CONTROL OF HIGH SPEED MOTOR DRIVES FOR PROPULSION APPLICATIONS

Abstract

With ever-increasing concerns over environmental issues and limited natural resources associated with, there is a need of every ICE run car to be replaced by EV, piston engine or gas turbine in aircrafts to be replaced by electric motors. Electric Drives are gaining so much interest as the environmental concerns are rising day by day due to the emissions of ICE driven cars, kerosene/gasoline fueled aircrafts, boats, which is aiding to the climate change in negative way. The performance of the high speed electric drive based propulsion applications like EVs and electric aircrafts in terms of fuel efficiency and range is the biggest challenge today. This report outlines the major high speed applications where electric drive can be used to replace the current fuel based engine run propulsion systems, the converter topologies and the control technologies that are employed to run such drives. In this project, a highspeed Permanent Magnet Synchronous Motor is simulated in Vector Control Mode. First the Dynamic model of PMSM in synchronously rotating d-q reference frame is developed and then used for the purpose of vector control. The controllers for current and speed control loops are designed. The results are taken for all the four quadrants of operation, which are forward motoring, forward braking, reverse motoring and reverse braking. Moreover the steady state and dynamic performance of machine is compared for Asynchronous (AST) and Synchronized sine triangle (SST) PWM techniques in terms of THD in current waveform as well as the sub-harmonics present in the torque. Moreover, the thermal analysis is performed using IPOSIM online tool, for AST and SST PWM techniques respectively. Furthermore, four possible triangular carrier orientations are compared to find out the best orientation resulting in lowest harmonic distortion in motor current.