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

Direct Torque Control with Space Vector Modulation
The behavior of the torque control loop was tested using SABER simulation package.
The model created in SABER takes into account the whole control system, which
include real models of inverter and permanent magnet synchronous motor.
The torque step response is shown in Fig. 5.44, 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 5.44. 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). Pleas note that for 2.5kHz the system was unstable.
After modification of PI flux controller parameters according to Table 5.4 it is possible
to achieve better results as shown in Fig. 5.45, what confirms proper torque tracking
performance in steady and dynamics state.
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