)	0.2(s)
$T_a$(Time constant of synchronous generator-motor)	8.5(s)
$e_x,e_h,e_y$(Transfer coefficients of turbine)	−1.000,1.500,1.000
$e_{\mathit{qh}},e_{\mathit{qy}},e_{\mathit{qx}}$(Transfer coefficients of turbine)	0.5,1.000,0
$e_g$(Self-regulation factor of synchronous generator-motor)	0.210