
Three-Phase AC–DC Converters 11-21
With these assumptions, the line voltage can be estimated by summing rectier’s voltage with volt-
age drop across inductors. e calculation of voltage drop across the inductance can be done by, as
described in previous section, dierentiation of current or estimation based on the power theory [6]:
u u u
Line
S L
*
.= +
12
(11.42)
In the case of lter-capacitor voltage estimation, calculations are realized in a similar way, but the recti-
er’s voltage is summed with only voltage drop across inductance L
1
[22]:
u u u
C S L
= +
1
. (11.43)
Taking in account (11.43) through (11.45):
p L
di
dt
i
di
dt
i
di
dt
i
L
La
La
Lb
Lb
Lc
Lc1 1