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Four-level inversion is realised by connecting two two-level inverters, fed from both ends of open-end winding induction motor with Asymmetrical DC link voltages in the ratio of 2:1. This inverter scheme produces 64 space-vector combinations distributed over 37 space-vector locations. All the switching combinations are not helpful to achieve four level inversion, some of the combinations overcharge...
A Space Vector based PWM scheme for 4-level inverter is proposed. 4-level inversion is achieved by connecting two 2-level inverters in open-end winding configuration. The individual inverters are fed with asymmetric DC link voltages. The proposed scheme does not use sector identification method to find the sub hexagon, which encloses the tip of the reference space vector. During 3-level operation,...
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