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Multilevel inverter modulation method to reduce common-mode voltage and overvoltage at the motor terminals

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4 Author(s)
Naumanen, V. ; LUT Energy, Electr. Eng., Lappeenranta Univ. of Technol., Lappeenranta, Finland ; Korhonen, J. ; Luukko, J. ; Silventoinen, P.

Multilevel inverter topologies have been a widely researched topic, especially for high-power applications. Its more sinusoidal output voltage waveform is preferred over traditional two-level inverters. Common-mode voltages are known to cause motor bearing currents and to be a source for electromagnetic interference. Traditional multilevel modulation methods still produce common-mode voltage, and this can result in bearing failure. In this paper, a modulation method that reduces the common-mode voltage and mitigates the motor terminal voltage oscillation caused by long motor leads, is discussed. The method is compared with a traditional multilevel inverter modulation method and another common-mode voltage reducing method.

Published in:

Electrical and Electronics Engineers in Israel (IEEEI), 2010 IEEE 26th Convention of

Date of Conference:

17-20 Nov. 2010

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