Multilevel inverter application for railway traction motor control

Abstract

This paper will present why choosing a 7-level reverse voltage source fed to three-phase induction motors to the railway traction motor. In addition, this paper shows the implementation of space vector pulse width modulation (SVPWM) and the math model of induction motor, stator currents, and speed controller design of electric traction drive system based on field-oriented control (FOC). By MATLAB/Simulink method, this multi-level inverter in FOC structure reduces total harmonic distortion (THD) more than other multi-level inverters such as 3 and 5-level inverter. Furthermore, this FOC control structure combined with 7-level inverter improved speed and torque responses required for railway traction motor load.

Red deer algorithm-based selective harmonic elimination technique for multilevel inverters

“…However, this technology faces a harmonic problem that causes harmful effects on the load. Among harmonics, the most dangerous harmonics for the system are low-order harmonics because these harmonics cause torque fluctuations in electric motors, decrease efficiency, and reduce the lifetime of the system [9]- [12]. The control and modulation methods used by these inverters have become more challenging as MLI topologies have advanced [12]- [14].…”

“…Among harmonics, the most dangerous harmonics for the system are low-order harmonics because these harmonics cause torque fluctuations in electric motors, decrease efficiency, and reduce the lifetime of the system [9]- [12]. The control and modulation methods used by these inverters have become more challenging as MLI topologies have advanced [12]- [14]. An essential issue that needs to be resolved is the existence of low-order dominant harmonics in the cascading output voltage generated by MLI.…”

Sliding mode control of a PMSM railway traction drive fed by multi-level inverter

“…Nowadays, permanent magnet synchronous motors (PMSMs) are often utilized in electric vehicles and railway traction drives (RTDs) [1]- [3]. According to Ha et al [4], Kuntanapreeda [5] study, this motor generates torque to extend the operating speed range. Moreover, it has features compatible with vehicle transmission's mechanical aspects, such as regenerative braking.…”