Multi-power-supply complementary power supply device and control method thereof

The invention provides a multi-power-supply complementary power supply device and a control method thereof. The multi-power-supply complementary power supply device comprises a photovoltaic power supply branch, a mains supply input branch, an inverter and a system controller; the photovoltaic power supply branch comprises a solar controller, an energy storage unit and a photovoltaic voltage adjusting circuit which are sequentially arranged from photovoltaic input; the mains supply input branch comprises a mains supply conversion circuit connected with the mains supply; the output end of the photovoltaic voltage adjusting circuit and the output end of a first voltage boosting/reducing DC-DC unit are connected in parallel to a DC bus of the inverter; a first acquisition circuit is arranged between the system controller and the photovoltaic power supply branch; a second acquisition circuit is arranged between the system controller and the mains supply input branch; and the control outputend of the system control