
11-16 Power Electronics and Motor Drives
11.2.6 Direct Power Control–Space Vector Modulated
e DPC-SVM with constant switching frequency uses closed-loop power control, what is shown in
Figure 11.11a [13,17]. e commanded reactive power q
ref
(set to zero for unity power factor operation)
and (delivered from the outer PI-DC voltage controller) active power p
ref
(power ow between the sup-
ply and the DC-link) values are compared with the estimated q and p values (Equations 11.33a and b),
u
La
u
Lb
L
u
Lc
L
p q
γ
ΨL
i
La
D
a
D
a
+
PWM rectifier voltage estimation block Virtual flux estimation block Active and reactive power estimation block
2
3
+
+
+
–
–
–
+
arctg
+
+
–
ω
q