Modelling of an integrated grid-connected three-phase current source unidirectional buck battery charger for electric traction application

The difficulty of accessing controlled fast battery charging station in some geographical areas for electric vehicles necessitates one of the ideas of integrated motor drive and battery charging unit. To integrate the charger into the traction motor, one of the stator windings of the split-phase interior permanent magnet synchronous motor is connected to three-phase utility supply while the second stator winding feeds the extra-provided power electronic charger circuit. To this end, a unique complex q-d analytical equational control is used to realise the pulse width modulation (PWM) instead of the traditional PWM method. Current source control technique is employed in the charger control structure in lieu of voltage source converter (VSC) control topology. The reduction in grid line current harmonic distortion is 69.6% compared to VSC topology. Transfer function is developed to calculate the current and voltage control system proportional integral parameters. MATLAB study confirms the efficacy of the configuration.