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Modelling and analysis of an open-loop induction motor drive incorporating the effect of inverter dead-time

Sadhana volume 41, pages 125–145 (2016)Cite this article

Abstract

The objective of this paper is to study the influence of inverter dead-time on steady as well as dynamic operation of an open-loop induction motor drive fed from a voltage source inverter (VSI). Towards this goal, this paper presents a systematic derivation of a dynamic model for an inverter-fed induction motor, incorporating the effect of inverter dead-time, in the synchronously revolving dq reference frame. Simulation results based on this dynamic model bring out the impact of inverter dead-time on both the transient response and steady-state operation of the motor drive. For the purpose of steady-state analysis, the dynamic model of the motor drive is used to derive a steady-state model, which is found to be non-linear. The steady-state model shows that the impact of dead-time can be seen as an additional resistance in the stator circuit, whose value depends on the stator current. Towards precise evaluation of this dead-time equivalent resistance, an analytical expression is proposed for the same in terms of inverter dead-time, switching frequency, modulation index and load impedance. The notion of dead-time equivalent resistance is shown to simplify the solution of the non-linear steady-state model. The analytically evaluated steady-state solutions are validated through numerical simulations and experiments.

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Authors and Affiliations

  1. Department of Electrical Engineering, Indian Institute of Science, Bengaluru, 560 012, India

    ANIRUDH GUHA & G NARAYANAN

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  1. ANIRUDH GUHA
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  2. G NARAYANAN
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Correspondence to ANIRUDH GUHA.

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GUHA, A., NARAYANAN, G. Modelling and analysis of an open-loop induction motor drive incorporating the effect of inverter dead-time. Sadhana 41, 125–145 (2016). https://doi.org/10.1007/s12046-015-0444-9

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  • DOI: https://doi.org/10.1007/s12046-015-0444-9

Keywords

  • Dead-time
  • dynamic model of induction motor
  • induction motor drive
  • voltage source inverter
  • space vector
  • synchronous reference frame
  • variable speed drive