Bus Voltage	$V_{d c} < V_{d c r e f}$	$V_{d c} > V_{d c r e f}$
Flywheel Speed	$V_{d c} < V_{d c r e f}$	$V_{d c} > V_{d c r e f}$
$ω > 1.1 pu$	Reduce the speed, release the energy	Limit current speed at 1.1 pu
$1.1 pu > ω > 0.1 pu$	Reduce the speed, release the energy	Increase the rotational speed and absorb the energy
$ω < 0.1 pu$	Limit current speed at 0.1 pu	Increase the rotational speed and absorb the energy