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Modeling of converter-fed motor drives for analyzing motor transients

The present work investigates how the components in a complex system of frequency converter, transformer, cable and motor can be modeled. Different models for the components of the system have been evaluated in order to find the best ones for analyzing the voltage stresses in a motor supplied by a PWM frequency converter. The aim is to dimension the individual components to optimize the whole system. The work is based on frequency domain analysis to detect critical harmonic frequencies, and transient- and steady-state analysis in the time domain. The developed models are valid for systems with long- as well as for shorter cable lengths, and for both VSI and CSI converters.