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Simulation of an Electric Drive with an Induction Motor in Emergency and Abnormal Modes of a Frequency Converter

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Abstract

Block diagrams of a two-level inverter and three-level inverter with clamping diodes are presented, and their operational principles and sequence of output voltage formation are analyzed. Typical faults of frequency converters are analyzed, and it is demonstrated that most emergency and abnormal modes are related with a short circuit of inverter isolated transistor or the absence of control pulses on its gate. The influence of these faults on dynamics of an electric drive are studied. Simulation results are presented for electric drives with the considered types of independent voltage converters. It has been established that, upon decay of control pulses at the transistor gate, the transient processes in inverters with various topologies actually do not differ qualitatively and quantitatively. A short circuit of an isolated transistor in the three-level inverter has less negative consequences than does the two-level inverter: the maximum current in transient process is nearly four times lower, and the maximum moment is about 2.5 times lower.

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Authors and Affiliations

  1. Bryansk State Technical University, 241035, Bryansk, Russia

    A. A. Pugachev & S. V. Morozov

  2. Emperor Alexander I State Transport University, 190031, St. Petersburg, Russia

    A. V. Tretyakov & I. P. Vikulov

Authors
  1. A. A. Pugachev
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  2. S. V. Morozov
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  3. A. V. Tretyakov
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  4. I. P. Vikulov
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Correspondence to A. A. Pugachev.

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In the three-level inverter of a frequency converter of an electric drive with an induction motor, due to the higher number of semiconductor switches, a short circuit of an isolated transistor leads to less negative consequences in comparison with the two-level inverter. The maximum current in transient process is nearly four times lower, and the maximum moment is about 2.5 times lower; upon decay of control pulses at the transistor gate, the transient processes in inverters with various topologies actually do not differ.

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Translated by I. Moshkin

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Pugachev, A.A., Morozov, S.V., Tretyakov, A.V. et al. Simulation of an Electric Drive with an Induction Motor in Emergency and Abnormal Modes of a Frequency Converter. Russ. Electr. Engin. 93, 98–103 (2022). https://doi.org/10.3103/S1068371222020122

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  • DOI: https://doi.org/10.3103/S1068371222020122

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