CPC H02S 40/32 (2014.12) [H02J 3/12 (2013.01); H02J 13/0001 (2020.01)] | 18 Claims |
1. A method for component voltage limitation, applied in a photovoltaic power generation system comprising an inverter, comprising:
receiving an instruction for enabling voltage limitation or an instruction for suspending voltage limitation, wherein the instruction for enabling voltage limitation is received before the inverter is connected to a grid, and the instruction for suspending voltage limitation is received after the inverter is connected to the grid;
controlling at least one photovoltaic cell in a photovoltaic-cell string to operate in a voltage-limited mode, in response to receiving the instruction for enabling voltage limitation, wherein the photovoltaic-cell string comprises a plurality of photovoltaic cells connected in series, and each of the plurality of photovoltaic cells is a photovoltaic-cell sheet, or a photovoltaic sub-string; and
controlling a photovoltaic cell operating in the voltage-limited mode to resume a normal output, in response to receiving the instruction for suspending voltage limitation;
wherein the voltage-limited mode includes a chopping mode, and in the chopping mode, an output voltage of the at least one photovoltaic cell in the photovoltaic-cell string is controlled based on pulse width modulation (PWM) to ensure that an output of a corresponding photovoltaic cell is controlled with a certain duty ratio.
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