Frequency converter
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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Abstract
The inventions relates to a system for conditioning of power from a turbine, the turbine comprising at least one turbine blade (1) connected to a rotating hub (2), the rotating hub (2) is arranged to drive a generator (5). The generator is a multi pole synchronous generator (5) connected via a plurality of galvanic isolated three-phase cables (11) to a multi level frequency converter (25), the generator (5) also being arranged to feed current to the frequency converter (25) through the three-phase cables (11). The multi level frequency converter (25) is constituted by a plurality of elements arranged in columns and coupled in cascading order to add inverted voltage.
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Citations
20 Claims
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1. A system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for conditioning power, the method comprising:
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driving a multi pole synchronous generator with a variable speed turbine, wherein the multi pole synchronous generator has at least 12 poles and galvanically isolated stator windings; feeding current from said multi pole synchronous generator to a multi level frequency converter through a plurality of galvanic isolated three-phase cables, wherein the multi level frequency converter comprises a plurality of elements arranged in columns and coupled in cascading order to add inverted voltage; and feeding an intermediate DC-voltage level as suited to interface an inverter of the multi level frequency converter; and transferring said inverted voltage received by a transformer connected to the multi level frequency converter to a power grid level connected to a secondary side of the transformer. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification