Two-level three-phase voltage source inverter fed low-power AC induction motor based on unipolar pulse-width modulation method

Kai Chen; Shi-ming Ji; Li Zhang

Two-level three-phase voltage source inverter fed low-power AC induction motor based on unipolar pulse-width modulation method

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Author(s): Kai Chen ¹ ; Shi-ming Ji ² ; Li Zhang ²
- Affiliations: 1: Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Zhejiang University of Technology, Ministry of Education, Hangzhou 310032, People's Republic of China ;
  2: College of Mechanical Engineering, Zhe-jiang University of Technology, No.18 Chao-wang Road, Hang-zhou 310014, People's Republic of China
Source: Volume 9, Issue 3, 09 March 2016, p. 435 – 440
DOI: 10.1049/iet-pel.2015.0231 , Print ISSN 1755-4535, Online ISSN 1755-4543

Received 13/04/2015, Accepted 22/07/2015, Revised 30/06/2015, Published 09/03/2016

Space vector modulation is a well-established theory. Generally, a three-phase voltage source inverter generates eight switching states, including six active and two zero states, by the bipolar method. This study proposes a novel way to synthesise the output voltage vector by turning off both switches in a leg. Accordingly, new leg switching states are defined. A unipolar method is used to achieve discontinuous pulse-width modulation. The complex reference vector is located by one active vector and two newly defined leg switching states. The most notable features of the proposed method are that it completely overcomes the problem of dead time without current polarity detection. These features make it very attractive for low-cost, low-power constant volts per hertz (V/f), open-loop, three-phase AC induction motor applications.

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Two-level three-phase voltage source inverter fed low-power AC induction motor based on unipolar pulse-width modulation method

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