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

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

Date3rd Oct 2023

Time03:00 PM

Venue ESB 244

PAST EVENT

Details

In Voltage Source Inverter (VSI) based applications, a blanking time (or) dead time is introduced between the two switches of the inverter leg to avoid a DC bus shoot through fault. Since this dead time is a protective feature and cannot be avoided, the associated effects and the ways to compensate for it have been widely studied. The dead time is an added non-linearity in a VSI apart from the already existing on-off time delays and propagation delays in the pulse width modulated (PWM) output. The seminar talk focuses on a current ripple prediction based dead time compensation scheme for a three phase two-level Voltage Source Inverter (VSI) fed Induction Motor drive. The impacts of inverter output current ripple on the application of a suitable dead time compensation is analysed and a simplified / 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 the delays in the output generated from the digital controller with respect to the implementation of dead time compensation (DTC) is further probed. The results of the current ripple prediction based DTC scheme and the conventional DTC scheme are compared and presented under different scenarios.

Speakers

Arjun Sarathy Narayanan (EE16D411)

Electrical Engineering