An 18-Pulse Converter and 4-Level Cascaded Inverter Based Induction Motor Drive

Here, 18-pulse rectification system is presented to supply clean power to medium voltage drives used in applications such as oil and gas production. High pulse rectification systems are demanded by industry to satisfy international power quality standards like the IEEE-519. A cascaded multilevel inverter is used here, which is cascading three –phase voltage source inverter (VSI) in unique manner. The presented four –level inverter has three 2-level VSI in cascaded arrangement. This induction motor drive (IMD) system is compact in size as it requires less number DC voltage sources, thus making it reliable. A Simulink model is built to analysis the performance of an indirect field-oriented control (IFOC) technique based 30kW IMD. Therefore, to validate the Simulink result a 7.5kW induction motor (IM) experimental setup control by a DSP (dSPACE DS1006) controller. A comprehensive study shows a superior power quality performance both at grid and drive end of the system.