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

DSP implementation of DTC-SVM control
Figure 7.9. Experimental steady state operation of PMSM controlled via DTC-SVM with the
encoder speed signal taken to the feedback ( Ω = 1500rpm
, M = 10Nm
-50% of nominal
torque). From the top: 1) amplitude of stator flux (0.25Wb/div), 2) electromagnetic torque
(10Nm/div), 3) line to line voltage (1000V/div), 4) stator phase current (10A/div).
m
l
7.3 Dynamic behaviour
The experimental results of flux and torque control loop obtained in dynamic states for
PMSM machine controlled via two different DTC-SVM schemes are presented.
7.3.1 Flux and torque control loop
Cascade DTC–SVM control scheme (Fig. 5.46a)
In order to show behaviour of the system the dynamic testes for the flux and torque
controllers has been carried out for sampling time, T = 200µ
s. It corresponds to
switching frequency f = 5kHz
. Please note that the flux digital controller parameters
s
were selected according to Table 5.1 and the torque digital controller parameters were
selected from Table 5.2. (see Chapter 5.2).
In Fig. 7.10 stator flux tracking performance is presented. This result is comparable
with simulation results presented in Fig. 5.15.
s
143