A Novel on Three Phase Matrix Converter Using Space Vector Modulation for Traction Motor Control

Abstract

This paper presents the Space Vector Modulation (SVM) control of Matrix converter for high rated three phase induction motors (traction motor) speed control which requires the high starting torque characteristics and also approximately zero steady-state speed deviations at any desired frequency. Power Electronic and drive motion control have emerged as an essential technology in the industrial revolution and automation. Most of the industrial drive practices are of constant torque type and needs to drive such loads at different speeds. Hence, generation of the supply with Variable Voltage Variable Frequency (VVVF) is essential to maintain the stator side flux magnitude as constant. The constant Voltage per frequency (V/f) method (or) popularly known as Volts per hertz method by SVM Control of Matrix Converter (MC) in used as control scheme to achieve a better controlling over the conventional AC-DC-AC drive for VVVF. This proposed scheme gives the complete compensation for Current-Resistance i.e., voltage drop $(\mathbf{I}^{*}\mathbf{R})$, by vectorially adjusting the stator side voltages of Traction motor drive and keeping the magnitude of the stator side flux almost constant irrespective of changes in frequency or even for variation of load. The results presented in the paper for proposed method shows that the motor speed of the traction motor can be controlled accurately almost with almost zero equilibrium state / null study state error and reducing frequency to at least 7.1 Hz. The results clearly illustrate the starting torque of Traction Motor Drive more than 2.5 times rated value for 215 HP (160 kW) induction motor drive. Modeling and design of the proposed MC converter implemented in MATLAB/Simulink environment.