An improved scheme for extended power loss ride-through in a voltage source inverter fed vector controlled induction motor drive using a loss minimisation technique

Critical production processes in industry require the drives to smoothly ride-through during momentary power interruptions. This paper presents a method to extend the duration of the ride-through for VSI-fed vector controlled induction motor drives with a front end diode bridge rectifier. The proposed method minimises the losses in the system during the ride-through thereby enabling a longer ride-through duration. It requires only modification of the control software and hence is easy to implement. Hardware implementation of the method on a 30 kW induction machine indicates an extension of upto 34 % in the ride-through time by minimising the losses.