A new modular motor-modular inverter (MM-MI) concept for medium voltage adjustable speed drive systems

摘要

In this paper a new modular motor - modular inverter (MM-MI) concept for medium voltage adjustable speed drive (MV-ASD) systems is introduced. It is shown that a standard medium voltage motor winding connections can be reconnected into severalthree-phase groups, each powered by a separate three-phase PWM inverter, resulting in a high performance MV-ASD system. The proposed approach is fault tolerant and can continue to operate at reduced power levels, under inverter and/or motor faults. Anexample 250Hp, 4 pole, 60Hz, 2300V/4160V motor winding connection diagram along with the associated inverter configurations is analyzed. Results from analysis are presented on the aspects of faults and motor operation under partial winding excitation.Experimental results on a low voltage (460V), 10hp ASD are demonstrated.