
38-56 Power Electronics and Motor Drives
38.8.1.3 The Indirect Current Control Technique of SAPF
In the indirect current control technique, the switching signals for SAPF devices are obtained by com-
parison of reference (
,
and
) and sensed (i
s1
, i
s2
and i
s3
) source currents [19,20]. e d and q axes
reference supply currents are expressed as follows:
i i I
i
sd d cm
sq
*
= +
=
*
0
(38.81)
e block diagram of the indirect current control of active lter is shown in Figure 38.70.
38.8.2 Control Technique Principle
e inverter control technique uses the B-PWM principle. e control signals (β
i
, i = 1,2,3 and −1 < β
i
< 1,
see Figure 38.73) are ...