Reddy, B Prathap and K, Siva Kumar and Iqbal, Atif
(2020)
Phase Reconfiguring Technique for Enhancing the Modulation Index of Multilevel Inverter fed 9-Phase IM Drive.
IEEE Transactions on Industrial Electronics.
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Abstract
In this paper, a multilevel inverter (MLI) scheme is proposed for 4-pole 9-phase induction motor (IM) drives with improved DC bus utilization as well as reduced device count. The proposed MLI is realized with nine 3-switch inverter legs (3-SIL) and a single DC source. In the proposed MLI, each 3-SIL is utilized for exciting the two identical voltage profile coils (IVPC)/phase of the 4-pole stator winding, which means each leg has to be modulated with two references. This 2 independent references/leg will limit the modulation index (M.I) of 3-SIL based proposed MLI. This lower M.I will result in a requirement of the higher magnitude of DC link voltage to achieve the rated load voltage requirement. In this paper, an effective phase grouping concept is proposed for reducing the DC link voltage requirement of the proposed MLI. In addition, all the possibilities of phase grouping details for proposed MLI fed 9-phase IM drive are also presented. The proposed MLI fed 5 hp 9-phase 4-pole IM drive is validated by using Ansys Maxwell FEM simulation and Experimental prototype for entire modulation range.
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