Method and apparatus for decoupling the power of grid-connected inverter
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United States of America Patent
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Feb 6, 2018
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Nov 23, 2016
filing date -
Nov 27, 2015
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Abstract
A method and an apparatus for decoupling output power of an inverter are provided. The method comprises: obtaining voltage amplitude instruction E* and voltage phase instruction θ* according to an output voltage and an output current of the inverter; obtaining an amplitude feedforward amount Eff and a phase feedforward amount δff according to an amplitude U of a grid voltage of the power grid, an amplitude E of the output voltage of the inverter, and a phase difference δ between the output voltage of the inverter[0] and the grid voltage; obtaining a reference voltage amplitude Eref according to the voltage amplitude instruction E* and the amplitude feedforward amount Eff, and obtaining a reference voltage phase θref according to the voltage phase instruction θ* and the phase feedforward amount δff; and regulating the output power of the inverter using the reference voltage amplitude Eref and the reference voltage phase θref.
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