Marine propulsion systems

  • US 9,941,772 B2
  • Filed: 10/14/2010
  • Issued: 04/10/2018
  • Est. Priority Date: 10/14/2010
  • Status: Active Grant
First Claim
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1. A marine propulsion system including a plurality of propulsion drive trains, comprising:

  • first and second alternating current (AC) busbars;

    a plurality of first and second active front end (AFE) power converters having ac input terminals respectively connected to the first and second AC busbars;

    wherein ac output terminals of each of the first plurality of AFE power converters are respectively connected to AC output terminals of the second plurality of AFE power converters; and

    a plurality of propulsion motors, each having an AC terminal connected to the AC output terminals of a corresponding one of the plurality of first and second AFE power converters; and

    wherein each AFE power converter includes (i) a first active rectifier/inverter connected to the respective busbar via its AC input terminal and (ii) a second active rectifier/converter connected to the corresponding propulsion motor via its AC output terminal, DC terminals of the first and second active rectifier/inverters of each of the AFE power converters being coupled together;

    wherein the first and second active rectifier/inverters are configured for respective operation as a rectifier and an inverter simultaneously, the rectifier supplying power to the DC terminals, the inverter supplying power to at least one of the propulsion motors; and

    wherein a rating of the first and second active rectifier/inverters is adjustable to control an amount of the supplied power to the at least one propulsion motor in accordance with at least one of (i) a predetermined level and (ii) a ratio selected based upon required power during a fault condition.

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