Power conversion system and power update control method

A power update control method applied to a power conversion system, the power conversion system comprises N power conversion units, N is an integer and N≥2, a first terminal of each power conversion unit is configured to connect to a direct current power supply or an alternating current power supply, a second terminal of each power conversion unit is configured to connect to a load, an energy storage unit, or a power grid, and the power conversion unit is configured to:

• perform conversion on a direct current input by the direct current power supply or an alternating current input by the alternating current power supply, and
• then output a current obtained through the conversion;
• and
• the power update control method comprises:
• controlling operating modes of one or more target power conversion units in the N power conversion units to be switched between a power reserve PR mode and a maximum power point tracking MPPT mode;
• and
• updating a reference power based on a maximum power obtained in the MPPT mode, for an operating power of the target power conversion unit obtained after switching from the MPPT mode to the PR mode to be an updated reference power, wherein the updated reference power is less than or equal to the maximum power;
• and
• controlling an operating mode of a power conversion unit other than the target power conversion unit in the N power conversion units to remain unchanged.