An Investigation of Current Ripple Prediction Based Dead Time Compensation Using a Simplified Motor Model for a VSI fed Induction Motor Drive

In this paper, current ripple prediction based dead time compensation for a three phase two-level Voltage Source Inverter (VSI) fed Induction Motor drive is attempted. A simplified and computationally light Induction Motor model is used to predict the high frequency current ripple. The current ripple output from the inverter is analysed under different operating conditions and a dead time compensation scheme based on the simplified high frequency motor model is implemented. A triggered simulation model that mimics the actual digital controller implementation is used for the study. The impacts of delays in the output generated from the digital controller with respect to the implementation of dead time compensation (DTC) is further studied in simulation. The results of the current ripple prediction based DTC scheme and the conventional DTC scheme are compared and studied under different scenarios.