On influence of various modulation schemes on a PMSM within an electric Vehicle

A drive train system (DTS) powered by an ideal voltage source and driving a permanent magnet synchronous motor (PMSM) is discussed in this paper. A two-level, three-phase conventional inverter with no harmonic filters on both AC and DC sides is used as means of power conditioning. This DTS is modelled as a double oscillator according to a simplified drive train in an electric vehicle. Commonly used pulse width modulation (PWM) based, as well as bang-bang controller (BBC) based inverter modulation schemes are applied. The influence of these modulation schemes on the performance of the DTS is determined by assessing the level of inverter generated harmonics flowing to the electric source of the DTS. The simulated results presented in the paper indicate that the pulsing frequency can be reduced by means of the hysteresis controller and that with related dispersion of the harmonic energy of the inverter generated spectrum the absence of filters in the dc-link can be partly retained.