Direct Torque Control with Space Vector Modulation (DTC-SVM) of ...

Direct Torque Control with Space Vector Modulation
As an example the calculated response for 4 samples are given:
n
∑
k = 0
f kT az az a a az
−2 −3 −4
(
s
) = + 2 − (1 + ) + 2 + .......
which gives:
f(0) = f( k) = 0
f(1 T ) = f( k+ 1) = 0
s
f(2 T ) = f( k+ 2) = a=
0.2688
s
f(3 T ) = f( k+ 3) = a( b+ 1) = 2a=
0.5376
s
f T f k a b c a b a a a
2
(4
s
) = ( + 4) =− ( + ) + ( + 1) =− (1 + ) + 2 = 0.7342
Keeping constant
C Ψ d
in equation (5.57) the flux step response for different sampling time
T
s
= 50 µ s,
100 µ s,
200 µ s,
400µ s , which correspond to switching frequency f s
= 20kHz,
10kHz, 5kHz, 2.5kHz are presented.
1
2
3
4
Figure 5.31.Flux step response for different sampling time T
s
= 50 µ s,
100 µ s,
200 µ s,
400µ
s
(switching frequency f
s
20kHz (1 -blue line), 10kHz (2 -green line), 5kHz (3 -red line),2.5kHz
(4 -light blue line).
We may observe from Fig. 5.31 that overshoot is 0% and the settling time is 10 samples.
Selected parameters of PI flux controller for sampling time T s
= 50 µ s,
100 µ s,
200 µ s,
400µ s are summarized in Table 5.3
95