Field-Oriented Control for PMSM in Electric Vehicles Based on 7-level CHB Multilevel Inverter

Electric vehicles (EVs) are attractive nowadays by industry and researchers to reduce emissions. The type of inverter is one of the solutions used to improve the EVs performance and efficiency. Therefore, this study presents a cascaded H-bridge multilevel inverter (CHB MLI) of seven levels for EV drive systems where batteries provide isolated DC sources. Moreover, advantages such as higher efficiency, better waveform quality, and higher power density can be obtained. Thanks to its high-power density and compact size advantages, the permeant magnet synchronous motor (PMSM) is used. Further, field-oriented control (FOC) is used in this paper to control the rotating speed of the PMSM. The performance of the overall drive system is examined through simulation results using the parameter of the actual 12kW PMSM. Extensive simulation results have proved that the proposed CHB can lower THD compared to the conventional inverter.