Inverter synchronization
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United States of America Patent
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Aug 22, 2017
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app pub date -
Jun 10, 2014
filing date -
Jun 19, 2013
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Abstract
A method of initiating a grid-tied inverter is described, in which in-rush currents and DC overvoltage conditions are reduced or avoided. The method uses a pulse width modulator to drive the inverter under the control of a voltage feedforward signal such that the inverter output is dependent on the measured grid voltage. Then, an AC current feedback controller is enabled and the pulse width modulator is used to drive the inverter under the control of both the voltage feedforward control signal and the feedback control signal.
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