
105Simulation of Power Electronics Devices
Udc—the output converter voltage, the scope Source—the transformer primary
current and voltage, and the scope Power—the active and reactive grid powers.
By using thyristor converters, especially ones of large power, it is desirable to
limit the grid reactive power. This power is proportional to sin α. Therefore, it is rea-
sonable to use the angles α that are close to the boundary values α
min
≈ 10°–15° and
α
max
= 180° − α
min
. It can be achieved by using of the bridge control in turns, whose
gist is the following. In order to receive a zero voltage at the output of the 12-pulse
rectier E
d
, instead of ...