Carrier based power balancing in three-level open-end drive for electric vehicles

In this paper, an open-end induction motor, fed from dual two-level voltage source inverter (VSI), for battery electric vehicle (EV) drive is considered. A dual two-level inverter supplied from isolated battery packs is an attractive multilevel topology for electric transportation. Using pulse width modulation (PWM) techniques, it is possible to provide power balancing between the two isolated battery packs, thereby increasing the reliability of the multilevel dual two-level inverter topology. This paper introduces a modified carrier based modulation technique, for balancing the state of charge (SOC) of independent battery packs and to dynamically regulate the power flow from the two inverters, according to the drive requirement. The operation of the proposed scheme has been validated through simulation.