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Frequency converter

  • US 8,587,141 B2
  • Filed: 11/24/2009
  • Issued: 11/19/2013
  • Est. Priority Date: 11/24/2008
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a variable speed turbine that comprises at least one turbine blade connected to a rotating hub;

    a multi pole synchronous generator driven by said rotating;

    a multi level frequency converter connected to said multi pole synchronous generator via a plurality of galvanic isolated three phase cable, wherein the multi pole synchronous generator is arranged to feed current to the multi level frequency converter through the plurality of galvanic isolated three-phase cables and wherein the multi level frequency converter comprises a plurality of elements arranged in columns and coupled in cascading order to add inverted voltage; and

    a transformer connected to the multi level frequency converter and arranged to transform the added inverted voltage to a power grid level connected to a secondary side of the transformer, wherein the multi pole synchronous generator has at least 12 poles and galvanically isolated stator windings connected via the plurality of galvanic isolated three-phase cables to a multi level rectifier topology feeding an intermediate DC-voltage level as suited to interface an inverter of the multi level frequency converter feeding power out through the transformer.

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