
110 Electrotechnical Systems
current and the inverter denes the voltage. When α
min
is reached, the functions of
the rectier and the inverter change mutually: the rectier denes the voltage and
the inverter the current. Instead of the angle γ control, the inverter can have the input
voltage control.
The current regulator includes additional features: the limitation of line maximal
current, the limitation of the line minimal current, and decreasing of the maximal
current while there is a decrease in the AC voltage or the rectier voltage. In order
to prevent moving the inverter to the rectier mode by reversing the power transmis-
sion direction ...