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

Direct Torque Control with Space Vector Modulation
The torque step response is shown in Fig. 5.23, when parameters of PI torque controller
designed for sampling time T s
= 200µ s were used for control plant for different sampling
times
T
s
= 50µ s , 100µ s , 200µ s , 400µ s , which correspond to switching frequency f s
=
20kHz, 10kHz, 5kHz, 2.5kHz.
Figure 5.23. Torque tracking performance for different sampling time T s
= 50µ s , 100µ s , 200µ s ,
400µ s ( f
s
= 20kHz, 10kHz, 5kHz,2.5kHz) using parameters of PI controller designed for
T
s
= 200µ s ( f
s
= 5kHz). (Please note that for 2.5kHz the system was unstable).
After modification of PI torque controller parameters according to Table 2 it is possible to
achieve better results as shown in Fig. 5.23, what confirms and proper torque tracking
performance in steady and dynamics state.
Figure 5.24. Torque tracking performance for different sampling time T
s
= 50µ s , 100µ s , 200µ s ,
400µ s ( f
s
= 20kHz, 10kHz, 5kHz,2.5kHz) using designed parameters of PI controller calculated
individually (see table 5.2)
87