Modeling and Analyzing the Stability of an Induction Motor Drive System Using an Output LC Filter

Inhalt:
Output LC filters are commonly used to filter the high frequency harmonics induced by PWM switching. Their effect is generally disregarded, as nonmodeled dynamics are handled by control law robustness. We show that the output filter can easily be modeled and be taken into account in the control design. We provide numeric stability analysis of control laws with or without current feedback. We also prove that it is more favorable to feed back the drive current than to feed back the motor current.