Photovoltaic power generation system and synchronous frequency conversion method

The invention provides a photovoltaic power generation system and a synchronous frequency conversion method, a communication controller is used for receiving at least one expected switching frequency sent by a plurality of inverters and issuing a target switching frequency switching command to the plurality of inverters, and the target switching frequency switching command comprises a target switching frequency; the target switching frequency is any value greater than or equal to the maximum value in the lower limit of the switching frequency in the expected switching frequency; the multiple inverters are controlled to synchronously switch the switching frequencies of the multiple inverters to the target switching frequency at the switching time, and the power grid phase angle corresponding to the switching time lags behind the power grid phase angle of the multiple inverters receiving the target switching frequency switching command, so that the circulating current among the inverters can be reduced to a cer