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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

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  DC-power  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.

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