Discontinuous decoupled SVPWM schemes for a four-level open-end winding induction motor drive with waveform symmetries

Suresh Lakhimsetty; V.T. Somasekhar

Discontinuous decoupled SVPWM schemes for a four-level open-end winding induction motor drive with waveform symmetries

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Author(s): Suresh Lakhimsetty¹ and V.T. Somasekhar¹
- Affiliations: 1: Department of Electrical Engineering , National Institute of Technology Warangal , Warangal , India
Source: Volume 11, Issue 2, 20 February 2018, p. 280 – 292
DOI: 10.1049/iet-pel.2017.0096 , Print ISSN 1755-4535, Online ISSN 1755-4543

Received 24/02/2017, Accepted 13/09/2017, Revised 17/08/2017, Published 14/09/2017

A four-level open-end winding induction motor drive (OEWIMD) is realised by feeding the open stator windings of a three-phase induction motor from either end with two-level voltage source inverters (VSIs). These VSIs are operated with unequal DC-link voltages, which are in the ratio of 2:1. This circuit configuration has the disadvantage of overcharging the DC-link capacitor of the inverter operated with the lower input voltage. Decoupled space vector pulse-width modulation (DSVPWM) schemes, which were suggested in the previous literature to circumvent this problem, result in higher switching power loss in the dual-inverter topology. It is known that the discontinuous pulse-width modulation (PWM) schemes reduce the switching power loss. However, lack of structural symmetry of the power circuit renders it unwieldy to devise these PWM schemes. This study explores the applicability of discontinuous decoupled SVPWM (DDPWM) techniques for the four-level OEWIMD, without compromising on the waveform symmetries. With the aid of an improvised loss model, it is shown that these PWM schemes achieve the reduction of the overall loss of the four-level OEWIMD compared to the DSVPWM schemes. It has also been observed that one of the proposed DDPWM schemes result in reduced dv⁄dt in the motor phase voltages.

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Discontinuous decoupled SVPWM schemes for a four-level open-end winding induction motor drive with waveform symmetries

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