NEUTRAL-TO-GROUND VOLTAGE MINIMIZATION IN A PWM-RECTIFIER INVERTER CONFIGURATION/

High frequency common mode voltage produced by power converters are a major cause of conducted EMI, creating motor ground currents, bearing currents and other harmful by-products. In this paper a control algori thm for an induction motor fed by a fully controlled rectifier and inv erter is developed to reduce the common mode neutral-to-ground voltage of the induction motor. A bearing current model is used to evaluate t he effects on the bearing currents of the double bridge modulation sch eme when the new algorithm and conventional algorithms are used. Simul ation results are shown to demonstrate the benefits of the new PWM app roach.