METHOD FOR SMOOTHING ALTERNATING ELECTRIC CURRENT FROM A NUMBER OF POWER GENERATING UNITS AND WIND POWER PLANT INCLUDING A NUMBER OF WIND MILLS WITH VARIABLE ROTATIONAL SPEED
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Abstract
A method and a wind power plant are provided for smoothing alternating electric current from a number of power generators. Generators are electrically connected to an electric network. Each power generator includes a transformer with pulse width modulation for converting direct current to pulse width modulated alternating current for feeding to the network. The time for feeding the pulses of the pulse width modulated alternating current is different for each generator in order to achieve a more even alternating current as a sum of respective outputs of alternating current from the generators.
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Citations
26 Claims
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1-11. -11. (canceled)
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12. A method for smoothing alternating electric current from a plurality of power generating units, where the power generating units are electrically connected to an electric network, comprising:
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converting direct current to pulse width modulated alternating current for feeding to the network, the conversion by a transformer with pulse width modulation and which is included in each power generating unit, wherein times for feeding pulses of the pulse width modulated alternating current are different for respective power generating units in order to achieve a more even alternating current as a sum of respective outputs of alternating current from the power generating units. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A wind power plant, comprising:
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a plurality of windmills having variable rotational speed, the windmills connected to an electric network, and each windmill includes; a generator for producing an electric current, a converter for pulse width modulated conversion of direct current to pulse width modulated alternating current for feeding to the network, and a time controller determines a time for feeding the pulses of the pulse width modulated alternating current, wherein the time controllers are programmed for feeding the pulses from the each windmill at different times in order to achieve a more even alternating current. - View Dependent Claims (25, 26)
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Specification