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A Four-Level Inversion Scheme for a 6n-Pole Open-End Winding Induction Motor Drive for an Improved DC-Link Utilization ABSTRACT: In this paper, a new power-circuit configuration for four-level inversion with an open-end winding induction motor is proposed. This configuration is suitable for an induction motor with 6n (n = 1, 2, . . .) Number of poles. Two isolated DC power supplies, each rated for one third of the total DC-link voltage, are sufficient to realize this four-level inverter scheme. It is shown that it is possible to produce a voltage vector of 1-p.u. Magnitude with a total deck-line voltage of 0.66 p.u., indicating that the DC-link utilization is enhanced by a factor of 33% with this power-circuit configuration. In the proposed power circuit, the zero-sequence current is arrested as the motor phase windings of the open-end winding induction motor are segmented into two separate groups in the ratio of 2: 1, with one end of each group forming an isolated neutral point. Each phase group is then powered by two individual two-level inverters with two separate DCpower supplies with a common negative rail. The existence of this common negative rail is the principal cause of an increased DC-bus utilization simple decoupled space-vector pulse width modulation is adequate to control both of these inverters, which further demonstrates the simplicity of the drive control. BLOCK DIAGRAM: 3 ph ac supply 3ph ac supply BRIDGE RECTIFIER AND FILTER INVERTER 1 OPEN END WINDING IM BRIDGE RECTIFIER AND FILTER DRIVE CIRCUIT DRIVE CIRCUIT STEP DOWN TRANSFORMER INVERTER 2 BRIDGE RECTIFIER AND VOLTAGE REGULATOR TOOLS AND SOFTWARE USED: MICROCONTROLLER MP LAB ORCAD/PSPICE MATLAB/SIMULINK OUTPUT: HARDWARE SIMULATION