Traction system for an EV based on induction motor and 3-level NPC inverter multilevel converters

This work presents the modeling of the dynamics of an electric vehicle (EV). Then, by using a typical driving cycle, the parameters for the motor drive system and other drive train components are determined. The proposed drive system is based on an induction motor being supplied by a 3-level NPC inverter. The speed control is based on a constant V/Hz strategy while the inverter is commanded by a Sinusoidal Pulse Width Modulation Strategy. The proposed drive system is validated by simulation. In one hand, the results show that the implemented V/Hz control strategy is capable of maintain the reference speed, as demanded by a driving pattern, and on the other hand, the strategy used to control de NPC multilevel inverter, is capable of assuring the demanded output voltage and the inverter internal variables are kept as needed.