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Five level high power motor drive converter and control system

  • US 6,058,031 A
  • Filed: 06/30/1998
  • Issued: 05/02/2000
  • Est. Priority Date: 10/23/1997
  • Status: Expired due to Term
First Claim
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1. A high power motor drive converter comprising:

  • three direct current busses;

    a five level hybrid neutral point clamped (NPC) output power conversion stage comprising three NPC phase bridges including switches and coupled in a wye configuration through a neutral point, the NPC output power conversion stage for supplying power to an AC drive motor, each NPC phase bridge receiving power on a respective one of the three direct current busses;

    three isolated split series-connected DC capacitor banks each coupled in parallel to a respective one of the three NPC phase bridges;

    a controller for selecting switch positions with active control of neutral voltages;

    a rectifier transformer with three sets of three phase secondaries, each set coupled in parallel to a respective one of the capacitor banks; and

    three diode rectifier source converter bridges each coupled in parallel to a respective one of the three sets of three phase secondaries.

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