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Transformerless photovoltaic grid-connecting inverting device and control method thereof

The present invention relates to a transformerless photovoltaic grid-connecting inverting device and an inverting control method thereof. The inverting device comprising a boosting unit, an inverting unit, a grid-connecting unit and a control unit. The boosting unit is connected to a solar cell, for boosting an output voltage of the solar cell and then outputting a direct voltage. The inverting unit is used to convert the direct voltage output by the boosting unit into an alternating voltage. The grid-connecting unit is connected between the inverting unit and an alternating power grid, and closes or breaks up the electrical connection between the inverting unit and the alternating power grid based on a control signal. The control unit is connected to the grid-connecting unit and the inverting unit, and determines a drive signal output to the inverting unit and a grid-connecting signal output to the grid-connecting unit based on the direct voltage and the alternating voltage and phase of the power grid, wherein the phase of the drive signal is synchronous with the phase of the alternating current in the power grid. Therefore, the present invention achieves an inverting device which has a low cost and increased efficiency and safety.
Owner:RENOVO POWER SYST WUXI
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